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