sbin/fsck/fsck.c

   1 /*      $NetBSD: fsck.c,v 1.46 2007/07/17 20:12:40 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 1996 Christos Zoulas. All rights reserved.
   5  * Copyright (c) 1980, 1989, 1993, 1994
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * From: @(#)mount.c    8.19 (Berkeley) 4/19/94
  33  * From: NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 cgd Exp
  34  *
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifndef lint
  39 __RCSID("$NetBSD: fsck.c,v 1.46 2007/07/17 20:12:40 christos Exp $");
  40 #endif /* not lint */
  41
  42 #include <sys/param.h>
  43 #include <sys/mount.h>
  44 #include <sys/queue.h>
  45 #include <sys/wait.h>
  46 #define FSTYPENAMES
  47 #define FSCKNAMES
  48 #include <sys/disk.h>
  49 #include <sys/disklabel.h>
  50 #include <sys/ioctl.h>
  51
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <fstab.h>
  55 #include <fcntl.h>
  56 #include <paths.h>
  57 #include <signal.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62 #include <util.h>
  63
  64 #include "pathnames.h"
  65 #include "fsutil.h"
  66 #include "exitvalues.h"
  67
  68 static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
  69
  70 TAILQ_HEAD(fstypelist, entry) opthead, selhead;
  71
  72 struct entry {
  73         char *type;
  74         char *options;
  75         TAILQ_ENTRY(entry) entries;
  76 };
  77
  78 static int maxrun = 0;
  79 static char *options = NULL;
  80 static int flags = 0;
  81
  82 static int checkfs(const char *, const char *, const char *, void *, pid_t *);
  83 static int selected(const char *);
  84 static void addoption(char *);
  85 static const char *getoptions(const char *);
  86 static void addentry(struct fstypelist *, const char *, const char *);
  87 static void maketypelist(char *);
  88 static void catopt(char **, const char *);
  89 static void mangle(char *, int *, const char ** volatile *, int *);
  90 static const char *getfslab(const char *);
  91 static void usage(void);
  92 static void *isok(struct fstab *);
  93
  94 int
  95 main(int argc, char *argv[])
  96 {
  97         struct fstab *fs;
  98         int i, rval;
  99         const char *vfstype = NULL;
 100         char globopt[3];
 101         int ret = FSCK_EXIT_OK;
 102
 103         globopt[0] = '-';
 104         globopt[2] = '\0';
 105
 106         TAILQ_INIT(&selhead);
 107         TAILQ_INIT(&opthead);
 108
 109         while ((i = getopt(argc, argv, "dfl:nPpqT:t:vy")) != -1) {
 110                 switch (i) {
 111                 case 'd':
 112                         flags |= CHECK_DEBUG;
 113                         continue;
 114
 115                 case 'f':
 116                         flags |= CHECK_FORCE;
 117                         break;
 118
 119                 case 'n':
 120                         flags |= CHECK_NOFIX;
 121                         break;
 122
 123                 case 'p':
 124                         flags |= CHECK_PREEN;
 125                         break;
 126
 127                 case 'P':
 128                         flags |= CHECK_PROGRESS;
 129                         break;
 130
 131                 case 'q':
 132                         break;
 133
 134                 case 'l':
 135                         maxrun = atoi(optarg);
 136                         continue;
 137
 138                 case 'T':
 139                         if (*optarg)
 140                                 addoption(optarg);
 141                         continue;
 142
 143                 case 't':
 144                         if (TAILQ_FIRST(&selhead) != NULL)
 145                                 errx(1, "only one -t option may be specified.");
 146
 147                         maketypelist(optarg);
 148                         vfstype = optarg;
 149                         continue;
 150
 151                 case 'v':
 152                         flags |= CHECK_VERBOSE;
 153                         continue;
 154
 155                 case 'y':
 156                         break;
 157
 158                 case '?':
 159                 default:
 160                         usage();
 161                         /* NOTREACHED */
 162                 }
 163
 164                 /* Pass option to fsck_xxxfs */
 165                 globopt[1] = i;
 166                 catopt(&options, globopt);
 167         }
 168
 169         /* Don't do progress meters if we're debugging. */
 170         if (flags & CHECK_DEBUG)
 171                 flags &= ~CHECK_PROGRESS;
 172
 173         /*
 174          * If progress meters are being used, force max parallel to 1
 175          * so the progress meter outputs don't interfere with one another.
 176          */
 177         if (flags & CHECK_PROGRESS)
 178                 maxrun = 1;
 179
 180         argc -= optind;
 181         argv += optind;
 182
 183         if (argc == 0)
 184                 return checkfstab(flags, maxrun, isok, checkfs);
 185
 186 #define BADTYPE(type)                                                   \
 187         (strcmp(type, FSTAB_RO) &&                                      \
 188             strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
 189
 190
 191         for (; argc--; argv++) {
 192                 const char *spec, *type, *cp;
 193                 char    device[MAXPATHLEN];
 194
 195                 spec = *argv;
 196                 cp = strrchr(spec, '/');
 197                 if (cp == 0) {
 198                         (void)snprintf(device, sizeof(device), "%s%s",
 199                                 _PATH_DEV, spec);
 200                         spec = device;
 201                 }
 202                 if ((fs = getfsfile(spec)) == NULL &&
 203                     (fs = getfsspec(spec)) == NULL) {
 204                         if (vfstype == NULL)
 205                                 vfstype = getfslab(spec);
 206                         type = vfstype;
 207                 }
 208                 else {
 209                         spec = fs->fs_spec;
 210                         type = fs->fs_vfstype;
 211                         if (BADTYPE(fs->fs_type))
 212                                 errx(FSCK_EXIT_CHECK_FAILED,
 213                                     "%s has unknown file system type.",
 214                                     spec);
 215                 }
 216
 217                 rval = checkfs(type, blockcheck(spec), *argv, NULL, NULL);
 218                 if (rval > ret)
 219                         ret = rval;
 220         }
 221
 222         return ret;
 223 }
 224
 225
 226 static void *
 227 isok(struct fstab *fs)
 228 {
 229
 230         if (fs->fs_passno == 0)
 231                 return NULL;
 232
 233         if (BADTYPE(fs->fs_type))
 234                 return NULL;
 235
 236         if (!selected(fs->fs_vfstype))
 237                 return NULL;
 238
 239         return fs;
 240 }
 241
 242
 243 static int
 244 checkfs(const char *vfst, const char *spec, const char *mntpt, void *auxarg,
 245     pid_t *pidp)
 246 {
 247         /* List of directories containing fsck_xxx subcommands. */
 248         static const char *edirs[] = {
 249 #ifdef RESCUEDIR
 250                 RESCUEDIR,
 251 #endif
 252                 _PATH_SBIN,
 253                 _PATH_USRSBIN,
 254                 NULL
 255         };
 256         const char ** volatile argv, **edir;
 257         const char * volatile vfstype = vfst;
 258         pid_t pid;
 259         int argc, i, status, maxargc;
 260         char *optb;
 261         char *volatile optbuf;
 262         char execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
 263         const char *extra = getoptions(vfstype);
 264
 265         if (!strcmp(vfstype, "ufs"))
 266                 vfstype = MOUNT_UFS;
 267
 268         optb = NULL;
 269         if (options)
 270                 catopt(&optb, options);
 271         if (extra)
 272                 catopt(&optb, extra);
 273         optbuf = optb;
 274
 275         maxargc = 64;
 276         argv = emalloc(sizeof(char *) * maxargc);
 277
 278         (void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
 279         argc = 0;
 280         argv[argc++] = execbase;
 281         if (optbuf)
 282                 mangle(optbuf, &argc, &argv, &maxargc);
 283         argv[argc++] = spec;
 284         argv[argc] = NULL;
 285
 286         if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
 287                 (void)printf("start %s %swait", mntpt,
 288                         pidp ? "no" : "");
 289                 for (i = 0; i < argc; i++)
 290                         (void)printf(" %s", argv[i]);
 291                 (void)printf("\n");
 292         }
 293
 294         switch (pid = vfork()) {
 295         case -1:                                /* Error. */
 296                 warn("vfork");
 297                 if (optbuf)
 298                         free(optbuf);
 299                 free(argv);
 300                 return FSCK_EXIT_CHECK_FAILED;
 301
 302         case 0:                                 /* Child. */
 303                 if ((flags & CHECK_FORCE) == 0) {
 304                         struct statvfs  sfs;
 305
 306                                 /*
 307                                  * if mntpt is a mountpoint of a mounted file
 308                                  * system and it's mounted read-write, skip it
 309                                  * unless -f is given.
 310                                  */
 311                         if ((statvfs(mntpt, &sfs) == 0) &&
 312                             (strcmp(mntpt, sfs.f_mntonname) == 0) &&
 313                             ((sfs.f_flag & MNT_RDONLY) == 0)) {
 314                                 printf(
 315                 "%s: file system is mounted read-write on %s; not checking\n",
 316                                     spec, mntpt);
 317                                 if ((flags & CHECK_PREEN) && auxarg != NULL)
 318                                         _exit(FSCK_EXIT_OK);    /* fsck -p */
 319                                 else
 320                                         _exit(FSCK_EXIT_CHECK_FAILED);  /* fsck [[-p] ...] */
 321                         }
 322                 }
 323
 324                 if (flags & CHECK_DEBUG)
 325                         _exit(FSCK_EXIT_OK);
 326
 327                 /* Go find an executable. */
 328                 edir = edirs;
 329                 do {
 330                         (void)snprintf(execname,
 331                             sizeof(execname), "%s/%s", *edir, execbase);
 332                         execv(execname, (char * const *)__UNCONST(argv));
 333                         if (errno != ENOENT) {
 334                                 if (spec)
 335                                         warn("exec %s for %s", execname, spec);
 336                                 else
 337                                         warn("exec %s", execname);
 338                         }
 339                 } while (*++edir != NULL);
 340
 341                 if (errno == ENOENT) {
 342                         if (spec)
 343                                 warn("exec %s for %s", execname, spec);
 344                         else
 345                                 warn("exec %s", execname);
 346                 }
 347                 _exit(FSCK_EXIT_CHECK_FAILED);
 348                 /* NOTREACHED */
 349
 350         default:                                /* Parent. */
 351                 if (optbuf)
 352                         free(optbuf);
 353                 free(argv);
 354
 355                 if (pidp) {
 356                         *pidp = pid;
 357                         return FSCK_EXIT_OK;
 358                 }
 359
 360                 if (waitpid(pid, &status, 0) < 0) {
 361                         warn("waitpid");
 362                         return FSCK_EXIT_CHECK_FAILED;
 363                 }
 364
 365                 if (WIFEXITED(status)) {
 366                         if (WEXITSTATUS(status) != 0)
 367                                 return WEXITSTATUS(status);
 368                 }
 369                 else if (WIFSIGNALED(status)) {
 370                         warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
 371                         return FSCK_EXIT_CHECK_FAILED;
 372                 }
 373                 break;
 374         }
 375
 376         return FSCK_EXIT_OK;
 377 }
 378
 379
 380 static int
 381 selected(const char *type)
 382 {
 383         struct entry *e;
 384
 385         /* If no type specified, it's always selected. */
 386         TAILQ_FOREACH(e, &selhead, entries)
 387                 if (!strcmp(e->type, type))
 388                         return which == IN_LIST ? 1 : 0;
 389
 390         return which == IN_LIST ? 0 : 1;
 391 }
 392
 393
 394 static const char *
 395 getoptions(const char *type)
 396 {
 397         struct entry *e;
 398
 399         TAILQ_FOREACH(e, &opthead, entries)
 400                 if (!strcmp(e->type, type))
 401                         return e->options;
 402         return "";
 403 }
 404
 405
 406 static void
 407 addoption(char *optstr)
 408 {
 409         char *newoptions;
 410         struct entry *e;
 411
 412         if ((newoptions = strchr(optstr, ':')) == NULL)
 413                 errx(1, "Invalid option string");
 414
 415         *newoptions++ = '\0';
 416
 417         TAILQ_FOREACH(e, &opthead, entries)
 418                 if (!strcmp(e->type, optstr)) {
 419                         catopt(&e->options, newoptions);
 420                         return;
 421                 }
 422         addentry(&opthead, optstr, newoptions);
 423 }
 424
 425
 426 static void
 427 addentry(struct fstypelist *list, const char *type, const char *opts)
 428 {
 429         struct entry *e;
 430
 431         e = emalloc(sizeof(struct entry));
 432         e->type = estrdup(type);
 433         e->options = estrdup(opts);
 434         TAILQ_INSERT_TAIL(list, e, entries);
 435 }
 436
 437
 438 static void
 439 maketypelist(char *fslist)
 440 {
 441         char *ptr;
 442
 443         if ((fslist == NULL) || (fslist[0] == '\0'))
 444                 errx(1, "empty type list");
 445
 446         if (fslist[0] == 'n' && fslist[1] == 'o') {
 447                 fslist += 2;
 448                 which = NOT_IN_LIST;
 449         }
 450         else
 451                 which = IN_LIST;
 452
 453         while ((ptr = strsep(&fslist, ",")) != NULL)
 454                 addentry(&selhead, ptr, "");
 455
 456 }
 457
 458
 459 static void
 460 catopt(char **sp, const char *o)
 461 {
 462         char *s;
 463         size_t i, j;
 464
 465         s = *sp;
 466         if (s) {
 467                 i = strlen(s);
 468                 j = i + 1 + strlen(o) + 1;
 469                 s = erealloc(s, j);
 470                 (void)snprintf(s + i, j, ",%s", o);
 471         } else
 472                 s = estrdup(o);
 473         *sp = s;
 474 }
 475
 476
 477 static void
 478 mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
 479 {
 480         char *p, *s;
 481         int argc, maxargc;
 482         const char **argv;
 483
 484         argc = *argcp;
 485         argv = *argvp;
 486         maxargc = *maxargcp;
 487
 488         for (s = opts; (p = strsep(&s, ",")) != NULL;) {
 489                 /* Always leave space for one more argument and the NULL. */
 490                 if (argc >= maxargc - 3) {
 491                         maxargc <<= 1;
 492                         argv = erealloc(argv, maxargc * sizeof(char *));
 493                 }
 494                 if (*p != '\0')  {
 495                         if (*p == '-') {
 496                                 argv[argc++] = p;
 497                                 p = strchr(p, '=');
 498                                 if (p) {
 499                                         *p = '\0';
 500                                         argv[argc++] = p+1;
 501                                 }
 502                         } else {
 503                                 argv[argc++] = "-o";
 504                                 argv[argc++] = p;
 505                         }
 506                 }
 507         }
 508
 509         *argcp = argc;
 510         *argvp = argv;
 511         *maxargcp = maxargc;
 512 }
 513
 514 static const char *
 515 getfslab(const char *str)
 516 {
 517         static struct dkwedge_info dkw;
 518         struct disklabel dl;
 519         int fd;
 520         char p;
 521         const char *vfstype;
 522         u_char t;
 523
 524         /* deduce the file system type from the disk label */
 525         if ((fd = open(str, O_RDONLY)) == -1)
 526                 err(1, "cannot open `%s'", str);
 527
 528         /* First check to see if it's a wedge. */
 529         if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
 530                 /* Yup, this is easy. */
 531                 (void) close(fd);
 532                 return (dkw.dkw_ptype);
 533         }
 534
 535         if (ioctl(fd, DIOCGDINFO, &dl) == -1)
 536                 err(1, "cannot get disklabel for `%s'", str);
 537
 538         (void) close(fd);
 539
 540         p = str[strlen(str) - 1];
 541
 542         if ((p - 'a') >= dl.d_npartitions)
 543                 errx(1, "partition `%s' is not defined on disk", str);
 544
 545         if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
 546                 errx(1, "partition `%s' is not of a legal vfstype",
 547                     str);
 548
 549         if ((vfstype = fscknames[t]) == NULL)
 550                 errx(1, "vfstype `%s' on partition `%s' is not supported",
 551                     fstypenames[t], str);
 552
 553         return vfstype;
 554 }
 555
 556
 557 static void
 558 usage(void)
 559 {
 560         static const char common[] =
 561             "[-dfnPpqvy] [-l maxparallel] [-T fstype:fsoptions]\n\t\t[-t fstype]";
 562
 563         (void)fprintf(stderr, "usage: %s %s [special|node]...\n",
 564             getprogname(), common);
 565         exit(FSCK_EXIT_USAGE);
 566 }