1/* 2 * Mach Operating System 3 * Copyright (c) 1992 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/disk.h> 31#include <sys/disklabel.h> 32#include <sys/diskmbr.h> 33#include <sys/endian.h> 34#include <sys/param.h> 35#include <sys/stat.h> 36#include <sys/mount.h> 37#include <ctype.h> 38#include <fcntl.h> 39#include <err.h> 40#include <errno.h> 41#include <libgeom.h> 42#include <paths.h> 43#include <regex.h> 44#include <stdint.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <string.h> 48#include <unistd.h> 49 50int iotest; 51 52#define NO_DISK_SECTORS ((u_int32_t)-1) 53#define NO_TRACK_CYLINDERS 1023 54#define NO_TRACK_HEADS 255 55#define NO_TRACK_SECTORS 63 56#define LBUF 100 57static char lbuf[LBUF]; 58 59/* 60 * 61 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 62 * 63 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 64 * Copyright (c) 1989 Robert. V. Baron 65 * Created. 66 */ 67 68#define Decimal(str, ans, tmp, maxval) if (decimal(str, &tmp, ans, maxval)) ans = tmp 69 70#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 71 72#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 73#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 74static int secsize = 0; /* the sensed sector size */ 75 76static char *disk; 77 78static int cyls, sectors, heads, cylsecs, disksecs; 79 80struct mboot { 81 unsigned char *bootinst; /* boot code */ 82 off_t bootinst_size; 83 struct dos_partition parts[NDOSPART]; 84}; 85 86static struct mboot mboot; 87static int fd; 88 89#define ACTIVE 0x80 90 91static uint dos_cyls; 92static uint dos_heads; 93static uint dos_sectors; 94static uint dos_cylsecs; 95 96#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 97#define DOSCYL(c) (c & 0xff) 98 99#define MAX_ARGS 10 100 101static int current_line_number; 102 103static int geom_processed = 0; 104static int part_processed = 0; 105static int active_processed = 0; 106 107typedef struct cmd { 108 char cmd; 109 int n_args; 110 struct arg { 111 char argtype; 112 unsigned long arg_val; 113 char * arg_str; 114 } args[MAX_ARGS]; 115} CMD; 116 117static int B_flag = 0; /* replace boot code */ 118static int I_flag = 0; /* use entire disk for FreeBSD */ 119static int a_flag = 0; /* set active partition */ 120static char *b_flag = NULL; /* path to boot code */ 121static int i_flag = 0; /* replace partition data */ 122static int q_flag = 0; /* Be quiet */ 123static int u_flag = 0; /* update partition data */ 124static int s_flag = 0; /* Print a summary and exit */ 125static int t_flag = 0; /* test only */ 126static char *f_flag = NULL; /* Read config info from file */ 127static int v_flag = 0; /* Be verbose */ 128static int print_config_flag = 0; 129 130/* 131 * A list of partition types, probably outdated. 132 */ 133static const char *const part_types[256] = { 134 [0x00] = "unused", 135 [0x01] = "Primary DOS with 12 bit FAT", 136 [0x02] = "XENIX / file system", 137 [0x03] = "XENIX /usr file system", 138 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)", 139 [0x05] = "Extended DOS", 140 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)", 141 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX", 142 [0x08] = "AIX file system or SplitDrive", 143 [0x09] = "AIX boot partition or Coherent", 144 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap", 145 [0x0B] = "DOS or Windows 95 with 32 bit FAT", 146 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)", 147 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)", 148 [0x0F] = "Extended DOS (LBA)", 149 [0x10] = "OPUS", 150 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT", 151 [0x12] = "Compaq diagnostics", 152 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)", 153 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)", 154 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)", 155 [0x18] = "AST Windows swapfile", 156 [0x1b] = "ASUS Recovery partition (NTFS)", 157 [0x24] = "NEC DOS", 158 [0x3C] = "PartitionMagic recovery", 159 [0x39] = "plan9", 160 [0x40] = "VENIX 286", 161 [0x41] = "Linux/MINIX (sharing disk with DRDOS)", 162 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)", 163 [0x43] = "Linux native (sharing disk with DRDOS)", 164 [0x4D] = "QNX 4.2 Primary", 165 [0x4E] = "QNX 4.2 Secondary", 166 [0x4F] = "QNX 4.2 Tertiary", 167 [0x50] = "DM (disk manager)", 168 [0x51] = "DM6 Aux1 (or Novell)", 169 [0x52] = "CP/M or Microport SysV/AT", 170 [0x53] = "DM6 Aux3", 171 [0x54] = "DM6", 172 [0x55] = "EZ-Drive (disk manager)", 173 [0x56] = "Golden Bow (disk manager)", 174 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */ 175 [0x61] = "SpeedStor", 176 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach", 177 [0x64] = "Novell Netware/286 2.xx", 178 [0x65] = "Novell Netware/386 3.xx", 179 [0x70] = "DiskSecure Multi-Boot", 180 [0x75] = "PCIX", 181 [0x77] = "QNX4.x", 182 [0x78] = "QNX4.x 2nd part", 183 [0x79] = "QNX4.x 3rd part", 184 [0x80] = "Minix until 1.4a", 185 [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager", 186 [0x82] = "Linux swap or Solaris x86", 187 [0x83] = "Linux native", 188 [0x84] = "OS/2 hidden C: drive", 189 [0x85] = "Linux extended", 190 [0x86] = "NTFS volume set??", 191 [0x87] = "NTFS volume set??", 192 [0x93] = "Amoeba file system", 193 [0x94] = "Amoeba bad block table", 194 [0x9F] = "BSD/OS", 195 [0xA0] = "Suspend to Disk", 196 [0xA5] = "FreeBSD/NetBSD/386BSD", 197 [0xA6] = "OpenBSD", 198 [0xA7] = "NeXTSTEP", 199 [0xA9] = "NetBSD", 200 [0xAC] = "IBM JFS", 201 [0xAF] = "HFS+", 202 [0xB7] = "BSDI BSD/386 file system", 203 [0xB8] = "BSDI BSD/386 swap", 204 [0xBE] = "Solaris x86 boot", 205 [0xBF] = "Solaris x86 (new)", 206 [0xC1] = "DRDOS/sec with 12-bit FAT", 207 [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)", 208 [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)", 209 [0xC7] = "Syrinx", 210 [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS", 211 [0xDE] = "DELL Utilities - FAT filesystem", 212 [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition", 213 [0xE3] = "DOS R/O or SpeedStor", 214 [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.", 215 [0xEB] = "BeOS file system", 216 [0xEE] = "EFI GPT", 217 [0xEF] = "EFI System Partition", 218 [0xF1] = "SpeedStor", 219 [0xF2] = "DOS 3.3+ Secondary", 220 [0xF4] = "SpeedStor large partition", 221 [0xFB] = "VMware VMFS", 222 [0xFE] = "SpeedStor >1024 cyl. or LANstep", 223 [0xFF] = "Xenix bad blocks table", 224}; 225 226static const char * 227get_type(int t) 228{ 229 const char *ret; 230 231 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL; 232 return ret ? ret : "unknown"; 233} 234 235 236static int geom_class_available(const char *); 237static void print_s0(void); 238static void print_part(const struct dos_partition *); 239static void init_sector0(unsigned long start); 240static void init_boot(void); 241static void change_part(int i); 242static void print_params(void); 243static void change_active(int which); 244static void change_code(void); 245static void get_params_to_use(void); 246static char *get_rootdisk(void); 247static void dos(struct dos_partition *partp); 248static int open_disk(int flag); 249static ssize_t read_disk(off_t sector, void *buf); 250static int write_disk(off_t sector, void *buf); 251static int get_params(void); 252static int read_s0(void); 253static int write_s0(void); 254static int ok(const char *str); 255static int decimal(const char *str, int *num, int deflt, uint32_t maxval); 256static int read_config(char *config_file); 257static void reset_boot(void); 258static int sanitize_partition(struct dos_partition *); 259static void usage(void); 260 261int 262main(int argc, char *argv[]) 263{ 264 int c, i; 265 int partition = -1; 266 struct dos_partition *partp; 267 268 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 269 switch (c) { 270 case 'B': 271 B_flag = 1; 272 break; 273 case 'I': 274 I_flag = 1; 275 break; 276 case 'a': 277 a_flag = 1; 278 break; 279 case 'b': 280 b_flag = optarg; 281 break; 282 case 'f': 283 f_flag = optarg; 284 break; 285 case 'i': 286 i_flag = 1; 287 break; 288 case 'p': 289 print_config_flag = 1; 290 break; 291 case 'q': 292 q_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 = get_rootdisk(); 324 } else { 325 disk = g_device_path(argv[0]); 326 if (disk == NULL) 327 err(1, "unable to get correct path for %s", argv[0]); 328 } 329 if (open_disk(u_flag) < 0) 330 err(1, "cannot open disk %s", disk); 331 332 /* (abu)use mboot.bootinst to probe for the sector size */ 333 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 334 err(1, "cannot allocate buffer to determine disk sector size"); 335 if (read_disk(0, mboot.bootinst) == -1) 336 errx(1, "could not detect sector size"); 337 free(mboot.bootinst); 338 mboot.bootinst = NULL; 339 340 if (print_config_flag) { 341 if (read_s0()) 342 err(1, "read_s0"); 343 344 printf("# %s\n", disk); 345 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 346 347 for (i = 0; i < NDOSPART; i++) { 348 partp = &mboot.parts[i]; 349 350 if (partp->dp_start == 0 && partp->dp_size == 0) 351 continue; 352 353 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 354 (u_long)partp->dp_start, (u_long)partp->dp_size); 355 356 /* Fill flags for the partition. */ 357 if (partp->dp_flag & 0x80) 358 printf("a %d\n", i + 1); 359 } 360 exit(0); 361 } 362 if (s_flag) { 363 if (read_s0()) 364 err(1, "read_s0"); 365 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 366 dos_sectors); 367 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 368 for (i = 0; i < NDOSPART; i++) { 369 partp = &mboot.parts[i]; 370 if (partp->dp_start == 0 && partp->dp_size == 0) 371 continue; 372 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 373 (u_long) partp->dp_start, 374 (u_long) partp->dp_size, partp->dp_typ, 375 partp->dp_flag); 376 } 377 exit(0); 378 } 379 380 printf("******* Working on device %s *******\n",disk); 381 382 if (I_flag) { 383 read_s0(); 384 reset_boot(); 385 partp = &mboot.parts[0]; 386 partp->dp_typ = DOSPTYP_386BSD; 387 partp->dp_flag = ACTIVE; 388 partp->dp_start = dos_sectors; 389 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 390 dos_sectors; 391 dos(partp); 392 if (v_flag) 393 print_s0(); 394 if (!t_flag) 395 write_s0(); 396 exit(0); 397 } 398 if (f_flag) { 399 if (read_s0() || i_flag) 400 reset_boot(); 401 if (!read_config(f_flag)) 402 exit(1); 403 if (v_flag) 404 print_s0(); 405 if (!t_flag) 406 write_s0(); 407 } else { 408 if(u_flag) 409 get_params_to_use(); 410 else 411 print_params(); 412 413 if (read_s0()) 414 init_sector0(dos_sectors); 415 416 printf("Media sector size is %d\n", secsize); 417 printf("Warning: BIOS sector numbering starts with sector 1\n"); 418 printf("Information from DOS bootblock is:\n"); 419 if (partition == -1) 420 for (i = 1; i <= NDOSPART; i++) 421 change_part(i); 422 else 423 change_part(partition); 424 425 if (u_flag || a_flag) 426 change_active(partition); 427 428 if (B_flag) 429 change_code(); 430 431 if (u_flag || a_flag || B_flag) { 432 if (!t_flag) { 433 printf("\nWe haven't changed the partition table yet. "); 434 printf("This is your last chance.\n"); 435 } 436 print_s0(); 437 if (!t_flag) { 438 if (ok("Should we write new partition table?")) 439 write_s0(); 440 } else { 441 printf("\n-t flag specified -- partition table not written.\n"); 442 } 443 } 444 } 445 446 exit(0); 447} 448 449static void 450usage() 451{ 452 fprintf(stderr, "%s%s", 453 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 454 " fdisk -f configfile [-itv] [disk]\n"); 455 exit(1); 456} 457 458static void 459print_s0(void) 460{ 461 int i; 462 463 print_params(); 464 printf("Information from DOS bootblock is:\n"); 465 for (i = 1; i <= NDOSPART; i++) { 466 printf("%d: ", i); 467 print_part(&mboot.parts[i - 1]); 468 } 469} 470 471static struct dos_partition mtpart; 472 473static void 474print_part(const struct dos_partition *partp) 475{ 476 u_int64_t part_mb; 477 478 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 479 printf("<UNUSED>\n"); 480 return; 481 } 482 /* 483 * Be careful not to overflow. 484 */ 485 part_mb = partp->dp_size; 486 part_mb *= secsize; 487 part_mb /= (1024 * 1024); 488 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 489 get_type(partp->dp_typ)); 490 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 491 (u_long)partp->dp_start, 492 (u_long)partp->dp_size, 493 (uintmax_t)part_mb, 494 partp->dp_flag, 495 partp->dp_flag == ACTIVE ? " (active)" : ""); 496 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 497 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 498 ,partp->dp_shd 499 ,DPSECT(partp->dp_ssect) 500 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 501 ,partp->dp_ehd 502 ,DPSECT(partp->dp_esect)); 503} 504 505 506static void 507init_boot(void) 508{ 509#ifndef __ia64__ 510 const char *fname; 511 int fdesc, n; 512 struct stat sb; 513 514 fname = b_flag ? b_flag : "/boot/mbr"; 515 if ((fdesc = open(fname, O_RDONLY)) == -1 || 516 fstat(fdesc, &sb) == -1) 517 err(1, "%s", fname); 518 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 519 errx(1, "%s: length must be a multiple of sector size", fname); 520 if (mboot.bootinst != NULL) 521 free(mboot.bootinst); 522 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 523 errx(1, "%s: unable to allocate read buffer", fname); 524 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 525 close(fdesc)) 526 err(1, "%s", fname); 527 if (n != mboot.bootinst_size) 528 errx(1, "%s: short read", fname); 529#else 530 if (mboot.bootinst != NULL) 531 free(mboot.bootinst); 532 mboot.bootinst_size = secsize; 533 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 534 errx(1, "unable to allocate boot block buffer"); 535 memset(mboot.bootinst, 0, mboot.bootinst_size); 536 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 537#endif 538} 539 540 541static void 542init_sector0(unsigned long start) 543{ 544 struct dos_partition *partp = &mboot.parts[0]; 545 546 init_boot(); 547 548 partp->dp_typ = DOSPTYP_386BSD; 549 partp->dp_flag = ACTIVE; 550 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 551 if(start == 0) 552 start = dos_sectors; 553 partp->dp_start = start; 554 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 555 556 dos(partp); 557} 558 559static void 560change_part(int i) 561{ 562 struct dos_partition *partp = &mboot.parts[i - 1]; 563 564 printf("The data for partition %d is:\n", i); 565 print_part(partp); 566 567 if (u_flag && ok("Do you want to change it?")) { 568 int tmp; 569 570 if (i_flag) { 571 bzero(partp, sizeof (*partp)); 572 if (i == 1) { 573 init_sector0(1); 574 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 575 print_part(partp); 576 } 577 } 578 579 do { 580 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); 581 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); 582 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); 583 if (!sanitize_partition(partp)) { 584 warnx("ERROR: failed to adjust; setting sysid to 0"); 585 partp->dp_typ = 0; 586 } 587 588 if (ok("Explicitly specify beg/end address ?")) 589 { 590 int tsec,tcyl,thd; 591 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 592 thd = partp->dp_shd; 593 tsec = DPSECT(partp->dp_ssect); 594 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 595 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); 596 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); 597 partp->dp_scyl = DOSCYL(tcyl); 598 partp->dp_ssect = DOSSECT(tsec,tcyl); 599 partp->dp_shd = thd; 600 601 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 602 thd = partp->dp_ehd; 603 tsec = DPSECT(partp->dp_esect); 604 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 605 Decimal("ending head", thd, tmp, NO_TRACK_HEADS); 606 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); 607 partp->dp_ecyl = DOSCYL(tcyl); 608 partp->dp_esect = DOSSECT(tsec,tcyl); 609 partp->dp_ehd = thd; 610 } else 611 dos(partp); 612 613 print_part(partp); 614 } while (!ok("Are we happy with this entry?")); 615 } 616} 617 618static void 619print_params() 620{ 621 printf("parameters extracted from in-core disklabel are:\n"); 622 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 623 ,cyls,heads,sectors,cylsecs); 624 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 625 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 626 printf("parameters to be used for BIOS calculations are:\n"); 627 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 628 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 629} 630 631static void 632change_active(int which) 633{ 634 struct dos_partition *partp = &mboot.parts[0]; 635 int active, i, new, tmp; 636 637 active = -1; 638 for (i = 0; i < NDOSPART; i++) { 639 if ((partp[i].dp_flag & ACTIVE) == 0) 640 continue; 641 printf("Partition %d is marked active\n", i + 1); 642 if (active == -1) 643 active = i + 1; 644 } 645 if (a_flag && which != -1) 646 active = which; 647 else if (active == -1) 648 active = 1; 649 650 if (!ok("Do you want to change the active partition?")) 651 return; 652setactive: 653 do { 654 new = active; 655 Decimal("active partition", new, tmp, 0); 656 if (new < 1 || new > 4) { 657 printf("Active partition number must be in range 1-4." 658 " Try again.\n"); 659 goto setactive; 660 } 661 active = new; 662 } while (!ok("Are you happy with this choice")); 663 for (i = 0; i < NDOSPART; i++) 664 partp[i].dp_flag = 0; 665 if (active > 0 && active <= NDOSPART) 666 partp[active-1].dp_flag = ACTIVE; 667} 668 669static void 670change_code() 671{ 672 if (ok("Do you want to change the boot code?")) 673 init_boot(); 674} 675 676void 677get_params_to_use() 678{ 679 int tmp; 680 print_params(); 681 if (ok("Do you want to change our idea of what BIOS thinks ?")) 682 { 683 do 684 { 685 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); 686 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); 687 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); 688 dos_cylsecs = dos_heads * dos_sectors; 689 print_params(); 690 } 691 while(!ok("Are you happy with this choice")); 692 } 693} 694 695 696/***********************************************\ 697* Change real numbers into strange dos numbers * 698\***********************************************/ 699static void 700dos(struct dos_partition *partp) 701{ 702 int cy, sec; 703 u_int32_t end; 704 705 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 706 memcpy(partp, &mtpart, sizeof(*partp)); 707 return; 708 } 709 710 /* Start c/h/s. */ 711 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 712 cy = partp->dp_start / dos_cylsecs; 713 sec = partp->dp_start % dos_sectors + 1; 714 partp->dp_scyl = DOSCYL(cy); 715 partp->dp_ssect = DOSSECT(sec, cy); 716 717 /* End c/h/s. */ 718 end = partp->dp_start + partp->dp_size - 1; 719 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 720 cy = end / dos_cylsecs; 721 sec = end % dos_sectors + 1; 722 partp->dp_ecyl = DOSCYL(cy); 723 partp->dp_esect = DOSSECT(sec, cy); 724} 725 726static int 727open_disk(int flag) 728{ 729 int rwmode; 730 731 /* Write mode if one of these flags are set. */ 732 rwmode = (a_flag || I_flag || B_flag || flag); 733 fd = g_open(disk, rwmode); 734 /* If the mode fails, try read-only if we didn't. */ 735 if (fd == -1 && errno == EPERM && rwmode) 736 fd = g_open(disk, 0); 737 if (fd == -1 && errno == ENXIO) 738 return -2; 739 if (fd == -1) { 740 warnx("can't open device %s", disk); 741 return -1; 742 } 743 if (get_params() == -1) { 744 warnx("can't get disk parameters on %s", disk); 745 return -1; 746 } 747 return fd; 748} 749 750static ssize_t 751read_disk(off_t sector, void *buf) 752{ 753 754 lseek(fd, (sector * 512), 0); 755 if (secsize == 0) 756 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 757 secsize *= 2) { 758 /* try the read */ 759 int size = read(fd, buf, secsize); 760 if (size == secsize) 761 /* it worked so return */ 762 return secsize; 763 } 764 else 765 return read(fd, buf, secsize); 766 767 /* we failed to read at any of the sizes */ 768 return -1; 769} 770 771static int 772geom_class_available(const char *name) 773{ 774 struct gclass *class; 775 struct gmesh mesh; 776 int error; 777 778 error = geom_gettree(&mesh); 779 if (error != 0) 780 errc(1, error, "Cannot get GEOM tree"); 781 782 LIST_FOREACH(class, &mesh.lg_class, lg_class) { 783 if (strcmp(class->lg_name, name) == 0) { 784 geom_deletetree(&mesh); 785 return (1); 786 } 787 } 788 789 geom_deletetree(&mesh); 790 791 return (0); 792} 793 794static int 795write_disk(off_t sector, void *buf) 796{ 797 struct gctl_req *grq; 798 const char *errmsg; 799 char *pname; 800 int error; 801 802 /* Check that GEOM_MBR is available */ 803 if (geom_class_available("MBR") != 0) { 804 grq = gctl_get_handle(); 805 gctl_ro_param(grq, "verb", -1, "write MBR"); 806 gctl_ro_param(grq, "class", -1, "MBR"); 807 pname = g_providername(fd); 808 if (pname == NULL) { 809 warn("Error getting providername for %s", disk); 810 return (-1); 811 } 812 gctl_ro_param(grq, "geom", -1, pname); 813 gctl_ro_param(grq, "data", secsize, buf); 814 errmsg = gctl_issue(grq); 815 free(pname); 816 if (errmsg == NULL) { 817 gctl_free(grq); 818 return(0); 819 } 820 if (!q_flag) 821 warnx("GEOM_MBR: %s", errmsg); 822 gctl_free(grq); 823 } else { 824 /* 825 * Try to write MBR directly. This may help when disk 826 * is not in use. 827 * XXX: hardcoded sectorsize 828 */ 829 error = pwrite(fd, buf, secsize, (sector * 512)); 830 if (error == secsize) 831 return (0); 832 } 833 834 /* 835 * GEOM_MBR is not available or failed to write MBR. 836 * Now check that we have GEOM_PART and recommend to use gpart (8). 837 */ 838 if (geom_class_available("PART") != 0) 839 warnx("Failed to write MBR. Try to use gpart(8)."); 840 else 841 warnx("Failed to write sector zero"); 842 return(EINVAL); 843} 844 845static int 846get_params() 847{ 848 int error; 849 u_int u; 850 off_t o; 851 852 error = ioctl(fd, DIOCGFWSECTORS, &u); 853 if (error == 0) 854 sectors = dos_sectors = u; 855 else 856 sectors = dos_sectors = 63; 857 858 error = ioctl(fd, DIOCGFWHEADS, &u); 859 if (error == 0) 860 heads = dos_heads = u; 861 else 862 heads = dos_heads = 255; 863 864 dos_cylsecs = cylsecs = heads * sectors; 865 disksecs = cyls * heads * sectors; 866 867 u = g_sectorsize(fd); 868 if (u <= 0) 869 return (-1); 870 871 o = g_mediasize(fd); 872 if (o < 0) 873 return (-1); 874 disksecs = o / u; 875 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 876 877 return (disksecs); 878} 879 880static int 881read_s0() 882{ 883 int i; 884 885 mboot.bootinst_size = secsize; 886 if (mboot.bootinst != NULL) 887 free(mboot.bootinst); 888 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 889 warnx("unable to allocate buffer to read fdisk " 890 "partition table"); 891 return -1; 892 } 893 if (read_disk(0, mboot.bootinst) == -1) { 894 warnx("can't read fdisk partition table"); 895 return -1; 896 } 897 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 898 warnx("invalid fdisk partition table found"); 899 /* So should we initialize things */ 900 return -1; 901 } 902 for (i = 0; i < NDOSPART; i++) 903 dos_partition_dec( 904 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 905 &mboot.parts[i]); 906 return 0; 907} 908 909static int 910write_s0() 911{ 912 int sector, i; 913 914 if (iotest) { 915 print_s0(); 916 return 0; 917 } 918 for(i = 0; i < NDOSPART; i++) 919 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 920 &mboot.parts[i]); 921 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 922 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 923 if (write_disk(sector, 924 &mboot.bootinst[sector * secsize]) == -1) { 925 warn("can't write fdisk partition table"); 926 return -1; 927 } 928 return(0); 929} 930 931 932static int 933ok(const char *str) 934{ 935 printf("%s [n] ", str); 936 fflush(stdout); 937 if (fgets(lbuf, LBUF, stdin) == NULL) 938 exit(1); 939 lbuf[strlen(lbuf)-1] = 0; 940 941 if (*lbuf && 942 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 943 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 944 return 1; 945 else 946 return 0; 947} 948 949static int 950decimal(const char *str, int *num, int deflt, uint32_t maxval) 951{ 952 long long acc; 953 int c; 954 char *cp; 955 956 while (1) { 957 acc = 0; 958 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 959 fflush(stdout); 960 if (fgets(lbuf, LBUF, stdin) == NULL) 961 exit(1); 962 lbuf[strlen(lbuf)-1] = 0; 963 964 if (!*lbuf) 965 return 0; 966 967 cp = lbuf; 968 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 969 if (!c) 970 return 0; 971 while ((c = *cp++)) { 972 if (c <= '9' && c >= '0') { 973 if (acc <= maxval || maxval == 0) 974 acc = acc * 10 + c - '0'; 975 } else 976 break; 977 } 978 if (c == ' ' || c == '\t') 979 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 980 if (!c) { 981 if (maxval > 0 && acc > maxval) { 982 acc = maxval; 983 printf("%s exceeds maximum value allowed for " 984 "this field. The value has been reduced " 985 "to %lld\n", lbuf, acc); 986 } 987 *num = acc; 988 return 1; 989 } else 990 printf("%s is an invalid decimal number. Try again.\n", 991 lbuf); 992 } 993} 994 995 996static void 997parse_config_line(char *line, CMD *command) 998{ 999 char *cp, *end; 1000 1001 cp = line; 1002 while (1) { 1003 memset(command, 0, sizeof(*command)); 1004 1005 while (isspace(*cp)) ++cp; 1006 if (*cp == '\0' || *cp == '#') 1007 break; 1008 command->cmd = *cp++; 1009 1010 /* 1011 * Parse args 1012 */ 1013 while (1) { 1014 while (isspace(*cp)) ++cp; 1015 if (*cp == '\0') 1016 break; /* eol */ 1017 if (*cp == '#') 1018 break; /* found comment */ 1019 if (isalpha(*cp)) 1020 command->args[command->n_args].argtype = *cp++; 1021 end = NULL; 1022 command->args[command->n_args].arg_val = strtoul(cp, &end, 0); 1023 if (cp == end || (!isspace(*end) && *end != '\0')) { 1024 char ch; 1025 end = cp; 1026 while (!isspace(*end) && *end != '\0') ++end; 1027 ch = *end; *end = '\0'; 1028 command->args[command->n_args].arg_str = strdup(cp); 1029 *end = ch; 1030 } else 1031 command->args[command->n_args].arg_str = NULL; 1032 cp = end; 1033 command->n_args++; 1034 } 1035 break; 1036 } 1037} 1038 1039 1040static int 1041process_geometry(CMD *command) 1042{ 1043 int status = 1, i; 1044 1045 while (1) { 1046 geom_processed = 1; 1047 if (part_processed) { 1048 warnx( 1049 "ERROR line %d: the geometry specification line must occur before\n\ 1050 all partition specifications", 1051 current_line_number); 1052 status = 0; 1053 break; 1054 } 1055 if (command->n_args != 3) { 1056 warnx("ERROR line %d: incorrect number of geometry args", 1057 current_line_number); 1058 status = 0; 1059 break; 1060 } 1061 dos_cyls = 0; 1062 dos_heads = 0; 1063 dos_sectors = 0; 1064 for (i = 0; i < 3; ++i) { 1065 switch (command->args[i].argtype) { 1066 case 'c': 1067 dos_cyls = command->args[i].arg_val; 1068 break; 1069 case 'h': 1070 dos_heads = command->args[i].arg_val; 1071 break; 1072 case 's': 1073 dos_sectors = command->args[i].arg_val; 1074 break; 1075 default: 1076 warnx( 1077 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1078 current_line_number, command->args[i].argtype, 1079 command->args[i].argtype); 1080 status = 0; 1081 break; 1082 } 1083 } 1084 if (status == 0) 1085 break; 1086 1087 dos_cylsecs = dos_heads * dos_sectors; 1088 1089 /* 1090 * Do sanity checks on parameter values 1091 */ 1092 if (dos_cyls == 0) { 1093 warnx("ERROR line %d: number of cylinders not specified", 1094 current_line_number); 1095 status = 0; 1096 } 1097 if (dos_cyls > 1024) { 1098 warnx( 1099 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1100 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1101 is dedicated to FreeBSD)", 1102 current_line_number, dos_cyls); 1103 } 1104 1105 if (dos_heads == 0) { 1106 warnx("ERROR line %d: number of heads not specified", 1107 current_line_number); 1108 status = 0; 1109 } else if (dos_heads > 256) { 1110 warnx("ERROR line %d: number of heads must be within (1-256)", 1111 current_line_number); 1112 status = 0; 1113 } 1114 1115 if (dos_sectors == 0) { 1116 warnx("ERROR line %d: number of sectors not specified", 1117 current_line_number); 1118 status = 0; 1119 } else if (dos_sectors > 63) { 1120 warnx("ERROR line %d: number of sectors must be within (1-63)", 1121 current_line_number); 1122 status = 0; 1123 } 1124 1125 break; 1126 } 1127 return (status); 1128} 1129 1130static u_int32_t 1131str2sectors(const char *str) 1132{ 1133 char *end; 1134 unsigned long val; 1135 1136 val = strtoul(str, &end, 0); 1137 if (str == end || *end == '\0') { 1138 warnx("ERROR line %d: unexpected size: \'%s\'", 1139 current_line_number, str); 1140 return NO_DISK_SECTORS; 1141 } 1142 1143 if (*end == 'K') 1144 val *= 1024UL / secsize; 1145 else if (*end == 'M') 1146 val *= 1024UL * 1024UL / secsize; 1147 else if (*end == 'G') 1148 val *= 1024UL * 1024UL * 1024UL / secsize; 1149 else { 1150 warnx("ERROR line %d: unexpected modifier: %c " 1151 "(not K/M/G)", current_line_number, *end); 1152 return NO_DISK_SECTORS; 1153 } 1154 1155 return val; 1156} 1157 1158static int 1159process_partition(CMD *command) 1160{ 1161 int status = 0, partition; 1162 u_int32_t prev_head_boundary, prev_cyl_boundary; 1163 u_int32_t adj_size, max_end; 1164 struct dos_partition *partp; 1165 1166 while (1) { 1167 part_processed = 1; 1168 if (command->n_args != 4) { 1169 warnx("ERROR line %d: incorrect number of partition args", 1170 current_line_number); 1171 break; 1172 } 1173 partition = command->args[0].arg_val; 1174 if (partition < 1 || partition > 4) { 1175 warnx("ERROR line %d: invalid partition number %d", 1176 current_line_number, partition); 1177 break; 1178 } 1179 partp = &mboot.parts[partition - 1]; 1180 bzero(partp, sizeof (*partp)); 1181 partp->dp_typ = command->args[1].arg_val; 1182 if (command->args[2].arg_str != NULL) { 1183 if (strcmp(command->args[2].arg_str, "*") == 0) { 1184 int i; 1185 partp->dp_start = dos_sectors; 1186 for (i = 1; i < partition; i++) { 1187 struct dos_partition *prev_partp; 1188 prev_partp = ((struct dos_partition *) 1189 &mboot.parts) + i - 1; 1190 if (prev_partp->dp_typ != 0) 1191 partp->dp_start = prev_partp->dp_start + 1192 prev_partp->dp_size; 1193 } 1194 if (partp->dp_start % dos_sectors != 0) { 1195 prev_head_boundary = partp->dp_start / 1196 dos_sectors * dos_sectors; 1197 partp->dp_start = prev_head_boundary + 1198 dos_sectors; 1199 } 1200 } else { 1201 partp->dp_start = str2sectors(command->args[2].arg_str); 1202 if (partp->dp_start == NO_DISK_SECTORS) 1203 break; 1204 } 1205 } else 1206 partp->dp_start = command->args[2].arg_val; 1207 1208 if (command->args[3].arg_str != NULL) { 1209 if (strcmp(command->args[3].arg_str, "*") == 0) 1210 partp->dp_size = ((disksecs / dos_cylsecs) * 1211 dos_cylsecs) - partp->dp_start; 1212 else { 1213 partp->dp_size = str2sectors(command->args[3].arg_str); 1214 if (partp->dp_size == NO_DISK_SECTORS) 1215 break; 1216 } 1217 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) / 1218 dos_cylsecs) * dos_cylsecs; 1219 if (prev_cyl_boundary > partp->dp_start) 1220 partp->dp_size = prev_cyl_boundary - partp->dp_start; 1221 } else 1222 partp->dp_size = command->args[3].arg_val; 1223 1224 max_end = partp->dp_start + partp->dp_size; 1225 1226 if (partp->dp_typ == 0) { 1227 /* 1228 * Get out, the partition is marked as unused. 1229 */ 1230 /* 1231 * Insure that it's unused. 1232 */ 1233 bzero(partp, sizeof(*partp)); 1234 status = 1; 1235 break; 1236 } 1237 1238 /* 1239 * Adjust start upwards, if necessary, to fall on a head boundary. 1240 */ 1241 if (partp->dp_start % dos_sectors != 0) { 1242 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1243 if (max_end < dos_sectors || 1244 prev_head_boundary > max_end - dos_sectors) { 1245 /* 1246 * Can't go past end of partition 1247 */ 1248 warnx( 1249 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1250 a head boundary", 1251 current_line_number, partition); 1252 break; 1253 } 1254 warnx( 1255 "WARNING: adjusting start offset of partition %d\n\ 1256 from %u to %u, to fall on a head boundary", 1257 partition, (u_int)partp->dp_start, 1258 (u_int)(prev_head_boundary + dos_sectors)); 1259 partp->dp_start = prev_head_boundary + dos_sectors; 1260 } 1261 1262 /* 1263 * Adjust size downwards, if necessary, to fall on a cylinder 1264 * boundary. 1265 */ 1266 prev_cyl_boundary = 1267 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1268 if (prev_cyl_boundary > partp->dp_start) 1269 adj_size = prev_cyl_boundary - partp->dp_start; 1270 else { 1271 warnx( 1272 "ERROR: could not adjust partition to start on a head boundary\n\ 1273 and end on a cylinder boundary."); 1274 return (0); 1275 } 1276 if (adj_size != partp->dp_size) { 1277 warnx( 1278 "WARNING: adjusting size of partition %d from %u to %u\n\ 1279 to end on a cylinder boundary", 1280 partition, (u_int)partp->dp_size, (u_int)adj_size); 1281 partp->dp_size = adj_size; 1282 } 1283 if (partp->dp_size == 0) { 1284 warnx("ERROR line %d: size of partition %d is zero", 1285 current_line_number, partition); 1286 break; 1287 } 1288 1289 dos(partp); 1290 status = 1; 1291 break; 1292 } 1293 return (status); 1294} 1295 1296 1297static int 1298process_active(CMD *command) 1299{ 1300 int status = 0, partition, i; 1301 struct dos_partition *partp; 1302 1303 while (1) { 1304 active_processed = 1; 1305 if (command->n_args != 1) { 1306 warnx("ERROR line %d: incorrect number of active args", 1307 current_line_number); 1308 status = 0; 1309 break; 1310 } 1311 partition = command->args[0].arg_val; 1312 if (partition < 1 || partition > 4) { 1313 warnx("ERROR line %d: invalid partition number %d", 1314 current_line_number, partition); 1315 break; 1316 } 1317 /* 1318 * Reset active partition 1319 */ 1320 partp = mboot.parts; 1321 for (i = 0; i < NDOSPART; i++) 1322 partp[i].dp_flag = 0; 1323 partp[partition-1].dp_flag = ACTIVE; 1324 1325 status = 1; 1326 break; 1327 } 1328 return (status); 1329} 1330 1331 1332static int 1333process_line(char *line) 1334{ 1335 CMD command; 1336 int status = 1; 1337 1338 while (1) { 1339 parse_config_line(line, &command); 1340 switch (command.cmd) { 1341 case 0: 1342 /* 1343 * Comment or blank line 1344 */ 1345 break; 1346 case 'g': 1347 /* 1348 * Set geometry 1349 */ 1350 status = process_geometry(&command); 1351 break; 1352 case 'p': 1353 status = process_partition(&command); 1354 break; 1355 case 'a': 1356 status = process_active(&command); 1357 break; 1358 default: 1359 status = 0; 1360 break; 1361 } 1362 break; 1363 } 1364 return (status); 1365} 1366 1367 1368static int 1369read_config(char *config_file) 1370{ 1371 FILE *fp = NULL; 1372 int status = 1; 1373 char buf[1010]; 1374 1375 while (1) { 1376 if (strcmp(config_file, "-") != 0) { 1377 /* 1378 * We're not reading from stdin 1379 */ 1380 if ((fp = fopen(config_file, "r")) == NULL) { 1381 status = 0; 1382 break; 1383 } 1384 } else { 1385 fp = stdin; 1386 } 1387 current_line_number = 0; 1388 while (!feof(fp)) { 1389 if (fgets(buf, sizeof(buf), fp) == NULL) 1390 break; 1391 ++current_line_number; 1392 status = process_line(buf); 1393 if (status == 0) 1394 break; 1395 } 1396 break; 1397 } 1398 if (fp) { 1399 /* 1400 * It doesn't matter if we're reading from stdin, as we've reached EOF 1401 */ 1402 fclose(fp); 1403 } 1404 return (status); 1405} 1406 1407 1408static void 1409reset_boot(void) 1410{ 1411 int i; 1412 struct dos_partition *partp; 1413 1414 init_boot(); 1415 for (i = 0; i < 4; ++i) { 1416 partp = &mboot.parts[i]; 1417 bzero(partp, sizeof(*partp)); 1418 } 1419} 1420 1421static int 1422sanitize_partition(struct dos_partition *partp) 1423{ 1424 u_int32_t prev_head_boundary, prev_cyl_boundary; 1425 u_int32_t max_end, size, start; 1426 1427 start = partp->dp_start; 1428 size = partp->dp_size; 1429 max_end = start + size; 1430 /* Only allow a zero size if the partition is being marked unused. */ 1431 if (size == 0) { 1432 if (start == 0 && partp->dp_typ == 0) 1433 return (1); 1434 warnx("ERROR: size of partition is zero"); 1435 return (0); 1436 } 1437 /* Return if no adjustment is necessary. */ 1438 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1439 return (1); 1440 1441 if (start == 0) { 1442 warnx("WARNING: partition overlaps with partition table"); 1443 if (ok("Correct this automatically?")) 1444 start = dos_sectors; 1445 } 1446 if (start % dos_sectors != 0) 1447 warnx("WARNING: partition does not start on a head boundary"); 1448 if ((start +size) % dos_sectors != 0) 1449 warnx("WARNING: partition does not end on a cylinder boundary"); 1450 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1451 if (!ok("Correct this automatically?")) 1452 return (1); 1453 1454 /* 1455 * Adjust start upwards, if necessary, to fall on a head boundary. 1456 */ 1457 if (start % dos_sectors != 0) { 1458 prev_head_boundary = start / dos_sectors * dos_sectors; 1459 if (max_end < dos_sectors || 1460 prev_head_boundary >= max_end - dos_sectors) { 1461 /* 1462 * Can't go past end of partition 1463 */ 1464 warnx( 1465 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1466 return (0); 1467 } 1468 start = prev_head_boundary + dos_sectors; 1469 } 1470 1471 /* 1472 * Adjust size downwards, if necessary, to fall on a cylinder 1473 * boundary. 1474 */ 1475 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1476 if (prev_cyl_boundary > start) 1477 size = prev_cyl_boundary - start; 1478 else { 1479 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1480 and end on a cylinder boundary."); 1481 return (0); 1482 } 1483 1484 /* Finally, commit any changes to partp and return. */ 1485 if (start != partp->dp_start) { 1486 warnx("WARNING: adjusting start offset of partition to %u", 1487 (u_int)start); 1488 partp->dp_start = start; 1489 } 1490 if (size != partp->dp_size) { 1491 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1492 partp->dp_size = size; 1493 } 1494 1495 return (1); 1496} 1497 1498/* 1499 * Try figuring out the root device's canonical disk name. 1500 * The following choices are considered: 1501 * /dev/ad0s1a => /dev/ad0 1502 * /dev/da0a => /dev/da0 1503 * /dev/vinum/root => /dev/vinum/root 1504 * A ".eli" part is removed if it exists (see geli(8)). 1505 * A ".journal" ending is removed if it exists (see gjournal(8)). 1506 */ 1507static char * 1508get_rootdisk(void) 1509{ 1510 struct statfs rootfs; 1511 regex_t re; 1512#define NMATCHES 2 1513 regmatch_t rm[NMATCHES]; 1514 char dev[PATH_MAX], *s; 1515 int rv; 1516 1517 if (statfs("/", &rootfs) == -1) 1518 err(1, "statfs(\"/\")"); 1519 1520 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", 1521 REG_EXTENDED)) != 0) 1522 errx(1, "regcomp() failed (%d)", rv); 1523 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); 1524 if ((s = strstr(dev, ".eli")) != NULL) 1525 memmove(s, s+4, strlen(s + 4) + 1); 1526 1527 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) 1528 errx(1, 1529"mounted root fs resource doesn't match expectations (regexec returned %d)", 1530 rv); 1531 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1532 errx(1, "out of memory"); 1533 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1534 rm[1].rm_eo - rm[1].rm_so); 1535 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1536 1537 return s; 1538} 1539