fdisk.c revision 183487
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: head/sbin/fdisk/fdisk.c 183487 2008-09-30 07:18:49Z lulf $"); 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 50int iotest; 51 52#define LBUF 100 53static char lbuf[LBUF]; 54 55/* 56 * 57 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 58 * 59 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 60 * Copyright (c) 1989 Robert. V. Baron 61 * Created. 62 */ 63 64#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 65 66#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 67 68#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 69#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 70static int secsize = 0; /* the sensed sector size */ 71 72static char *disk; 73 74static int cyls, sectors, heads, cylsecs, disksecs; 75 76struct mboot { 77 unsigned char padding[2]; /* force the longs to be long aligned */ 78 unsigned char *bootinst; /* boot code */ 79 off_t bootinst_size; 80 struct dos_partition parts[NDOSPART]; 81}; 82 83static struct mboot mboot; 84static int fd; 85 86#define ACTIVE 0x80 87 88static uint dos_cyls; 89static uint dos_heads; 90static uint dos_sectors; 91static uint dos_cylsecs; 92 93#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 94#define DOSCYL(c) (c & 0xff) 95 96#define MAX_ARGS 10 97 98static int current_line_number; 99 100static int geom_processed = 0; 101static int part_processed = 0; 102static int active_processed = 0; 103 104typedef struct cmd { 105 char cmd; 106 int n_args; 107 struct arg { 108 char argtype; 109 int arg_val; 110 } args[MAX_ARGS]; 111} CMD; 112 113static int B_flag = 0; /* replace boot code */ 114static int I_flag = 0; /* use entire disk for FreeBSD */ 115static int a_flag = 0; /* set active partition */ 116static char *b_flag = NULL; /* path to boot code */ 117static int i_flag = 0; /* replace partition data */ 118static int q_flag = 0; /* Be quiet */ 119static int u_flag = 0; /* update partition data */ 120static int s_flag = 0; /* Print a summary and exit */ 121static int t_flag = 0; /* test only */ 122static char *f_flag = NULL; /* Read config info from file */ 123static int v_flag = 0; /* Be verbose */ 124static int print_config_flag = 0; 125 126static struct part_type 127{ 128 unsigned char type; 129 const char *name; 130} part_types[] = { 131 {0x00, "unused"} 132 ,{0x01, "Primary DOS with 12 bit FAT"} 133 ,{0x02, "XENIX / file system"} 134 ,{0x03, "XENIX /usr file system"} 135 ,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"} 136 ,{0x05, "Extended DOS"} 137 ,{0x06, "Primary 'big' DOS (>= 32MB)"} 138 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 139 ,{0x08, "AIX file system or SplitDrive"} 140 ,{0x09, "AIX boot partition or Coherent"} 141 ,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"} 142 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 143 ,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"} 144 ,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"} 145 ,{0x0F, "Extended DOS (LBA)"} 146 ,{0x10, "OPUS"} 147 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 148 ,{0x12, "Compaq diagnostics"} 149 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 150 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 151 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 152 ,{0x18, "AST Windows swapfile"} 153 ,{0x24, "NEC DOS"} 154 ,{0x3C, "PartitionMagic recovery"} 155 ,{0x39, "plan9"} 156 ,{0x40, "VENIX 286"} 157 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 158 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 159 ,{0x43, "Linux native (sharing disk with DRDOS)"} 160 ,{0x4D, "QNX 4.2 Primary"} 161 ,{0x4E, "QNX 4.2 Secondary"} 162 ,{0x4F, "QNX 4.2 Tertiary"} 163 ,{0x50, "DM (disk manager)"} 164 ,{0x51, "DM6 Aux1 (or Novell)"} 165 ,{0x52, "CP/M or Microport SysV/AT"} 166 ,{0x53, "DM6 Aux3"} 167 ,{0x54, "DM6"} 168 ,{0x55, "EZ-Drive (disk manager)"} 169 ,{0x56, "Golden Bow (disk manager)"} 170 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 171 ,{0x61, "SpeedStor"} 172 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"} 173 ,{0x64, "Novell Netware/286 2.xx"} 174 ,{0x65, "Novell Netware/386 3.xx"} 175 ,{0x70, "DiskSecure Multi-Boot"} 176 ,{0x75, "PCIX"} 177 ,{0x77, "QNX4.x"} 178 ,{0x78, "QNX4.x 2nd part"} 179 ,{0x79, "QNX4.x 3rd part"} 180 ,{0x80, "Minix until 1.4a"} 181 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"} 182 ,{0x82, "Linux swap or Solaris x86"} 183 ,{0x83, "Linux native"} 184 ,{0x84, "OS/2 hidden C: drive"} 185 ,{0x85, "Linux extended"} 186 ,{0x86, "NTFS volume set??"} 187 ,{0x87, "NTFS volume set??"} 188 ,{0x93, "Amoeba file system"} 189 ,{0x94, "Amoeba bad block table"} 190 ,{0x9F, "BSD/OS"} 191 ,{0xA0, "Suspend to Disk"} 192 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 193 ,{0xA6, "OpenBSD"} 194 ,{0xA7, "NeXTSTEP"} 195 ,{0xA9, "NetBSD"} 196 ,{0xAC, "IBM JFS"} 197 ,{0xAF, "HFS+"} 198 ,{0xB7, "BSDI BSD/386 file system"} 199 ,{0xB8, "BSDI BSD/386 swap"} 200 ,{0xBE, "Solaris x86 boot"} 201 ,{0xBF, "Solaris x86 (new)"} 202 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 203 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 204 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 205 ,{0xC7, "Syrinx"} 206 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 207 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 208 ,{0xE3, "DOS R/O or SpeedStor"} 209 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 210 ,{0xEB, "BeOS file system"} 211 ,{0xEE, "EFI GPT"} 212 ,{0xEF, "EFI System Partition"} 213 ,{0xF1, "SpeedStor"} 214 ,{0xF2, "DOS 3.3+ Secondary"} 215 ,{0xF4, "SpeedStor large partition"} 216 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 217 ,{0xFF, "Xenix bad blocks table"} 218}; 219 220static void print_s0(int which); 221static void print_part(int i); 222static void init_sector0(unsigned long start); 223static void init_boot(void); 224static void change_part(int i); 225static void print_params(void); 226static void change_active(int which); 227static void change_code(void); 228static void get_params_to_use(void); 229static char *get_rootdisk(void); 230static void dos(struct dos_partition *partp); 231static int open_disk(int flag); 232static ssize_t read_disk(off_t sector, void *buf); 233static int write_disk(off_t sector, void *buf); 234static int get_params(void); 235static int read_s0(void); 236static int write_s0(void); 237static int ok(const char *str); 238static int decimal(const char *str, int *num, int deflt); 239static const char *get_type(int type); 240static int read_config(char *config_file); 241static void reset_boot(void); 242static int sanitize_partition(struct dos_partition *); 243static void usage(void); 244 245int 246main(int argc, char *argv[]) 247{ 248 int c, i; 249 int partition = -1; 250 struct dos_partition *partp; 251 252 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 253 switch (c) { 254 case 'B': 255 B_flag = 1; 256 break; 257 case 'I': 258 I_flag = 1; 259 break; 260 case 'a': 261 a_flag = 1; 262 break; 263 case 'b': 264 b_flag = optarg; 265 break; 266 case 'f': 267 f_flag = optarg; 268 break; 269 case 'i': 270 i_flag = 1; 271 break; 272 case 'p': 273 print_config_flag = 1; 274 break; 275 case 'q': 276 q_flag = 1; 277 break; 278 case 's': 279 s_flag = 1; 280 break; 281 case 't': 282 t_flag = 1; 283 break; 284 case 'u': 285 u_flag = 1; 286 break; 287 case 'v': 288 v_flag = 1; 289 break; 290 case '1': 291 case '2': 292 case '3': 293 case '4': 294 partition = c - '0'; 295 break; 296 default: 297 usage(); 298 } 299 if (f_flag || i_flag) 300 u_flag = 1; 301 if (t_flag) 302 v_flag = 1; 303 argc -= optind; 304 argv += optind; 305 306 if (argc == 0) { 307 disk = get_rootdisk(); 308 } else { 309 disk = g_device_path(argv[0]); 310 if (disk == NULL) 311 err(1, "unable to get correct path for %s\n", argv[0]); 312 } 313 if (open_disk(u_flag) < 0) 314 err(1, "cannot open disk %s", disk); 315 316 /* (abu)use mboot.bootinst to probe for the sector size */ 317 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 318 err(1, "cannot allocate buffer to determine disk sector size"); 319 if (read_disk(0, mboot.bootinst) == -1) 320 errx(1, "could not detect sector size"); 321 free(mboot.bootinst); 322 mboot.bootinst = NULL; 323 324 if (print_config_flag) { 325 if (read_s0()) 326 err(1, "read_s0"); 327 328 printf("# %s\n", disk); 329 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 330 331 for (i = 0; i < NDOSPART; i++) { 332 partp = ((struct dos_partition *)&mboot.parts) + i; 333 334 if (partp->dp_start == 0 && partp->dp_size == 0) 335 continue; 336 337 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 338 (u_long)partp->dp_start, (u_long)partp->dp_size); 339 340 /* Fill flags for the partition. */ 341 if (partp->dp_flag & 0x80) 342 printf("a %d\n", i + 1); 343 } 344 exit(0); 345 } 346 if (s_flag) { 347 if (read_s0()) 348 err(1, "read_s0"); 349 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 350 dos_sectors); 351 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 352 for (i = 0; i < NDOSPART; i++) { 353 partp = ((struct dos_partition *) &mboot.parts) + i; 354 if (partp->dp_start == 0 && partp->dp_size == 0) 355 continue; 356 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 357 (u_long) partp->dp_start, 358 (u_long) partp->dp_size, partp->dp_typ, 359 partp->dp_flag); 360 } 361 exit(0); 362 } 363 364 printf("******* Working on device %s *******\n",disk); 365 366 if (I_flag) { 367 read_s0(); 368 reset_boot(); 369 partp = (struct dos_partition *) (&mboot.parts[0]); 370 partp->dp_typ = DOSPTYP_386BSD; 371 partp->dp_flag = ACTIVE; 372 partp->dp_start = dos_sectors; 373 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 374 dos_sectors; 375 dos(partp); 376 if (v_flag) 377 print_s0(-1); 378 if (!t_flag) 379 write_s0(); 380 exit(0); 381 } 382 if (f_flag) { 383 if (read_s0() || i_flag) 384 reset_boot(); 385 if (!read_config(f_flag)) 386 exit(1); 387 if (v_flag) 388 print_s0(-1); 389 if (!t_flag) 390 write_s0(); 391 } else { 392 if(u_flag) 393 get_params_to_use(); 394 else 395 print_params(); 396 397 if (read_s0()) 398 init_sector0(dos_sectors); 399 400 printf("Media sector size is %d\n", secsize); 401 printf("Warning: BIOS sector numbering starts with sector 1\n"); 402 printf("Information from DOS bootblock is:\n"); 403 if (partition == -1) 404 for (i = 1; i <= NDOSPART; i++) 405 change_part(i); 406 else 407 change_part(partition); 408 409 if (u_flag || a_flag) 410 change_active(partition); 411 412 if (B_flag) 413 change_code(); 414 415 if (u_flag || a_flag || B_flag) { 416 if (!t_flag) { 417 printf("\nWe haven't changed the partition table yet. "); 418 printf("This is your last chance.\n"); 419 } 420 print_s0(-1); 421 if (!t_flag) { 422 if (ok("Should we write new partition table?")) 423 write_s0(); 424 } else { 425 printf("\n-t flag specified -- partition table not written.\n"); 426 } 427 } 428 } 429 430 exit(0); 431} 432 433static void 434usage() 435{ 436 fprintf(stderr, "%s%s", 437 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 438 " fdisk -f configfile [-itv] [disk]\n"); 439 exit(1); 440} 441 442static void 443print_s0(int which) 444{ 445 int i; 446 447 print_params(); 448 printf("Information from DOS bootblock is:\n"); 449 if (which == -1) 450 for (i = 1; i <= NDOSPART; i++) 451 printf("%d: ", i), print_part(i); 452 else 453 print_part(which); 454} 455 456static struct dos_partition mtpart; 457 458static void 459print_part(int i) 460{ 461 struct dos_partition *partp; 462 u_int64_t part_mb; 463 464 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 465 466 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 467 printf("<UNUSED>\n"); 468 return; 469 } 470 /* 471 * Be careful not to overflow. 472 */ 473 part_mb = partp->dp_size; 474 part_mb *= secsize; 475 part_mb /= (1024 * 1024); 476 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 477 get_type(partp->dp_typ)); 478 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 479 (u_long)partp->dp_start, 480 (u_long)partp->dp_size, 481 (uintmax_t)part_mb, 482 partp->dp_flag, 483 partp->dp_flag == ACTIVE ? " (active)" : ""); 484 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 485 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 486 ,partp->dp_shd 487 ,DPSECT(partp->dp_ssect) 488 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 489 ,partp->dp_ehd 490 ,DPSECT(partp->dp_esect)); 491} 492 493 494static void 495init_boot(void) 496{ 497#ifndef __ia64__ 498 const char *fname; 499 int fdesc, n; 500 struct stat sb; 501 502 fname = b_flag ? b_flag : "/boot/mbr"; 503 if ((fdesc = open(fname, O_RDONLY)) == -1 || 504 fstat(fdesc, &sb) == -1) 505 err(1, "%s", fname); 506 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 507 errx(1, "%s: length must be a multiple of sector size", fname); 508 if (mboot.bootinst != NULL) 509 free(mboot.bootinst); 510 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 511 errx(1, "%s: unable to allocate read buffer", fname); 512 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 513 close(fdesc)) 514 err(1, "%s", fname); 515 if (n != mboot.bootinst_size) 516 errx(1, "%s: short read", fname); 517#else 518 if (mboot.bootinst != NULL) 519 free(mboot.bootinst); 520 mboot.bootinst_size = secsize; 521 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 522 errx(1, "unable to allocate boot block buffer"); 523 memset(mboot.bootinst, 0, mboot.bootinst_size); 524 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 525#endif 526} 527 528 529static void 530init_sector0(unsigned long start) 531{ 532 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]); 533 534 init_boot(); 535 536 partp->dp_typ = DOSPTYP_386BSD; 537 partp->dp_flag = ACTIVE; 538 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 539 if(start == 0) 540 start = dos_sectors; 541 partp->dp_start = start; 542 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 543 544 dos(partp); 545} 546 547static void 548change_part(int i) 549{ 550 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 551 552 printf("The data for partition %d is:\n", i); 553 print_part(i); 554 555 if (u_flag && ok("Do you want to change it?")) { 556 int tmp; 557 558 if (i_flag) { 559 bzero((char *)partp, sizeof (struct dos_partition)); 560 if (i == 1) { 561 init_sector0(1); 562 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 563 print_part(i); 564 } 565 } 566 567 do { 568 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 569 Decimal("start", partp->dp_start, tmp); 570 Decimal("size", partp->dp_size, tmp); 571 if (!sanitize_partition(partp)) { 572 warnx("ERROR: failed to adjust; setting sysid to 0"); 573 partp->dp_typ = 0; 574 } 575 576 if (ok("Explicitly specify beg/end address ?")) 577 { 578 int tsec,tcyl,thd; 579 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 580 thd = partp->dp_shd; 581 tsec = DPSECT(partp->dp_ssect); 582 Decimal("beginning cylinder", tcyl, tmp); 583 Decimal("beginning head", thd, tmp); 584 Decimal("beginning sector", tsec, tmp); 585 partp->dp_scyl = DOSCYL(tcyl); 586 partp->dp_ssect = DOSSECT(tsec,tcyl); 587 partp->dp_shd = thd; 588 589 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 590 thd = partp->dp_ehd; 591 tsec = DPSECT(partp->dp_esect); 592 Decimal("ending cylinder", tcyl, tmp); 593 Decimal("ending head", thd, tmp); 594 Decimal("ending sector", tsec, tmp); 595 partp->dp_ecyl = DOSCYL(tcyl); 596 partp->dp_esect = DOSSECT(tsec,tcyl); 597 partp->dp_ehd = thd; 598 } else 599 dos(partp); 600 601 print_part(i); 602 } while (!ok("Are we happy with this entry?")); 603 } 604} 605 606static void 607print_params() 608{ 609 printf("parameters extracted from in-core disklabel are:\n"); 610 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 611 ,cyls,heads,sectors,cylsecs); 612 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 613 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 614 printf("parameters to be used for BIOS calculations are:\n"); 615 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 616 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 617} 618 619static void 620change_active(int which) 621{ 622 struct dos_partition *partp = &mboot.parts[0]; 623 int active, i, new, tmp; 624 625 active = -1; 626 for (i = 0; i < NDOSPART; i++) { 627 if ((partp[i].dp_flag & ACTIVE) == 0) 628 continue; 629 printf("Partition %d is marked active\n", i + 1); 630 if (active == -1) 631 active = i + 1; 632 } 633 if (a_flag && which != -1) 634 active = which; 635 else if (active == -1) 636 active = 1; 637 638 if (!ok("Do you want to change the active partition?")) 639 return; 640setactive: 641 do { 642 new = active; 643 Decimal("active partition", new, tmp); 644 if (new < 1 || new > 4) { 645 printf("Active partition number must be in range 1-4." 646 " Try again.\n"); 647 goto setactive; 648 } 649 active = new; 650 } while (!ok("Are you happy with this choice")); 651 for (i = 0; i < NDOSPART; i++) 652 partp[i].dp_flag = 0; 653 if (active > 0 && active <= NDOSPART) 654 partp[active-1].dp_flag = ACTIVE; 655} 656 657static void 658change_code() 659{ 660 if (ok("Do you want to change the boot code?")) 661 init_boot(); 662} 663 664void 665get_params_to_use() 666{ 667 int tmp; 668 print_params(); 669 if (ok("Do you want to change our idea of what BIOS thinks ?")) 670 { 671 do 672 { 673 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 674 Decimal("BIOS's idea of #heads", dos_heads, tmp); 675 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 676 dos_cylsecs = dos_heads * dos_sectors; 677 print_params(); 678 } 679 while(!ok("Are you happy with this choice")); 680 } 681} 682 683 684/***********************************************\ 685* Change real numbers into strange dos numbers * 686\***********************************************/ 687static void 688dos(struct dos_partition *partp) 689{ 690 int cy, sec; 691 u_int32_t end; 692 693 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 694 memcpy(partp, &mtpart, sizeof(*partp)); 695 return; 696 } 697 698 /* Start c/h/s. */ 699 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 700 cy = partp->dp_start / dos_cylsecs; 701 sec = partp->dp_start % dos_sectors + 1; 702 partp->dp_scyl = DOSCYL(cy); 703 partp->dp_ssect = DOSSECT(sec, cy); 704 705 /* End c/h/s. */ 706 end = partp->dp_start + partp->dp_size - 1; 707 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 708 cy = end / dos_cylsecs; 709 sec = end % dos_sectors + 1; 710 partp->dp_ecyl = DOSCYL(cy); 711 partp->dp_esect = DOSSECT(sec, cy); 712} 713 714static int 715open_disk(int flag) 716{ 717 int rwmode; 718 719 /* Write mode if one of these flags are set. */ 720 rwmode = (a_flag || I_flag || B_flag || flag); 721 fd = g_open(disk, rwmode); 722 /* If the mode fails, try read-only if we didn't. */ 723 if (fd == -1 && errno == EPERM && rwmode) 724 fd = g_open(disk, 0); 725 if (fd == -1 && errno == ENXIO) 726 return -2; 727 if (fd == -1) { 728 warnx("can't open device %s", disk); 729 return -1; 730 } 731 if (get_params() == -1) { 732 warnx("can't get disk parameters on %s", disk); 733 return -1; 734 } 735 return fd; 736} 737 738static ssize_t 739read_disk(off_t sector, void *buf) 740{ 741 742 lseek(fd, (sector * 512), 0); 743 if (secsize == 0) 744 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 745 secsize *= 2) { 746 /* try the read */ 747 int size = read(fd, buf, secsize); 748 if (size == secsize) 749 /* it worked so return */ 750 return secsize; 751 } 752 else 753 return read(fd, buf, secsize); 754 755 /* we failed to read at any of the sizes */ 756 return -1; 757} 758 759static int 760write_disk(off_t sector, void *buf) 761{ 762 int error; 763 struct gctl_req *grq; 764 const char *errmsg; 765 char fbuf[BUFSIZ], *pname; 766 int i, fdw; 767 768 grq = gctl_get_handle(); 769 gctl_ro_param(grq, "verb", -1, "write MBR"); 770 gctl_ro_param(grq, "class", -1, "MBR"); 771 pname = g_providername(fd); 772 if (pname == NULL) { 773 warn("Error getting providername for %s", disk); 774 return (-1); 775 } 776 gctl_ro_param(grq, "geom", -1, pname); 777 gctl_ro_param(grq, "data", secsize, buf); 778 errmsg = gctl_issue(grq); 779 free(pname); 780 if (errmsg == NULL) { 781 gctl_free(grq); 782 return(0); 783 } 784 if (!q_flag) /* GEOM errors are benign, not all devices supported */ 785 warnx("%s", errmsg); 786 gctl_free(grq); 787 788 error = pwrite(fd, buf, secsize, (sector * 512)); 789 if (error == secsize) 790 return (0); 791 792 for (i = 1; i < 5; i++) { 793 sprintf(fbuf, "%ss%d", disk, i); 794 fdw = open(fbuf, O_RDWR, 0); 795 if (fdw < 0) 796 continue; 797 error = ioctl(fdw, DIOCSMBR, buf); 798 close(fdw); 799 if (error == 0) 800 return (0); 801 } 802 warnx("Failed to write sector zero"); 803 return(EINVAL); 804} 805 806static int 807get_params() 808{ 809 int error; 810 u_int u; 811 off_t o; 812 813 error = ioctl(fd, DIOCGFWSECTORS, &u); 814 if (error == 0) 815 sectors = dos_sectors = u; 816 else 817 sectors = dos_sectors = 63; 818 819 error = ioctl(fd, DIOCGFWHEADS, &u); 820 if (error == 0) 821 heads = dos_heads = u; 822 else 823 heads = dos_heads = 255; 824 825 dos_cylsecs = cylsecs = heads * sectors; 826 disksecs = cyls * heads * sectors; 827 828 u = g_sectorsize(fd); 829 if (u <= 0) 830 return (-1); 831 832 o = g_mediasize(fd); 833 if (o < 0) 834 return (-1); 835 disksecs = o / u; 836 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 837 838 return (disksecs); 839} 840 841static int 842read_s0() 843{ 844 int i; 845 846 mboot.bootinst_size = secsize; 847 if (mboot.bootinst != NULL) 848 free(mboot.bootinst); 849 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 850 warnx("unable to allocate buffer to read fdisk " 851 "partition table"); 852 return -1; 853 } 854 if (read_disk(0, mboot.bootinst) == -1) { 855 warnx("can't read fdisk partition table"); 856 return -1; 857 } 858 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 859 warnx("invalid fdisk partition table found"); 860 /* So should we initialize things */ 861 return -1; 862 } 863 for (i = 0; i < NDOSPART; i++) 864 dos_partition_dec( 865 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 866 &mboot.parts[i]); 867 return 0; 868} 869 870static int 871write_s0() 872{ 873 int sector, i; 874 875 if (iotest) { 876 print_s0(-1); 877 return 0; 878 } 879 for(i = 0; i < NDOSPART; i++) 880 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 881 &mboot.parts[i]); 882 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 883 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 884 if (write_disk(sector, 885 &mboot.bootinst[sector * secsize]) == -1) { 886 warn("can't write fdisk partition table"); 887 return -1; 888 } 889 return(0); 890} 891 892 893static int 894ok(const char *str) 895{ 896 printf("%s [n] ", str); 897 fflush(stdout); 898 if (fgets(lbuf, LBUF, stdin) == NULL) 899 exit(1); 900 lbuf[strlen(lbuf)-1] = 0; 901 902 if (*lbuf && 903 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 904 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 905 return 1; 906 else 907 return 0; 908} 909 910static int 911decimal(const char *str, int *num, int deflt) 912{ 913 int acc = 0, c; 914 char *cp; 915 916 while (1) { 917 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 918 fflush(stdout); 919 if (fgets(lbuf, LBUF, stdin) == NULL) 920 exit(1); 921 lbuf[strlen(lbuf)-1] = 0; 922 923 if (!*lbuf) 924 return 0; 925 926 cp = lbuf; 927 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 928 if (!c) 929 return 0; 930 while ((c = *cp++)) { 931 if (c <= '9' && c >= '0') 932 acc = acc * 10 + c - '0'; 933 else 934 break; 935 } 936 if (c == ' ' || c == '\t') 937 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 938 if (!c) { 939 *num = acc; 940 return 1; 941 } else 942 printf("%s is an invalid decimal number. Try again.\n", 943 lbuf); 944 } 945 946} 947 948static const char * 949get_type(int type) 950{ 951 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 952 int counter = 0; 953 struct part_type *ptr = part_types; 954 955 956 while(counter < numentries) { 957 if(ptr->type == type) 958 return(ptr->name); 959 ptr++; 960 counter++; 961 } 962 return("unknown"); 963} 964 965 966static void 967parse_config_line(char *line, CMD *command) 968{ 969 char *cp, *end; 970 971 cp = line; 972 while (1) { 973 memset(command, 0, sizeof(*command)); 974 975 while (isspace(*cp)) ++cp; 976 if (*cp == '\0' || *cp == '#') 977 break; 978 command->cmd = *cp++; 979 980 /* 981 * Parse args 982 */ 983 while (1) { 984 while (isspace(*cp)) ++cp; 985 if (*cp == '#') 986 break; /* found comment */ 987 if (isalpha(*cp)) 988 command->args[command->n_args].argtype = *cp++; 989 if (!isdigit(*cp)) 990 break; /* assume end of line */ 991 end = NULL; 992 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 993 if (cp == end) 994 break; /* couldn't parse number */ 995 cp = end; 996 command->n_args++; 997 } 998 break; 999 } 1000} 1001 1002 1003static int 1004process_geometry(CMD *command) 1005{ 1006 int status = 1, i; 1007 1008 while (1) { 1009 geom_processed = 1; 1010 if (part_processed) { 1011 warnx( 1012 "ERROR line %d: the geometry specification line must occur before\n\ 1013 all partition specifications", 1014 current_line_number); 1015 status = 0; 1016 break; 1017 } 1018 if (command->n_args != 3) { 1019 warnx("ERROR line %d: incorrect number of geometry args", 1020 current_line_number); 1021 status = 0; 1022 break; 1023 } 1024 dos_cyls = 0; 1025 dos_heads = 0; 1026 dos_sectors = 0; 1027 for (i = 0; i < 3; ++i) { 1028 switch (command->args[i].argtype) { 1029 case 'c': 1030 dos_cyls = command->args[i].arg_val; 1031 break; 1032 case 'h': 1033 dos_heads = command->args[i].arg_val; 1034 break; 1035 case 's': 1036 dos_sectors = command->args[i].arg_val; 1037 break; 1038 default: 1039 warnx( 1040 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1041 current_line_number, command->args[i].argtype, 1042 command->args[i].argtype); 1043 status = 0; 1044 break; 1045 } 1046 } 1047 if (status == 0) 1048 break; 1049 1050 dos_cylsecs = dos_heads * dos_sectors; 1051 1052 /* 1053 * Do sanity checks on parameter values 1054 */ 1055 if (dos_cyls == 0) { 1056 warnx("ERROR line %d: number of cylinders not specified", 1057 current_line_number); 1058 status = 0; 1059 } 1060 if (dos_cyls > 1024) { 1061 warnx( 1062 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1063 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1064 is dedicated to FreeBSD)", 1065 current_line_number, dos_cyls); 1066 } 1067 1068 if (dos_heads == 0) { 1069 warnx("ERROR line %d: number of heads not specified", 1070 current_line_number); 1071 status = 0; 1072 } else if (dos_heads > 256) { 1073 warnx("ERROR line %d: number of heads must be within (1-256)", 1074 current_line_number); 1075 status = 0; 1076 } 1077 1078 if (dos_sectors == 0) { 1079 warnx("ERROR line %d: number of sectors not specified", 1080 current_line_number); 1081 status = 0; 1082 } else if (dos_sectors > 63) { 1083 warnx("ERROR line %d: number of sectors must be within (1-63)", 1084 current_line_number); 1085 status = 0; 1086 } 1087 1088 break; 1089 } 1090 return (status); 1091} 1092 1093 1094static int 1095process_partition(CMD *command) 1096{ 1097 int status = 0, partition; 1098 u_int32_t prev_head_boundary, prev_cyl_boundary; 1099 u_int32_t adj_size, max_end; 1100 struct dos_partition *partp; 1101 1102 while (1) { 1103 part_processed = 1; 1104 if (command->n_args != 4) { 1105 warnx("ERROR line %d: incorrect number of partition args", 1106 current_line_number); 1107 break; 1108 } 1109 partition = command->args[0].arg_val; 1110 if (partition < 1 || partition > 4) { 1111 warnx("ERROR line %d: invalid partition number %d", 1112 current_line_number, partition); 1113 break; 1114 } 1115 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1116 bzero((char *)partp, sizeof (struct dos_partition)); 1117 partp->dp_typ = command->args[1].arg_val; 1118 partp->dp_start = command->args[2].arg_val; 1119 partp->dp_size = command->args[3].arg_val; 1120 max_end = partp->dp_start + partp->dp_size; 1121 1122 if (partp->dp_typ == 0) { 1123 /* 1124 * Get out, the partition is marked as unused. 1125 */ 1126 /* 1127 * Insure that it's unused. 1128 */ 1129 bzero((char *)partp, sizeof (struct dos_partition)); 1130 status = 1; 1131 break; 1132 } 1133 1134 /* 1135 * Adjust start upwards, if necessary, to fall on a head boundary. 1136 */ 1137 if (partp->dp_start % dos_sectors != 0) { 1138 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1139 if (max_end < dos_sectors || 1140 prev_head_boundary > max_end - dos_sectors) { 1141 /* 1142 * Can't go past end of partition 1143 */ 1144 warnx( 1145 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1146 a head boundary", 1147 current_line_number, partition); 1148 break; 1149 } 1150 warnx( 1151 "WARNING: adjusting start offset of partition %d\n\ 1152 from %u to %u, to fall on a head boundary", 1153 partition, (u_int)partp->dp_start, 1154 (u_int)(prev_head_boundary + dos_sectors)); 1155 partp->dp_start = prev_head_boundary + dos_sectors; 1156 } 1157 1158 /* 1159 * Adjust size downwards, if necessary, to fall on a cylinder 1160 * boundary. 1161 */ 1162 prev_cyl_boundary = 1163 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1164 if (prev_cyl_boundary > partp->dp_start) 1165 adj_size = prev_cyl_boundary - partp->dp_start; 1166 else { 1167 warnx( 1168 "ERROR: could not adjust partition to start on a head boundary\n\ 1169 and end on a cylinder boundary."); 1170 return (0); 1171 } 1172 if (adj_size != partp->dp_size) { 1173 warnx( 1174 "WARNING: adjusting size of partition %d from %u to %u\n\ 1175 to end on a cylinder boundary", 1176 partition, (u_int)partp->dp_size, (u_int)adj_size); 1177 partp->dp_size = adj_size; 1178 } 1179 if (partp->dp_size == 0) { 1180 warnx("ERROR line %d: size of partition %d is zero", 1181 current_line_number, partition); 1182 break; 1183 } 1184 1185 dos(partp); 1186 status = 1; 1187 break; 1188 } 1189 return (status); 1190} 1191 1192 1193static int 1194process_active(CMD *command) 1195{ 1196 int status = 0, partition, i; 1197 struct dos_partition *partp; 1198 1199 while (1) { 1200 active_processed = 1; 1201 if (command->n_args != 1) { 1202 warnx("ERROR line %d: incorrect number of active args", 1203 current_line_number); 1204 status = 0; 1205 break; 1206 } 1207 partition = command->args[0].arg_val; 1208 if (partition < 1 || partition > 4) { 1209 warnx("ERROR line %d: invalid partition number %d", 1210 current_line_number, partition); 1211 break; 1212 } 1213 /* 1214 * Reset active partition 1215 */ 1216 partp = ((struct dos_partition *) &mboot.parts); 1217 for (i = 0; i < NDOSPART; i++) 1218 partp[i].dp_flag = 0; 1219 partp[partition-1].dp_flag = ACTIVE; 1220 1221 status = 1; 1222 break; 1223 } 1224 return (status); 1225} 1226 1227 1228static int 1229process_line(char *line) 1230{ 1231 CMD command; 1232 int status = 1; 1233 1234 while (1) { 1235 parse_config_line(line, &command); 1236 switch (command.cmd) { 1237 case 0: 1238 /* 1239 * Comment or blank line 1240 */ 1241 break; 1242 case 'g': 1243 /* 1244 * Set geometry 1245 */ 1246 status = process_geometry(&command); 1247 break; 1248 case 'p': 1249 status = process_partition(&command); 1250 break; 1251 case 'a': 1252 status = process_active(&command); 1253 break; 1254 default: 1255 status = 0; 1256 break; 1257 } 1258 break; 1259 } 1260 return (status); 1261} 1262 1263 1264static int 1265read_config(char *config_file) 1266{ 1267 FILE *fp = NULL; 1268 int status = 1; 1269 char buf[1010]; 1270 1271 while (1) { 1272 if (strcmp(config_file, "-") != 0) { 1273 /* 1274 * We're not reading from stdin 1275 */ 1276 if ((fp = fopen(config_file, "r")) == NULL) { 1277 status = 0; 1278 break; 1279 } 1280 } else { 1281 fp = stdin; 1282 } 1283 current_line_number = 0; 1284 while (!feof(fp)) { 1285 if (fgets(buf, sizeof(buf), fp) == NULL) 1286 break; 1287 ++current_line_number; 1288 status = process_line(buf); 1289 if (status == 0) 1290 break; 1291 } 1292 break; 1293 } 1294 if (fp) { 1295 /* 1296 * It doesn't matter if we're reading from stdin, as we've reached EOF 1297 */ 1298 fclose(fp); 1299 } 1300 return (status); 1301} 1302 1303 1304static void 1305reset_boot(void) 1306{ 1307 int i; 1308 struct dos_partition *partp; 1309 1310 init_boot(); 1311 for (i = 0; i < 4; ++i) { 1312 partp = ((struct dos_partition *) &mboot.parts) + i; 1313 bzero((char *)partp, sizeof (struct dos_partition)); 1314 } 1315} 1316 1317static int 1318sanitize_partition(struct dos_partition *partp) 1319{ 1320 u_int32_t prev_head_boundary, prev_cyl_boundary; 1321 u_int32_t max_end, size, start; 1322 1323 start = partp->dp_start; 1324 size = partp->dp_size; 1325 max_end = start + size; 1326 /* Only allow a zero size if the partition is being marked unused. */ 1327 if (size == 0) { 1328 if (start == 0 && partp->dp_typ == 0) 1329 return (1); 1330 warnx("ERROR: size of partition is zero"); 1331 return (0); 1332 } 1333 /* Return if no adjustment is necessary. */ 1334 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1335 return (1); 1336 1337 if (start == 0) { 1338 warnx("WARNING: partition overlaps with partition table"); 1339 if (ok("Correct this automatically?")) 1340 start = dos_sectors; 1341 } 1342 if (start % dos_sectors != 0) 1343 warnx("WARNING: partition does not start on a head boundary"); 1344 if ((start +size) % dos_sectors != 0) 1345 warnx("WARNING: partition does not end on a cylinder boundary"); 1346 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1347 if (!ok("Correct this automatically?")) 1348 return (1); 1349 1350 /* 1351 * Adjust start upwards, if necessary, to fall on a head boundary. 1352 */ 1353 if (start % dos_sectors != 0) { 1354 prev_head_boundary = start / dos_sectors * dos_sectors; 1355 if (max_end < dos_sectors || 1356 prev_head_boundary >= max_end - dos_sectors) { 1357 /* 1358 * Can't go past end of partition 1359 */ 1360 warnx( 1361 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1362 return (0); 1363 } 1364 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 = ((start + size) / dos_cylsecs) * dos_cylsecs; 1372 if (prev_cyl_boundary > start) 1373 size = prev_cyl_boundary - start; 1374 else { 1375 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1376 and end on a cylinder boundary."); 1377 return (0); 1378 } 1379 1380 /* Finally, commit any changes to partp and return. */ 1381 if (start != partp->dp_start) { 1382 warnx("WARNING: adjusting start offset of partition to %u", 1383 (u_int)start); 1384 partp->dp_start = start; 1385 } 1386 if (size != partp->dp_size) { 1387 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1388 partp->dp_size = size; 1389 } 1390 1391 return (1); 1392} 1393 1394/* 1395 * Try figuring out the root device's canonical disk name. 1396 * The following choices are considered: 1397 * /dev/ad0s1a => /dev/ad0 1398 * /dev/da0a => /dev/da0 1399 * /dev/vinum/root => /dev/vinum/root 1400 */ 1401static char * 1402get_rootdisk(void) 1403{ 1404 struct statfs rootfs; 1405 regex_t re; 1406#define NMATCHES 2 1407 regmatch_t rm[NMATCHES]; 1408 char *s; 1409 int rv; 1410 1411 if (statfs("/", &rootfs) == -1) 1412 err(1, "statfs(\"/\")"); 1413 1414 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$", 1415 REG_EXTENDED)) != 0) 1416 errx(1, "regcomp() failed (%d)", rv); 1417 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1418 errx(1, 1419"mounted root fs resource doesn't match expectations (regexec returned %d)", 1420 rv); 1421 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1422 errx(1, "out of memory"); 1423 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1424 rm[1].rm_eo - rm[1].rm_so); 1425 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1426 1427 return s; 1428} 1429