fdisk.c revision 225007
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 225007 2011-08-19 12:48:06Z ae $"); 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 [0xFE] = "SpeedStor >1024 cyl. or LANstep", 222 [0xFF] = "Xenix bad blocks table", 223}; 224 225static const char * 226get_type(int t) 227{ 228 const char *ret; 229 230 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL; 231 return ret ? ret : "unknown"; 232} 233 234 235static void print_s0(void); 236static void print_part(const struct dos_partition *); 237static void init_sector0(unsigned long start); 238static void init_boot(void); 239static void change_part(int i); 240static void print_params(void); 241static void change_active(int which); 242static void change_code(void); 243static void get_params_to_use(void); 244static char *get_rootdisk(void); 245static void dos(struct dos_partition *partp); 246static int open_disk(int flag); 247static ssize_t read_disk(off_t sector, void *buf); 248static int write_disk(off_t sector, void *buf); 249static int get_params(void); 250static int read_s0(void); 251static int write_s0(void); 252static int ok(const char *str); 253static int decimal(const char *str, int *num, int deflt, uint32_t maxval); 254static int read_config(char *config_file); 255static void reset_boot(void); 256static int sanitize_partition(struct dos_partition *); 257static void usage(void); 258 259int 260main(int argc, char *argv[]) 261{ 262 int c, i; 263 int partition = -1; 264 struct dos_partition *partp; 265 266 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 267 switch (c) { 268 case 'B': 269 B_flag = 1; 270 break; 271 case 'I': 272 I_flag = 1; 273 break; 274 case 'a': 275 a_flag = 1; 276 break; 277 case 'b': 278 b_flag = optarg; 279 break; 280 case 'f': 281 f_flag = optarg; 282 break; 283 case 'i': 284 i_flag = 1; 285 break; 286 case 'p': 287 print_config_flag = 1; 288 break; 289 case 'q': 290 q_flag = 1; 291 break; 292 case 's': 293 s_flag = 1; 294 break; 295 case 't': 296 t_flag = 1; 297 break; 298 case 'u': 299 u_flag = 1; 300 break; 301 case 'v': 302 v_flag = 1; 303 break; 304 case '1': 305 case '2': 306 case '3': 307 case '4': 308 partition = c - '0'; 309 break; 310 default: 311 usage(); 312 } 313 if (f_flag || i_flag) 314 u_flag = 1; 315 if (t_flag) 316 v_flag = 1; 317 argc -= optind; 318 argv += optind; 319 320 if (argc == 0) { 321 disk = get_rootdisk(); 322 } else { 323 disk = g_device_path(argv[0]); 324 if (disk == NULL) 325 err(1, "unable to get correct path for %s", argv[0]); 326 } 327 if (open_disk(u_flag) < 0) 328 err(1, "cannot open disk %s", disk); 329 330 /* (abu)use mboot.bootinst to probe for the sector size */ 331 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 332 err(1, "cannot allocate buffer to determine disk sector size"); 333 if (read_disk(0, mboot.bootinst) == -1) 334 errx(1, "could not detect sector size"); 335 free(mboot.bootinst); 336 mboot.bootinst = NULL; 337 338 if (print_config_flag) { 339 if (read_s0()) 340 err(1, "read_s0"); 341 342 printf("# %s\n", disk); 343 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 344 345 for (i = 0; i < NDOSPART; i++) { 346 partp = &mboot.parts[i]; 347 348 if (partp->dp_start == 0 && partp->dp_size == 0) 349 continue; 350 351 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 352 (u_long)partp->dp_start, (u_long)partp->dp_size); 353 354 /* Fill flags for the partition. */ 355 if (partp->dp_flag & 0x80) 356 printf("a %d\n", i + 1); 357 } 358 exit(0); 359 } 360 if (s_flag) { 361 if (read_s0()) 362 err(1, "read_s0"); 363 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 364 dos_sectors); 365 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 366 for (i = 0; i < NDOSPART; i++) { 367 partp = &mboot.parts[i]; 368 if (partp->dp_start == 0 && partp->dp_size == 0) 369 continue; 370 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 371 (u_long) partp->dp_start, 372 (u_long) partp->dp_size, partp->dp_typ, 373 partp->dp_flag); 374 } 375 exit(0); 376 } 377 378 printf("******* Working on device %s *******\n",disk); 379 380 if (I_flag) { 381 read_s0(); 382 reset_boot(); 383 partp = &mboot.parts[0]; 384 partp->dp_typ = DOSPTYP_386BSD; 385 partp->dp_flag = ACTIVE; 386 partp->dp_start = dos_sectors; 387 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 388 dos_sectors; 389 dos(partp); 390 if (v_flag) 391 print_s0(); 392 if (!t_flag) 393 write_s0(); 394 exit(0); 395 } 396 if (f_flag) { 397 if (read_s0() || i_flag) 398 reset_boot(); 399 if (!read_config(f_flag)) 400 exit(1); 401 if (v_flag) 402 print_s0(); 403 if (!t_flag) 404 write_s0(); 405 } else { 406 if(u_flag) 407 get_params_to_use(); 408 else 409 print_params(); 410 411 if (read_s0()) 412 init_sector0(dos_sectors); 413 414 printf("Media sector size is %d\n", secsize); 415 printf("Warning: BIOS sector numbering starts with sector 1\n"); 416 printf("Information from DOS bootblock is:\n"); 417 if (partition == -1) 418 for (i = 1; i <= NDOSPART; i++) 419 change_part(i); 420 else 421 change_part(partition); 422 423 if (u_flag || a_flag) 424 change_active(partition); 425 426 if (B_flag) 427 change_code(); 428 429 if (u_flag || a_flag || B_flag) { 430 if (!t_flag) { 431 printf("\nWe haven't changed the partition table yet. "); 432 printf("This is your last chance.\n"); 433 } 434 print_s0(); 435 if (!t_flag) { 436 if (ok("Should we write new partition table?")) 437 write_s0(); 438 } else { 439 printf("\n-t flag specified -- partition table not written.\n"); 440 } 441 } 442 } 443 444 exit(0); 445} 446 447static void 448usage() 449{ 450 fprintf(stderr, "%s%s", 451 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 452 " fdisk -f configfile [-itv] [disk]\n"); 453 exit(1); 454} 455 456static void 457print_s0(void) 458{ 459 int i; 460 461 print_params(); 462 printf("Information from DOS bootblock is:\n"); 463 for (i = 1; i <= NDOSPART; i++) { 464 printf("%d: ", i); 465 print_part(&mboot.parts[i - 1]); 466 } 467} 468 469static struct dos_partition mtpart; 470 471static void 472print_part(const struct dos_partition *partp) 473{ 474 u_int64_t part_mb; 475 476 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 477 printf("<UNUSED>\n"); 478 return; 479 } 480 /* 481 * Be careful not to overflow. 482 */ 483 part_mb = partp->dp_size; 484 part_mb *= secsize; 485 part_mb /= (1024 * 1024); 486 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 487 get_type(partp->dp_typ)); 488 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 489 (u_long)partp->dp_start, 490 (u_long)partp->dp_size, 491 (uintmax_t)part_mb, 492 partp->dp_flag, 493 partp->dp_flag == ACTIVE ? " (active)" : ""); 494 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 495 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 496 ,partp->dp_shd 497 ,DPSECT(partp->dp_ssect) 498 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 499 ,partp->dp_ehd 500 ,DPSECT(partp->dp_esect)); 501} 502 503 504static void 505init_boot(void) 506{ 507#ifndef __ia64__ 508 const char *fname; 509 int fdesc, n; 510 struct stat sb; 511 512 fname = b_flag ? b_flag : "/boot/mbr"; 513 if ((fdesc = open(fname, O_RDONLY)) == -1 || 514 fstat(fdesc, &sb) == -1) 515 err(1, "%s", fname); 516 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 517 errx(1, "%s: length must be a multiple of sector size", fname); 518 if (mboot.bootinst != NULL) 519 free(mboot.bootinst); 520 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 521 errx(1, "%s: unable to allocate read buffer", fname); 522 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 523 close(fdesc)) 524 err(1, "%s", fname); 525 if (n != mboot.bootinst_size) 526 errx(1, "%s: short read", fname); 527#else 528 if (mboot.bootinst != NULL) 529 free(mboot.bootinst); 530 mboot.bootinst_size = secsize; 531 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 532 errx(1, "unable to allocate boot block buffer"); 533 memset(mboot.bootinst, 0, mboot.bootinst_size); 534 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 535#endif 536} 537 538 539static void 540init_sector0(unsigned long start) 541{ 542 struct dos_partition *partp = &mboot.parts[0]; 543 544 init_boot(); 545 546 partp->dp_typ = DOSPTYP_386BSD; 547 partp->dp_flag = ACTIVE; 548 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 549 if(start == 0) 550 start = dos_sectors; 551 partp->dp_start = start; 552 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 553 554 dos(partp); 555} 556 557static void 558change_part(int i) 559{ 560 struct dos_partition *partp = &mboot.parts[i - 1]; 561 562 printf("The data for partition %d is:\n", i); 563 print_part(partp); 564 565 if (u_flag && ok("Do you want to change it?")) { 566 int tmp; 567 568 if (i_flag) { 569 bzero(partp, sizeof (*partp)); 570 if (i == 1) { 571 init_sector0(1); 572 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 573 print_part(partp); 574 } 575 } 576 577 do { 578 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); 579 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); 580 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); 581 if (!sanitize_partition(partp)) { 582 warnx("ERROR: failed to adjust; setting sysid to 0"); 583 partp->dp_typ = 0; 584 } 585 586 if (ok("Explicitly specify beg/end address ?")) 587 { 588 int tsec,tcyl,thd; 589 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 590 thd = partp->dp_shd; 591 tsec = DPSECT(partp->dp_ssect); 592 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 593 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); 594 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); 595 partp->dp_scyl = DOSCYL(tcyl); 596 partp->dp_ssect = DOSSECT(tsec,tcyl); 597 partp->dp_shd = thd; 598 599 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 600 thd = partp->dp_ehd; 601 tsec = DPSECT(partp->dp_esect); 602 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 603 Decimal("ending head", thd, tmp, NO_TRACK_HEADS); 604 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); 605 partp->dp_ecyl = DOSCYL(tcyl); 606 partp->dp_esect = DOSSECT(tsec,tcyl); 607 partp->dp_ehd = thd; 608 } else 609 dos(partp); 610 611 print_part(partp); 612 } while (!ok("Are we happy with this entry?")); 613 } 614} 615 616static void 617print_params() 618{ 619 printf("parameters extracted from in-core disklabel are:\n"); 620 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 621 ,cyls,heads,sectors,cylsecs); 622 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 623 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 624 printf("parameters to be used for BIOS calculations are:\n"); 625 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 626 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 627} 628 629static void 630change_active(int which) 631{ 632 struct dos_partition *partp = &mboot.parts[0]; 633 int active, i, new, tmp; 634 635 active = -1; 636 for (i = 0; i < NDOSPART; i++) { 637 if ((partp[i].dp_flag & ACTIVE) == 0) 638 continue; 639 printf("Partition %d is marked active\n", i + 1); 640 if (active == -1) 641 active = i + 1; 642 } 643 if (a_flag && which != -1) 644 active = which; 645 else if (active == -1) 646 active = 1; 647 648 if (!ok("Do you want to change the active partition?")) 649 return; 650setactive: 651 do { 652 new = active; 653 Decimal("active partition", new, tmp, 0); 654 if (new < 1 || new > 4) { 655 printf("Active partition number must be in range 1-4." 656 " Try again.\n"); 657 goto setactive; 658 } 659 active = new; 660 } while (!ok("Are you happy with this choice")); 661 for (i = 0; i < NDOSPART; i++) 662 partp[i].dp_flag = 0; 663 if (active > 0 && active <= NDOSPART) 664 partp[active-1].dp_flag = ACTIVE; 665} 666 667static void 668change_code() 669{ 670 if (ok("Do you want to change the boot code?")) 671 init_boot(); 672} 673 674void 675get_params_to_use() 676{ 677 int tmp; 678 print_params(); 679 if (ok("Do you want to change our idea of what BIOS thinks ?")) 680 { 681 do 682 { 683 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); 684 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); 685 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); 686 dos_cylsecs = dos_heads * dos_sectors; 687 print_params(); 688 } 689 while(!ok("Are you happy with this choice")); 690 } 691} 692 693 694/***********************************************\ 695* Change real numbers into strange dos numbers * 696\***********************************************/ 697static void 698dos(struct dos_partition *partp) 699{ 700 int cy, sec; 701 u_int32_t end; 702 703 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 704 memcpy(partp, &mtpart, sizeof(*partp)); 705 return; 706 } 707 708 /* Start c/h/s. */ 709 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 710 cy = partp->dp_start / dos_cylsecs; 711 sec = partp->dp_start % dos_sectors + 1; 712 partp->dp_scyl = DOSCYL(cy); 713 partp->dp_ssect = DOSSECT(sec, cy); 714 715 /* End c/h/s. */ 716 end = partp->dp_start + partp->dp_size - 1; 717 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 718 cy = end / dos_cylsecs; 719 sec = end % dos_sectors + 1; 720 partp->dp_ecyl = DOSCYL(cy); 721 partp->dp_esect = DOSSECT(sec, cy); 722} 723 724static int 725open_disk(int flag) 726{ 727 int rwmode; 728 729 /* Write mode if one of these flags are set. */ 730 rwmode = (a_flag || I_flag || B_flag || flag); 731 fd = g_open(disk, rwmode); 732 /* If the mode fails, try read-only if we didn't. */ 733 if (fd == -1 && errno == EPERM && rwmode) 734 fd = g_open(disk, 0); 735 if (fd == -1 && errno == ENXIO) 736 return -2; 737 if (fd == -1) { 738 warnx("can't open device %s", disk); 739 return -1; 740 } 741 if (get_params() == -1) { 742 warnx("can't get disk parameters on %s", disk); 743 return -1; 744 } 745 return fd; 746} 747 748static ssize_t 749read_disk(off_t sector, void *buf) 750{ 751 752 lseek(fd, (sector * 512), 0); 753 if (secsize == 0) 754 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 755 secsize *= 2) { 756 /* try the read */ 757 int size = read(fd, buf, secsize); 758 if (size == secsize) 759 /* it worked so return */ 760 return secsize; 761 } 762 else 763 return read(fd, buf, secsize); 764 765 /* we failed to read at any of the sizes */ 766 return -1; 767} 768 769static int 770write_disk(off_t sector, void *buf) 771{ 772 int error; 773 struct gctl_req *grq; 774 const char *errmsg; 775 char fbuf[BUFSIZ], *pname; 776 int i, fdw; 777 778 grq = gctl_get_handle(); 779 gctl_ro_param(grq, "verb", -1, "write MBR"); 780 gctl_ro_param(grq, "class", -1, "MBR"); 781 pname = g_providername(fd); 782 if (pname == NULL) { 783 warn("Error getting providername for %s", disk); 784 return (-1); 785 } 786 gctl_ro_param(grq, "geom", -1, pname); 787 gctl_ro_param(grq, "data", secsize, buf); 788 errmsg = gctl_issue(grq); 789 free(pname); 790 if (errmsg == NULL) { 791 gctl_free(grq); 792 return(0); 793 } 794 if (!q_flag) /* GEOM errors are benign, not all devices supported */ 795 warnx("%s", errmsg); 796 gctl_free(grq); 797 798 error = pwrite(fd, buf, secsize, (sector * 512)); 799 if (error == secsize) 800 return (0); 801 802 for (i = 1; i < 5; i++) { 803 sprintf(fbuf, "%ss%d", disk, i); 804 fdw = open(fbuf, O_RDWR, 0); 805 if (fdw < 0) 806 continue; 807 error = ioctl(fdw, DIOCSMBR, buf); 808 close(fdw); 809 if (error == 0) 810 return (0); 811 } 812 warnx("Failed to write sector zero"); 813 return(EINVAL); 814} 815 816static int 817get_params() 818{ 819 int error; 820 u_int u; 821 off_t o; 822 823 error = ioctl(fd, DIOCGFWSECTORS, &u); 824 if (error == 0) 825 sectors = dos_sectors = u; 826 else 827 sectors = dos_sectors = 63; 828 829 error = ioctl(fd, DIOCGFWHEADS, &u); 830 if (error == 0) 831 heads = dos_heads = u; 832 else 833 heads = dos_heads = 255; 834 835 dos_cylsecs = cylsecs = heads * sectors; 836 disksecs = cyls * heads * sectors; 837 838 u = g_sectorsize(fd); 839 if (u <= 0) 840 return (-1); 841 842 o = g_mediasize(fd); 843 if (o < 0) 844 return (-1); 845 disksecs = o / u; 846 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 847 848 return (disksecs); 849} 850 851static int 852read_s0() 853{ 854 int i; 855 856 mboot.bootinst_size = secsize; 857 if (mboot.bootinst != NULL) 858 free(mboot.bootinst); 859 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 860 warnx("unable to allocate buffer to read fdisk " 861 "partition table"); 862 return -1; 863 } 864 if (read_disk(0, mboot.bootinst) == -1) { 865 warnx("can't read fdisk partition table"); 866 return -1; 867 } 868 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 869 warnx("invalid fdisk partition table found"); 870 /* So should we initialize things */ 871 return -1; 872 } 873 for (i = 0; i < NDOSPART; i++) 874 dos_partition_dec( 875 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 876 &mboot.parts[i]); 877 return 0; 878} 879 880static int 881write_s0() 882{ 883 int sector, i; 884 885 if (iotest) { 886 print_s0(); 887 return 0; 888 } 889 for(i = 0; i < NDOSPART; i++) 890 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 891 &mboot.parts[i]); 892 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 893 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 894 if (write_disk(sector, 895 &mboot.bootinst[sector * secsize]) == -1) { 896 warn("can't write fdisk partition table"); 897 return -1; 898 } 899 return(0); 900} 901 902 903static int 904ok(const char *str) 905{ 906 printf("%s [n] ", str); 907 fflush(stdout); 908 if (fgets(lbuf, LBUF, stdin) == NULL) 909 exit(1); 910 lbuf[strlen(lbuf)-1] = 0; 911 912 if (*lbuf && 913 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 914 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 915 return 1; 916 else 917 return 0; 918} 919 920static int 921decimal(const char *str, int *num, int deflt, uint32_t maxval) 922{ 923 long long acc = 0; 924 int c; 925 char *cp; 926 927 while (1) { 928 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 929 fflush(stdout); 930 if (fgets(lbuf, LBUF, stdin) == NULL) 931 exit(1); 932 lbuf[strlen(lbuf)-1] = 0; 933 934 if (!*lbuf) 935 return 0; 936 937 cp = lbuf; 938 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 939 if (!c) 940 return 0; 941 while ((c = *cp++)) { 942 if (c <= '9' && c >= '0') { 943 if (acc <= maxval || maxval == 0) 944 acc = acc * 10 + c - '0'; 945 } else 946 break; 947 } 948 if (c == ' ' || c == '\t') 949 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 950 if (!c) { 951 if (maxval > 0 && acc > maxval) { 952 acc = maxval; 953 printf("%s exceeds maximum value allowed for " 954 "this field. The value has been reduced " 955 "to %lld\n", lbuf, acc); 956 } 957 *num = acc; 958 return 1; 959 } else 960 printf("%s is an invalid decimal number. Try again.\n", 961 lbuf); 962 } 963 964} 965 966 967static void 968parse_config_line(char *line, CMD *command) 969{ 970 char *cp, *end; 971 972 cp = line; 973 while (1) { 974 memset(command, 0, sizeof(*command)); 975 976 while (isspace(*cp)) ++cp; 977 if (*cp == '\0' || *cp == '#') 978 break; 979 command->cmd = *cp++; 980 981 /* 982 * Parse args 983 */ 984 while (1) { 985 while (isspace(*cp)) ++cp; 986 if (*cp == '\0') 987 break; /* eol */ 988 if (*cp == '#') 989 break; /* found comment */ 990 if (isalpha(*cp)) 991 command->args[command->n_args].argtype = *cp++; 992 end = NULL; 993 command->args[command->n_args].arg_val = strtoul(cp, &end, 0); 994 if (cp == end || (!isspace(*end) && *end != '\0')) { 995 char ch; 996 end = cp; 997 while (!isspace(*end) && *end != '\0') ++end; 998 ch = *end; *end = '\0'; 999 command->args[command->n_args].arg_str = strdup(cp); 1000 *end = ch; 1001 } else 1002 command->args[command->n_args].arg_str = NULL; 1003 cp = end; 1004 command->n_args++; 1005 } 1006 break; 1007 } 1008} 1009 1010 1011static int 1012process_geometry(CMD *command) 1013{ 1014 int status = 1, i; 1015 1016 while (1) { 1017 geom_processed = 1; 1018 if (part_processed) { 1019 warnx( 1020 "ERROR line %d: the geometry specification line must occur before\n\ 1021 all partition specifications", 1022 current_line_number); 1023 status = 0; 1024 break; 1025 } 1026 if (command->n_args != 3) { 1027 warnx("ERROR line %d: incorrect number of geometry args", 1028 current_line_number); 1029 status = 0; 1030 break; 1031 } 1032 dos_cyls = 0; 1033 dos_heads = 0; 1034 dos_sectors = 0; 1035 for (i = 0; i < 3; ++i) { 1036 switch (command->args[i].argtype) { 1037 case 'c': 1038 dos_cyls = command->args[i].arg_val; 1039 break; 1040 case 'h': 1041 dos_heads = command->args[i].arg_val; 1042 break; 1043 case 's': 1044 dos_sectors = command->args[i].arg_val; 1045 break; 1046 default: 1047 warnx( 1048 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1049 current_line_number, command->args[i].argtype, 1050 command->args[i].argtype); 1051 status = 0; 1052 break; 1053 } 1054 } 1055 if (status == 0) 1056 break; 1057 1058 dos_cylsecs = dos_heads * dos_sectors; 1059 1060 /* 1061 * Do sanity checks on parameter values 1062 */ 1063 if (dos_cyls == 0) { 1064 warnx("ERROR line %d: number of cylinders not specified", 1065 current_line_number); 1066 status = 0; 1067 } 1068 if (dos_cyls > 1024) { 1069 warnx( 1070 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1071 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1072 is dedicated to FreeBSD)", 1073 current_line_number, dos_cyls); 1074 } 1075 1076 if (dos_heads == 0) { 1077 warnx("ERROR line %d: number of heads not specified", 1078 current_line_number); 1079 status = 0; 1080 } else if (dos_heads > 256) { 1081 warnx("ERROR line %d: number of heads must be within (1-256)", 1082 current_line_number); 1083 status = 0; 1084 } 1085 1086 if (dos_sectors == 0) { 1087 warnx("ERROR line %d: number of sectors not specified", 1088 current_line_number); 1089 status = 0; 1090 } else if (dos_sectors > 63) { 1091 warnx("ERROR line %d: number of sectors must be within (1-63)", 1092 current_line_number); 1093 status = 0; 1094 } 1095 1096 break; 1097 } 1098 return (status); 1099} 1100 1101static u_int32_t 1102str2sectors(const char *str) 1103{ 1104 char *end; 1105 unsigned long val; 1106 1107 val = strtoul(str, &end, 0); 1108 if (str == end || *end == '\0') { 1109 warnx("ERROR line %d: unexpected size: \'%s\'", 1110 current_line_number, str); 1111 return NO_DISK_SECTORS; 1112 } 1113 1114 if (*end == 'K') 1115 val *= 1024UL / secsize; 1116 else if (*end == 'M') 1117 val *= 1024UL * 1024UL / secsize; 1118 else if (*end == 'G') 1119 val *= 1024UL * 1024UL * 1024UL / secsize; 1120 else { 1121 warnx("ERROR line %d: unexpected modifier: %c " 1122 "(not K/M/G)", current_line_number, *end); 1123 return NO_DISK_SECTORS; 1124 } 1125 1126 return val; 1127} 1128 1129static int 1130process_partition(CMD *command) 1131{ 1132 int status = 0, partition; 1133 u_int32_t prev_head_boundary, prev_cyl_boundary; 1134 u_int32_t adj_size, max_end; 1135 struct dos_partition *partp; 1136 1137 while (1) { 1138 part_processed = 1; 1139 if (command->n_args != 4) { 1140 warnx("ERROR line %d: incorrect number of partition args", 1141 current_line_number); 1142 break; 1143 } 1144 partition = command->args[0].arg_val; 1145 if (partition < 1 || partition > 4) { 1146 warnx("ERROR line %d: invalid partition number %d", 1147 current_line_number, partition); 1148 break; 1149 } 1150 partp = &mboot.parts[partition - 1]; 1151 bzero(partp, sizeof (*partp)); 1152 partp->dp_typ = command->args[1].arg_val; 1153 if (command->args[2].arg_str != NULL) { 1154 if (strcmp(command->args[2].arg_str, "*") == 0) { 1155 int i; 1156 partp->dp_start = dos_sectors; 1157 for (i = 1; i < partition; i++) { 1158 struct dos_partition *prev_partp; 1159 prev_partp = ((struct dos_partition *) 1160 &mboot.parts) + i - 1; 1161 if (prev_partp->dp_typ != 0) 1162 partp->dp_start = prev_partp->dp_start + 1163 prev_partp->dp_size; 1164 } 1165 if (partp->dp_start % dos_sectors != 0) { 1166 prev_head_boundary = partp->dp_start / 1167 dos_sectors * dos_sectors; 1168 partp->dp_start = prev_head_boundary + 1169 dos_sectors; 1170 } 1171 } else { 1172 partp->dp_start = str2sectors(command->args[2].arg_str); 1173 if (partp->dp_start == NO_DISK_SECTORS) 1174 break; 1175 } 1176 } else 1177 partp->dp_start = command->args[2].arg_val; 1178 1179 if (command->args[3].arg_str != NULL) { 1180 if (strcmp(command->args[3].arg_str, "*") == 0) 1181 partp->dp_size = ((disksecs / dos_cylsecs) * 1182 dos_cylsecs) - partp->dp_start; 1183 else { 1184 partp->dp_size = str2sectors(command->args[3].arg_str); 1185 if (partp->dp_size == NO_DISK_SECTORS) 1186 break; 1187 } 1188 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) / 1189 dos_cylsecs) * dos_cylsecs; 1190 if (prev_cyl_boundary > partp->dp_start) 1191 partp->dp_size = prev_cyl_boundary - partp->dp_start; 1192 } else 1193 partp->dp_size = command->args[3].arg_val; 1194 1195 max_end = partp->dp_start + partp->dp_size; 1196 1197 if (partp->dp_typ == 0) { 1198 /* 1199 * Get out, the partition is marked as unused. 1200 */ 1201 /* 1202 * Insure that it's unused. 1203 */ 1204 bzero(partp, sizeof(*partp)); 1205 status = 1; 1206 break; 1207 } 1208 1209 /* 1210 * Adjust start upwards, if necessary, to fall on a head boundary. 1211 */ 1212 if (partp->dp_start % dos_sectors != 0) { 1213 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1214 if (max_end < dos_sectors || 1215 prev_head_boundary > max_end - dos_sectors) { 1216 /* 1217 * Can't go past end of partition 1218 */ 1219 warnx( 1220 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1221 a head boundary", 1222 current_line_number, partition); 1223 break; 1224 } 1225 warnx( 1226 "WARNING: adjusting start offset of partition %d\n\ 1227 from %u to %u, to fall on a head boundary", 1228 partition, (u_int)partp->dp_start, 1229 (u_int)(prev_head_boundary + dos_sectors)); 1230 partp->dp_start = prev_head_boundary + dos_sectors; 1231 } 1232 1233 /* 1234 * Adjust size downwards, if necessary, to fall on a cylinder 1235 * boundary. 1236 */ 1237 prev_cyl_boundary = 1238 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1239 if (prev_cyl_boundary > partp->dp_start) 1240 adj_size = prev_cyl_boundary - partp->dp_start; 1241 else { 1242 warnx( 1243 "ERROR: could not adjust partition to start on a head boundary\n\ 1244 and end on a cylinder boundary."); 1245 return (0); 1246 } 1247 if (adj_size != partp->dp_size) { 1248 warnx( 1249 "WARNING: adjusting size of partition %d from %u to %u\n\ 1250 to end on a cylinder boundary", 1251 partition, (u_int)partp->dp_size, (u_int)adj_size); 1252 partp->dp_size = adj_size; 1253 } 1254 if (partp->dp_size == 0) { 1255 warnx("ERROR line %d: size of partition %d is zero", 1256 current_line_number, partition); 1257 break; 1258 } 1259 1260 dos(partp); 1261 status = 1; 1262 break; 1263 } 1264 return (status); 1265} 1266 1267 1268static int 1269process_active(CMD *command) 1270{ 1271 int status = 0, partition, i; 1272 struct dos_partition *partp; 1273 1274 while (1) { 1275 active_processed = 1; 1276 if (command->n_args != 1) { 1277 warnx("ERROR line %d: incorrect number of active args", 1278 current_line_number); 1279 status = 0; 1280 break; 1281 } 1282 partition = command->args[0].arg_val; 1283 if (partition < 1 || partition > 4) { 1284 warnx("ERROR line %d: invalid partition number %d", 1285 current_line_number, partition); 1286 break; 1287 } 1288 /* 1289 * Reset active partition 1290 */ 1291 partp = mboot.parts; 1292 for (i = 0; i < NDOSPART; i++) 1293 partp[i].dp_flag = 0; 1294 partp[partition-1].dp_flag = ACTIVE; 1295 1296 status = 1; 1297 break; 1298 } 1299 return (status); 1300} 1301 1302 1303static int 1304process_line(char *line) 1305{ 1306 CMD command; 1307 int status = 1; 1308 1309 while (1) { 1310 parse_config_line(line, &command); 1311 switch (command.cmd) { 1312 case 0: 1313 /* 1314 * Comment or blank line 1315 */ 1316 break; 1317 case 'g': 1318 /* 1319 * Set geometry 1320 */ 1321 status = process_geometry(&command); 1322 break; 1323 case 'p': 1324 status = process_partition(&command); 1325 break; 1326 case 'a': 1327 status = process_active(&command); 1328 break; 1329 default: 1330 status = 0; 1331 break; 1332 } 1333 break; 1334 } 1335 return (status); 1336} 1337 1338 1339static int 1340read_config(char *config_file) 1341{ 1342 FILE *fp = NULL; 1343 int status = 1; 1344 char buf[1010]; 1345 1346 while (1) { 1347 if (strcmp(config_file, "-") != 0) { 1348 /* 1349 * We're not reading from stdin 1350 */ 1351 if ((fp = fopen(config_file, "r")) == NULL) { 1352 status = 0; 1353 break; 1354 } 1355 } else { 1356 fp = stdin; 1357 } 1358 current_line_number = 0; 1359 while (!feof(fp)) { 1360 if (fgets(buf, sizeof(buf), fp) == NULL) 1361 break; 1362 ++current_line_number; 1363 status = process_line(buf); 1364 if (status == 0) 1365 break; 1366 } 1367 break; 1368 } 1369 if (fp) { 1370 /* 1371 * It doesn't matter if we're reading from stdin, as we've reached EOF 1372 */ 1373 fclose(fp); 1374 } 1375 return (status); 1376} 1377 1378 1379static void 1380reset_boot(void) 1381{ 1382 int i; 1383 struct dos_partition *partp; 1384 1385 init_boot(); 1386 for (i = 0; i < 4; ++i) { 1387 partp = &mboot.parts[i]; 1388 bzero(partp, sizeof(*partp)); 1389 } 1390} 1391 1392static int 1393sanitize_partition(struct dos_partition *partp) 1394{ 1395 u_int32_t prev_head_boundary, prev_cyl_boundary; 1396 u_int32_t max_end, size, start; 1397 1398 start = partp->dp_start; 1399 size = partp->dp_size; 1400 max_end = start + size; 1401 /* Only allow a zero size if the partition is being marked unused. */ 1402 if (size == 0) { 1403 if (start == 0 && partp->dp_typ == 0) 1404 return (1); 1405 warnx("ERROR: size of partition is zero"); 1406 return (0); 1407 } 1408 /* Return if no adjustment is necessary. */ 1409 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1410 return (1); 1411 1412 if (start == 0) { 1413 warnx("WARNING: partition overlaps with partition table"); 1414 if (ok("Correct this automatically?")) 1415 start = dos_sectors; 1416 } 1417 if (start % dos_sectors != 0) 1418 warnx("WARNING: partition does not start on a head boundary"); 1419 if ((start +size) % dos_sectors != 0) 1420 warnx("WARNING: partition does not end on a cylinder boundary"); 1421 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1422 if (!ok("Correct this automatically?")) 1423 return (1); 1424 1425 /* 1426 * Adjust start upwards, if necessary, to fall on a head boundary. 1427 */ 1428 if (start % dos_sectors != 0) { 1429 prev_head_boundary = start / dos_sectors * dos_sectors; 1430 if (max_end < dos_sectors || 1431 prev_head_boundary >= max_end - dos_sectors) { 1432 /* 1433 * Can't go past end of partition 1434 */ 1435 warnx( 1436 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1437 return (0); 1438 } 1439 start = prev_head_boundary + dos_sectors; 1440 } 1441 1442 /* 1443 * Adjust size downwards, if necessary, to fall on a cylinder 1444 * boundary. 1445 */ 1446 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1447 if (prev_cyl_boundary > start) 1448 size = prev_cyl_boundary - start; 1449 else { 1450 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1451 and end on a cylinder boundary."); 1452 return (0); 1453 } 1454 1455 /* Finally, commit any changes to partp and return. */ 1456 if (start != partp->dp_start) { 1457 warnx("WARNING: adjusting start offset of partition to %u", 1458 (u_int)start); 1459 partp->dp_start = start; 1460 } 1461 if (size != partp->dp_size) { 1462 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1463 partp->dp_size = size; 1464 } 1465 1466 return (1); 1467} 1468 1469/* 1470 * Try figuring out the root device's canonical disk name. 1471 * The following choices are considered: 1472 * /dev/ad0s1a => /dev/ad0 1473 * /dev/da0a => /dev/da0 1474 * /dev/vinum/root => /dev/vinum/root 1475 * A ".eli" part is removed if it exists (see geli(8)). 1476 * A ".journal" ending is removed if it exists (see gjournal(8)). 1477 */ 1478static char * 1479get_rootdisk(void) 1480{ 1481 struct statfs rootfs; 1482 regex_t re; 1483#define NMATCHES 2 1484 regmatch_t rm[NMATCHES]; 1485 char dev[PATH_MAX], *s; 1486 int rv; 1487 1488 if (statfs("/", &rootfs) == -1) 1489 err(1, "statfs(\"/\")"); 1490 1491 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", 1492 REG_EXTENDED)) != 0) 1493 errx(1, "regcomp() failed (%d)", rv); 1494 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); 1495 if ((s = strstr(dev, ".eli")) != NULL) 1496 memmove(s, s+4, strlen(s + 4) + 1); 1497 1498 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) 1499 errx(1, 1500"mounted root fs resource doesn't match expectations (regexec returned %d)", 1501 rv); 1502 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1503 errx(1, "out of memory"); 1504 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1505 rm[1].rm_eo - rm[1].rm_so); 1506 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1507 1508 return s; 1509} 1510