sbin/fsck_ffs/main.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 copyright[] =
  33 "@(#) Copyright (c) 1980, 1986, 1993\n\
  34         The Regents of the University of California.  All rights reserved.\n";
  35 #endif /* not lint */
  36
  37 #ifndef lint
  38 static char sccsid[] = "@(#)main.c      8.6 (Berkeley) 5/14/95";
  39 #endif /* not lint */
  40 #endif
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 #include <sys/param.h>
  45 #include <sys/stat.h>
  46 #include <sys/file.h>
  47 #include <sys/time.h>
  48 #include <sys/mount.h>
  49 #include <sys/resource.h>
  50 #include <sys/sysctl.h>
  51 #include <sys/disklabel.h>
  52
  53 #include <ufs/ufs/dinode.h>
  54 #include <ufs/ufs/ufsmount.h>
  55 #include <ufs/ffs/fs.h>
  56
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <fstab.h>
  60 #include <grp.h>
  61 #include <paths.h>
  62 #include <stdint.h>
  63 #include <string.h>
  64
  65 #include "fsck.h"
  66
  67 static void usage(void) __dead2;
  68 static int argtoi(int flag, const char *req, const char *str, int base);
  69 static int checkfilesys(char *filesys);
  70 static struct statfs *getmntpt(const char *);
  71
  72 int
  73 main(int argc, char *argv[])
  74 {
  75         int ch;
  76         struct rlimit rlimit;
  77         struct itimerval itimerval;
  78         int ret = 0;
  79
  80         sync();
  81         skipclean = 1;
  82         while ((ch = getopt(argc, argv, "b:Bc:dfFm:npy")) != -1) {
  83                 switch (ch) {
  84                 case 'b':
  85                         skipclean = 0;
  86                         bflag = argtoi('b', "number", optarg, 10);
  87                         printf("Alternate super block location: %d\n", bflag);
  88                         break;
  89
  90                 case 'B':
  91                         bkgrdflag = 1;
  92                         break;
  93
  94                 case 'c':
  95                         skipclean = 0;
  96                         cvtlevel = argtoi('c', "conversion level", optarg, 10);
  97                         if (cvtlevel < 3)
  98                                 errx(EEXIT, "cannot do level %d conversion",
  99                                     cvtlevel);
 100                         break;
 101
 102                 case 'd':
 103                         debug++;
 104                         break;
 105
 106                 case 'f':
 107                         skipclean = 0;
 108                         break;
 109
 110                 case 'F':
 111                         bkgrdcheck = 1;
 112                         break;
 113
 114                 case 'm':
 115                         lfmode = argtoi('m', "mode", optarg, 8);
 116                         if (lfmode &~ 07777)
 117                                 errx(EEXIT, "bad mode to -m: %o", lfmode);
 118                         printf("** lost+found creation mode %o\n", lfmode);
 119                         break;
 120
 121                 case 'n':
 122                         nflag++;
 123                         yflag = 0;
 124                         break;
 125
 126                 case 'p':
 127                         preen++;
 128                         break;
 129
 130                 case 'y':
 131                         yflag++;
 132                         nflag = 0;
 133                         break;
 134
 135                 default:
 136                         usage();
 137                 }
 138         }
 139         argc -= optind;
 140         argv += optind;
 141
 142         if (!argc)
 143                 usage();
 144
 145         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 146                 (void)signal(SIGINT, catch);
 147         if (preen)
 148                 (void)signal(SIGQUIT, catchquit);
 149         signal(SIGINFO, infohandler);
 150         if (bkgrdflag) {
 151                 signal(SIGALRM, alarmhandler);
 152                 itimerval.it_interval.tv_sec = 5;
 153                 itimerval.it_interval.tv_usec = 0;
 154                 itimerval.it_value.tv_sec = 5;
 155                 itimerval.it_value.tv_usec = 0;
 156                 setitimer(ITIMER_REAL, &itimerval, NULL);
 157         }
 158         /*
 159          * Push up our allowed memory limit so we can cope
 160          * with huge file systems.
 161          */
 162         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 163                 rlimit.rlim_cur = rlimit.rlim_max;
 164                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 165         }
 166         while (argc-- > 0)
 167                 (void)checkfilesys(*argv++);
 168
 169         if (returntosingle)
 170                 ret = 2;
 171         exit(ret);
 172 }
 173
 174 static int
 175 argtoi(int flag, const char *req, const char *str, int base)
 176 {
 177         char *cp;
 178         int ret;
 179
 180         ret = (int)strtol(str, &cp, base);
 181         if (cp == str || *cp)
 182                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 183         return (ret);
 184 }
 185
 186 /*
 187  * Check the specified file system.
 188  */
 189 /* ARGSUSED */
 190 static int
 191 checkfilesys(char *filesys)
 192 {
 193         ufs2_daddr_t n_ffree, n_bfree;
 194         struct ufs_args args;
 195         struct dups *dp;
 196         struct statfs *mntp;
 197         struct stat snapdir;
 198         struct group *grp;
 199         ufs2_daddr_t blks;
 200         int cylno, ret;
 201         ino_t files;
 202         size_t size;
 203
 204         cdevname = filesys;
 205         if (debug && preen)
 206                 pwarn("starting\n");
 207         /*
 208          * Make best effort to get the disk name. Check first to see
 209          * if it is listed among the mounted file systems. Failing that
 210          * check to see if it is listed in /etc/fstab.
 211          */
 212         mntp = getmntpt(filesys);
 213         if (mntp != NULL)
 214                 filesys = mntp->f_mntfromname;
 215         else
 216                 filesys = blockcheck(filesys);
 217         /*
 218          * If -F flag specified, check to see whether a background check
 219          * is possible and needed. If possible and needed, exit with
 220          * status zero. Otherwise exit with status non-zero. A non-zero
 221          * exit status will cause a foreground check to be run.
 222          */
 223         sblock_init();
 224         if (bkgrdcheck) {
 225                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 226                         exit(3);        /* Cannot read superblock */
 227                 close(fsreadfd);
 228                 if (sblock.fs_flags & FS_NEEDSFSCK)
 229                         exit(4);        /* Earlier background failed */
 230                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 231                         exit(5);        /* Not running soft updates */
 232                 size = MIBSIZE;
 233                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 234                         exit(6);        /* Lacks kernel support */
 235                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 236                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 237                         exit(7);        /* Filesystem clean, report it now */
 238                 exit(0);
 239         }
 240         if (preen && skipclean) {
 241                 /*
 242                  * If file system is gjournaled, check it here.
 243                  */
 244                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 245                         exit(3);        /* Cannot read superblock */
 246                 close(fsreadfd);
 247                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 248                         //printf("GJournaled file system detected on %s.\n",
 249                         //    filesys);
 250                         if (sblock.fs_clean == 1) {
 251                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 252                                 exit(0);
 253                         }
 254                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 255                                 gjournal_check(filesys);
 256                                 exit(0);
 257                         } else {
 258                                 pfatal("UNEXPECTED INCONSISTENCY, %s\n",
 259                                     "CANNOT RUN FAST FSCK\n");
 260                         }
 261                 }
 262         }
 263         /*
 264          * If we are to do a background check:
 265          *      Get the mount point information of the file system
 266          *      create snapshot file
 267          *      return created snapshot file
 268          *      if not found, clear bkgrdflag and proceed with normal fsck
 269          */
 270         if (bkgrdflag) {
 271                 if (mntp == NULL) {
 272                         bkgrdflag = 0;
 273                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 274                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 275                         bkgrdflag = 0;
 276                         pfatal("NOT USING SOFT UPDATES, %s\n",
 277                             "CANNOT RUN IN BACKGROUND");
 278                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 279                         bkgrdflag = 0;
 280                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 281                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 282                         if (readsb(0) != 0) {
 283                                 if (sblock.fs_flags & FS_NEEDSFSCK) {
 284                                         bkgrdflag = 0;
 285                                         pfatal("UNEXPECTED INCONSISTENCY, %s\n",
 286                                             "CANNOT RUN IN BACKGROUND\n");
 287                                 }
 288                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 289                                     skipclean && preen) {
 290                                         /*
 291                                          * file system is clean;
 292                                          * skip snapshot and report it clean
 293                                          */
 294                                         pwarn("FILE SYSTEM CLEAN; %s\n",
 295                                             "SKIPPING CHECKS");
 296                                         goto clean;
 297                                 }
 298                         }
 299                         close(fsreadfd);
 300                 }
 301                 if (bkgrdflag) {
 302                         snprintf(snapname, sizeof snapname, "%s/.snap",
 303                             mntp->f_mntonname);
 304                         if (stat(snapname, &snapdir) < 0) {
 305                                 if (errno != ENOENT) {
 306                                         bkgrdflag = 0;
 307                                         pfatal("CANNOT FIND %s %s: %s, %s\n",
 308                                             "SNAPSHOT DIRECTORY",
 309                                             snapname, strerror(errno),
 310                                             "CANNOT RUN IN BACKGROUND");
 311                                 } else if ((grp = getgrnam("operator")) == 0 ||
 312                                     mkdir(snapname, 0770) < 0 ||
 313                                     chown(snapname, -1, grp->gr_gid) < 0 ||
 314                                     chmod(snapname, 0770) < 0) {
 315                                         bkgrdflag = 0;
 316                                         pfatal("CANNOT CREATE %s %s: %s, %s\n",
 317                                             "SNAPSHOT DIRECTORY",
 318                                             snapname, strerror(errno),
 319                                             "CANNOT RUN IN BACKGROUND");
 320                                 }
 321                         } else if (!S_ISDIR(snapdir.st_mode)) {
 322                                 bkgrdflag = 0;
 323                                 pfatal("%s IS NOT A DIRECTORY, %s\n", snapname,
 324                                     "CANNOT RUN IN BACKGROUND");
 325                         }
 326                 }
 327                 if (bkgrdflag) {
 328                         snprintf(snapname, sizeof snapname,
 329                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 330                         memset(&args, 0, sizeof args);
 331                         args.fspec = snapname;
 332                         while (mount("ffs", mntp->f_mntonname,
 333                             mntp->f_flags | MNT_UPDATE | MNT_SNAPSHOT,
 334                             &args) < 0) {
 335                                 if (errno == EEXIST && unlink(snapname) == 0)
 336                                         continue;
 337                                 bkgrdflag = 0;
 338                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s\n",
 339                                     snapname, strerror(errno));
 340                                 break;
 341                         }
 342                         if (bkgrdflag != 0)
 343                                 filesys = snapname;
 344                 }
 345         }
 346
 347         switch (setup(filesys)) {
 348         case 0:
 349                 if (preen)
 350                         pfatal("CAN'T CHECK FILE SYSTEM.");
 351                 return (0);
 352         case -1:
 353         clean:
 354                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 355                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 356                 printf("(%lld frags, %lld blocks, %.1f%% fragmentation)\n",
 357                     (long long)sblock.fs_cstotal.cs_nffree,
 358                     (long long)sblock.fs_cstotal.cs_nbfree,
 359                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 360                 return (0);
 361         }
 362
 363         /*
 364          * Cleared if any questions answered no. Used to decide if
 365          * the superblock should be marked clean.
 366          */
 367         resolved = 1;
 368         /*
 369          * 1: scan inodes tallying blocks used
 370          */
 371         if (preen == 0) {
 372                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 373                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 374                         printf("** Root file system\n");
 375                 printf("** Phase 1 - Check Blocks and Sizes\n");
 376         }
 377         pass1();
 378
 379         /*
 380          * 1b: locate first references to duplicates, if any
 381          */
 382         if (duplist) {
 383                 if (preen || usedsoftdep)
 384                         pfatal("INTERNAL ERROR: dups with -p");
 385                 printf("** Phase 1b - Rescan For More DUPS\n");
 386                 pass1b();
 387         }
 388
 389         /*
 390          * 2: traverse directories from root to mark all connected directories
 391          */
 392         if (preen == 0)
 393                 printf("** Phase 2 - Check Pathnames\n");
 394         pass2();
 395
 396         /*
 397          * 3: scan inodes looking for disconnected directories
 398          */
 399         if (preen == 0)
 400                 printf("** Phase 3 - Check Connectivity\n");
 401         pass3();
 402
 403         /*
 404          * 4: scan inodes looking for disconnected files; check reference counts
 405          */
 406         if (preen == 0)
 407                 printf("** Phase 4 - Check Reference Counts\n");
 408         pass4();
 409
 410         /*
 411          * 5: check and repair resource counts in cylinder groups
 412          */
 413         if (preen == 0)
 414                 printf("** Phase 5 - Check Cyl groups\n");
 415         pass5();
 416
 417         /*
 418          * print out summary statistics
 419          */
 420         n_ffree = sblock.fs_cstotal.cs_nffree;
 421         n_bfree = sblock.fs_cstotal.cs_nbfree;
 422         files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 423         blks = n_blks +
 424             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 425         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 426         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 427         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 428         if (bkgrdflag && (files > 0 || blks > 0)) {
 429                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 430                 pwarn("Reclaimed: %ld directories, %ld files, %lld fragments\n",
 431                     countdirs, (long)files - countdirs, (long long)blks);
 432         }
 433         pwarn("%ld files, %jd used, %ju free ",
 434             (long)n_files, (intmax_t)n_blks,
 435             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 436         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 437             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 438             n_ffree * 100.0 / sblock.fs_dsize);
 439         if (debug) {
 440                 if (files < 0)
 441                         printf("%d inodes missing\n", -files);
 442                 if (blks < 0)
 443                         printf("%lld blocks missing\n", -(long long)blks);
 444                 if (duplist != NULL) {
 445                         printf("The following duplicate blocks remain:");
 446                         for (dp = duplist; dp; dp = dp->next)
 447                                 printf(" %lld,", (long long)dp->dup);
 448                         printf("\n");
 449                 }
 450         }
 451         duplist = (struct dups *)0;
 452         muldup = (struct dups *)0;
 453         inocleanup();
 454         if (fsmodified) {
 455                 sblock.fs_time = time(NULL);
 456                 sbdirty();
 457         }
 458         if (cvtlevel && sblk.b_dirty) {
 459                 /*
 460                  * Write out the duplicate super blocks
 461                  */
 462                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 463                         blwrite(fswritefd, (char *)&sblock,
 464                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 465                             SBLOCKSIZE);
 466         }
 467         if (rerun)
 468                 resolved = 0;
 469
 470         /*
 471          * Check to see if the file system is mounted read-write.
 472          */
 473         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 474                 resolved = 0;
 475         ckfini(resolved);
 476
 477         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 478                 if (inostathead[cylno].il_stat != NULL)
 479                         free((char *)inostathead[cylno].il_stat);
 480         free((char *)inostathead);
 481         inostathead = NULL;
 482         if (fsmodified && !preen)
 483                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 484         if (rerun)
 485                 printf("\n***** PLEASE RERUN FSCK *****\n");
 486         if (mntp != NULL) {
 487                 /*
 488                  * We modified a mounted file system.  Do a mount update on
 489                  * it unless it is read-write, so we can continue using it
 490                  * as safely as possible.
 491                  */
 492                 if (mntp->f_flags & MNT_RDONLY) {
 493                         args.fspec = 0;
 494                         args.export.ex_flags = 0;
 495                         args.export.ex_root = 0;
 496                         ret = mount("ufs", mntp->f_mntonname,
 497                             mntp->f_flags | MNT_UPDATE | MNT_RELOAD, &args);
 498                         if (ret == 0)
 499                                 return (0);
 500                         pwarn("mount reload of '%s' failed: %s\n\n",
 501                             mntp->f_mntonname, strerror(errno));
 502                 }
 503                 if (!fsmodified)
 504                         return (0);
 505                 if (!preen)
 506                         printf("\n***** REBOOT NOW *****\n");
 507                 sync();
 508                 return (4);
 509         }
 510         return (0);
 511 }
 512
 513 /*
 514  * Get the mount point information for name.
 515  */
 516 static struct statfs *
 517 getmntpt(const char *name)
 518 {
 519         struct stat devstat, mntdevstat;
 520         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 521         char *ddevname;
 522         struct statfs *mntbuf, *statfsp;
 523         int i, mntsize, isdev;
 524
 525         if (stat(name, &devstat) != 0)
 526                 return (NULL);
 527         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 528                 isdev = 1;
 529         else
 530                 isdev = 0;
 531         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 532         for (i = 0; i < mntsize; i++) {
 533                 statfsp = &mntbuf[i];
 534                 ddevname = statfsp->f_mntfromname;
 535                 if (*ddevname != '/') {
 536                         strcpy(device, _PATH_DEV);
 537                         strcat(device, ddevname);
 538                         strcpy(statfsp->f_mntfromname, device);
 539                 }
 540                 if (isdev == 0) {
 541                         if (strcmp(name, statfsp->f_mntonname))
 542                                 continue;
 543                         return (statfsp);
 544                 }
 545                 if (stat(ddevname, &mntdevstat) == 0 &&
 546                     mntdevstat.st_rdev == devstat.st_rdev)
 547                         return (statfsp);
 548         }
 549         statfsp = NULL;
 550         return (statfsp);
 551 }
 552
 553 static void
 554 usage(void)
 555 {
 556         (void) fprintf(stderr,
 557             "usage: %s [-BFpfny] [-b block] [-c level] [-m mode] "
 558                         "filesystem ...\n",
 559             getprogname());
 560         exit(1);
 561 }