sbin/fsck_ffs/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. 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[] = "@(#)setup.c       8.10 (Berkeley) 5/9/95";
  33 #endif /* not lint */
  34 #endif
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40 #define FSTYPENAMES
  41 #include <sys/disklabel.h>
  42 #include <sys/file.h>
  43 #include <sys/sysctl.h>
  44
  45 #include <ufs/ufs/dinode.h>
  46 #include <ufs/ffs/fs.h>
  47
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <limits.h>
  52 #include <stdint.h>
  53 #include <string.h>
  54
  55 #include "fsck.h"
  56
  57 struct bufarea asblk;
  58 #define altsblock (*asblk.b_un.b_fs)
  59 #define POWEROF2(num)   (((num) & ((num) - 1)) == 0)
  60
  61 static void badsb(int listerr, const char *s);
  62
  63 /*
  64  * Read in a superblock finding an alternate if necessary.
  65  * Return 1 if successful, 0 if unsuccessful, -1 if file system
  66  * is already clean (ckclean and preen mode only).
  67  */
  68 int
  69 setup(char *dev)
  70 {
  71         long asked, i, j;
  72         long bmapsize;
  73         struct stat statb;
  74         size_t size;
  75
  76         havesb = 0;
  77         fswritefd = -1;
  78         cursnapshot = 0;
  79         if (stat(dev, &statb) < 0) {
  80                 printf("Can't stat %s: %s\n", dev, strerror(errno));
  81                 if (bkgrdflag) {
  82                         unlink(snapname);
  83                         bkgrdflag = 0;
  84                 }
  85                 return (0);
  86         }
  87         if ((statb.st_mode & S_IFMT) != S_IFCHR &&
  88             (statb.st_mode & S_IFMT) != S_IFBLK) {
  89                 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) {
  90                         unlink(snapname);
  91                         printf("background fsck lacks a snapshot\n");
  92                         exit(EEXIT);
  93                 }
  94                 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) {
  95                         cursnapshot = statb.st_ino;
  96                 } else {
  97                         if (cvtlevel == 0 ||
  98                             (statb.st_flags & SF_SNAPSHOT) == 0) {
  99                                 if (preen && bkgrdflag) {
 100                                         unlink(snapname);
 101                                         bkgrdflag = 0;
 102                                 }
 103                                 pfatal("%s is not a disk device", dev);
 104                                 if (reply("CONTINUE") == 0) {
 105                                         if (bkgrdflag) {
 106                                                 unlink(snapname);
 107                                                 bkgrdflag = 0;
 108                                         }
 109                                         return (0);
 110                                 }
 111                         } else {
 112                                 if (bkgrdflag) {
 113                                         unlink(snapname);
 114                                         bkgrdflag = 0;
 115                                 }
 116                                 pfatal("cannot convert a snapshot");
 117                                 exit(EEXIT);
 118                         }
 119                 }
 120         }
 121         if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
 122                 if (bkgrdflag) {
 123                         unlink(snapname);
 124                         bkgrdflag = 0;
 125                 }
 126                 printf("Can't open %s: %s\n", dev, strerror(errno));
 127                 return (0);
 128         }
 129         if (bkgrdflag) {
 130                 unlink(snapname);
 131                 size = MIBSIZE;
 132                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0||
 133                     sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0||
 134                     sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0||
 135                     sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 ||
 136                     sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) {
 137                         pfatal("kernel lacks background fsck support\n");
 138                         exit(EEXIT);
 139                 }
 140                 /*
 141                  * When kernel is lack of runtime bgfsck superblock summary
 142                  * adjustment functionality, it does not mean we can not
 143                  * continue, as old kernels will recompute the summary at
 144                  * mount time.  However, it will be an unexpected softupdates
 145                  * inconsistency if it turns out that the summary is still
 146                  * incorrect.  Set a flag so subsequent operation can know
 147                  * this.
 148                  */
 149                 bkgrdsumadj = 1;
 150                 if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 ||
 151                     sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 ||
 152                     sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 ||
 153                     sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 ||
 154                     sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, &size) < 0) {
 155                         bkgrdsumadj = 0;
 156                         pwarn("kernel lacks runtime superblock summary adjustment support");
 157                 }
 158                 cmd.version = FFS_CMD_VERSION;
 159                 cmd.handle = fsreadfd;
 160                 fswritefd = -1;
 161         }
 162         if (preen == 0)
 163                 printf("** %s", dev);
 164         if (bkgrdflag == 0 &&
 165             (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) {
 166                 fswritefd = -1;
 167                 if (preen)
 168                         pfatal("NO WRITE ACCESS");
 169                 printf(" (NO WRITE)");
 170         }
 171         if (preen == 0)
 172                 printf("\n");
 173         /*
 174          * Read in the superblock, looking for alternates if necessary
 175          */
 176         if (readsb(1) == 0) {
 177                 skipclean = 0;
 178                 if (bflag || preen)
 179                         return(0);
 180                 /* Looking for alternates is hard punt for now but retain structure */
 181                 return (0);
 182         }
 183         if (skipclean && ckclean && sblock.fs_clean) {
 184                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 185                 return (-1);
 186         }
 187         maxfsblock = sblock.fs_size;
 188         maxino = sblock.fs_ncg * sblock.fs_ipg;
 189         /*
 190          * Check and potentially fix certain fields in the super block.
 191          */
 192         if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
 193                 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
 194                 if (reply("SET TO DEFAULT") == 1) {
 195                         sblock.fs_optim = FS_OPTTIME;
 196                         sbdirty();
 197                 }
 198         }
 199         if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
 200                 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
 201                         sblock.fs_minfree);
 202                 if (reply("SET TO DEFAULT") == 1) {
 203                         sblock.fs_minfree = 10;
 204                         sbdirty();
 205                 }
 206         }
 207         if (sblock.fs_magic == FS_UFS1_MAGIC &&
 208             sblock.fs_old_inodefmt < FS_44INODEFMT) {
 209                 pwarn("Format of file system is too old.\n");
 210                 pwarn("Must update to modern format using a version of fsck\n");
 211                 pfatal("from before 2002 with the command ``fsck -c 2''\n");
 212                 exit(EEXIT);
 213         }
 214         if (asblk.b_dirty && !bflag) {
 215                 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
 216                 flush(fswritefd, &asblk);
 217         }
 218         /*
 219          * read in the summary info.
 220          */
 221         asked = 0;
 222         sblock.fs_csp = Calloc(1, sblock.fs_cssize);
 223         if (sblock.fs_csp == NULL) {
 224                 printf("cannot alloc %u bytes for cg summary info\n",
 225                     (unsigned)sblock.fs_cssize);
 226                 goto badsb;
 227         }
 228         for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
 229                 size = MIN(sblock.fs_cssize - i, sblock.fs_bsize);
 230                 readcnt[sblk.b_type]++;
 231                 if (blread(fsreadfd, (char *)sblock.fs_csp + i,
 232                     fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
 233                     size) != 0 && !asked) {
 234                         pfatal("BAD SUMMARY INFORMATION");
 235                         if (reply("CONTINUE") == 0) {
 236                                 ckfini(0);
 237                                 exit(EEXIT);
 238                         }
 239                         asked++;
 240                 }
 241         }
 242         /*
 243          * allocate and initialize the necessary maps
 244          */
 245         bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short));
 246         blockmap = Calloc((unsigned)bmapsize, sizeof (char));
 247         if (blockmap == NULL) {
 248                 printf("cannot alloc %u bytes for blockmap\n",
 249                     (unsigned)bmapsize);
 250                 goto badsb;
 251         }
 252         inostathead = Calloc(sblock.fs_ncg, sizeof(struct inostatlist));
 253         if (inostathead == NULL) {
 254                 printf("cannot alloc %u bytes for inostathead\n",
 255                     (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
 256                 goto badsb;
 257         }
 258         numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128);
 259         dirhash = numdirs;
 260         inplast = 0;
 261         listmax = numdirs + 10;
 262         inpsort = (struct inoinfo **)Calloc(listmax, sizeof(struct inoinfo *));
 263         inphead = (struct inoinfo **)Calloc(numdirs, sizeof(struct inoinfo *));
 264         if (inpsort == NULL || inphead == NULL) {
 265                 printf("cannot alloc %ju bytes for inphead\n",
 266                     (uintmax_t)numdirs * sizeof(struct inoinfo *));
 267                 goto badsb;
 268         }
 269         bufinit();
 270         if (sblock.fs_flags & FS_DOSOFTDEP)
 271                 usedsoftdep = 1;
 272         else
 273                 usedsoftdep = 0;
 274         return (1);
 275
 276 badsb:
 277         ckfini(0);
 278         return (0);
 279 }
 280
 281 /*
 282  * Possible superblock locations ordered from most to least likely.
 283  */
 284 static int sblock_try[] = SBLOCKSEARCH;
 285
 286 #define BAD_MAGIC_MSG \
 287 "The previous newfs operation on this volume did not complete.\n" \
 288 "You must complete newfs before mounting this volume.\n"
 289
 290 /*
 291  * Read in the super block and its summary info.
 292  */
 293 int
 294 readsb(int listerr)
 295 {
 296         ufs2_daddr_t super;
 297         int i;
 298
 299         if (bflag) {
 300                 super = bflag;
 301                 readcnt[sblk.b_type]++;
 302                 if ((blread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE)))
 303                         return (0);
 304                 if (sblock.fs_magic == FS_BAD_MAGIC) {
 305                         fprintf(stderr, BAD_MAGIC_MSG);
 306                         exit(11);
 307                 }
 308                 if (sblock.fs_magic != FS_UFS1_MAGIC &&
 309                     sblock.fs_magic != FS_UFS2_MAGIC) {
 310                         fprintf(stderr, "%jd is not a file system superblock\n",
 311                             bflag);
 312                         return (0);
 313                 }
 314         } else {
 315                 for (i = 0; sblock_try[i] != -1; i++) {
 316                         super = sblock_try[i] / dev_bsize;
 317                         readcnt[sblk.b_type]++;
 318                         if ((blread(fsreadfd, (char *)&sblock, super,
 319                             (long)SBLOCKSIZE)))
 320                                 return (0);
 321                         if (sblock.fs_magic == FS_BAD_MAGIC) {
 322                                 fprintf(stderr, BAD_MAGIC_MSG);
 323                                 exit(11);
 324                         }
 325                         if ((sblock.fs_magic == FS_UFS1_MAGIC ||
 326                              (sblock.fs_magic == FS_UFS2_MAGIC &&
 327                               sblock.fs_sblockloc == sblock_try[i])) &&
 328                             sblock.fs_ncg >= 1 &&
 329                             sblock.fs_bsize >= MINBSIZE &&
 330                             sblock.fs_sbsize >= roundup(sizeof(struct fs), dev_bsize))
 331                                 break;
 332                 }
 333                 if (sblock_try[i] == -1) {
 334                         fprintf(stderr, "Cannot find file system superblock\n");
 335                         return (0);
 336                 }
 337         }
 338         /*
 339          * Compute block size that the file system is based on,
 340          * according to fsbtodb, and adjust superblock block number
 341          * so we can tell if this is an alternate later.
 342          */
 343         super *= dev_bsize;
 344         dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
 345         sblk.b_bno = super / dev_bsize;
 346         sblk.b_size = SBLOCKSIZE;
 347         if (bflag)
 348                 goto out;
 349         /*
 350          * Compare all fields that should not differ in alternate super block.
 351          * When an alternate super-block is specified this check is skipped.
 352          */
 353         getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
 354         if (asblk.b_errs)
 355                 return (0);
 356         if (altsblock.fs_sblkno != sblock.fs_sblkno ||
 357             altsblock.fs_cblkno != sblock.fs_cblkno ||
 358             altsblock.fs_iblkno != sblock.fs_iblkno ||
 359             altsblock.fs_dblkno != sblock.fs_dblkno ||
 360             altsblock.fs_ncg != sblock.fs_ncg ||
 361             altsblock.fs_bsize != sblock.fs_bsize ||
 362             altsblock.fs_fsize != sblock.fs_fsize ||
 363             altsblock.fs_frag != sblock.fs_frag ||
 364             altsblock.fs_bmask != sblock.fs_bmask ||
 365             altsblock.fs_fmask != sblock.fs_fmask ||
 366             altsblock.fs_bshift != sblock.fs_bshift ||
 367             altsblock.fs_fshift != sblock.fs_fshift ||
 368             altsblock.fs_fragshift != sblock.fs_fragshift ||
 369             altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
 370             altsblock.fs_sbsize != sblock.fs_sbsize ||
 371             altsblock.fs_nindir != sblock.fs_nindir ||
 372             altsblock.fs_inopb != sblock.fs_inopb ||
 373             altsblock.fs_cssize != sblock.fs_cssize ||
 374             altsblock.fs_ipg != sblock.fs_ipg ||
 375             altsblock.fs_fpg != sblock.fs_fpg ||
 376             altsblock.fs_magic != sblock.fs_magic) {
 377                 if (listerr == 0)
 378                         return (0);
 379                 if (preen)
 380                         printf("%s: ", cdevname);
 381                 printf(
 382                     "VALUES IN SUPER BLOCK LSB=%jd DISAGREE WITH THOSE IN\n"
 383                     "FIRST ALTERNATE LSB=%jd\n",
 384                     sblk.b_bno, asblk.b_bno);
 385                 if (reply("IGNORE ALTERNATE SUPER BLOCK") == 0)
 386                         return (0);
 387         }
 388 out:
 389         /*
 390          * If not yet done, update UFS1 superblock with new wider fields.
 391          */
 392         if (sblock.fs_magic == FS_UFS1_MAGIC &&
 393             sblock.fs_maxbsize != sblock.fs_bsize) {
 394                 sblock.fs_maxbsize = sblock.fs_bsize;
 395                 sblock.fs_time = sblock.fs_old_time;
 396                 sblock.fs_size = sblock.fs_old_size;
 397                 sblock.fs_dsize = sblock.fs_old_dsize;
 398                 sblock.fs_csaddr = sblock.fs_old_csaddr;
 399                 sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir;
 400                 sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree;
 401                 sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree;
 402                 sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree;
 403         }
 404         havesb = 1;
 405         return (1);
 406 }
 407
 408 void
 409 sblock_init(void)
 410 {
 411
 412         fswritefd = -1;
 413         fsmodified = 0;
 414         lfdir = 0;
 415         initbarea(&sblk, BT_SUPERBLK);
 416         initbarea(&asblk, BT_SUPERBLK);
 417         sblk.b_un.b_buf = Malloc(SBLOCKSIZE);
 418         asblk.b_un.b_buf = Malloc(SBLOCKSIZE);
 419         if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
 420                 errx(EEXIT, "cannot allocate space for superblock");
 421         dev_bsize = secsize = DEV_BSIZE;
 422 }