usr/src/cmd/format/checkdev.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26
  27
  28 /*
  29  * This file contains miscellaneous device validation routines.
  30  */
  31
  32 #include "global.h"
  33 #include <sys/mnttab.h>
  34 #include <sys/mntent.h>
  35 #include <sys/autoconf.h>
  36
  37 #include <signal.h>
  38 #include <malloc.h>
  39 #include <unistd.h>
  40 #include <string.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <libgen.h>
  44 #include <sys/ioctl.h>
  45 #include <sys/fcntl.h>
  46 #include <sys/stat.h>
  47 #include <sys/swap.h>
  48 #include <sys/sysmacros.h>
  49 #include <sys/mkdev.h>
  50 #include <sys/modctl.h>
  51 #include <ctype.h>
  52 #include <libdiskmgt.h>
  53 #include <libnvpair.h>
  54 #include "misc.h"
  55 #include "checkdev.h"
  56 #include <sys/efi_partition.h>
  57
  58 /* Function prototypes */
  59 #ifdef  __STDC__
  60
  61 static struct   swaptable *getswapentries(void);
  62 static void     freeswapentries(struct swaptable *);
  63 static int      getpartition(char *pathname);
  64 static int      checkpartitions(int bm_mounted);
  65
  66 #else   /* __STDC__ */
  67
  68 static struct swaptable *getswapentries();
  69 static void freeswapentries();
  70 static int      getpartition();
  71 static int      checkpartitions();
  72
  73 #endif  /* __STDC__ */
  74
  75 extern char     *getfullname();
  76
  77 static struct swaptable *
  78 getswapentries(void)
  79 {
  80         register struct swaptable *st;
  81         register struct swapent *swapent;
  82         int     i, num;
  83         char    fullpathname[MAXPATHLEN];
  84
  85         /*
  86          * get the number of swap entries
  87          */
  88         if ((num = swapctl(SC_GETNSWP, (void *)NULL)) == -1) {
  89                 err_print("swapctl error ");
  90                 fullabort();
  91         }
  92         if (num == 0)
  93                 return (NULL);
  94         if ((st = (swaptbl_t *)malloc(num * sizeof (swapent_t) + sizeof (int)))
  95             == NULL) {
  96                 err_print("getswapentries: malloc  failed.\n");
  97                 fullabort();
  98         }
  99         swapent = st->swt_ent;
 100         for (i = 0; i < num; i++, swapent++) {
 101                 if ((swapent->ste_path = malloc(MAXPATHLEN)) == NULL) {
 102                         err_print("getswapentries: malloc  failed.\n");
 103                         fullabort();
 104                 }
 105         }
 106         st->swt_n = num;
 107         if ((num = swapctl(SC_LIST, (void *)st)) == -1) {
 108                 err_print("swapctl error ");
 109                 fullabort();
 110         }
 111         swapent = st->swt_ent;
 112         for (i = 0; i < num; i++, swapent++) {
 113                 if (*swapent->ste_path != '/') {
 114                         (void) snprintf(fullpathname, sizeof (fullpathname),
 115                             "/dev/%s", swapent->ste_path);
 116                         (void) strcpy(swapent->ste_path, fullpathname);
 117                 }
 118         }
 119         return (st);
 120 }
 121
 122 static void
 123 freeswapentries(st)
 124 struct swaptable *st;
 125 {
 126         register struct swapent *swapent;
 127         int i;
 128
 129         swapent = st->swt_ent;
 130         for (i = 0; i < st->swt_n; i++, swapent++)
 131                 free(swapent->ste_path);
 132         free(st);
 133
 134 }
 135
 136 /*
 137  *  function getpartition:
 138  */
 139 static int
 140 getpartition(pathname)
 141 char *pathname;
 142 {
 143         int             mfd;
 144         struct dk_cinfo dkinfo;
 145         struct stat     stbuf;
 146         char            raw_device[MAXPATHLEN];
 147         int             found = -1;
 148
 149         /*
 150          * Map the block device name to the raw device name.
 151          * If it doesn't appear to be a device name, skip it.
 152          */
 153         if (match_substr(pathname, "/dev/") == 0)
 154                 return (found);
 155         (void) strcpy(raw_device, "/dev/r");
 156         (void) strcat(raw_device, pathname + strlen("/dev/"));
 157         /*
 158          * Determine if this appears to be a disk device.
 159          * First attempt to open the device.  If if fails, skip it.
 160          */
 161         if ((mfd = open(raw_device, O_RDWR | O_NDELAY)) < 0) {
 162                 return (found);
 163         }
 164         /*
 165          * Must be a character device
 166          */
 167         if (fstat(mfd, &stbuf) == -1 || !S_ISCHR(stbuf.st_mode)) {
 168                 (void) close(mfd);
 169                 return (found);
 170         }
 171         /*
 172          * Attempt to read the configuration info on the disk.
 173          */
 174         if (ioctl(mfd, DKIOCINFO, &dkinfo) < 0) {
 175                 (void) close(mfd);
 176                 return (found);
 177         }
 178         /*
 179          * Finished with the opened device
 180          */
 181         (void) close(mfd);
 182
 183         /*
 184          * If it's not the disk we're interested in, it doesn't apply.
 185          */
 186         if (cur_disk->disk_dkinfo.dki_ctype != dkinfo.dki_ctype ||
 187                 cur_disk->disk_dkinfo.dki_cnum != dkinfo.dki_cnum ||
 188                 cur_disk->disk_dkinfo.dki_unit != dkinfo.dki_unit ||
 189                 strcmp(cur_disk->disk_dkinfo.dki_dname,
 190                                 dkinfo.dki_dname) != 0) {
 191                 return (found);
 192         }
 193
 194         /*
 195          *  Extract the partition that is mounted.
 196          */
 197         return (PARTITION(stbuf.st_rdev));
 198 }
 199
 200 /*
 201  * This Routine checks to see if there are partitions used for swapping overlaps
 202  * a given portion of a disk. If the start parameter is < 0, it means
 203  * that the entire disk should be checked
 204  */
 205 int
 206 checkswap(start, end)
 207         diskaddr_t start, end;
 208 {
 209         struct swaptable *st;
 210         struct swapent *swapent;
 211         int             i;
 212         int             found = 0;
 213         struct dk_map32 *map;
 214         int             part;
 215
 216         /*
 217          * If we are only checking part of the disk, the disk must
 218          * have a partition map to check against.  If it doesn't,
 219          * we hope for the best.
 220          */
 221         if (cur_parts == NULL)
 222                 return (0);
 223
 224         /*
 225          * check for swap entries
 226          */
 227         st = getswapentries();
 228         /*
 229          * if there are no swap entries return.
 230          */
 231         if (st == (struct swaptable *)NULL)
 232                 return (0);
 233         swapent = st->swt_ent;
 234         for (i = 0; i < st->swt_n; i++, swapent++) {
 235                 if ((part = getpartition(swapent->ste_path)) != -1) {
 236                         if (start == UINT_MAX64) {
 237                                 found = -1;
 238                                 break;
 239                         }
 240                         map = &cur_parts->pinfo_map[part];
 241                         if ((start >= (int)(map->dkl_cylno * spc() +
 242                                 map->dkl_nblk)) || (end < (int)(map->dkl_cylno
 243                                                         * spc()))) {
 244                                         continue;
 245                         }
 246                         found = -1;
 247                         break;
 248                 };
 249         }
 250         freeswapentries(st);
 251         /*
 252          * If we found trouble and we're running from a command file,
 253          * quit before doing something we really regret.
 254          */
 255
 256         if (found && option_f) {
 257                 err_print(
 258 "Operation on disks being used for swapping must be interactive.\n");
 259                 cmdabort(SIGINT);
 260         }
 261
 262         return (found);
 263
 264
 265 }
 266 /*
 267  * Determines if there are partitions that are a part of an SVM, VxVM, zpool
 268  * volume or a live upgrade device,  overlapping a given portion of a disk.
 269  * Mounts and swap devices are checked in legacy format code.
 270  */
 271 int
 272 checkdevinuse(char *cur_disk_path, diskaddr_t start, diskaddr_t end, int print,
 273         int check_label)
 274 {
 275
 276         int             error;
 277         int             found = 0;
 278         int             check = 0;
 279         int             i;
 280         int             bm_inuse = 0;
 281         int             part = 0;
 282         uint64_t        slice_start, slice_size;
 283         dm_descriptor_t *slices = NULL;
 284         nvlist_t        *attrs = NULL;
 285         char            *usage;
 286         char            *name;
 287
 288         /*
 289          * If the user does not want to do in use checking, return immediately.
 290          * Normally, this is handled in libdiskmgt. For format, there is more
 291          * processing required, so we want to bypass the in use checking
 292          * here.
 293          */
 294
 295         if (NOINUSE_SET)
 296                 return (0);
 297
 298         /*
 299          * Skip if it is not a real disk
 300          *
 301          * There could be two kinds of strings in cur_disk_path
 302          * One starts with c?t?d?, while the other is a absolute path of a
 303          * block device file.
 304          */
 305
 306         if (*cur_disk_path != 'c') {
 307                 struct  stat    stbuf;
 308                 char            majorname[16];
 309                 major_t         majornum;
 310
 311                 (void) stat(cur_disk_path, &stbuf);
 312                 majornum = major(stbuf.st_rdev);
 313                 (void) modctl(MODGETNAME, majorname, sizeof (majorname),
 314                     &majornum);
 315
 316                 if (strcmp(majorname, "sd"))
 317                         if (strcmp(majorname, "ssd"))
 318                                 if (strcmp(majorname, "cmdk"))
 319                                         return (0);
 320         }
 321
 322         /*
 323          * Truncate the characters following "d*", such as "s*" or "p*"
 324          */
 325         cur_disk_path = basename(cur_disk_path);
 326         name = strrchr(cur_disk_path, 'd');
 327         if (name) {
 328                 name++;
 329                 for (; (*name <= '9') && (*name >= '0'); name++) {
 330                 }
 331                 *name = (char)0;
 332         }
 333
 334
 335         /*
 336          * For format, we get basic 'in use' details from libdiskmgt. After
 337          * that we must do the appropriate checking to see if the 'in use'
 338          * details require a bit of additional work.
 339          */
 340
 341         dm_get_slices(cur_disk_path, &slices, &error);
 342         if (error) {
 343                 /*
 344                  * If ENODEV, it actually means the device is not in use.
 345                  * We will return 0 without displaying error.
 346                  */
 347                 if (error != ENODEV) {
 348                         err_print("Error occurred with device in use"
 349                             "checking: %s\n", strerror(error));
 350                         return (found);
 351                 }
 352         }
 353         if (slices == NULL)
 354                 return (found);
 355
 356         for (i = 0; slices[i] != NULL; i++) {
 357                 /*
 358                  * If we are checking the whole disk
 359                  * then any and all in use data is
 360                  * relevant.
 361                  */
 362                 if (start == UINT_MAX64) {
 363                         name = dm_get_name(slices[i], &error);
 364                         if (error != 0 || !name) {
 365                                 err_print("Error occurred with device "
 366                                     "in use checking: %s\n", strerror(error));
 367                                 continue;
 368                         }
 369                         if (dm_inuse(name, &usage, DM_WHO_FORMAT, &error) ||
 370                             error) {
 371                                 if (error != 0) {
 372                                         dm_free_name(name);
 373                                         name = NULL;
 374                                         err_print("Error occurred with "
 375                                             "device in use checking: "
 376                                             "%s\n", strerror(error));
 377                                         continue;
 378                                 }
 379                                 dm_free_name(name);
 380                                 name = NULL;
 381                                 /*
 382                                  * If this is a dump device, then it is
 383                                  * a failure. You cannot format a slice
 384                                  * that is a dedicated dump device.
 385                                  */
 386
 387                                 if (strstr(usage, DM_USE_DUMP)) {
 388                                         if (print) {
 389                                                 err_print(usage);
 390                                                 free(usage);
 391                                         }
 392                                         dm_free_descriptors(slices);
 393                                         return (1);
 394                                 }
 395                                 /*
 396                                  * We really found a device that is in use.
 397                                  * Set 'found' for the return value, and set
 398                                  * 'check' to indicate below that we must
 399                                  * get the partition number to set bm_inuse
 400                                  * in the event we are trying to label this
 401                                  * device. check_label is set when we are
 402                                  * checking modifications for in use slices
 403                                  * on the device.
 404                                  */
 405                                 found ++;
 406                                 check = 1;
 407                                 if (print) {
 408                                         err_print(usage);
 409                                         free(usage);
 410                                 }
 411                         }
 412                 } else {
 413                         /*
 414                          * Before getting the in use data, verify that the
 415                          * current slice is within the range we are checking.
 416                          */
 417                         attrs = dm_get_attributes(slices[i], &error);
 418                         if (error) {
 419                                 err_print("Error occurred with device in use "
 420                                     "checking: %s\n", strerror(error));
 421                                 continue;
 422                         }
 423                         if (attrs == NULL) {
 424                                 continue;
 425                         }
 426
 427                         (void) nvlist_lookup_uint64(attrs, DM_START,
 428                             &slice_start);
 429                         (void) nvlist_lookup_uint64(attrs, DM_SIZE,
 430                             &slice_size);
 431                         if (start >= (slice_start + slice_size) ||
 432                             (end < slice_start)) {
 433                                 nvlist_free(attrs);
 434                                 attrs = NULL;
 435                                 continue;
 436                         }
 437                         name = dm_get_name(slices[i], &error);
 438                         if (error != 0 || !name) {
 439                                 err_print("Error occurred with device "
 440                                     "in use checking: %s\n", strerror(error));
 441                                 nvlist_free(attrs);
 442                                 attrs = NULL;
 443                                 continue;
 444                         }
 445                         if (dm_inuse(name, &usage,
 446                             DM_WHO_FORMAT, &error) || error) {
 447                                 if (error != 0) {
 448                                         dm_free_name(name);
 449                                         name = NULL;
 450                                         err_print("Error occurred with "
 451                                             "device in use checking: "
 452                                             "%s\n", strerror(error));
 453                                         nvlist_free(attrs);
 454                                         attrs = NULL;
 455                                         continue;
 456                                 }
 457                                 dm_free_name(name);
 458                                 name = NULL;
 459                                 /*
 460                                  * If this is a dump device, then it is
 461                                  * a failure. You cannot format a slice
 462                                  * that is a dedicated dump device.
 463                                  */
 464                                 if (strstr(usage, DM_USE_DUMP)) {
 465                                         if (print) {
 466                                                 err_print(usage);
 467                                                 free(usage);
 468                                         }
 469                                         dm_free_descriptors(slices);
 470                                         nvlist_free(attrs);
 471                                         return (1);
 472                                 }
 473                                 /*
 474                                  * We really found a device that is in use.
 475                                  * Set 'found' for the return value, and set
 476                                  * 'check' to indicate below that we must
 477                                  * get the partition number to set bm_inuse
 478                                  * in the event we are trying to label this
 479                                  * device. check_label is set when we are
 480                                  * checking modifications for in use slices
 481                                  * on the device.
 482                                  */
 483                                 found ++;
 484                                 check = 1;
 485                                 if (print) {
 486                                         err_print(usage);
 487                                         free(usage);
 488                                 }
 489                         }
 490                 }
 491                 /*
 492                  * If check is set it means we found a slice(the current slice)
 493                  * on this device in use in some way.  We potentially want
 494                  * to check this slice when labeling is
 495                  * requested. We set bm_inuse with this partition value
 496                  * for use later if check_label was set when called.
 497                  */
 498                 if (check) {
 499                         name = dm_get_name(slices[i], &error);
 500                         if (error != 0 || !name) {
 501                                 err_print("Error occurred with device "
 502                                     "in use checking: %s\n", strerror(error));
 503                                 nvlist_free(attrs);
 504                                 attrs = NULL;
 505                                 continue;
 506                         }
 507                         part = getpartition(name);
 508                         dm_free_name(name);
 509                         name = NULL;
 510                         if (part != -1) {
 511                                 bm_inuse |= 1 << part;
 512                         }
 513                         check = 0;
 514                 }
 515                 /*
 516                  * If we have attributes then we have successfully
 517                  * found the slice we were looking for and we also
 518                  * know this means we are not searching the whole
 519                  * disk so break out of the loop
 520                  * now.
 521                  */
 522                 if (attrs) {
 523                         nvlist_free(attrs);
 524                         break;
 525                 }
 526         }
 527
 528         if (slices) {
 529                 dm_free_descriptors(slices);
 530         }
 531
 532         /*
 533          * The user is trying to label the disk. We have to do special
 534          * checking here to ensure they are not trying to modify a slice
 535          * that is in use in an incompatible way.
 536          */
 537         if (check_label && bm_inuse) {
 538                 /*
 539                  * !0 indicates that we found a
 540                  * problem. In this case, we have overloaded
 541                  * the use of checkpartitions to work for
 542                  * in use devices. bm_inuse is representative
 543                  * of the slice that is in use, not that
 544                  * is mounted as is in the case of the normal
 545                  * use of checkpartitions.
 546                  *
 547                  * The call to checkpartitions will return !0 if
 548                  * we are trying to shrink a device that we have found
 549                  * to be in use above.
 550                  */
 551                 return (checkpartitions(bm_inuse));
 552         }
 553
 554         return (found);
 555 }
 556 /*
 557  * This routine checks to see if there are mounted partitions overlapping
 558  * a given portion of a disk.  If the start parameter is < 0, it means
 559  * that the entire disk should be checked.
 560  */
 561 int
 562 checkmount(start, end)
 563         diskaddr_t      start, end;
 564 {
 565         FILE            *fp;
 566         int             found = 0;
 567         struct dk_map32 *map;
 568         int             part;
 569         struct mnttab   mnt_record;
 570         struct mnttab   *mp = &mnt_record;
 571
 572         /*
 573          * If we are only checking part of the disk, the disk must
 574          * have a partition map to check against.  If it doesn't,
 575          * we hope for the best.
 576          */
 577         if (cur_parts == NULL)
 578                 return (0);
 579
 580         /*
 581          * Lock out interrupts because of the mntent protocol.
 582          */
 583         enter_critical();
 584         /*
 585          * Open the mount table.
 586          */
 587         fp = fopen(MNTTAB, "r");
 588         if (fp == NULL) {
 589                 err_print("Unable to open mount table.\n");
 590                 fullabort();
 591         }
 592         /*
 593          * Loop through the mount table until we run out of entries.
 594          */
 595         while ((getmntent(fp, mp)) != -1) {
 596
 597                 if ((part = getpartition(mp->mnt_special)) == -1)
 598                         continue;
 599
 600                 /*
 601                  * It's a mount on the disk we're checking.  If we are
 602                  * checking whole disk, then we found trouble.  We can
 603                  * quit searching.
 604                  */
 605                 if (start == UINT_MAX64) {
 606                         found = -1;
 607                         break;
 608                 }
 609
 610                 /*
 611                  * If the partition overlaps the zone we're checking,
 612                  * then we found trouble.  We can quit searching.
 613                  */
 614                 map = &cur_parts->pinfo_map[part];
 615                 if ((start >= (int)(map->dkl_cylno * spc() + map->dkl_nblk)) ||
 616                         (end < (int)(map->dkl_cylno * spc()))) {
 617                         continue;
 618                 }
 619                 found = -1;
 620                 break;
 621         }
 622         /*
 623          * Close down the mount table.
 624          */
 625         (void) fclose(fp);
 626         exit_critical();
 627
 628         /*
 629          * If we found trouble and we're running from a command file,
 630          * quit before doing something we really regret.
 631          */
 632
 633         if (found && option_f) {
 634                 err_print("Operation on mounted disks must be interactive.\n");
 635                 cmdabort(SIGINT);
 636         }
 637         /*
 638          * Return the result.
 639          */
 640         return (found);
 641 }
 642
 643 int
 644 check_label_with_swap()
 645 {
 646         int                     i;
 647         struct swaptable *st;
 648         struct swapent *swapent;
 649         int     part;
 650         int     bm_swap = 0;
 651
 652         /*
 653          * If we are only checking part of the disk, the disk must
 654          * have a partition map to check against.  If it doesn't,
 655          * we hope for the best.
 656          */
 657         if (cur_parts == NULL)
 658                 return (0);     /* Will be checked later */
 659
 660         /*
 661          * Check for swap entries
 662          */
 663         st = getswapentries();
 664         /*
 665          * if there are no swap entries return.
 666          */
 667         if (st == (struct swaptable *)NULL)
 668                 return (0);
 669         swapent = st->swt_ent;
 670         for (i = 0; i < st->swt_n; i++, swapent++)
 671                 if ((part = getpartition(swapent->ste_path)) != -1)
 672                                 bm_swap |= (1 << part);
 673         freeswapentries(st);
 674
 675         return (checkpartitions(bm_swap));
 676 }
 677
 678 /*
 679  * Check the new label with the existing label on the disk,
 680  * to make sure that any mounted partitions are not being
 681  * affected by writing the new label.
 682  */
 683 int
 684 check_label_with_mount()
 685 {
 686         FILE                    *fp;
 687         int                     part;
 688         struct mnttab           mnt_record;
 689         struct mnttab           *mp = &mnt_record;
 690         int                     bm_mounted = 0;
 691
 692
 693         /*
 694          * If we are only checking part of the disk, the disk must
 695          * have a partition map to check against.  If it doesn't,
 696          * we hope for the best.
 697          */
 698         if (cur_parts == NULL)
 699                 return (0);     /* Will be checked later */
 700
 701         /*
 702          * Lock out interrupts because of the mntent protocol.
 703          */
 704         enter_critical();
 705         /*
 706          * Open the mount table.
 707          */
 708         fp = fopen(MNTTAB, "r");
 709         if (fp == NULL) {
 710                 err_print("Unable to open mount table.\n");
 711                 fullabort();
 712         }
 713         /*
 714          * Loop through the mount table until we run out of entries.
 715          */
 716         while ((getmntent(fp, mp)) != -1) {
 717                 if ((part = getpartition(mp->mnt_special)) != -1)
 718                         bm_mounted |= (1 << part);
 719         }
 720         /*
 721          * Close down the mount table.
 722          */
 723         (void) fclose(fp);
 724         exit_critical();
 725
 726         return (checkpartitions(bm_mounted));
 727
 728 }
 729
 730 /*
 731  * This Routine checks if any partitions specified
 732  * are affected by writing the new label
 733  */
 734 static int
 735 checkpartitions(int bm_mounted)
 736 {
 737         struct dk_map32         *n;
 738         struct dk_map           *o;
 739         struct dk_allmap        old_map;
 740         int                     i, found = 0;
 741         struct partition64      o_efi;
 742
 743         /*
 744          * Now we need to check that the current partition list and the
 745          * previous partition list (which there must be if we actually
 746          * have partitions mounted) overlap  in any way on the mounted
 747          * partitions
 748          */
 749
 750         /*
 751          * Check if the user wants to online-label an
 752          * existing EFI label.
 753          */
 754         if (cur_label == L_TYPE_EFI) {
 755                 for (i = 0; i < EFI_NUMPAR; i++) {
 756                         if (bm_mounted & (1 << i)) {
 757                                 o_efi.p_partno = i;
 758                                 if (ioctl(cur_file, DKIOCPARTITION, &o_efi)
 759                                     == -1) {
 760                                         err_print("Unable to get information "
 761                                             "for EFI partition %d.\n", i);
 762                                         return (-1);
 763                                 }
 764
 765                                 /*
 766                                  * Partition can grow or remain same.
 767                                  */
 768                                 if (o_efi.p_start == cur_parts->etoc->
 769                                     efi_parts[i].p_start && o_efi.p_size
 770                                     <= cur_parts->etoc->efi_parts[i].p_size) {
 771                                         continue;
 772                                 }
 773
 774                                 found = -1;
 775                         }
 776                         if (found)
 777                                 break;
 778                 }
 779
 780         } else {
 781
 782                 /*
 783                  * Get the "real" (on-disk) version of the partition table
 784                  */
 785                 if (ioctl(cur_file, DKIOCGAPART, &old_map) == -1) {
 786                         err_print("Unable to get current partition map.\n");
 787                         return (-1);
 788                 }
 789                 for (i = 0; i < NDKMAP; i++) {
 790                         if (bm_mounted & (1 << i)) {
 791                                 /*
 792                                  * This partition is mounted
 793                                  */
 794                                 o = &old_map.dka_map[i];
 795                                 n = &cur_parts->pinfo_map[i];
 796 #ifdef DEBUG
 797                                 fmt_print(
 798 "checkpartitions :checking partition '%c' \n", i + PARTITION_BASE);
 799 #endif
 800                                 /*
 801                                  * If partition is identical, we're fine.
 802                                  * If the partition grows, we're also fine,
 803                                  * because the routines in partition.c check
 804                                  * for overflow. It will (ultimately) be up
 805                                  * to the routines in partition.c to warn
 806                                  * about creation of overlapping partitions.
 807                                  */
 808                                 if (o->dkl_cylno == n->dkl_cylno &&
 809                                     o->dkl_nblk <= n->dkl_nblk) {
 810 #ifdef  DEBUG
 811                                         if (o->dkl_nblk < n->dkl_nblk) {
 812                                                 fmt_print(
 813 "- new partition larger by %d blocks", n->dkl_nblk-o->dkl_nblk);
 814                                         }
 815                                         fmt_print("\n");
 816 #endif
 817                                         continue;
 818                                 }
 819 #ifdef DEBUG
 820                                 fmt_print("- changes; old (%d,%d)->new "
 821 "(%d,%d)\n", o->dkl_cylno, o->dkl_nblk, n->dkl_cylno, n->dkl_nblk);
 822 #endif
 823                                 found = -1;
 824                         }
 825                         if (found)
 826                                 break;
 827                 }
 828         }
 829
 830         /*
 831          * If we found trouble and we're running from a command file,
 832          * quit before doing something we really regret.
 833          */
 834
 835         if (found && option_f) {
 836                 err_print("Operation on mounted disks or \
 837 disks currently being used for swapping must be interactive.\n");
 838                 cmdabort(SIGINT);
 839         }
 840         /*
 841          * Return the result.
 842          */
 843         return (found);
 844 }