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 off_t mbroffset;
 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 += mbroffset;
 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         int f, i;
 483         int error;
 484         struct gctl_req *grq;
 485         char const *errstr;
 486
 487         f = open(specname, O_RDONLY);
 488         if (f < 0)
 489                 err(1, specname);
 490         if (is_file)
 491                 get_file_parms(f);
 492         else {
 493                 mediasize = g_mediasize(f);
 494                 secsize = g_sectorsize(f);
 495                 if (secsize < 0 || mediasize < 0)
 496                         err(4, "cannot get disk geometry");
 497         }
 498         if (mediasize > (off_t)0xffffffff * secsize)
 499                 errx(1,
 500                     "disks with more than 2^32-1 sectors are not supported");
 501         (void)lseek(f, (off_t)0, SEEK_SET);
 502         if (read(f, bootarea, BBSIZE) != BBSIZE)
 503                 err(4, "%s read", specname);
 504         close (f);
 505         error = bsd_disklabel_le_dec(
 506             bootarea + (labeloffset + labelsoffset * secsize),
 507             &lab, MAXPARTITIONS);
 508         if (flag && error)
 509                 errx(1, "%s: no valid label found", specname);
 510
 511         if (is_file)
 512                 return(0);
 513         grq = gctl_get_handle();
 514         gctl_ro_param(grq, "verb", -1, "read mbroffset");
 515         gctl_ro_param(grq, "class", -1, "BSD");
 516         gctl_ro_param(grq, "geom", -1, pname);
 517         gctl_rw_param(grq, "mbroffset", sizeof(mbroffset), &mbroffset);
 518         errstr = gctl_issue(grq);
 519         if (errstr != NULL) {
 520                 mbroffset = 0;
 521                 gctl_free(grq);
 522                 return (error);
 523         }
 524         mbroffset /= lab.d_secsize;
 525         if (lab.d_partitions[RAW_PART].p_offset == mbroffset)
 526                 for (i = 0; i < lab.d_npartitions; i++)
 527                         if (lab.d_partitions[i].p_size)
 528                                 lab.d_partitions[i].p_offset -= mbroffset;
 529         return (error);
 530 }
 531
 532
 533 static void
 534 display(FILE *f, const struct disklabel *lp)
 535 {
 536         int i, j;
 537         const struct partition *pp;
 538
 539         if (lp == NULL)
 540                 lp = &lab;
 541
 542         fprintf(f, "# %s:\n", specname);
 543         if (allfields) {
 544                 if (lp->d_type < DKMAXTYPES)
 545                         fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
 546                 else
 547                         fprintf(f, "type: %u\n", lp->d_type);
 548                 fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
 549                         lp->d_typename);
 550                 fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
 551                         lp->d_packname);
 552                 fprintf(f, "flags:");
 553                 if (lp->d_flags & D_REMOVABLE)
 554                         fprintf(f, " removeable");
 555                 if (lp->d_flags & D_ECC)
 556                         fprintf(f, " ecc");
 557                 if (lp->d_flags & D_BADSECT)
 558                         fprintf(f, " badsect");
 559                 fprintf(f, "\n");
 560                 fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
 561                 fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
 562                 fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
 563                 fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
 564                 fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
 565                 fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
 566                 fprintf(f, "rpm: %u\n", lp->d_rpm);
 567                 fprintf(f, "interleave: %u\n", lp->d_interleave);
 568                 fprintf(f, "trackskew: %u\n", lp->d_trackskew);
 569                 fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
 570                 fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
 571                     (u_long)lp->d_headswitch);
 572                 fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
 573                     (u_long)lp->d_trkseek);
 574                 fprintf(f, "drivedata: ");
 575                 for (i = NDDATA - 1; i >= 0; i--)
 576                         if (lp->d_drivedata[i])
 577                                 break;
 578                 if (i < 0)
 579                         i = 0;
 580                 for (j = 0; j <= i; j++)
 581                         fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
 582                 fprintf(f, "\n\n");
 583         }
 584         fprintf(f, "%u partitions:\n", lp->d_npartitions);
 585         fprintf(f,
 586             "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
 587         pp = lp->d_partitions;
 588         for (i = 0; i < lp->d_npartitions; i++, pp++) {
 589                 if (pp->p_size) {
 590                         fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
 591                            (u_long)pp->p_size, (u_long)pp->p_offset);
 592                         if (pp->p_fstype < FSMAXTYPES)
 593                                 fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
 594                         else
 595                                 fprintf(f, "%8d", pp->p_fstype);
 596                         switch (pp->p_fstype) {
 597
 598                         case FS_UNUSED:                         /* XXX */
 599                                 fprintf(f, "    %5lu %5lu %5.5s ",
 600                                     (u_long)pp->p_fsize,
 601                                     (u_long)(pp->p_fsize * pp->p_frag), "");
 602                                 break;
 603
 604                         case FS_BSDFFS:
 605                                 fprintf(f, "    %5lu %5lu %5u ",
 606                                     (u_long)pp->p_fsize,
 607                                     (u_long)(pp->p_fsize * pp->p_frag),
 608                                     pp->p_cpg);
 609                                 break;
 610
 611                         case FS_BSDLFS:
 612                                 fprintf(f, "    %5lu %5lu %5d",
 613                                     (u_long)pp->p_fsize,
 614                                     (u_long)(pp->p_fsize * pp->p_frag),
 615                                     pp->p_cpg);
 616                                 break;
 617
 618                         default:
 619                                 fprintf(f, "%20.20s", "");
 620                                 break;
 621                         }
 622                         if (i == RAW_PART) {
 623                                 fprintf(f, "  # \"raw\" part, don't edit");
 624                         }
 625                         fprintf(f, "\n");
 626                 }
 627         }
 628         fflush(f);
 629 }
 630
 631 static int
 632 edit(void)
 633 {
 634         int c, fd;
 635         struct disklabel label;
 636         FILE *fp;
 637
 638         if ((fd = mkstemp(tmpfil)) == -1 ||
 639             (fp = fdopen(fd, "w")) == NULL) {
 640                 warnx("can't create %s", tmpfil);
 641                 return (1);
 642         }
 643         display(fp, NULL);
 644         fclose(fp);
 645         for (;;) {
 646                 if (!editit())
 647                         break;
 648                 fp = fopen(tmpfil, "r");
 649                 if (fp == NULL) {
 650                         warnx("can't reopen %s for reading", tmpfil);
 651                         break;
 652                 }
 653                 bzero((char *)&label, sizeof(label));
 654                 c = getasciilabel(fp, &label);
 655                 fclose(fp);
 656                 if (c) {
 657                         lab = label;
 658                         if (writelabel() == 0) {
 659                                 (void) unlink(tmpfil);
 660                                 return (0);
 661                         }
 662                 }
 663                 printf("re-edit the label? [y]: ");
 664                 fflush(stdout);
 665                 c = getchar();
 666                 if (c != EOF && c != (int)'\n')
 667                         while (getchar() != (int)'\n')
 668                                 ;
 669                 if  (c == (int)'n')
 670                         break;
 671         }
 672         (void) unlink(tmpfil);
 673         return (1);
 674 }
 675
 676 static int
 677 editit(void)
 678 {
 679         int pid, xpid;
 680         int locstat, omask;
 681         const char *ed;
 682
 683         omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 684         while ((pid = fork()) < 0) {
 685                 if (errno == EPROCLIM) {
 686                         warnx("you have too many processes");
 687                         return(0);
 688                 }
 689                 if (errno != EAGAIN) {
 690                         warn("fork");
 691                         return(0);
 692                 }
 693                 sleep(1);
 694         }
 695         if (pid == 0) {
 696                 sigsetmask(omask);
 697                 setgid(getgid());
 698                 setuid(getuid());
 699                 if ((ed = getenv("EDITOR")) == (char *)0)
 700                         ed = DEFEDITOR;
 701                 execlp(ed, ed, tmpfil, (char *)0);
 702                 err(1, "%s", ed);
 703         }
 704         while ((xpid = wait(&locstat)) >= 0)
 705                 if (xpid == pid)
 706                         break;
 707         sigsetmask(omask);
 708         return(!locstat);
 709 }
 710
 711 static char *
 712 skip(char *cp)
 713 {
 714
 715         while (*cp != '\0' && isspace(*cp))
 716                 cp++;
 717         if (*cp == '\0' || *cp == '#')
 718                 return (NULL);
 719         return (cp);
 720 }
 721
 722 static char *
 723 word(char *cp)
 724 {
 725         char c;
 726
 727         while (*cp != '\0' && !isspace(*cp) && *cp != '#')
 728                 cp++;
 729         if ((c = *cp) != '\0') {
 730                 *cp++ = '\0';
 731                 if (c != '#')
 732                         return (skip(cp));
 733         }
 734         return (NULL);
 735 }
 736
 737 /*
 738  * Read an ascii label in from fd f,
 739  * in the same format as that put out by display(),
 740  * and fill in lp.
 741  */
 742 static int
 743 getasciilabel(FILE *f, struct disklabel *lp)
 744 {
 745         char *cp;
 746         const char **cpp;
 747         u_int part;
 748         char *tp, line[BUFSIZ];
 749         u_long v;
 750         int lineno = 0, errors = 0;
 751         int i;
 752
 753         makelabel("auto", lp);
 754         bzero(&part_set, sizeof(part_set));
 755         bzero(&part_size_type, sizeof(part_size_type));
 756         bzero(&part_offset_type, sizeof(part_offset_type));
 757         lp->d_bbsize = BBSIZE;                          /* XXX */
 758         lp->d_sbsize = 0;                               /* XXX */
 759         while (fgets(line, sizeof(line) - 1, f)) {
 760                 lineno++;
 761                 if ((cp = index(line,'\n')) != 0)
 762                         *cp = '\0';
 763                 cp = skip(line);
 764                 if (cp == NULL)
 765                         continue;
 766                 tp = index(cp, ':');
 767                 if (tp == NULL) {
 768                         fprintf(stderr, "line %d: syntax error\n", lineno);
 769                         errors++;
 770                         continue;
 771                 }
 772                 *tp++ = '\0', tp = skip(tp);
 773                 if (!strcmp(cp, "type")) {
 774                         if (tp == NULL)
 775                                 tp = unknown;
 776                         cpp = dktypenames;
 777                         for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
 778                                 if (*cpp && !strcmp(*cpp, tp)) {
 779                                         lp->d_type = cpp - dktypenames;
 780                                         break;
 781                                 }
 782                         if (cpp < &dktypenames[DKMAXTYPES])
 783                                 continue;
 784                         v = strtoul(tp, NULL, 10);
 785                         if (v >= DKMAXTYPES)
 786                                 fprintf(stderr, "line %d:%s %lu\n", lineno,
 787                                     "Warning, unknown disk type", v);
 788                         lp->d_type = v;
 789                         continue;
 790                 }
 791                 if (!strcmp(cp, "flags")) {
 792                         for (v = 0; (cp = tp) && *cp != '\0';) {
 793                                 tp = word(cp);
 794                                 if (!strcmp(cp, "removeable"))
 795                                         v |= D_REMOVABLE;
 796                                 else if (!strcmp(cp, "ecc"))
 797                                         v |= D_ECC;
 798                                 else if (!strcmp(cp, "badsect"))
 799                                         v |= D_BADSECT;
 800                                 else {
 801                                         fprintf(stderr,
 802                                             "line %d: %s: bad flag\n",
 803                                             lineno, cp);
 804                                         errors++;
 805                                 }
 806                         }
 807                         lp->d_flags = v;
 808                         continue;
 809                 }
 810                 if (!strcmp(cp, "drivedata")) {
 811                         for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
 812                                 lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
 813                                 tp = word(cp);
 814                         }
 815                         continue;
 816                 }
 817                 if (sscanf(cp, "%lu partitions", &v) == 1) {
 818                         if (v == 0 || v > MAXPARTITIONS) {
 819                                 fprintf(stderr,
 820                                     "line %d: bad # of partitions\n", lineno);
 821                                 lp->d_npartitions = MAXPARTITIONS;
 822                                 errors++;
 823                         } else
 824                                 lp->d_npartitions = v;
 825                         continue;
 826                 }
 827                 if (tp == NULL)
 828                         tp = blank;
 829                 if (!strcmp(cp, "disk")) {
 830                         strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
 831                         continue;
 832                 }
 833                 if (!strcmp(cp, "label")) {
 834                         strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
 835                         continue;
 836                 }
 837                 if (!strcmp(cp, "bytes/sector")) {
 838                         v = strtoul(tp, NULL, 10);
 839                         if (v == 0 || (v % DEV_BSIZE) != 0) {
 840                                 fprintf(stderr,
 841                                     "line %d: %s: bad sector size\n",
 842                                     lineno, tp);
 843                                 errors++;
 844                         } else
 845                                 lp->d_secsize = v;
 846                         continue;
 847                 }
 848                 if (!strcmp(cp, "sectors/track")) {
 849                         v = strtoul(tp, NULL, 10);
 850 #if (ULONG_MAX != 0xffffffffUL)
 851                         if (v == 0 || v > 0xffffffff)
 852 #else
 853                         if (v == 0)
 854 #endif
 855                         {
 856                                 fprintf(stderr, "line %d: %s: bad %s\n",
 857                                     lineno, tp, cp);
 858                                 errors++;
 859                         } else
 860                                 lp->d_nsectors = v;
 861                         continue;
 862                 }
 863                 if (!strcmp(cp, "sectors/cylinder")) {
 864                         v = strtoul(tp, NULL, 10);
 865                         if (v == 0) {
 866                                 fprintf(stderr, "line %d: %s: bad %s\n",
 867                                     lineno, tp, cp);
 868                                 errors++;
 869                         } else
 870                                 lp->d_secpercyl = v;
 871                         continue;
 872                 }
 873                 if (!strcmp(cp, "tracks/cylinder")) {
 874                         v = strtoul(tp, NULL, 10);
 875                         if (v == 0) {
 876                                 fprintf(stderr, "line %d: %s: bad %s\n",
 877                                     lineno, tp, cp);
 878                                 errors++;
 879                         } else
 880                                 lp->d_ntracks = v;
 881                         continue;
 882                 }
 883                 if (!strcmp(cp, "cylinders")) {
 884                         v = strtoul(tp, NULL, 10);
 885                         if (v == 0) {
 886                                 fprintf(stderr, "line %d: %s: bad %s\n",
 887                                     lineno, tp, cp);
 888                                 errors++;
 889                         } else
 890                                 lp->d_ncylinders = v;
 891                         continue;
 892                 }
 893                 if (!strcmp(cp, "sectors/unit")) {
 894                         v = strtoul(tp, NULL, 10);
 895                         if (v == 0) {
 896                                 fprintf(stderr, "line %d: %s: bad %s\n",
 897                                     lineno, tp, cp);
 898                                 errors++;
 899                         } else
 900                                 lp->d_secperunit = v;
 901                         continue;
 902                 }
 903                 if (!strcmp(cp, "rpm")) {
 904                         v = strtoul(tp, NULL, 10);
 905                         if (v == 0 || v > USHRT_MAX) {
 906                                 fprintf(stderr, "line %d: %s: bad %s\n",
 907                                     lineno, tp, cp);
 908                                 errors++;
 909                         } else
 910                                 lp->d_rpm = v;
 911                         continue;
 912                 }
 913                 if (!strcmp(cp, "interleave")) {
 914                         v = strtoul(tp, NULL, 10);
 915                         if (v == 0 || v > USHRT_MAX) {
 916                                 fprintf(stderr, "line %d: %s: bad %s\n",
 917                                     lineno, tp, cp);
 918                                 errors++;
 919                         } else
 920                                 lp->d_interleave = v;
 921                         continue;
 922                 }
 923                 if (!strcmp(cp, "trackskew")) {
 924                         v = strtoul(tp, NULL, 10);
 925                         if (v > USHRT_MAX) {
 926                                 fprintf(stderr, "line %d: %s: bad %s\n",
 927                                     lineno, tp, cp);
 928                                 errors++;
 929                         } else
 930                                 lp->d_trackskew = v;
 931                         continue;
 932                 }
 933                 if (!strcmp(cp, "cylinderskew")) {
 934                         v = strtoul(tp, NULL, 10);
 935                         if (v > USHRT_MAX) {
 936                                 fprintf(stderr, "line %d: %s: bad %s\n",
 937                                     lineno, tp, cp);
 938                                 errors++;
 939                         } else
 940                                 lp->d_cylskew = v;
 941                         continue;
 942                 }
 943                 if (!strcmp(cp, "headswitch")) {
 944                         v = strtoul(tp, NULL, 10);
 945                         lp->d_headswitch = v;
 946                         continue;
 947                 }
 948                 if (!strcmp(cp, "track-to-track seek")) {
 949                         v = strtoul(tp, NULL, 10);
 950                         lp->d_trkseek = v;
 951                         continue;
 952                 }
 953                 /* the ':' was removed above */
 954                 if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
 955                         fprintf(stderr,
 956                             "line %d: %s: Unknown disklabel field\n", lineno,
 957                             cp);
 958                         errors++;
 959                         continue;
 960                 }
 961
 962                 /* Process a partition specification line. */
 963                 part = *cp - 'a';
 964                 if (part >= lp->d_npartitions) {
 965                         fprintf(stderr,
 966                             "line %d: partition name out of range a-%c: %s\n",
 967                             lineno, 'a' + lp->d_npartitions - 1, cp);
 968                         errors++;
 969                         continue;
 970                 }
 971                 part_set[part] = 1;
 972
 973                 if (getasciipartspec(tp, lp, part, lineno) != 0) {
 974                         errors++;
 975                         break;
 976                 }
 977         }
 978         errors += checklabel(lp);
 979         return (errors == 0);
 980 }
 981
 982 #define NXTNUM(n) do { \
 983         if (tp == NULL) { \
 984                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
 985                 return (1); \
 986         } else { \
 987                 cp = tp, tp = word(cp); \
 988                 (n) = strtoul(cp, NULL, 10); \
 989         } \
 990 } while (0)
 991
 992 /* retain 1 character following number */
 993 #define NXTWORD(w,n) do { \
 994         if (tp == NULL) { \
 995                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
 996                 return (1); \
 997         } else { \
 998                 char *tmp; \
 999                 cp = tp, tp = word(cp); \
1000                 (n) = strtoul(cp, &tmp, 10); \
1001                 if (tmp) (w) = *tmp; \
1002         } \
1003 } while (0)
1004
1005 /*
1006  * Read a partition line into partition `part' in the specified disklabel.
1007  * Return 0 on success, 1 on failure.
1008  */
1009 static int
1010 getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1011 {
1012         struct partition *pp;
1013         char *cp;
1014         const char **cpp;
1015         u_long v;
1016
1017         pp = &lp->d_partitions[part];
1018         cp = NULL;
1019
1020         v = 0;
1021         NXTWORD(part_size_type[part],v);
1022         if (v == 0 && part_size_type[part] != '*') {
1023                 fprintf(stderr,
1024                     "line %d: %s: bad partition size\n", lineno, cp);
1025                 return (1);
1026         }
1027         pp->p_size = v;
1028
1029         v = 0;
1030         NXTWORD(part_offset_type[part],v);
1031         if (v == 0 && part_offset_type[part] != '*' &&
1032             part_offset_type[part] != '\0') {
1033                 fprintf(stderr,
1034                     "line %d: %s: bad partition offset\n", lineno, cp);
1035                 return (1);
1036         }
1037         pp->p_offset = v;
1038         if (tp == NULL) {
1039                 fprintf(stderr, "line %d: missing file system type\n", lineno);
1040                 return (1);
1041         }
1042         cp = tp, tp = word(cp);
1043         for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1044                 if (*cpp && !strcmp(*cpp, cp))
1045                         break;
1046         if (*cpp != NULL) {
1047                 pp->p_fstype = cpp - fstypenames;
1048         } else {
1049                 if (isdigit(*cp))
1050                         v = strtoul(cp, NULL, 10);
1051                 else
1052                         v = FSMAXTYPES;
1053                 if (v >= FSMAXTYPES) {
1054                         fprintf(stderr,
1055                             "line %d: Warning, unknown file system type %s\n",
1056                             lineno, cp);
1057                         v = FS_UNUSED;
1058                 }
1059                 pp->p_fstype = v;
1060         }
1061
1062         switch (pp->p_fstype) {
1063         case FS_UNUSED:
1064         case FS_BSDFFS:
1065         case FS_BSDLFS:
1066                 /* accept defaults for fsize/frag/cpg */
1067                 if (tp) {
1068                         NXTNUM(pp->p_fsize);
1069                         if (pp->p_fsize == 0)
1070                                 break;
1071                         NXTNUM(v);
1072                         pp->p_frag = v / pp->p_fsize;
1073                         if (tp != NULL)
1074                                 NXTNUM(pp->p_cpg);
1075                 }
1076                 /* else default to 0's */
1077                 break;
1078         default:
1079                 break;
1080         }
1081         return (0);
1082 }
1083
1084 /*
1085  * Check disklabel for errors and fill in
1086  * derived fields according to supplied values.
1087  */
1088 static int
1089 checklabel(struct disklabel *lp)
1090 {
1091         struct partition *pp;
1092         int i, errors = 0;
1093         char part;
1094         u_long base_offset, needed, total_size, total_percent, current_offset;
1095         long free_space;
1096         int seen_default_offset;
1097         int hog_part;
1098         int j;
1099         struct partition *pp2;
1100
1101         if (lp == NULL)
1102                 lp = &lab;
1103
1104         if (allfields) {
1105
1106                 if (lp->d_secsize == 0) {
1107                         fprintf(stderr, "sector size 0\n");
1108                         return (1);
1109                 }
1110                 if (lp->d_nsectors == 0) {
1111                         fprintf(stderr, "sectors/track 0\n");
1112                         return (1);
1113                 }
1114                 if (lp->d_ntracks == 0) {
1115                         fprintf(stderr, "tracks/cylinder 0\n");
1116                         return (1);
1117                 }
1118                 if  (lp->d_ncylinders == 0) {
1119                         fprintf(stderr, "cylinders/unit 0\n");
1120                         errors++;
1121                 }
1122                 if (lp->d_rpm == 0)
1123                         warnx("revolutions/minute 0");
1124                 if (lp->d_secpercyl == 0)
1125                         lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1126                 if (lp->d_secperunit == 0)
1127                         lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1128                 if (lp->d_bbsize == 0) {
1129                         fprintf(stderr, "boot block size 0\n");
1130                         errors++;
1131                 } else if (lp->d_bbsize % lp->d_secsize)
1132                         warnx("boot block size %% sector-size != 0");
1133                 if (lp->d_npartitions > MAXPARTITIONS)
1134                         warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1135                             (u_long)lp->d_npartitions, MAXPARTITIONS);
1136         } else {
1137                 struct disklabel *vl;
1138
1139                 vl = getvirginlabel();
1140                 lp->d_secsize = vl->d_secsize;
1141                 lp->d_nsectors = vl->d_nsectors;
1142                 lp->d_ntracks = vl->d_ntracks;
1143                 lp->d_ncylinders = vl->d_ncylinders;
1144                 lp->d_rpm = vl->d_rpm;
1145                 lp->d_interleave = vl->d_interleave;
1146                 lp->d_secpercyl = vl->d_secpercyl;
1147                 lp->d_secperunit = vl->d_secperunit;
1148                 lp->d_bbsize = vl->d_bbsize;
1149                 lp->d_npartitions = vl->d_npartitions;
1150         }
1151
1152
1153         /* first allocate space to the partitions, then offsets */
1154         total_size = 0; /* in sectors */
1155         total_percent = 0; /* in percent */
1156         hog_part = -1;
1157         /* find all fixed partitions */
1158         for (i = 0; i < lp->d_npartitions; i++) {
1159                 pp = &lp->d_partitions[i];
1160                 if (part_set[i]) {
1161                         if (part_size_type[i] == '*') {
1162                                 if (i == RAW_PART) {
1163                                         pp->p_size = lp->d_secperunit;
1164                                 } else {
1165                                         if (hog_part != -1)
1166                                                 warnx("Too many '*' partitions (%c and %c)",
1167                                                     hog_part + 'a',i + 'a');
1168                                         else
1169                                                 hog_part = i;
1170                                 }
1171                         } else {
1172                                 off_t size;
1173
1174                                 size = pp->p_size;
1175                                 switch (part_size_type[i]) {
1176                                 case '%':
1177                                         total_percent += size;
1178                                         break;
1179                                 case 't':
1180                                 case 'T':
1181                                         size *= 1024ULL;
1182                                         /* FALLTHROUGH */
1183                                 case 'g':
1184                                 case 'G':
1185                                         size *= 1024ULL;
1186                                         /* FALLTHROUGH */
1187                                 case 'm':
1188                                 case 'M':
1189                                         size *= 1024ULL;
1190                                         /* FALLTHROUGH */
1191                                 case 'k':
1192                                 case 'K':
1193                                         size *= 1024ULL;
1194                                         break;
1195                                 case '\0':
1196                                         break;
1197                                 default:
1198                                         warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1199                                             part_size_type[i], i + 'a');
1200                                         break;
1201                                 }
1202                                 /* don't count %'s yet */
1203                                 if (part_size_type[i] != '%') {
1204                                         /*
1205                                          * for all not in sectors, convert to
1206                                          * sectors
1207                                          */
1208                                         if (part_size_type[i] != '\0') {
1209                                                 if (size % lp->d_secsize != 0)
1210                                                         warnx("partition %c not an integer number of sectors",
1211                                                             i + 'a');
1212                                                 size /= lp->d_secsize;
1213                                                 pp->p_size = size;
1214                                         }
1215                                         /* else already in sectors */
1216                                         if (i != RAW_PART)
1217                                                 total_size += size;
1218                                 }
1219                         }
1220                 }
1221         }
1222
1223         /* Find out the total free space, excluding the boot block area. */
1224         base_offset = BBSIZE / secsize;
1225         free_space = 0;
1226         for (i = 0; i < lp->d_npartitions; i++) {
1227                 pp = &lp->d_partitions[i];
1228                 if (!part_set[i] || i == RAW_PART ||
1229                     part_size_type[i] == '%' || part_size_type[i] == '*')
1230                         continue;
1231                 if (pp->p_offset > base_offset)
1232                         free_space += pp->p_offset - base_offset;
1233                 if (pp->p_offset + pp->p_size > base_offset)
1234                         base_offset = pp->p_offset + pp->p_size;
1235         }
1236         if (base_offset < lp->d_secperunit)
1237                 free_space += lp->d_secperunit - base_offset;
1238
1239         /* handle % partitions - note %'s don't need to add up to 100! */
1240         if (total_percent != 0) {
1241                 if (total_percent > 100) {
1242                         fprintf(stderr,"total percentage %lu is greater than 100\n",
1243                             total_percent);
1244                         errors++;
1245                 }
1246
1247                 if (free_space > 0) {
1248                         for (i = 0; i < lp->d_npartitions; i++) {
1249                                 pp = &lp->d_partitions[i];
1250                                 if (part_set[i] && part_size_type[i] == '%') {
1251                                         /* careful of overflows! and integer roundoff */
1252                                         pp->p_size = ((double)pp->p_size/100) * free_space;
1253                                         total_size += pp->p_size;
1254
1255                                         /* FIX we can lose a sector or so due to roundoff per
1256                                            partition.  A more complex algorithm could avoid that */
1257                                 }
1258                         }
1259                 } else {
1260                         fprintf(stderr,
1261                             "%ld sectors available to give to '*' and '%%' partitions\n",
1262                             free_space);
1263                         errors++;
1264                         /* fix?  set all % partitions to size 0? */
1265                 }
1266         }
1267         /* give anything remaining to the hog partition */
1268         if (hog_part != -1) {
1269                 /*
1270                  * Find the range of offsets usable by '*' partitions around
1271                  * the hog partition and how much space they need.
1272                  */
1273                 needed = 0;
1274                 base_offset = BBSIZE / secsize;
1275                 for (i = hog_part - 1; i >= 0; i--) {
1276                         pp = &lp->d_partitions[i];
1277                         if (!part_set[i] || i == RAW_PART)
1278                                 continue;
1279                         if (part_offset_type[i] == '*') {
1280                                 needed += pp->p_size;
1281                                 continue;
1282                         }
1283                         base_offset = pp->p_offset + pp->p_size;
1284                         break;
1285                 }
1286                 current_offset = lp->d_secperunit;
1287                 for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1288                         pp = &lp->d_partitions[i];
1289                         if (!part_set[i] || i == RAW_PART)
1290                                 continue;
1291                         if (part_offset_type[i] == '*') {
1292                                 needed += pp->p_size;
1293                                 continue;
1294                         }
1295                         current_offset = pp->p_offset;
1296                 }
1297
1298                 if (current_offset - base_offset <= needed) {
1299                         fprintf(stderr, "Cannot find space for partition %c\n",
1300                             hog_part + 'a');
1301                         fprintf(stderr,
1302                             "Need more than %lu sectors between %lu and %lu\n",
1303                             needed, base_offset, current_offset);
1304                         errors++;
1305                         lp->d_partitions[hog_part].p_size = 0;
1306                 } else {
1307                         lp->d_partitions[hog_part].p_size = current_offset -
1308                             base_offset - needed;
1309                         total_size += lp->d_partitions[hog_part].p_size;
1310                 }
1311         }
1312
1313         /* Now set the offsets for each partition */
1314         current_offset = BBSIZE / secsize; /* in sectors */
1315         seen_default_offset = 0;
1316         for (i = 0; i < lp->d_npartitions; i++) {
1317                 part = 'a' + i;
1318                 pp = &lp->d_partitions[i];
1319                 if (part_set[i]) {
1320                         if (part_offset_type[i] == '*') {
1321                                 if (i == RAW_PART) {
1322                                         pp->p_offset = 0;
1323                                 } else {
1324                                         pp->p_offset = current_offset;
1325                                         seen_default_offset = 1;
1326                                 }
1327                         } else {
1328                                 /* allow them to be out of order for old-style tables */
1329                                 if (pp->p_offset < current_offset &&
1330                                     seen_default_offset && i != RAW_PART &&
1331                                     pp->p_fstype != FS_VINUM) {
1332                                         fprintf(stderr,
1333 "Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1334                                             (long)pp->p_offset,i+'a',current_offset);
1335                                         fprintf(stderr,
1336 "Labels with any *'s for offset must be in ascending order by sector\n");
1337                                         errors++;
1338                                 } else if (pp->p_offset != current_offset &&
1339                                     i != RAW_PART && seen_default_offset) {
1340                                         /*
1341                                          * this may give unneeded warnings if
1342                                          * partitions are out-of-order
1343                                          */
1344                                         warnx(
1345 "Offset %ld for partition %c doesn't match expected value %ld",
1346                                             (long)pp->p_offset, i + 'a', current_offset);
1347                                 }
1348                         }
1349                         if (i != RAW_PART)
1350                                 current_offset = pp->p_offset + pp->p_size;
1351                 }
1352         }
1353
1354         for (i = 0; i < lp->d_npartitions; i++) {
1355                 part = 'a' + i;
1356                 pp = &lp->d_partitions[i];
1357                 if (pp->p_size == 0 && pp->p_offset != 0)
1358                         warnx("partition %c: size 0, but offset %lu",
1359                             part, (u_long)pp->p_offset);
1360 #ifdef notdef
1361                 if (pp->p_size % lp->d_secpercyl)
1362                         warnx("partition %c: size %% cylinder-size != 0",
1363                             part);
1364                 if (pp->p_offset % lp->d_secpercyl)
1365                         warnx("partition %c: offset %% cylinder-size != 0",
1366                             part);
1367 #endif
1368                 if (pp->p_offset > lp->d_secperunit) {
1369                         fprintf(stderr,
1370                             "partition %c: offset past end of unit\n", part);
1371                         errors++;
1372                 }
1373                 if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1374                         fprintf(stderr,
1375                         "partition %c: partition extends past end of unit\n",
1376                             part);
1377                         errors++;
1378                 }
1379                 if (i == RAW_PART) {
1380                         if (pp->p_fstype != FS_UNUSED)
1381                                 warnx("partition %c is not marked as unused!",part);
1382                         if (pp->p_offset != 0)
1383                                 warnx("partition %c doesn't start at 0!",part);
1384                         if (pp->p_size != lp->d_secperunit)
1385                                 warnx("partition %c doesn't cover the whole unit!",part);
1386
1387                         if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1388                             (pp->p_size != lp->d_secperunit)) {
1389                                 warnx("An incorrect partition %c may cause problems for "
1390                                     "standard system utilities",part);
1391                         }
1392                 }
1393
1394                 /* check for overlaps */
1395                 /* this will check for all possible overlaps once and only once */
1396                 for (j = 0; j < i; j++) {
1397                         pp2 = &lp->d_partitions[j];
1398                         if (j != RAW_PART && i != RAW_PART &&
1399                             pp->p_fstype != FS_VINUM &&
1400                             pp2->p_fstype != FS_VINUM &&
1401                             part_set[i] && part_set[j]) {
1402                                 if (pp2->p_offset < pp->p_offset + pp->p_size &&
1403                                     (pp2->p_offset + pp2->p_size > pp->p_offset ||
1404                                         pp2->p_offset >= pp->p_offset)) {
1405                                         fprintf(stderr,"partitions %c and %c overlap!\n",
1406                                             j + 'a', i + 'a');
1407                                         errors++;
1408                                 }
1409                         }
1410                 }
1411         }
1412         for (; i < lp->d_npartitions; i++) {
1413                 part = 'a' + i;
1414                 pp = &lp->d_partitions[i];
1415                 if (pp->p_size || pp->p_offset)
1416                         warnx("unused partition %c: size %d offset %lu",
1417                             'a' + i, pp->p_size, (u_long)pp->p_offset);
1418         }
1419         return (errors);
1420 }
1421
1422 /*
1423  * When operating on a "virgin" disk, try getting an initial label
1424  * from the associated device driver.  This might work for all device
1425  * drivers that are able to fetch some initial device parameters
1426  * without even having access to a (BSD) disklabel, like SCSI disks,
1427  * most IDE drives, or vn devices.
1428  *
1429  * The device name must be given in its "canonical" form.
1430  */
1431 static struct disklabel *
1432 getvirginlabel(void)
1433 {
1434         static struct disklabel loclab;
1435         struct partition *dp;
1436         int f;
1437         u_int u;
1438
1439         if ((f = open(specname, O_RDONLY)) == -1) {
1440                 warn("cannot open %s", specname);
1441                 return (NULL);
1442         }
1443
1444         if (is_file)
1445                 get_file_parms(f);
1446         else {
1447                 mediasize = g_mediasize(f);
1448                 secsize = g_sectorsize(f);
1449                 if (secsize < 0 || mediasize < 0) {
1450                         close (f);
1451                         return (NULL);
1452                 }
1453         }
1454         memset(&loclab, 0, sizeof loclab);
1455         loclab.d_magic = DISKMAGIC;
1456         loclab.d_magic2 = DISKMAGIC;
1457         loclab.d_secsize = secsize;
1458         loclab.d_secperunit = mediasize / secsize;
1459
1460         /*
1461          * Nobody in these enligthened days uses the CHS geometry for
1462          * anything, but nontheless try to get it right.  If we fail
1463          * to get any good ideas from the device, construct something
1464          * which is IBM-PC friendly.
1465          */
1466         if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1467                 loclab.d_nsectors = u;
1468         else
1469                 loclab.d_nsectors = 63;
1470         if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1471                 loclab.d_ntracks = u;
1472         else if (loclab.d_secperunit <= 63*1*1024)
1473                 loclab.d_ntracks = 1;
1474         else if (loclab.d_secperunit <= 63*16*1024)
1475                 loclab.d_ntracks = 16;
1476         else
1477                 loclab.d_ntracks = 255;
1478         loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1479         loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1480         loclab.d_npartitions = DEFPARTITIONS;
1481
1482         /* Various (unneeded) compat stuff */
1483         loclab.d_rpm = 3600;
1484         loclab.d_bbsize = BBSIZE;
1485         loclab.d_interleave = 1;
1486         strncpy(loclab.d_typename, "amnesiac",
1487             sizeof(loclab.d_typename));
1488
1489         dp = &loclab.d_partitions[RAW_PART];
1490         dp->p_size = loclab.d_secperunit;
1491         loclab.d_checksum = dkcksum(&loclab);
1492         close (f);
1493         return (&loclab);
1494 }
1495
1496 static void
1497 usage(void)
1498 {
1499
1500         fprintf(stderr,
1501         "%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",
1502         "usage: bsdlabel disk",
1503         "\t\t(to read label)",
1504         "       bsdlabel -w [-n] [-m machine] disk [type]",
1505         "\t\t(to write label with existing boot program)",
1506         "       bsdlabel -e [-n] [-m machine] disk",
1507         "\t\t(to edit label)",
1508         "       bsdlabel -R [-n] [-m machine] disk protofile",
1509         "\t\t(to restore label with existing boot program)",
1510         "       bsdlabel -B [-b boot] [-m machine] disk",
1511         "\t\t(to install boot program with existing on-disk label)",
1512         "       bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1513         "\t\t(to write label and install boot program)",
1514         "       bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1515                 "\t\t(to restore label and install boot program)"
1516         );
1517         exit(1);
1518 }