fdisk.c revision 298861
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 298861 2016-04-30 19:58:54Z pfg $"); 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 50static int 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 MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 71#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 72static int secsize = 0; /* the sensed sector size */ 73 74static char *disk; 75 76static int cyls, sectors, heads, cylsecs; 77static u_int32_t disksecs; 78 79struct mboot { 80 unsigned char *bootinst; /* boot code */ 81 off_t bootinst_size; 82 struct dos_partition parts[NDOSPART]; 83}; 84 85static struct mboot mboot; 86static int fd; 87 88#define ACTIVE 0x80 89 90static uint dos_cyls; 91static uint dos_heads; 92static uint dos_sectors; 93static uint dos_cylsecs; 94 95#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 96#define DOSCYL(c) (c & 0xff) 97 98#define MAX_ARGS 10 99 100static int current_line_number; 101 102static int geom_processed = 0; 103static int part_processed = 0; 104static int active_processed = 0; 105 106typedef struct cmd { 107 char cmd; 108 int n_args; 109 struct arg { 110 char argtype; 111 unsigned long arg_val; 112 char * arg_str; 113 } args[MAX_ARGS]; 114} CMD; 115 116static int B_flag = 0; /* replace boot code */ 117static int I_flag = 0; /* use entire disk for FreeBSD */ 118static int a_flag = 0; /* set active partition */ 119static char *b_flag = NULL; /* path to boot code */ 120static int i_flag = 0; /* replace partition data */ 121static int q_flag = 0; /* Be quiet */ 122static int u_flag = 0; /* update partition data */ 123static int s_flag = 0; /* Print a summary and exit */ 124static int t_flag = 0; /* test only */ 125static char *f_flag = NULL; /* Read config info from file */ 126static int v_flag = 0; /* Be verbose */ 127static int print_config_flag = 0; 128 129/* 130 * A list of partition types, probably outdated. 131 */ 132static const char *const part_types[256] = { 133 [0x00] = "unused", 134 [0x01] = "Primary DOS with 12 bit FAT", 135 [0x02] = "XENIX / file system", 136 [0x03] = "XENIX /usr file system", 137 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)", 138 [0x05] = "Extended DOS", 139 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)", 140 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX", 141 [0x08] = "AIX file system or SplitDrive", 142 [0x09] = "AIX boot partition or Coherent", 143 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap", 144 [0x0B] = "DOS or Windows 95 with 32 bit FAT", 145 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)", 146 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)", 147 [0x0F] = "Extended DOS (LBA)", 148 [0x10] = "OPUS", 149 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT", 150 [0x12] = "Compaq diagnostics", 151 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)", 152 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)", 153 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)", 154 [0x18] = "AST Windows swapfile", 155 [0x1b] = "ASUS Recovery partition (NTFS)", 156 [0x24] = "NEC DOS", 157 [0x3C] = "PartitionMagic recovery", 158 [0x39] = "plan9", 159 [0x40] = "VENIX 286", 160 [0x41] = "Linux/MINIX (sharing disk with DRDOS)", 161 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)", 162 [0x43] = "Linux native (sharing disk with DRDOS)", 163 [0x4D] = "QNX 4.2 Primary", 164 [0x4E] = "QNX 4.2 Secondary", 165 [0x4F] = "QNX 4.2 Tertiary", 166 [0x50] = "DM (disk manager)", 167 [0x51] = "DM6 Aux1 (or Novell)", 168 [0x52] = "CP/M or Microport SysV/AT", 169 [0x53] = "DM6 Aux3", 170 [0x54] = "DM6", 171 [0x55] = "EZ-Drive (disk manager)", 172 [0x56] = "Golden Bow (disk manager)", 173 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */ 174 [0x61] = "SpeedStor", 175 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach", 176 [0x64] = "Novell Netware/286 2.xx", 177 [0x65] = "Novell Netware/386 3.xx", 178 [0x70] = "DiskSecure Multi-Boot", 179 [0x75] = "PCIX", 180 [0x77] = "QNX4.x", 181 [0x78] = "QNX4.x 2nd part", 182 [0x79] = "QNX4.x 3rd part", 183 [0x80] = "Minix until 1.4a", 184 [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager", 185 [0x82] = "Linux swap or Solaris x86", 186 [0x83] = "Linux native", 187 [0x84] = "OS/2 hidden C: drive", 188 [0x85] = "Linux extended", 189 [0x86] = "NTFS volume set??", 190 [0x87] = "NTFS volume set??", 191 [0x93] = "Amoeba file system", 192 [0x94] = "Amoeba bad block table", 193 [0x9F] = "BSD/OS", 194 [0xA0] = "Suspend to Disk", 195 [0xA5] = "FreeBSD/NetBSD/386BSD", 196 [0xA6] = "OpenBSD", 197 [0xA7] = "NeXTSTEP", 198 [0xA9] = "NetBSD", 199 [0xAC] = "IBM JFS", 200 [0xAF] = "HFS+", 201 [0xB7] = "BSDI BSD/386 file system", 202 [0xB8] = "BSDI BSD/386 swap", 203 [0xBE] = "Solaris x86 boot", 204 [0xBF] = "Solaris x86 (new)", 205 [0xC1] = "DRDOS/sec with 12-bit FAT", 206 [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)", 207 [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)", 208 [0xC7] = "Syrinx", 209 [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS", 210 [0xDE] = "DELL Utilities - FAT filesystem", 211 [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition", 212 [0xE3] = "DOS R/O or SpeedStor", 213 [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.", 214 [0xEB] = "BeOS file system", 215 [0xEE] = "EFI GPT", 216 [0xEF] = "EFI System Partition", 217 [0xF1] = "SpeedStor", 218 [0xF2] = "DOS 3.3+ Secondary", 219 [0xF4] = "SpeedStor large partition", 220 [0xFB] = "VMware VMFS", 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 int geom_class_available(const char *); 236static void print_s0(void); 237static void print_part(const struct dos_partition *); 238static void init_sector0(unsigned long start); 239static void init_boot(void); 240static void change_part(int i); 241static void print_params(void); 242static void change_active(int which); 243static void change_code(void); 244static void get_params_to_use(void); 245static char *get_rootdisk(void); 246static void dos(struct dos_partition *partp); 247static int open_disk(int flag); 248static ssize_t read_disk(off_t sector, void *buf); 249static int write_disk(off_t sector, void *buf); 250static int get_params(void); 251static int read_s0(void); 252static int write_s0(void); 253static int ok(const char *str); 254static int decimal(const char *str, int *num, int deflt, uint32_t maxval); 255static int read_config(char *config_file); 256static void reset_boot(void); 257static int sanitize_partition(struct dos_partition *); 258static void usage(void); 259 260int 261main(int argc, char *argv[]) 262{ 263 int c, i; 264 int partition = -1; 265 struct dos_partition *partp; 266 267 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 268 switch (c) { 269 case 'B': 270 B_flag = 1; 271 break; 272 case 'I': 273 I_flag = 1; 274 break; 275 case 'a': 276 a_flag = 1; 277 break; 278 case 'b': 279 b_flag = optarg; 280 break; 281 case 'f': 282 f_flag = optarg; 283 break; 284 case 'i': 285 i_flag = 1; 286 break; 287 case 'p': 288 print_config_flag = 1; 289 break; 290 case 'q': 291 q_flag = 1; 292 break; 293 case 's': 294 s_flag = 1; 295 break; 296 case 't': 297 t_flag = 1; 298 break; 299 case 'u': 300 u_flag = 1; 301 break; 302 case 'v': 303 v_flag = 1; 304 break; 305 case '1': 306 case '2': 307 case '3': 308 case '4': 309 partition = c - '0'; 310 break; 311 default: 312 usage(); 313 } 314 if (f_flag || i_flag) 315 u_flag = 1; 316 if (t_flag) 317 v_flag = 1; 318 argc -= optind; 319 argv += optind; 320 321 if (argc == 0) { 322 disk = get_rootdisk(); 323 } else { 324 disk = g_device_path(argv[0]); 325 if (disk == NULL) 326 err(1, "unable to get correct path for %s", argv[0]); 327 } 328 if (open_disk(u_flag) < 0) 329 err(1, "cannot open disk %s", disk); 330 331 /* (abu)use mboot.bootinst to probe for the sector size */ 332 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 333 err(1, "cannot allocate buffer to determine disk sector size"); 334 if (read_disk(0, mboot.bootinst) == -1) 335 errx(1, "could not detect sector size"); 336 free(mboot.bootinst); 337 mboot.bootinst = NULL; 338 339 if (print_config_flag) { 340 if (read_s0()) 341 err(1, "read_s0"); 342 343 printf("# %s\n", disk); 344 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 345 346 for (i = 0; i < NDOSPART; i++) { 347 partp = &mboot.parts[i]; 348 349 if (partp->dp_start == 0 && partp->dp_size == 0) 350 continue; 351 352 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 353 (u_long)partp->dp_start, (u_long)partp->dp_size); 354 355 /* Fill flags for the partition. */ 356 if (partp->dp_flag & 0x80) 357 printf("a %d\n", i + 1); 358 } 359 exit(0); 360 } 361 if (s_flag) { 362 if (read_s0()) 363 err(1, "read_s0"); 364 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 365 dos_sectors); 366 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 367 for (i = 0; i < NDOSPART; i++) { 368 partp = &mboot.parts[i]; 369 if (partp->dp_start == 0 && partp->dp_size == 0) 370 continue; 371 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 372 (u_long) partp->dp_start, 373 (u_long) partp->dp_size, partp->dp_typ, 374 partp->dp_flag); 375 } 376 exit(0); 377 } 378 379 printf("******* Working on device %s *******\n",disk); 380 381 if (I_flag) { 382 read_s0(); 383 reset_boot(); 384 partp = &mboot.parts[0]; 385 partp->dp_typ = DOSPTYP_386BSD; 386 partp->dp_flag = ACTIVE; 387 partp->dp_start = dos_sectors; 388 partp->dp_size = rounddown(disksecs, dos_cylsecs) - 389 dos_sectors; 390 dos(partp); 391 if (v_flag) 392 print_s0(); 393 if (!t_flag) 394 write_s0(); 395 exit(0); 396 } 397 if (f_flag) { 398 if (read_s0() || i_flag) 399 reset_boot(); 400 if (!read_config(f_flag)) 401 exit(1); 402 if (v_flag) 403 print_s0(); 404 if (!t_flag) 405 write_s0(); 406 } else { 407 if(u_flag) 408 get_params_to_use(); 409 else 410 print_params(); 411 412 if (read_s0()) 413 init_sector0(dos_sectors); 414 415 printf("Media sector size is %d\n", secsize); 416 printf("Warning: BIOS sector numbering starts with sector 1\n"); 417 printf("Information from DOS bootblock is:\n"); 418 if (partition == -1) 419 for (i = 1; i <= NDOSPART; i++) 420 change_part(i); 421 else 422 change_part(partition); 423 424 if (u_flag || a_flag) 425 change_active(partition); 426 427 if (B_flag) 428 change_code(); 429 430 if (u_flag || a_flag || B_flag) { 431 if (!t_flag) { 432 printf("\nWe haven't changed the partition table yet. "); 433 printf("This is your last chance.\n"); 434 } 435 print_s0(); 436 if (!t_flag) { 437 if (ok("Should we write new partition table?")) 438 write_s0(); 439 } else { 440 printf("\n-t flag specified -- partition table not written.\n"); 441 } 442 } 443 } 444 445 exit(0); 446} 447 448static void 449usage() 450{ 451 fprintf(stderr, "%s%s", 452 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 453 " fdisk -f configfile [-itv] [disk]\n"); 454 exit(1); 455} 456 457static void 458print_s0(void) 459{ 460 int i; 461 462 print_params(); 463 printf("Information from DOS bootblock is:\n"); 464 for (i = 1; i <= NDOSPART; i++) { 465 printf("%d: ", i); 466 print_part(&mboot.parts[i - 1]); 467 } 468} 469 470static struct dos_partition mtpart; 471 472static void 473print_part(const struct dos_partition *partp) 474{ 475 u_int64_t part_mb; 476 477 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 478 printf("<UNUSED>\n"); 479 return; 480 } 481 /* 482 * Be careful not to overflow. 483 */ 484 part_mb = partp->dp_size; 485 part_mb *= secsize; 486 part_mb /= (1024 * 1024); 487 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 488 get_type(partp->dp_typ)); 489 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 490 (u_long)partp->dp_start, 491 (u_long)partp->dp_size, 492 (uintmax_t)part_mb, 493 partp->dp_flag, 494 partp->dp_flag == ACTIVE ? " (active)" : ""); 495 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 496 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 497 ,partp->dp_shd 498 ,DPSECT(partp->dp_ssect) 499 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 500 ,partp->dp_ehd 501 ,DPSECT(partp->dp_esect)); 502} 503 504 505static void 506init_boot(void) 507{ 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 (sb.st_size == 0) 517 errx(1, "%s is empty, must not be.", 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} 530 531 532static void 533init_sector0(unsigned long start) 534{ 535 struct dos_partition *partp = &mboot.parts[0]; 536 537 init_boot(); 538 539 partp->dp_typ = DOSPTYP_386BSD; 540 partp->dp_flag = ACTIVE; 541 start = roundup(start, dos_sectors); 542 if(start == 0) 543 start = dos_sectors; 544 partp->dp_start = start; 545 partp->dp_size = rounddown(disksecs, dos_cylsecs) - start; 546 547 dos(partp); 548} 549 550static void 551change_part(int i) 552{ 553 struct dos_partition *partp = &mboot.parts[i - 1]; 554 555 printf("The data for partition %d is:\n", i); 556 print_part(partp); 557 558 if (u_flag && ok("Do you want to change it?")) { 559 int tmp; 560 561 if (i_flag) { 562 bzero(partp, sizeof (*partp)); 563 if (i == 1) { 564 init_sector0(1); 565 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 566 print_part(partp); 567 } 568 } 569 570 do { 571 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); 572 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); 573 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); 574 if (!sanitize_partition(partp)) { 575 warnx("ERROR: failed to adjust; setting sysid to 0"); 576 partp->dp_typ = 0; 577 } 578 579 if (ok("Explicitly specify beg/end address ?")) 580 { 581 int tsec,tcyl,thd; 582 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 583 thd = partp->dp_shd; 584 tsec = DPSECT(partp->dp_ssect); 585 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 586 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); 587 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); 588 partp->dp_scyl = DOSCYL(tcyl); 589 partp->dp_ssect = DOSSECT(tsec,tcyl); 590 partp->dp_shd = thd; 591 592 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 593 thd = partp->dp_ehd; 594 tsec = DPSECT(partp->dp_esect); 595 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 596 Decimal("ending head", thd, tmp, NO_TRACK_HEADS); 597 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); 598 partp->dp_ecyl = DOSCYL(tcyl); 599 partp->dp_esect = DOSSECT(tsec,tcyl); 600 partp->dp_ehd = thd; 601 } else 602 dos(partp); 603 604 print_part(partp); 605 } while (!ok("Are we happy with this entry?")); 606 } 607} 608 609static void 610print_params() 611{ 612 printf("parameters extracted from in-core disklabel are:\n"); 613 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 614 ,cyls,heads,sectors,cylsecs); 615 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 616 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 617 printf("parameters to be used for BIOS calculations are:\n"); 618 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 619 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 620} 621 622static void 623change_active(int which) 624{ 625 struct dos_partition *partp = &mboot.parts[0]; 626 int active, i, new, tmp; 627 628 active = -1; 629 for (i = 0; i < NDOSPART; i++) { 630 if ((partp[i].dp_flag & ACTIVE) == 0) 631 continue; 632 printf("Partition %d is marked active\n", i + 1); 633 if (active == -1) 634 active = i + 1; 635 } 636 if (a_flag && which != -1) 637 active = which; 638 else if (active == -1) 639 active = 1; 640 641 if (!ok("Do you want to change the active partition?")) 642 return; 643setactive: 644 do { 645 new = active; 646 Decimal("active partition", new, tmp, 0); 647 if (new < 1 || new > 4) { 648 printf("Active partition number must be in range 1-4." 649 " Try again.\n"); 650 goto setactive; 651 } 652 active = new; 653 } while (!ok("Are you happy with this choice")); 654 for (i = 0; i < NDOSPART; i++) 655 partp[i].dp_flag = 0; 656 if (active > 0 && active <= NDOSPART) 657 partp[active-1].dp_flag = ACTIVE; 658} 659 660static void 661change_code() 662{ 663 if (ok("Do you want to change the boot code?")) 664 init_boot(); 665} 666 667void 668get_params_to_use() 669{ 670 int tmp; 671 print_params(); 672 if (ok("Do you want to change our idea of what BIOS thinks ?")) 673 { 674 do 675 { 676 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); 677 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); 678 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); 679 dos_cylsecs = dos_heads * dos_sectors; 680 print_params(); 681 } 682 while(!ok("Are you happy with this choice")); 683 } 684} 685 686 687/***********************************************\ 688* Change real numbers into strange dos numbers * 689\***********************************************/ 690static void 691dos(struct dos_partition *partp) 692{ 693 int cy, sec; 694 u_int32_t end; 695 696 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 697 memcpy(partp, &mtpart, sizeof(*partp)); 698 return; 699 } 700 701 /* Start c/h/s. */ 702 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 703 cy = partp->dp_start / dos_cylsecs; 704 sec = partp->dp_start % dos_sectors + 1; 705 partp->dp_scyl = DOSCYL(cy); 706 partp->dp_ssect = DOSSECT(sec, cy); 707 708 /* End c/h/s. */ 709 end = partp->dp_start + partp->dp_size - 1; 710 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 711 cy = end / dos_cylsecs; 712 sec = end % dos_sectors + 1; 713 partp->dp_ecyl = DOSCYL(cy); 714 partp->dp_esect = DOSSECT(sec, cy); 715} 716 717static int 718open_disk(int flag) 719{ 720 int rwmode; 721 722 /* Write mode if one of these flags are set. */ 723 rwmode = (a_flag || I_flag || B_flag || flag); 724 fd = g_open(disk, rwmode); 725 /* If the mode fails, try read-only if we didn't. */ 726 if (fd == -1 && errno == EPERM && rwmode) 727 fd = g_open(disk, 0); 728 if (fd == -1 && errno == ENXIO) 729 return -2; 730 if (fd == -1) { 731 warnx("can't open device %s", disk); 732 return -1; 733 } 734 if (get_params() == -1) { 735 warnx("can't get disk parameters on %s", disk); 736 return -1; 737 } 738 return fd; 739} 740 741static ssize_t 742read_disk(off_t sector, void *buf) 743{ 744 745 lseek(fd, (sector * 512), 0); 746 if (secsize == 0) 747 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 748 secsize *= 2) { 749 /* try the read */ 750 int size = read(fd, buf, secsize); 751 if (size == secsize) 752 /* it worked so return */ 753 return secsize; 754 } 755 else 756 return read(fd, buf, secsize); 757 758 /* we failed to read at any of the sizes */ 759 return -1; 760} 761 762static int 763geom_class_available(const char *name) 764{ 765 struct gclass *class; 766 struct gmesh mesh; 767 int error; 768 769 error = geom_gettree(&mesh); 770 if (error != 0) 771 errc(1, error, "Cannot get GEOM tree"); 772 773 LIST_FOREACH(class, &mesh.lg_class, lg_class) { 774 if (strcmp(class->lg_name, name) == 0) { 775 geom_deletetree(&mesh); 776 return (1); 777 } 778 } 779 780 geom_deletetree(&mesh); 781 782 return (0); 783} 784 785static int 786write_disk(off_t sector, void *buf) 787{ 788 struct gctl_req *grq; 789 const char *errmsg; 790 char *pname; 791 int error; 792 793 /* Check that GEOM_MBR is available */ 794 if (geom_class_available("MBR") != 0) { 795 grq = gctl_get_handle(); 796 gctl_ro_param(grq, "verb", -1, "write MBR"); 797 gctl_ro_param(grq, "class", -1, "MBR"); 798 pname = g_providername(fd); 799 if (pname == NULL) { 800 warn("Error getting providername for %s", disk); 801 return (-1); 802 } 803 gctl_ro_param(grq, "geom", -1, pname); 804 gctl_ro_param(grq, "data", secsize, buf); 805 errmsg = gctl_issue(grq); 806 free(pname); 807 if (errmsg == NULL) { 808 gctl_free(grq); 809 return(0); 810 } 811 if (!q_flag) 812 warnx("GEOM_MBR: %s", errmsg); 813 gctl_free(grq); 814 } else { 815 /* 816 * Try to write MBR directly. This may help when disk 817 * is not in use. 818 * XXX: hardcoded sectorsize 819 */ 820 error = pwrite(fd, buf, secsize, (sector * 512)); 821 if (error == secsize) 822 return (0); 823 } 824 825 /* 826 * GEOM_MBR is not available or failed to write MBR. 827 * Now check that we have GEOM_PART and recommend to use gpart (8). 828 */ 829 if (geom_class_available("PART") != 0) 830 warnx("Failed to write MBR. Try to use gpart(8)."); 831 else 832 warnx("Failed to write sector zero"); 833 return(EINVAL); 834} 835 836static int 837get_params() 838{ 839 int error; 840 u_int u; 841 off_t o; 842 843 error = ioctl(fd, DIOCGFWSECTORS, &u); 844 if (error == 0) 845 sectors = dos_sectors = u; 846 else 847 sectors = dos_sectors = 63; 848 849 error = ioctl(fd, DIOCGFWHEADS, &u); 850 if (error == 0) 851 heads = dos_heads = u; 852 else 853 heads = dos_heads = 255; 854 855 dos_cylsecs = cylsecs = heads * sectors; 856 disksecs = cyls * heads * sectors; 857 858 u = g_sectorsize(fd); 859 if (u <= 0) 860 return (-1); 861 862 o = g_mediasize(fd); 863 if (o < 0) 864 return (-1); 865 if (o / u <= NO_DISK_SECTORS) 866 disksecs = o / u; 867 else 868 disksecs = NO_DISK_SECTORS; 869 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 870 871 return (0); 872} 873 874static int 875read_s0() 876{ 877 int i; 878 879 mboot.bootinst_size = secsize; 880 if (mboot.bootinst != NULL) 881 free(mboot.bootinst); 882 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 883 warnx("unable to allocate buffer to read fdisk " 884 "partition table"); 885 return -1; 886 } 887 if (read_disk(0, mboot.bootinst) == -1) { 888 warnx("can't read fdisk partition table"); 889 return -1; 890 } 891 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 892 warnx("invalid fdisk partition table found"); 893 /* So should we initialize things */ 894 return -1; 895 } 896 for (i = 0; i < NDOSPART; i++) 897 dos_partition_dec( 898 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 899 &mboot.parts[i]); 900 return 0; 901} 902 903static int 904write_s0() 905{ 906 int sector, i; 907 908 if (iotest) { 909 print_s0(); 910 return 0; 911 } 912 for(i = 0; i < NDOSPART; i++) 913 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 914 &mboot.parts[i]); 915 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 916 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 917 if (write_disk(sector, 918 &mboot.bootinst[sector * secsize]) == -1) { 919 warn("can't write fdisk partition table"); 920 return -1; 921 } 922 return(0); 923} 924 925 926static int 927ok(const char *str) 928{ 929 printf("%s [n] ", str); 930 fflush(stdout); 931 if (fgets(lbuf, LBUF, stdin) == NULL) 932 exit(1); 933 lbuf[strlen(lbuf)-1] = 0; 934 935 if (*lbuf && 936 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 937 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 938 return 1; 939 else 940 return 0; 941} 942 943static int 944decimal(const char *str, int *num, int deflt, uint32_t maxval) 945{ 946 long long acc; 947 int c; 948 char *cp; 949 950 while (1) { 951 acc = 0; 952 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 953 fflush(stdout); 954 if (fgets(lbuf, LBUF, stdin) == NULL) 955 exit(1); 956 lbuf[strlen(lbuf)-1] = 0; 957 958 if (!*lbuf) 959 return 0; 960 961 cp = lbuf; 962 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 963 if (!c) 964 return 0; 965 while ((c = *cp++)) { 966 if (c <= '9' && c >= '0') { 967 if (acc <= maxval || maxval == 0) 968 acc = acc * 10 + c - '0'; 969 } else 970 break; 971 } 972 if (c == ' ' || c == '\t') 973 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 974 if (!c) { 975 if (maxval > 0 && acc > maxval) { 976 acc = maxval; 977 printf("%s exceeds maximum value allowed for " 978 "this field. The value has been reduced " 979 "to %lld\n", lbuf, acc); 980 } 981 *num = acc; 982 return 1; 983 } else 984 printf("%s is an invalid decimal number. Try again.\n", 985 lbuf); 986 } 987} 988 989 990static void 991parse_config_line(char *line, CMD *command) 992{ 993 char *cp, *end; 994 995 cp = line; 996 while (1) { 997 memset(command, 0, sizeof(*command)); 998 999 while (isspace(*cp)) ++cp; 1000 if (*cp == '\0' || *cp == '#') 1001 break; 1002 command->cmd = *cp++; 1003 1004 /* 1005 * Parse args 1006 */ 1007 while (1) { 1008 while (isspace(*cp)) ++cp; 1009 if (*cp == '\0') 1010 break; /* eol */ 1011 if (*cp == '#') 1012 break; /* found comment */ 1013 if (isalpha(*cp)) 1014 command->args[command->n_args].argtype = *cp++; 1015 end = NULL; 1016 command->args[command->n_args].arg_val = strtoul(cp, &end, 0); 1017 if (cp == end || (!isspace(*end) && *end != '\0')) { 1018 char ch; 1019 end = cp; 1020 while (!isspace(*end) && *end != '\0') ++end; 1021 ch = *end; *end = '\0'; 1022 command->args[command->n_args].arg_str = strdup(cp); 1023 *end = ch; 1024 } else 1025 command->args[command->n_args].arg_str = NULL; 1026 cp = end; 1027 command->n_args++; 1028 } 1029 break; 1030 } 1031} 1032 1033 1034static int 1035process_geometry(CMD *command) 1036{ 1037 int status = 1, i; 1038 1039 while (1) { 1040 geom_processed = 1; 1041 if (part_processed) { 1042 warnx( 1043 "ERROR line %d: the geometry specification line must occur before\n\ 1044 all partition specifications", 1045 current_line_number); 1046 status = 0; 1047 break; 1048 } 1049 if (command->n_args != 3) { 1050 warnx("ERROR line %d: incorrect number of geometry args", 1051 current_line_number); 1052 status = 0; 1053 break; 1054 } 1055 dos_cyls = 0; 1056 dos_heads = 0; 1057 dos_sectors = 0; 1058 for (i = 0; i < 3; ++i) { 1059 switch (command->args[i].argtype) { 1060 case 'c': 1061 dos_cyls = command->args[i].arg_val; 1062 break; 1063 case 'h': 1064 dos_heads = command->args[i].arg_val; 1065 break; 1066 case 's': 1067 dos_sectors = command->args[i].arg_val; 1068 break; 1069 default: 1070 warnx( 1071 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1072 current_line_number, command->args[i].argtype, 1073 command->args[i].argtype); 1074 status = 0; 1075 break; 1076 } 1077 } 1078 if (status == 0) 1079 break; 1080 1081 dos_cylsecs = dos_heads * dos_sectors; 1082 1083 /* 1084 * Do sanity checks on parameter values 1085 */ 1086 if (dos_cyls == 0) { 1087 warnx("ERROR line %d: number of cylinders not specified", 1088 current_line_number); 1089 status = 0; 1090 } 1091 if (dos_cyls > 1024) { 1092 warnx( 1093 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1094 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1095 is dedicated to FreeBSD)", 1096 current_line_number, dos_cyls); 1097 } 1098 1099 if (dos_heads == 0) { 1100 warnx("ERROR line %d: number of heads not specified", 1101 current_line_number); 1102 status = 0; 1103 } else if (dos_heads > 256) { 1104 warnx("ERROR line %d: number of heads must be within (1-256)", 1105 current_line_number); 1106 status = 0; 1107 } 1108 1109 if (dos_sectors == 0) { 1110 warnx("ERROR line %d: number of sectors not specified", 1111 current_line_number); 1112 status = 0; 1113 } else if (dos_sectors > 63) { 1114 warnx("ERROR line %d: number of sectors must be within (1-63)", 1115 current_line_number); 1116 status = 0; 1117 } 1118 1119 break; 1120 } 1121 return (status); 1122} 1123 1124static u_int32_t 1125str2sectors(const char *str) 1126{ 1127 char *end; 1128 unsigned long val; 1129 1130 val = strtoul(str, &end, 0); 1131 if (str == end || *end == '\0') { 1132 warnx("ERROR line %d: unexpected size: \'%s\'", 1133 current_line_number, str); 1134 return NO_DISK_SECTORS; 1135 } 1136 1137 if (*end == 'K') 1138 val *= 1024UL / secsize; 1139 else if (*end == 'M') 1140 val *= 1024UL * 1024UL / secsize; 1141 else if (*end == 'G') 1142 val *= 1024UL * 1024UL * 1024UL / secsize; 1143 else { 1144 warnx("ERROR line %d: unexpected modifier: %c " 1145 "(not K/M/G)", current_line_number, *end); 1146 return NO_DISK_SECTORS; 1147 } 1148 1149 return val; 1150} 1151 1152static int 1153process_partition(CMD *command) 1154{ 1155 int status = 0, partition; 1156 u_int32_t prev_head_boundary, prev_cyl_boundary; 1157 u_int32_t adj_size, max_end; 1158 struct dos_partition *partp; 1159 1160 while (1) { 1161 part_processed = 1; 1162 if (command->n_args != 4) { 1163 warnx("ERROR line %d: incorrect number of partition args", 1164 current_line_number); 1165 break; 1166 } 1167 partition = command->args[0].arg_val; 1168 if (partition < 1 || partition > 4) { 1169 warnx("ERROR line %d: invalid partition number %d", 1170 current_line_number, partition); 1171 break; 1172 } 1173 partp = &mboot.parts[partition - 1]; 1174 bzero(partp, sizeof (*partp)); 1175 partp->dp_typ = command->args[1].arg_val; 1176 if (command->args[2].arg_str != NULL) { 1177 if (strcmp(command->args[2].arg_str, "*") == 0) { 1178 int i; 1179 partp->dp_start = dos_sectors; 1180 for (i = 1; i < partition; i++) { 1181 struct dos_partition *prev_partp; 1182 prev_partp = ((struct dos_partition *) 1183 &mboot.parts) + i - 1; 1184 if (prev_partp->dp_typ != 0) 1185 partp->dp_start = prev_partp->dp_start + 1186 prev_partp->dp_size; 1187 } 1188 if (partp->dp_start % dos_sectors != 0) { 1189 prev_head_boundary = rounddown(partp->dp_start, 1190 dos_sectors); 1191 partp->dp_start = prev_head_boundary + 1192 dos_sectors; 1193 } 1194 } else { 1195 partp->dp_start = str2sectors(command->args[2].arg_str); 1196 if (partp->dp_start == NO_DISK_SECTORS) 1197 break; 1198 } 1199 } else 1200 partp->dp_start = command->args[2].arg_val; 1201 1202 if (command->args[3].arg_str != NULL) { 1203 if (strcmp(command->args[3].arg_str, "*") == 0) 1204 partp->dp_size = rounddown(disksecs, dos_cylsecs) - 1205 partp->dp_start; 1206 else { 1207 partp->dp_size = str2sectors(command->args[3].arg_str); 1208 if (partp->dp_size == NO_DISK_SECTORS) 1209 break; 1210 } 1211 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size, 1212 dos_cylsecs); 1213 if (prev_cyl_boundary > partp->dp_start) 1214 partp->dp_size = prev_cyl_boundary - partp->dp_start; 1215 } else 1216 partp->dp_size = command->args[3].arg_val; 1217 1218 max_end = partp->dp_start + partp->dp_size; 1219 1220 if (partp->dp_typ == 0) { 1221 /* 1222 * Get out, the partition is marked as unused. 1223 */ 1224 /* 1225 * Insure that it's unused. 1226 */ 1227 bzero(partp, sizeof(*partp)); 1228 status = 1; 1229 break; 1230 } 1231 1232 /* 1233 * Adjust start upwards, if necessary, to fall on a head boundary. 1234 */ 1235 if (partp->dp_start % dos_sectors != 0) { 1236 prev_head_boundary = rounddown(partp->dp_start, dos_sectors); 1237 if (max_end < dos_sectors || 1238 prev_head_boundary > max_end - dos_sectors) { 1239 /* 1240 * Can't go past end of partition 1241 */ 1242 warnx( 1243 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1244 a head boundary", 1245 current_line_number, partition); 1246 break; 1247 } 1248 warnx( 1249 "WARNING: adjusting start offset of partition %d\n\ 1250 from %u to %u, to fall on a head boundary", 1251 partition, (u_int)partp->dp_start, 1252 (u_int)(prev_head_boundary + dos_sectors)); 1253 partp->dp_start = prev_head_boundary + dos_sectors; 1254 } 1255 1256 /* 1257 * Adjust size downwards, if necessary, to fall on a cylinder 1258 * boundary. 1259 */ 1260 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size, 1261 dos_cylsecs); 1262 if (prev_cyl_boundary > partp->dp_start) 1263 adj_size = prev_cyl_boundary - partp->dp_start; 1264 else { 1265 warnx( 1266 "ERROR: could not adjust partition to start on a head boundary\n\ 1267 and end on a cylinder boundary."); 1268 return (0); 1269 } 1270 if (adj_size != partp->dp_size) { 1271 warnx( 1272 "WARNING: adjusting size of partition %d from %u to %u\n\ 1273 to end on a cylinder boundary", 1274 partition, (u_int)partp->dp_size, (u_int)adj_size); 1275 partp->dp_size = adj_size; 1276 } 1277 if (partp->dp_size == 0) { 1278 warnx("ERROR line %d: size of partition %d is zero", 1279 current_line_number, partition); 1280 break; 1281 } 1282 1283 dos(partp); 1284 status = 1; 1285 break; 1286 } 1287 return (status); 1288} 1289 1290 1291static int 1292process_active(CMD *command) 1293{ 1294 int status = 0, partition, i; 1295 struct dos_partition *partp; 1296 1297 while (1) { 1298 active_processed = 1; 1299 if (command->n_args != 1) { 1300 warnx("ERROR line %d: incorrect number of active args", 1301 current_line_number); 1302 status = 0; 1303 break; 1304 } 1305 partition = command->args[0].arg_val; 1306 if (partition < 1 || partition > 4) { 1307 warnx("ERROR line %d: invalid partition number %d", 1308 current_line_number, partition); 1309 break; 1310 } 1311 /* 1312 * Reset active partition 1313 */ 1314 partp = mboot.parts; 1315 for (i = 0; i < NDOSPART; i++) 1316 partp[i].dp_flag = 0; 1317 partp[partition-1].dp_flag = ACTIVE; 1318 1319 status = 1; 1320 break; 1321 } 1322 return (status); 1323} 1324 1325 1326static int 1327process_line(char *line) 1328{ 1329 CMD command; 1330 int status = 1; 1331 1332 while (1) { 1333 parse_config_line(line, &command); 1334 switch (command.cmd) { 1335 case 0: 1336 /* 1337 * Comment or blank line 1338 */ 1339 break; 1340 case 'g': 1341 /* 1342 * Set geometry 1343 */ 1344 status = process_geometry(&command); 1345 break; 1346 case 'p': 1347 status = process_partition(&command); 1348 break; 1349 case 'a': 1350 status = process_active(&command); 1351 break; 1352 default: 1353 status = 0; 1354 break; 1355 } 1356 break; 1357 } 1358 return (status); 1359} 1360 1361 1362static int 1363read_config(char *config_file) 1364{ 1365 FILE *fp = NULL; 1366 int status = 1; 1367 char buf[1010]; 1368 1369 while (1) { 1370 if (strcmp(config_file, "-") != 0) { 1371 /* 1372 * We're not reading from stdin 1373 */ 1374 if ((fp = fopen(config_file, "r")) == NULL) { 1375 status = 0; 1376 break; 1377 } 1378 } else { 1379 fp = stdin; 1380 } 1381 current_line_number = 0; 1382 while (!feof(fp)) { 1383 if (fgets(buf, sizeof(buf), fp) == NULL) 1384 break; 1385 ++current_line_number; 1386 status = process_line(buf); 1387 if (status == 0) 1388 break; 1389 } 1390 break; 1391 } 1392 if (fp) { 1393 /* 1394 * It doesn't matter if we're reading from stdin, as we've reached EOF 1395 */ 1396 fclose(fp); 1397 } 1398 return (status); 1399} 1400 1401 1402static void 1403reset_boot(void) 1404{ 1405 int i; 1406 struct dos_partition *partp; 1407 1408 init_boot(); 1409 for (i = 0; i < 4; ++i) { 1410 partp = &mboot.parts[i]; 1411 bzero(partp, sizeof(*partp)); 1412 } 1413} 1414 1415static int 1416sanitize_partition(struct dos_partition *partp) 1417{ 1418 u_int32_t prev_head_boundary, prev_cyl_boundary; 1419 u_int32_t max_end, size, start; 1420 1421 start = partp->dp_start; 1422 size = partp->dp_size; 1423 max_end = start + size; 1424 /* Only allow a zero size if the partition is being marked unused. */ 1425 if (size == 0) { 1426 if (start == 0 && partp->dp_typ == 0) 1427 return (1); 1428 warnx("ERROR: size of partition is zero"); 1429 return (0); 1430 } 1431 /* Return if no adjustment is necessary. */ 1432 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1433 return (1); 1434 1435 if (start == 0) { 1436 warnx("WARNING: partition overlaps with partition table"); 1437 if (ok("Correct this automatically?")) 1438 start = dos_sectors; 1439 } 1440 if (start % dos_sectors != 0) 1441 warnx("WARNING: partition does not start on a head boundary"); 1442 if ((start +size) % dos_sectors != 0) 1443 warnx("WARNING: partition does not end on a cylinder boundary"); 1444 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1445 if (!ok("Correct this automatically?")) 1446 return (1); 1447 1448 /* 1449 * Adjust start upwards, if necessary, to fall on a head boundary. 1450 */ 1451 if (start % dos_sectors != 0) { 1452 prev_head_boundary = rounddown(start, dos_sectors); 1453 if (max_end < dos_sectors || 1454 prev_head_boundary >= max_end - dos_sectors) { 1455 /* 1456 * Can't go past end of partition 1457 */ 1458 warnx( 1459 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1460 return (0); 1461 } 1462 start = prev_head_boundary + dos_sectors; 1463 } 1464 1465 /* 1466 * Adjust size downwards, if necessary, to fall on a cylinder 1467 * boundary. 1468 */ 1469 prev_cyl_boundary = rounddown(start + size, dos_cylsecs); 1470 if (prev_cyl_boundary > start) 1471 size = prev_cyl_boundary - start; 1472 else { 1473 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1474 and end on a cylinder boundary."); 1475 return (0); 1476 } 1477 1478 /* Finally, commit any changes to partp and return. */ 1479 if (start != partp->dp_start) { 1480 warnx("WARNING: adjusting start offset of partition to %u", 1481 (u_int)start); 1482 partp->dp_start = start; 1483 } 1484 if (size != partp->dp_size) { 1485 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1486 partp->dp_size = size; 1487 } 1488 1489 return (1); 1490} 1491 1492/* 1493 * Try figuring out the root device's canonical disk name. 1494 * The following choices are considered: 1495 * /dev/ad0s1a => /dev/ad0 1496 * /dev/da0a => /dev/da0 1497 * /dev/vinum/root => /dev/vinum/root 1498 * A ".eli" part is removed if it exists (see geli(8)). 1499 * A ".journal" ending is removed if it exists (see gjournal(8)). 1500 */ 1501static char * 1502get_rootdisk(void) 1503{ 1504 struct statfs rootfs; 1505 regex_t re; 1506#define NMATCHES 2 1507 regmatch_t rm[NMATCHES]; 1508 char dev[PATH_MAX], *s; 1509 int rv; 1510 1511 if (statfs("/", &rootfs) == -1) 1512 err(1, "statfs(\"/\")"); 1513 1514 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", 1515 REG_EXTENDED)) != 0) 1516 errx(1, "regcomp() failed (%d)", rv); 1517 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); 1518 if ((s = strstr(dev, ".eli")) != NULL) 1519 memmove(s, s+4, strlen(s + 4) + 1); 1520 1521 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) 1522 errx(1, 1523"mounted root fs resource doesn't match expectations (regexec returned %d)", 1524 rv); 1525 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1526 errx(1, "out of memory"); 1527 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1528 rm[1].rm_eo - rm[1].rm_so); 1529 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1530 1531 return s; 1532} 1533