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/file.h>
  46 #include <sys/mount.h>
  47 #include <sys/resource.h>
  48 #include <sys/stat.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/uio.h>
  51 #include <sys/disklabel.h>
  52
  53 #include <ufs/ufs/dinode.h>
  54 #include <ufs/ffs/fs.h>
  55
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <fstab.h>
  59 #include <grp.h>
  60 #include <mntopts.h>
  61 #include <paths.h>
  62 #include <stdint.h>
  63 #include <string.h>
  64 #include <time.h>
  65
  66 #include "fsck.h"
  67
  68 static void usage(void) __dead2;
  69 static int argtoi(int flag, const char *req, const char *str, int base);
  70 static int checkfilesys(char *filesys);
  71 static int chkdoreload(struct statfs *mntp);
  72 static struct statfs *getmntpt(const char *);
  73
  74 int
  75 main(int argc, char *argv[])
  76 {
  77         int ch;
  78         struct rlimit rlimit;
  79         struct itimerval itimerval;
  80         int ret = 0;
  81
  82         sync();
  83         skipclean = 1;
  84         inoopt = 0;
  85         while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npryZ")) != -1) {
  86                 switch (ch) {
  87                 case 'b':
  88                         skipclean = 0;
  89                         bflag = argtoi('b', "number", optarg, 10);
  90                         printf("Alternate super block location: %d\n", bflag);
  91                         break;
  92
  93                 case 'B':
  94                         bkgrdflag = 1;
  95                         break;
  96
  97                 case 'c':
  98                         skipclean = 0;
  99                         cvtlevel = argtoi('c', "conversion level", optarg, 10);
 100                         if (cvtlevel < 3)
 101                                 errx(EEXIT, "cannot do level %d conversion",
 102                                     cvtlevel);
 103                         break;
 104
 105                 case 'd':
 106                         debug++;
 107                         break;
 108
 109                 case 'E':
 110                         Eflag++;
 111                         break;
 112
 113                 case 'f':
 114                         skipclean = 0;
 115                         break;
 116
 117                 case 'F':
 118                         bkgrdcheck = 1;
 119                         break;
 120
 121                 case 'm':
 122                         lfmode = argtoi('m', "mode", optarg, 8);
 123                         if (lfmode &~ 07777)
 124                                 errx(EEXIT, "bad mode to -m: %o", lfmode);
 125                         printf("** lost+found creation mode %o\n", lfmode);
 126                         break;
 127
 128                 case 'n':
 129                         nflag++;
 130                         yflag = 0;
 131                         break;
 132
 133                 case 'p':
 134                         preen++;
 135                         /*FALLTHROUGH*/
 136
 137                 case 'C':
 138                         ckclean++;
 139                         break;
 140
 141                 case 'r':
 142                         inoopt++;
 143                         break;
 144
 145                 case 'y':
 146                         yflag++;
 147                         nflag = 0;
 148                         break;
 149
 150                 case 'Z':
 151                         Zflag++;
 152                         break;
 153
 154                 default:
 155                         usage();
 156                 }
 157         }
 158         argc -= optind;
 159         argv += optind;
 160
 161         if (!argc)
 162                 usage();
 163
 164         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 165                 (void)signal(SIGINT, catch);
 166         if (ckclean)
 167                 (void)signal(SIGQUIT, catchquit);
 168         signal(SIGINFO, infohandler);
 169         if (bkgrdflag) {
 170                 signal(SIGALRM, alarmhandler);
 171                 itimerval.it_interval.tv_sec = 5;
 172                 itimerval.it_interval.tv_usec = 0;
 173                 itimerval.it_value.tv_sec = 5;
 174                 itimerval.it_value.tv_usec = 0;
 175                 setitimer(ITIMER_REAL, &itimerval, NULL);
 176         }
 177         /*
 178          * Push up our allowed memory limit so we can cope
 179          * with huge file systems.
 180          */
 181         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 182                 rlimit.rlim_cur = rlimit.rlim_max;
 183                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 184         }
 185         while (argc-- > 0)
 186                 (void)checkfilesys(*argv++);
 187
 188         if (returntosingle)
 189                 ret = 2;
 190         exit(ret);
 191 }
 192
 193 static int
 194 argtoi(int flag, const char *req, const char *str, int base)
 195 {
 196         char *cp;
 197         int ret;
 198
 199         ret = (int)strtol(str, &cp, base);
 200         if (cp == str || *cp)
 201                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 202         return (ret);
 203 }
 204
 205 /*
 206  * Check the specified file system.
 207  */
 208 /* ARGSUSED */
 209 static int
 210 checkfilesys(char *filesys)
 211 {
 212         ufs2_daddr_t n_ffree, n_bfree;
 213         struct dups *dp;
 214         struct statfs *mntp;
 215         struct stat snapdir;
 216         struct group *grp;
 217         ufs2_daddr_t blks;
 218         struct iovec *iov;
 219         char errmsg[255];
 220         int iovlen;
 221         int cylno;
 222         ino_t files;
 223         size_t size;
 224
 225         iov = NULL;
 226         iovlen = 0;
 227         errmsg[0] = '\0';
 228
 229         cdevname = filesys;
 230         if (debug && ckclean)
 231                 pwarn("starting\n");
 232         /*
 233          * Make best effort to get the disk name. Check first to see
 234          * if it is listed among the mounted file systems. Failing that
 235          * check to see if it is listed in /etc/fstab.
 236          */
 237         mntp = getmntpt(filesys);
 238         if (mntp != NULL)
 239                 filesys = mntp->f_mntfromname;
 240         else
 241                 filesys = blockcheck(filesys);
 242         /*
 243          * If -F flag specified, check to see whether a background check
 244          * is possible and needed. If possible and needed, exit with
 245          * status zero. Otherwise exit with status non-zero. A non-zero
 246          * exit status will cause a foreground check to be run.
 247          */
 248         sblock_init();
 249         if (bkgrdcheck) {
 250                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 251                         exit(3);        /* Cannot read superblock */
 252                 close(fsreadfd);
 253                 /* Earlier background failed or journaled */
 254                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
 255                         exit(4);
 256                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 257                         exit(5);        /* Not running soft updates */
 258                 size = MIBSIZE;
 259                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 260                         exit(6);        /* Lacks kernel support */
 261                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 262                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 263                         exit(7);        /* Filesystem clean, report it now */
 264                 exit(0);
 265         }
 266         if (ckclean && skipclean) {
 267                 /*
 268                  * If file system is gjournaled, check it here.
 269                  */
 270                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 271                         exit(3);        /* Cannot read superblock */
 272                 close(fsreadfd);
 273                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 274                         //printf("GJournaled file system detected on %s.\n",
 275                         //    filesys);
 276                         if (sblock.fs_clean == 1) {
 277                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 278                                 exit(0);
 279                         }
 280                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 281                                 gjournal_check(filesys);
 282                                 if (chkdoreload(mntp) == 0)
 283                                         exit(0);
 284                                 exit(4);
 285                         } else {
 286                                 pfatal("UNEXPECTED INCONSISTENCY, %s\n",
 287                                     "CANNOT RUN FAST FSCK\n");
 288                         }
 289                 }
 290         }
 291         /*
 292          * If we are to do a background check:
 293          *      Get the mount point information of the file system
 294          *      create snapshot file
 295          *      return created snapshot file
 296          *      if not found, clear bkgrdflag and proceed with normal fsck
 297          */
 298         if (bkgrdflag) {
 299                 if (mntp == NULL) {
 300                         bkgrdflag = 0;
 301                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 302                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 303                         bkgrdflag = 0;
 304                         pfatal("NOT USING SOFT UPDATES, %s\n",
 305                             "CANNOT RUN IN BACKGROUND");
 306                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 307                         bkgrdflag = 0;
 308                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 309                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 310                         if (readsb(0) != 0) {
 311                                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
 312                                         bkgrdflag = 0;
 313                                         pfatal("UNEXPECTED INCONSISTENCY, %s\n",
 314                                             "CANNOT RUN IN BACKGROUND\n");
 315                                 }
 316                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 317                                     skipclean && ckclean) {
 318                                         /*
 319                                          * file system is clean;
 320                                          * skip snapshot and report it clean
 321                                          */
 322                                         pwarn("FILE SYSTEM CLEAN; %s\n",
 323                                             "SKIPPING CHECKS");
 324                                         goto clean;
 325                                 }
 326                         }
 327                         close(fsreadfd);
 328                 }
 329                 if (bkgrdflag) {
 330                         snprintf(snapname, sizeof snapname, "%s/.snap",
 331                             mntp->f_mntonname);
 332                         if (stat(snapname, &snapdir) < 0) {
 333                                 if (errno != ENOENT) {
 334                                         bkgrdflag = 0;
 335                                         pfatal("CANNOT FIND %s %s: %s, %s\n",
 336                                             "SNAPSHOT DIRECTORY",
 337                                             snapname, strerror(errno),
 338                                             "CANNOT RUN IN BACKGROUND");
 339                                 } else if ((grp = getgrnam("operator")) == 0 ||
 340                                     mkdir(snapname, 0770) < 0 ||
 341                                     chown(snapname, -1, grp->gr_gid) < 0 ||
 342                                     chmod(snapname, 0770) < 0) {
 343                                         bkgrdflag = 0;
 344                                         pfatal("CANNOT CREATE %s %s: %s, %s\n",
 345                                             "SNAPSHOT DIRECTORY",
 346                                             snapname, strerror(errno),
 347                                             "CANNOT RUN IN BACKGROUND");
 348                                 }
 349                         } else if (!S_ISDIR(snapdir.st_mode)) {
 350                                 bkgrdflag = 0;
 351                                 pfatal("%s IS NOT A DIRECTORY, %s\n", snapname,
 352                                     "CANNOT RUN IN BACKGROUND");
 353                         }
 354                 }
 355                 if (bkgrdflag) {
 356                         snprintf(snapname, sizeof snapname,
 357                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 358                         build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 359                         build_iovec(&iov, &iovlen, "from", snapname,
 360                             (size_t)-1);
 361                         build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 362                             (size_t)-1);
 363                         build_iovec(&iov, &iovlen, "errmsg", errmsg,
 364                             sizeof(errmsg));
 365                         build_iovec(&iov, &iovlen, "update", NULL, 0);
 366                         build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
 367
 368                         while (nmount(iov, iovlen, mntp->f_flags) < 0) {
 369                                 if (errno == EEXIST && unlink(snapname) == 0)
 370                                         continue;
 371                                 bkgrdflag = 0;
 372                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
 373                                     snapname, strerror(errno), errmsg);
 374                                 break;
 375                         }
 376                         if (bkgrdflag != 0)
 377                                 filesys = snapname;
 378                 }
 379         }
 380
 381         switch (setup(filesys)) {
 382         case 0:
 383                 if (preen)
 384                         pfatal("CAN'T CHECK FILE SYSTEM.");
 385                 return (0);
 386         case -1:
 387         clean:
 388                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 389                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 390                 printf("(%lld frags, %lld blocks, %.1f%% fragmentation)\n",
 391                     (long long)sblock.fs_cstotal.cs_nffree,
 392                     (long long)sblock.fs_cstotal.cs_nbfree,
 393                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 394                 return (0);
 395         }
 396         /*
 397          * Determine if we can and should do journal recovery.
 398          */
 399         if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
 400                 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
 401                         if (preen || reply("USE JOURNAL")) {
 402                                 if (suj_check(filesys) == 0) {
 403                                         printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
 404                                         if (chkdoreload(mntp) == 0)
 405                                                 exit(0);
 406                                         exit(4);
 407                                 }
 408                         }
 409                         printf("** Skipping journal, falling through to full fsck\n\n");
 410                 }
 411                 /*
 412                  * Write the superblock so we don't try to recover the
 413                  * journal on another pass.
 414                  */
 415                 sblock.fs_mtime = time(NULL);
 416                 sbdirty();
 417         }
 418
 419         /*
 420          * Cleared if any questions answered no. Used to decide if
 421          * the superblock should be marked clean.
 422          */
 423         resolved = 1;
 424         /*
 425          * 1: scan inodes tallying blocks used
 426          */
 427         if (preen == 0) {
 428                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 429                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 430                         printf("** Root file system\n");
 431                 printf("** Phase 1 - Check Blocks and Sizes\n");
 432         }
 433         clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
 434         pass1();
 435         IOstats("Pass1");
 436
 437         /*
 438          * 1b: locate first references to duplicates, if any
 439          */
 440         if (duplist) {
 441                 if (preen || usedsoftdep)
 442                         pfatal("INTERNAL ERROR: dups with %s%s%s",
 443                             preen ? "-p" : "",
 444                             (preen && usedsoftdep) ? " and " : "",
 445                             usedsoftdep ? "softupdates" : "");
 446                 printf("** Phase 1b - Rescan For More DUPS\n");
 447                 pass1b();
 448                 IOstats("Pass1b");
 449         }
 450
 451         /*
 452          * 2: traverse directories from root to mark all connected directories
 453          */
 454         if (preen == 0)
 455                 printf("** Phase 2 - Check Pathnames\n");
 456         pass2();
 457         IOstats("Pass2");
 458
 459         /*
 460          * 3: scan inodes looking for disconnected directories
 461          */
 462         if (preen == 0)
 463                 printf("** Phase 3 - Check Connectivity\n");
 464         pass3();
 465         IOstats("Pass3");
 466
 467         /*
 468          * 4: scan inodes looking for disconnected files; check reference counts
 469          */
 470         if (preen == 0)
 471                 printf("** Phase 4 - Check Reference Counts\n");
 472         pass4();
 473         IOstats("Pass4");
 474
 475         /*
 476          * 5: check and repair resource counts in cylinder groups
 477          */
 478         if (preen == 0)
 479                 printf("** Phase 5 - Check Cyl groups\n");
 480         pass5();
 481         IOstats("Pass5");
 482
 483         /*
 484          * print out summary statistics
 485          */
 486         n_ffree = sblock.fs_cstotal.cs_nffree;
 487         n_bfree = sblock.fs_cstotal.cs_nbfree;
 488         files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 489         blks = n_blks +
 490             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 491         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 492         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 493         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 494         if (bkgrdflag && (files > 0 || blks > 0)) {
 495                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 496                 pwarn("Reclaimed: %ld directories, %ld files, %lld fragments\n",
 497                     countdirs, (long)files - countdirs, (long long)blks);
 498         }
 499         pwarn("%ld files, %jd used, %ju free ",
 500             (long)n_files, (intmax_t)n_blks,
 501             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 502         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 503             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 504             n_ffree * 100.0 / sblock.fs_dsize);
 505         if (debug) {
 506                 if (files < 0)
 507                         printf("%d inodes missing\n", -files);
 508                 if (blks < 0)
 509                         printf("%lld blocks missing\n", -(long long)blks);
 510                 if (duplist != NULL) {
 511                         printf("The following duplicate blocks remain:");
 512                         for (dp = duplist; dp; dp = dp->next)
 513                                 printf(" %lld,", (long long)dp->dup);
 514                         printf("\n");
 515                 }
 516         }
 517         duplist = (struct dups *)0;
 518         muldup = (struct dups *)0;
 519         inocleanup();
 520         if (fsmodified) {
 521                 sblock.fs_time = time(NULL);
 522                 sbdirty();
 523         }
 524         if (cvtlevel && sblk.b_dirty) {
 525                 /*
 526                  * Write out the duplicate super blocks
 527                  */
 528                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 529                         blwrite(fswritefd, (char *)&sblock,
 530                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 531                             SBLOCKSIZE);
 532         }
 533         if (rerun)
 534                 resolved = 0;
 535         finalIOstats();
 536
 537         /*
 538          * Check to see if the file system is mounted read-write.
 539          */
 540         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 541                 resolved = 0;
 542         ckfini(resolved);
 543
 544         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 545                 if (inostathead[cylno].il_stat != NULL)
 546                         free((char *)inostathead[cylno].il_stat);
 547         free((char *)inostathead);
 548         inostathead = NULL;
 549         if (fsmodified && !preen)
 550                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 551         if (rerun)
 552                 printf("\n***** PLEASE RERUN FSCK *****\n");
 553         if (chkdoreload(mntp) != 0) {
 554                 if (!fsmodified)
 555                         return (0);
 556                 if (!preen)
 557                         printf("\n***** REBOOT NOW *****\n");
 558                 sync();
 559                 return (4);
 560         }
 561         return (0);
 562 }
 563
 564 static int
 565 chkdoreload(struct statfs *mntp)
 566 {
 567         struct iovec *iov;
 568         int iovlen;
 569         char errmsg[255];
 570
 571         if (mntp == NULL)
 572                 return (0);
 573
 574         iov = NULL;
 575         iovlen = 0;
 576         errmsg[0] = '\0';
 577         /*
 578          * We modified a mounted file system.  Do a mount update on
 579          * it unless it is read-write, so we can continue using it
 580          * as safely as possible.
 581          */
 582         if (mntp->f_flags & MNT_RDONLY) {
 583                 build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 584                 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
 585                     (size_t)-1);
 586                 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 587                     (size_t)-1);
 588                 build_iovec(&iov, &iovlen, "errmsg", errmsg,
 589                     sizeof(errmsg));
 590                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 591                 build_iovec(&iov, &iovlen, "reload", NULL, 0);
 592                 /*
 593                  * XX: We need the following line until we clean up
 594                  * nmount parsing of root mounts and NFS root mounts.
 595                  */
 596                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 597                 if (nmount(iov, iovlen, mntp->f_flags) == 0) {
 598                         return (0);
 599                 }
 600                 pwarn("mount reload of '%s' failed: %s %s\n\n",
 601                     mntp->f_mntonname, strerror(errno), errmsg);
 602                 return (1);
 603         }
 604         return (0);
 605 }
 606
 607 /*
 608  * Get the mount point information for name.
 609  */
 610 static struct statfs *
 611 getmntpt(const char *name)
 612 {
 613         struct stat devstat, mntdevstat;
 614         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 615         char *ddevname;
 616         struct statfs *mntbuf, *statfsp;
 617         int i, mntsize, isdev;
 618
 619         if (stat(name, &devstat) != 0)
 620                 return (NULL);
 621         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 622                 isdev = 1;
 623         else
 624                 isdev = 0;
 625         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 626         for (i = 0; i < mntsize; i++) {
 627                 statfsp = &mntbuf[i];
 628                 ddevname = statfsp->f_mntfromname;
 629                 if (*ddevname != '/') {
 630                         strcpy(device, _PATH_DEV);
 631                         strcat(device, ddevname);
 632                         strcpy(statfsp->f_mntfromname, device);
 633                 }
 634                 if (isdev == 0) {
 635                         if (strcmp(name, statfsp->f_mntonname))
 636                                 continue;
 637                         return (statfsp);
 638                 }
 639                 if (stat(ddevname, &mntdevstat) == 0 &&
 640                     mntdevstat.st_rdev == devstat.st_rdev)
 641                         return (statfsp);
 642         }
 643         statfsp = NULL;
 644         return (statfsp);
 645 }
 646
 647 static void
 648 usage(void)
 649 {
 650         (void) fprintf(stderr,
 651             "usage: %s [-BEFfnpry] [-b block] [-c level] [-m mode] "
 652                         "filesystem ...\n",
 653             getprogname());
 654         exit(1);
 655 }