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:nprSyZ")) != -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 'S':
 146                         surrender = 1;
 147                         break;
 148
 149                 case 'y':
 150                         yflag++;
 151                         nflag = 0;
 152                         break;
 153
 154                 case 'Z':
 155                         Zflag++;
 156                         break;
 157
 158                 default:
 159                         usage();
 160                 }
 161         }
 162         argc -= optind;
 163         argv += optind;
 164
 165         if (!argc)
 166                 usage();
 167
 168         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 169                 (void)signal(SIGINT, catch);
 170         if (ckclean)
 171                 (void)signal(SIGQUIT, catchquit);
 172         signal(SIGINFO, infohandler);
 173         if (bkgrdflag) {
 174                 signal(SIGALRM, alarmhandler);
 175                 itimerval.it_interval.tv_sec = 5;
 176                 itimerval.it_interval.tv_usec = 0;
 177                 itimerval.it_value.tv_sec = 5;
 178                 itimerval.it_value.tv_usec = 0;
 179                 setitimer(ITIMER_REAL, &itimerval, NULL);
 180         }
 181         /*
 182          * Push up our allowed memory limit so we can cope
 183          * with huge file systems.
 184          */
 185         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 186                 rlimit.rlim_cur = rlimit.rlim_max;
 187                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 188         }
 189         while (argc-- > 0)
 190                 (void)checkfilesys(*argv++);
 191
 192         if (returntosingle)
 193                 ret = 2;
 194         exit(ret);
 195 }
 196
 197 static int
 198 argtoi(int flag, const char *req, const char *str, int base)
 199 {
 200         char *cp;
 201         int ret;
 202
 203         ret = (int)strtol(str, &cp, base);
 204         if (cp == str || *cp)
 205                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 206         return (ret);
 207 }
 208
 209 /*
 210  * Check the specified file system.
 211  */
 212 /* ARGSUSED */
 213 static int
 214 checkfilesys(char *filesys)
 215 {
 216         ufs2_daddr_t n_ffree, n_bfree;
 217         struct dups *dp;
 218         struct statfs *mntp;
 219         struct stat snapdir;
 220         struct group *grp;
 221         struct iovec *iov;
 222         char errmsg[255];
 223         int iovlen;
 224         int cylno;
 225         intmax_t blks, files;
 226         size_t size;
 227
 228         iov = NULL;
 229         iovlen = 0;
 230         errmsg[0] = '\0';
 231
 232         cdevname = filesys;
 233         if (debug && ckclean)
 234                 pwarn("starting\n");
 235         /*
 236          * Make best effort to get the disk name. Check first to see
 237          * if it is listed among the mounted file systems. Failing that
 238          * check to see if it is listed in /etc/fstab.
 239          */
 240         mntp = getmntpt(filesys);
 241         if (mntp != NULL)
 242                 filesys = mntp->f_mntfromname;
 243         else
 244                 filesys = blockcheck(filesys);
 245         /*
 246          * If -F flag specified, check to see whether a background check
 247          * is possible and needed. If possible and needed, exit with
 248          * status zero. Otherwise exit with status non-zero. A non-zero
 249          * exit status will cause a foreground check to be run.
 250          */
 251         sblock_init();
 252         if (bkgrdcheck) {
 253                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 254                         exit(3);        /* Cannot read superblock */
 255                 close(fsreadfd);
 256                 /* Earlier background failed or journaled */
 257                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
 258                         exit(4);
 259                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 260                         exit(5);        /* Not running soft updates */
 261                 size = MIBSIZE;
 262                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 263                         exit(6);        /* Lacks kernel support */
 264                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 265                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 266                         exit(7);        /* Filesystem clean, report it now */
 267                 exit(0);
 268         }
 269         if (ckclean && skipclean) {
 270                 /*
 271                  * If file system is gjournaled, check it here.
 272                  */
 273                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 274                         exit(3);        /* Cannot read superblock */
 275                 close(fsreadfd);
 276                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 277                         //printf("GJournaled file system detected on %s.\n",
 278                         //    filesys);
 279                         if (sblock.fs_clean == 1) {
 280                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 281                                 exit(0);
 282                         }
 283                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 284                                 gjournal_check(filesys);
 285                                 if (chkdoreload(mntp) == 0)
 286                                         exit(0);
 287                                 exit(4);
 288                         } else {
 289                                 pfatal(
 290                             "UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
 291                         }
 292                 }
 293         }
 294         /*
 295          * If we are to do a background check:
 296          *      Get the mount point information of the file system
 297          *      create snapshot file
 298          *      return created snapshot file
 299          *      if not found, clear bkgrdflag and proceed with normal fsck
 300          */
 301         if (bkgrdflag) {
 302                 if (mntp == NULL) {
 303                         bkgrdflag = 0;
 304                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 305                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 306                         bkgrdflag = 0;
 307                         pfatal(
 308                           "NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
 309                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 310                         bkgrdflag = 0;
 311                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 312                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 313                         if (readsb(0) != 0) {
 314                                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
 315                                         bkgrdflag = 0;
 316                                         pfatal(
 317                         "UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
 318                                 }
 319                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 320                                     skipclean && ckclean) {
 321                                         /*
 322                                          * file system is clean;
 323                                          * skip snapshot and report it clean
 324                                          */
 325                                         pwarn(
 326                                         "FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 327                                         goto clean;
 328                                 }
 329                         }
 330                         close(fsreadfd);
 331                 }
 332                 if (bkgrdflag) {
 333                         snprintf(snapname, sizeof snapname, "%s/.snap",
 334                             mntp->f_mntonname);
 335                         if (stat(snapname, &snapdir) < 0) {
 336                                 if (errno != ENOENT) {
 337                                         bkgrdflag = 0;
 338                                         pfatal(
 339         "CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 340                                             snapname, strerror(errno));
 341                                 } else if ((grp = getgrnam("operator")) == 0 ||
 342                                     mkdir(snapname, 0770) < 0 ||
 343                                     chown(snapname, -1, grp->gr_gid) < 0 ||
 344                                     chmod(snapname, 0770) < 0) {
 345                                         bkgrdflag = 0;
 346                                         pfatal(
 347         "CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 348                                             snapname, strerror(errno));
 349                                 }
 350                         } else if (!S_ISDIR(snapdir.st_mode)) {
 351                                 bkgrdflag = 0;
 352                                 pfatal(
 353                         "%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
 354                                     snapname);
 355                         }
 356                 }
 357                 if (bkgrdflag) {
 358                         snprintf(snapname, sizeof snapname,
 359                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 360                         build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 361                         build_iovec(&iov, &iovlen, "from", snapname,
 362                             (size_t)-1);
 363                         build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 364                             (size_t)-1);
 365                         build_iovec(&iov, &iovlen, "errmsg", errmsg,
 366                             sizeof(errmsg));
 367                         build_iovec(&iov, &iovlen, "update", NULL, 0);
 368                         build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
 369
 370                         while (nmount(iov, iovlen, mntp->f_flags) < 0) {
 371                                 if (errno == EEXIST && unlink(snapname) == 0)
 372                                         continue;
 373                                 bkgrdflag = 0;
 374                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
 375                                     snapname, strerror(errno), errmsg);
 376                                 break;
 377                         }
 378                         if (bkgrdflag != 0)
 379                                 filesys = snapname;
 380                 }
 381         }
 382
 383         switch (setup(filesys)) {
 384         case 0:
 385                 if (preen)
 386                         pfatal("CAN'T CHECK FILE SYSTEM.");
 387                 return (0);
 388         case -1:
 389         clean:
 390                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 391                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 392                 printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
 393                     (intmax_t)sblock.fs_cstotal.cs_nffree,
 394                     (intmax_t)sblock.fs_cstotal.cs_nbfree,
 395                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 396                 return (0);
 397         }
 398         /*
 399          * Determine if we can and should do journal recovery.
 400          */
 401         if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
 402                 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
 403                         if (preen || reply("USE JOURNAL")) {
 404                                 if (suj_check(filesys) == 0) {
 405                                         printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
 406                                         if (chkdoreload(mntp) == 0)
 407                                                 exit(0);
 408                                         exit(4);
 409                                 }
 410                         }
 411                         printf("** Skipping journal, falling through to full fsck\n\n");
 412                 }
 413                 /*
 414                  * Write the superblock so we don't try to recover the
 415                  * journal on another pass.
 416                  */
 417                 sblock.fs_mtime = time(NULL);
 418                 sbdirty();
 419         }
 420
 421         /*
 422          * Cleared if any questions answered no. Used to decide if
 423          * the superblock should be marked clean.
 424          */
 425         resolved = 1;
 426         /*
 427          * 1: scan inodes tallying blocks used
 428          */
 429         if (preen == 0) {
 430                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 431                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 432                         printf("** Root file system\n");
 433                 printf("** Phase 1 - Check Blocks and Sizes\n");
 434         }
 435         clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
 436         pass1();
 437         IOstats("Pass1");
 438
 439         /*
 440          * 1b: locate first references to duplicates, if any
 441          */
 442         if (duplist) {
 443                 if (preen || usedsoftdep)
 444                         pfatal("INTERNAL ERROR: dups with %s%s%s",
 445                             preen ? "-p" : "",
 446                             (preen && usedsoftdep) ? " and " : "",
 447                             usedsoftdep ? "softupdates" : "");
 448                 printf("** Phase 1b - Rescan For More DUPS\n");
 449                 pass1b();
 450                 IOstats("Pass1b");
 451         }
 452
 453         /*
 454          * 2: traverse directories from root to mark all connected directories
 455          */
 456         if (preen == 0)
 457                 printf("** Phase 2 - Check Pathnames\n");
 458         pass2();
 459         IOstats("Pass2");
 460
 461         /*
 462          * 3: scan inodes looking for disconnected directories
 463          */
 464         if (preen == 0)
 465                 printf("** Phase 3 - Check Connectivity\n");
 466         pass3();
 467         IOstats("Pass3");
 468
 469         /*
 470          * 4: scan inodes looking for disconnected files; check reference counts
 471          */
 472         if (preen == 0)
 473                 printf("** Phase 4 - Check Reference Counts\n");
 474         pass4();
 475         IOstats("Pass4");
 476
 477         /*
 478          * 5: check and repair resource counts in cylinder groups
 479          */
 480         if (preen == 0)
 481                 printf("** Phase 5 - Check Cyl groups\n");
 482         pass5();
 483         IOstats("Pass5");
 484
 485         /*
 486          * print out summary statistics
 487          */
 488         n_ffree = sblock.fs_cstotal.cs_nffree;
 489         n_bfree = sblock.fs_cstotal.cs_nbfree;
 490         files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 491         blks = n_blks +
 492             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 493         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 494         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 495         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 496         if (bkgrdflag && (files > 0 || blks > 0)) {
 497                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 498                 pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
 499                     countdirs, files - countdirs, blks);
 500         }
 501         pwarn("%ld files, %jd used, %ju free ",
 502             (long)n_files, (intmax_t)n_blks,
 503             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 504         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 505             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 506             n_ffree * 100.0 / sblock.fs_dsize);
 507         if (debug) {
 508                 if (files < 0)
 509                         printf("%jd inodes missing\n", -files);
 510                 if (blks < 0)
 511                         printf("%jd blocks missing\n", -blks);
 512                 if (duplist != NULL) {
 513                         printf("The following duplicate blocks remain:");
 514                         for (dp = duplist; dp; dp = dp->next)
 515                                 printf(" %jd,", (intmax_t)dp->dup);
 516                         printf("\n");
 517                 }
 518         }
 519         duplist = (struct dups *)0;
 520         muldup = (struct dups *)0;
 521         inocleanup();
 522         if (fsmodified) {
 523                 sblock.fs_time = time(NULL);
 524                 sbdirty();
 525         }
 526         if (cvtlevel && sblk.b_dirty) {
 527                 /*
 528                  * Write out the duplicate super blocks
 529                  */
 530                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 531                         blwrite(fswritefd, (char *)&sblock,
 532                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 533                             SBLOCKSIZE);
 534         }
 535         if (rerun)
 536                 resolved = 0;
 537         finalIOstats();
 538
 539         /*
 540          * Check to see if the file system is mounted read-write.
 541          */
 542         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 543                 resolved = 0;
 544         ckfini(resolved);
 545
 546         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 547                 if (inostathead[cylno].il_stat != NULL)
 548                         free((char *)inostathead[cylno].il_stat);
 549         free((char *)inostathead);
 550         inostathead = NULL;
 551         if (fsmodified && !preen)
 552                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 553         if (rerun)
 554                 printf("\n***** PLEASE RERUN FSCK *****\n");
 555         if (chkdoreload(mntp) != 0) {
 556                 if (!fsmodified)
 557                         return (0);
 558                 if (!preen)
 559                         printf("\n***** REBOOT NOW *****\n");
 560                 sync();
 561                 return (4);
 562         }
 563         return (0);
 564 }
 565
 566 static int
 567 chkdoreload(struct statfs *mntp)
 568 {
 569         struct iovec *iov;
 570         int iovlen;
 571         char errmsg[255];
 572
 573         if (mntp == NULL)
 574                 return (0);
 575
 576         iov = NULL;
 577         iovlen = 0;
 578         errmsg[0] = '\0';
 579         /*
 580          * We modified a mounted file system.  Do a mount update on
 581          * it unless it is read-write, so we can continue using it
 582          * as safely as possible.
 583          */
 584         if (mntp->f_flags & MNT_RDONLY) {
 585                 build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 586                 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
 587                     (size_t)-1);
 588                 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 589                     (size_t)-1);
 590                 build_iovec(&iov, &iovlen, "errmsg", errmsg,
 591                     sizeof(errmsg));
 592                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 593                 build_iovec(&iov, &iovlen, "reload", NULL, 0);
 594                 /*
 595                  * XX: We need the following line until we clean up
 596                  * nmount parsing of root mounts and NFS root mounts.
 597                  */
 598                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 599                 if (nmount(iov, iovlen, mntp->f_flags) == 0) {
 600                         return (0);
 601                 }
 602                 pwarn("mount reload of '%s' failed: %s %s\n\n",
 603                     mntp->f_mntonname, strerror(errno), errmsg);
 604                 return (1);
 605         }
 606         return (0);
 607 }
 608
 609 /*
 610  * Get the mount point information for name.
 611  */
 612 static struct statfs *
 613 getmntpt(const char *name)
 614 {
 615         struct stat devstat, mntdevstat;
 616         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 617         char *ddevname;
 618         struct statfs *mntbuf, *statfsp;
 619         int i, mntsize, isdev;
 620
 621         if (stat(name, &devstat) != 0)
 622                 return (NULL);
 623         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 624                 isdev = 1;
 625         else
 626                 isdev = 0;
 627         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 628         for (i = 0; i < mntsize; i++) {
 629                 statfsp = &mntbuf[i];
 630                 ddevname = statfsp->f_mntfromname;
 631                 if (*ddevname != '/') {
 632                         strcpy(device, _PATH_DEV);
 633                         strcat(device, ddevname);
 634                         strcpy(statfsp->f_mntfromname, device);
 635                 }
 636                 if (isdev == 0) {
 637                         if (strcmp(name, statfsp->f_mntonname))
 638                                 continue;
 639                         return (statfsp);
 640                 }
 641                 if (stat(ddevname, &mntdevstat) == 0 &&
 642                     mntdevstat.st_rdev == devstat.st_rdev)
 643                         return (statfsp);
 644         }
 645         statfsp = NULL;
 646         return (statfsp);
 647 }
 648
 649 static void
 650 usage(void)
 651 {
 652         (void) fprintf(stderr,
 653 "usage: %s [-BEFfnpry] [-b block] [-c level] [-m mode] filesystem ...\n",
 654             getprogname());
 655         exit(1);
 656 }