sbin/fsck/fsck.c

   1 /*      $NetBSD: fsck.c,v 1.49 2010/02/24 13:56:07 hannken 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 1.49 2010/02/24 13:56:07 hannken 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, omhead;
  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 int omitted(const char *);
  85 static void addoption(char *);
  86 static const char *getoptions(const char *);
  87 static void addentry(struct fstypelist *, const char *, const char *);
  88 static void maketypelist(char *);
  89 static void catopt(char **, const char *);
  90 static void mangle(char *, int *, const char ** volatile *, int *);
  91 static const char *getfslab(const char *);
  92 static void usage(void);
  93 static void *isok(struct fstab *);
  94
  95 int
  96 main(int argc, char *argv[])
  97 {
  98         struct fstab *fs;
  99         int i, rval;
 100         const char *vfstype = NULL;
 101         char globopt[3];
 102         int ret = FSCK_EXIT_OK;
 103
 104         globopt[0] = '-';
 105         globopt[2] = '\0';
 106
 107         TAILQ_INIT(&selhead);
 108         TAILQ_INIT(&opthead);
 109         TAILQ_INIT(&omhead);
 110
 111         while ((i = getopt(argc, argv, "dfl:nPpqT:t:vx:y")) != -1) {
 112                 switch (i) {
 113                 case 'd':
 114                         flags |= CHECK_DEBUG;
 115                         continue;
 116
 117                 case 'f':
 118                         flags |= CHECK_FORCE;
 119                         break;
 120
 121                 case 'n':
 122                         flags |= CHECK_NOFIX;
 123                         break;
 124
 125                 case 'p':
 126                         flags |= CHECK_PREEN;
 127                         break;
 128
 129                 case 'P':
 130                         flags |= CHECK_PROGRESS;
 131                         break;
 132
 133                 case 'q':
 134                         break;
 135
 136                 case 'l':
 137                         maxrun = atoi(optarg);
 138                         continue;
 139
 140                 case 'T':
 141                         if (*optarg)
 142                                 addoption(optarg);
 143                         continue;
 144
 145                 case 't':
 146                         if (TAILQ_FIRST(&selhead) != NULL)
 147                                 errx(1, "only one -t option may be specified.");
 148
 149                         maketypelist(optarg);
 150                         vfstype = optarg;
 151                         continue;
 152
 153                 case 'v':
 154                         flags |= CHECK_VERBOSE;
 155                         continue;
 156
 157                 case 'x':
 158                         addentry(&omhead, optarg, "");
 159                         continue;
 160
 161                 case 'y':
 162                         break;
 163
 164                 case '?':
 165                 default:
 166                         usage();
 167                         /* NOTREACHED */
 168                 }
 169
 170                 /* Pass option to fsck_xxxfs */
 171                 globopt[1] = i;
 172                 catopt(&options, globopt);
 173         }
 174
 175         /* Don't do progress meters if we're debugging. */
 176         if (flags & CHECK_DEBUG)
 177                 flags &= ~CHECK_PROGRESS;
 178
 179         /*
 180          * If progress meters are being used, force max parallel to 1
 181          * so the progress meter outputs don't interfere with one another.
 182          */
 183         if (flags & CHECK_PROGRESS)
 184                 maxrun = 1;
 185
 186 #ifdef __minix
 187         /* parallel checking heuristic doesn't work for minix currently */
 188         maxrun = 1;
 189 #endif
 190
 191         argc -= optind;
 192         argv += optind;
 193
 194         if (argc == 0)
 195                 return checkfstab(flags, maxrun, isok, checkfs);
 196
 197 #define BADTYPE(type)                                                   \
 198         (strcmp(type, FSTAB_RO) &&                                      \
 199             strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
 200
 201
 202         for (; argc--; argv++) {
 203                 const char *spec, *type, *cp;
 204                 char    device[MAXPATHLEN];
 205
 206                 spec = *argv;
 207                 cp = strrchr(spec, '/');
 208                 if (cp == 0) {
 209                         (void)snprintf(device, sizeof(device), "%s%s",
 210                                 _PATH_DEV, spec);
 211                         spec = device;
 212                 }
 213                 if ((fs = getfsfile(spec)) == NULL &&
 214                     (fs = getfsspec(spec)) == NULL) {
 215                         if (vfstype == NULL)
 216                                 vfstype = getfslab(spec);
 217                         type = vfstype;
 218                 }
 219                 else {
 220                         spec = fs->fs_spec;
 221                         type = fs->fs_vfstype;
 222                         if (BADTYPE(fs->fs_type))
 223                                 errx(FSCK_EXIT_CHECK_FAILED,
 224                                     "%s has unknown file system type.",
 225                                     spec);
 226                 }
 227
 228                 rval = checkfs(type, blockcheck(spec), *argv, NULL, NULL);
 229                 if (rval > ret)
 230                         ret = rval;
 231         }
 232
 233         return ret;
 234 }
 235
 236
 237 static void *
 238 isok(struct fstab *fs)
 239 {
 240
 241         if (fs->fs_passno == 0)
 242                 return NULL;
 243
 244         if (BADTYPE(fs->fs_type))
 245                 return NULL;
 246
 247         if (!selected(fs->fs_vfstype))
 248                 return NULL;
 249
 250         if (omitted(fs->fs_file))
 251                 return NULL;
 252
 253         return fs;
 254 }
 255
 256
 257 static int
 258 checkfs(const char *vfst, const char *spec, const char *mntpt, void *auxarg,
 259     pid_t *pidp)
 260 {
 261         /* List of directories containing fsck_xxx subcommands. */
 262         static const char *edirs[] = {
 263 #ifdef RESCUEDIR
 264                 RESCUEDIR,
 265 #endif
 266                 _PATH_SBIN,
 267                 _PATH_USRSBIN,
 268 #ifdef __minix
 269                 "/usr/pkg/sbin/",
 270 #endif
 271                 NULL
 272         };
 273         const char ** volatile argv, **edir;
 274         const char * volatile vfstype = vfst;
 275         pid_t pid;
 276         int argc, i, status, maxargc;
 277         char *optb;
 278         char *volatile optbuf;
 279         char execname[MAXPATHLEN + 1], execbase1[MAXPATHLEN], execbase2[MAXPATHLEN];
 280         const char *extra = getoptions(vfstype);
 281
 282         if (!strcmp(vfstype, "ufs"))
 283                 vfstype = MOUNT_UFS;
 284
 285         optb = NULL;
 286         if (options)
 287                 catopt(&optb, options);
 288         if (extra)
 289                 catopt(&optb, extra);
 290         optbuf = optb;
 291
 292         maxargc = 64;
 293         argv = emalloc(sizeof(char *) * maxargc);
 294
 295         (void) snprintf(execbase1, sizeof(execbase1), "fsck_%s", vfstype);
 296         (void) snprintf(execbase2, sizeof(execbase2), "fsck.%s", vfstype);
 297         argc = 0;
 298         argv[argc++] = execbase1;
 299         if (optbuf)
 300                 mangle(optbuf, &argc, &argv, &maxargc);
 301         argv[argc++] = spec;
 302         argv[argc] = NULL;
 303
 304         if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
 305                 (void)printf("start %s %swait", mntpt,
 306                         pidp ? "no" : "");
 307                 for (i = 0; i < argc; i++)
 308                         (void)printf(" %s", argv[i]);
 309                 (void)printf("\n");
 310         }
 311
 312         switch (pid = vfork()) {
 313         case -1:                                /* Error. */
 314                 warn("vfork");
 315                 if (optbuf)
 316                         free(optbuf);
 317                 free(argv);
 318                 return FSCK_EXIT_CHECK_FAILED;
 319
 320         case 0:                                 /* Child. */
 321 #ifndef __minix
 322                 if ((flags & CHECK_FORCE) == 0) {
 323                         struct statvfs  sfs;
 324
 325                                 /*
 326                                  * if mntpt is a mountpoint of a mounted file
 327                                  * system and it's mounted read-write, skip it
 328                                  * unless -f is given.
 329                                  */
 330                         if ((statvfs(mntpt, &sfs) == 0) &&
 331                             (strcmp(mntpt, sfs.f_mntonname) == 0) &&
 332                             ((sfs.f_flag & MNT_RDONLY) == 0)) {
 333                                 printf(
 334                 "%s: file system is mounted read-write on %s; not checking\n",
 335                                     spec, mntpt);
 336                                 if ((flags & CHECK_PREEN) && auxarg != NULL)
 337                                         _exit(FSCK_EXIT_OK);    /* fsck -p */
 338                                 else
 339                                         _exit(FSCK_EXIT_CHECK_FAILED);  /* fsck [[-p] ...] */
 340                         }
 341                 }
 342 #endif
 343
 344                 if (flags & CHECK_DEBUG)
 345                         _exit(FSCK_EXIT_OK);
 346
 347                 /* Go find an executable. */
 348                 edir = edirs;
 349                 do {
 350                         (void)snprintf(execname,
 351                             sizeof(execname), "%s/%s", *edir, execbase1);
 352                         execv(execname, (char * const *)__UNCONST(argv));
 353                         if (errno != ENOENT) {
 354                                 if (spec)
 355                                         warn("exec %s for %s", execname, spec);
 356                                 else
 357                                         warn("exec %s", execname);
 358                         }
 359                         (void)snprintf(execname,
 360                             sizeof(execname), "%s/%s", *edir, execbase2);
 361                         execv(execname, (char * const *)__UNCONST(argv));
 362                         if (errno != ENOENT) {
 363                                 if (spec)
 364                                         warn("exec %s for %s", execname, spec);
 365                                 else
 366                                         warn("exec %s", execname);
 367                         }
 368                 } while (*++edir != NULL);
 369
 370                 if (errno == ENOENT) {
 371                         if (spec)
 372                                 warn("exec %s for %s", execname, spec);
 373                         else
 374                                 warn("exec %s", execname);
 375                 }
 376                 _exit(FSCK_EXIT_CHECK_FAILED);
 377                 /* NOTREACHED */
 378
 379         default:                                /* Parent. */
 380                 if (optbuf)
 381                         free(optbuf);
 382                 free(argv);
 383
 384                 if (pidp) {
 385                         *pidp = pid;
 386                         return FSCK_EXIT_OK;
 387                 }
 388
 389                 if (waitpid(pid, &status, 0) < 0) {
 390                         warn("waitpid");
 391                         return FSCK_EXIT_CHECK_FAILED;
 392                 }
 393
 394                 if (WIFEXITED(status)) {
 395                         if (WEXITSTATUS(status) != 0)
 396                                 return WEXITSTATUS(status);
 397                 }
 398                 else if (WIFSIGNALED(status)) {
 399                         warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
 400                         return FSCK_EXIT_CHECK_FAILED;
 401                 }
 402                 break;
 403         }
 404
 405         return FSCK_EXIT_OK;
 406 }
 407
 408
 409 static int
 410 selected(const char *type)
 411 {
 412         struct entry *e;
 413
 414         /* If no type specified, it's always selected. */
 415         TAILQ_FOREACH(e, &selhead, entries)
 416                 if (!strcmp(e->type, type))
 417                         return which == IN_LIST ? 1 : 0;
 418
 419         return which == IN_LIST ? 0 : 1;
 420 }
 421
 422
 423 static int
 424 omitted(const char *mountedon)
 425 {
 426         struct entry *e;
 427
 428         /* If no type specified, it's always selected. */
 429         TAILQ_FOREACH(e, &omhead, entries)
 430                 if (!strcmp(e->type, mountedon))
 431                         return 1;
 432
 433         return 0;
 434 }
 435
 436
 437 static const char *
 438 getoptions(const char *type)
 439 {
 440         struct entry *e;
 441
 442         TAILQ_FOREACH(e, &opthead, entries)
 443                 if (!strcmp(e->type, type))
 444                         return e->options;
 445         return "";
 446 }
 447
 448
 449 static void
 450 addoption(char *optstr)
 451 {
 452         char *newoptions;
 453         struct entry *e;
 454
 455         if ((newoptions = strchr(optstr, ':')) == NULL)
 456                 errx(1, "Invalid option string");
 457
 458         *newoptions++ = '\0';
 459
 460         TAILQ_FOREACH(e, &opthead, entries)
 461                 if (!strcmp(e->type, optstr)) {
 462                         catopt(&e->options, newoptions);
 463                         return;
 464                 }
 465         addentry(&opthead, optstr, newoptions);
 466 }
 467
 468
 469 static void
 470 addentry(struct fstypelist *list, const char *type, const char *opts)
 471 {
 472         struct entry *e;
 473
 474         e = emalloc(sizeof(struct entry));
 475         e->type = estrdup(type);
 476         e->options = estrdup(opts);
 477         TAILQ_INSERT_TAIL(list, e, entries);
 478 }
 479
 480
 481 static void
 482 maketypelist(char *fslist)
 483 {
 484         char *ptr;
 485
 486         if ((fslist == NULL) || (fslist[0] == '\0'))
 487                 errx(1, "empty type list");
 488
 489         if (fslist[0] == 'n' && fslist[1] == 'o') {
 490                 fslist += 2;
 491                 which = NOT_IN_LIST;
 492         }
 493         else
 494                 which = IN_LIST;
 495
 496         while ((ptr = strsep(&fslist, ",")) != NULL)
 497                 addentry(&selhead, ptr, "");
 498
 499 }
 500
 501
 502 static void
 503 catopt(char **sp, const char *o)
 504 {
 505         char *s;
 506         size_t i, j;
 507
 508         s = *sp;
 509         if (s) {
 510                 i = strlen(s);
 511                 j = i + 1 + strlen(o) + 1;
 512                 s = erealloc(s, j);
 513                 (void)snprintf(s + i, j, ",%s", o);
 514         } else
 515                 s = estrdup(o);
 516         *sp = s;
 517 }
 518
 519
 520 static void
 521 mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
 522 {
 523         char *p, *s;
 524         int argc, maxargc;
 525         const char **argv;
 526
 527         argc = *argcp;
 528         argv = *argvp;
 529         maxargc = *maxargcp;
 530
 531         for (s = opts; (p = strsep(&s, ",")) != NULL;) {
 532                 /* Always leave space for one more argument and the NULL. */
 533                 if (argc >= maxargc - 3) {
 534                         maxargc <<= 1;
 535                         argv = erealloc(argv, maxargc * sizeof(char *));
 536                 }
 537                 if (*p != '\0')  {
 538                         if (*p == '-') {
 539                                 argv[argc++] = p;
 540                                 p = strchr(p, '=');
 541                                 if (p) {
 542                                         *p = '\0';
 543                                         argv[argc++] = p+1;
 544                                 }
 545                         } else {
 546                                 argv[argc++] = "-o";
 547                                 argv[argc++] = p;
 548                         }
 549                 }
 550         }
 551
 552         *argcp = argc;
 553         *argvp = argv;
 554         *maxargcp = maxargc;
 555 }
 556
 557 static const char *
 558 getfslab(const char *str)
 559 {
 560 #ifdef __minix
 561         errx(1, "cannot determine vfstype under minix");
 562 #else
 563         static struct dkwedge_info dkw;
 564         struct disklabel dl;
 565         int fd;
 566         char p;
 567         const char *vfstype;
 568         u_char t;
 569
 570         /* deduce the file system type from the disk label */
 571         if ((fd = open(str, O_RDONLY)) == -1)
 572                 err(1, "cannot open `%s'", str);
 573
 574         /* First check to see if it's a wedge. */
 575         if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
 576                 /* Yup, this is easy. */
 577                 (void) close(fd);
 578                 return (dkw.dkw_ptype);
 579         }
 580
 581         if (ioctl(fd, DIOCGDINFO, &dl) == -1)
 582                 err(1, "cannot get disklabel for `%s'", str);
 583
 584         (void) close(fd);
 585
 586         p = str[strlen(str) - 1];
 587
 588         if ((p - 'a') >= dl.d_npartitions)
 589                 errx(1, "partition `%s' is not defined on disk", str);
 590
 591         if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
 592                 errx(1, "partition `%s' is not of a legal vfstype",
 593                     str);
 594
 595         if ((vfstype = fscknames[t]) == NULL)
 596                 errx(1, "vfstype `%s' on partition `%s' is not supported",
 597                     fstypenames[t], str);
 598
 599         return vfstype;
 600 #endif
 601 }
 602
 603
 604 static void
 605 usage(void)
 606 {
 607         static const char common[] =
 608             "[-dfnPpqvy] [-x excludemount] [-l maxparallel] [-T fstype:fsoptions]\n\t\t[-t fstype]";
 609
 610         (void)fprintf(stderr, "usage: %s %s [special|node]...\n",
 611             getprogname(), common);
 612         exit(FSCK_EXIT_USAGE);
 613 }