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setup.c

/*
 * 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.
 * 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.
 */

#if 0
#ifndef lint
static const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sbin/fsck_ffs/setup.c,v 1.50 2006/10/31 22:06:56 pjd Exp $");

#include <sys/param.h>
#include <sys/stat.h>
#define FSTYPENAMES
#include <sys/disklabel.h>
#include <sys/file.h>
#include <sys/sysctl.h>

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

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

#include "fsck.h"

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

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

/*
 * Read in a superblock finding an alternate if necessary.
 * Return 1 if successful, 0 if unsuccessful, -1 if file system
 * is already clean (preen mode only).
 */
int
setup(char *dev)
{
      long cg, asked, i, j;
      long bmapsize;
      struct stat statb;
      struct fs proto;
      size_t size;

      havesb = 0;
      fswritefd = -1;
      cursnapshot = 0;
      if (stat(dev, &statb) < 0) {
            printf("Can't stat %s: %s\n", dev, strerror(errno));
            if (bkgrdflag) {
                  unlink(snapname);
                  bkgrdflag = 0;
            }
            return (0);
      }
      if ((statb.st_mode & S_IFMT) != S_IFCHR &&
          (statb.st_mode & S_IFMT) != S_IFBLK) {
            if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) {
                  unlink(snapname);
                  printf("background fsck lacks a snapshot\n");
                  exit(EEXIT);
            }
            if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) {
                  cursnapshot = statb.st_ino;
            } else {
                  if (cvtlevel == 0 ||
                      (statb.st_flags & SF_SNAPSHOT) == 0) {
                        if (preen && bkgrdflag) {
                              unlink(snapname);
                              bkgrdflag = 0;
                        }
                        pfatal("%s is not a disk device", dev);
                        if (reply("CONTINUE") == 0) {
                              if (bkgrdflag) {
                                    unlink(snapname);
                                    bkgrdflag = 0;
                              }
                              return (0);
                        }
                  } else {
                        if (bkgrdflag) {
                              unlink(snapname);
                              bkgrdflag = 0;
                        }
                        pfatal("cannot convert a snapshot");
                        exit(EEXIT);
                  }
            }
      }
      if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
            if (bkgrdflag) {
                  unlink(snapname);
                  bkgrdflag = 0;
            }
            printf("Can't open %s: %s\n", dev, strerror(errno));
            return (0);
      }
      if (bkgrdflag) {
            unlink(snapname);
            size = MIBSIZE;
            if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0||
                sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0||
                sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0||
                sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 ||
                sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) {
                  pfatal("kernel lacks background fsck support\n");
                  exit(EEXIT);
            }
            /*
             * When kernel is lack of runtime bgfsck superblock summary
             * adjustment functionality, it does not mean we can not
             * continue, as old kernels will recompute the summary at
             * mount time.  However, it will be an unexpected softupdates
             * inconsistency if it turns out that the summary is still
             * incorrect.  Set a flag so subsequent operation can know
             * this.
             */
            bkgrdsumadj = 1;
            if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 ||
                sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 ||
                sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 ||
                sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 ||
                sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, &size) < 0) {
                  bkgrdsumadj = 0;
                  pwarn("kernel lacks runtime superblock summary adjustment support");
            }
            cmd.version = FFS_CMD_VERSION;
            cmd.handle = fsreadfd;
            fswritefd = -1;
      }
      if (preen == 0)
            printf("** %s", dev);
      if (bkgrdflag == 0 &&
          (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) {
            fswritefd = -1;
            if (preen)
                  pfatal("NO WRITE ACCESS");
            printf(" (NO WRITE)");
      }
      if (preen == 0)
            printf("\n");
      /*
       * Read in the superblock, looking for alternates if necessary
       */
      if (readsb(1) == 0) {
            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).");
                  bflag = 0;
                  return(0);
            }
            pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
            bflag = 0;
      }
      if (skipclean && preen && sblock.fs_clean) {
            pwarn("FILE SYSTEM 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_magic == FS_UFS1_MAGIC &&
          sblock.fs_old_inodefmt < FS_44INODEFMT) {
            pwarn("Format of file system is too old.\n");
            pwarn("Must update to modern format using a version of fsck\n");
            pfatal("from before 2002 with the command ``fsck -c 2''\n");
            exit(EEXIT);
      }
      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);
      if (sblock.fs_csp == NULL) {
            printf("cannot alloc %u bytes for cg summary info\n",
                (unsigned)sblock.fs_cssize);
            goto badsb;
      }
      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 (blread(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) {
                        ckfini(0);
                        exit(EEXIT);
                  }
                  asked++;
            }
      }
      /*
       * allocate and initialize the necessary maps
       */
      bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short));
      blockmap = calloc((unsigned)bmapsize, sizeof (char));
      if (blockmap == NULL) {
            printf("cannot alloc %u bytes for blockmap\n",
                (unsigned)bmapsize);
            goto badsb;
      }
      inostathead = calloc((unsigned)(sblock.fs_ncg),
          sizeof(struct inostatlist));
      if (inostathead == NULL) {
            printf("cannot alloc %u bytes for inostathead\n",
                (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
            goto badsb;
      }
      numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128);
      dirhash = numdirs;
      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 %ju bytes for inphead\n",
                (uintmax_t)numdirs * sizeof(struct inoinfo *));
            goto badsb;
      }
      bufinit();
      if (sblock.fs_flags & FS_DOSOFTDEP)
            usedsoftdep = 1;
      else
            usedsoftdep = 0;
      return (1);

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

/*
 * Possible superblock locations ordered from most to least likely.
 */
static int sblock_try[] = SBLOCKSEARCH;

#define BAD_MAGIC_MSG \
"The previous newfs operation on this volume did not complete.\n" \
"You must complete newfs before mounting this volume.\n"

/*
 * Read in the super block and its summary info.
 */
int
readsb(int listerr)
{
      ufs2_daddr_t super;
      int i;

      if (bflag) {
            super = bflag;
            if ((blread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE)))
                  return (0);
            if (sblock.fs_magic == FS_BAD_MAGIC) {
                  fprintf(stderr, BAD_MAGIC_MSG);
                  exit(11);
            }
            if (sblock.fs_magic != FS_UFS1_MAGIC &&
                sblock.fs_magic != FS_UFS2_MAGIC) {
                  fprintf(stderr, "%d is not a file system superblock\n",
                      bflag);
                  return (0);
            }
      } else {
            for (i = 0; sblock_try[i] != -1; i++) {
                  super = sblock_try[i] / dev_bsize;
                  if ((blread(fsreadfd, (char *)&sblock, super,
                      (long)SBLOCKSIZE)))
                        return (0);
                  if (sblock.fs_magic == FS_BAD_MAGIC) {
                        fprintf(stderr, BAD_MAGIC_MSG);
                        exit(11);
                  }
                  if ((sblock.fs_magic == FS_UFS1_MAGIC ||
                       (sblock.fs_magic == FS_UFS2_MAGIC &&
                        sblock.fs_sblockloc == sblock_try[i])) &&
                      sblock.fs_ncg >= 1 &&
                      sblock.fs_bsize >= MINBSIZE &&
                      sblock.fs_bsize >= sizeof(struct fs))
                        break;
            }
            if (sblock_try[i] == -1) {
                  fprintf(stderr, "Cannot find file system superblock\n");
                  return (0);
            }
      }
      /*
       * Compute block size that the file system 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;
      sblk.b_size = SBLOCKSIZE;
      if (bflag)
            goto out;
      /*
       * Compare all fields that should not differ in 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 (altsblock.fs_sblkno != sblock.fs_sblkno ||
          altsblock.fs_cblkno != sblock.fs_cblkno ||
          altsblock.fs_iblkno != sblock.fs_iblkno ||
          altsblock.fs_dblkno != sblock.fs_dblkno ||
          altsblock.fs_ncg != sblock.fs_ncg ||
          altsblock.fs_bsize != sblock.fs_bsize ||
          altsblock.fs_fsize != sblock.fs_fsize ||
          altsblock.fs_frag != sblock.fs_frag ||
          altsblock.fs_bmask != sblock.fs_bmask ||
          altsblock.fs_fmask != sblock.fs_fmask ||
          altsblock.fs_bshift != sblock.fs_bshift ||
          altsblock.fs_fshift != sblock.fs_fshift ||
          altsblock.fs_fragshift != sblock.fs_fragshift ||
          altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
          altsblock.fs_sbsize != sblock.fs_sbsize ||
          altsblock.fs_nindir != sblock.fs_nindir ||
          altsblock.fs_inopb != sblock.fs_inopb ||
          altsblock.fs_cssize != sblock.fs_cssize ||
          altsblock.fs_ipg != sblock.fs_ipg ||
          altsblock.fs_fpg != sblock.fs_fpg ||
          altsblock.fs_magic != sblock.fs_magic) {
            badsb(listerr,
            "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
            return (0);
      }
out:
      /*
       * If not yet done, update UFS1 superblock with new wider fields.
       */
      if (sblock.fs_magic == FS_UFS1_MAGIC &&
          sblock.fs_maxbsize != sblock.fs_bsize) {
            sblock.fs_maxbsize = sblock.fs_bsize;
            sblock.fs_time = sblock.fs_old_time;
            sblock.fs_size = sblock.fs_old_size;
            sblock.fs_dsize = sblock.fs_old_dsize;
            sblock.fs_csaddr = sblock.fs_old_csaddr;
            sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir;
            sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree;
            sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree;
            sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree;
      }
      havesb = 1;
      return (1);
}

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

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

void
sblock_init(void)
{
      struct disklabel *lp;

      fswritefd = -1;
      fsmodified = 0;
      lfdir = 0;
      initbarea(&sblk);
      initbarea(&asblk);
      sblk.b_un.b_buf = malloc(SBLOCKSIZE);
      asblk.b_un.b_buf = malloc(SBLOCKSIZE);
      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;
}

/*
 * 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(char *dev, int devfd, struct fs *fs)
{
      struct disklabel *lp;
      struct partition *pp;
      char *cp;
      int i, nspf;

      cp = strchr(dev, '\0') - 1;
      if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) {
            pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
            return (0);
      }
      lp = getdisklabel(dev, devfd);
      if (isdigit(*cp))
            pp = &lp->d_partitions[0];
      else
            pp = &lp->d_partitions[*cp - 'a'];
      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);
      }
      if (pp->p_fsize == 0 || pp->p_frag == 0 ||
          pp->p_cpg == 0 || pp->p_size == 0) {
            pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n",
                dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype],
                pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size);
            return (0);
      }
      memset(fs, 0, sizeof(struct fs));
      fs->fs_fsize = pp->p_fsize;
      fs->fs_frag = pp->p_frag;
      fs->fs_size = pp->p_size;
      fs->fs_sblkno = roundup(
            howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
            fs->fs_frag);
      nspf = fs->fs_fsize / lp->d_secsize;
      for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1)
            fs->fs_fsbtodb++;
      dev_bsize = lp->d_secsize;
      if (fs->fs_magic == FS_UFS2_MAGIC) {
            fs->fs_fpg = pp->p_cpg;
            fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg);
      } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ {
            fs->fs_old_cpg = pp->p_cpg;
            fs->fs_old_cgmask = 0xffffffff;
            for (i = lp->d_ntracks; i > 1; i >>= 1)
                  fs->fs_old_cgmask <<= 1;
            if (!POWEROF2(lp->d_ntracks))
                  fs->fs_old_cgmask <<= 1;
            fs->fs_old_cgoffset = roundup(howmany(lp->d_nsectors, nspf),
                fs->fs_frag);
            fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf;
            fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl,
                fs->fs_old_cpg);
      }
      return (1);
}

static struct disklabel *
getdisklabel(char *s, int fd)
{
      static struct disklabel lab;

      if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
            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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