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setup.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1980, 1986, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */


#define DKTYPENAMES
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/file.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <string.h>

#include "fsck.h"
#if   REV_ENDIAN_FS
#import "ufs_byte_order.h"
#endif      /* REV_ENDIAN_FS */

struct bufarea asblk;
#define altsblock (*asblk.b_un.b_fs)
#define POWEROF2(num)   (((num) & ((num) - 1)) == 0)

static void badsb __P((int listerr, char *s));
static int calcsb __P((char *dev, int devfd, struct fs *fs));
static struct disklabel *getdisklabel __P((char *s, int fd));
static int readsb __P((int listerr));

#ifdef __APPLE__ 
int dkdisklabel __P((int fd, struct disklabel * lp));
#endif

/*
 * Read in a superblock finding an alternate if necessary.
 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem
 * is already clean (preen mode only).
 */
int
setup(dev)
      char *dev;
{
      long cg, size, asked, i, j;
      long skipclean, bmapsize;
      struct disklabel *lp;
      off_t sizepb;
      struct stat statb;
      struct fs proto;
#ifdef __APPLE__ 
      struct cg *cg0;
      int32_t clustersumoff;
#endif

      havesb = 0;
      fswritefd = -1;

#ifdef  __APPLE__
      if (preen || qflag)
        skipclean = 1;
    else
        skipclean = 0;
#else
      skipclean = preen;
#endif

      if (stat(dev, &statb) < 0) {
            printf("Can't stat %s: %s\n", dev, strerror(errno));
            return (0);
      }
      if ((statb.st_mode & S_IFMT) != S_IFCHR) {
            pfatal("%s is not a character device", dev);
            if (reply("CONTINUE") == 0)
                  return (0);
      }
      if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
            printf("Can't open %s: %s\n", dev, strerror(errno));
            return (0);
      }
      if (preen == 0)
            printf("** %s", dev);
      if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
            fswritefd = -1;
            if (preen)
                  pfatal("NO WRITE ACCESS");
            printf(" (NO WRITE)");
      }
      if (preen == 0)
            printf("\n");
      fsmodified = 0;
      lfdir = 0;
      initbarea(&sblk);
      initbarea(&asblk);
#if   REV_ENDIAN_FS
      sblk.b_type = SUPERBLOCK;
      asblk.b_type = SUPERBLOCK;
#endif      /* REV_ENDIAN_FS */
      sblk.b_un.b_buf = malloc(SBSIZE);
      asblk.b_un.b_buf = malloc(SBSIZE);
      if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
            errx(EEXIT, "cannot allocate space for superblock");
      if (lp = getdisklabel(NULL, fsreadfd))
            dev_bsize = secsize = lp->d_secsize;
      else
            dev_bsize = secsize = DEV_BSIZE;
      /*
       * Read in the superblock, looking for alternates if necessary
       */
      if (readsb(1) == 0) {
#ifdef __APPLE__
          if (qflag)                      
                return (EEXIT);
#endif
            skipclean = 0;
            if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0)
                  return(0);
            if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
                  return (0);
            for (cg = 0; cg < proto.fs_ncg; cg++) {
                  bflag = fsbtodb(&proto, cgsblock(&proto, cg));
                  if (readsb(0) != 0)
                        break;
            }
            if (cg >= proto.fs_ncg) {
                  printf("%s %s\n%s %s\n%s %s\n",
                        "SEARCH FOR ALTERNATE SUPER-BLOCK",
                        "FAILED. YOU MUST USE THE",
                        "-b OPTION TO FSCK TO SPECIFY THE",
                        "LOCATION OF AN ALTERNATE",
                        "SUPER-BLOCK TO SUPPLY NEEDED",
                        "INFORMATION; SEE fsck(8).");
                  return(0);
            }
            pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
      }

#ifdef __APPLE__ 
      /* checking for free block map overlap PR2216969 */
      bufinit();
      cg0 = &cgrp;
      getblk(&cgblk, cgtod(&sblock, 0), sblock.fs_cgsize);
#if   REV_ENDIAN_FS
      cgblk.b_type=CYLGROUP;
      swapblock(&cgblk,0);
#endif      /* REV_ENDIAN_FS */
      if (!cg_chkmagic(cg0)) {
        pfatal("CG %d: BAD MAGIC NUMBER\n", 0);
        return(EEXIT);
      }
      if (cg0->cg_clustersumoff != 0) {
        /* Check for overlap */
        clustersumoff = cg0->cg_freeoff +
            howmany(sblock.fs_cpg * sblock.fs_spc / NSPF(&sblock), NBBY);
        clustersumoff = roundup(clustersumoff, sizeof(long));
        if (cg0->cg_clustersumoff < clustersumoff) {
          /* Overlap exists */
          skipclean=0;
        }
      }
      if (qflag) {
        if (skipclean == 0 || !sblock.fs_clean) {
            pwarn("FILESYSTEM DIRTY; SKIPPING CHECKS\n");
            return(DIRTYEXIT);  /* File system is dirty */
        }
        else {
            pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
            return(-1);   /* File system is clean */
        }
      }
#endif
      if (skipclean && sblock.fs_clean && !fflag) {
            pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
            return (-1);
      }
      maxfsblock = sblock.fs_size;
      maxino = sblock.fs_ncg * sblock.fs_ipg;
      /*
       * Check and potentially fix certain fields in the super block.
       */
      if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
            pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
            if (reply("SET TO DEFAULT") == 1) {
                  sblock.fs_optim = FS_OPTTIME;
                  sbdirty();
            }
      }
      if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
            pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
                  sblock.fs_minfree);
            if (reply("SET TO DEFAULT") == 1) {
                  sblock.fs_minfree = 10;
                  sbdirty();
            }
      }
      if (sblock.fs_interleave < 1 || 
          sblock.fs_interleave > sblock.fs_nsect) {
            pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
                  sblock.fs_interleave);
            sblock.fs_interleave = 1;
            if (preen)
                  printf(" (FIXED)\n");
            if (preen || reply("SET TO DEFAULT") == 1) {
                  sbdirty();
                  dirty(&asblk);
            }
      }
      if (sblock.fs_npsect < sblock.fs_nsect || 
          sblock.fs_npsect > sblock.fs_nsect*2) {
            pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
                  sblock.fs_npsect);
            sblock.fs_npsect = sblock.fs_nsect;
            if (preen)
                  printf(" (FIXED)\n");
            if (preen || reply("SET TO DEFAULT") == 1) {
                  sbdirty();
                  dirty(&asblk);
            }
      }
      if (sblock.fs_inodefmt >= FS_44INODEFMT) {
            newinofmt = 1;
      } else {
            sblock.fs_qbmask = ~sblock.fs_bmask;
            sblock.fs_qfmask = ~sblock.fs_fmask;
            newinofmt = 0;
      }
      /*
       * Convert to new inode format.
       */
      if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) {
            if (preen)
                  pwarn("CONVERTING TO NEW INODE FORMAT\n");
            else if (!reply("CONVERT TO NEW INODE FORMAT"))
                  return(0);
            doinglevel2++;
            sblock.fs_inodefmt = FS_44INODEFMT;
            sizepb = sblock.fs_bsize;
            sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
            for (i = 0; i < NIADDR; i++) {
                  sizepb *= NINDIR(&sblock);
                  sblock.fs_maxfilesize += sizepb;
            }
            sblock.fs_maxsymlinklen = MAXSYMLINKLEN;
            sblock.fs_qbmask = ~sblock.fs_bmask;
            sblock.fs_qfmask = ~sblock.fs_fmask;
            sbdirty();
            dirty(&asblk);
      }
      /*
       * Convert to new cylinder group format.
       */
      if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) {
            if (preen)
                  pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n");
            else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT"))
                  return(0);
            doinglevel1++;
            sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
            sblock.fs_nrpos = 8;
            sblock.fs_postbloff =
                (char *)(&sblock.fs_opostbl[0][0]) -
                (char *)(&sblock.fs_firstfield);
            sblock.fs_rotbloff = &sblock.fs_space[0] -
                (u_char *)(&sblock.fs_firstfield);
            sblock.fs_cgsize =
                  fragroundup(&sblock, CGSIZE(&sblock));
            sbdirty();
            dirty(&asblk);
      }
      if (asblk.b_dirty && !bflag) {
            memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
            flush(fswritefd, &asblk);
      }
      /*
       * read in the summary info.
       */
      asked = 0;
      sblock.fs_csp = calloc(1, sblock.fs_cssize);
      for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
            size = sblock.fs_cssize - i < sblock.fs_bsize ?
                sblock.fs_cssize - i : sblock.fs_bsize;
            if (bread(fsreadfd, (char *)sblock.fs_csp + i,
                fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
                size) != 0 && !asked) {
                  pfatal("BAD SUMMARY INFORMATION");
                  if (reply("CONTINUE") == 0)
                        exit(EEXIT);
                  asked++;
            }
#if   REV_ENDIAN_FS
            if (rev_endian)
                  byte_swap_ints((int *) ((char *)sblock.fs_csp + i), 
                        size / sizeof(int));
#endif      /* REV_ENDIAN_FS */
      }
      /*
       * allocate and initialize the necessary maps
       */
      bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short));
      blockmap = calloc((unsigned)bmapsize, sizeof (char));
      if (blockmap == NULL) {
            printf("cannot alloc %u bytes for blockmap\n",
                (unsigned)bmapsize);
            goto badsb;
      }
      statemap = calloc((unsigned)(maxino + 1), sizeof(char));
      if (statemap == NULL) {
            printf("cannot alloc %u bytes for statemap\n",
                (unsigned)(maxino + 1));
            goto badsb;
      }
      typemap = calloc((unsigned)(maxino + 1), sizeof(char));
      if (typemap == NULL) {
            printf("cannot alloc %u bytes for typemap\n",
                (unsigned)(maxino + 1));
            goto badsb;
      }
      lncntp = (short *)calloc((unsigned)(maxino + 1), sizeof(short));
      if (lncntp == NULL) {
            printf("cannot alloc %u bytes for lncntp\n", 
                (unsigned)(maxino + 1) * sizeof(short));
            goto badsb;
      }
      numdirs = sblock.fs_cstotal.cs_ndir;
      inplast = 0;
      listmax = numdirs + 10;
      inpsort = (struct inoinfo **)calloc((unsigned)listmax,
          sizeof(struct inoinfo *));
      inphead = (struct inoinfo **)calloc((unsigned)numdirs,
          sizeof(struct inoinfo *));
      if (inpsort == NULL || inphead == NULL) {
            printf("cannot alloc %u bytes for inphead\n", 
                (unsigned)numdirs * sizeof(struct inoinfo *));
            goto badsb;
      }

#ifndef __APPLE__
      bufinit();
#endif
      return (1);

badsb:
      ckfini(0);
      return (0);
}

/*
 * Read in the super block and its summary info.
 */
static int
readsb(listerr)
      int listerr;
{
      ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize;

      if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
            return (0);
      sblk.b_bno = super;
      sblk.b_size = SBSIZE;
      /*
       * run a few consistency checks of the super block
       */
      if (sblock.fs_magic != FS_MAGIC) {
#if   REV_ENDIAN_FS
            byte_swap_sbin(&sblock);
            if (sblock.fs_magic != FS_MAGIC) {
#endif      /* REV_ENDIAN_FS */
                  badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 
#if   REV_ENDIAN_FS
            } else {
                  printf("Reverse Byte order Filesystem Detected\n");
                  rev_endian=1;
            }
#endif      /* REV_ENDIAN_FS */
      } 
#if   REV_ENDIAN_FS
      else rev_endian=0;
#endif      /* REV_ENDIAN_FS */

      if (sblock.fs_ncg < 1)
            { badsb(listerr, "NCG OUT OF RANGE"); return (0); }
      if (sblock.fs_cpg < 1)
            { badsb(listerr, "CPG OUT OF RANGE"); return (0); }
      if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
          (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
            { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
      if (sblock.fs_sbsize > SBSIZE)
            { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
      /*
       * Compute block size that the filesystem is based on,
       * according to fsbtodb, and adjust superblock block number
       * so we can tell if this is an alternate later.
       */
      super *= dev_bsize;
      dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
      sblk.b_bno = super / dev_bsize;
      if (bflag) {
            havesb = 1;
            return (1);
      }
      /*
       * Set all possible fields that could differ, then do check
       * of whole super block against an alternate super block.
       * When an alternate super-block is specified this check is skipped.
       */
      getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
      if (asblk.b_errs)
            return (0);
#if REV_ENDIAN_FS
      if (rev_endian)
            byte_swap_sbin(&altsblock);
#endif      /* REV_ENDIAN_FS */
      altsblock.fs_firstfield = sblock.fs_firstfield;
      altsblock.fs_unused_1 = sblock.fs_unused_1;
      altsblock.fs_time = sblock.fs_time;
      altsblock.fs_cstotal = sblock.fs_cstotal;
      altsblock.fs_cgrotor = sblock.fs_cgrotor;
      altsblock.fs_fmod = sblock.fs_fmod;
      altsblock.fs_clean = sblock.fs_clean;
      altsblock.fs_ronly = sblock.fs_ronly;
      altsblock.fs_flags = sblock.fs_flags;
      altsblock.fs_maxcontig = sblock.fs_maxcontig;
      altsblock.fs_minfree = sblock.fs_minfree;
      altsblock.fs_optim = sblock.fs_optim;
      altsblock.fs_rotdelay = sblock.fs_rotdelay;
      altsblock.fs_maxbpg = sblock.fs_maxbpg;
      memmove(altsblock.fs_ocsp, sblock.fs_ocsp, sizeof sblock.fs_ocsp);
      altsblock.fs_contigdirs = sblock.fs_contigdirs;
      altsblock.fs_csp = sblock.fs_csp;
      altsblock.fs_maxcluster = sblock.fs_maxcluster;
      memmove(altsblock.fs_fsmnt, sblock.fs_fsmnt, sizeof sblock.fs_fsmnt);
      memmove(altsblock.fs_sparecon,
            sblock.fs_sparecon, sizeof sblock.fs_sparecon);
      altsblock.fs_avgfilesize = sblock.fs_avgfilesize;
      altsblock.fs_avgfpdir = sblock.fs_avgfpdir;
      /*
       * The following should not have to be copied.
       */
      altsblock.fs_fsbtodb = sblock.fs_fsbtodb;
      altsblock.fs_interleave = sblock.fs_interleave;
      altsblock.fs_npsect = sblock.fs_npsect;
      altsblock.fs_nrpos = sblock.fs_nrpos;
      altsblock.fs_state = sblock.fs_state;
      altsblock.fs_qbmask = sblock.fs_qbmask;
      altsblock.fs_qfmask = sblock.fs_qfmask;
      altsblock.fs_state = sblock.fs_state;
      altsblock.fs_maxfilesize = sblock.fs_maxfilesize;
      if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) {
            if (debug) {
                  long *nlp, *olp, *endlp;

                  printf("superblock mismatches\n");
                  nlp = (long *)&altsblock;
                  olp = (long *)&sblock;
                  endlp = olp + (sblock.fs_sbsize / sizeof *olp);
                  for ( ; olp < endlp; olp++, nlp++) {
                        if (*olp == *nlp)
                              continue;
                        printf("offset %d, original %d, alternate %d\n",
                            olp - (long *)&sblock, *olp, *nlp);
                  }
            }
            badsb(listerr,
            "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
            return (0);
      }
      havesb = 1;
      return (1);
}

static void
badsb(listerr, s)
      int listerr;
      char *s;
{

      if (!listerr)
            return;
      if (preen)
            printf("%s: ", cdevname);
      pfatal("BAD SUPER BLOCK: %s\n", s);
}

/*
 * Calculate a prototype superblock based on information in the disk label.
 * When done the cgsblock macro can be calculated and the fs_ncg field
 * can be used. Do NOT attempt to use other macros without verifying that
 * their needed information is available!
 */
static int
calcsb(dev, devfd, fs)
      char *dev;
      int devfd;
      register struct fs *fs;
{
      register struct disklabel *lp;
      register struct partition *pp;
      int i;

      lp = getdisklabel(dev, devfd);
      pp = &lp->d_partitions[0];
      if (pp->p_fstype != FS_BSDFFS) {
            pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n",
                  dev, pp->p_fstype < FSMAXTYPES ?
                  fstypenames[pp->p_fstype] : "unknown");
            return (0);
      }
      memset(fs, 0, sizeof(struct fs));
      fs->fs_fsize = pp->p_fsize;
//    fs->fs_frag = pp->p_frag;
      fs->fs_cpg = pp->p_cpg;
      fs->fs_size = pp->p_size;
      fs->fs_ntrak = lp->d_ntracks;
      fs->fs_nsect = lp->d_nsectors;
#warning fix this
//    fs->fs_spc = lp->d_secpercyl;
      fs->fs_nspf = fs->fs_fsize / lp->d_secsize;
#ifdef __APPLE__
#warning verify this change
      fs->fs_sblkno = SBOFF/secsize;
#else
      fs->fs_sblkno = roundup(
            howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
            fs->fs_frag);
#endif
      fs->fs_cgmask = 0xffffffff;
      for (i = fs->fs_ntrak; i > 1; i >>= 1)
            fs->fs_cgmask <<= 1;
      if (!POWEROF2(fs->fs_ntrak))
            fs->fs_cgmask <<= 1;
      fs->fs_cgoffset = roundup(
            howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag);
      fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs);
      fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg);
      for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
            fs->fs_fsbtodb++;
      dev_bsize = lp->d_secsize;
      return (1);
}
static struct disklabel *
getdisklabel(s, fd)
      char *s;
      int   fd;
{
      static struct disklabel lab;
#ifdef __APPLE__
      if (dkdisklabel(fd, &lab) < 0) 
#else
      if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) 
#endif
      {
            if (s == NULL)
                  return ((struct disklabel *)NULL);
            pwarn("ioctl (GCINFO): %s\n", strerror(errno));
            errx(EEXIT, "%s: can't read disk label", s);
      }
      return (&lab);
}

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