sbin/bsdlabel/bsdlabel.c

   1 /*
   2  * Copyright (c) 1994, 1995 Gordon W. Ross
   3  * Copyright (c) 1994 Theo de Raadt
   4  * All rights reserved.
   5  * Copyright (c) 1987, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Symmetric Computer Systems.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  *      This product includes software developed by Theo de Raadt.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      from: $NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk $
  41  */
  42
  43 #if 0
  44 #ifndef lint
  45 static const char copyright[] =
  46 "@(#) Copyright (c) 1987, 1993\n\
  47         The Regents of the University of California.  All rights reserved.\n";
  48 #endif /* not lint */
  49
  50 #ifndef lint
  51 static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 1/7/94";
  52 /* from static char sccsid[] = "@(#)disklabel.c 1.2 (Symmetric) 11/28/85"; */
  53 #endif /* not lint */
  54 #endif
  55 #include <sys/cdefs.h>
  56 __FBSDID("$FreeBSD$");
  57
  58 #include <sys/param.h>
  59 #include <stdint.h>
  60 #include <sys/file.h>
  61 #include <sys/stat.h>
  62 #include <sys/wait.h>
  63 #include <sys/disk.h>
  64 #define DKTYPENAMES
  65 #define FSTYPENAMES
  66 #define MAXPARTITIONS   26
  67 #include <sys/disklabel.h>
  68
  69 #include <unistd.h>
  70 #include <string.h>
  71 #include <stdio.h>
  72 #include <libgeom.h>
  73 #include <stdlib.h>
  74 #include <signal.h>
  75 #include <stdarg.h>
  76 #include <ctype.h>
  77 #include <err.h>
  78 #include <errno.h>
  79
  80 #include "pathnames.h"
  81
  82 static void     makelabel(const char *, struct disklabel *);
  83 static int      writelabel(void);
  84 static int      readlabel(int flag);
  85 static void     display(FILE *, const struct disklabel *);
  86 static int      edit(void);
  87 static int      editit(void);
  88 static void     fixlabel(struct disklabel *);
  89 static char     *skip(char *);
  90 static char     *word(char *);
  91 static int      getasciilabel(FILE *, struct disklabel *);
  92 static int      getasciipartspec(char *, struct disklabel *, int, int);
  93 static int      checklabel(struct disklabel *);
  94 static void     usage(void);
  95 static struct disklabel *getvirginlabel(void);
  96
  97 #define DEFEDITOR       _PATH_VI
  98 #define DEFPARTITIONS   8
  99
 100 static char     *specname;
 101 static char     *pname;
 102 static char     tmpfil[] = PATH_TMPFILE;
 103
 104 static struct   disklabel lab;
 105 static u_char   bootarea[BBSIZE];
 106 static off_t    mediasize;
 107 static u_int    secsize;
 108 static char     blank[] = "";
 109 static char     unknown[] = "unknown";
 110
 111 #define MAX_PART ('z')
 112 #define MAX_NUM_PARTS (1 + MAX_PART - 'a')
 113 static char    part_size_type[MAX_NUM_PARTS];
 114 static char    part_offset_type[MAX_NUM_PARTS];
 115 static int     part_set[MAX_NUM_PARTS];
 116
 117 static int      installboot;    /* non-zero if we should install a boot program */
 118 static int      allfields;      /* present all fields in edit */
 119 static char const *xxboot;      /* primary boot */
 120
 121 static uint32_t lba_offset;
 122 #ifndef LABELSECTOR
 123 #define LABELSECTOR -1
 124 #endif
 125 #ifndef LABELOFFSET
 126 #define LABELOFFSET -1
 127 #endif
 128 static int labelsoffset = LABELSECTOR;
 129 static int labeloffset = LABELOFFSET;
 130 static int bbsize = BBSIZE;
 131 static int alphacksum =
 132 #if defined(__alpha__)
 133         1;
 134 #else
 135         0;
 136 #endif
 137
 138 enum    {
 139         UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
 140 } op = UNSPEC;
 141
 142
 143 static int      disable_write;   /* set to disable writing to disk label */
 144 static int      is_file;        /* work on a file (abs. pathname), "-f" opt. */
 145
 146 int
 147 main(int argc, char *argv[])
 148 {
 149         FILE *t;
 150         int ch, error, fd;
 151         const char *name;
 152
 153         error = 0;
 154         name = NULL;
 155
 156         while ((ch = getopt(argc, argv, "ABb:efm:nRrw")) != -1)
 157                 switch (ch) {
 158                         case 'A':
 159                                 allfields = 1;
 160                                 break;
 161                         case 'B':
 162                                 ++installboot;
 163                                 break;
 164                         case 'b':
 165                                 xxboot = optarg;
 166                                 break;
 167                         case 'f':
 168                                 is_file=1;
 169                                 break;
 170                         case 'm':
 171                                 if (!strcmp(optarg, "i386") ||
 172                                     !strcmp(optarg, "amd64") ||
 173                                     !strcmp(optarg, "ia64") ||
 174                                     !strcmp(optarg, "pc98")) {
 175                                         labelsoffset = 1;
 176                                         labeloffset = 0;
 177                                         bbsize = 8192;
 178                                         alphacksum = 0;
 179                                 } else if (!strcmp(optarg, "alpha")) {
 180                                         labelsoffset = 0;
 181                                         labeloffset = 64;
 182                                         bbsize = 8192;
 183                                         alphacksum = 1;
 184                                 } else {
 185                                         errx(1, "Unsupported architecture");
 186                                 }
 187                                 break;
 188                         case 'n':
 189                                 disable_write = 1;
 190                                 break;
 191                         case 'R':
 192                                 if (op != UNSPEC)
 193                                         usage();
 194                                 op = RESTORE;
 195                                 break;
 196                         case 'e':
 197                                 if (op != UNSPEC)
 198                                         usage();
 199                                 op = EDIT;
 200                                 break;
 201                         case 'r':
 202                                 /*
 203                                  * We accept and ignode -r for compatibility with
 204                                  * historically disklabel usage.
 205                                  */
 206                                 break;
 207                         case 'w':
 208                                 if (op != UNSPEC)
 209                                         usage();
 210                                 op = WRITE;
 211                                 break;
 212                         case '?':
 213                         default:
 214                                 usage();
 215                 }
 216         argc -= optind;
 217         argv += optind;
 218
 219         if (argc < 1)
 220                 usage();
 221         if (labelsoffset < 0 || labeloffset < 0)
 222                 errx(1, "a -m <architecture> option must be specified");
 223
 224         /* Figure out the names of the thing we're working on */
 225         if (is_file) {
 226                 specname = argv[0];
 227         } else {
 228                 specname = g_device_path(argv[0]);
 229                 if (specname == NULL) {
 230                         warn("unable to get correct path for %s", argv[0]);
 231                         return(1);
 232                 }
 233                 fd = open(specname, O_RDONLY);
 234                 if (fd < 0) {
 235                         warn("error opening %s", specname);
 236                         return(1);
 237                 }
 238                 pname = g_providername(fd);
 239                 if (pname == NULL) {
 240                         warn("error getting providername for %s", specname);
 241                         close(fd);
 242                         return(1);
 243                 }
 244                 close(fd);
 245         }
 246
 247         if (installboot && op == UNSPEC)
 248                 op = WRITEBOOT;
 249         else if (op == UNSPEC)
 250                 op = READ;
 251
 252         switch(op) {
 253
 254         case UNSPEC:
 255                 break;
 256
 257         case EDIT:
 258                 if (argc != 1)
 259                         usage();
 260                 readlabel(1);
 261                 fixlabel(&lab);
 262                 error = edit();
 263                 break;
 264
 265         case READ:
 266                 if (argc != 1)
 267                         usage();
 268                 readlabel(1);
 269                 display(stdout, NULL);
 270                 error = checklabel(NULL);
 271                 break;
 272
 273         case RESTORE:
 274                 if (argc != 2)
 275                         usage();
 276                 if (!(t = fopen(argv[1], "r")))
 277                         err(4, "fopen %s", argv[1]);
 278                 readlabel(0);
 279                 if (!getasciilabel(t, &lab))
 280                         exit(1);
 281                 error = writelabel();
 282                 break;
 283
 284         case WRITE:
 285                 if (argc == 2)
 286                         name = argv[1];
 287                 else if (argc == 1)
 288                         name = "auto";
 289                 else
 290                         usage();
 291                 readlabel(0);
 292                 makelabel(name, &lab);
 293                 fixlabel(&lab);
 294                 if (checklabel(NULL) == 0)
 295                         error = writelabel();
 296                 break;
 297
 298         case WRITEBOOT:
 299
 300                 readlabel(1);
 301                 fixlabel(&lab);
 302                 if (argc == 2)
 303                         makelabel(argv[1], &lab);
 304                 if (checklabel(NULL) == 0)
 305                         error = writelabel();
 306                 break;
 307         }
 308         exit(error);
 309 }
 310
 311 static void
 312 fixlabel(struct disklabel *lp)
 313 {
 314         struct partition *dp;
 315         int i;
 316
 317         for (i = 0; i < lp->d_npartitions; i++) {
 318                 if (i == RAW_PART)
 319                         continue;
 320                 if (lp->d_partitions[i].p_size)
 321                         return;
 322         }
 323
 324         dp = &lp->d_partitions[0];
 325         dp->p_offset = BBSIZE / secsize;
 326         dp->p_size = lp->d_secperunit - dp->p_offset;
 327 }
 328
 329 /*
 330  * Construct a prototype disklabel from /etc/disktab.
 331  */
 332 static void
 333 makelabel(const char *type, struct disklabel *lp)
 334 {
 335         struct disklabel *dp;
 336
 337         if (strcmp(type, "auto") == 0)
 338                 dp = getvirginlabel();
 339         else
 340                 dp = getdiskbyname(type);
 341         if (dp == NULL)
 342                 errx(1, "%s: unknown disk type", type);
 343         *lp = *dp;
 344         bzero(lp->d_packname, sizeof(lp->d_packname));
 345 }
 346
 347 static void
 348 readboot(void)
 349 {
 350         int fd, i;
 351         struct stat st;
 352         uint64_t *p;
 353
 354         if (xxboot == NULL)
 355                 xxboot = "/boot/boot";
 356         fd = open(xxboot, O_RDONLY);
 357         if (fd < 0)
 358                 err(1, "cannot open %s", xxboot);
 359         fstat(fd, &st);
 360         if (alphacksum && st.st_size <= BBSIZE - 512) {
 361                 i = read(fd, bootarea + 512, st.st_size);
 362                 if (i != st.st_size)
 363                         err(1, "read error %s", xxboot);
 364
 365                 /*
 366                  * Set the location and length so SRM can find the
 367                  * boot blocks.
 368                  */
 369                 p = (uint64_t *)bootarea;
 370                 p[60] = (st.st_size + secsize - 1) / secsize;
 371                 p[61] = 1;
 372                 p[62] = 0;
 373                 return;
 374         } else if ((!alphacksum) && st.st_size <= BBSIZE) {
 375                 i = read(fd, bootarea, st.st_size);
 376                 if (i != st.st_size)
 377                         err(1, "read error %s", xxboot);
 378                 return;
 379         }
 380         errx(1, "boot code %s is wrong size", xxboot);
 381 }
 382
 383 static int
 384 writelabel(void)
 385 {
 386         uint64_t *p, sum;
 387         int i, fd;
 388         struct gctl_req *grq;
 389         char const *errstr;
 390         struct disklabel *lp = &lab;
 391
 392         if (disable_write) {
 393                 warnx("write to disk label supressed - label was as follows:");
 394                 display(stdout, NULL);
 395                 return (0);
 396         }
 397
 398         lp->d_magic = DISKMAGIC;
 399         lp->d_magic2 = DISKMAGIC;
 400         lp->d_checksum = 0;
 401         lp->d_checksum = dkcksum(lp);
 402         if (installboot)
 403                 readboot();
 404         for (i = 0; i < lab.d_npartitions; i++)
 405                 if (lab.d_partitions[i].p_size)
 406                         lab.d_partitions[i].p_offset += lba_offset;
 407         bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * secsize,
 408             lp);
 409         if (alphacksum) {
 410                 /* Generate the bootblock checksum for the SRM console.  */
 411                 for (p = (uint64_t *)bootarea, i = 0, sum = 0; i < 63; i++)
 412                         sum += p[i];
 413                 p[63] = sum;
 414         }
 415
 416         fd = open(specname, O_RDWR);
 417         if (fd < 0) {
 418                 if (is_file) {
 419                         warn("cannot open file %s for writing label", specname);
 420                         return(1);
 421                 }
 422
 423                 grq = gctl_get_handle();
 424                 gctl_ro_param(grq, "verb", -1, "write label");
 425                 gctl_ro_param(grq, "class", -1, "BSD");
 426                 gctl_ro_param(grq, "geom", -1, pname);
 427                 gctl_ro_param(grq, "label", 148+16*8,
 428                         bootarea + labeloffset + labelsoffset * secsize);
 429                 errstr = gctl_issue(grq);
 430                 if (errstr != NULL) {
 431                         warnx("%s", errstr);
 432                         gctl_free(grq);
 433                         return(1);
 434                 }
 435                 gctl_free(grq);
 436                 if (installboot) {
 437                         grq = gctl_get_handle();
 438                         gctl_ro_param(grq, "verb", -1, "write bootcode");
 439                         gctl_ro_param(grq, "class", -1, "BSD");
 440                         gctl_ro_param(grq, "geom", -1, pname);
 441                         gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
 442                         errstr = gctl_issue(grq);
 443                         if (errstr != NULL) {
 444                                 warnx("%s", errstr);
 445                                 gctl_free(grq);
 446                                 return (1);
 447                         }
 448                         gctl_free(grq);
 449                 }
 450         } else {
 451                 if (write(fd, bootarea, bbsize) != bbsize) {
 452                         warn("write %s", specname);
 453                         close (fd);
 454                         return (1);
 455                 }
 456                 close (fd);
 457         }
 458         return (0);
 459 }
 460
 461 static void
 462 get_file_parms(int f)
 463 {
 464         int i;
 465         struct stat sb;
 466
 467         if (fstat(f, &sb) != 0)
 468                 err(4, "fstat failed");
 469         i = sb.st_mode & S_IFMT;
 470         if (i != S_IFREG && i != S_IFLNK)
 471                 errx(4, "%s is not a valid file or link", specname);
 472         secsize = DEV_BSIZE;
 473         mediasize = sb.st_size;
 474 }
 475
 476 /*
 477  * Fetch disklabel for disk.
 478  */
 479 static int
 480 readlabel(int flag)
 481 {
 482         uint32_t lba;
 483         int f, i;
 484         int error;
 485
 486         f = open(specname, O_RDONLY);
 487         if (f < 0)
 488                 err(1, specname);
 489         if (is_file)
 490                 get_file_parms(f);
 491         else {
 492                 mediasize = g_mediasize(f);
 493                 secsize = g_sectorsize(f);
 494                 if (secsize < 0 || mediasize < 0)
 495                         err(4, "cannot get disk geometry");
 496         }
 497         if (mediasize > (off_t)0xffffffff * secsize)
 498                 errx(1,
 499                     "disks with more than 2^32-1 sectors are not supported");
 500         (void)lseek(f, (off_t)0, SEEK_SET);
 501         if (read(f, bootarea, BBSIZE) != BBSIZE)
 502                 err(4, "%s read", specname);
 503         close (f);
 504         error = bsd_disklabel_le_dec(
 505             bootarea + (labeloffset + labelsoffset * secsize),
 506             &lab, MAXPARTITIONS);
 507         if (flag && error)
 508                 errx(1, "%s: no valid label found", specname);
 509
 510         if (is_file)
 511                 return(0);
 512
 513         /*
 514          * Compensate for absolute block addressing by finding the
 515          * smallest partition offset and if the offset of the 'c'
 516          * partition is equal to that, subtract it from all offsets.
 517          */
 518         lba = ~0;
 519         for (i = 0; i < lab.d_npartitions; i++) {
 520                 if (lab.d_partitions[i].p_size)
 521                         lba = MIN(lba, lab.d_partitions[i].p_offset);
 522         }
 523         if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
 524                 for (i = 0; i < lab.d_npartitions; i++) {
 525                         if (lab.d_partitions[i].p_size)
 526                                 lab.d_partitions[i].p_offset -= lba;
 527                 }
 528                 /*
 529                  * Save the offset so that we can write the label
 530                  * back with absolute block addresses.
 531                  */
 532                 lba_offset = lba;
 533         }
 534         return (error);
 535 }
 536
 537
 538 static void
 539 display(FILE *f, const struct disklabel *lp)
 540 {
 541         int i, j;
 542         const struct partition *pp;
 543
 544         if (lp == NULL)
 545                 lp = &lab;
 546
 547         fprintf(f, "# %s:\n", specname);
 548         if (allfields) {
 549                 if (lp->d_type < DKMAXTYPES)
 550                         fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
 551                 else
 552                         fprintf(f, "type: %u\n", lp->d_type);
 553                 fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
 554                         lp->d_typename);
 555                 fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
 556                         lp->d_packname);
 557                 fprintf(f, "flags:");
 558                 if (lp->d_flags & D_REMOVABLE)
 559                         fprintf(f, " removeable");
 560                 if (lp->d_flags & D_ECC)
 561                         fprintf(f, " ecc");
 562                 if (lp->d_flags & D_BADSECT)
 563                         fprintf(f, " badsect");
 564                 fprintf(f, "\n");
 565                 fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
 566                 fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
 567                 fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
 568                 fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
 569                 fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
 570                 fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
 571                 fprintf(f, "rpm: %u\n", lp->d_rpm);
 572                 fprintf(f, "interleave: %u\n", lp->d_interleave);
 573                 fprintf(f, "trackskew: %u\n", lp->d_trackskew);
 574                 fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
 575                 fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
 576                     (u_long)lp->d_headswitch);
 577                 fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
 578                     (u_long)lp->d_trkseek);
 579                 fprintf(f, "drivedata: ");
 580                 for (i = NDDATA - 1; i >= 0; i--)
 581                         if (lp->d_drivedata[i])
 582                                 break;
 583                 if (i < 0)
 584                         i = 0;
 585                 for (j = 0; j <= i; j++)
 586                         fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
 587                 fprintf(f, "\n\n");
 588         }
 589         fprintf(f, "%u partitions:\n", lp->d_npartitions);
 590         fprintf(f,
 591             "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
 592         pp = lp->d_partitions;
 593         for (i = 0; i < lp->d_npartitions; i++, pp++) {
 594                 if (pp->p_size) {
 595                         fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
 596                            (u_long)pp->p_size, (u_long)pp->p_offset);
 597                         if (pp->p_fstype < FSMAXTYPES)
 598                                 fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
 599                         else
 600                                 fprintf(f, "%8d", pp->p_fstype);
 601                         switch (pp->p_fstype) {
 602
 603                         case FS_UNUSED:                         /* XXX */
 604                                 fprintf(f, "    %5lu %5lu %5.5s ",
 605                                     (u_long)pp->p_fsize,
 606                                     (u_long)(pp->p_fsize * pp->p_frag), "");
 607                                 break;
 608
 609                         case FS_BSDFFS:
 610                                 fprintf(f, "    %5lu %5lu %5u ",
 611                                     (u_long)pp->p_fsize,
 612                                     (u_long)(pp->p_fsize * pp->p_frag),
 613                                     pp->p_cpg);
 614                                 break;
 615
 616                         case FS_BSDLFS:
 617                                 fprintf(f, "    %5lu %5lu %5d",
 618                                     (u_long)pp->p_fsize,
 619                                     (u_long)(pp->p_fsize * pp->p_frag),
 620                                     pp->p_cpg);
 621                                 break;
 622
 623                         default:
 624                                 fprintf(f, "%20.20s", "");
 625                                 break;
 626                         }
 627                         if (i == RAW_PART) {
 628                                 fprintf(f, "  # \"raw\" part, don't edit");
 629                         }
 630                         fprintf(f, "\n");
 631                 }
 632         }
 633         fflush(f);
 634 }
 635
 636 static int
 637 edit(void)
 638 {
 639         int c, fd;
 640         struct disklabel label;
 641         FILE *fp;
 642
 643         if ((fd = mkstemp(tmpfil)) == -1 ||
 644             (fp = fdopen(fd, "w")) == NULL) {
 645                 warnx("can't create %s", tmpfil);
 646                 return (1);
 647         }
 648         display(fp, NULL);
 649         fclose(fp);
 650         for (;;) {
 651                 if (!editit())
 652                         break;
 653                 fp = fopen(tmpfil, "r");
 654                 if (fp == NULL) {
 655                         warnx("can't reopen %s for reading", tmpfil);
 656                         break;
 657                 }
 658                 bzero((char *)&label, sizeof(label));
 659                 c = getasciilabel(fp, &label);
 660                 fclose(fp);
 661                 if (c) {
 662                         lab = label;
 663                         if (writelabel() == 0) {
 664                                 (void) unlink(tmpfil);
 665                                 return (0);
 666                         }
 667                 }
 668                 printf("re-edit the label? [y]: ");
 669                 fflush(stdout);
 670                 c = getchar();
 671                 if (c != EOF && c != (int)'\n')
 672                         while (getchar() != (int)'\n')
 673                                 ;
 674                 if  (c == (int)'n')
 675                         break;
 676         }
 677         (void) unlink(tmpfil);
 678         return (1);
 679 }
 680
 681 static int
 682 editit(void)
 683 {
 684         int pid, xpid;
 685         int locstat, omask;
 686         const char *ed;
 687
 688         omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 689         while ((pid = fork()) < 0) {
 690                 if (errno == EPROCLIM) {
 691                         warnx("you have too many processes");
 692                         return(0);
 693                 }
 694                 if (errno != EAGAIN) {
 695                         warn("fork");
 696                         return(0);
 697                 }
 698                 sleep(1);
 699         }
 700         if (pid == 0) {
 701                 sigsetmask(omask);
 702                 setgid(getgid());
 703                 setuid(getuid());
 704                 if ((ed = getenv("EDITOR")) == (char *)0)
 705                         ed = DEFEDITOR;
 706                 execlp(ed, ed, tmpfil, (char *)0);
 707                 err(1, "%s", ed);
 708         }
 709         while ((xpid = wait(&locstat)) >= 0)
 710                 if (xpid == pid)
 711                         break;
 712         sigsetmask(omask);
 713         return(!locstat);
 714 }
 715
 716 static char *
 717 skip(char *cp)
 718 {
 719
 720         while (*cp != '\0' && isspace(*cp))
 721                 cp++;
 722         if (*cp == '\0' || *cp == '#')
 723                 return (NULL);
 724         return (cp);
 725 }
 726
 727 static char *
 728 word(char *cp)
 729 {
 730         char c;
 731
 732         while (*cp != '\0' && !isspace(*cp) && *cp != '#')
 733                 cp++;
 734         if ((c = *cp) != '\0') {
 735                 *cp++ = '\0';
 736                 if (c != '#')
 737                         return (skip(cp));
 738         }
 739         return (NULL);
 740 }
 741
 742 /*
 743  * Read an ascii label in from fd f,
 744  * in the same format as that put out by display(),
 745  * and fill in lp.
 746  */
 747 static int
 748 getasciilabel(FILE *f, struct disklabel *lp)
 749 {
 750         char *cp;
 751         const char **cpp;
 752         u_int part;
 753         char *tp, line[BUFSIZ];
 754         u_long v;
 755         int lineno = 0, errors = 0;
 756         int i;
 757
 758         makelabel("auto", lp);
 759         bzero(&part_set, sizeof(part_set));
 760         bzero(&part_size_type, sizeof(part_size_type));
 761         bzero(&part_offset_type, sizeof(part_offset_type));
 762         lp->d_bbsize = BBSIZE;                          /* XXX */
 763         lp->d_sbsize = 0;                               /* XXX */
 764         while (fgets(line, sizeof(line) - 1, f)) {
 765                 lineno++;
 766                 if ((cp = index(line,'\n')) != 0)
 767                         *cp = '\0';
 768                 cp = skip(line);
 769                 if (cp == NULL)
 770                         continue;
 771                 tp = index(cp, ':');
 772                 if (tp == NULL) {
 773                         fprintf(stderr, "line %d: syntax error\n", lineno);
 774                         errors++;
 775                         continue;
 776                 }
 777                 *tp++ = '\0', tp = skip(tp);
 778                 if (!strcmp(cp, "type")) {
 779                         if (tp == NULL)
 780                                 tp = unknown;
 781                         cpp = dktypenames;
 782                         for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
 783                                 if (*cpp && !strcmp(*cpp, tp)) {
 784                                         lp->d_type = cpp - dktypenames;
 785                                         break;
 786                                 }
 787                         if (cpp < &dktypenames[DKMAXTYPES])
 788                                 continue;
 789                         v = strtoul(tp, NULL, 10);
 790                         if (v >= DKMAXTYPES)
 791                                 fprintf(stderr, "line %d:%s %lu\n", lineno,
 792                                     "Warning, unknown disk type", v);
 793                         lp->d_type = v;
 794                         continue;
 795                 }
 796                 if (!strcmp(cp, "flags")) {
 797                         for (v = 0; (cp = tp) && *cp != '\0';) {
 798                                 tp = word(cp);
 799                                 if (!strcmp(cp, "removeable"))
 800                                         v |= D_REMOVABLE;
 801                                 else if (!strcmp(cp, "ecc"))
 802                                         v |= D_ECC;
 803                                 else if (!strcmp(cp, "badsect"))
 804                                         v |= D_BADSECT;
 805                                 else {
 806                                         fprintf(stderr,
 807                                             "line %d: %s: bad flag\n",
 808                                             lineno, cp);
 809                                         errors++;
 810                                 }
 811                         }
 812                         lp->d_flags = v;
 813                         continue;
 814                 }
 815                 if (!strcmp(cp, "drivedata")) {
 816                         for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
 817                                 lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
 818                                 tp = word(cp);
 819                         }
 820                         continue;
 821                 }
 822                 if (sscanf(cp, "%lu partitions", &v) == 1) {
 823                         if (v == 0 || v > MAXPARTITIONS) {
 824                                 fprintf(stderr,
 825                                     "line %d: bad # of partitions\n", lineno);
 826                                 lp->d_npartitions = MAXPARTITIONS;
 827                                 errors++;
 828                         } else
 829                                 lp->d_npartitions = v;
 830                         continue;
 831                 }
 832                 if (tp == NULL)
 833                         tp = blank;
 834                 if (!strcmp(cp, "disk")) {
 835                         strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
 836                         continue;
 837                 }
 838                 if (!strcmp(cp, "label")) {
 839                         strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
 840                         continue;
 841                 }
 842                 if (!strcmp(cp, "bytes/sector")) {
 843                         v = strtoul(tp, NULL, 10);
 844                         if (v == 0 || (v % DEV_BSIZE) != 0) {
 845                                 fprintf(stderr,
 846                                     "line %d: %s: bad sector size\n",
 847                                     lineno, tp);
 848                                 errors++;
 849                         } else
 850                                 lp->d_secsize = v;
 851                         continue;
 852                 }
 853                 if (!strcmp(cp, "sectors/track")) {
 854                         v = strtoul(tp, NULL, 10);
 855 #if (ULONG_MAX != 0xffffffffUL)
 856                         if (v == 0 || v > 0xffffffff)
 857 #else
 858                         if (v == 0)
 859 #endif
 860                         {
 861                                 fprintf(stderr, "line %d: %s: bad %s\n",
 862                                     lineno, tp, cp);
 863                                 errors++;
 864                         } else
 865                                 lp->d_nsectors = v;
 866                         continue;
 867                 }
 868                 if (!strcmp(cp, "sectors/cylinder")) {
 869                         v = strtoul(tp, NULL, 10);
 870                         if (v == 0) {
 871                                 fprintf(stderr, "line %d: %s: bad %s\n",
 872                                     lineno, tp, cp);
 873                                 errors++;
 874                         } else
 875                                 lp->d_secpercyl = v;
 876                         continue;
 877                 }
 878                 if (!strcmp(cp, "tracks/cylinder")) {
 879                         v = strtoul(tp, NULL, 10);
 880                         if (v == 0) {
 881                                 fprintf(stderr, "line %d: %s: bad %s\n",
 882                                     lineno, tp, cp);
 883                                 errors++;
 884                         } else
 885                                 lp->d_ntracks = v;
 886                         continue;
 887                 }
 888                 if (!strcmp(cp, "cylinders")) {
 889                         v = strtoul(tp, NULL, 10);
 890                         if (v == 0) {
 891                                 fprintf(stderr, "line %d: %s: bad %s\n",
 892                                     lineno, tp, cp);
 893                                 errors++;
 894                         } else
 895                                 lp->d_ncylinders = v;
 896                         continue;
 897                 }
 898                 if (!strcmp(cp, "sectors/unit")) {
 899                         v = strtoul(tp, NULL, 10);
 900                         if (v == 0) {
 901                                 fprintf(stderr, "line %d: %s: bad %s\n",
 902                                     lineno, tp, cp);
 903                                 errors++;
 904                         } else
 905                                 lp->d_secperunit = v;
 906                         continue;
 907                 }
 908                 if (!strcmp(cp, "rpm")) {
 909                         v = strtoul(tp, NULL, 10);
 910                         if (v == 0 || v > USHRT_MAX) {
 911                                 fprintf(stderr, "line %d: %s: bad %s\n",
 912                                     lineno, tp, cp);
 913                                 errors++;
 914                         } else
 915                                 lp->d_rpm = v;
 916                         continue;
 917                 }
 918                 if (!strcmp(cp, "interleave")) {
 919                         v = strtoul(tp, NULL, 10);
 920                         if (v == 0 || v > USHRT_MAX) {
 921                                 fprintf(stderr, "line %d: %s: bad %s\n",
 922                                     lineno, tp, cp);
 923                                 errors++;
 924                         } else
 925                                 lp->d_interleave = v;
 926                         continue;
 927                 }
 928                 if (!strcmp(cp, "trackskew")) {
 929                         v = strtoul(tp, NULL, 10);
 930                         if (v > USHRT_MAX) {
 931                                 fprintf(stderr, "line %d: %s: bad %s\n",
 932                                     lineno, tp, cp);
 933                                 errors++;
 934                         } else
 935                                 lp->d_trackskew = v;
 936                         continue;
 937                 }
 938                 if (!strcmp(cp, "cylinderskew")) {
 939                         v = strtoul(tp, NULL, 10);
 940                         if (v > USHRT_MAX) {
 941                                 fprintf(stderr, "line %d: %s: bad %s\n",
 942                                     lineno, tp, cp);
 943                                 errors++;
 944                         } else
 945                                 lp->d_cylskew = v;
 946                         continue;
 947                 }
 948                 if (!strcmp(cp, "headswitch")) {
 949                         v = strtoul(tp, NULL, 10);
 950                         lp->d_headswitch = v;
 951                         continue;
 952                 }
 953                 if (!strcmp(cp, "track-to-track seek")) {
 954                         v = strtoul(tp, NULL, 10);
 955                         lp->d_trkseek = v;
 956                         continue;
 957                 }
 958                 /* the ':' was removed above */
 959                 if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
 960                         fprintf(stderr,
 961                             "line %d: %s: Unknown disklabel field\n", lineno,
 962                             cp);
 963                         errors++;
 964                         continue;
 965                 }
 966
 967                 /* Process a partition specification line. */
 968                 part = *cp - 'a';
 969                 if (part >= lp->d_npartitions) {
 970                         fprintf(stderr,
 971                             "line %d: partition name out of range a-%c: %s\n",
 972                             lineno, 'a' + lp->d_npartitions - 1, cp);
 973                         errors++;
 974                         continue;
 975                 }
 976                 part_set[part] = 1;
 977
 978                 if (getasciipartspec(tp, lp, part, lineno) != 0) {
 979                         errors++;
 980                         break;
 981                 }
 982         }
 983         errors += checklabel(lp);
 984         return (errors == 0);
 985 }
 986
 987 #define NXTNUM(n) do { \
 988         if (tp == NULL) { \
 989                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
 990                 return (1); \
 991         } else { \
 992                 cp = tp, tp = word(cp); \
 993                 (n) = strtoul(cp, NULL, 10); \
 994         } \
 995 } while (0)
 996
 997 /* retain 1 character following number */
 998 #define NXTWORD(w,n) do { \
 999         if (tp == NULL) { \
1000                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1001                 return (1); \
1002         } else { \
1003                 char *tmp; \
1004                 cp = tp, tp = word(cp); \
1005                 (n) = strtoul(cp, &tmp, 10); \
1006                 if (tmp) (w) = *tmp; \
1007         } \
1008 } while (0)
1009
1010 /*
1011  * Read a partition line into partition `part' in the specified disklabel.
1012  * Return 0 on success, 1 on failure.
1013  */
1014 static int
1015 getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1016 {
1017         struct partition *pp;
1018         char *cp;
1019         const char **cpp;
1020         u_long v;
1021
1022         pp = &lp->d_partitions[part];
1023         cp = NULL;
1024
1025         v = 0;
1026         NXTWORD(part_size_type[part],v);
1027         if (v == 0 && part_size_type[part] != '*') {
1028                 fprintf(stderr,
1029                     "line %d: %s: bad partition size\n", lineno, cp);
1030                 return (1);
1031         }
1032         pp->p_size = v;
1033
1034         v = 0;
1035         NXTWORD(part_offset_type[part],v);
1036         if (v == 0 && part_offset_type[part] != '*' &&
1037             part_offset_type[part] != '\0') {
1038                 fprintf(stderr,
1039                     "line %d: %s: bad partition offset\n", lineno, cp);
1040                 return (1);
1041         }
1042         pp->p_offset = v;
1043         if (tp == NULL) {
1044                 fprintf(stderr, "line %d: missing file system type\n", lineno);
1045                 return (1);
1046         }
1047         cp = tp, tp = word(cp);
1048         for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1049                 if (*cpp && !strcmp(*cpp, cp))
1050                         break;
1051         if (*cpp != NULL) {
1052                 pp->p_fstype = cpp - fstypenames;
1053         } else {
1054                 if (isdigit(*cp))
1055                         v = strtoul(cp, NULL, 10);
1056                 else
1057                         v = FSMAXTYPES;
1058                 if (v >= FSMAXTYPES) {
1059                         fprintf(stderr,
1060                             "line %d: Warning, unknown file system type %s\n",
1061                             lineno, cp);
1062                         v = FS_UNUSED;
1063                 }
1064                 pp->p_fstype = v;
1065         }
1066
1067         switch (pp->p_fstype) {
1068         case FS_UNUSED:
1069         case FS_BSDFFS:
1070         case FS_BSDLFS:
1071                 /* accept defaults for fsize/frag/cpg */
1072                 if (tp) {
1073                         NXTNUM(pp->p_fsize);
1074                         if (pp->p_fsize == 0)
1075                                 break;
1076                         NXTNUM(v);
1077                         pp->p_frag = v / pp->p_fsize;
1078                         if (tp != NULL)
1079                                 NXTNUM(pp->p_cpg);
1080                 }
1081                 /* else default to 0's */
1082                 break;
1083         default:
1084                 break;
1085         }
1086         return (0);
1087 }
1088
1089 /*
1090  * Check disklabel for errors and fill in
1091  * derived fields according to supplied values.
1092  */
1093 static int
1094 checklabel(struct disklabel *lp)
1095 {
1096         struct partition *pp;
1097         int i, errors = 0;
1098         char part;
1099         u_long base_offset, needed, total_size, total_percent, current_offset;
1100         long free_space;
1101         int seen_default_offset;
1102         int hog_part;
1103         int j;
1104         struct partition *pp2;
1105
1106         if (lp == NULL)
1107                 lp = &lab;
1108
1109         if (allfields) {
1110
1111                 if (lp->d_secsize == 0) {
1112                         fprintf(stderr, "sector size 0\n");
1113                         return (1);
1114                 }
1115                 if (lp->d_nsectors == 0) {
1116                         fprintf(stderr, "sectors/track 0\n");
1117                         return (1);
1118                 }
1119                 if (lp->d_ntracks == 0) {
1120                         fprintf(stderr, "tracks/cylinder 0\n");
1121                         return (1);
1122                 }
1123                 if  (lp->d_ncylinders == 0) {
1124                         fprintf(stderr, "cylinders/unit 0\n");
1125                         errors++;
1126                 }
1127                 if (lp->d_rpm == 0)
1128                         warnx("revolutions/minute 0");
1129                 if (lp->d_secpercyl == 0)
1130                         lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1131                 if (lp->d_secperunit == 0)
1132                         lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1133                 if (lp->d_bbsize == 0) {
1134                         fprintf(stderr, "boot block size 0\n");
1135                         errors++;
1136                 } else if (lp->d_bbsize % lp->d_secsize)
1137                         warnx("boot block size %% sector-size != 0");
1138                 if (lp->d_npartitions > MAXPARTITIONS)
1139                         warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1140                             (u_long)lp->d_npartitions, MAXPARTITIONS);
1141         } else {
1142                 struct disklabel *vl;
1143
1144                 vl = getvirginlabel();
1145                 lp->d_secsize = vl->d_secsize;
1146                 lp->d_nsectors = vl->d_nsectors;
1147                 lp->d_ntracks = vl->d_ntracks;
1148                 lp->d_ncylinders = vl->d_ncylinders;
1149                 lp->d_rpm = vl->d_rpm;
1150                 lp->d_interleave = vl->d_interleave;
1151                 lp->d_secpercyl = vl->d_secpercyl;
1152                 lp->d_secperunit = vl->d_secperunit;
1153                 lp->d_bbsize = vl->d_bbsize;
1154                 lp->d_npartitions = vl->d_npartitions;
1155         }
1156
1157
1158         /* first allocate space to the partitions, then offsets */
1159         total_size = 0; /* in sectors */
1160         total_percent = 0; /* in percent */
1161         hog_part = -1;
1162         /* find all fixed partitions */
1163         for (i = 0; i < lp->d_npartitions; i++) {
1164                 pp = &lp->d_partitions[i];
1165                 if (part_set[i]) {
1166                         if (part_size_type[i] == '*') {
1167                                 if (i == RAW_PART) {
1168                                         pp->p_size = lp->d_secperunit;
1169                                 } else {
1170                                         if (hog_part != -1)
1171                                                 warnx("Too many '*' partitions (%c and %c)",
1172                                                     hog_part + 'a',i + 'a');
1173                                         else
1174                                                 hog_part = i;
1175                                 }
1176                         } else {
1177                                 off_t size;
1178
1179                                 size = pp->p_size;
1180                                 switch (part_size_type[i]) {
1181                                 case '%':
1182                                         total_percent += size;
1183                                         break;
1184                                 case 't':
1185                                 case 'T':
1186                                         size *= 1024ULL;
1187                                         /* FALLTHROUGH */
1188                                 case 'g':
1189                                 case 'G':
1190                                         size *= 1024ULL;
1191                                         /* FALLTHROUGH */
1192                                 case 'm':
1193                                 case 'M':
1194                                         size *= 1024ULL;
1195                                         /* FALLTHROUGH */
1196                                 case 'k':
1197                                 case 'K':
1198                                         size *= 1024ULL;
1199                                         break;
1200                                 case '\0':
1201                                         break;
1202                                 default:
1203                                         warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1204                                             part_size_type[i], i + 'a');
1205                                         break;
1206                                 }
1207                                 /* don't count %'s yet */
1208                                 if (part_size_type[i] != '%') {
1209                                         /*
1210                                          * for all not in sectors, convert to
1211                                          * sectors
1212                                          */
1213                                         if (part_size_type[i] != '\0') {
1214                                                 if (size % lp->d_secsize != 0)
1215                                                         warnx("partition %c not an integer number of sectors",
1216                                                             i + 'a');
1217                                                 size /= lp->d_secsize;
1218                                                 pp->p_size = size;
1219                                         }
1220                                         /* else already in sectors */
1221                                         if (i != RAW_PART)
1222                                                 total_size += size;
1223                                 }
1224                         }
1225                 }
1226         }
1227
1228         /* Find out the total free space, excluding the boot block area. */
1229         base_offset = BBSIZE / secsize;
1230         free_space = 0;
1231         for (i = 0; i < lp->d_npartitions; i++) {
1232                 pp = &lp->d_partitions[i];
1233                 if (!part_set[i] || i == RAW_PART ||
1234                     part_size_type[i] == '%' || part_size_type[i] == '*')
1235                         continue;
1236                 if (pp->p_offset > base_offset)
1237                         free_space += pp->p_offset - base_offset;
1238                 if (pp->p_offset + pp->p_size > base_offset)
1239                         base_offset = pp->p_offset + pp->p_size;
1240         }
1241         if (base_offset < lp->d_secperunit)
1242                 free_space += lp->d_secperunit - base_offset;
1243
1244         /* handle % partitions - note %'s don't need to add up to 100! */
1245         if (total_percent != 0) {
1246                 if (total_percent > 100) {
1247                         fprintf(stderr,"total percentage %lu is greater than 100\n",
1248                             total_percent);
1249                         errors++;
1250                 }
1251
1252                 if (free_space > 0) {
1253                         for (i = 0; i < lp->d_npartitions; i++) {
1254                                 pp = &lp->d_partitions[i];
1255                                 if (part_set[i] && part_size_type[i] == '%') {
1256                                         /* careful of overflows! and integer roundoff */
1257                                         pp->p_size = ((double)pp->p_size/100) * free_space;
1258                                         total_size += pp->p_size;
1259
1260                                         /* FIX we can lose a sector or so due to roundoff per
1261                                            partition.  A more complex algorithm could avoid that */
1262                                 }
1263                         }
1264                 } else {
1265                         fprintf(stderr,
1266                             "%ld sectors available to give to '*' and '%%' partitions\n",
1267                             free_space);
1268                         errors++;
1269                         /* fix?  set all % partitions to size 0? */
1270                 }
1271         }
1272         /* give anything remaining to the hog partition */
1273         if (hog_part != -1) {
1274                 /*
1275                  * Find the range of offsets usable by '*' partitions around
1276                  * the hog partition and how much space they need.
1277                  */
1278                 needed = 0;
1279                 base_offset = BBSIZE / secsize;
1280                 for (i = hog_part - 1; i >= 0; i--) {
1281                         pp = &lp->d_partitions[i];
1282                         if (!part_set[i] || i == RAW_PART)
1283                                 continue;
1284                         if (part_offset_type[i] == '*') {
1285                                 needed += pp->p_size;
1286                                 continue;
1287                         }
1288                         base_offset = pp->p_offset + pp->p_size;
1289                         break;
1290                 }
1291                 current_offset = lp->d_secperunit;
1292                 for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1293                         pp = &lp->d_partitions[i];
1294                         if (!part_set[i] || i == RAW_PART)
1295                                 continue;
1296                         if (part_offset_type[i] == '*') {
1297                                 needed += pp->p_size;
1298                                 continue;
1299                         }
1300                         current_offset = pp->p_offset;
1301                 }
1302
1303                 if (current_offset - base_offset <= needed) {
1304                         fprintf(stderr, "Cannot find space for partition %c\n",
1305                             hog_part + 'a');
1306                         fprintf(stderr,
1307                             "Need more than %lu sectors between %lu and %lu\n",
1308                             needed, base_offset, current_offset);
1309                         errors++;
1310                         lp->d_partitions[hog_part].p_size = 0;
1311                 } else {
1312                         lp->d_partitions[hog_part].p_size = current_offset -
1313                             base_offset - needed;
1314                         total_size += lp->d_partitions[hog_part].p_size;
1315                 }
1316         }
1317
1318         /* Now set the offsets for each partition */
1319         current_offset = BBSIZE / secsize; /* in sectors */
1320         seen_default_offset = 0;
1321         for (i = 0; i < lp->d_npartitions; i++) {
1322                 part = 'a' + i;
1323                 pp = &lp->d_partitions[i];
1324                 if (part_set[i]) {
1325                         if (part_offset_type[i] == '*') {
1326                                 if (i == RAW_PART) {
1327                                         pp->p_offset = 0;
1328                                 } else {
1329                                         pp->p_offset = current_offset;
1330                                         seen_default_offset = 1;
1331                                 }
1332                         } else {
1333                                 /* allow them to be out of order for old-style tables */
1334                                 if (pp->p_offset < current_offset &&
1335                                     seen_default_offset && i != RAW_PART &&
1336                                     pp->p_fstype != FS_VINUM) {
1337                                         fprintf(stderr,
1338 "Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1339                                             (long)pp->p_offset,i+'a',current_offset);
1340                                         fprintf(stderr,
1341 "Labels with any *'s for offset must be in ascending order by sector\n");
1342                                         errors++;
1343                                 } else if (pp->p_offset != current_offset &&
1344                                     i != RAW_PART && seen_default_offset) {
1345                                         /*
1346                                          * this may give unneeded warnings if
1347                                          * partitions are out-of-order
1348                                          */
1349                                         warnx(
1350 "Offset %ld for partition %c doesn't match expected value %ld",
1351                                             (long)pp->p_offset, i + 'a', current_offset);
1352                                 }
1353                         }
1354                         if (i != RAW_PART)
1355                                 current_offset = pp->p_offset + pp->p_size;
1356                 }
1357         }
1358
1359         for (i = 0; i < lp->d_npartitions; i++) {
1360                 part = 'a' + i;
1361                 pp = &lp->d_partitions[i];
1362                 if (pp->p_size == 0 && pp->p_offset != 0)
1363                         warnx("partition %c: size 0, but offset %lu",
1364                             part, (u_long)pp->p_offset);
1365 #ifdef notdef
1366                 if (pp->p_size % lp->d_secpercyl)
1367                         warnx("partition %c: size %% cylinder-size != 0",
1368                             part);
1369                 if (pp->p_offset % lp->d_secpercyl)
1370                         warnx("partition %c: offset %% cylinder-size != 0",
1371                             part);
1372 #endif
1373                 if (pp->p_offset > lp->d_secperunit) {
1374                         fprintf(stderr,
1375                             "partition %c: offset past end of unit\n", part);
1376                         errors++;
1377                 }
1378                 if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1379                         fprintf(stderr,
1380                         "partition %c: partition extends past end of unit\n",
1381                             part);
1382                         errors++;
1383                 }
1384                 if (i == RAW_PART) {
1385                         if (pp->p_fstype != FS_UNUSED)
1386                                 warnx("partition %c is not marked as unused!",part);
1387                         if (pp->p_offset != 0)
1388                                 warnx("partition %c doesn't start at 0!",part);
1389                         if (pp->p_size != lp->d_secperunit)
1390                                 warnx("partition %c doesn't cover the whole unit!",part);
1391
1392                         if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1393                             (pp->p_size != lp->d_secperunit)) {
1394                                 warnx("An incorrect partition %c may cause problems for "
1395                                     "standard system utilities",part);
1396                         }
1397                 }
1398
1399                 /* check for overlaps */
1400                 /* this will check for all possible overlaps once and only once */
1401                 for (j = 0; j < i; j++) {
1402                         pp2 = &lp->d_partitions[j];
1403                         if (j != RAW_PART && i != RAW_PART &&
1404                             pp->p_fstype != FS_VINUM &&
1405                             pp2->p_fstype != FS_VINUM &&
1406                             part_set[i] && part_set[j]) {
1407                                 if (pp2->p_offset < pp->p_offset + pp->p_size &&
1408                                     (pp2->p_offset + pp2->p_size > pp->p_offset ||
1409                                         pp2->p_offset >= pp->p_offset)) {
1410                                         fprintf(stderr,"partitions %c and %c overlap!\n",
1411                                             j + 'a', i + 'a');
1412                                         errors++;
1413                                 }
1414                         }
1415                 }
1416         }
1417         for (; i < lp->d_npartitions; i++) {
1418                 part = 'a' + i;
1419                 pp = &lp->d_partitions[i];
1420                 if (pp->p_size || pp->p_offset)
1421                         warnx("unused partition %c: size %d offset %lu",
1422                             'a' + i, pp->p_size, (u_long)pp->p_offset);
1423         }
1424         return (errors);
1425 }
1426
1427 /*
1428  * When operating on a "virgin" disk, try getting an initial label
1429  * from the associated device driver.  This might work for all device
1430  * drivers that are able to fetch some initial device parameters
1431  * without even having access to a (BSD) disklabel, like SCSI disks,
1432  * most IDE drives, or vn devices.
1433  *
1434  * The device name must be given in its "canonical" form.
1435  */
1436 static struct disklabel *
1437 getvirginlabel(void)
1438 {
1439         static struct disklabel loclab;
1440         struct partition *dp;
1441         int f;
1442         u_int u;
1443
1444         if ((f = open(specname, O_RDONLY)) == -1) {
1445                 warn("cannot open %s", specname);
1446                 return (NULL);
1447         }
1448
1449         if (is_file)
1450                 get_file_parms(f);
1451         else {
1452                 mediasize = g_mediasize(f);
1453                 secsize = g_sectorsize(f);
1454                 if (secsize < 0 || mediasize < 0) {
1455                         close (f);
1456                         return (NULL);
1457                 }
1458         }
1459         memset(&loclab, 0, sizeof loclab);
1460         loclab.d_magic = DISKMAGIC;
1461         loclab.d_magic2 = DISKMAGIC;
1462         loclab.d_secsize = secsize;
1463         loclab.d_secperunit = mediasize / secsize;
1464
1465         /*
1466          * Nobody in these enligthened days uses the CHS geometry for
1467          * anything, but nontheless try to get it right.  If we fail
1468          * to get any good ideas from the device, construct something
1469          * which is IBM-PC friendly.
1470          */
1471         if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1472                 loclab.d_nsectors = u;
1473         else
1474                 loclab.d_nsectors = 63;
1475         if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1476                 loclab.d_ntracks = u;
1477         else if (loclab.d_secperunit <= 63*1*1024)
1478                 loclab.d_ntracks = 1;
1479         else if (loclab.d_secperunit <= 63*16*1024)
1480                 loclab.d_ntracks = 16;
1481         else
1482                 loclab.d_ntracks = 255;
1483         loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1484         loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1485         loclab.d_npartitions = DEFPARTITIONS;
1486
1487         /* Various (unneeded) compat stuff */
1488         loclab.d_rpm = 3600;
1489         loclab.d_bbsize = BBSIZE;
1490         loclab.d_interleave = 1;
1491         strncpy(loclab.d_typename, "amnesiac",
1492             sizeof(loclab.d_typename));
1493
1494         dp = &loclab.d_partitions[RAW_PART];
1495         dp->p_size = loclab.d_secperunit;
1496         loclab.d_checksum = dkcksum(&loclab);
1497         close (f);
1498         return (&loclab);
1499 }
1500
1501 static void
1502 usage(void)
1503 {
1504
1505         fprintf(stderr,
1506         "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1507         "usage: bsdlabel disk",
1508         "\t\t(to read label)",
1509         "       bsdlabel -w [-n] [-m machine] disk [type]",
1510         "\t\t(to write label with existing boot program)",
1511         "       bsdlabel -e [-n] [-m machine] disk",
1512         "\t\t(to edit label)",
1513         "       bsdlabel -R [-n] [-m machine] disk protofile",
1514         "\t\t(to restore label with existing boot program)",
1515         "       bsdlabel -B [-b boot] [-m machine] disk",
1516         "\t\t(to install boot program with existing on-disk label)",
1517         "       bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1518         "\t\t(to write label and install boot program)",
1519         "       bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1520                 "\t\t(to restore label and install boot program)"
1521         );
1522         exit(1);
1523 }