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