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         ufs2_daddr_t d, dbase, dmax, start;
  63         int rewritecg = 0;
  64         struct csum *cs;
  65         struct csum_total cstotal;
  66         struct inodesc idesc[3];
  67         char buf[MAXBSIZE];
  68         struct cg *cg, *newcg = (struct cg *)buf;
  69         struct bufarea *cgbp;
  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                 cgbp = cgget(c);
 166                 cg = cgbp->b_un.b_cg;
 167                 if (!cg_chkmagic(cg))
 168                         pfatal("CG %d: BAD MAGIC NUMBER\n", c);
 169                 newcg->cg_time = cg->cg_time;
 170                 newcg->cg_old_time = cg->cg_old_time;
 171                 newcg->cg_unrefs = cg->cg_unrefs;
 172                 newcg->cg_cgx = c;
 173                 dbase = cgbase(fs, c);
 174                 dmax = dbase + fs->fs_fpg;
 175                 if (dmax > fs->fs_size)
 176                         dmax = fs->fs_size;
 177                 newcg->cg_ndblk = dmax - dbase;
 178                 if (fs->fs_magic == FS_UFS1_MAGIC) {
 179                         if (c == fs->fs_ncg - 1)
 180                                 newcg->cg_old_ncyl = howmany(newcg->cg_ndblk,
 181                                     fs->fs_fpg / fs->fs_old_cpg);
 182                         else
 183                                 newcg->cg_old_ncyl = fs->fs_old_cpg;
 184                         newcg->cg_old_niblk = fs->fs_ipg;
 185                         newcg->cg_niblk = 0;
 186                 }
 187                 if (fs->fs_contigsumsize > 0)
 188                         newcg->cg_nclusterblks = newcg->cg_ndblk / fs->fs_frag;
 189                 newcg->cg_cs.cs_ndir = 0;
 190                 newcg->cg_cs.cs_nffree = 0;
 191                 newcg->cg_cs.cs_nbfree = 0;
 192                 newcg->cg_cs.cs_nifree = fs->fs_ipg;
 193                 if (cg->cg_rotor >= 0 && cg->cg_rotor < newcg->cg_ndblk)
 194                         newcg->cg_rotor = cg->cg_rotor;
 195                 else
 196                         newcg->cg_rotor = 0;
 197                 if (cg->cg_frotor >= 0 && cg->cg_frotor < newcg->cg_ndblk)
 198                         newcg->cg_frotor = cg->cg_frotor;
 199                 else
 200                         newcg->cg_frotor = 0;
 201                 if (cg->cg_irotor >= 0 && cg->cg_irotor < fs->fs_ipg)
 202                         newcg->cg_irotor = cg->cg_irotor;
 203                 else
 204                         newcg->cg_irotor = 0;
 205                 if (fs->fs_magic == FS_UFS1_MAGIC) {
 206                         newcg->cg_initediblk = 0;
 207                 } else {
 208                         if ((unsigned)cg->cg_initediblk > fs->fs_ipg)
 209                                 newcg->cg_initediblk = fs->fs_ipg;
 210                         else
 211                                 newcg->cg_initediblk = cg->cg_initediblk;
 212                 }
 213                 memset(&newcg->cg_frsum[0], 0, sizeof newcg->cg_frsum);
 214                 memset(cg_inosused(newcg), 0, (size_t)(mapsize));
 215                 j = fs->fs_ipg * c;
 216                 for (i = 0; i < inostathead[c].il_numalloced; j++, i++) {
 217                         switch (inoinfo(j)->ino_state) {
 218
 219                         case USTATE:
 220                                 break;
 221
 222                         case DSTATE:
 223                         case DCLEAR:
 224                         case DFOUND:
 225                         case DZLINK:
 226                                 newcg->cg_cs.cs_ndir++;
 227                                 /* FALLTHROUGH */
 228
 229                         case FSTATE:
 230                         case FCLEAR:
 231                         case FZLINK:
 232                                 newcg->cg_cs.cs_nifree--;
 233                                 setbit(cg_inosused(newcg), i);
 234                                 break;
 235
 236                         default:
 237                                 if (j < (int)ROOTINO)
 238                                         break;
 239                                 errx(EEXIT, "BAD STATE %d FOR INODE I=%d",
 240                                     inoinfo(j)->ino_state, j);
 241                         }
 242                 }
 243                 if (c == 0)
 244                         for (i = 0; i < (int)ROOTINO; i++) {
 245                                 setbit(cg_inosused(newcg), i);
 246                                 newcg->cg_cs.cs_nifree--;
 247                         }
 248                 start = -1;
 249                 for (i = 0, d = dbase;
 250                      d < dmax;
 251                      d += fs->fs_frag, i += fs->fs_frag) {
 252                         frags = 0;
 253                         for (j = 0; j < fs->fs_frag; j++) {
 254                                 if (testbmap(d + j)) {
 255                                         if ((Eflag || Zflag) && start != -1) {
 256                                                 clear_blocks(start, d + j - 1);
 257                                                 start = -1;
 258                                         }
 259                                         continue;
 260                                 }
 261                                 if (start == -1)
 262                                         start = d + j;
 263                                 setbit(cg_blksfree(newcg), i + j);
 264                                 frags++;
 265                         }
 266                         if (frags == fs->fs_frag) {
 267                                 newcg->cg_cs.cs_nbfree++;
 268                                 if (fs->fs_contigsumsize > 0)
 269                                         setbit(cg_clustersfree(newcg),
 270                                             i / fs->fs_frag);
 271                         } else if (frags > 0) {
 272                                 newcg->cg_cs.cs_nffree += frags;
 273                                 blk = blkmap(fs, cg_blksfree(newcg), i);
 274                                 ffs_fragacct(fs, blk, newcg->cg_frsum, 1);
 275                         }
 276                 }
 277                 if ((Eflag || Zflag) && start != -1)
 278                         clear_blocks(start, d - 1);
 279                 if (fs->fs_contigsumsize > 0) {
 280                         int32_t *sump = cg_clustersum(newcg);
 281                         u_char *mapp = cg_clustersfree(newcg);
 282                         int map = *mapp++;
 283                         int bit = 1;
 284                         int run = 0;
 285
 286                         for (i = 0; i < newcg->cg_nclusterblks; i++) {
 287                                 if ((map & bit) != 0) {
 288                                         run++;
 289                                 } else if (run != 0) {
 290                                         if (run > fs->fs_contigsumsize)
 291                                                 run = fs->fs_contigsumsize;
 292                                         sump[run]++;
 293                                         run = 0;
 294                                 }
 295                                 if ((i & (CHAR_BIT - 1)) != (CHAR_BIT - 1)) {
 296                                         bit <<= 1;
 297                                 } else {
 298                                         map = *mapp++;
 299                                         bit = 1;
 300                                 }
 301                         }
 302                         if (run != 0) {
 303                                 if (run > fs->fs_contigsumsize)
 304                                         run = fs->fs_contigsumsize;
 305                                 sump[run]++;
 306                         }
 307                 }
 308                 if (bkgrdflag != 0) {
 309                         cstotal.cs_nffree += cg->cg_cs.cs_nffree;
 310                         cstotal.cs_nbfree += cg->cg_cs.cs_nbfree;
 311                         cstotal.cs_nifree += cg->cg_cs.cs_nifree;
 312                         cstotal.cs_ndir += cg->cg_cs.cs_ndir;
 313                 } else {
 314                         cstotal.cs_nffree += newcg->cg_cs.cs_nffree;
 315                         cstotal.cs_nbfree += newcg->cg_cs.cs_nbfree;
 316                         cstotal.cs_nifree += newcg->cg_cs.cs_nifree;
 317                         cstotal.cs_ndir += newcg->cg_cs.cs_ndir;
 318                 }
 319                 cs = &fs->fs_cs(fs, c);
 320                 if (cursnapshot == 0 &&
 321                     memcmp(&newcg->cg_cs, cs, sizeof *cs) != 0 &&
 322                     dofix(&idesc[0], "FREE BLK COUNT(S) WRONG IN SUPERBLK")) {
 323                         memmove(cs, &newcg->cg_cs, sizeof *cs);
 324                         sbdirty();
 325                 }
 326                 if (rewritecg) {
 327                         memmove(cg, newcg, (size_t)fs->fs_cgsize);
 328                         dirty(cgbp);
 329                         continue;
 330                 }
 331                 if (cursnapshot == 0 &&
 332                     memcmp(newcg, cg, basesize) != 0 &&
 333                     dofix(&idesc[2], "SUMMARY INFORMATION BAD")) {
 334                         memmove(cg, newcg, (size_t)basesize);
 335                         dirty(cgbp);
 336                 }
 337                 if (bkgrdflag != 0 || usedsoftdep || debug)
 338                         update_maps(cg, newcg, bkgrdflag);
 339                 if (cursnapshot == 0 &&
 340                     memcmp(cg_inosused(newcg), cg_inosused(cg), mapsize) != 0 &&
 341                     dofix(&idesc[1], "BLK(S) MISSING IN BIT MAPS")) {
 342                         memmove(cg_inosused(cg), cg_inosused(newcg),
 343                               (size_t)mapsize);
 344                         dirty(cgbp);
 345                 }
 346         }
 347         if (cursnapshot == 0 &&
 348             memcmp(&cstotal, &fs->fs_cstotal, sizeof cstotal) != 0
 349             && dofix(&idesc[0], "SUMMARY BLK COUNT(S) WRONG IN SUPERBLK")) {
 350                 memmove(&fs->fs_cstotal, &cstotal, sizeof cstotal);
 351                 fs->fs_ronly = 0;
 352                 fs->fs_fmod = 0;
 353                 sbdirty();
 354         }
 355
 356         /*
 357          * When doing background fsck on a snapshot, figure out whether
 358          * the superblock summary is inaccurate and correct it when
 359          * necessary.
 360          */
 361         if (cursnapshot != 0) {
 362                 cmd.size = 1;
 363
 364                 cmd.value = cstotal.cs_ndir - fs->fs_cstotal.cs_ndir;
 365                 if (cmd.value != 0) {
 366                         if (debug)
 367                                 printf("adjndir by %+" PRIi64 "\n", cmd.value);
 368                         if (bkgrdsumadj == 0 || sysctl(adjndir, MIBSIZE, 0, 0,
 369                             &cmd, sizeof cmd) == -1)
 370                                 rwerror("ADJUST NUMBER OF DIRECTORIES", cmd.value);
 371                 }
 372
 373                 cmd.value = cstotal.cs_nbfree - fs->fs_cstotal.cs_nbfree;
 374                 if (cmd.value != 0) {
 375                         if (debug)
 376                                 printf("adjnbfree by %+" PRIi64 "\n", cmd.value);
 377                         if (bkgrdsumadj == 0 || sysctl(adjnbfree, MIBSIZE, 0, 0,
 378                             &cmd, sizeof cmd) == -1)
 379                                 rwerror("ADJUST NUMBER OF FREE BLOCKS", cmd.value);
 380                 }
 381
 382                 cmd.value = cstotal.cs_nifree - fs->fs_cstotal.cs_nifree;
 383                 if (cmd.value != 0) {
 384                         if (debug)
 385                                 printf("adjnifree by %+" PRIi64 "\n", cmd.value);
 386                         if (bkgrdsumadj == 0 || sysctl(adjnifree, MIBSIZE, 0, 0,
 387                             &cmd, sizeof cmd) == -1)
 388                                 rwerror("ADJUST NUMBER OF FREE INODES", cmd.value);
 389                 }
 390
 391                 cmd.value = cstotal.cs_nffree - fs->fs_cstotal.cs_nffree;
 392                 if (cmd.value != 0) {
 393                         if (debug)
 394                                 printf("adjnffree by %+" PRIi64 "\n", cmd.value);
 395                         if (bkgrdsumadj == 0 || sysctl(adjnffree, MIBSIZE, 0, 0,
 396                             &cmd, sizeof cmd) == -1)
 397                                 rwerror("ADJUST NUMBER OF FREE FRAGS", cmd.value);
 398                 }
 399
 400                 cmd.value = cstotal.cs_numclusters - fs->fs_cstotal.cs_numclusters;
 401                 if (cmd.value != 0) {
 402                         if (debug)
 403                                 printf("adjnumclusters by %+" PRIi64 "\n", cmd.value);
 404                         if (bkgrdsumadj == 0 || sysctl(adjnumclusters, MIBSIZE, 0, 0,
 405                             &cmd, sizeof cmd) == -1)
 406                                 rwerror("ADJUST NUMBER OF FREE CLUSTERS", cmd.value);
 407                 }
 408         }
 409 }
 410
 411 /*
 412  * Compare the original cylinder group inode and block bitmaps with the
 413  * updated cylinder group inode and block bitmaps. Free inodes and blocks
 414  * that have been added. Complain if any previously freed inodes blocks
 415  * are now allocated.
 416  */
 417 void
 418 update_maps(
 419         struct cg *oldcg,       /* cylinder group of claimed allocations */
 420         struct cg *newcg,       /* cylinder group of determined allocations */
 421         int usesysctl)          /* 1 => use sysctl interface to update maps */
 422 {
 423         int inomapsize, excessdirs;
 424         struct fs *fs = &sblock;
 425
 426         inomapsize = howmany(fs->fs_ipg, CHAR_BIT);
 427         excessdirs = oldcg->cg_cs.cs_ndir - newcg->cg_cs.cs_ndir;
 428         if (excessdirs < 0) {
 429                 pfatal("LOST %d DIRECTORIES\n", -excessdirs);
 430                 excessdirs = 0;
 431         }
 432         if (excessdirs > 0)
 433                 check_maps(cg_inosused(newcg), cg_inosused(oldcg), inomapsize,
 434                     oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_ipg, "DIR", freedirs,
 435                     0, excessdirs, usesysctl);
 436         check_maps(cg_inosused(newcg), cg_inosused(oldcg), inomapsize,
 437             oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_ipg, "FILE", freefiles,
 438             excessdirs, fs->fs_ipg, usesysctl);
 439         check_maps(cg_blksfree(oldcg), cg_blksfree(newcg),
 440             howmany(fs->fs_fpg, CHAR_BIT),
 441             oldcg->cg_cgx * (ufs2_daddr_t)fs->fs_fpg, "FRAG",
 442             freeblks, 0, fs->fs_fpg, usesysctl);
 443 }
 444
 445 static void
 446 check_maps(
 447         u_char *map1,   /* map of claimed allocations */
 448         u_char *map2,   /* map of determined allocations */
 449         int mapsize,    /* size of above two maps */
 450         ufs2_daddr_t startvalue, /* resource value for first element in map */
 451         const char *name,       /* name of resource found in maps */
 452         int *opcode,    /* sysctl opcode to free resource */
 453         int skip,       /* number of entries to skip before starting to free */
 454         int limit,      /* limit on number of entries to free */
 455         int usesysctl)  /* 1 => use sysctl interface to update maps */
 456 {
 457 #       define BUFSIZE 16
 458         char buf[BUFSIZE];
 459         long i, j, k, l, m, size;
 460         ufs2_daddr_t n, astart, aend, ustart, uend;
 461         void (*msg)(const char *fmt, ...);
 462
 463         if (usesysctl)
 464                 msg = pfatal;
 465         else
 466                 msg = pwarn;
 467         astart = ustart = aend = uend = -1;
 468         for (i = 0; i < mapsize; i++) {
 469                 j = *map1++;
 470                 k = *map2++;
 471                 if (j == k)
 472                         continue;
 473                 for (m = 0, l = 1; m < CHAR_BIT; m++, l <<= 1) {
 474                         if ((j & l) == (k & l))
 475                                 continue;
 476                         n = startvalue + i * CHAR_BIT + m;
 477                         if ((j & l) != 0) {
 478                                 if (astart == -1) {
 479                                         astart = aend = n;
 480                                         continue;
 481                                 }
 482                                 if (aend + 1 == n) {
 483                                         aend = n;
 484                                         continue;
 485                                 }
 486                                 if (astart == aend)
 487                                         (*msg)("ALLOCATED %s %" PRId64
 488                                             " MARKED FREE\n",
 489                                             name, astart);
 490                                 else
 491                                         (*msg)("%s %sS %" PRId64 "-%" PRId64
 492                                             " MARKED FREE\n",
 493                                             "ALLOCATED", name, astart, aend);
 494                                 astart = aend = n;
 495                         } else {
 496                                 if (ustart == -1) {
 497                                         ustart = uend = n;
 498                                         continue;
 499                                 }
 500                                 if (uend + 1 == n) {
 501                                         uend = n;
 502                                         continue;
 503                                 }
 504                                 size = uend - ustart + 1;
 505                                 if (size <= skip) {
 506                                         skip -= size;
 507                                         ustart = uend = n;
 508                                         continue;
 509                                 }
 510                                 if (skip > 0) {
 511                                         ustart += skip;
 512                                         size -= skip;
 513                                         skip = 0;
 514                                 }
 515                                 if (size > limit)
 516                                         size = limit;
 517                                 if (debug && size == 1)
 518                                         pwarn("%s %s %" PRId64
 519                                             " MARKED USED\n",
 520                                             "UNALLOCATED", name, ustart);
 521                                 else if (debug)
 522                                         pwarn("%s %sS %" PRId64 "-%" PRId64
 523                                             " MARKED USED\n",
 524                                             "UNALLOCATED", name, ustart,
 525                                             ustart + size - 1);
 526                                 if (usesysctl != 0) {
 527                                         cmd.value = ustart;
 528                                         cmd.size = size;
 529                                         if (sysctl(opcode, MIBSIZE, 0, 0,
 530                                             &cmd, sizeof cmd) == -1) {
 531                                                 snprintf(buf, BUFSIZE,
 532                                                     "FREE %s", name);
 533                                                 rwerror(buf, cmd.value);
 534                                         }
 535                                 }
 536                                 limit -= size;
 537                                 if (limit <= 0)
 538                                         return;
 539                                 ustart = uend = n;
 540                         }
 541                 }
 542         }
 543         if (astart != -1) {
 544                 if (astart == aend)
 545                         (*msg)("ALLOCATED %s %" PRId64
 546                             " MARKED FREE\n", name, astart);
 547                 else
 548                         (*msg)("ALLOCATED %sS %" PRId64 "-%" PRId64
 549                             " MARKED FREE\n",
 550                             name, astart, aend);
 551         }
 552         if (ustart != -1) {
 553                 size = uend - ustart + 1;
 554                 if (size <= skip)
 555                         return;
 556                 if (skip > 0) {
 557                         ustart += skip;
 558                         size -= skip;
 559                 }
 560                 if (size > limit)
 561                         size = limit;
 562                 if (debug) {
 563                         if (size == 1)
 564                                 pwarn("UNALLOCATED %s %" PRId64
 565                                     " MARKED USED\n",
 566                                     name, ustart);
 567                         else
 568                                 pwarn("UNALLOCATED %sS %" PRId64 "-%" PRId64
 569                                     " MARKED USED\n",
 570                                     name, ustart, ustart + size - 1);
 571                 }
 572                 if (usesysctl != 0) {
 573                         cmd.value = ustart;
 574                         cmd.size = size;
 575                         if (sysctl(opcode, MIBSIZE, 0, 0, &cmd,
 576                             sizeof cmd) == -1) {
 577                                 snprintf(buf, BUFSIZE, "FREE %s", name);
 578                                 rwerror(buf, cmd.value);
 579                         }
 580                 }
 581         }
 582 }
 583
 584 static void
 585 clear_blocks(ufs2_daddr_t start, ufs2_daddr_t end)
 586 {
 587
 588         if (debug)
 589                 printf("Zero frags %jd to %jd\n", start, end);
 590         if (Zflag)
 591                 blzero(fswritefd, fsbtodb(&sblock, start),
 592                     lfragtosize(&sblock, end - start + 1));
 593         if (Eflag)
 594                 blerase(fswritefd, fsbtodb(&sblock, start),
 595                     lfragtosize(&sblock, end - start + 1));
 596 }