sbin/fsck_ffs/pass5.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1980, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if 0
  33 #ifndef lint
  34 static const char sccsid[] = "@(#)pass5.c       8.9 (Berkeley) 4/28/95";
  35 #endif /* not lint */
  36 #endif
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include <sys/param.h>
  41 #include <sys/sysctl.h>
  42
  43 #include <ufs/ufs/dinode.h>
  44 #include <ufs/ffs/fs.h>
  45
  46 #include <err.h>
  47 #include <inttypes.h>
  48 #include <limits.h>
  49 #include <string.h>
  50 #include <libufs.h>
  51
  52 #include "fsck.h"
  53
  54 static void check_maps(u_char *, u_char *, int, ufs2_daddr_t, const char *,
  55                         int *, int, int, int);
  56 static void clear_blocks(ufs2_daddr_t start, ufs2_daddr_t end);
  57
  58 void
  59 pass5(void)
  60 {
  61         int c, i, j, blk, frags, basesize, mapsize;
  62         int inomapsize, blkmapsize;
  63         struct fs *fs = &sblock;
  64         ufs2_daddr_t d, dbase, dmax, start;
  65         int rewritecg = 0;
  66         ino_t inum;
  67         struct csum *cs;
  68         struct csum_total cstotal;
  69         struct inodesc idesc[3];
  70         char buf[MAXBSIZE];
  71         struct cg *cg, *newcg = (struct cg *)buf;
  72         struct bufarea *cgbp;
  73
  74         inoinfo(UFS_WINO)->ino_state = USTATE;
  75         memset(newcg, 0, (size_t)fs->fs_cgsize);
  76         newcg->cg_niblk = fs->fs_ipg;
  77         /* check to see if we are to add a cylinder group check hash */
  78         if ((ckhashadd & CK_CYLGRP) != 0) {
  79                 fs->fs_metackhash |= CK_CYLGRP;
  80                 rewritecg = 1;
  81                 sbdirty();
  82         }
  83         if (cvtlevel >= 3) {
  84                 if (fs->fs_maxcontig < 2 && fs->fs_contigsumsize > 0) {
  85                         if (preen)
  86                                 pwarn("DELETING CLUSTERING MAPS\n");
  87                         if (preen || reply("DELETE CLUSTERING MAPS")) {
  88                                 fs->fs_contigsumsize = 0;
  89                                 rewritecg = 1;
  90                                 sbdirty();
  91                         }
  92                 }
  93                 if (fs->fs_maxcontig > 1) {
  94                         const char *doit = NULL;
  95
  96                         if (fs->fs_contigsumsize < 1) {
  97                                 doit = "CREAT";
  98                         } else if (fs->fs_contigsumsize < fs->fs_maxcontig &&
  99                                    fs->fs_contigsumsize < FS_MAXCONTIG) {
 100                                 doit = "EXPAND";
 101                         }
 102                         if (doit) {
 103                                 i = fs->fs_contigsumsize;
 104                                 fs->fs_contigsumsize =
 105                                     MIN(fs->fs_maxcontig, FS_MAXCONTIG);
 106                                 if (CGSIZE(fs) > (u_int)fs->fs_bsize) {
 107                                         pwarn("CANNOT %s CLUSTER MAPS\n", doit);
 108                                         fs->fs_contigsumsize = i;
 109                                 } else if (preen ||
 110                                     reply("CREATE CLUSTER MAPS")) {
 111                                         if (preen)
 112                                                 pwarn("%sING CLUSTER MAPS\n",
 113                                                     doit);
 114                                         fs->fs_cgsize =
 115                                             fragroundup(fs, CGSIZE(fs));
 116                                         rewritecg = 1;
 117                                         sbdirty();
 118                                 }
 119                         }
 120                 }
 121         }
 122         basesize = &newcg->cg_space[0] - (u_char *)(&newcg->cg_firstfield);
 123         if (sblock.fs_magic == FS_UFS2_MAGIC) {
 124                 newcg->cg_iusedoff = basesize;
 125         } else {
 126                 /*
 127                  * We reserve the space for the old rotation summary
 128                  * tables for the benefit of old kernels, but do not
 129                  * maintain them in modern kernels. In time, they can
 130                  * go away.
 131                  */
 132                 newcg->cg_old_btotoff = basesize;
 133                 newcg->cg_old_boff = newcg->cg_old_btotoff +
 134                     fs->fs_old_cpg * sizeof(int32_t);
 135                 newcg->cg_iusedoff = newcg->cg_old_boff +
 136                     fs->fs_old_cpg * fs->fs_old_nrpos * sizeof(u_int16_t);
 137                 memset(&newcg->cg_space[0], 0, newcg->cg_iusedoff - basesize);
 138         }
 139         inomapsize = howmany(fs->fs_ipg, CHAR_BIT);
 140         newcg->cg_freeoff = newcg->cg_iusedoff + inomapsize;
 141         blkmapsize = howmany(fs->fs_fpg, CHAR_BIT);
 142         newcg->cg_nextfreeoff = newcg->cg_freeoff + blkmapsize;
 143         if (fs->fs_contigsumsize > 0) {
 144                 newcg->cg_clustersumoff = newcg->cg_nextfreeoff -
 145                     sizeof(u_int32_t);
 146                 newcg->cg_clustersumoff =
 147                     roundup(newcg->cg_clustersumoff, sizeof(u_int32_t));
 148                 newcg->cg_clusteroff = newcg->cg_clustersumoff +
 149                     (fs->fs_contigsumsize + 1) * sizeof(u_int32_t);
 150                 newcg->cg_nextfreeoff = newcg->cg_clusteroff +
 151                     howmany(fragstoblks(fs, fs->fs_fpg), CHAR_BIT);
 152         }
 153         newcg->cg_magic = CG_MAGIC;
 154         mapsize = newcg->cg_nextfreeoff - newcg->cg_iusedoff;
 155         memset(&idesc[0], 0, sizeof idesc);
 156         for (i = 0; i < 3; i++)
 157                 idesc[i].id_type = ADDR;
 158         memset(&cstotal, 0, sizeof(struct csum_total));
 159         dmax = blknum(fs, fs->fs_size + fs->fs_frag - 1);
 160         for (d = fs->fs_size; d < dmax; d++)
 161                 setbmap(d);
 162         for (c = 0; c < fs->fs_ncg; c++) {
 163                 if (got_siginfo) {
 164                         printf("%s: phase 5: cyl group %d of %d (%d%%)\n",
 165                             cdevname, c, sblock.fs_ncg,
 166                             c * 100 / sblock.fs_ncg);
 167                         got_siginfo = 0;
 168                 }
 169                 if (got_sigalarm) {
 170                         setproctitle("%s p5 %d%%", cdevname,
 171                             c * 100 / sblock.fs_ncg);
 172                         got_sigalarm = 0;
 173                 }
 174                 cgbp = cglookup(c);
 175                 cg = cgbp->b_un.b_cg;
 176                 if (!cg_chkmagic(cg))
 177                         pfatal("CG %d: BAD MAGIC NUMBER\n", c);
 178                 /*
 179                  * If we have a cylinder group check hash and are not adding
 180                  * it for the first time, verify that it is good.
 181                  */
 182                 if ((fs->fs_metackhash & CK_CYLGRP) != 0 &&
 183                     (ckhashadd & CK_CYLGRP) == 0) {
 184                         uint32_t ckhash, thishash;
 185
 186                         ckhash = cg->cg_ckhash;
 187                         cg->cg_ckhash = 0;
 188                         thishash = calculate_crc32c(~0L, cg, fs->fs_cgsize);
 189                         if (ckhash != thishash)
 190                                 pwarn("CG %d: BAD CHECK-HASH %#x vs %#x\n",
 191                                     c, ckhash, thishash);
 192                         cg->cg_ckhash = ckhash;
 193                 }
 194                 newcg->cg_time = cg->cg_time;
 195                 newcg->cg_old_time = cg->cg_old_time;
 196                 newcg->cg_unrefs = cg->cg_unrefs;
 197                 newcg->cg_cgx = c;
 198                 dbase = cgbase(fs, c);
 199                 dmax = dbase + fs->fs_fpg;
 200                 if (dmax > fs->fs_size)
 201                         dmax = fs->fs_size;
 202                 newcg->cg_ndblk = dmax - dbase;
 203                 if (fs->fs_magic == FS_UFS1_MAGIC) {
 204                         if (c == fs->fs_ncg - 1)
 205                                 newcg->cg_old_ncyl = howmany(newcg->cg_ndblk,
 206                                     fs->fs_fpg / fs->fs_old_cpg);
 207                         else
 208                                 newcg->cg_old_ncyl = fs->fs_old_cpg;
 209                         newcg->cg_old_niblk = fs->fs_ipg;
 210                         newcg->cg_niblk = 0;
 211                 }
 212                 if (fs->fs_contigsumsize > 0)
 213                         newcg->cg_nclusterblks = newcg->cg_ndblk / fs->fs_frag;
 214                 newcg->cg_cs.cs_ndir = 0;
 215                 newcg->cg_cs.cs_nffree = 0;
 216                 newcg->cg_cs.cs_nbfree = 0;
 217                 newcg->cg_cs.cs_nifree = fs->fs_ipg;
 218                 if (cg->cg_rotor >= 0 && cg->cg_rotor < newcg->cg_ndblk)
 219                         newcg->cg_rotor = cg->cg_rotor;
 220                 else
 221                         newcg->cg_rotor = 0;
 222                 if (cg->cg_frotor >= 0 && cg->cg_frotor < newcg->cg_ndblk)
 223                         newcg->cg_frotor = cg->cg_frotor;
 224                 else
 225                         newcg->cg_frotor = 0;
 226                 if (cg->cg_irotor >= 0 && cg->cg_irotor < fs->fs_ipg)
 227                         newcg->cg_irotor = cg->cg_irotor;
 228                 else
 229                         newcg->cg_irotor = 0;
 230                 if (fs->fs_magic == FS_UFS1_MAGIC) {
 231                         newcg->cg_initediblk = 0;
 232                 } else {
 233                         if ((unsigned)cg->cg_initediblk > fs->fs_ipg)
 234                                 newcg->cg_initediblk = fs->fs_ipg;
 235                         else
 236                                 newcg->cg_initediblk = cg->cg_initediblk;
 237                 }
 238                 memset(&newcg->cg_frsum[0], 0, sizeof newcg->cg_frsum);
 239                 memset(cg_inosused(newcg), 0, (size_t)(mapsize));
 240                 inum = fs->fs_ipg * c;
 241                 for (i = 0; i < inostathead[c].il_numalloced; inum++, i++) {
 242                         switch (inoinfo(inum)->ino_state) {
 243
 244                         case USTATE:
 245                                 break;
 246
 247                         case DSTATE:
 248                         case DCLEAR:
 249                         case DFOUND:
 250                         case DZLINK:
 251                                 newcg->cg_cs.cs_ndir++;
 252                                 /* FALLTHROUGH */
 253
 254                         case FSTATE:
 255                         case FCLEAR:
 256                         case FZLINK:
 257                                 newcg->cg_cs.cs_nifree--;
 258                                 setbit(cg_inosused(newcg), i);
 259                                 break;
 260
 261                         default:
 262                                 if (inum < UFS_ROOTINO)
 263                                         break;
 264                                 errx(EEXIT, "BAD STATE %d FOR INODE I=%ju",
 265                                     inoinfo(inum)->ino_state, (uintmax_t)inum);
 266                         }
 267                 }
 268                 if (c == 0)
 269                         for (i = 0; i < (int)UFS_ROOTINO; i++) {
 270                                 setbit(cg_inosused(newcg), i);
 271                                 newcg->cg_cs.cs_nifree--;
 272                         }
 273                 start = -1;
 274                 for (i = 0, d = dbase;
 275                      d < dmax;
 276                      d += fs->fs_frag, i += fs->fs_frag) {
 277                         frags = 0;
 278                         for (j = 0; j < fs->fs_frag; j++) {
 279                                 if (testbmap(d + j)) {
 280                                         if ((Eflag || Zflag) && start != -1) {
 281                                                 clear_blocks(start, d + j - 1);
 282                                                 start = -1;
 283                                         }
 284                                         continue;
 285                                 }
 286                                 if (start == -1)
 287                                         start = d + j;
 288                                 setbit(cg_blksfree(newcg), i + j);
 289                                 frags++;
 290                         }
 291                         if (frags == fs->fs_frag) {
 292                                 newcg->cg_cs.cs_nbfree++;
 293                                 if (fs->fs_contigsumsize > 0)
 294                                         setbit(cg_clustersfree(newcg),
 295                                             i / fs->fs_frag);
 296                         } else if (frags > 0) {
 297                                 newcg->cg_cs.cs_nffree += frags;
 298                                 blk = blkmap(fs, cg_blksfree(newcg), i);
 299                                 ffs_fragacct(fs, blk, newcg->cg_frsum, 1);
 300                         }
 301                 }
 302                 if ((Eflag || Zflag) && start != -1)
 303                         clear_blocks(start, d - 1);
 304                 if (fs->fs_contigsumsize > 0) {
 305                         int32_t *sump = cg_clustersum(newcg);
 306                         u_char *mapp = cg_clustersfree(newcg);
 307                         int map = *mapp++;
 308                         int bit = 1;
 309                         int run = 0;
 310
 311                         for (i = 0; i < newcg->cg_nclusterblks; i++) {
 312                                 if ((map & bit) != 0) {
 313                                         run++;
 314                                 } else if (run != 0) {
 315                                         if (run > fs->fs_contigsumsize)
 316                                                 run = fs->fs_contigsumsize;
 317                                         sump[run]++;
 318                                         run = 0;
 319                                 }
 320                                 if ((i & (CHAR_BIT - 1)) != (CHAR_BIT - 1)) {
 321                                         bit <<= 1;
 322                                 } else {
 323                                         map = *mapp++;
 324                                         bit = 1;
 325                                 }
 326                         }
 327                         if (run != 0) {
 328                                 if (run > fs->fs_contigsumsize)
 329                                         run = fs->fs_contigsumsize;
 330                                 sump[run]++;
 331                         }
 332                 }
 333                 if ((fs->fs_metackhash & CK_CYLGRP) != 0) {
 334                         newcg->cg_ckhash = 0;
 335                         newcg->cg_ckhash =
 336                             calculate_crc32c(~0L, (void *)newcg, fs->fs_cgsize);
 337                 }
 338
 339                 if (bkgrdflag != 0) {
 340                         cstotal.cs_nffree += cg->cg_cs.cs_nffree;
 341                         cstotal.cs_nbfree += cg->cg_cs.cs_nbfree;
 342                         cstotal.cs_nifree += cg->cg_cs.cs_nifree;
 343                         cstotal.cs_ndir += cg->cg_cs.cs_ndir;
 344                 } else {
 345                         cstotal.cs_nffree += newcg->cg_cs.cs_nffree;
 346                         cstotal.cs_nbfree += newcg->cg_cs.cs_nbfree;
 347                         cstotal.cs_nifree += newcg->cg_cs.cs_nifree;
 348                         cstotal.cs_ndir += newcg->cg_cs.cs_ndir;
 349                 }
 350                 cs = &fs->fs_cs(fs, c);
 351                 if (cursnapshot == 0 &&
 352                     memcmp(&newcg->cg_cs, cs, sizeof *cs) != 0 &&
 353                     dofix(&idesc[0], "FREE BLK COUNT(S) WRONG IN SUPERBLK")) {
 354                         memmove(cs, &newcg->cg_cs, sizeof *cs);
 355                         sbdirty();
 356                 }
 357                 if (rewritecg) {
 358                         memmove(cg, newcg, (size_t)fs->fs_cgsize);
 359                         dirty(cgbp);
 360                         continue;
 361                 }
 362                 if (cursnapshot == 0 &&
 363                     memcmp(newcg, cg, basesize) != 0 &&
 364                     dofix(&idesc[2], "SUMMARY INFORMATION BAD")) {
 365                         memmove(cg, newcg, (size_t)basesize);
 366                         dirty(cgbp);
 367                 }
 368                 if (bkgrdflag != 0 || usedsoftdep || debug)
 369                         update_maps(cg, newcg, bkgrdflag);
 370                 if (cursnapshot == 0 &&
 371                     memcmp(cg_inosused(newcg), cg_inosused(cg), mapsize) != 0 &&
 372                     dofix(&idesc[1], "BLK(S) MISSING IN BIT MAPS")) {
 373                         memmove(cg_inosused(cg), cg_inosused(newcg),
 374                               (size_t)mapsize);
 375                         dirty(cgbp);
 376                 }
 377         }
 378         if (cursnapshot == 0 &&
 379             memcmp(&cstotal, &fs->fs_cstotal, sizeof cstotal) != 0
 380             && dofix(&idesc[0], "SUMMARY BLK COUNT(S) WRONG IN SUPERBLK")) {
 381                 memmove(&fs->fs_cstotal, &cstotal, sizeof cstotal);
 382                 fs->fs_ronly = 0;
 383                 fs->fs_fmod = 0;
 384                 sbdirty();
 385         }
 386
 387         /*
 388          * When doing background fsck on a snapshot, figure out whether
 389          * the superblock summary is inaccurate and correct it when
 390          * necessary.
 391          */
 392         if (cursnapshot != 0) {
 393                 cmd.size = 1;
 394
 395                 cmd.value = cstotal.cs_ndir - fs->fs_cstotal.cs_ndir;
 396                 if (cmd.value != 0) {
 397                         if (debug)
 398                                 printf("adjndir by %+" PRIi64 "\n", cmd.value);
 399                         if (bkgrdsumadj == 0 || sysctl(adjndir, MIBSIZE, 0, 0,
 400                             &cmd, sizeof cmd) == -1)
 401                                 rwerror("ADJUST NUMBER OF DIRECTORIES", cmd.value);
 402                 }
 403
 404                 cmd.value = cstotal.cs_nbfree - fs->fs_cstotal.cs_nbfree;
 405                 if (cmd.value != 0) {
 406                         if (debug)
 407                                 printf("adjnbfree by %+" PRIi64 "\n", cmd.value);
 408                         if (bkgrdsumadj == 0 || sysctl(adjnbfree, MIBSIZE, 0, 0,
 409                             &cmd, sizeof cmd) == -1)
 410                                 rwerror("ADJUST NUMBER OF FREE BLOCKS", cmd.value);
 411                 }
 412
 413                 cmd.value = cstotal.cs_nifree - fs->fs_cstotal.cs_nifree;
 414                 if (cmd.value != 0) {
 415                         if (debug)
 416                                 printf("adjnifree by %+" PRIi64 "\n", cmd.value);
 417                         if (bkgrdsumadj == 0 || sysctl(adjnifree, MIBSIZE, 0, 0,
 418                             &cmd, sizeof cmd) == -1)
 419                                 rwerror("ADJUST NUMBER OF FREE INODES", cmd.value);
 420                 }
 421
 422                 cmd.value = cstotal.cs_nffree - fs->fs_cstotal.cs_nffree;
 423                 if (cmd.value != 0) {
 424                         if (debug)
 425                                 printf("adjnffree by %+" PRIi64 "\n", cmd.value);
 426                         if (bkgrdsumadj == 0 || sysctl(adjnffree, MIBSIZE, 0, 0,
 427                             &cmd, sizeof cmd) == -1)
 428                                 rwerror("ADJUST NUMBER OF FREE FRAGS", cmd.value);
 429                 }
 430
 431                 cmd.value = cstotal.cs_numclusters - fs->fs_cstotal.cs_numclusters;
 432                 if (cmd.value != 0) {
 433                         if (debug)
 434                                 printf("adjnumclusters by %+" PRIi64 "\n", cmd.value);
 435                         if (bkgrdsumadj == 0 || sysctl(adjnumclusters, MIBSIZE, 0, 0,
 436                             &cmd, sizeof cmd) == -1)
 437                                 rwerror("ADJUST NUMBER OF FREE CLUSTERS", cmd.value);
 438                 }
 439         }
 440 }
 441
 442 /*
 443  * Compare the original cylinder group inode and block bitmaps with the
 444  * updated cylinder group inode and block bitmaps. Free inodes and blocks
 445  * that have been added. Complain if any previously freed inodes blocks
 446  * are now allocated.
 447  */
 448 void
 449 update_maps(
 450         struct cg *oldcg,       /* cylinder group of claimed allocations */
 451         struct cg *newcg,       /* cylinder group of determined allocations */
 452         int usesysctl)          /* 1 => use sysctl interface to update maps */
 453 {
 454         int inomapsize, excessdirs;
 455         struct fs *fs = &sblock;
 456
 457         inomapsize = howmany(fs->fs_ipg, CHAR_BIT);
 458         excessdirs = oldcg->cg_cs.cs_ndir - newcg->cg_cs.cs_ndir;
 459         if (excessdirs < 0) {
 460                 pfatal("LOST %d DIRECTORIES\n", -excessdirs);
 461                 excessdirs = 0;
 462         }
 463         if (excessdirs > 0)
 464                 check_maps(cg_inosused(newcg), cg_inosused(oldcg), inomapsize,
 465                     oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_ipg, "DIR", freedirs,
 466                     0, excessdirs, usesysctl);
 467         check_maps(cg_inosused(newcg), cg_inosused(oldcg), inomapsize,
 468             oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_ipg, "FILE", freefiles,
 469             excessdirs, fs->fs_ipg, usesysctl);
 470         check_maps(cg_blksfree(oldcg), cg_blksfree(newcg),
 471             howmany(fs->fs_fpg, CHAR_BIT),
 472             oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_fpg, "FRAG",
 473             freeblks, 0, fs->fs_fpg, usesysctl);
 474 }
 475
 476 static void
 477 check_maps(
 478         u_char *map1,   /* map of claimed allocations */
 479         u_char *map2,   /* map of determined allocations */
 480         int mapsize,    /* size of above two maps */
 481         ufs2_daddr_t startvalue, /* resource value for first element in map */
 482         const char *name,       /* name of resource found in maps */
 483         int *opcode,    /* sysctl opcode to free resource */
 484         int skip,       /* number of entries to skip before starting to free */
 485         int limit,      /* limit on number of entries to free */
 486         int usesysctl)  /* 1 => use sysctl interface to update maps */
 487 {
 488 #       define BUFSIZE 16
 489         char buf[BUFSIZE];
 490         long i, j, k, l, m, size;
 491         ufs2_daddr_t n, astart, aend, ustart, uend;
 492         void (*msg)(const char *fmt, ...);
 493
 494         if (usesysctl)
 495                 msg = pfatal;
 496         else
 497                 msg = pwarn;
 498         astart = ustart = aend = uend = -1;
 499         for (i = 0; i < mapsize; i++) {
 500                 j = *map1++;
 501                 k = *map2++;
 502                 if (j == k)
 503                         continue;
 504                 for (m = 0, l = 1; m < CHAR_BIT; m++, l <<= 1) {
 505                         if ((j & l) == (k & l))
 506                                 continue;
 507                         n = startvalue + i * CHAR_BIT + m;
 508                         if ((j & l) != 0) {
 509                                 if (astart == -1) {
 510                                         astart = aend = n;
 511                                         continue;
 512                                 }
 513                                 if (aend + 1 == n) {
 514                                         aend = n;
 515                                         continue;
 516                                 }
 517                                 if (astart == aend)
 518                                         (*msg)("ALLOCATED %s %" PRId64
 519                                             " MARKED FREE\n",
 520                                             name, astart);
 521                                 else
 522                                         (*msg)("%s %sS %" PRId64 "-%" PRId64
 523                                             " MARKED FREE\n",
 524                                             "ALLOCATED", name, astart, aend);
 525                                 astart = aend = n;
 526                         } else {
 527                                 if (ustart == -1) {
 528                                         ustart = uend = n;
 529                                         continue;
 530                                 }
 531                                 if (uend + 1 == n) {
 532                                         uend = n;
 533                                         continue;
 534                                 }
 535                                 size = uend - ustart + 1;
 536                                 if (size <= skip) {
 537                                         skip -= size;
 538                                         ustart = uend = n;
 539                                         continue;
 540                                 }
 541                                 if (skip > 0) {
 542                                         ustart += skip;
 543                                         size -= skip;
 544                                         skip = 0;
 545                                 }
 546                                 if (size > limit)
 547                                         size = limit;
 548                                 if (debug && size == 1)
 549                                         pwarn("%s %s %" PRId64
 550                                             " MARKED USED\n",
 551                                             "UNALLOCATED", name, ustart);
 552                                 else if (debug)
 553                                         pwarn("%s %sS %" PRId64 "-%" PRId64
 554                                             " MARKED USED\n",
 555                                             "UNALLOCATED", name, ustart,
 556                                             ustart + size - 1);
 557                                 if (usesysctl != 0) {
 558                                         cmd.value = ustart;
 559                                         cmd.size = size;
 560                                         if (sysctl(opcode, MIBSIZE, 0, 0,
 561                                             &cmd, sizeof cmd) == -1) {
 562                                                 snprintf(buf, BUFSIZE,
 563                                                     "FREE %s", name);
 564                                                 rwerror(buf, cmd.value);
 565                                         }
 566                                 }
 567                                 limit -= size;
 568                                 if (limit <= 0)
 569                                         return;
 570                                 ustart = uend = n;
 571                         }
 572                 }
 573         }
 574         if (astart != -1) {
 575                 if (astart == aend)
 576                         (*msg)("ALLOCATED %s %" PRId64
 577                             " MARKED FREE\n", name, astart);
 578                 else
 579                         (*msg)("ALLOCATED %sS %" PRId64 "-%" PRId64
 580                             " MARKED FREE\n",
 581                             name, astart, aend);
 582         }
 583         if (ustart != -1) {
 584                 size = uend - ustart + 1;
 585                 if (size <= skip)
 586                         return;
 587                 if (skip > 0) {
 588                         ustart += skip;
 589                         size -= skip;
 590                 }
 591                 if (size > limit)
 592                         size = limit;
 593                 if (debug) {
 594                         if (size == 1)
 595                                 pwarn("UNALLOCATED %s %" PRId64
 596                                     " MARKED USED\n",
 597                                     name, ustart);
 598                         else
 599                                 pwarn("UNALLOCATED %sS %" PRId64 "-%" PRId64
 600                                     " MARKED USED\n",
 601                                     name, ustart, ustart + size - 1);
 602                 }
 603                 if (usesysctl != 0) {
 604                         cmd.value = ustart;
 605                         cmd.size = size;
 606                         if (sysctl(opcode, MIBSIZE, 0, 0, &cmd,
 607                             sizeof cmd) == -1) {
 608                                 snprintf(buf, BUFSIZE, "FREE %s", name);
 609                                 rwerror(buf, cmd.value);
 610                         }
 611                 }
 612         }
 613 }
 614
 615 static void
 616 clear_blocks(ufs2_daddr_t start, ufs2_daddr_t end)
 617 {
 618
 619         if (debug)
 620                 printf("Zero frags %jd to %jd\n", start, end);
 621         if (Zflag)
 622                 blzero(fswritefd, fsbtodb(&sblock, start),
 623                     lfragtosize(&sblock, end - start + 1));
 624         if (Eflag)
 625                 blerase(fswritefd, fsbtodb(&sblock, start),
 626                     lfragtosize(&sblock, end - start + 1));
 627 }