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; 79 static u_int32_t disksecs; 80 81 struct mboot { 82 unsigned char *bootinst; /* boot code */ 83 off_t bootinst_size; 84 struct dos_partition parts[NDOSPART]; 85 }; 86 87 static struct mboot mboot; 88 static int fd; 89 90 #define ACTIVE 0x80 91 92 static uint dos_cyls; 93 static uint dos_heads; 94 static uint dos_sectors; 95 static uint dos_cylsecs; 96 97 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 98 #define DOSCYL(c) (c & 0xff) 99 100 #define MAX_ARGS 10 101 102 static int current_line_number; 103 104 static int geom_processed = 0; 105 static int part_processed = 0; 106 static int active_processed = 0; 107 108 typedef struct cmd { 109 char cmd; 110 int n_args; 111 struct arg { 112 char argtype; 113 unsigned long arg_val; 114 char * arg_str; 115 } args[MAX_ARGS]; 116 } CMD; 117 118 static int B_flag = 0; /* replace boot code */ 119 static int I_flag = 0; /* use entire disk for FreeBSD */ 120 static int a_flag = 0; /* set active partition */ 121 static char *b_flag = NULL; /* path to boot code */ 122 static int i_flag = 0; /* replace partition data */ 123 static int q_flag = 0; /* Be quiet */ 124 static int u_flag = 0; /* update partition data */ 125 static int s_flag = 0; /* Print a summary and exit */ 126 static int t_flag = 0; /* test only */ 127 static char *f_flag = NULL; /* Read config info from file */ 128 static int v_flag = 0; /* Be verbose */ 129 static int print_config_flag = 0; 130 131 /* 132 * A list of partition types, probably outdated. 133 */ 134 static const char *const part_types[256] = { 135 [0x00] = "unused", 136 [0x01] = "Primary DOS with 12 bit FAT", 137 [0x02] = "XENIX / file system", 138 [0x03] = "XENIX /usr file system", 139 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)", 140 [0x05] = "Extended DOS", 141 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)", 142 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX", 143 [0x08] = "AIX file system or SplitDrive", 144 [0x09] = "AIX boot partition or Coherent", 145 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap", 146 [0x0B] = "DOS or Windows 95 with 32 bit FAT", 147 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)", 148 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)", 149 [0x0F] = "Extended DOS (LBA)", 150 [0x10] = "OPUS", 151 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT", 152 [0x12] = "Compaq diagnostics", 153 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)", 154 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)", 155 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)", 156 [0x18] = "AST Windows swapfile", 157 [0x1b] = "ASUS Recovery partition (NTFS)", 158 [0x24] = "NEC DOS", 159 [0x3C] = "PartitionMagic recovery", 160 [0x39] = "plan9", 161 [0x40] = "VENIX 286", 162 [0x41] = "Linux/MINIX (sharing disk with DRDOS)", 163 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)", 164 [0x43] = "Linux native (sharing disk with DRDOS)", 165 [0x4D] = "QNX 4.2 Primary", 166 [0x4E] = "QNX 4.2 Secondary", 167 [0x4F] = "QNX 4.2 Tertiary", 168 [0x50] = "DM (disk manager)", 169 [0x51] = "DM6 Aux1 (or Novell)", 170 [0x52] = "CP/M or Microport SysV/AT", 171 [0x53] = "DM6 Aux3", 172 [0x54] = "DM6", 173 [0x55] = "EZ-Drive (disk manager)", 174 [0x56] = "Golden Bow (disk manager)", 175 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */ 176 [0x61] = "SpeedStor", 177 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach", 178 [0x64] = "Novell Netware/286 2.xx", 179 [0x65] = "Novell Netware/386 3.xx", 180 [0x70] = "DiskSecure Multi-Boot", 181 [0x75] = "PCIX", 182 [0x77] = "QNX4.x", 183 [0x78] = "QNX4.x 2nd part", 184 [0x79] = "QNX4.x 3rd part", 185 [0x80] = "Minix until 1.4a", 186 [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager", 187 [0x82] = "Linux swap or Solaris x86", 188 [0x83] = "Linux native", 189 [0x84] = "OS/2 hidden C: drive", 190 [0x85] = "Linux extended", 191 [0x86] = "NTFS volume set??", 192 [0x87] = "NTFS volume set??", 193 [0x93] = "Amoeba file system", 194 [0x94] = "Amoeba bad block table", 195 [0x9F] = "BSD/OS", 196 [0xA0] = "Suspend to Disk", 197 [0xA5] = "FreeBSD/NetBSD/386BSD", 198 [0xA6] = "OpenBSD", 199 [0xA7] = "NeXTSTEP", 200 [0xA9] = "NetBSD", 201 [0xAC] = "IBM JFS", 202 [0xAF] = "HFS+", 203 [0xB7] = "BSDI BSD/386 file system", 204 [0xB8] = "BSDI BSD/386 swap", 205 [0xBE] = "Solaris x86 boot", 206 [0xBF] = "Solaris x86 (new)", 207 [0xC1] = "DRDOS/sec with 12-bit FAT", 208 [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)", 209 [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)", 210 [0xC7] = "Syrinx", 211 [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS", 212 [0xDE] = "DELL Utilities - FAT filesystem", 213 [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition", 214 [0xE3] = "DOS R/O or SpeedStor", 215 [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.", 216 [0xEB] = "BeOS file system", 217 [0xEE] = "EFI GPT", 218 [0xEF] = "EFI System Partition", 219 [0xF1] = "SpeedStor", 220 [0xF2] = "DOS 3.3+ Secondary", 221 [0xF4] = "SpeedStor large partition", 222 [0xFB] = "VMware VMFS", 223 [0xFE] = "SpeedStor >1024 cyl. or LANstep", 224 [0xFF] = "Xenix bad blocks table", 225 }; 226 227 static const char * 228 get_type(int t) 229 { 230 const char *ret; 231 232 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL; 233 return ret ? ret : "unknown"; 234 } 235 236 237 static int geom_class_available(const char *); 238 static void print_s0(void); 239 static void print_part(const struct dos_partition *); 240 static void init_sector0(unsigned long start); 241 static void init_boot(void); 242 static void change_part(int i); 243 static void print_params(void); 244 static void change_active(int which); 245 static void change_code(void); 246 static void get_params_to_use(void); 247 static char *get_rootdisk(void); 248 static void dos(struct dos_partition *partp); 249 static int open_disk(int flag); 250 static ssize_t read_disk(off_t sector, void *buf); 251 static int write_disk(off_t sector, void *buf); 252 static int get_params(void); 253 static int read_s0(void); 254 static int write_s0(void); 255 static int ok(const char *str); 256 static int decimal(const char *str, int *num, int deflt, uint32_t maxval); 257 static int read_config(char *config_file); 258 static void reset_boot(void); 259 static int sanitize_partition(struct dos_partition *); 260 static void usage(void); 261 262 int 263 main(int argc, char *argv[]) 264 { 265 int c, i; 266 int partition = -1; 267 struct dos_partition *partp; 268 269 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 270 switch (c) { 271 case 'B': 272 B_flag = 1; 273 break; 274 case 'I': 275 I_flag = 1; 276 break; 277 case 'a': 278 a_flag = 1; 279 break; 280 case 'b': 281 b_flag = optarg; 282 break; 283 case 'f': 284 f_flag = optarg; 285 break; 286 case 'i': 287 i_flag = 1; 288 break; 289 case 'p': 290 print_config_flag = 1; 291 break; 292 case 'q': 293 q_flag = 1; 294 break; 295 case 's': 296 s_flag = 1; 297 break; 298 case 't': 299 t_flag = 1; 300 break; 301 case 'u': 302 u_flag = 1; 303 break; 304 case 'v': 305 v_flag = 1; 306 break; 307 case '1': 308 case '2': 309 case '3': 310 case '4': 311 partition = c - '0'; 312 break; 313 default: 314 usage(); 315 } 316 if (f_flag || i_flag) 317 u_flag = 1; 318 if (t_flag) 319 v_flag = 1; 320 argc -= optind; 321 argv += optind; 322 323 if (argc == 0) { 324 disk = get_rootdisk(); 325 } else { 326 disk = g_device_path(argv[0]); 327 if (disk == NULL) 328 err(1, "unable to get correct path for %s", argv[0]); 329 } 330 if (open_disk(u_flag) < 0) 331 err(1, "cannot open disk %s", disk); 332 333 /* (abu)use mboot.bootinst to probe for the sector size */ 334 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 335 err(1, "cannot allocate buffer to determine disk sector size"); 336 if (read_disk(0, mboot.bootinst) == -1) 337 errx(1, "could not detect sector size"); 338 free(mboot.bootinst); 339 mboot.bootinst = NULL; 340 341 if (print_config_flag) { 342 if (read_s0()) 343 err(1, "read_s0"); 344 345 printf("# %s\n", disk); 346 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 347 348 for (i = 0; i < NDOSPART; i++) { 349 partp = &mboot.parts[i]; 350 351 if (partp->dp_start == 0 && partp->dp_size == 0) 352 continue; 353 354 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 355 (u_long)partp->dp_start, (u_long)partp->dp_size); 356 357 /* Fill flags for the partition. */ 358 if (partp->dp_flag & 0x80) 359 printf("a %d\n", i + 1); 360 } 361 exit(0); 362 } 363 if (s_flag) { 364 if (read_s0()) 365 err(1, "read_s0"); 366 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 367 dos_sectors); 368 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 369 for (i = 0; i < NDOSPART; i++) { 370 partp = &mboot.parts[i]; 371 if (partp->dp_start == 0 && partp->dp_size == 0) 372 continue; 373 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 374 (u_long) partp->dp_start, 375 (u_long) partp->dp_size, partp->dp_typ, 376 partp->dp_flag); 377 } 378 exit(0); 379 } 380 381 printf("******* Working on device %s *******\n",disk); 382 383 if (I_flag) { 384 read_s0(); 385 reset_boot(); 386 partp = &mboot.parts[0]; 387 partp->dp_typ = DOSPTYP_386BSD; 388 partp->dp_flag = ACTIVE; 389 partp->dp_start = dos_sectors; 390 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 391 dos_sectors; 392 dos(partp); 393 if (v_flag) 394 print_s0(); 395 if (!t_flag) 396 write_s0(); 397 exit(0); 398 } 399 if (f_flag) { 400 if (read_s0() || i_flag) 401 reset_boot(); 402 if (!read_config(f_flag)) 403 exit(1); 404 if (v_flag) 405 print_s0(); 406 if (!t_flag) 407 write_s0(); 408 } else { 409 if(u_flag) 410 get_params_to_use(); 411 else 412 print_params(); 413 414 if (read_s0()) 415 init_sector0(dos_sectors); 416 417 printf("Media sector size is %d\n", secsize); 418 printf("Warning: BIOS sector numbering starts with sector 1\n"); 419 printf("Information from DOS bootblock is:\n"); 420 if (partition == -1) 421 for (i = 1; i <= NDOSPART; i++) 422 change_part(i); 423 else 424 change_part(partition); 425 426 if (u_flag || a_flag) 427 change_active(partition); 428 429 if (B_flag) 430 change_code(); 431 432 if (u_flag || a_flag || B_flag) { 433 if (!t_flag) { 434 printf("\nWe haven't changed the partition table yet. "); 435 printf("This is your last chance.\n"); 436 } 437 print_s0(); 438 if (!t_flag) { 439 if (ok("Should we write new partition table?")) 440 write_s0(); 441 } else { 442 printf("\n-t flag specified -- partition table not written.\n"); 443 } 444 } 445 } 446 447 exit(0); 448 } 449 450 static void 451 usage() 452 { 453 fprintf(stderr, "%s%s", 454 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 455 " fdisk -f configfile [-itv] [disk]\n"); 456 exit(1); 457 } 458 459 static void 460 print_s0(void) 461 { 462 int i; 463 464 print_params(); 465 printf("Information from DOS bootblock is:\n"); 466 for (i = 1; i <= NDOSPART; i++) { 467 printf("%d: ", i); 468 print_part(&mboot.parts[i - 1]); 469 } 470 } 471 472 static struct dos_partition mtpart; 473 474 static void 475 print_part(const struct dos_partition *partp) 476 { 477 u_int64_t part_mb; 478 479 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 480 printf("<UNUSED>\n"); 481 return; 482 } 483 /* 484 * Be careful not to overflow. 485 */ 486 part_mb = partp->dp_size; 487 part_mb *= secsize; 488 part_mb /= (1024 * 1024); 489 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 490 get_type(partp->dp_typ)); 491 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 492 (u_long)partp->dp_start, 493 (u_long)partp->dp_size, 494 (uintmax_t)part_mb, 495 partp->dp_flag, 496 partp->dp_flag == ACTIVE ? " (active)" : ""); 497 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 498 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 499 ,partp->dp_shd 500 ,DPSECT(partp->dp_ssect) 501 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 502 ,partp->dp_ehd 503 ,DPSECT(partp->dp_esect)); 504 } 505 506 507 static void 508 init_boot(void) 509 { 510 #ifndef __ia64__ 511 const char *fname; 512 int fdesc, n; 513 struct stat sb; 514 515 fname = b_flag ? b_flag : "/boot/mbr"; 516 if ((fdesc = open(fname, O_RDONLY)) == -1 || 517 fstat(fdesc, &sb) == -1) 518 err(1, "%s", fname); 519 if (sb.st_size == 0) 520 errx(1, "%s is empty, must not be.", fname); 521 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 522 errx(1, "%s: length must be a multiple of sector size", fname); 523 if (mboot.bootinst != NULL) 524 free(mboot.bootinst); 525 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 526 errx(1, "%s: unable to allocate read buffer", fname); 527 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 528 close(fdesc)) 529 err(1, "%s", fname); 530 if (n != mboot.bootinst_size) 531 errx(1, "%s: short read", fname); 532 #else 533 if (mboot.bootinst != NULL) 534 free(mboot.bootinst); 535 mboot.bootinst_size = secsize; 536 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 537 errx(1, "unable to allocate boot block buffer"); 538 memset(mboot.bootinst, 0, mboot.bootinst_size); 539 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 540 #endif 541 } 542 543 544 static void 545 init_sector0(unsigned long start) 546 { 547 struct dos_partition *partp = &mboot.parts[0]; 548 549 init_boot(); 550 551 partp->dp_typ = DOSPTYP_386BSD; 552 partp->dp_flag = ACTIVE; 553 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 554 if(start == 0) 555 start = dos_sectors; 556 partp->dp_start = start; 557 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 558 559 dos(partp); 560 } 561 562 static void 563 change_part(int i) 564 { 565 struct dos_partition *partp = &mboot.parts[i - 1]; 566 567 printf("The data for partition %d is:\n", i); 568 print_part(partp); 569 570 if (u_flag && ok("Do you want to change it?")) { 571 int tmp; 572 573 if (i_flag) { 574 bzero(partp, sizeof (*partp)); 575 if (i == 1) { 576 init_sector0(1); 577 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 578 print_part(partp); 579 } 580 } 581 582 do { 583 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); 584 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); 585 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); 586 if (!sanitize_partition(partp)) { 587 warnx("ERROR: failed to adjust; setting sysid to 0"); 588 partp->dp_typ = 0; 589 } 590 591 if (ok("Explicitly specify beg/end address ?")) 592 { 593 int tsec,tcyl,thd; 594 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 595 thd = partp->dp_shd; 596 tsec = DPSECT(partp->dp_ssect); 597 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 598 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); 599 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); 600 partp->dp_scyl = DOSCYL(tcyl); 601 partp->dp_ssect = DOSSECT(tsec,tcyl); 602 partp->dp_shd = thd; 603 604 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 605 thd = partp->dp_ehd; 606 tsec = DPSECT(partp->dp_esect); 607 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 608 Decimal("ending head", thd, tmp, NO_TRACK_HEADS); 609 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); 610 partp->dp_ecyl = DOSCYL(tcyl); 611 partp->dp_esect = DOSSECT(tsec,tcyl); 612 partp->dp_ehd = thd; 613 } else 614 dos(partp); 615 616 print_part(partp); 617 } while (!ok("Are we happy with this entry?")); 618 } 619 } 620 621 static void 622 print_params() 623 { 624 printf("parameters extracted from in-core disklabel are:\n"); 625 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 626 ,cyls,heads,sectors,cylsecs); 627 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 628 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 629 printf("parameters to be used for BIOS calculations are:\n"); 630 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 631 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 632 } 633 634 static void 635 change_active(int which) 636 { 637 struct dos_partition *partp = &mboot.parts[0]; 638 int active, i, new, tmp; 639 640 active = -1; 641 for (i = 0; i < NDOSPART; i++) { 642 if ((partp[i].dp_flag & ACTIVE) == 0) 643 continue; 644 printf("Partition %d is marked active\n", i + 1); 645 if (active == -1) 646 active = i + 1; 647 } 648 if (a_flag && which != -1) 649 active = which; 650 else if (active == -1) 651 active = 1; 652 653 if (!ok("Do you want to change the active partition?")) 654 return; 655 setactive: 656 do { 657 new = active; 658 Decimal("active partition", new, tmp, 0); 659 if (new < 1 || new > 4) { 660 printf("Active partition number must be in range 1-4." 661 " Try again.\n"); 662 goto setactive; 663 } 664 active = new; 665 } while (!ok("Are you happy with this choice")); 666 for (i = 0; i < NDOSPART; i++) 667 partp[i].dp_flag = 0; 668 if (active > 0 && active <= NDOSPART) 669 partp[active-1].dp_flag = ACTIVE; 670 } 671 672 static void 673 change_code() 674 { 675 if (ok("Do you want to change the boot code?")) 676 init_boot(); 677 } 678 679 void 680 get_params_to_use() 681 { 682 int tmp; 683 print_params(); 684 if (ok("Do you want to change our idea of what BIOS thinks ?")) 685 { 686 do 687 { 688 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); 689 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); 690 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); 691 dos_cylsecs = dos_heads * dos_sectors; 692 print_params(); 693 } 694 while(!ok("Are you happy with this choice")); 695 } 696 } 697 698 699 /***********************************************\ 700 * Change real numbers into strange dos numbers * 701 \***********************************************/ 702 static void 703 dos(struct dos_partition *partp) 704 { 705 int cy, sec; 706 u_int32_t end; 707 708 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 709 memcpy(partp, &mtpart, sizeof(*partp)); 710 return; 711 } 712 713 /* Start c/h/s. */ 714 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 715 cy = partp->dp_start / dos_cylsecs; 716 sec = partp->dp_start % dos_sectors + 1; 717 partp->dp_scyl = DOSCYL(cy); 718 partp->dp_ssect = DOSSECT(sec, cy); 719 720 /* End c/h/s. */ 721 end = partp->dp_start + partp->dp_size - 1; 722 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 723 cy = end / dos_cylsecs; 724 sec = end % dos_sectors + 1; 725 partp->dp_ecyl = DOSCYL(cy); 726 partp->dp_esect = DOSSECT(sec, cy); 727 } 728 729 static int 730 open_disk(int flag) 731 { 732 int rwmode; 733 734 /* Write mode if one of these flags are set. */ 735 rwmode = (a_flag || I_flag || B_flag || flag); 736 fd = g_open(disk, rwmode); 737 /* If the mode fails, try read-only if we didn't. */ 738 if (fd == -1 && errno == EPERM && rwmode) 739 fd = g_open(disk, 0); 740 if (fd == -1 && errno == ENXIO) 741 return -2; 742 if (fd == -1) { 743 warnx("can't open device %s", disk); 744 return -1; 745 } 746 if (get_params() == -1) { 747 warnx("can't get disk parameters on %s", disk); 748 return -1; 749 } 750 return fd; 751 } 752 753 static ssize_t 754 read_disk(off_t sector, void *buf) 755 { 756 757 lseek(fd, (sector * 512), 0); 758 if (secsize == 0) 759 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 760 secsize *= 2) { 761 /* try the read */ 762 int size = read(fd, buf, secsize); 763 if (size == secsize) 764 /* it worked so return */ 765 return secsize; 766 } 767 else 768 return read(fd, buf, secsize); 769 770 /* we failed to read at any of the sizes */ 771 return -1; 772 } 773 774 static int 775 geom_class_available(const char *name) 776 { 777 struct gclass *class; 778 struct gmesh mesh; 779 int error; 780 781 error = geom_gettree(&mesh); 782 if (error != 0) 783 errc(1, error, "Cannot get GEOM tree"); 784 785 LIST_FOREACH(class, &mesh.lg_class, lg_class) { 786 if (strcmp(class->lg_name, name) == 0) { 787 geom_deletetree(&mesh); 788 return (1); 789 } 790 } 791 792 geom_deletetree(&mesh); 793 794 return (0); 795 } 796 797 static int 798 write_disk(off_t sector, void *buf) 799 { 800 struct gctl_req *grq; 801 const char *errmsg; 802 char *pname; 803 int error; 804 805 /* Check that GEOM_MBR is available */ 806 if (geom_class_available("MBR") != 0) { 807 grq = gctl_get_handle(); 808 gctl_ro_param(grq, "verb", -1, "write MBR"); 809 gctl_ro_param(grq, "class", -1, "MBR"); 810 pname = g_providername(fd); 811 if (pname == NULL) { 812 warn("Error getting providername for %s", disk); 813 return (-1); 814 } 815 gctl_ro_param(grq, "geom", -1, pname); 816 gctl_ro_param(grq, "data", secsize, buf); 817 errmsg = gctl_issue(grq); 818 free(pname); 819 if (errmsg == NULL) { 820 gctl_free(grq); 821 return(0); 822 } 823 if (!q_flag) 824 warnx("GEOM_MBR: %s", errmsg); 825 gctl_free(grq); 826 } else { 827 /* 828 * Try to write MBR directly. This may help when disk 829 * is not in use. 830 * XXX: hardcoded sectorsize 831 */ 832 error = pwrite(fd, buf, secsize, (sector * 512)); 833 if (error == secsize) 834 return (0); 835 } 836 837 /* 838 * GEOM_MBR is not available or failed to write MBR. 839 * Now check that we have GEOM_PART and recommend to use gpart (8). 840 */ 841 if (geom_class_available("PART") != 0) 842 warnx("Failed to write MBR. Try to use gpart(8)."); 843 else 844 warnx("Failed to write sector zero"); 845 return(EINVAL); 846 } 847 848 static int 849 get_params() 850 { 851 int error; 852 u_int u; 853 off_t o; 854 855 error = ioctl(fd, DIOCGFWSECTORS, &u); 856 if (error == 0) 857 sectors = dos_sectors = u; 858 else 859 sectors = dos_sectors = 63; 860 861 error = ioctl(fd, DIOCGFWHEADS, &u); 862 if (error == 0) 863 heads = dos_heads = u; 864 else 865 heads = dos_heads = 255; 866 867 dos_cylsecs = cylsecs = heads * sectors; 868 disksecs = cyls * heads * sectors; 869 870 u = g_sectorsize(fd); 871 if (u <= 0) 872 return (-1); 873 874 o = g_mediasize(fd); 875 if (o < 0) 876 return (-1); 877 if (o / u <= NO_DISK_SECTORS) 878 disksecs = o / u; 879 else 880 disksecs = NO_DISK_SECTORS; 881 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 882 883 return (0); 884 } 885 886 static int 887 read_s0() 888 { 889 int i; 890 891 mboot.bootinst_size = secsize; 892 if (mboot.bootinst != NULL) 893 free(mboot.bootinst); 894 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 895 warnx("unable to allocate buffer to read fdisk " 896 "partition table"); 897 return -1; 898 } 899 if (read_disk(0, mboot.bootinst) == -1) { 900 warnx("can't read fdisk partition table"); 901 return -1; 902 } 903 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 904 warnx("invalid fdisk partition table found"); 905 /* So should we initialize things */ 906 return -1; 907 } 908 for (i = 0; i < NDOSPART; i++) 909 dos_partition_dec( 910 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 911 &mboot.parts[i]); 912 return 0; 913 } 914 915 static int 916 write_s0() 917 { 918 int sector, i; 919 920 if (iotest) { 921 print_s0(); 922 return 0; 923 } 924 for(i = 0; i < NDOSPART; i++) 925 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 926 &mboot.parts[i]); 927 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 928 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 929 if (write_disk(sector, 930 &mboot.bootinst[sector * secsize]) == -1) { 931 warn("can't write fdisk partition table"); 932 return -1; 933 } 934 return(0); 935 } 936 937 938 static int 939 ok(const char *str) 940 { 941 printf("%s [n] ", str); 942 fflush(stdout); 943 if (fgets(lbuf, LBUF, stdin) == NULL) 944 exit(1); 945 lbuf[strlen(lbuf)-1] = 0; 946 947 if (*lbuf && 948 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 949 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 950 return 1; 951 else 952 return 0; 953 } 954 955 static int 956 decimal(const char *str, int *num, int deflt, uint32_t maxval) 957 { 958 long long acc; 959 int c; 960 char *cp; 961 962 while (1) { 963 acc = 0; 964 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 965 fflush(stdout); 966 if (fgets(lbuf, LBUF, stdin) == NULL) 967 exit(1); 968 lbuf[strlen(lbuf)-1] = 0; 969 970 if (!*lbuf) 971 return 0; 972 973 cp = lbuf; 974 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 975 if (!c) 976 return 0; 977 while ((c = *cp++)) { 978 if (c <= '9' && c >= '0') { 979 if (acc <= maxval || maxval == 0) 980 acc = acc * 10 + c - '0'; 981 } else 982 break; 983 } 984 if (c == ' ' || c == '\t') 985 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 986 if (!c) { 987 if (maxval > 0 && acc > maxval) { 988 acc = maxval; 989 printf("%s exceeds maximum value allowed for " 990 "this field. The value has been reduced " 991 "to %lld\n", lbuf, acc); 992 } 993 *num = acc; 994 return 1; 995 } else 996 printf("%s is an invalid decimal number. Try again.\n", 997 lbuf); 998 } 999 } 1000 1001 1002 static void 1003 parse_config_line(char *line, CMD *command) 1004 { 1005 char *cp, *end; 1006 1007 cp = line; 1008 while (1) { 1009 memset(command, 0, sizeof(*command)); 1010 1011 while (isspace(*cp)) ++cp; 1012 if (*cp == '\0' || *cp == '#') 1013 break; 1014 command->cmd = *cp++; 1015 1016 /* 1017 * Parse args 1018 */ 1019 while (1) { 1020 while (isspace(*cp)) ++cp; 1021 if (*cp == '\0') 1022 break; /* eol */ 1023 if (*cp == '#') 1024 break; /* found comment */ 1025 if (isalpha(*cp)) 1026 command->args[command->n_args].argtype = *cp++; 1027 end = NULL; 1028 command->args[command->n_args].arg_val = strtoul(cp, &end, 0); 1029 if (cp == end || (!isspace(*end) && *end != '\0')) { 1030 char ch; 1031 end = cp; 1032 while (!isspace(*end) && *end != '\0') ++end; 1033 ch = *end; *end = '\0'; 1034 command->args[command->n_args].arg_str = strdup(cp); 1035 *end = ch; 1036 } else 1037 command->args[command->n_args].arg_str = NULL; 1038 cp = end; 1039 command->n_args++; 1040 } 1041 break; 1042 } 1043 } 1044 1045 1046 static int 1047 process_geometry(CMD *command) 1048 { 1049 int status = 1, i; 1050 1051 while (1) { 1052 geom_processed = 1; 1053 if (part_processed) { 1054 warnx( 1055 "ERROR line %d: the geometry specification line must occur before\n\ 1056 all partition specifications", 1057 current_line_number); 1058 status = 0; 1059 break; 1060 } 1061 if (command->n_args != 3) { 1062 warnx("ERROR line %d: incorrect number of geometry args", 1063 current_line_number); 1064 status = 0; 1065 break; 1066 } 1067 dos_cyls = 0; 1068 dos_heads = 0; 1069 dos_sectors = 0; 1070 for (i = 0; i < 3; ++i) { 1071 switch (command->args[i].argtype) { 1072 case 'c': 1073 dos_cyls = command->args[i].arg_val; 1074 break; 1075 case 'h': 1076 dos_heads = command->args[i].arg_val; 1077 break; 1078 case 's': 1079 dos_sectors = command->args[i].arg_val; 1080 break; 1081 default: 1082 warnx( 1083 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1084 current_line_number, command->args[i].argtype, 1085 command->args[i].argtype); 1086 status = 0; 1087 break; 1088 } 1089 } 1090 if (status == 0) 1091 break; 1092 1093 dos_cylsecs = dos_heads * dos_sectors; 1094 1095 /* 1096 * Do sanity checks on parameter values 1097 */ 1098 if (dos_cyls == 0) { 1099 warnx("ERROR line %d: number of cylinders not specified", 1100 current_line_number); 1101 status = 0; 1102 } 1103 if (dos_cyls > 1024) { 1104 warnx( 1105 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1106 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1107 is dedicated to FreeBSD)", 1108 current_line_number, dos_cyls); 1109 } 1110 1111 if (dos_heads == 0) { 1112 warnx("ERROR line %d: number of heads not specified", 1113 current_line_number); 1114 status = 0; 1115 } else if (dos_heads > 256) { 1116 warnx("ERROR line %d: number of heads must be within (1-256)", 1117 current_line_number); 1118 status = 0; 1119 } 1120 1121 if (dos_sectors == 0) { 1122 warnx("ERROR line %d: number of sectors not specified", 1123 current_line_number); 1124 status = 0; 1125 } else if (dos_sectors > 63) { 1126 warnx("ERROR line %d: number of sectors must be within (1-63)", 1127 current_line_number); 1128 status = 0; 1129 } 1130 1131 break; 1132 } 1133 return (status); 1134 } 1135 1136 static u_int32_t 1137 str2sectors(const char *str) 1138 { 1139 char *end; 1140 unsigned long val; 1141 1142 val = strtoul(str, &end, 0); 1143 if (str == end || *end == '\0') { 1144 warnx("ERROR line %d: unexpected size: \'%s\'", 1145 current_line_number, str); 1146 return NO_DISK_SECTORS; 1147 } 1148 1149 if (*end == 'K') 1150 val *= 1024UL / secsize; 1151 else if (*end == 'M') 1152 val *= 1024UL * 1024UL / secsize; 1153 else if (*end == 'G') 1154 val *= 1024UL * 1024UL * 1024UL / secsize; 1155 else { 1156 warnx("ERROR line %d: unexpected modifier: %c " 1157 "(not K/M/G)", current_line_number, *end); 1158 return NO_DISK_SECTORS; 1159 } 1160 1161 return val; 1162 } 1163 1164 static int 1165 process_partition(CMD *command) 1166 { 1167 int status = 0, partition; 1168 u_int32_t prev_head_boundary, prev_cyl_boundary; 1169 u_int32_t adj_size, max_end; 1170 struct dos_partition *partp; 1171 1172 while (1) { 1173 part_processed = 1; 1174 if (command->n_args != 4) { 1175 warnx("ERROR line %d: incorrect number of partition args", 1176 current_line_number); 1177 break; 1178 } 1179 partition = command->args[0].arg_val; 1180 if (partition < 1 || partition > 4) { 1181 warnx("ERROR line %d: invalid partition number %d", 1182 current_line_number, partition); 1183 break; 1184 } 1185 partp = &mboot.parts[partition - 1]; 1186 bzero(partp, sizeof (*partp)); 1187 partp->dp_typ = command->args[1].arg_val; 1188 if (command->args[2].arg_str != NULL) { 1189 if (strcmp(command->args[2].arg_str, "*") == 0) { 1190 int i; 1191 partp->dp_start = dos_sectors; 1192 for (i = 1; i < partition; i++) { 1193 struct dos_partition *prev_partp; 1194 prev_partp = ((struct dos_partition *) 1195 &mboot.parts) + i - 1; 1196 if (prev_partp->dp_typ != 0) 1197 partp->dp_start = prev_partp->dp_start + 1198 prev_partp->dp_size; 1199 } 1200 if (partp->dp_start % dos_sectors != 0) { 1201 prev_head_boundary = partp->dp_start / 1202 dos_sectors * dos_sectors; 1203 partp->dp_start = prev_head_boundary + 1204 dos_sectors; 1205 } 1206 } else { 1207 partp->dp_start = str2sectors(command->args[2].arg_str); 1208 if (partp->dp_start == NO_DISK_SECTORS) 1209 break; 1210 } 1211 } else 1212 partp->dp_start = command->args[2].arg_val; 1213 1214 if (command->args[3].arg_str != NULL) { 1215 if (strcmp(command->args[3].arg_str, "*") == 0) 1216 partp->dp_size = ((disksecs / dos_cylsecs) * 1217 dos_cylsecs) - partp->dp_start; 1218 else { 1219 partp->dp_size = str2sectors(command->args[3].arg_str); 1220 if (partp->dp_size == NO_DISK_SECTORS) 1221 break; 1222 } 1223 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) / 1224 dos_cylsecs) * dos_cylsecs; 1225 if (prev_cyl_boundary > partp->dp_start) 1226 partp->dp_size = prev_cyl_boundary - partp->dp_start; 1227 } else 1228 partp->dp_size = command->args[3].arg_val; 1229 1230 max_end = partp->dp_start + partp->dp_size; 1231 1232 if (partp->dp_typ == 0) { 1233 /* 1234 * Get out, the partition is marked as unused. 1235 */ 1236 /* 1237 * Insure that it's unused. 1238 */ 1239 bzero(partp, sizeof(*partp)); 1240 status = 1; 1241 break; 1242 } 1243 1244 /* 1245 * Adjust start upwards, if necessary, to fall on a head boundary. 1246 */ 1247 if (partp->dp_start % dos_sectors != 0) { 1248 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1249 if (max_end < dos_sectors || 1250 prev_head_boundary > max_end - dos_sectors) { 1251 /* 1252 * Can't go past end of partition 1253 */ 1254 warnx( 1255 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1256 a head boundary", 1257 current_line_number, partition); 1258 break; 1259 } 1260 warnx( 1261 "WARNING: adjusting start offset of partition %d\n\ 1262 from %u to %u, to fall on a head boundary", 1263 partition, (u_int)partp->dp_start, 1264 (u_int)(prev_head_boundary + dos_sectors)); 1265 partp->dp_start = prev_head_boundary + dos_sectors; 1266 } 1267 1268 /* 1269 * Adjust size downwards, if necessary, to fall on a cylinder 1270 * boundary. 1271 */ 1272 prev_cyl_boundary = 1273 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1274 if (prev_cyl_boundary > partp->dp_start) 1275 adj_size = prev_cyl_boundary - partp->dp_start; 1276 else { 1277 warnx( 1278 "ERROR: could not adjust partition to start on a head boundary\n\ 1279 and end on a cylinder boundary."); 1280 return (0); 1281 } 1282 if (adj_size != partp->dp_size) { 1283 warnx( 1284 "WARNING: adjusting size of partition %d from %u to %u\n\ 1285 to end on a cylinder boundary", 1286 partition, (u_int)partp->dp_size, (u_int)adj_size); 1287 partp->dp_size = adj_size; 1288 } 1289 if (partp->dp_size == 0) { 1290 warnx("ERROR line %d: size of partition %d is zero", 1291 current_line_number, partition); 1292 break; 1293 } 1294 1295 dos(partp); 1296 status = 1; 1297 break; 1298 } 1299 return (status); 1300 } 1301 1302 1303 static int 1304 process_active(CMD *command) 1305 { 1306 int status = 0, partition, i; 1307 struct dos_partition *partp; 1308 1309 while (1) { 1310 active_processed = 1; 1311 if (command->n_args != 1) { 1312 warnx("ERROR line %d: incorrect number of active args", 1313 current_line_number); 1314 status = 0; 1315 break; 1316 } 1317 partition = command->args[0].arg_val; 1318 if (partition < 1 || partition > 4) { 1319 warnx("ERROR line %d: invalid partition number %d", 1320 current_line_number, partition); 1321 break; 1322 } 1323 /* 1324 * Reset active partition 1325 */ 1326 partp = mboot.parts; 1327 for (i = 0; i < NDOSPART; i++) 1328 partp[i].dp_flag = 0; 1329 partp[partition-1].dp_flag = ACTIVE; 1330 1331 status = 1; 1332 break; 1333 } 1334 return (status); 1335 } 1336 1337 1338 static int 1339 process_line(char *line) 1340 { 1341 CMD command; 1342 int status = 1; 1343 1344 while (1) { 1345 parse_config_line(line, &command); 1346 switch (command.cmd) { 1347 case 0: 1348 /* 1349 * Comment or blank line 1350 */ 1351 break; 1352 case 'g': 1353 /* 1354 * Set geometry 1355 */ 1356 status = process_geometry(&command); 1357 break; 1358 case 'p': 1359 status = process_partition(&command); 1360 break; 1361 case 'a': 1362 status = process_active(&command); 1363 break; 1364 default: 1365 status = 0; 1366 break; 1367 } 1368 break; 1369 } 1370 return (status); 1371 } 1372 1373 1374 static int 1375 read_config(char *config_file) 1376 { 1377 FILE *fp = NULL; 1378 int status = 1; 1379 char buf[1010]; 1380 1381 while (1) { 1382 if (strcmp(config_file, "-") != 0) { 1383 /* 1384 * We're not reading from stdin 1385 */ 1386 if ((fp = fopen(config_file, "r")) == NULL) { 1387 status = 0; 1388 break; 1389 } 1390 } else { 1391 fp = stdin; 1392 } 1393 current_line_number = 0; 1394 while (!feof(fp)) { 1395 if (fgets(buf, sizeof(buf), fp) == NULL) 1396 break; 1397 ++current_line_number; 1398 status = process_line(buf); 1399 if (status == 0) 1400 break; 1401 } 1402 break; 1403 } 1404 if (fp) { 1405 /* 1406 * It doesn't matter if we're reading from stdin, as we've reached EOF 1407 */ 1408 fclose(fp); 1409 } 1410 return (status); 1411 } 1412 1413 1414 static void 1415 reset_boot(void) 1416 { 1417 int i; 1418 struct dos_partition *partp; 1419 1420 init_boot(); 1421 for (i = 0; i < 4; ++i) { 1422 partp = &mboot.parts[i]; 1423 bzero(partp, sizeof(*partp)); 1424 } 1425 } 1426 1427 static int 1428 sanitize_partition(struct dos_partition *partp) 1429 { 1430 u_int32_t prev_head_boundary, prev_cyl_boundary; 1431 u_int32_t max_end, size, start; 1432 1433 start = partp->dp_start; 1434 size = partp->dp_size; 1435 max_end = start + size; 1436 /* Only allow a zero size if the partition is being marked unused. */ 1437 if (size == 0) { 1438 if (start == 0 && partp->dp_typ == 0) 1439 return (1); 1440 warnx("ERROR: size of partition is zero"); 1441 return (0); 1442 } 1443 /* Return if no adjustment is necessary. */ 1444 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1445 return (1); 1446 1447 if (start == 0) { 1448 warnx("WARNING: partition overlaps with partition table"); 1449 if (ok("Correct this automatically?")) 1450 start = dos_sectors; 1451 } 1452 if (start % dos_sectors != 0) 1453 warnx("WARNING: partition does not start on a head boundary"); 1454 if ((start +size) % dos_sectors != 0) 1455 warnx("WARNING: partition does not end on a cylinder boundary"); 1456 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1457 if (!ok("Correct this automatically?")) 1458 return (1); 1459 1460 /* 1461 * Adjust start upwards, if necessary, to fall on a head boundary. 1462 */ 1463 if (start % dos_sectors != 0) { 1464 prev_head_boundary = start / dos_sectors * dos_sectors; 1465 if (max_end < dos_sectors || 1466 prev_head_boundary >= max_end - dos_sectors) { 1467 /* 1468 * Can't go past end of partition 1469 */ 1470 warnx( 1471 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1472 return (0); 1473 } 1474 start = prev_head_boundary + dos_sectors; 1475 } 1476 1477 /* 1478 * Adjust size downwards, if necessary, to fall on a cylinder 1479 * boundary. 1480 */ 1481 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1482 if (prev_cyl_boundary > start) 1483 size = prev_cyl_boundary - start; 1484 else { 1485 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1486 and end on a cylinder boundary."); 1487 return (0); 1488 } 1489 1490 /* Finally, commit any changes to partp and return. */ 1491 if (start != partp->dp_start) { 1492 warnx("WARNING: adjusting start offset of partition to %u", 1493 (u_int)start); 1494 partp->dp_start = start; 1495 } 1496 if (size != partp->dp_size) { 1497 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1498 partp->dp_size = size; 1499 } 1500 1501 return (1); 1502 } 1503 1504 /* 1505 * Try figuring out the root device's canonical disk name. 1506 * The following choices are considered: 1507 * /dev/ad0s1a => /dev/ad0 1508 * /dev/da0a => /dev/da0 1509 * /dev/vinum/root => /dev/vinum/root 1510 * A ".eli" part is removed if it exists (see geli(8)). 1511 * A ".journal" ending is removed if it exists (see gjournal(8)). 1512 */ 1513 static char * 1514 get_rootdisk(void) 1515 { 1516 struct statfs rootfs; 1517 regex_t re; 1518 #define NMATCHES 2 1519 regmatch_t rm[NMATCHES]; 1520 char dev[PATH_MAX], *s; 1521 int rv; 1522 1523 if (statfs("/", &rootfs) == -1) 1524 err(1, "statfs(\"/\")"); 1525 1526 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", 1527 REG_EXTENDED)) != 0) 1528 errx(1, "regcomp() failed (%d)", rv); 1529 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); 1530 if ((s = strstr(dev, ".eli")) != NULL) 1531 memmove(s, s+4, strlen(s + 4) + 1); 1532 1533 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) 1534 errx(1, 1535 "mounted root fs resource doesn't match expectations (regexec returned %d)", 1536 rv); 1537 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1538 errx(1, "out of memory"); 1539 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1540 rm[1].rm_eo - rm[1].rm_so); 1541 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1542 1543 return s; 1544 } 1545