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