sbin/fsck/setup.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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)setup.c  8.10 (Berkeley) 5/9/95
  34  * $FreeBSD: src/sbin/fsck/setup.c,v 1.17.2.4 2002/06/24 05:10:41 dillon Exp $
  35  * $DragonFly: src/sbin/fsck/setup.c,v 1.8 2007/05/20 20:29:01 dillon Exp $
  36  */
  37
  38 #define DKTYPENAMES
  39 #include <sys/param.h>
  40 #include <sys/stat.h>
  41 #include <sys/diskslice.h>
  42 #include <sys/file.h>
  43
  44 #include <vfs/ufs/dinode.h>
  45 #include <vfs/ufs/fs.h>
  46
  47 #include <ctype.h>
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <string.h>
  51
  52 #include "fsck.h"
  53
  54 struct bufarea asblk;
  55 #define altsblock (*asblk.b_un.b_fs)
  56 #define POWEROF2(num)   (((num) & ((num) - 1)) == 0)
  57
  58 static void badsb(int listerr, char *s);
  59 static int readsb(int listerr);
  60
  61 /*
  62  * Read in a superblock finding an alternate if necessary.
  63  * Return 1 if successful, 0 if unsuccessful, -1 if filesystem
  64  * is already clean (preen mode only).
  65  */
  66 int
  67 setup(char *dev)
  68 {
  69         long cg, size, asked, i, j;
  70         long skipclean, bmapsize;
  71         off_t sizepb;
  72         struct stat statb;
  73         struct fs proto;
  74
  75         havesb = 0;
  76         fswritefd = -1;
  77         skipclean = fflag ? 0 : preen;
  78         if (stat(dev, &statb) < 0) {
  79                 printf("Can't stat %s: %s\n", dev, strerror(errno));
  80                 return (0);
  81         }
  82         if ((statb.st_mode & S_IFMT) != S_IFCHR &&
  83             (statb.st_mode & S_IFMT) != S_IFBLK) {
  84                 pfatal("%s is not a disk device", dev);
  85                 if (reply("CONTINUE") == 0)
  86                         return (0);
  87         }
  88         if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
  89                 printf("Can't open %s: %s\n", dev, strerror(errno));
  90                 return (0);
  91         }
  92         if (preen == 0)
  93                 printf("** %s", dev);
  94         if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
  95                 fswritefd = -1;
  96                 if (preen)
  97                         pfatal("NO WRITE ACCESS");
  98                 printf(" (NO WRITE)");
  99         }
 100         if (preen == 0)
 101                 printf("\n");
 102         fsmodified = 0;
 103         lfdir = 0;
 104         initbarea(&sblk);
 105         initbarea(&asblk);
 106         sblk.b_un.b_buf = malloc(SBSIZE);
 107         asblk.b_un.b_buf = malloc(SBSIZE);
 108         if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
 109                 errx(EEXIT, "cannot allocate space for superblock");
 110
 111         /*
 112          * Figure out the device block size and the sector size.  The
 113          * block size is updated by readsb() later on.
 114          */
 115         {
 116                 struct partinfo pinfo;
 117
 118                 if (ioctl(fsreadfd, DIOCGPART, &pinfo) == 0) {
 119                         dev_bsize = secsize = pinfo.media_blksize;
 120                 } else {
 121                         dev_bsize = secsize = DEV_BSIZE;
 122                 }
 123         }
 124
 125         /*
 126          * Read in the superblock, looking for alternates if necessary
 127          */
 128         if (readsb(1) == 0) {
 129                 skipclean = 0;
 130                 if (bflag || preen)
 131                         return(0);
 132                 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
 133                         return (0);
 134                 bflag = 32;
 135                 if (readsb(0) == 0) {
 136                         printf(
 137                             "YOU MUST USE THE -b OPTION TO FSCK TO SPECIFY\n"
 138                             "THE LOCATION OF AN ALTERNATE SUPER-BLOCK TO\n"
 139                             "SUPPLY NEEDED INFORMATION; SEE fsck(8).");
 140                         bflag = 0;
 141                         return(0);
 142                 }
 143                 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
 144                 bflag = 0;
 145         }
 146         if (skipclean && sblock.fs_clean) {
 147                 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
 148                 return (-1);
 149         }
 150         maxfsblock = sblock.fs_size;
 151         maxino = sblock.fs_ncg * sblock.fs_ipg;
 152         /*
 153          * Check and potentially fix certain fields in the super block.
 154          */
 155         if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
 156                 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
 157                 if (reply("SET TO DEFAULT") == 1) {
 158                         sblock.fs_optim = FS_OPTTIME;
 159                         sbdirty();
 160                 }
 161         }
 162         if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
 163                 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
 164                         sblock.fs_minfree);
 165                 if (reply("SET TO DEFAULT") == 1) {
 166                         sblock.fs_minfree = 10;
 167                         sbdirty();
 168                 }
 169         }
 170         if (sblock.fs_interleave < 1 ||
 171             sblock.fs_interleave > sblock.fs_nsect) {
 172                 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
 173                         sblock.fs_interleave);
 174                 sblock.fs_interleave = 1;
 175                 if (preen)
 176                         printf(" (FIXED)\n");
 177                 if (preen || reply("SET TO DEFAULT") == 1) {
 178                         sbdirty();
 179                         dirty(&asblk);
 180                 }
 181         }
 182         if (sblock.fs_npsect < sblock.fs_nsect ||
 183             sblock.fs_npsect > sblock.fs_nsect*2) {
 184                 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
 185                         sblock.fs_npsect);
 186                 sblock.fs_npsect = sblock.fs_nsect;
 187                 if (preen)
 188                         printf(" (FIXED)\n");
 189                 if (preen || reply("SET TO DEFAULT") == 1) {
 190                         sbdirty();
 191                         dirty(&asblk);
 192                 }
 193         }
 194         if (sblock.fs_inodefmt >= FS_44INODEFMT) {
 195                 newinofmt = 1;
 196         } else {
 197                 sblock.fs_qbmask = ~sblock.fs_bmask;
 198                 sblock.fs_qfmask = ~sblock.fs_fmask;
 199                 /* This should match the kernel limit in ffs_oldfscompat(). */
 200                 sblock.fs_maxfilesize = (u_int64_t)1 << 39;
 201                 newinofmt = 0;
 202         }
 203         /*
 204          * Convert to new inode format.
 205          */
 206         if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) {
 207                 if (preen)
 208                         pwarn("CONVERTING TO NEW INODE FORMAT\n");
 209                 else if (!reply("CONVERT TO NEW INODE FORMAT"))
 210                         return(0);
 211                 doinglevel2++;
 212                 sblock.fs_inodefmt = FS_44INODEFMT;
 213                 sizepb = sblock.fs_bsize;
 214                 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
 215                 for (i = 0; i < NIADDR; i++) {
 216                         sizepb *= NINDIR(&sblock);
 217                         sblock.fs_maxfilesize += sizepb;
 218                 }
 219                 sblock.fs_maxsymlinklen = MAXSYMLINKLEN;
 220                 sblock.fs_qbmask = ~sblock.fs_bmask;
 221                 sblock.fs_qfmask = ~sblock.fs_fmask;
 222                 sbdirty();
 223                 dirty(&asblk);
 224         }
 225         /*
 226          * Convert to new cylinder group format.
 227          */
 228         if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) {
 229                 if (preen)
 230                         pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n");
 231                 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT"))
 232                         return(0);
 233                 doinglevel1++;
 234                 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
 235                 sblock.fs_nrpos = 8;
 236                 sblock.fs_postbloff =
 237                     (char *)(&sblock.fs_opostbl[0][0]) -
 238                     (char *)(&sblock.fs_firstfield);
 239                 sblock.fs_rotbloff = &sblock.fs_space[0] -
 240                     (u_char *)(&sblock.fs_firstfield);
 241                 sblock.fs_cgsize =
 242                         fragroundup(&sblock, CGSIZE(&sblock));
 243                 sbdirty();
 244                 dirty(&asblk);
 245         }
 246         if (asblk.b_dirty && !bflag) {
 247                 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
 248                 flush(fswritefd, &asblk);
 249         }
 250         /*
 251          * read in the summary info.
 252          */
 253         asked = 0;
 254         sblock.fs_csp = calloc(1, sblock.fs_cssize);
 255         for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
 256                 size = sblock.fs_cssize - i < sblock.fs_bsize ?
 257                     sblock.fs_cssize - i : sblock.fs_bsize;
 258                 if (bread(fsreadfd, (char *)sblock.fs_csp + i,
 259                     fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
 260                     size) != 0 && !asked) {
 261                         pfatal("BAD SUMMARY INFORMATION");
 262                         if (reply("CONTINUE") == 0) {
 263                                 ckfini(0);
 264                                 exit(EEXIT);
 265                         }
 266                         asked++;
 267                 }
 268         }
 269         /*
 270          * allocate and initialize the necessary maps
 271          */
 272         bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short));
 273         blockmap = calloc((unsigned)bmapsize, sizeof (char));
 274         if (blockmap == NULL) {
 275                 printf("cannot alloc %u bytes for blockmap\n",
 276                     (unsigned)bmapsize);
 277                 goto badsb;
 278         }
 279         inostathead = calloc((unsigned)(sblock.fs_ncg),
 280             sizeof(struct inostatlist));
 281         if (inostathead == NULL) {
 282                 printf("cannot alloc %u bytes for inostathead\n",
 283                     (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
 284                 goto badsb;
 285         }
 286         numdirs = sblock.fs_cstotal.cs_ndir;
 287
 288         /*
 289          * Calculate the directory hash table size.  Do not allocate
 290          * a ridiculous amount of memory if we have a lot of directories.
 291          */
 292         for (dirhash = 16; dirhash < numdirs; dirhash <<= 1)
 293                 ;
 294         if (dirhash > 1024*1024)
 295                 dirhash /= 8;
 296         dirhashmask = dirhash - 1;
 297
 298         if (numdirs == 0) {
 299                 printf("numdirs is zero, try using an alternate superblock\n");
 300                 goto badsb;
 301         }
 302         inplast = 0;
 303         listmax = numdirs + 10;
 304         inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
 305         inphead = calloc((unsigned)dirhash, sizeof(struct inoinfo *));
 306         if (inpsort == NULL || inphead == NULL) {
 307                 printf("cannot allocate base structures for %ld directories\n",
 308                         numdirs);
 309                 goto badsb;
 310         }
 311         bufinit();
 312         if (sblock.fs_flags & FS_DOSOFTDEP)
 313                 usedsoftdep = 1;
 314         else
 315                 usedsoftdep = 0;
 316         return (1);
 317
 318 badsb:
 319         ckfini(0);
 320         return (0);
 321 }
 322
 323 /*
 324  * Read in the super block and its summary info.
 325  */
 326 static int
 327 readsb(int listerr)
 328 {
 329         ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
 330
 331         if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
 332                 return (0);
 333         sblk.b_bno = super;
 334         sblk.b_size = SBSIZE;
 335         /*
 336          * run a few consistency checks of the super block
 337          */
 338         if (sblock.fs_magic != FS_MAGIC)
 339                 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
 340         if (sblock.fs_ncg < 1)
 341                 { badsb(listerr, "NCG OUT OF RANGE"); return (0); }
 342         if (sblock.fs_cpg < 1)
 343                 { badsb(listerr, "CPG OUT OF RANGE"); return (0); }
 344         if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
 345             (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
 346                 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
 347         if (sblock.fs_sbsize > SBSIZE)
 348                 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
 349         /*
 350          * Compute block size that the filesystem is based on,
 351          * according to fsbtodb, and adjust superblock block number
 352          * so we can tell if this is an alternate later.
 353          */
 354         super *= dev_bsize;
 355         dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
 356         sblk.b_bno = super / dev_bsize;
 357         if (bflag) {
 358                 havesb = 1;
 359                 return (1);
 360         }
 361         /*
 362          * Compare all fields that should not differ in alternate super block.
 363          * When an alternate super-block is specified this check is skipped.
 364          */
 365         getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
 366         if (asblk.b_errs)
 367                 return (0);
 368         if (altsblock.fs_sblkno != sblock.fs_sblkno ||
 369             altsblock.fs_cblkno != sblock.fs_cblkno ||
 370             altsblock.fs_iblkno != sblock.fs_iblkno ||
 371             altsblock.fs_dblkno != sblock.fs_dblkno ||
 372             altsblock.fs_cgoffset != sblock.fs_cgoffset ||
 373             altsblock.fs_cgmask != sblock.fs_cgmask ||
 374             altsblock.fs_ncg != sblock.fs_ncg ||
 375             altsblock.fs_bsize != sblock.fs_bsize ||
 376             altsblock.fs_fsize != sblock.fs_fsize ||
 377             altsblock.fs_frag != sblock.fs_frag ||
 378             altsblock.fs_bmask != sblock.fs_bmask ||
 379             altsblock.fs_fmask != sblock.fs_fmask ||
 380             altsblock.fs_bshift != sblock.fs_bshift ||
 381             altsblock.fs_fshift != sblock.fs_fshift ||
 382             altsblock.fs_fragshift != sblock.fs_fragshift ||
 383             altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
 384             altsblock.fs_sbsize != sblock.fs_sbsize ||
 385             altsblock.fs_nindir != sblock.fs_nindir ||
 386             altsblock.fs_inopb != sblock.fs_inopb ||
 387             altsblock.fs_cssize != sblock.fs_cssize ||
 388             altsblock.fs_cpg != sblock.fs_cpg ||
 389             altsblock.fs_ipg != sblock.fs_ipg ||
 390             altsblock.fs_fpg != sblock.fs_fpg ||
 391             altsblock.fs_magic != sblock.fs_magic) {
 392                 badsb(listerr,
 393                 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
 394                 return (0);
 395         }
 396         havesb = 1;
 397         return (1);
 398 }
 399
 400 static void
 401 badsb(int listerr, char *s)
 402 {
 403
 404         if (!listerr)
 405                 return;
 406         if (preen)
 407                 printf("%s: ", cdevname);
 408         pfatal("BAD SUPER BLOCK: %s\n", s);
 409 }
 410