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 */ 28 29 #include <sys/types.h> 30 #include <sys/diskslice.h> 31 #include <sys/diskmbr.h> 32 #include <sys/ioctl_compat.h> 33 #include <sys/sysctl.h> 34 #include <sys/stat.h> 35 #include <ctype.h> 36 #include <fcntl.h> 37 #include <err.h> 38 #include <fstab.h> 39 #include <errno.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 int iotest; 46 47 #define LBUF 100 48 static char lbuf[LBUF]; 49 50 #define MBRSIGOFF 510 51 52 /* 53 * 54 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 55 * 56 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 57 * Copyright (c) 1989 Robert. V. Baron 58 * Created. 59 */ 60 61 #define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 62 #define Hex(str, ans, tmp) if (hex(str, &tmp, ans)) ans = tmp 63 #define String(str, ans, len) {char *z = ans; char **dflt = &z; if (string(str, dflt)) strncpy(ans, *dflt, len); } 64 65 #define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 66 67 #define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 68 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 69 int secsize = 0; /* the sensed sector size */ 70 71 const char *disk; 72 const char *disks[] = 73 { 74 "/dev/ad0", "/dev/da0", "/dev/vkd0", 0 75 }; 76 77 int cyls, sectors, heads, cylsecs; 78 int64_t disksecs; 79 80 struct mboot 81 { 82 unsigned char padding[2]; /* force the longs to be long aligned */ 83 unsigned char *bootinst; /* boot code */ 84 off_t bootinst_size; 85 struct dos_partition parts[4]; 86 }; 87 struct mboot mboot = {{0}, NULL, 0}; 88 89 #define ACTIVE 0x80 90 #define BOOT_MAGIC 0xAA55 91 92 int dos_cyls; 93 int dos_heads; 94 int dos_sectors; 95 int dos_cylsecs; 96 97 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 98 #define DOSCYL(c) (c & 0xff) 99 #define MAXCYL 1023 100 static int partition = -1; 101 102 103 #define MAX_ARGS 10 104 105 static int current_line_number; 106 107 static int geom_processed = 0; 108 static int part_processed = 0; 109 static int active_processed = 0; 110 111 112 typedef struct cmd { 113 char cmd; 114 int n_args; 115 struct arg { 116 char argtype; 117 long long arg_val; 118 } args[MAX_ARGS]; 119 } CMD; 120 121 122 static int B_flag = 0; /* replace boot code */ 123 static int C_flag = 0; /* use wrapped values for CHS */ 124 static int E_flag = 0; /* Erase through TRIM */ 125 static int I_flag = 0; /* use entire disk for DragonFly */ 126 static int a_flag = 0; /* set active partition */ 127 static char *b_flag = NULL; /* path to boot code */ 128 static int i_flag = 0; /* replace partition data */ 129 static int u_flag = 0; /* update partition data */ 130 static int p_flag = 0; /* operate on a disk image file */ 131 static int s_flag = 0; /* Print a summary and exit */ 132 static int t_flag = 0; /* test only */ 133 static char *f_flag = NULL; /* Read config info from file */ 134 static int v_flag = 0; /* Be verbose */ 135 136 struct part_type 137 { 138 unsigned char type; 139 char *name; 140 }part_types[] = 141 { 142 {0x00, "unused"} 143 ,{0x01, "Primary DOS with 12 bit FAT"} 144 ,{0x02, "XENIX / filesystem"} 145 ,{0x03, "XENIX /usr filesystem"} 146 ,{0x04, "Primary DOS with 16 bit FAT (<= 32MB)"} 147 ,{0x05, "Extended DOS"} 148 ,{0x06, "Primary 'big' DOS (> 32MB)"} 149 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 150 ,{0x08, "AIX filesystem"} 151 ,{0x09, "AIX boot partition or Coherent"} 152 ,{0x0A, "OS/2 Boot Manager or OPUS"} 153 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 154 ,{0x0C, "DOS or Windows 95 with 32 bit FAT, LBA"} 155 ,{0x0E, "Primary 'big' DOS (> 32MB, LBA)"} 156 ,{0x0F, "Extended DOS, LBA"} 157 ,{0x10, "OPUS"} 158 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 159 ,{0x12, "Compaq diagnostics"} 160 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 161 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 162 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 163 ,{0x18, "AST Windows swapfile"} 164 ,{0x24, "NEC DOS"} 165 ,{0x39, "plan9"} 166 ,{0x3C, "PartitionMagic recovery"} 167 ,{0x40, "VENIX 286"} 168 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 169 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 170 ,{0x43, "Linux native (sharing disk with DRDOS)"} 171 ,{0x4D, "QNX 4.2 Primary"} 172 ,{0x4E, "QNX 4.2 Secondary"} 173 ,{0x4F, "QNX 4.2 Tertiary"} 174 ,{0x50, "DM"} 175 ,{0x51, "DM"} 176 ,{0x52, "CP/M or Microport SysV/AT"} 177 ,{0x53, "DM6 Aux3"} 178 ,{0x54, "DM6"} 179 ,{0x55, "EZ-Drive (disk manager)"} 180 ,{0x56, "GB"} 181 ,{0x5C, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 182 ,{0x61, "Speed"} 183 ,{0x63, "ISC UNIX, other System V/386, GNU HURD or Mach"} 184 ,{0x64, "Novell Netware 2.xx"} 185 ,{0x65, "Novell Netware 3.xx"} 186 ,{0x70, "DiskSecure Multi-Boot"} 187 ,{0x75, "PCIX"} 188 ,{0x77, "QNX4.x"} 189 ,{0x78, "QNX4.x 2nd part"} 190 ,{0x79, "QNX4.x 3rd part"} 191 ,{0x80, "Minix 1.1 ... 1.4a"} 192 ,{0x81, "Minix 1.4b ... 1.5.10"} 193 ,{0x82, "Linux swap or Solaris x86"} 194 ,{0x83, "Linux filesystem"} 195 ,{0x84, "OS/2 hidden C: drive"} 196 ,{0x85, "Linux extended"} 197 ,{0x86, "NTFS volume set??"} 198 ,{0x87, "NTFS volume set??"} 199 ,{0x93, "Amoeba filesystem"} 200 ,{0x94, "Amoeba bad block table"} 201 ,{0x9F, "BSD/OS"} 202 ,{0xA0, "Suspend to Disk"} 203 ,{0xA5, "DragonFly/FreeBSD/NetBSD/386BSD"} 204 ,{0xA6, "OpenBSD"} 205 ,{0xA7, "NEXTSTEP"} 206 ,{0xA9, "NetBSD"} 207 ,{0xAC, "IBM JFS"} 208 ,{0xB7, "BSDI BSD/386 filesystem"} 209 ,{0xB8, "BSDI BSD/386 swap"} 210 ,{0xBE, "Solaris x86 boot"} 211 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 212 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 213 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 214 ,{0xC7, "Syrinx"} 215 ,{0xDB, "Concurrent CPM or C.DOS or CTOS"} 216 ,{0xE1, "Speed"} 217 ,{0xE3, "Speed"} 218 ,{0xE4, "Speed"} 219 ,{0xEB, "BeOS file system"} 220 ,{0xEE, "EFI GPT"} 221 ,{0xEF, "EFI System Partition"} 222 ,{0xF1, "Speed"} 223 ,{0xF2, "DOS 3.3+ Secondary"} 224 ,{0xF4, "Speed"} 225 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 226 ,{0xFF, "BBT (Bad Blocks Table)"} 227 }; 228 229 static void print_s0(int which); 230 static void print_part(int i); 231 static void init_sector0(unsigned long start); 232 static void init_boot(void); 233 static void change_part(int i); 234 static void print_params(); 235 static void change_active(int which); 236 static void change_code(); 237 static void get_params_to_use(); 238 static void dos(struct dos_partition *partp); 239 static int open_disk(int u_flag); 240 static void erase_partition(int i); 241 static ssize_t read_disk(off_t sector, void *buf); 242 static ssize_t write_disk(off_t sector, void *buf); 243 static int get_params(); 244 static int read_s0(); 245 static int write_s0(); 246 static int ok(char *str); 247 static int decimal(char *str, int *num, int deflt); 248 static char *get_type(int type); 249 static int read_config(char *config_file); 250 static void reset_boot(void); 251 static int sanitize_partition(struct dos_partition *); 252 static void usage(void); 253 #if 0 254 static int hex(char *str, int *num, int deflt); 255 static int string(char *str, char **ans); 256 #endif 257 258 259 int 260 main(int argc, char *argv[]) 261 { 262 int c, i; 263 264 while ((c = getopt(argc, argv, "BCEIab:f:p:istuv1234")) != -1) 265 switch (c) { 266 case 'B': 267 B_flag = 1; 268 break; 269 case 'C': 270 C_flag = 1; 271 break; 272 case 'E': 273 E_flag = 1; 274 break; 275 case 'I': 276 I_flag = 1; 277 break; 278 case 'a': 279 a_flag = 1; 280 break; 281 case 'b': 282 b_flag = optarg; 283 break; 284 case 'f': 285 f_flag = optarg; 286 break; 287 case 'p': 288 disk = optarg; 289 p_flag = 1; 290 break; 291 case 'i': 292 i_flag = 1; 293 break; 294 case 's': 295 s_flag = 1; 296 break; 297 case 't': 298 t_flag = 1; 299 break; 300 case 'u': 301 u_flag = 1; 302 break; 303 case 'v': 304 v_flag = 1; 305 break; 306 case '1': 307 case '2': 308 case '3': 309 case '4': 310 partition = c - '0'; 311 break; 312 default: 313 usage(); 314 } 315 if (f_flag || i_flag) 316 u_flag = 1; 317 if (t_flag) 318 v_flag = 1; 319 argc -= optind; 320 argv += optind; 321 322 if (argc > 0) { 323 disk = getdevpath(argv[0], 0); 324 if (open_disk(u_flag) < 0) 325 err(1, "cannot open disk %s", disk); 326 } else if (disk == NULL) { 327 int rv = 0; 328 329 for(i = 0; disks[i]; i++) 330 { 331 disk = disks[i]; 332 rv = open_disk(u_flag); 333 if(rv != -2) break; 334 } 335 if(rv < 0) 336 err(1, "cannot open any disk"); 337 } else { 338 if (open_disk(u_flag) < 0) 339 err(1, "cannot open disk %s", disk); 340 } 341 342 /* (abu)use mboot.bootinst to probe for the sector size */ 343 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 344 err(1, "cannot allocate buffer to determine disk sector size"); 345 read_disk(0, mboot.bootinst); 346 free(mboot.bootinst); 347 mboot.bootinst = NULL; 348 349 if (s_flag) 350 { 351 int i; 352 struct dos_partition *partp; 353 354 if (read_s0()) 355 err(1, "read_s0"); 356 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 357 dos_sectors); 358 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 359 for (i = 0; i < NDOSPART; i++) { 360 partp = ((struct dos_partition *) &mboot.parts) + i; 361 if (partp->dp_start == 0 && partp->dp_size == 0) 362 continue; 363 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 364 (u_long) partp->dp_start, 365 (u_long) partp->dp_size, partp->dp_typ, 366 partp->dp_flag); 367 } 368 exit(0); 369 } 370 371 printf("******* Working on device %s *******\n",disk); 372 373 if (I_flag) 374 { 375 struct dos_partition *partp; 376 377 read_s0(); 378 reset_boot(); 379 partp = (struct dos_partition *) (&mboot.parts[0]); 380 partp->dp_typ = DOSPTYP_386BSD; 381 partp->dp_flag = ACTIVE; 382 partp->dp_start = dos_sectors; 383 if (disksecs - dos_sectors > 0xFFFFFFFFU) { 384 printf("Warning: Ending logical block > 2TB, using max value\n"); 385 partp->dp_size = 0xFFFFFFFFU; 386 } else { 387 partp->dp_size = (disksecs / dos_cylsecs) * 388 dos_cylsecs - dos_sectors; 389 } 390 dos(partp); 391 if (v_flag) 392 print_s0(-1); 393 394 if (E_flag) { 395 /* Trim now if we're using the entire device */ 396 erase_partition(0); 397 } 398 399 if (!t_flag) 400 write_s0(); 401 exit(0); 402 } 403 if (f_flag) 404 { 405 if (read_s0() || i_flag) 406 { 407 reset_boot(); 408 } 409 410 if (!read_config(f_flag)) 411 { 412 exit(1); 413 } 414 if (v_flag) 415 { 416 print_s0(-1); 417 } 418 if (!t_flag) 419 { 420 write_s0(); 421 } 422 } 423 else 424 { 425 if(u_flag) 426 { 427 get_params_to_use(); 428 } 429 else 430 { 431 print_params(); 432 } 433 434 if (read_s0()) 435 init_sector0(dos_sectors); 436 437 printf("Media sector size is %d\n", secsize); 438 printf("Warning: BIOS sector numbering starts with sector 1\n"); 439 printf("Information from DOS bootblock is:\n"); 440 if (partition == -1) 441 for (i = 1; i <= NDOSPART; i++) 442 change_part(i); 443 else 444 change_part(partition); 445 446 if (u_flag || a_flag) 447 change_active(partition); 448 449 if (B_flag) 450 change_code(); 451 452 if (u_flag || a_flag || B_flag) { 453 if (!t_flag) { 454 printf("\nWe haven't changed the partition table yet. "); 455 printf("This is your last chance.\n"); 456 } 457 print_s0(-1); 458 if (!t_flag) { 459 if (ok("Should we write new partition table?")) { 460 if (E_flag && u_flag) { 461 /* 462 * Trim now because we've committed to 463 * updating the partition. 464 */ 465 if (partition == -1) 466 for (i = 0; i < NDOSPART; i++) 467 erase_partition(i); 468 else 469 erase_partition(partition); 470 } 471 write_s0(); 472 } 473 } 474 else 475 { 476 printf("\n-t flag specified -- partition table not written.\n"); 477 } 478 } 479 } 480 481 exit(0); 482 } 483 484 static void 485 usage(void) 486 { 487 fprintf(stderr, "%s%s", 488 "usage: fdisk [-BCEIaistu] [-b bootcode] [-p diskimage] [-1234] [disk]\n", 489 " fdisk -f configfile [-itv] [disk]\n"); 490 exit(1); 491 } 492 493 static void 494 print_s0(int which) 495 { 496 int i; 497 498 print_params(); 499 printf("Information from DOS bootblock is:\n"); 500 if (which == -1) 501 for (i = 1; i <= NDOSPART; i++) 502 printf("%d: ", i), print_part(i); 503 else 504 print_part(which); 505 } 506 507 static struct dos_partition mtpart = { 0 }; 508 509 static void 510 print_part(int i) 511 { 512 struct dos_partition *partp; 513 u_int64_t part_mb; 514 515 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 516 517 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 518 printf("<UNUSED>\n"); 519 return; 520 } 521 /* 522 * Be careful not to overflow. 523 */ 524 part_mb = partp->dp_size; 525 part_mb *= secsize; 526 part_mb /= (1024 * 1024); 527 printf("sysid %d,(%s)\n", partp->dp_typ, get_type(partp->dp_typ)); 528 printf(" start %lu, size %lu (%jd Meg), flag %x%s\n", 529 (u_long)partp->dp_start, 530 (u_long)partp->dp_size, 531 (intmax_t)part_mb, 532 partp->dp_flag, 533 partp->dp_flag == ACTIVE ? " (active)" : ""); 534 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 535 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 536 ,partp->dp_shd 537 ,DPSECT(partp->dp_ssect) 538 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 539 ,partp->dp_ehd 540 ,DPSECT(partp->dp_esect)); 541 } 542 543 544 static void 545 init_boot(void) 546 { 547 const char *fname; 548 int fd, n; 549 struct stat sb; 550 551 fname = b_flag ? b_flag : "/boot/mbr"; 552 if ((fd = open(fname, O_RDONLY)) == -1 || 553 fstat(fd, &sb) == -1) 554 err(1, "%s", fname); 555 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 556 errx(1, "%s: length must be a multiple of sector size", fname); 557 if (mboot.bootinst != NULL) 558 free(mboot.bootinst); 559 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 560 errx(1, "%s: unable to allocate read buffer", fname); 561 if ((n = read(fd, mboot.bootinst, mboot.bootinst_size)) == -1 || 562 close(fd)) 563 err(1, "%s", fname); 564 if (n != mboot.bootinst_size) 565 errx(1, "%s: short read", fname); 566 } 567 568 569 static void 570 init_sector0(unsigned long start) 571 { 572 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]); 573 574 init_boot(); 575 576 partp->dp_typ = DOSPTYP_386BSD; 577 partp->dp_flag = ACTIVE; 578 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 579 if(start == 0) 580 start = dos_sectors; 581 partp->dp_start = start; 582 if (disksecs - start > 0xFFFFFFFFU) { 583 printf("Warning: Ending logical block > 2TB, using max value\n"); 584 partp->dp_size = 0xFFFFFFFFU; 585 } else { 586 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 587 } 588 589 dos(partp); 590 } 591 592 static void 593 change_part(int i) 594 { 595 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 596 597 printf("The data for partition %d is:\n", i); 598 print_part(i); 599 600 if (u_flag && ok("Do you want to change it?")) { 601 int tmp; 602 603 if (i_flag) { 604 bzero((char *)partp, sizeof (struct dos_partition)); 605 if (i == 4) { 606 init_sector0(1); 607 printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n"); 608 print_part(i); 609 } 610 } 611 612 do { 613 Decimal("sysid (165=DragonFly)", partp->dp_typ, tmp); 614 Decimal("start", partp->dp_start, tmp); 615 Decimal("size", partp->dp_size, tmp); 616 if (!sanitize_partition(partp)) { 617 warnx("ERROR: failed to adjust; setting sysid to 0"); 618 partp->dp_typ = 0; 619 } 620 621 if (ok("Explicitly specify beg/end address ?")) 622 { 623 int tsec,tcyl,thd; 624 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 625 thd = partp->dp_shd; 626 tsec = DPSECT(partp->dp_ssect); 627 Decimal("beginning cylinder", tcyl, tmp); 628 Decimal("beginning head", thd, tmp); 629 Decimal("beginning sector", tsec, tmp); 630 if (tcyl > MAXCYL && C_flag == 0) { 631 printf("Warning: starting cylinder wraps, using all 1's\n"); 632 partp->dp_scyl = -1; 633 partp->dp_ssect = -1; 634 partp->dp_shd = -1; 635 } else { 636 partp->dp_scyl = DOSCYL(tcyl); 637 partp->dp_ssect = DOSSECT(tsec,tcyl); 638 partp->dp_shd = thd; 639 } 640 641 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 642 thd = partp->dp_ehd; 643 tsec = DPSECT(partp->dp_esect); 644 Decimal("ending cylinder", tcyl, tmp); 645 Decimal("ending head", thd, tmp); 646 Decimal("ending sector", tsec, tmp); 647 if (tcyl > MAXCYL && C_flag == 0) { 648 printf("Warning: ending cylinder wraps, using all 1's\n"); 649 partp->dp_ecyl = -1; 650 partp->dp_esect = -1; 651 partp->dp_ehd = -1; 652 } else { 653 partp->dp_ecyl = DOSCYL(tcyl); 654 partp->dp_esect = DOSSECT(tsec,tcyl); 655 partp->dp_ehd = thd; 656 } 657 } else 658 dos(partp); 659 660 print_part(i); 661 } while (!ok("Are we happy with this entry?")); 662 } 663 } 664 665 static void 666 print_params(void) 667 { 668 printf("parameters extracted from device are:\n"); 669 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 670 ,cyls,heads,sectors,cylsecs); 671 if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255)) 672 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 673 printf("parameters to be used for BIOS calculations are:\n"); 674 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 675 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 676 } 677 678 static void 679 change_active(int which) 680 { 681 struct dos_partition *partp = &mboot.parts[0]; 682 int active, i, new, tmp; 683 684 active = -1; 685 for (i = 0; i < NDOSPART; i++) { 686 if ((partp[i].dp_flag & ACTIVE) == 0) 687 continue; 688 printf("Partition %d is marked active\n", i + 1); 689 if (active == -1) 690 active = i + 1; 691 } 692 if (a_flag && which != -1) 693 active = which; 694 else if (active == -1) 695 active = 1; 696 697 if (!ok("Do you want to change the active partition?")) 698 return; 699 setactive: 700 do { 701 new = active; 702 Decimal("active partition", new, tmp); 703 if (new < 1 || new > 4) { 704 printf("Active partition number must be in range 1-4." 705 " Try again.\n"); 706 goto setactive; 707 } 708 active = new; 709 } while (!ok("Are you happy with this choice")); 710 for (i = 0; i < NDOSPART; i++) 711 partp[i].dp_flag = 0; 712 if (active > 0 && active <= NDOSPART) 713 partp[active-1].dp_flag = ACTIVE; 714 } 715 716 static void 717 change_code(void) 718 { 719 if (ok("Do you want to change the boot code?")) 720 init_boot(); 721 } 722 723 void 724 get_params_to_use(void) 725 { 726 int tmp; 727 print_params(); 728 if (ok("Do you want to change our idea of what BIOS thinks ?")) 729 { 730 do 731 { 732 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 733 Decimal("BIOS's idea of #heads", dos_heads, tmp); 734 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 735 dos_cylsecs = dos_heads * dos_sectors; 736 print_params(); 737 } 738 while(!ok("Are you happy with this choice")); 739 } 740 } 741 742 743 /***********************************************\ 744 * Change real numbers into strange dos numbers * 745 \***********************************************/ 746 static void 747 dos(struct dos_partition *partp) 748 { 749 int cy, sec; 750 u_int32_t end; 751 752 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 753 memcpy(partp, &mtpart, sizeof(*partp)); 754 return; 755 } 756 757 /* Start c/h/s. */ 758 cy = partp->dp_start / dos_cylsecs; 759 sec = partp->dp_start % dos_sectors + 1; 760 if (cy > MAXCYL && C_flag == 0) { 761 printf("Warning: starting cylinder wraps, using all 1's\n"); 762 partp->dp_shd = -1; 763 partp->dp_scyl = -1; 764 partp->dp_ssect = -1; 765 } else { 766 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 767 partp->dp_scyl = DOSCYL(cy); 768 partp->dp_ssect = DOSSECT(sec, cy); 769 } 770 771 /* End c/h/s. */ 772 end = partp->dp_start + partp->dp_size - 1; 773 cy = end / dos_cylsecs; 774 sec = end % dos_sectors + 1; 775 if (cy > MAXCYL && C_flag == 0) { 776 printf("Warning: ending cylinder wraps, using all 1's\n"); 777 partp->dp_ehd = -1; 778 partp->dp_ecyl = -1; 779 partp->dp_esect = -1; 780 } else { 781 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 782 partp->dp_ecyl = DOSCYL(cy); 783 partp->dp_esect = DOSSECT(sec, cy); 784 } 785 } 786 787 int fd; 788 789 static void 790 erase_partition(int i) 791 { 792 struct dos_partition *partp; 793 off_t ioarg[2]; 794 795 char sysctl_name[64]; 796 int trim_enabled = 0; 797 size_t olen = sizeof(trim_enabled); 798 char *dev_name = strdup(disk); 799 800 dev_name = strtok(dev_name + strlen("/dev/da"),"s"); 801 sprintf(sysctl_name, "kern.cam.da.%s.trim_enabled", dev_name); 802 sysctlbyname(sysctl_name, &trim_enabled, &olen, NULL, 0); 803 if(errno == ENOENT) { 804 printf("Device:%s does not support the TRIM command\n", disk); 805 usage(); 806 } 807 if(!trim_enabled) { 808 printf("Erase device option selected, but sysctl (%s) " 809 "is not enabled\n",sysctl_name); 810 usage(); 811 } 812 partp = ((struct dos_partition *) &mboot.parts) + i; 813 printf("erase sectors:%u %u\n", 814 partp->dp_start, 815 partp->dp_size); 816 817 /* Trim the Device */ 818 ioarg[0] = partp->dp_start; 819 ioarg[0] *=secsize; 820 ioarg[1] = partp->dp_size; 821 ioarg[1] *=secsize; 822 823 if (ioctl(fd, IOCTLTRIM, ioarg) < 0) { 824 printf("Device trim failed\n"); 825 usage (); 826 } 827 } 828 829 /* Getting device status */ 830 831 static int 832 open_disk(int u_flag) 833 { 834 struct stat st; 835 836 if (stat(disk, &st) == -1) { 837 if (errno == ENOENT) 838 return -2; 839 warnx("can't get file status of %s", disk); 840 return -1; 841 } 842 if ( !(st.st_mode & S_IFCHR) && p_flag == 0 ) 843 warnx("device %s is not character special", disk); 844 if ((fd = open(disk, 845 a_flag || I_flag || B_flag || u_flag ? O_RDWR : O_RDONLY)) == -1) { 846 if(errno == ENXIO) 847 return -2; 848 warnx("can't open device %s", disk); 849 return -1; 850 } 851 if (get_params() == -1) { 852 warnx("can't get disk parameters on %s", disk); 853 return -1; 854 } 855 return fd; 856 } 857 858 static ssize_t 859 read_disk(off_t sector, void *buf) 860 { 861 lseek(fd,(sector * 512), 0); 862 if( secsize == 0 ) 863 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 864 { 865 /* try the read */ 866 int size = read(fd, buf, secsize); 867 if( size == secsize ) 868 /* it worked so return */ 869 return secsize; 870 } 871 else 872 return read( fd, buf, secsize ); 873 874 /* we failed to read at any of the sizes */ 875 return -1; 876 } 877 878 static ssize_t 879 write_disk(off_t sector, void *buf) 880 { 881 lseek(fd,(sector * 512), 0); 882 /* write out in the size that the read_disk found worked */ 883 return write(fd, buf, secsize); 884 } 885 886 static int 887 get_params(void) 888 { 889 struct partinfo partinfo; /* disk parameters */ 890 struct stat st; 891 892 /* 893 * NOTE: When faking up the CHS for a file image (e.g. for USB), 894 * we must use max values. If we do not then an overflowed 895 * cylinder count will, by convention, set the CHS fields to 896 * all 1's. The heads and sectors in the CHS fields will then 897 * exceed the basic geometry which can cause BIOSes to brick. 898 */ 899 if (ioctl(fd, DIOCGPART, &partinfo) == -1) { 900 if (p_flag && fstat(fd, &st) == 0 && st.st_size) { 901 sectors = 63; 902 heads = 255; 903 cylsecs = heads * sectors; 904 cyls = st.st_size / 512 / cylsecs; 905 } else { 906 warnx("can't get disk parameters on %s; supplying dummy ones", 907 disk); 908 heads = 1; 909 cylsecs = heads * sectors; 910 } 911 } else { 912 cyls = partinfo.d_ncylinders; 913 heads = partinfo.d_nheads; 914 sectors = partinfo.d_secpertrack; 915 cylsecs = heads * sectors; 916 secsize = partinfo.media_blksize; 917 } 918 dos_cyls = cyls; 919 dos_heads = heads; 920 dos_sectors = sectors; 921 dos_cylsecs = cylsecs; 922 disksecs = (int64_t)cyls * heads * sectors; 923 return (disksecs); 924 } 925 926 927 static int 928 read_s0(void) 929 { 930 mboot.bootinst_size = secsize; 931 if (mboot.bootinst != NULL) 932 free(mboot.bootinst); 933 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 934 warnx("unable to allocate buffer to read fdisk " 935 "partition table"); 936 return -1; 937 } 938 if (read_disk(0, mboot.bootinst) == -1) { 939 warnx("can't read fdisk partition table"); 940 return -1; 941 } 942 if (*(uint16_t *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 943 warnx("invalid fdisk partition table found"); 944 /* So should we initialize things */ 945 return -1; 946 } 947 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 948 return 0; 949 } 950 951 static int 952 write_s0(void) 953 { 954 #ifdef NOT_NOW 955 int flag; 956 #endif 957 int sector; 958 959 if (iotest) { 960 print_s0(-1); 961 return 0; 962 } 963 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 964 /* 965 * write enable label sector before write (if necessary), 966 * disable after writing. 967 * needed if the disklabel protected area also protects 968 * sector 0. (e.g. empty disk) 969 */ 970 #ifdef NOT_NOW 971 flag = 1; 972 if (ioctl(fd, DIOCWLABEL, &flag) < 0) 973 warn("ioctl DIOCWLABEL"); 974 #endif 975 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 976 if (write_disk(sector, 977 &mboot.bootinst[sector * secsize]) == -1) { 978 warn("can't write fdisk partition table"); 979 return -1; 980 #ifdef NOT_NOW 981 flag = 0; 982 ioctl(fd, DIOCWLABEL, &flag); 983 #endif 984 } 985 #ifdef NOT_NOW 986 flag = 0; 987 ioctl(fd, DIOCWLABEL, &flag); 988 #endif 989 return(0); 990 } 991 992 993 static int 994 ok(char *str) 995 { 996 printf("%s [n] ", str); 997 fflush(stdout); 998 if (fgets(lbuf, LBUF, stdin) == NULL) 999 exit(1); 1000 lbuf[strlen(lbuf)-1] = 0; 1001 1002 if (*lbuf && 1003 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 1004 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 1005 return 1; 1006 else 1007 return 0; 1008 } 1009 1010 static int 1011 decimal(char *str, int *num, int deflt) 1012 { 1013 int acc = 0, c; 1014 char *cp; 1015 1016 while (1) { 1017 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 1018 fflush(stdout); 1019 if (fgets(lbuf, LBUF, stdin) == NULL) 1020 exit(1); 1021 lbuf[strlen(lbuf)-1] = 0; 1022 1023 if (!*lbuf) 1024 return 0; 1025 1026 cp = lbuf; 1027 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1028 if (!c) 1029 return 0; 1030 while ((c = *cp++)) { 1031 if (c <= '9' && c >= '0') 1032 acc = acc * 10 + c - '0'; 1033 else 1034 break; 1035 } 1036 if (c == ' ' || c == '\t') 1037 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1038 if (!c) { 1039 *num = acc; 1040 return 1; 1041 } else 1042 printf("%s is an invalid decimal number. Try again.\n", 1043 lbuf); 1044 } 1045 1046 } 1047 1048 #if 0 1049 static int 1050 hex(char *str, int *num, int deflt) 1051 { 1052 int acc = 0, c; 1053 char *cp; 1054 1055 while (1) { 1056 printf("Supply a hex value for \"%s\" [%x] ", str, deflt); 1057 fgets(lbuf, LBUF, stdin); 1058 lbuf[strlen(lbuf)-1] = 0; 1059 1060 if (!*lbuf) 1061 return 0; 1062 1063 cp = lbuf; 1064 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1065 if (!c) 1066 return 0; 1067 while ((c = *cp++)) { 1068 if (c <= '9' && c >= '0') 1069 acc = (acc << 4) + c - '0'; 1070 else if (c <= 'f' && c >= 'a') 1071 acc = (acc << 4) + c - 'a' + 10; 1072 else if (c <= 'F' && c >= 'A') 1073 acc = (acc << 4) + c - 'A' + 10; 1074 else 1075 break; 1076 } 1077 if (c == ' ' || c == '\t') 1078 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1079 if (!c) { 1080 *num = acc; 1081 return 1; 1082 } else 1083 printf("%s is an invalid hex number. Try again.\n", 1084 lbuf); 1085 } 1086 1087 } 1088 1089 static int 1090 string(char *str, char **ans) 1091 { 1092 int c; 1093 char *cp = lbuf; 1094 1095 while (1) { 1096 printf("Supply a string value for \"%s\" [%s] ", str, *ans); 1097 fgets(lbuf, LBUF, stdin); 1098 lbuf[strlen(lbuf)-1] = 0; 1099 1100 if (!*lbuf) 1101 return 0; 1102 1103 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 1104 if (c == '"') { 1105 c = *++cp; 1106 *ans = cp; 1107 while ((c = *cp) && c != '"') cp++; 1108 } else { 1109 *ans = cp; 1110 while ((c = *cp) && c != ' ' && c != '\t') cp++; 1111 } 1112 1113 if (c) 1114 *cp = 0; 1115 return 1; 1116 } 1117 } 1118 #endif 1119 1120 static char * 1121 get_type(int type) 1122 { 1123 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 1124 int counter = 0; 1125 struct part_type *ptr = part_types; 1126 1127 1128 while(counter < numentries) 1129 { 1130 if(ptr->type == type) 1131 { 1132 return(ptr->name); 1133 } 1134 ptr++; 1135 counter++; 1136 } 1137 return("unknown"); 1138 } 1139 1140 1141 static void 1142 parse_config_line(char *line, CMD *command) 1143 { 1144 char *cp, *end; 1145 1146 cp = line; 1147 while (1) /* dirty trick used to insure one exit point for this 1148 function */ 1149 { 1150 memset(command, 0, sizeof(*command)); 1151 1152 while (isspace(*cp)) ++cp; 1153 if (*cp == '\0' || *cp == '#') 1154 { 1155 break; 1156 } 1157 command->cmd = *cp++; 1158 1159 /* 1160 * Parse args 1161 */ 1162 while (1) 1163 { 1164 while (isspace(*cp)) ++cp; 1165 if (*cp == '#') 1166 { 1167 break; /* found comment */ 1168 } 1169 if (isalpha(*cp)) 1170 { 1171 command->args[command->n_args].argtype = *cp++; 1172 } 1173 if (!isdigit(*cp)) 1174 { 1175 break; /* assume end of line */ 1176 } 1177 end = NULL; 1178 command->args[command->n_args].arg_val = strtoll(cp, &end, 0); 1179 if (cp == end) 1180 { 1181 break; /* couldn't parse number */ 1182 } 1183 cp = end; 1184 command->n_args++; 1185 } 1186 break; 1187 } 1188 } 1189 1190 1191 static int 1192 process_geometry(CMD *command) 1193 { 1194 int status = 1, i; 1195 1196 while (1) 1197 { 1198 geom_processed = 1; 1199 if (part_processed) 1200 { 1201 warnx( 1202 "ERROR line %d: the geometry specification line must occur before\n\ 1203 all partition specifications", 1204 current_line_number); 1205 status = 0; 1206 break; 1207 } 1208 if (command->n_args != 3) 1209 { 1210 warnx("ERROR line %d: incorrect number of geometry args", 1211 current_line_number); 1212 status = 0; 1213 break; 1214 } 1215 dos_cyls = -1; 1216 dos_heads = -1; 1217 dos_sectors = -1; 1218 for (i = 0; i < 3; ++i) 1219 { 1220 switch (command->args[i].argtype) 1221 { 1222 case 'c': 1223 dos_cyls = command->args[i].arg_val; 1224 break; 1225 case 'h': 1226 dos_heads = command->args[i].arg_val; 1227 break; 1228 case 's': 1229 dos_sectors = command->args[i].arg_val; 1230 break; 1231 default: 1232 warnx( 1233 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1234 current_line_number, command->args[i].argtype, 1235 command->args[i].argtype); 1236 status = 0; 1237 break; 1238 } 1239 } 1240 if (status == 0) 1241 { 1242 break; 1243 } 1244 1245 dos_cylsecs = dos_heads * dos_sectors; 1246 1247 /* 1248 * Do sanity checks on parameter values 1249 */ 1250 if (dos_cyls < 0) 1251 { 1252 warnx("ERROR line %d: number of cylinders not specified", 1253 current_line_number); 1254 status = 0; 1255 } 1256 if (dos_cyls == 0 || dos_cyls > 1024) 1257 { 1258 warnx( 1259 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1260 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1261 is dedicated to DragonFly)", 1262 current_line_number, dos_cyls); 1263 } 1264 1265 if (dos_heads < 0) 1266 { 1267 warnx("ERROR line %d: number of heads not specified", 1268 current_line_number); 1269 status = 0; 1270 } 1271 else if (dos_heads < 1 || dos_heads > 256) 1272 { 1273 warnx("ERROR line %d: number of heads must be within (1-256)", 1274 current_line_number); 1275 status = 0; 1276 } 1277 1278 if (dos_sectors < 0) 1279 { 1280 warnx("ERROR line %d: number of sectors not specified", 1281 current_line_number); 1282 status = 0; 1283 } 1284 else if (dos_sectors < 1 || dos_sectors > 63) 1285 { 1286 warnx("ERROR line %d: number of sectors must be within (1-63)", 1287 current_line_number); 1288 status = 0; 1289 } 1290 1291 break; 1292 } 1293 return (status); 1294 } 1295 1296 1297 static int 1298 process_partition(CMD *command) 1299 { 1300 int status = 0, partition; 1301 u_int32_t prev_head_boundary, prev_cyl_boundary; 1302 u_int32_t adj_size, max_end; 1303 struct dos_partition *partp; 1304 1305 while (1) 1306 { 1307 part_processed = 1; 1308 if (command->n_args != 4) 1309 { 1310 warnx("ERROR line %d: incorrect number of partition args", 1311 current_line_number); 1312 break; 1313 } 1314 partition = command->args[0].arg_val; 1315 if (partition < 1 || partition > 4) 1316 { 1317 warnx("ERROR line %d: invalid partition number %d", 1318 current_line_number, partition); 1319 break; 1320 } 1321 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1322 bzero((char *)partp, sizeof (struct dos_partition)); 1323 partp->dp_typ = command->args[1].arg_val; 1324 partp->dp_start = command->args[2].arg_val; 1325 partp->dp_size = command->args[3].arg_val; 1326 max_end = partp->dp_start + partp->dp_size; 1327 1328 if (partp->dp_typ == 0) 1329 { 1330 /* 1331 * Get out, the partition is marked as unused. 1332 */ 1333 /* 1334 * Insure that it's unused. 1335 */ 1336 bzero((char *)partp, sizeof (struct dos_partition)); 1337 status = 1; 1338 break; 1339 } 1340 1341 /* 1342 * Adjust start upwards, if necessary, to fall on an head boundary. 1343 */ 1344 if (partp->dp_start % dos_sectors != 0) 1345 { 1346 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1347 if (max_end < dos_sectors || 1348 prev_head_boundary > max_end - dos_sectors) 1349 { 1350 /* 1351 * Can't go past end of partition 1352 */ 1353 warnx( 1354 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1355 a head boundary", 1356 current_line_number, partition); 1357 break; 1358 } 1359 warnx( 1360 "WARNING: adjusting start offset of partition %d\n\ 1361 from %u to %u, to fall on a head boundary", 1362 partition, (u_int)partp->dp_start, 1363 (u_int)(prev_head_boundary + dos_sectors)); 1364 partp->dp_start = prev_head_boundary + dos_sectors; 1365 } 1366 1367 /* 1368 * Adjust size downwards, if necessary, to fall on a cylinder 1369 * boundary. 1370 */ 1371 prev_cyl_boundary = 1372 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1373 if (prev_cyl_boundary > partp->dp_start) 1374 adj_size = prev_cyl_boundary - partp->dp_start; 1375 else 1376 { 1377 warnx( 1378 "ERROR: could not adjust partition to start on a head boundary\n\ 1379 and end on a cylinder boundary."); 1380 return (0); 1381 } 1382 if (adj_size != partp->dp_size) 1383 { 1384 warnx( 1385 "WARNING: adjusting size of partition %d from %u to %u\n\ 1386 to end on a cylinder boundary", 1387 partition, (u_int)partp->dp_size, (u_int)adj_size); 1388 partp->dp_size = adj_size; 1389 } 1390 if (partp->dp_size == 0) 1391 { 1392 warnx("ERROR line %d: size of partition %d is zero", 1393 current_line_number, partition); 1394 break; 1395 } 1396 1397 dos(partp); 1398 status = 1; 1399 break; 1400 } 1401 return (status); 1402 } 1403 1404 1405 static int 1406 process_active(CMD *command) 1407 { 1408 int status = 0, partition, i; 1409 struct dos_partition *partp; 1410 1411 while (1) 1412 { 1413 active_processed = 1; 1414 if (command->n_args != 1) 1415 { 1416 warnx("ERROR line %d: incorrect number of active args", 1417 current_line_number); 1418 status = 0; 1419 break; 1420 } 1421 partition = command->args[0].arg_val; 1422 if (partition < 1 || partition > 4) 1423 { 1424 warnx("ERROR line %d: invalid partition number %d", 1425 current_line_number, partition); 1426 break; 1427 } 1428 /* 1429 * Reset active partition 1430 */ 1431 partp = ((struct dos_partition *) &mboot.parts); 1432 for (i = 0; i < NDOSPART; i++) 1433 partp[i].dp_flag = 0; 1434 partp[partition-1].dp_flag = ACTIVE; 1435 1436 status = 1; 1437 break; 1438 } 1439 return (status); 1440 } 1441 1442 1443 static int 1444 process_line(char *line) 1445 { 1446 CMD command; 1447 int status = 1; 1448 1449 while (1) 1450 { 1451 parse_config_line(line, &command); 1452 switch (command.cmd) 1453 { 1454 case 0: 1455 /* 1456 * Comment or blank line 1457 */ 1458 break; 1459 case 'g': 1460 /* 1461 * Set geometry 1462 */ 1463 status = process_geometry(&command); 1464 break; 1465 case 'p': 1466 status = process_partition(&command); 1467 break; 1468 case 'a': 1469 status = process_active(&command); 1470 break; 1471 default: 1472 status = 0; 1473 break; 1474 } 1475 break; 1476 } 1477 return (status); 1478 } 1479 1480 1481 static int 1482 read_config(char *config_file) 1483 { 1484 FILE *fp = NULL; 1485 int status = 1; 1486 char buf[1010]; 1487 1488 while (1) /* dirty trick used to insure one exit point for this 1489 function */ 1490 { 1491 if (strcmp(config_file, "-") != 0) 1492 { 1493 /* 1494 * We're not reading from stdin 1495 */ 1496 if ((fp = fopen(config_file, "r")) == NULL) 1497 { 1498 status = 0; 1499 break; 1500 } 1501 } 1502 else 1503 { 1504 fp = stdin; 1505 } 1506 current_line_number = 0; 1507 while (!feof(fp)) 1508 { 1509 if (fgets(buf, sizeof(buf), fp) == NULL) 1510 { 1511 break; 1512 } 1513 ++current_line_number; 1514 status = process_line(buf); 1515 if (status == 0) 1516 { 1517 break; 1518 } 1519 } 1520 break; 1521 } 1522 if (fp) 1523 { 1524 /* 1525 * It doesn't matter if we're reading from stdin, as we've reached EOF 1526 */ 1527 fclose(fp); 1528 } 1529 return (status); 1530 } 1531 1532 1533 static void 1534 reset_boot(void) 1535 { 1536 int i; 1537 struct dos_partition *partp; 1538 1539 init_boot(); 1540 for (i = 0; i < 4; ++i) 1541 { 1542 partp = ((struct dos_partition *) &mboot.parts) + i; 1543 bzero((char *)partp, sizeof (struct dos_partition)); 1544 } 1545 } 1546 1547 static int 1548 sanitize_partition(struct dos_partition *partp) 1549 { 1550 u_int32_t prev_head_boundary, prev_cyl_boundary; 1551 u_int32_t max_end, size, start; 1552 1553 start = partp->dp_start; 1554 size = partp->dp_size; 1555 max_end = start + size; 1556 /* Only allow a zero size if the partition is being marked unused. */ 1557 if (size == 0) { 1558 if (start == 0 && partp->dp_typ == 0) 1559 return (1); 1560 warnx("ERROR: size of partition is zero"); 1561 return (0); 1562 } 1563 /* Return if no adjustment is necessary. */ 1564 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1565 return (1); 1566 1567 if (start == 0) { 1568 warnx("WARNING: partition overlaps with partition table"); 1569 if (ok("Correct this automatically?")) 1570 start = dos_sectors; 1571 } 1572 if (start % dos_sectors != 0) 1573 warnx("WARNING: partition does not start on a head boundary"); 1574 if ((start +size) % dos_sectors != 0) 1575 warnx("WARNING: partition does not end on a cylinder boundary"); 1576 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1577 if (!ok("Correct this automatically?")) 1578 return (1); 1579 1580 /* 1581 * Adjust start upwards, if necessary, to fall on an head boundary. 1582 */ 1583 if (start % dos_sectors != 0) { 1584 prev_head_boundary = start / dos_sectors * dos_sectors; 1585 if (max_end < dos_sectors || 1586 prev_head_boundary >= max_end - dos_sectors) { 1587 /* 1588 * Can't go past end of partition 1589 */ 1590 warnx( 1591 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1592 return (0); 1593 } 1594 start = prev_head_boundary + dos_sectors; 1595 } 1596 1597 /* 1598 * Adjust size downwards, if necessary, to fall on a cylinder 1599 * boundary. 1600 */ 1601 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1602 if (prev_cyl_boundary > start) 1603 size = prev_cyl_boundary - start; 1604 else { 1605 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1606 and end on a cylinder boundary."); 1607 return (0); 1608 } 1609 1610 /* Finally, commit any changes to partp and return. */ 1611 if (start != partp->dp_start) { 1612 warnx("WARNING: adjusting start offset of partition to %u", 1613 (u_int)start); 1614 partp->dp_start = start; 1615 } 1616 if (size != partp->dp_size) { 1617 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1618 partp->dp_size = size; 1619 } 1620 1621 return (1); 1622 } 1623