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 #include <libufs.h>
  49
  50 #include "fsck.h"
  51
  52 static void check_maps(u_char *, u_char *, int, ufs2_daddr_t, const char *,
  53                         int *, int, int, int);
  54 static void clear_blocks(ufs2_daddr_t start, ufs2_daddr_t end);
  55
  56 void
  57 pass5(void)
  58 {
  59         int c, i, j, blk, frags, basesize, mapsize;
  60         int inomapsize, blkmapsize;
  61         struct fs *fs = &sblock;
  62         struct cg *cg = &cgrp;
  63         ufs2_daddr_t d, dbase, dmax, start;
  64         int rewritecg = 0;
  65         struct csum *cs;
  66         struct csum_total cstotal;
  67         struct inodesc idesc[3];
  68         char buf[MAXBSIZE];
  69         struct cg *newcg = (struct cg *)buf;
  70
  71         inoinfo(WINO)->ino_state = USTATE;
  72         memset(newcg, 0, (size_t)fs->fs_cgsize);
  73         newcg->cg_niblk = fs->fs_ipg;
  74         if (cvtlevel >= 3) {
  75                 if (fs->fs_maxcontig < 2 && fs->fs_contigsumsize > 0) {
  76                         if (preen)
  77                                 pwarn("DELETING CLUSTERING MAPS\n");
  78                         if (preen || reply("DELETE CLUSTERING MAPS")) {
  79                                 fs->fs_contigsumsize = 0;
  80                                 rewritecg = 1;
  81                                 sbdirty();
  82                         }
  83                 }
  84                 if (fs->fs_maxcontig > 1) {
  85                         const char *doit = 0;
  86
  87                         if (fs->fs_contigsumsize < 1) {
  88                                 doit = "CREAT";
  89                         } else if (fs->fs_contigsumsize < fs->fs_maxcontig &&
  90                                    fs->fs_contigsumsize < FS_MAXCONTIG) {
  91                                 doit = "EXPAND";
  92                         }
  93                         if (doit) {
  94                                 i = fs->fs_contigsumsize;
  95                                 fs->fs_contigsumsize =
  96                                     MIN(fs->fs_maxcontig, FS_MAXCONTIG);
  97                                 if (CGSIZE(fs) > (u_int)fs->fs_bsize) {
  98                                         pwarn("CANNOT %s CLUSTER MAPS\n", doit);
  99                                         fs->fs_contigsumsize = i;
 100                                 } else if (preen ||
 101                                     reply("CREATE CLUSTER MAPS")) {
 102                                         if (preen)
 103                                                 pwarn("%sING CLUSTER MAPS\n",
 104                                                     doit);
 105                                         fs->fs_cgsize =
 106                                             fragroundup(fs, CGSIZE(fs));
 107                                         rewritecg = 1;
 108                                         sbdirty();
 109                                 }
 110                         }
 111                 }
 112         }
 113         basesize = &newcg->cg_space[0] - (u_char *)(&newcg->cg_firstfield);
 114         if (sblock.fs_magic == FS_UFS2_MAGIC) {
 115                 newcg->cg_iusedoff = basesize;
 116         } else {
 117                 /*
 118                  * We reserve the space for the old rotation summary
 119                  * tables for the benefit of old kernels, but do not
 120                  * maintain them in modern kernels. In time, they can
 121                  * go away.
 122                  */
 123                 newcg->cg_old_btotoff = basesize;
 124                 newcg->cg_old_boff = newcg->cg_old_btotoff +
 125                     fs->fs_old_cpg * sizeof(int32_t);
 126                 newcg->cg_iusedoff = newcg->cg_old_boff +
 127                     fs->fs_old_cpg * fs->fs_old_nrpos * sizeof(u_int16_t);
 128                 memset(&newcg->cg_space[0], 0, newcg->cg_iusedoff - basesize);
 129         }
 130         inomapsize = howmany(fs->fs_ipg, CHAR_BIT);
 131         newcg->cg_freeoff = newcg->cg_iusedoff + inomapsize;
 132         blkmapsize = howmany(fs->fs_fpg, CHAR_BIT);
 133         newcg->cg_nextfreeoff = newcg->cg_freeoff + blkmapsize;
 134         if (fs->fs_contigsumsize > 0) {
 135                 newcg->cg_clustersumoff = newcg->cg_nextfreeoff -
 136                     sizeof(u_int32_t);
 137                 newcg->cg_clustersumoff =
 138                     roundup(newcg->cg_clustersumoff, sizeof(u_int32_t));
 139                 newcg->cg_clusteroff = newcg->cg_clustersumoff +
 140                     (fs->fs_contigsumsize + 1) * sizeof(u_int32_t);
 141                 newcg->cg_nextfreeoff = newcg->cg_clusteroff +
 142                     howmany(fragstoblks(fs, fs->fs_fpg), CHAR_BIT);
 143         }
 144         newcg->cg_magic = CG_MAGIC;
 145         mapsize = newcg->cg_nextfreeoff - newcg->cg_iusedoff;
 146         memset(&idesc[0], 0, sizeof idesc);
 147         for (i = 0; i < 3; i++)
 148                 idesc[i].id_type = ADDR;
 149         memset(&cstotal, 0, sizeof(struct csum_total));
 150         dmax = blknum(fs, fs->fs_size + fs->fs_frag - 1);
 151         for (d = fs->fs_size; d < dmax; d++)
 152                 setbmap(d);
 153         for (c = 0; c < fs->fs_ncg; c++) {
 154                 if (got_siginfo) {
 155                         printf("%s: phase 5: cyl group %d of %d (%d%%)\n",
 156                             cdevname, c, sblock.fs_ncg,
 157                             c * 100 / sblock.fs_ncg);
 158                         got_siginfo = 0;
 159                 }
 160                 if (got_sigalarm) {
 161                         setproctitle("%s p5 %d%%", cdevname,
 162                             c * 100 / sblock.fs_ncg);
 163                         got_sigalarm = 0;
 164                 }
 165                 getblk(&cgblk, cgtod(fs, c), fs->fs_cgsize);
 166                 if (!cg_chkmagic(cg))
 167                         pfatal("CG %d: BAD MAGIC NUMBER\n", c);
 168                 newcg->cg_time = cg->cg_time;
 169                 newcg->cg_old_time = cg->cg_old_time;
 170                 newcg->cg_unrefs = cg->cg_unrefs;
 171                 newcg->cg_cgx = c;
 172                 dbase = cgbase(fs, c);
 173                 dmax = dbase + fs->fs_fpg;
 174                 if (dmax > fs->fs_size)
 175                         dmax = fs->fs_size;
 176                 newcg->cg_ndblk = dmax - dbase;
 177                 if (fs->fs_magic == FS_UFS1_MAGIC) {
 178                         if (c == fs->fs_ncg - 1)
 179                                 newcg->cg_old_ncyl = howmany(newcg->cg_ndblk,
 180                                     fs->fs_fpg / fs->fs_old_cpg);
 181                         else
 182                                 newcg->cg_old_ncyl = fs->fs_old_cpg;
 183                         newcg->cg_old_niblk = fs->fs_ipg;
 184                         newcg->cg_niblk = 0;
 185                 }
 186                 if (fs->fs_contigsumsize > 0)
 187                         newcg->cg_nclusterblks = newcg->cg_ndblk / fs->fs_frag;
 188                 newcg->cg_cs.cs_ndir = 0;
 189                 newcg->cg_cs.cs_nffree = 0;
 190                 newcg->cg_cs.cs_nbfree = 0;
 191                 newcg->cg_cs.cs_nifree = fs->fs_ipg;
 192                 if (cg->cg_rotor >= 0 && cg->cg_rotor < newcg->cg_ndblk)
 193                         newcg->cg_rotor = cg->cg_rotor;
 194                 else
 195                         newcg->cg_rotor = 0;
 196                 if (cg->cg_frotor >= 0 && cg->cg_frotor < newcg->cg_ndblk)
 197                         newcg->cg_frotor = cg->cg_frotor;
 198                 else
 199                         newcg->cg_frotor = 0;
 200                 if (cg->cg_irotor >= 0 && cg->cg_irotor < fs->fs_ipg)
 201                         newcg->cg_irotor = cg->cg_irotor;
 202                 else
 203                         newcg->cg_irotor = 0;
 204                 if (fs->fs_magic == FS_UFS1_MAGIC) {
 205                         newcg->cg_initediblk = 0;
 206                 } else {
 207                         if ((unsigned)cg->cg_initediblk > fs->fs_ipg)
 208                                 newcg->cg_initediblk = fs->fs_ipg;
 209                         else
 210                                 newcg->cg_initediblk = cg->cg_initediblk;
 211                 }
 212                 memset(&newcg->cg_frsum[0], 0, sizeof newcg->cg_frsum);
 213                 memset(cg_inosused(newcg), 0, (size_t)(mapsize));
 214                 j = fs->fs_ipg * c;
 215                 for (i = 0; i < inostathead[c].il_numalloced; j++, i++) {
 216                         switch (inoinfo(j)->ino_state) {
 217
 218                         case USTATE:
 219                                 break;
 220
 221                         case DSTATE:
 222                         case DCLEAR:
 223                         case DFOUND:
 224                         case DZLINK:
 225                                 newcg->cg_cs.cs_ndir++;
 226                                 /* FALLTHROUGH */
 227
 228                         case FSTATE:
 229                         case FCLEAR:
 230                         case FZLINK:
 231                                 newcg->cg_cs.cs_nifree--;
 232                                 setbit(cg_inosused(newcg), i);
 233                                 break;
 234
 235                         default:
 236                                 if (j < (int)ROOTINO)
 237                                         break;
 238                                 errx(EEXIT, "BAD STATE %d FOR INODE I=%d",
 239                                     inoinfo(j)->ino_state, j);
 240                         }
 241                 }
 242                 if (c == 0)
 243                         for (i = 0; i < (int)ROOTINO; i++) {
 244                                 setbit(cg_inosused(newcg), i);
 245                                 newcg->cg_cs.cs_nifree--;
 246                         }
 247                 start = -1;
 248                 for (i = 0, d = dbase;
 249                      d < dmax;
 250                      d += fs->fs_frag, i += fs->fs_frag) {
 251                         frags = 0;
 252                         for (j = 0; j < fs->fs_frag; j++) {
 253                                 if (testbmap(d + j)) {
 254                                         if (Eflag && start != -1) {
 255                                                 clear_blocks(start, d + j - 1);
 256                                                 start = -1;
 257                                         }
 258                                         continue;
 259                                 }
 260                                 if (start == -1)
 261                                         start = d + j;
 262                                 setbit(cg_blksfree(newcg), i + j);
 263                                 frags++;
 264                         }
 265                         if (frags == fs->fs_frag) {
 266                                 newcg->cg_cs.cs_nbfree++;
 267                                 if (fs->fs_contigsumsize > 0)
 268                                         setbit(cg_clustersfree(newcg),
 269                                             i / fs->fs_frag);
 270                         } else if (frags > 0) {
 271                                 newcg->cg_cs.cs_nffree += frags;
 272                                 blk = blkmap(fs, cg_blksfree(newcg), i);
 273                                 ffs_fragacct(fs, blk, newcg->cg_frsum, 1);
 274                         }
 275                 }
 276                 if (Eflag && start != -1)
 277                         clear_blocks(start, d - 1);
 278                 if (fs->fs_contigsumsize > 0) {
 279                         int32_t *sump = cg_clustersum(newcg);
 280                         u_char *mapp = cg_clustersfree(newcg);
 281                         int map = *mapp++;
 282                         int bit = 1;
 283                         int run = 0;
 284
 285                         for (i = 0; i < newcg->cg_nclusterblks; i++) {
 286                                 if ((map & bit) != 0) {
 287                                         run++;
 288                                 } else if (run != 0) {
 289                                         if (run > fs->fs_contigsumsize)
 290                                                 run = fs->fs_contigsumsize;
 291                                         sump[run]++;
 292                                         run = 0;
 293                                 }
 294                                 if ((i & (CHAR_BIT - 1)) != (CHAR_BIT - 1)) {
 295                                         bit <<= 1;
 296                                 } else {
 297                                         map = *mapp++;
 298                                         bit = 1;
 299                                 }
 300                         }
 301                         if (run != 0) {
 302                                 if (run > fs->fs_contigsumsize)
 303                                         run = fs->fs_contigsumsize;
 304                                 sump[run]++;
 305                         }
 306                 }
 307                 if (bkgrdflag != 0) {
 308                         cstotal.cs_nffree += cg->cg_cs.cs_nffree;
 309                         cstotal.cs_nbfree += cg->cg_cs.cs_nbfree;
 310                         cstotal.cs_nifree += cg->cg_cs.cs_nifree;
 311                         cstotal.cs_ndir += cg->cg_cs.cs_ndir;
 312                 } else {
 313                         cstotal.cs_nffree += newcg->cg_cs.cs_nffree;
 314                         cstotal.cs_nbfree += newcg->cg_cs.cs_nbfree;
 315                         cstotal.cs_nifree += newcg->cg_cs.cs_nifree;
 316                         cstotal.cs_ndir += newcg->cg_cs.cs_ndir;
 317                 }
 318                 cs = &fs->fs_cs(fs, c);
 319                 if (cursnapshot == 0 &&
 320                     memcmp(&newcg->cg_cs, cs, sizeof *cs) != 0 &&
 321                     dofix(&idesc[0], "FREE BLK COUNT(S) WRONG IN SUPERBLK")) {
 322                         memmove(cs, &newcg->cg_cs, sizeof *cs);
 323                         sbdirty();
 324                 }
 325                 if (rewritecg) {
 326                         memmove(cg, newcg, (size_t)fs->fs_cgsize);
 327                         cgdirty();
 328                         continue;
 329                 }
 330                 if (cursnapshot == 0 &&
 331                     memcmp(newcg, cg, basesize) != 0 &&
 332                     dofix(&idesc[2], "SUMMARY INFORMATION BAD")) {
 333                         memmove(cg, newcg, (size_t)basesize);
 334                         cgdirty();
 335                 }
 336                 if (bkgrdflag != 0 || usedsoftdep || debug)
 337                         update_maps(cg, newcg, bkgrdflag);
 338                 if (cursnapshot == 0 &&
 339                     memcmp(cg_inosused(newcg), cg_inosused(cg), mapsize) != 0 &&
 340                     dofix(&idesc[1], "BLK(S) MISSING IN BIT MAPS")) {
 341                         memmove(cg_inosused(cg), cg_inosused(newcg),
 342                               (size_t)mapsize);
 343                         cgdirty();
 344                 }
 345         }
 346         if (cursnapshot == 0 &&
 347             memcmp(&cstotal, &fs->fs_cstotal, sizeof cstotal) != 0
 348             && dofix(&idesc[0], "SUMMARY BLK COUNT(S) WRONG IN SUPERBLK")) {
 349                 memmove(&fs->fs_cstotal, &cstotal, sizeof cstotal);
 350                 fs->fs_ronly = 0;
 351                 fs->fs_fmod = 0;
 352                 sbdirty();
 353         }
 354
 355         /*
 356          * When doing background fsck on a snapshot, figure out whether
 357          * the superblock summary is inaccurate and correct it when
 358          * necessary.
 359          */
 360         if (cursnapshot != 0) {
 361                 cmd.size = 1;
 362
 363                 cmd.value = cstotal.cs_ndir - fs->fs_cstotal.cs_ndir;
 364                 if (cmd.value != 0) {
 365                         if (debug)
 366                                 printf("adjndir by %+" PRIi64 "\n", cmd.value);
 367                         if (bkgrdsumadj == 0 || sysctl(adjndir, MIBSIZE, 0, 0,
 368                             &cmd, sizeof cmd) == -1)
 369                                 rwerror("ADJUST NUMBER OF DIRECTORIES", cmd.value);
 370                 }
 371
 372                 cmd.value = cstotal.cs_nbfree - fs->fs_cstotal.cs_nbfree;
 373                 if (cmd.value != 0) {
 374                         if (debug)
 375                                 printf("adjnbfree by %+" PRIi64 "\n", cmd.value);
 376                         if (bkgrdsumadj == 0 || sysctl(adjnbfree, MIBSIZE, 0, 0,
 377                             &cmd, sizeof cmd) == -1)
 378                                 rwerror("ADJUST NUMBER OF FREE BLOCKS", cmd.value);
 379                 }
 380
 381                 cmd.value = cstotal.cs_nifree - fs->fs_cstotal.cs_nifree;
 382                 if (cmd.value != 0) {
 383                         if (debug)
 384                                 printf("adjnifree by %+" PRIi64 "\n", cmd.value);
 385                         if (bkgrdsumadj == 0 || sysctl(adjnifree, MIBSIZE, 0, 0,
 386                             &cmd, sizeof cmd) == -1)
 387                                 rwerror("ADJUST NUMBER OF FREE INODES", cmd.value);
 388                 }
 389
 390                 cmd.value = cstotal.cs_nffree - fs->fs_cstotal.cs_nffree;
 391                 if (cmd.value != 0) {
 392                         if (debug)
 393                                 printf("adjnffree by %+" PRIi64 "\n", cmd.value);
 394                         if (bkgrdsumadj == 0 || sysctl(adjnffree, MIBSIZE, 0, 0,
 395                             &cmd, sizeof cmd) == -1)
 396                                 rwerror("ADJUST NUMBER OF FREE FRAGS", cmd.value);
 397                 }
 398
 399                 cmd.value = cstotal.cs_numclusters - fs->fs_cstotal.cs_numclusters;
 400                 if (cmd.value != 0) {
 401                         if (debug)
 402                                 printf("adjnumclusters by %+" PRIi64 "\n", cmd.value);
 403                         if (bkgrdsumadj == 0 || sysctl(adjnumclusters, MIBSIZE, 0, 0,
 404                             &cmd, sizeof cmd) == -1)
 405                                 rwerror("ADJUST NUMBER OF FREE CLUSTERS", cmd.value);
 406                 }
 407         }
 408 }
 409
 410 /*
 411  * Compare the original cylinder group inode and block bitmaps with the
 412  * updated cylinder group inode and block bitmaps. Free inodes and blocks
 413  * that have been added. Complain if any previously freed inodes blocks
 414  * are now allocated.
 415  */
 416 void
 417 update_maps(
 418         struct cg *oldcg,       /* cylinder group of claimed allocations */
 419         struct cg *newcg,       /* cylinder group of determined allocations */
 420         int usesysctl)          /* 1 => use sysctl interface to update maps */
 421 {
 422         int inomapsize, excessdirs;
 423         struct fs *fs = &sblock;
 424
 425         inomapsize = howmany(fs->fs_ipg, CHAR_BIT);
 426         excessdirs = oldcg->cg_cs.cs_ndir - newcg->cg_cs.cs_ndir;
 427         if (excessdirs < 0) {
 428                 pfatal("LOST %d DIRECTORIES\n", -excessdirs);
 429                 excessdirs = 0;
 430         }
 431         if (excessdirs > 0)
 432                 check_maps(cg_inosused(newcg), cg_inosused(oldcg), inomapsize,
 433                     oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_ipg, "DIR", freedirs,
 434                     0, excessdirs, usesysctl);
 435         check_maps(cg_inosused(newcg), cg_inosused(oldcg), inomapsize,
 436             oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_ipg, "FILE", freefiles,
 437             excessdirs, fs->fs_ipg, usesysctl);
 438         check_maps(cg_blksfree(oldcg), cg_blksfree(newcg),
 439             howmany(fs->fs_fpg, CHAR_BIT),
 440             oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_fpg, "FRAG",
 441             freeblks, 0, fs->fs_fpg, usesysctl);
 442 }
 443
 444 static void
 445 check_maps(
 446         u_char *map1,   /* map of claimed allocations */
 447         u_char *map2,   /* map of determined allocations */
 448         int mapsize,    /* size of above two maps */
 449         ufs2_daddr_t startvalue, /* resource value for first element in map */
 450         const char *name,       /* name of resource found in maps */
 451         int *opcode,    /* sysctl opcode to free resource */
 452         int skip,       /* number of entries to skip before starting to free */
 453         int limit,      /* limit on number of entries to free */
 454         int usesysctl)  /* 1 => use sysctl interface to update maps */
 455 {
 456 #       define BUFSIZE 16
 457         char buf[BUFSIZE];
 458         long i, j, k, l, m, size;
 459         ufs2_daddr_t n, astart, aend, ustart, uend;
 460         void (*msg)(const char *fmt, ...);
 461
 462         if (usesysctl)
 463                 msg = pfatal;
 464         else
 465                 msg = pwarn;
 466         astart = ustart = aend = uend = -1;
 467         for (i = 0; i < mapsize; i++) {
 468                 j = *map1++;
 469                 k = *map2++;
 470                 if (j == k)
 471                         continue;
 472                 for (m = 0, l = 1; m < CHAR_BIT; m++, l <<= 1) {
 473                         if ((j & l) == (k & l))
 474                                 continue;
 475                         n = startvalue + i * CHAR_BIT + m;
 476                         if ((j & l) != 0) {
 477                                 if (astart == -1) {
 478                                         astart = aend = n;
 479                                         continue;
 480                                 }
 481                                 if (aend + 1 == n) {
 482                                         aend = n;
 483                                         continue;
 484                                 }
 485                                 if (astart == aend)
 486                                         (*msg)("ALLOCATED %s %" PRId64
 487                                             " MARKED FREE\n",
 488                                             name, astart);
 489                                 else
 490                                         (*msg)("%s %sS %" PRId64 "-%" PRId64
 491                                             " MARKED FREE\n",
 492                                             "ALLOCATED", name, astart, aend);
 493                                 astart = aend = n;
 494                         } else {
 495                                 if (ustart == -1) {
 496                                         ustart = uend = n;
 497                                         continue;
 498                                 }
 499                                 if (uend + 1 == n) {
 500                                         uend = n;
 501                                         continue;
 502                                 }
 503                                 size = uend - ustart + 1;
 504                                 if (size <= skip) {
 505                                         skip -= size;
 506                                         ustart = uend = n;
 507                                         continue;
 508                                 }
 509                                 if (skip > 0) {
 510                                         ustart += skip;
 511                                         size -= skip;
 512                                         skip = 0;
 513                                 }
 514                                 if (size > limit)
 515                                         size = limit;
 516                                 if (debug && size == 1)
 517                                         pwarn("%s %s %" PRId64
 518                                             " MARKED USED\n",
 519                                             "UNALLOCATED", name, ustart);
 520                                 else if (debug)
 521                                         pwarn("%s %sS %" PRId64 "-%" PRId64
 522                                             " MARKED USED\n",
 523                                             "UNALLOCATED", name, ustart,
 524                                             ustart + size - 1);
 525                                 if (usesysctl != 0) {
 526                                         cmd.value = ustart;
 527                                         cmd.size = size;
 528                                         if (sysctl(opcode, MIBSIZE, 0, 0,
 529                                             &cmd, sizeof cmd) == -1) {
 530                                                 snprintf(buf, BUFSIZE,
 531                                                     "FREE %s", name);
 532                                                 rwerror(buf, cmd.value);
 533                                         }
 534                                 }
 535                                 limit -= size;
 536                                 if (limit <= 0)
 537                                         return;
 538                                 ustart = uend = n;
 539                         }
 540                 }
 541         }
 542         if (astart != -1) {
 543                 if (astart == aend)
 544                         (*msg)("ALLOCATED %s %" PRId64
 545                             " MARKED FREE\n", name, astart);
 546                 else
 547                         (*msg)("ALLOCATED %sS %" PRId64 "-%" PRId64
 548                             " MARKED FREE\n",
 549                             name, astart, aend);
 550         }
 551         if (ustart != -1) {
 552                 size = uend - ustart + 1;
 553                 if (size <= skip)
 554                         return;
 555                 if (skip > 0) {
 556                         ustart += skip;
 557                         size -= skip;
 558                 }
 559                 if (size > limit)
 560                         size = limit;
 561                 if (debug) {
 562                         if (size == 1)
 563                                 pwarn("UNALLOCATED %s %" PRId64
 564                                     " MARKED USED\n",
 565                                     name, ustart);
 566                         else
 567                                 pwarn("UNALLOCATED %sS %" PRId64 "-%" PRId64
 568                                     " MARKED USED\n",
 569                                     name, ustart, ustart + size - 1);
 570                 }
 571                 if (usesysctl != 0) {
 572                         cmd.value = ustart;
 573                         cmd.size = size;
 574                         if (sysctl(opcode, MIBSIZE, 0, 0, &cmd,
 575                             sizeof cmd) == -1) {
 576                                 snprintf(buf, BUFSIZE, "FREE %s", name);
 577                                 rwerror(buf, cmd.value);
 578                         }
 579                 }
 580         }
 581 }
 582
 583 static void clear_blocks(ufs2_daddr_t start, ufs2_daddr_t end)
 584 {
 585
 586         if (debug)
 587                 printf("Zero frags %jd to %jd\n", start, end);
 588         blerase(fswritefd, fsbtodb(&sblock, start),
 589             lfragtosize(&sblock, end - start + 1));
 590 }