sbin/fsck_ffs/pass5.c

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