sbin/fsck_ffs/main.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if 0
  31 #ifndef lint
  32 static const char copyright[] =
  33 "@(#) Copyright (c) 1980, 1986, 1993\n\
  34         The Regents of the University of California.  All rights reserved.\n";
  35 #endif /* not lint */
  36
  37 #ifndef lint
  38 static char sccsid[] = "@(#)main.c      8.6 (Berkeley) 5/14/95";
  39 #endif /* not lint */
  40 #endif
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 #include <sys/param.h>
  45 #include <sys/stat.h>
  46 #include <sys/file.h>
  47 #include <sys/time.h>
  48 #include <sys/mount.h>
  49 #include <sys/resource.h>
  50 #include <sys/sysctl.h>
  51 #include <sys/uio.h>
  52 #include <sys/disklabel.h>
  53
  54 #include <ufs/ufs/dinode.h>
  55 #include <ufs/ffs/fs.h>
  56
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <fstab.h>
  60 #include <grp.h>
  61 #include <mntopts.h>
  62 #include <paths.h>
  63 #include <stdint.h>
  64 #include <string.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         damagedflag = 0;
  85         while ((ch = getopt(argc, argv, "b:Bc:CdDfFm:npy")) != -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 'D':
 110                         damagedflag = 1;
 111                         /* FALLTHROUGH */
 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 'y':
 142                         yflag++;
 143                         nflag = 0;
 144                         break;
 145
 146                 default:
 147                         usage();
 148                 }
 149         }
 150         argc -= optind;
 151         argv += optind;
 152
 153         if (!argc)
 154                 usage();
 155
 156         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 157                 (void)signal(SIGINT, catch);
 158         if (ckclean)
 159                 (void)signal(SIGQUIT, catchquit);
 160         signal(SIGINFO, infohandler);
 161         if (bkgrdflag) {
 162                 signal(SIGALRM, alarmhandler);
 163                 itimerval.it_interval.tv_sec = 5;
 164                 itimerval.it_interval.tv_usec = 0;
 165                 itimerval.it_value.tv_sec = 5;
 166                 itimerval.it_value.tv_usec = 0;
 167                 setitimer(ITIMER_REAL, &itimerval, NULL);
 168         }
 169         /*
 170          * Push up our allowed memory limit so we can cope
 171          * with huge file systems.
 172          */
 173         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 174                 rlimit.rlim_cur = rlimit.rlim_max;
 175                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 176         }
 177         while (argc-- > 0)
 178                 (void)checkfilesys(*argv++);
 179
 180         if (returntosingle)
 181                 ret = 2;
 182         exit(ret);
 183 }
 184
 185 static int
 186 argtoi(int flag, const char *req, const char *str, int base)
 187 {
 188         char *cp;
 189         int ret;
 190
 191         ret = (int)strtol(str, &cp, base);
 192         if (cp == str || *cp)
 193                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 194         return (ret);
 195 }
 196
 197 /*
 198  * Check the specified file system.
 199  */
 200 /* ARGSUSED */
 201 static int
 202 checkfilesys(char *filesys)
 203 {
 204         ufs2_daddr_t n_ffree, n_bfree;
 205         struct dups *dp;
 206         struct statfs *mntp;
 207         struct stat snapdir;
 208         struct group *grp;
 209         ufs2_daddr_t blks;
 210         struct iovec *iov;
 211         char errmsg[255];
 212         int iovlen;
 213         int fflags;
 214         int cylno;
 215         ino_t files;
 216         size_t size;
 217
 218         iov = NULL;
 219         iovlen = 0;
 220         errmsg[0] = '\0';
 221
 222         cdevname = filesys;
 223         if (debug && ckclean)
 224                 pwarn("starting\n");
 225         /*
 226          * Make best effort to get the disk name. Check first to see
 227          * if it is listed among the mounted file systems. Failing that
 228          * check to see if it is listed in /etc/fstab.
 229          */
 230         mntp = getmntpt(filesys);
 231         if (mntp != NULL)
 232                 filesys = mntp->f_mntfromname;
 233         else
 234                 filesys = blockcheck(filesys);
 235         /*
 236          * If -F flag specified, check to see whether a background check
 237          * is possible and needed. If possible and needed, exit with
 238          * status zero. Otherwise exit with status non-zero. A non-zero
 239          * exit status will cause a foreground check to be run.
 240          */
 241         sblock_init();
 242         if (bkgrdcheck) {
 243                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 244                         exit(3);        /* Cannot read superblock */
 245                 close(fsreadfd);
 246                 if (sblock.fs_flags & FS_NEEDSFSCK)
 247                         exit(4);        /* Earlier background failed */
 248                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 249                         exit(5);        /* Not running soft updates */
 250                 size = MIBSIZE;
 251                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 252                         exit(6);        /* Lacks kernel support */
 253                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 254                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 255                         exit(7);        /* Filesystem clean, report it now */
 256                 exit(0);
 257         }
 258         if (ckclean && skipclean) {
 259                 /*
 260                  * If file system is gjournaled, check it here.
 261                  */
 262                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 263                         exit(3);        /* Cannot read superblock */
 264                 close(fsreadfd);
 265                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 266                         //printf("GJournaled file system detected on %s.\n",
 267                         //    filesys);
 268                         if (sblock.fs_clean == 1) {
 269                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 270                                 exit(0);
 271                         }
 272                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 273                                 gjournal_check(filesys);
 274                                 if (chkdoreload(mntp) == 0)
 275                                         exit(0);
 276                                 exit(4);
 277                         } else {
 278                                 pfatal("UNEXPECTED INCONSISTENCY, %s\n",
 279                                     "CANNOT RUN FAST FSCK\n");
 280                         }
 281                 }
 282         }
 283         /*
 284          * If we are to do a background check:
 285          *      Get the mount point information of the file system
 286          *      create snapshot file
 287          *      return created snapshot file
 288          *      if not found, clear bkgrdflag and proceed with normal fsck
 289          */
 290         if (bkgrdflag) {
 291                 if (mntp == NULL) {
 292                         bkgrdflag = 0;
 293                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 294                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 295                         bkgrdflag = 0;
 296                         pfatal("NOT USING SOFT UPDATES, %s\n",
 297                             "CANNOT RUN IN BACKGROUND");
 298                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 299                         bkgrdflag = 0;
 300                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 301                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 302                         if (readsb(0) != 0) {
 303                                 if (sblock.fs_flags & FS_NEEDSFSCK) {
 304                                         bkgrdflag = 0;
 305                                         pfatal("UNEXPECTED INCONSISTENCY, %s\n",
 306                                             "CANNOT RUN IN BACKGROUND\n");
 307                                 }
 308                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 309                                     skipclean && ckclean) {
 310                                         /*
 311                                          * file system is clean;
 312                                          * skip snapshot and report it clean
 313                                          */
 314                                         pwarn("FILE SYSTEM CLEAN; %s\n",
 315                                             "SKIPPING CHECKS");
 316                                         goto clean;
 317                                 }
 318                         }
 319                         close(fsreadfd);
 320                 }
 321                 if (bkgrdflag) {
 322                         snprintf(snapname, sizeof snapname, "%s/.snap",
 323                             mntp->f_mntonname);
 324                         if (stat(snapname, &snapdir) < 0) {
 325                                 if (errno != ENOENT) {
 326                                         bkgrdflag = 0;
 327                                         pfatal("CANNOT FIND %s %s: %s, %s\n",
 328                                             "SNAPSHOT DIRECTORY",
 329                                             snapname, strerror(errno),
 330                                             "CANNOT RUN IN BACKGROUND");
 331                                 } else if ((grp = getgrnam("operator")) == 0 ||
 332                                     mkdir(snapname, 0770) < 0 ||
 333                                     chown(snapname, -1, grp->gr_gid) < 0 ||
 334                                     chmod(snapname, 0770) < 0) {
 335                                         bkgrdflag = 0;
 336                                         pfatal("CANNOT CREATE %s %s: %s, %s\n",
 337                                             "SNAPSHOT DIRECTORY",
 338                                             snapname, strerror(errno),
 339                                             "CANNOT RUN IN BACKGROUND");
 340                                 }
 341                         } else if (!S_ISDIR(snapdir.st_mode)) {
 342                                 bkgrdflag = 0;
 343                                 pfatal("%s IS NOT A DIRECTORY, %s\n", snapname,
 344                                     "CANNOT RUN IN BACKGROUND");
 345                         }
 346                 }
 347                 if (bkgrdflag) {
 348                         snprintf(snapname, sizeof snapname,
 349                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 350                         fflags = mntp->f_flags;
 351                         /*
 352                          * XXX: Need to kick out MNT_ROOTFS until we fix
 353                          * nmount().
 354                          */
 355                         fflags &= ~MNT_ROOTFS;
 356                         fflags = fflags | MNT_UPDATE | MNT_SNAPSHOT;
 357                         build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 358                         build_iovec(&iov, &iovlen, "from", snapname,
 359                             (size_t)-1);
 360                         build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 361                             (size_t)-1);
 362                         build_iovec(&iov, &iovlen, "errmsg", errmsg,
 363                             sizeof(errmsg));
 364
 365                         while (nmount(iov, iovlen, fflags) < 0) {
 366                                 if (errno == EEXIST && unlink(snapname) == 0)
 367                                         continue;
 368                                 bkgrdflag = 0;
 369                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
 370                                     snapname, strerror(errno), errmsg);
 371                                 break;
 372                         }
 373                         if (bkgrdflag != 0)
 374                                 filesys = snapname;
 375                 }
 376         }
 377
 378         switch (setup(filesys)) {
 379         case 0:
 380                 if (preen)
 381                         pfatal("CAN'T CHECK FILE SYSTEM.");
 382                 return (0);
 383         case -1:
 384         clean:
 385                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 386                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 387                 printf("(%lld frags, %lld blocks, %.1f%% fragmentation)\n",
 388                     (long long)sblock.fs_cstotal.cs_nffree,
 389                     (long long)sblock.fs_cstotal.cs_nbfree,
 390                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 391                 return (0);
 392         }
 393
 394         /*
 395          * Cleared if any questions answered no. Used to decide if
 396          * the superblock should be marked clean.
 397          */
 398         resolved = 1;
 399         /*
 400          * 1: scan inodes tallying blocks used
 401          */
 402         if (preen == 0) {
 403                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 404                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 405                         printf("** Root file system\n");
 406                 printf("** Phase 1 - Check Blocks and Sizes\n");
 407         }
 408         pass1();
 409
 410         /*
 411          * 1b: locate first references to duplicates, if any
 412          */
 413         if (duplist) {
 414                 if (preen || usedsoftdep)
 415                         pfatal("INTERNAL ERROR: dups with -p");
 416                 printf("** Phase 1b - Rescan For More DUPS\n");
 417                 pass1b();
 418         }
 419
 420         /*
 421          * 2: traverse directories from root to mark all connected directories
 422          */
 423         if (preen == 0)
 424                 printf("** Phase 2 - Check Pathnames\n");
 425         pass2();
 426
 427         /*
 428          * 3: scan inodes looking for disconnected directories
 429          */
 430         if (preen == 0)
 431                 printf("** Phase 3 - Check Connectivity\n");
 432         pass3();
 433
 434         /*
 435          * 4: scan inodes looking for disconnected files; check reference counts
 436          */
 437         if (preen == 0)
 438                 printf("** Phase 4 - Check Reference Counts\n");
 439         pass4();
 440
 441         /*
 442          * 5: check and repair resource counts in cylinder groups
 443          */
 444         if (preen == 0)
 445                 printf("** Phase 5 - Check Cyl groups\n");
 446         pass5();
 447
 448         /*
 449          * print out summary statistics
 450          */
 451         n_ffree = sblock.fs_cstotal.cs_nffree;
 452         n_bfree = sblock.fs_cstotal.cs_nbfree;
 453         files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 454         blks = n_blks +
 455             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 456         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 457         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 458         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 459         if (bkgrdflag && (files > 0 || blks > 0)) {
 460                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 461                 pwarn("Reclaimed: %ld directories, %ld files, %lld fragments\n",
 462                     countdirs, (long)files - countdirs, (long long)blks);
 463         }
 464         pwarn("%ld files, %jd used, %ju free ",
 465             (long)n_files, (intmax_t)n_blks,
 466             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 467         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 468             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 469             n_ffree * 100.0 / sblock.fs_dsize);
 470         if (debug) {
 471                 if (files < 0)
 472                         printf("%d inodes missing\n", -files);
 473                 if (blks < 0)
 474                         printf("%lld blocks missing\n", -(long long)blks);
 475                 if (duplist != NULL) {
 476                         printf("The following duplicate blocks remain:");
 477                         for (dp = duplist; dp; dp = dp->next)
 478                                 printf(" %lld,", (long long)dp->dup);
 479                         printf("\n");
 480                 }
 481         }
 482         duplist = (struct dups *)0;
 483         muldup = (struct dups *)0;
 484         inocleanup();
 485         if (fsmodified) {
 486                 sblock.fs_time = time(NULL);
 487                 sbdirty();
 488         }
 489         if (cvtlevel && sblk.b_dirty) {
 490                 /*
 491                  * Write out the duplicate super blocks
 492                  */
 493                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 494                         blwrite(fswritefd, (char *)&sblock,
 495                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 496                             SBLOCKSIZE);
 497         }
 498         if (rerun)
 499                 resolved = 0;
 500
 501         /*
 502          * Check to see if the file system is mounted read-write.
 503          */
 504         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 505                 resolved = 0;
 506         ckfini(resolved);
 507
 508         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 509                 if (inostathead[cylno].il_stat != NULL)
 510                         free((char *)inostathead[cylno].il_stat);
 511         free((char *)inostathead);
 512         inostathead = NULL;
 513         if (fsmodified && !preen)
 514                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 515         if (rerun)
 516                 printf("\n***** PLEASE RERUN FSCK *****\n");
 517         if (chkdoreload(mntp) != 0) {
 518                 if (!fsmodified)
 519                         return (0);
 520                 if (!preen)
 521                         printf("\n***** REBOOT NOW *****\n");
 522                 sync();
 523                 return (4);
 524         }
 525         return (0);
 526 }
 527
 528 static int
 529 chkdoreload(struct statfs *mntp)
 530 {
 531         struct iovec *iov;
 532         int iovlen;
 533         int fflags;
 534         char errmsg[255];
 535
 536         if (mntp == NULL)
 537                 return (0);
 538
 539         iov = NULL;
 540         iovlen = 0;
 541         errmsg[0] = '\0';
 542         fflags = mntp->f_flags;
 543         /*
 544          * We modified a mounted file system.  Do a mount update on
 545          * it unless it is read-write, so we can continue using it
 546          * as safely as possible.
 547          */
 548         if (mntp->f_flags & MNT_RDONLY) {
 549                 /*
 550                  * XXX: Need to kick out MNT_ROOTFS until we fix
 551                  * nmount().
 552                  */
 553                 fflags &= ~MNT_ROOTFS;
 554                 fflags = fflags | MNT_RELOAD;
 555                 build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 556                 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
 557                     (size_t)-1);
 558                 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 559                     (size_t)-1);
 560                 build_iovec(&iov, &iovlen, "errmsg", errmsg,
 561                     sizeof(errmsg));
 562                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 563                 /*
 564                  * XX: We need the following line until we clean up
 565                  * nmount parsing of root mounts and NFS root mounts.
 566                  */
 567                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 568                 if (nmount(iov, iovlen, fflags) == 0) {
 569                         return (0);
 570                 }
 571                 pwarn("mount reload of '%s' failed: %s %s\n\n",
 572                     mntp->f_mntonname, strerror(errno), errmsg);
 573                 return (1);
 574         }
 575         return (0);
 576 }
 577
 578 /*
 579  * Get the mount point information for name.
 580  */
 581 static struct statfs *
 582 getmntpt(const char *name)
 583 {
 584         struct stat devstat, mntdevstat;
 585         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 586         char *ddevname;
 587         struct statfs *mntbuf, *statfsp;
 588         int i, mntsize, isdev;
 589
 590         if (stat(name, &devstat) != 0)
 591                 return (NULL);
 592         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 593                 isdev = 1;
 594         else
 595                 isdev = 0;
 596         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 597         for (i = 0; i < mntsize; i++) {
 598                 statfsp = &mntbuf[i];
 599                 ddevname = statfsp->f_mntfromname;
 600                 if (*ddevname != '/') {
 601                         strcpy(device, _PATH_DEV);
 602                         strcat(device, ddevname);
 603                         strcpy(statfsp->f_mntfromname, device);
 604                 }
 605                 if (isdev == 0) {
 606                         if (strcmp(name, statfsp->f_mntonname))
 607                                 continue;
 608                         return (statfsp);
 609                 }
 610                 if (stat(ddevname, &mntdevstat) == 0 &&
 611                     mntdevstat.st_rdev == devstat.st_rdev)
 612                         return (statfsp);
 613         }
 614         statfsp = NULL;
 615         return (statfsp);
 616 }
 617
 618 static void
 619 usage(void)
 620 {
 621         (void) fprintf(stderr,
 622             "usage: %s [-BCFpfny] [-b block] [-c level] [-m mode] "
 623                         "filesystem ...\n",
 624             getprogname());
 625         exit(1);
 626 }