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 * $FreeBSD: /repoman/r/ncvs/src/sbin/i386/fdisk/fdisk.c,v 1.36.2.14 2004/01/30 14:40:47 harti Exp $ 27 * $DragonFly: src/sbin/i386/fdisk/fdisk.c,v 1.16 2008/04/23 22:09:07 thomas Exp $ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/diskslice.h> 32 #include <sys/diskmbr.h> 33 #include <sys/stat.h> 34 #include <ctype.h> 35 #include <fcntl.h> 36 #include <err.h> 37 #include <fstab.h> 38 #include <errno.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 int iotest; 45 46 #define LBUF 100 47 static char lbuf[LBUF]; 48 49 #define MBRSIGOFF 510 50 51 /* 52 * 53 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 54 * 55 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 56 * Copyright (c) 1989 Robert. V. Baron 57 * Created. 58 */ 59 60 #define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 61 #define Hex(str, ans, tmp) if (hex(str, &tmp, ans)) ans = tmp 62 #define String(str, ans, len) {char *z = ans; char **dflt = &z; if (string(str, dflt)) strncpy(ans, *dflt, len); } 63 64 #define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 65 66 #define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 67 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 68 int secsize = 0; /* the sensed sector size */ 69 70 const char *disk; 71 const char *disks[] = 72 { 73 "/dev/ad0", "/dev/da0", "/dev/vkd0", 0 74 }; 75 76 int cyls, sectors, heads, cylsecs; 77 int64_t disksecs; 78 79 struct mboot 80 { 81 unsigned char padding[2]; /* force the longs to be long aligned */ 82 unsigned char *bootinst; /* boot code */ 83 off_t bootinst_size; 84 struct dos_partition parts[4]; 85 }; 86 struct mboot mboot = {{0}, NULL, 0}; 87 88 #define ACTIVE 0x80 89 #define BOOT_MAGIC 0xAA55 90 91 int dos_cyls; 92 int dos_heads; 93 int dos_sectors; 94 int dos_cylsecs; 95 96 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 97 #define DOSCYL(c) (c & 0xff) 98 #define MAXCYL 1023 99 static int partition = -1; 100 101 102 #define MAX_ARGS 10 103 104 static int current_line_number; 105 106 static int geom_processed = 0; 107 static int part_processed = 0; 108 static int active_processed = 0; 109 110 111 typedef struct cmd { 112 char cmd; 113 int n_args; 114 struct arg { 115 char argtype; 116 int arg_val; 117 } args[MAX_ARGS]; 118 } CMD; 119 120 121 static int B_flag = 0; /* replace boot code */ 122 static int C_flag = 0; /* use wrapped values for CHS */ 123 static int I_flag = 0; /* use entire disk for DragonFly */ 124 static int a_flag = 0; /* set active partition */ 125 static char *b_flag = NULL; /* path to boot code */ 126 static int i_flag = 0; /* replace partition data */ 127 static int u_flag = 0; /* update partition data */ 128 static int p_flag = 0; /* operate on a disk image file */ 129 static int s_flag = 0; /* Print a summary and exit */ 130 static int t_flag = 0; /* test only */ 131 static char *f_flag = NULL; /* Read config info from file */ 132 static int v_flag = 0; /* Be verbose */ 133 134 struct part_type 135 { 136 unsigned char type; 137 char *name; 138 }part_types[] = 139 { 140 {0x00, "unused"} 141 ,{0x01, "Primary DOS with 12 bit FAT"} 142 ,{0x02, "XENIX / filesystem"} 143 ,{0x03, "XENIX /usr filesystem"} 144 ,{0x04, "Primary DOS with 16 bit FAT (<= 32MB)"} 145 ,{0x05, "Extended DOS"} 146 ,{0x06, "Primary 'big' DOS (> 32MB)"} 147 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 148 ,{0x08, "AIX filesystem"} 149 ,{0x09, "AIX boot partition or Coherent"} 150 ,{0x0A, "OS/2 Boot Manager or OPUS"} 151 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 152 ,{0x0C, "DOS or Windows 95 with 32 bit FAT, LBA"} 153 ,{0x0E, "Primary 'big' DOS (> 32MB, LBA)"} 154 ,{0x0F, "Extended DOS, LBA"} 155 ,{0x10, "OPUS"} 156 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 157 ,{0x12, "Compaq diagnostics"} 158 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 159 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 160 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 161 ,{0x18, "AST Windows swapfile"} 162 ,{0x24, "NEC DOS"} 163 ,{0x39, "plan9"} 164 ,{0x3C, "PartitionMagic recovery"} 165 ,{0x40, "VENIX 286"} 166 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 167 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 168 ,{0x43, "Linux native (sharing disk with DRDOS)"} 169 ,{0x4D, "QNX 4.2 Primary"} 170 ,{0x4E, "QNX 4.2 Secondary"} 171 ,{0x4F, "QNX 4.2 Tertiary"} 172 ,{0x50, "DM"} 173 ,{0x51, "DM"} 174 ,{0x52, "CP/M or Microport SysV/AT"} 175 ,{0x53, "DM6 Aux3"} 176 ,{0x54, "DM6"} 177 ,{0x55, "EZ-Drive (disk manager)"} 178 ,{0x56, "GB"} 179 ,{0x5C, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 180 ,{0x61, "Speed"} 181 ,{0x63, "ISC UNIX, other System V/386, GNU HURD or Mach"} 182 ,{0x64, "Novell Netware 2.xx"} 183 ,{0x65, "Novell Netware 3.xx"} 184 ,{0x70, "DiskSecure Multi-Boot"} 185 ,{0x75, "PCIX"} 186 ,{0x77, "QNX4.x"} 187 ,{0x78, "QNX4.x 2nd part"} 188 ,{0x79, "QNX4.x 3rd part"} 189 ,{0x80, "Minix 1.1 ... 1.4a"} 190 ,{0x81, "Minix 1.4b ... 1.5.10"} 191 ,{0x82, "Linux swap or Solaris x86"} 192 ,{0x83, "Linux filesystem"} 193 ,{0x84, "OS/2 hidden C: drive"} 194 ,{0x85, "Linux extended"} 195 ,{0x86, "NTFS volume set??"} 196 ,{0x87, "NTFS volume set??"} 197 ,{0x93, "Amoeba filesystem"} 198 ,{0x94, "Amoeba bad block table"} 199 ,{0x9F, "BSD/OS"} 200 ,{0xA0, "Suspend to Disk"} 201 ,{0xA5, "DragonFly/FreeBSD/NetBSD/386BSD"} 202 ,{0xA6, "OpenBSD"} 203 ,{0xA7, "NEXTSTEP"} 204 ,{0xA9, "NetBSD"} 205 ,{0xAC, "IBM JFS"} 206 ,{0xB7, "BSDI BSD/386 filesystem"} 207 ,{0xB8, "BSDI BSD/386 swap"} 208 ,{0xBE, "Solaris x86 boot"} 209 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 210 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 211 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 212 ,{0xC7, "Syrinx"} 213 ,{0xDB, "Concurrent CPM or C.DOS or CTOS"} 214 ,{0xE1, "Speed"} 215 ,{0xE3, "Speed"} 216 ,{0xE4, "Speed"} 217 ,{0xEB, "BeOS file system"} 218 ,{0xEE, "EFI GPT"} 219 ,{0xEF, "EFI System Partition"} 220 ,{0xF1, "Speed"} 221 ,{0xF2, "DOS 3.3+ Secondary"} 222 ,{0xF4, "Speed"} 223 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 224 ,{0xFF, "BBT (Bad Blocks Table)"} 225 }; 226 227 static void print_s0(int which); 228 static void print_part(int i); 229 static void init_sector0(unsigned long start); 230 static void init_boot(void); 231 static void change_part(int i); 232 static void print_params(); 233 static void change_active(int which); 234 static void change_code(); 235 static void get_params_to_use(); 236 static void dos(struct dos_partition *partp); 237 static int open_disk(int u_flag); 238 static ssize_t read_disk(off_t sector, void *buf); 239 static ssize_t write_disk(off_t sector, void *buf); 240 static int get_params(); 241 static int read_s0(); 242 static int write_s0(); 243 static int ok(char *str); 244 static int decimal(char *str, int *num, int deflt); 245 static char *get_type(int type); 246 static int read_config(char *config_file); 247 static void reset_boot(void); 248 static int sanitize_partition(struct dos_partition *); 249 static void usage(void); 250 #if 0 251 static int hex(char *str, int *num, int deflt); 252 static int string(char *str, char **ans); 253 #endif 254 255 256 int 257 main(int argc, char *argv[]) 258 { 259 int c, i; 260 261 while ((c = getopt(argc, argv, "BCIab:f:p:istuv1234")) != -1) 262 switch (c) { 263 case 'B': 264 B_flag = 1; 265 break; 266 case 'C': 267 C_flag = 1; 268 break; 269 case 'I': 270 I_flag = 1; 271 break; 272 case 'a': 273 a_flag = 1; 274 break; 275 case 'b': 276 b_flag = optarg; 277 break; 278 case 'f': 279 f_flag = optarg; 280 break; 281 case 'p': 282 disk = optarg; 283 p_flag = 1; 284 break; 285 case 'i': 286 i_flag = 1; 287 break; 288 case 's': 289 s_flag = 1; 290 break; 291 case 't': 292 t_flag = 1; 293 break; 294 case 'u': 295 u_flag = 1; 296 break; 297 case 'v': 298 v_flag = 1; 299 break; 300 case '1': 301 case '2': 302 case '3': 303 case '4': 304 partition = c - '0'; 305 break; 306 default: 307 usage(); 308 } 309 if (f_flag || i_flag) 310 u_flag = 1; 311 if (t_flag) 312 v_flag = 1; 313 argc -= optind; 314 argv += optind; 315 316 if (argc > 0) { 317 disk = getdevpath(argv[0], 0); 318 if (open_disk(u_flag) < 0) 319 err(1, "cannot open disk %s", disk); 320 } else if (disk == NULL) { 321 int rv = 0; 322 323 for(i = 0; disks[i]; i++) 324 { 325 disk = disks[i]; 326 rv = open_disk(u_flag); 327 if(rv != -2) break; 328 } 329 if(rv < 0) 330 err(1, "cannot open any disk"); 331 } else { 332 if (open_disk(u_flag) < 0) 333 err(1, "cannot open disk %s", disk); 334 } 335 336 /* (abu)use mboot.bootinst to probe for the sector size */ 337 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 338 err(1, "cannot allocate buffer to determine disk sector size"); 339 read_disk(0, mboot.bootinst); 340 free(mboot.bootinst); 341 mboot.bootinst = NULL; 342 343 if (s_flag) 344 { 345 int i; 346 struct dos_partition *partp; 347 348 if (read_s0()) 349 err(1, "read_s0"); 350 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 351 dos_sectors); 352 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 353 for (i = 0; i < NDOSPART; i++) { 354 partp = ((struct dos_partition *) &mboot.parts) + i; 355 if (partp->dp_start == 0 && partp->dp_size == 0) 356 continue; 357 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 358 (u_long) partp->dp_start, 359 (u_long) partp->dp_size, partp->dp_typ, 360 partp->dp_flag); 361 } 362 exit(0); 363 } 364 365 printf("******* Working on device %s *******\n",disk); 366 367 if (I_flag) 368 { 369 struct dos_partition *partp; 370 371 read_s0(); 372 reset_boot(); 373 partp = (struct dos_partition *) (&mboot.parts[0]); 374 partp->dp_typ = DOSPTYP_386BSD; 375 partp->dp_flag = ACTIVE; 376 partp->dp_start = dos_sectors; 377 if (disksecs - dos_sectors > 0xFFFFFFFFU) { 378 printf("Warning: Ending logical block > 2TB, using max value\n"); 379 partp->dp_size = 0xFFFFFFFFU; 380 } else { 381 partp->dp_size = (disksecs / dos_cylsecs) * 382 dos_cylsecs - dos_sectors; 383 } 384 dos(partp); 385 if (v_flag) 386 print_s0(-1); 387 if (!t_flag) 388 write_s0(); 389 exit(0); 390 } 391 if (f_flag) 392 { 393 if (read_s0() || i_flag) 394 { 395 reset_boot(); 396 } 397 398 if (!read_config(f_flag)) 399 { 400 exit(1); 401 } 402 if (v_flag) 403 { 404 print_s0(-1); 405 } 406 if (!t_flag) 407 { 408 write_s0(); 409 } 410 } 411 else 412 { 413 if(u_flag) 414 { 415 get_params_to_use(); 416 } 417 else 418 { 419 print_params(); 420 } 421 422 if (read_s0()) 423 init_sector0(dos_sectors); 424 425 printf("Media sector size is %d\n", secsize); 426 printf("Warning: BIOS sector numbering starts with sector 1\n"); 427 printf("Information from DOS bootblock is:\n"); 428 if (partition == -1) 429 for (i = 1; i <= NDOSPART; i++) 430 change_part(i); 431 else 432 change_part(partition); 433 434 if (u_flag || a_flag) 435 change_active(partition); 436 437 if (B_flag) 438 change_code(); 439 440 if (u_flag || a_flag || B_flag) { 441 if (!t_flag) { 442 printf("\nWe haven't changed the partition table yet. "); 443 printf("This is your last chance.\n"); 444 } 445 print_s0(-1); 446 if (!t_flag) { 447 if (ok("Should we write new partition table?")) 448 write_s0(); 449 } 450 else 451 { 452 printf("\n-t flag specified -- partition table not written.\n"); 453 } 454 } 455 } 456 457 exit(0); 458 } 459 460 static void 461 usage(void) 462 { 463 fprintf(stderr, "%s%s", 464 "usage: fdisk [-BCIaistu] [-b bootcode] [-p diskimage] [-1234] [disk]\n", 465 " fdisk -f configfile [-itv] [disk]\n"); 466 exit(1); 467 } 468 469 static void 470 print_s0(int which) 471 { 472 int i; 473 474 print_params(); 475 printf("Information from DOS bootblock is:\n"); 476 if (which == -1) 477 for (i = 1; i <= NDOSPART; i++) 478 printf("%d: ", i), print_part(i); 479 else 480 print_part(which); 481 } 482 483 static struct dos_partition mtpart = { 0 }; 484 485 static void 486 print_part(int i) 487 { 488 struct dos_partition *partp; 489 u_int64_t part_mb; 490 491 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 492 493 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 494 printf("<UNUSED>\n"); 495 return; 496 } 497 /* 498 * Be careful not to overflow. 499 */ 500 part_mb = partp->dp_size; 501 part_mb *= secsize; 502 part_mb /= (1024 * 1024); 503 printf("sysid %d,(%s)\n", partp->dp_typ, get_type(partp->dp_typ)); 504 printf(" start %lu, size %lu (%jd Meg), flag %x%s\n", 505 (u_long)partp->dp_start, 506 (u_long)partp->dp_size, 507 (intmax_t)part_mb, 508 partp->dp_flag, 509 partp->dp_flag == ACTIVE ? " (active)" : ""); 510 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 511 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 512 ,partp->dp_shd 513 ,DPSECT(partp->dp_ssect) 514 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 515 ,partp->dp_ehd 516 ,DPSECT(partp->dp_esect)); 517 } 518 519 520 static void 521 init_boot(void) 522 { 523 const char *fname; 524 int fd, n; 525 struct stat sb; 526 527 fname = b_flag ? b_flag : "/boot/mbr"; 528 if ((fd = open(fname, O_RDONLY)) == -1 || 529 fstat(fd, &sb) == -1) 530 err(1, "%s", fname); 531 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 532 errx(1, "%s: length must be a multiple of sector size", fname); 533 if (mboot.bootinst != NULL) 534 free(mboot.bootinst); 535 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 536 errx(1, "%s: unable to allocate read buffer", fname); 537 if ((n = read(fd, mboot.bootinst, mboot.bootinst_size)) == -1 || 538 close(fd)) 539 err(1, "%s", fname); 540 if (n != mboot.bootinst_size) 541 errx(1, "%s: short read", fname); 542 } 543 544 545 static void 546 init_sector0(unsigned long start) 547 { 548 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]); 549 550 init_boot(); 551 552 partp->dp_typ = DOSPTYP_386BSD; 553 partp->dp_flag = ACTIVE; 554 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 555 if(start == 0) 556 start = dos_sectors; 557 partp->dp_start = start; 558 if (disksecs - start > 0xFFFFFFFFU) { 559 printf("Warning: Ending logical block > 2TB, using max value\n"); 560 partp->dp_size = 0xFFFFFFFFU; 561 } else { 562 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 563 } 564 565 dos(partp); 566 } 567 568 static void 569 change_part(int i) 570 { 571 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 572 573 printf("The data for partition %d is:\n", i); 574 print_part(i); 575 576 if (u_flag && ok("Do you want to change it?")) { 577 int tmp; 578 579 if (i_flag) { 580 bzero((char *)partp, sizeof (struct dos_partition)); 581 if (i == 4) { 582 init_sector0(1); 583 printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n"); 584 print_part(i); 585 } 586 } 587 588 do { 589 Decimal("sysid (165=DragonFly)", partp->dp_typ, tmp); 590 Decimal("start", partp->dp_start, tmp); 591 Decimal("size", partp->dp_size, tmp); 592 if (!sanitize_partition(partp)) { 593 warnx("ERROR: failed to adjust; setting sysid to 0"); 594 partp->dp_typ = 0; 595 } 596 597 if (ok("Explicitly specify beg/end address ?")) 598 { 599 int tsec,tcyl,thd; 600 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 601 thd = partp->dp_shd; 602 tsec = DPSECT(partp->dp_ssect); 603 Decimal("beginning cylinder", tcyl, tmp); 604 Decimal("beginning head", thd, tmp); 605 Decimal("beginning sector", tsec, tmp); 606 if (tcyl > MAXCYL && C_flag == 0) { 607 printf("Warning: starting cylinder wraps, using all 1's\n"); 608 partp->dp_scyl = -1; 609 partp->dp_ssect = -1; 610 partp->dp_shd = -1; 611 } else { 612 partp->dp_scyl = DOSCYL(tcyl); 613 partp->dp_ssect = DOSSECT(tsec,tcyl); 614 partp->dp_shd = thd; 615 } 616 617 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 618 thd = partp->dp_ehd; 619 tsec = DPSECT(partp->dp_esect); 620 Decimal("ending cylinder", tcyl, tmp); 621 Decimal("ending head", thd, tmp); 622 Decimal("ending sector", tsec, tmp); 623 if (tcyl > MAXCYL && C_flag == 0) { 624 printf("Warning: ending cylinder wraps, using all 1's\n"); 625 partp->dp_ecyl = -1; 626 partp->dp_esect = -1; 627 partp->dp_ehd = -1; 628 } else { 629 partp->dp_ecyl = DOSCYL(tcyl); 630 partp->dp_esect = DOSSECT(tsec,tcyl); 631 partp->dp_ehd = thd; 632 } 633 } else 634 dos(partp); 635 636 print_part(i); 637 } while (!ok("Are we happy with this entry?")); 638 } 639 } 640 641 static void 642 print_params(void) 643 { 644 printf("parameters extracted from device are:\n"); 645 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 646 ,cyls,heads,sectors,cylsecs); 647 if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255)) 648 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 649 printf("parameters to be used for BIOS calculations are:\n"); 650 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 651 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 652 } 653 654 static void 655 change_active(int which) 656 { 657 struct dos_partition *partp = &mboot.parts[0]; 658 int active, i, new, tmp; 659 660 active = -1; 661 for (i = 0; i < NDOSPART; i++) { 662 if ((partp[i].dp_flag & ACTIVE) == 0) 663 continue; 664 printf("Partition %d is marked active\n", i + 1); 665 if (active == -1) 666 active = i + 1; 667 } 668 if (a_flag && which != -1) 669 active = which; 670 else if (active == -1) 671 active = 1; 672 673 if (!ok("Do you want to change the active partition?")) 674 return; 675 setactive: 676 do { 677 new = active; 678 Decimal("active partition", new, tmp); 679 if (new < 1 || new > 4) { 680 printf("Active partition number must be in range 1-4." 681 " Try again.\n"); 682 goto setactive; 683 } 684 active = new; 685 } while (!ok("Are you happy with this choice")); 686 for (i = 0; i < NDOSPART; i++) 687 partp[i].dp_flag = 0; 688 if (active > 0 && active <= NDOSPART) 689 partp[active-1].dp_flag = ACTIVE; 690 } 691 692 static void 693 change_code(void) 694 { 695 if (ok("Do you want to change the boot code?")) 696 init_boot(); 697 } 698 699 void 700 get_params_to_use(void) 701 { 702 int tmp; 703 print_params(); 704 if (ok("Do you want to change our idea of what BIOS thinks ?")) 705 { 706 do 707 { 708 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 709 Decimal("BIOS's idea of #heads", dos_heads, tmp); 710 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 711 dos_cylsecs = dos_heads * dos_sectors; 712 print_params(); 713 } 714 while(!ok("Are you happy with this choice")); 715 } 716 } 717 718 719 /***********************************************\ 720 * Change real numbers into strange dos numbers * 721 \***********************************************/ 722 static void 723 dos(struct dos_partition *partp) 724 { 725 int cy, sec; 726 u_int32_t end; 727 728 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 729 memcpy(partp, &mtpart, sizeof(*partp)); 730 return; 731 } 732 733 /* Start c/h/s. */ 734 cy = partp->dp_start / dos_cylsecs; 735 sec = partp->dp_start % dos_sectors + 1; 736 if (cy > MAXCYL && C_flag == 0) { 737 printf("Warning: starting cylinder wraps, using all 1's\n"); 738 partp->dp_shd = -1; 739 partp->dp_scyl = -1; 740 partp->dp_ssect = -1; 741 } else { 742 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 743 partp->dp_scyl = DOSCYL(cy); 744 partp->dp_ssect = DOSSECT(sec, cy); 745 } 746 747 /* End c/h/s. */ 748 end = partp->dp_start + partp->dp_size - 1; 749 cy = end / dos_cylsecs; 750 sec = end % dos_sectors + 1; 751 if (cy > MAXCYL && C_flag == 0) { 752 printf("Warning: ending cylinder wraps, using all 1's\n"); 753 partp->dp_ehd = -1; 754 partp->dp_ecyl = -1; 755 partp->dp_esect = -1; 756 } else { 757 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 758 partp->dp_ecyl = DOSCYL(cy); 759 partp->dp_esect = DOSSECT(sec, cy); 760 } 761 } 762 763 int fd; 764 765 /* Getting device status */ 766 767 static int 768 open_disk(int u_flag) 769 { 770 struct stat st; 771 772 if (stat(disk, &st) == -1) { 773 if (errno == ENOENT) 774 return -2; 775 warnx("can't get file status of %s", disk); 776 return -1; 777 } 778 if ( !(st.st_mode & S_IFCHR) && p_flag == 0 ) 779 warnx("device %s is not character special", disk); 780 if ((fd = open(disk, 781 a_flag || I_flag || B_flag || u_flag ? O_RDWR : O_RDONLY)) == -1) { 782 if(errno == ENXIO) 783 return -2; 784 warnx("can't open device %s", disk); 785 return -1; 786 } 787 if (get_params() == -1) { 788 warnx("can't get disk parameters on %s", disk); 789 return -1; 790 } 791 return fd; 792 } 793 794 static ssize_t 795 read_disk(off_t sector, void *buf) 796 { 797 lseek(fd,(sector * 512), 0); 798 if( secsize == 0 ) 799 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 800 { 801 /* try the read */ 802 int size = read(fd, buf, secsize); 803 if( size == secsize ) 804 /* it worked so return */ 805 return secsize; 806 } 807 else 808 return read( fd, buf, secsize ); 809 810 /* we failed to read at any of the sizes */ 811 return -1; 812 } 813 814 static ssize_t 815 write_disk(off_t sector, void *buf) 816 { 817 lseek(fd,(sector * 512), 0); 818 /* write out in the size that the read_disk found worked */ 819 return write(fd, buf, secsize); 820 } 821 822 static int 823 get_params(void) 824 { 825 struct partinfo partinfo; /* disk parameters */ 826 struct stat st; 827 828 /* 829 * NOTE: When faking up the CHS for a file image (e.g. for USB), 830 * we must use max values. If we do not then an overflowed 831 * cylinder count will, by convention, set the CHS fields to 832 * all 1's. The heads and sectors in the CHS fields will then 833 * exceed the basic geometry which can cause BIOSes to brick. 834 */ 835 if (ioctl(fd, DIOCGPART, &partinfo) == -1) { 836 if (p_flag && fstat(fd, &st) == 0 && st.st_size) { 837 sectors = 63; 838 heads = 255; 839 cylsecs = heads * sectors; 840 cyls = st.st_size / 512 / cylsecs; 841 } else { 842 warnx("can't get disk parameters on %s; supplying dummy ones", 843 disk); 844 heads = 1; 845 cylsecs = heads * sectors; 846 } 847 } else { 848 cyls = partinfo.d_ncylinders; 849 heads = partinfo.d_nheads; 850 sectors = partinfo.d_secpertrack; 851 cylsecs = heads * sectors; 852 secsize = partinfo.media_blksize; 853 } 854 dos_cyls = cyls; 855 dos_heads = heads; 856 dos_sectors = sectors; 857 dos_cylsecs = cylsecs; 858 disksecs = (int64_t)cyls * heads * sectors; 859 return (disksecs); 860 } 861 862 863 static int 864 read_s0(void) 865 { 866 mboot.bootinst_size = secsize; 867 if (mboot.bootinst != NULL) 868 free(mboot.bootinst); 869 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 870 warnx("unable to allocate buffer to read fdisk " 871 "partition table"); 872 return -1; 873 } 874 if (read_disk(0, mboot.bootinst) == -1) { 875 warnx("can't read fdisk partition table"); 876 return -1; 877 } 878 if (*(uint16_t *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 879 warnx("invalid fdisk partition table found"); 880 /* So should we initialize things */ 881 return -1; 882 } 883 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 884 return 0; 885 } 886 887 static int 888 write_s0(void) 889 { 890 #ifdef NOT_NOW 891 int flag; 892 #endif 893 int sector; 894 895 if (iotest) { 896 print_s0(-1); 897 return 0; 898 } 899 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 900 /* 901 * write enable label sector before write (if necessary), 902 * disable after writing. 903 * needed if the disklabel protected area also protects 904 * sector 0. (e.g. empty disk) 905 */ 906 #ifdef NOT_NOW 907 flag = 1; 908 if (ioctl(fd, DIOCWLABEL, &flag) < 0) 909 warn("ioctl DIOCWLABEL"); 910 #endif 911 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 912 if (write_disk(sector, 913 &mboot.bootinst[sector * secsize]) == -1) { 914 warn("can't write fdisk partition table"); 915 return -1; 916 #ifdef NOT_NOW 917 flag = 0; 918 ioctl(fd, DIOCWLABEL, &flag); 919 #endif 920 } 921 #ifdef NOT_NOW 922 flag = 0; 923 ioctl(fd, DIOCWLABEL, &flag); 924 #endif 925 return(0); 926 } 927 928 929 static int 930 ok(char *str) 931 { 932 printf("%s [n] ", str); 933 fflush(stdout); 934 if (fgets(lbuf, LBUF, stdin) == NULL) 935 exit(1); 936 lbuf[strlen(lbuf)-1] = 0; 937 938 if (*lbuf && 939 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 940 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 941 return 1; 942 else 943 return 0; 944 } 945 946 static int 947 decimal(char *str, int *num, int deflt) 948 { 949 int acc = 0, c; 950 char *cp; 951 952 while (1) { 953 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 954 fflush(stdout); 955 if (fgets(lbuf, LBUF, stdin) == NULL) 956 exit(1); 957 lbuf[strlen(lbuf)-1] = 0; 958 959 if (!*lbuf) 960 return 0; 961 962 cp = lbuf; 963 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 964 if (!c) 965 return 0; 966 while ((c = *cp++)) { 967 if (c <= '9' && c >= '0') 968 acc = acc * 10 + c - '0'; 969 else 970 break; 971 } 972 if (c == ' ' || c == '\t') 973 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 974 if (!c) { 975 *num = acc; 976 return 1; 977 } else 978 printf("%s is an invalid decimal number. Try again.\n", 979 lbuf); 980 } 981 982 } 983 984 #if 0 985 static int 986 hex(char *str, int *num, int deflt) 987 { 988 int acc = 0, c; 989 char *cp; 990 991 while (1) { 992 printf("Supply a hex value for \"%s\" [%x] ", str, deflt); 993 fgets(lbuf, LBUF, stdin); 994 lbuf[strlen(lbuf)-1] = 0; 995 996 if (!*lbuf) 997 return 0; 998 999 cp = lbuf; 1000 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1001 if (!c) 1002 return 0; 1003 while ((c = *cp++)) { 1004 if (c <= '9' && c >= '0') 1005 acc = (acc << 4) + c - '0'; 1006 else if (c <= 'f' && c >= 'a') 1007 acc = (acc << 4) + c - 'a' + 10; 1008 else if (c <= 'F' && c >= 'A') 1009 acc = (acc << 4) + c - 'A' + 10; 1010 else 1011 break; 1012 } 1013 if (c == ' ' || c == '\t') 1014 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1015 if (!c) { 1016 *num = acc; 1017 return 1; 1018 } else 1019 printf("%s is an invalid hex number. Try again.\n", 1020 lbuf); 1021 } 1022 1023 } 1024 1025 static int 1026 string(char *str, char **ans) 1027 { 1028 int c; 1029 char *cp = lbuf; 1030 1031 while (1) { 1032 printf("Supply a string value for \"%s\" [%s] ", str, *ans); 1033 fgets(lbuf, LBUF, stdin); 1034 lbuf[strlen(lbuf)-1] = 0; 1035 1036 if (!*lbuf) 1037 return 0; 1038 1039 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1040 if (c == '"') { 1041 c = *++cp; 1042 *ans = cp; 1043 while ((c = *cp) && c != '"') cp++; 1044 } else { 1045 *ans = cp; 1046 while ((c = *cp) && c != ' ' && c != '\t') cp++; 1047 } 1048 1049 if (c) 1050 *cp = 0; 1051 return 1; 1052 } 1053 } 1054 #endif 1055 1056 static char * 1057 get_type(int type) 1058 { 1059 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 1060 int counter = 0; 1061 struct part_type *ptr = part_types; 1062 1063 1064 while(counter < numentries) 1065 { 1066 if(ptr->type == type) 1067 { 1068 return(ptr->name); 1069 } 1070 ptr++; 1071 counter++; 1072 } 1073 return("unknown"); 1074 } 1075 1076 1077 static void 1078 parse_config_line(char *line, CMD *command) 1079 { 1080 char *cp, *end; 1081 1082 cp = line; 1083 while (1) /* dirty trick used to insure one exit point for this 1084 function */ 1085 { 1086 memset(command, 0, sizeof(*command)); 1087 1088 while (isspace(*cp)) ++cp; 1089 if (*cp == '\0' || *cp == '#') 1090 { 1091 break; 1092 } 1093 command->cmd = *cp++; 1094 1095 /* 1096 * Parse args 1097 */ 1098 while (1) 1099 { 1100 while (isspace(*cp)) ++cp; 1101 if (*cp == '#') 1102 { 1103 break; /* found comment */ 1104 } 1105 if (isalpha(*cp)) 1106 { 1107 command->args[command->n_args].argtype = *cp++; 1108 } 1109 if (!isdigit(*cp)) 1110 { 1111 break; /* assume end of line */ 1112 } 1113 end = NULL; 1114 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 1115 if (cp == end) 1116 { 1117 break; /* couldn't parse number */ 1118 } 1119 cp = end; 1120 command->n_args++; 1121 } 1122 break; 1123 } 1124 } 1125 1126 1127 static int 1128 process_geometry(CMD *command) 1129 { 1130 int status = 1, i; 1131 1132 while (1) 1133 { 1134 geom_processed = 1; 1135 if (part_processed) 1136 { 1137 warnx( 1138 "ERROR line %d: the geometry specification line must occur before\n\ 1139 all partition specifications", 1140 current_line_number); 1141 status = 0; 1142 break; 1143 } 1144 if (command->n_args != 3) 1145 { 1146 warnx("ERROR line %d: incorrect number of geometry args", 1147 current_line_number); 1148 status = 0; 1149 break; 1150 } 1151 dos_cyls = -1; 1152 dos_heads = -1; 1153 dos_sectors = -1; 1154 for (i = 0; i < 3; ++i) 1155 { 1156 switch (command->args[i].argtype) 1157 { 1158 case 'c': 1159 dos_cyls = command->args[i].arg_val; 1160 break; 1161 case 'h': 1162 dos_heads = command->args[i].arg_val; 1163 break; 1164 case 's': 1165 dos_sectors = command->args[i].arg_val; 1166 break; 1167 default: 1168 warnx( 1169 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1170 current_line_number, command->args[i].argtype, 1171 command->args[i].argtype); 1172 status = 0; 1173 break; 1174 } 1175 } 1176 if (status == 0) 1177 { 1178 break; 1179 } 1180 1181 dos_cylsecs = dos_heads * dos_sectors; 1182 1183 /* 1184 * Do sanity checks on parameter values 1185 */ 1186 if (dos_cyls < 0) 1187 { 1188 warnx("ERROR line %d: number of cylinders not specified", 1189 current_line_number); 1190 status = 0; 1191 } 1192 if (dos_cyls == 0 || dos_cyls > 1024) 1193 { 1194 warnx( 1195 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1196 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1197 is dedicated to DragonFly)", 1198 current_line_number, dos_cyls); 1199 } 1200 1201 if (dos_heads < 0) 1202 { 1203 warnx("ERROR line %d: number of heads not specified", 1204 current_line_number); 1205 status = 0; 1206 } 1207 else if (dos_heads < 1 || dos_heads > 256) 1208 { 1209 warnx("ERROR line %d: number of heads must be within (1-256)", 1210 current_line_number); 1211 status = 0; 1212 } 1213 1214 if (dos_sectors < 0) 1215 { 1216 warnx("ERROR line %d: number of sectors not specified", 1217 current_line_number); 1218 status = 0; 1219 } 1220 else if (dos_sectors < 1 || dos_sectors > 63) 1221 { 1222 warnx("ERROR line %d: number of sectors must be within (1-63)", 1223 current_line_number); 1224 status = 0; 1225 } 1226 1227 break; 1228 } 1229 return (status); 1230 } 1231 1232 1233 static int 1234 process_partition(CMD *command) 1235 { 1236 int status = 0, partition; 1237 u_int32_t prev_head_boundary, prev_cyl_boundary; 1238 u_int32_t adj_size, max_end; 1239 struct dos_partition *partp; 1240 1241 while (1) 1242 { 1243 part_processed = 1; 1244 if (command->n_args != 4) 1245 { 1246 warnx("ERROR line %d: incorrect number of partition args", 1247 current_line_number); 1248 break; 1249 } 1250 partition = command->args[0].arg_val; 1251 if (partition < 1 || partition > 4) 1252 { 1253 warnx("ERROR line %d: invalid partition number %d", 1254 current_line_number, partition); 1255 break; 1256 } 1257 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1258 bzero((char *)partp, sizeof (struct dos_partition)); 1259 partp->dp_typ = command->args[1].arg_val; 1260 partp->dp_start = command->args[2].arg_val; 1261 partp->dp_size = command->args[3].arg_val; 1262 max_end = partp->dp_start + partp->dp_size; 1263 1264 if (partp->dp_typ == 0) 1265 { 1266 /* 1267 * Get out, the partition is marked as unused. 1268 */ 1269 /* 1270 * Insure that it's unused. 1271 */ 1272 bzero((char *)partp, sizeof (struct dos_partition)); 1273 status = 1; 1274 break; 1275 } 1276 1277 /* 1278 * Adjust start upwards, if necessary, to fall on an head boundary. 1279 */ 1280 if (partp->dp_start % dos_sectors != 0) 1281 { 1282 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1283 if (max_end < dos_sectors || 1284 prev_head_boundary > max_end - dos_sectors) 1285 { 1286 /* 1287 * Can't go past end of partition 1288 */ 1289 warnx( 1290 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1291 a head boundary", 1292 current_line_number, partition); 1293 break; 1294 } 1295 warnx( 1296 "WARNING: adjusting start offset of partition %d\n\ 1297 from %u to %u, to fall on a head boundary", 1298 partition, (u_int)partp->dp_start, 1299 (u_int)(prev_head_boundary + dos_sectors)); 1300 partp->dp_start = prev_head_boundary + dos_sectors; 1301 } 1302 1303 /* 1304 * Adjust size downwards, if necessary, to fall on a cylinder 1305 * boundary. 1306 */ 1307 prev_cyl_boundary = 1308 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1309 if (prev_cyl_boundary > partp->dp_start) 1310 adj_size = prev_cyl_boundary - partp->dp_start; 1311 else 1312 { 1313 warnx( 1314 "ERROR: could not adjust partition to start on a head boundary\n\ 1315 and end on a cylinder boundary."); 1316 return (0); 1317 } 1318 if (adj_size != partp->dp_size) 1319 { 1320 warnx( 1321 "WARNING: adjusting size of partition %d from %u to %u\n\ 1322 to end on a cylinder boundary", 1323 partition, (u_int)partp->dp_size, (u_int)adj_size); 1324 partp->dp_size = adj_size; 1325 } 1326 if (partp->dp_size == 0) 1327 { 1328 warnx("ERROR line %d: size of partition %d is zero", 1329 current_line_number, partition); 1330 break; 1331 } 1332 1333 dos(partp); 1334 status = 1; 1335 break; 1336 } 1337 return (status); 1338 } 1339 1340 1341 static int 1342 process_active(CMD *command) 1343 { 1344 int status = 0, partition, i; 1345 struct dos_partition *partp; 1346 1347 while (1) 1348 { 1349 active_processed = 1; 1350 if (command->n_args != 1) 1351 { 1352 warnx("ERROR line %d: incorrect number of active args", 1353 current_line_number); 1354 status = 0; 1355 break; 1356 } 1357 partition = command->args[0].arg_val; 1358 if (partition < 1 || partition > 4) 1359 { 1360 warnx("ERROR line %d: invalid partition number %d", 1361 current_line_number, partition); 1362 break; 1363 } 1364 /* 1365 * Reset active partition 1366 */ 1367 partp = ((struct dos_partition *) &mboot.parts); 1368 for (i = 0; i < NDOSPART; i++) 1369 partp[i].dp_flag = 0; 1370 partp[partition-1].dp_flag = ACTIVE; 1371 1372 status = 1; 1373 break; 1374 } 1375 return (status); 1376 } 1377 1378 1379 static int 1380 process_line(char *line) 1381 { 1382 CMD command; 1383 int status = 1; 1384 1385 while (1) 1386 { 1387 parse_config_line(line, &command); 1388 switch (command.cmd) 1389 { 1390 case 0: 1391 /* 1392 * Comment or blank line 1393 */ 1394 break; 1395 case 'g': 1396 /* 1397 * Set geometry 1398 */ 1399 status = process_geometry(&command); 1400 break; 1401 case 'p': 1402 status = process_partition(&command); 1403 break; 1404 case 'a': 1405 status = process_active(&command); 1406 break; 1407 default: 1408 status = 0; 1409 break; 1410 } 1411 break; 1412 } 1413 return (status); 1414 } 1415 1416 1417 static int 1418 read_config(char *config_file) 1419 { 1420 FILE *fp = NULL; 1421 int status = 1; 1422 char buf[1010]; 1423 1424 while (1) /* dirty trick used to insure one exit point for this 1425 function */ 1426 { 1427 if (strcmp(config_file, "-") != 0) 1428 { 1429 /* 1430 * We're not reading from stdin 1431 */ 1432 if ((fp = fopen(config_file, "r")) == NULL) 1433 { 1434 status = 0; 1435 break; 1436 } 1437 } 1438 else 1439 { 1440 fp = stdin; 1441 } 1442 current_line_number = 0; 1443 while (!feof(fp)) 1444 { 1445 if (fgets(buf, sizeof(buf), fp) == NULL) 1446 { 1447 break; 1448 } 1449 ++current_line_number; 1450 status = process_line(buf); 1451 if (status == 0) 1452 { 1453 break; 1454 } 1455 } 1456 break; 1457 } 1458 if (fp) 1459 { 1460 /* 1461 * It doesn't matter if we're reading from stdin, as we've reached EOF 1462 */ 1463 fclose(fp); 1464 } 1465 return (status); 1466 } 1467 1468 1469 static void 1470 reset_boot(void) 1471 { 1472 int i; 1473 struct dos_partition *partp; 1474 1475 init_boot(); 1476 for (i = 0; i < 4; ++i) 1477 { 1478 partp = ((struct dos_partition *) &mboot.parts) + i; 1479 bzero((char *)partp, sizeof (struct dos_partition)); 1480 } 1481 } 1482 1483 static int 1484 sanitize_partition(struct dos_partition *partp) 1485 { 1486 u_int32_t prev_head_boundary, prev_cyl_boundary; 1487 u_int32_t max_end, size, start; 1488 1489 start = partp->dp_start; 1490 size = partp->dp_size; 1491 max_end = start + size; 1492 /* Only allow a zero size if the partition is being marked unused. */ 1493 if (size == 0) { 1494 if (start == 0 && partp->dp_typ == 0) 1495 return (1); 1496 warnx("ERROR: size of partition is zero"); 1497 return (0); 1498 } 1499 /* Return if no adjustment is necessary. */ 1500 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1501 return (1); 1502 1503 if (start == 0) { 1504 warnx("WARNING: partition overlaps with partition table"); 1505 if (ok("Correct this automatically?")) 1506 start = dos_sectors; 1507 } 1508 if (start % dos_sectors != 0) 1509 warnx("WARNING: partition does not start on a head boundary"); 1510 if ((start +size) % dos_sectors != 0) 1511 warnx("WARNING: partition does not end on a cylinder boundary"); 1512 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1513 if (!ok("Correct this automatically?")) 1514 return (1); 1515 1516 /* 1517 * Adjust start upwards, if necessary, to fall on an head boundary. 1518 */ 1519 if (start % dos_sectors != 0) { 1520 prev_head_boundary = start / dos_sectors * dos_sectors; 1521 if (max_end < dos_sectors || 1522 prev_head_boundary >= max_end - dos_sectors) { 1523 /* 1524 * Can't go past end of partition 1525 */ 1526 warnx( 1527 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1528 return (0); 1529 } 1530 start = prev_head_boundary + dos_sectors; 1531 } 1532 1533 /* 1534 * Adjust size downwards, if necessary, to fall on a cylinder 1535 * boundary. 1536 */ 1537 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1538 if (prev_cyl_boundary > start) 1539 size = prev_cyl_boundary - start; 1540 else { 1541 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1542 and end on a cylinder boundary."); 1543 return (0); 1544 } 1545 1546 /* Finally, commit any changes to partp and return. */ 1547 if (start != partp->dp_start) { 1548 warnx("WARNING: adjusting start offset of partition to %u", 1549 (u_int)start); 1550 partp->dp_start = start; 1551 } 1552 if (size != partp->dp_size) { 1553 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1554 partp->dp_size = size; 1555 } 1556 1557 return (1); 1558 } 1559