sbin/fsck_ffs/main.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1980, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if 0
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1980, 1986, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 static char sccsid[] = "@(#)main.c      8.6 (Berkeley) 5/14/95";
  41 #endif /* not lint */
  42 #endif
  43 #include <sys/cdefs.h>
  44 __FBSDID("$FreeBSD$");
  45
  46 #include <sys/param.h>
  47 #include <sys/file.h>
  48 #include <sys/mount.h>
  49 #include <sys/resource.h>
  50 #include <sys/stat.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/uio.h>
  53 #include <sys/disklabel.h>
  54
  55 #include <ufs/ufs/dinode.h>
  56 #include <ufs/ffs/fs.h>
  57
  58 #include <err.h>
  59 #include <errno.h>
  60 #include <fstab.h>
  61 #include <grp.h>
  62 #include <inttypes.h>
  63 #include <mntopts.h>
  64 #include <paths.h>
  65 #include <stdint.h>
  66 #include <string.h>
  67 #include <time.h>
  68
  69 #include "fsck.h"
  70
  71 int     restarts;
  72
  73 static void usage(void) __dead2;
  74 static intmax_t argtoimax(int flag, const char *req, const char *str, int base);
  75 static int checkfilesys(char *filesys);
  76 static int chkdoreload(struct statfs *mntp);
  77 static struct statfs *getmntpt(const char *);
  78
  79 int
  80 main(int argc, char *argv[])
  81 {
  82         int ch;
  83         struct rlimit rlimit;
  84         struct itimerval itimerval;
  85         int ret = 0;
  86
  87         sync();
  88         skipclean = 1;
  89         inoopt = 0;
  90         while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZ")) != -1) {
  91                 switch (ch) {
  92                 case 'b':
  93                         skipclean = 0;
  94                         bflag = argtoimax('b', "number", optarg, 10);
  95                         printf("Alternate super block location: %jd\n", bflag);
  96                         break;
  97
  98                 case 'B':
  99                         bkgrdflag = 1;
 100                         break;
 101
 102                 case 'c':
 103                         skipclean = 0;
 104                         cvtlevel = argtoimax('c', "conversion level", optarg,
 105                             10);
 106                         if (cvtlevel < 3)
 107                                 errx(EEXIT, "cannot do level %d conversion",
 108                                     cvtlevel);
 109                         break;
 110
 111                 case 'd':
 112                         debug++;
 113                         break;
 114
 115                 case 'E':
 116                         Eflag++;
 117                         break;
 118
 119                 case 'f':
 120                         skipclean = 0;
 121                         break;
 122
 123                 case 'F':
 124                         bkgrdcheck = 1;
 125                         break;
 126
 127                 case 'm':
 128                         lfmode = argtoimax('m', "mode", optarg, 8);
 129                         if (lfmode &~ 07777)
 130                                 errx(EEXIT, "bad mode to -m: %o", lfmode);
 131                         printf("** lost+found creation mode %o\n", lfmode);
 132                         break;
 133
 134                 case 'n':
 135                         nflag++;
 136                         yflag = 0;
 137                         break;
 138
 139                 case 'p':
 140                         preen++;
 141                         /*FALLTHROUGH*/
 142
 143                 case 'C':
 144                         ckclean++;
 145                         break;
 146
 147                 case 'R':
 148                         wantrestart = 1;
 149                         break;
 150                 case 'r':
 151                         inoopt++;
 152                         break;
 153
 154                 case 'S':
 155                         surrender = 1;
 156                         break;
 157
 158                 case 'y':
 159                         yflag++;
 160                         nflag = 0;
 161                         break;
 162
 163                 case 'Z':
 164                         Zflag++;
 165                         break;
 166
 167                 default:
 168                         usage();
 169                 }
 170         }
 171         argc -= optind;
 172         argv += optind;
 173
 174         if (!argc)
 175                 usage();
 176
 177         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 178                 (void)signal(SIGINT, catch);
 179         if (ckclean)
 180                 (void)signal(SIGQUIT, catchquit);
 181         signal(SIGINFO, infohandler);
 182         if (bkgrdflag) {
 183                 signal(SIGALRM, alarmhandler);
 184                 itimerval.it_interval.tv_sec = 5;
 185                 itimerval.it_interval.tv_usec = 0;
 186                 itimerval.it_value.tv_sec = 5;
 187                 itimerval.it_value.tv_usec = 0;
 188                 setitimer(ITIMER_REAL, &itimerval, NULL);
 189         }
 190         /*
 191          * Push up our allowed memory limit so we can cope
 192          * with huge file systems.
 193          */
 194         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 195                 rlimit.rlim_cur = rlimit.rlim_max;
 196                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 197         }
 198         while (argc > 0) {
 199                 if (checkfilesys(*argv) == ERESTART)
 200                         continue;
 201                 argc--;
 202                 argv++;
 203         }
 204
 205         if (returntosingle)
 206                 ret = 2;
 207         exit(ret);
 208 }
 209
 210 static intmax_t
 211 argtoimax(int flag, const char *req, const char *str, int base)
 212 {
 213         char *cp;
 214         intmax_t ret;
 215
 216         ret = strtoimax(str, &cp, base);
 217         if (cp == str || *cp)
 218                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 219         return (ret);
 220 }
 221
 222 /*
 223  * Check the specified file system.
 224  */
 225 /* ARGSUSED */
 226 static int
 227 checkfilesys(char *filesys)
 228 {
 229         ufs2_daddr_t n_ffree, n_bfree;
 230         struct dups *dp;
 231         struct statfs *mntp;
 232         struct stat snapdir;
 233         struct group *grp;
 234         struct iovec *iov;
 235         char errmsg[255];
 236         int ofsmodified;
 237         int iovlen;
 238         int cylno;
 239         intmax_t blks, files;
 240         size_t size;
 241
 242         iov = NULL;
 243         iovlen = 0;
 244         errmsg[0] = '\0';
 245         fsutilinit();
 246         fsckinit();
 247
 248         cdevname = filesys;
 249         if (debug && ckclean)
 250                 pwarn("starting\n");
 251         /*
 252          * Make best effort to get the disk name. Check first to see
 253          * if it is listed among the mounted file systems. Failing that
 254          * check to see if it is listed in /etc/fstab.
 255          */
 256         mntp = getmntpt(filesys);
 257         if (mntp != NULL)
 258                 filesys = mntp->f_mntfromname;
 259         else
 260                 filesys = blockcheck(filesys);
 261         /*
 262          * If -F flag specified, check to see whether a background check
 263          * is possible and needed. If possible and needed, exit with
 264          * status zero. Otherwise exit with status non-zero. A non-zero
 265          * exit status will cause a foreground check to be run.
 266          */
 267         sblock_init();
 268         if (bkgrdcheck) {
 269                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 270                         exit(3);        /* Cannot read superblock */
 271                 close(fsreadfd);
 272                 /* Earlier background failed or journaled */
 273                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
 274                         exit(4);
 275                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 276                         exit(5);        /* Not running soft updates */
 277                 size = MIBSIZE;
 278                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 279                         exit(6);        /* Lacks kernel support */
 280                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 281                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 282                         exit(7);        /* Filesystem clean, report it now */
 283                 exit(0);
 284         }
 285         if (ckclean && skipclean) {
 286                 /*
 287                  * If file system is gjournaled, check it here.
 288                  */
 289                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 290                         exit(3);        /* Cannot read superblock */
 291                 close(fsreadfd);
 292                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 293                         //printf("GJournaled file system detected on %s.\n",
 294                         //    filesys);
 295                         if (sblock.fs_clean == 1) {
 296                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 297                                 exit(0);
 298                         }
 299                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 300                                 gjournal_check(filesys);
 301                                 if (chkdoreload(mntp) == 0)
 302                                         exit(0);
 303                                 exit(4);
 304                         } else {
 305                                 pfatal(
 306                             "UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
 307                         }
 308                 }
 309         }
 310         /*
 311          * If we are to do a background check:
 312          *      Get the mount point information of the file system
 313          *      create snapshot file
 314          *      return created snapshot file
 315          *      if not found, clear bkgrdflag and proceed with normal fsck
 316          */
 317         if (bkgrdflag) {
 318                 if (mntp == NULL) {
 319                         bkgrdflag = 0;
 320                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 321                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 322                         bkgrdflag = 0;
 323                         pfatal(
 324                           "NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
 325                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 326                         bkgrdflag = 0;
 327                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 328                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 329                         if (readsb(0) != 0) {
 330                                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
 331                                         bkgrdflag = 0;
 332                                         pfatal(
 333                         "UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
 334                                 }
 335                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 336                                     skipclean && ckclean) {
 337                                         /*
 338                                          * file system is clean;
 339                                          * skip snapshot and report it clean
 340                                          */
 341                                         pwarn(
 342                                         "FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 343                                         goto clean;
 344                                 }
 345                         }
 346                         close(fsreadfd);
 347                 }
 348                 if (bkgrdflag) {
 349                         snprintf(snapname, sizeof snapname, "%s/.snap",
 350                             mntp->f_mntonname);
 351                         if (stat(snapname, &snapdir) < 0) {
 352                                 if (errno != ENOENT) {
 353                                         bkgrdflag = 0;
 354                                         pfatal(
 355         "CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 356                                             snapname, strerror(errno));
 357                                 } else if ((grp = getgrnam("operator")) == NULL ||
 358                                            mkdir(snapname, 0770) < 0 ||
 359                                            chown(snapname, -1, grp->gr_gid) < 0 ||
 360                                            chmod(snapname, 0770) < 0) {
 361                                         bkgrdflag = 0;
 362                                         pfatal(
 363         "CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 364                                             snapname, strerror(errno));
 365                                 }
 366                         } else if (!S_ISDIR(snapdir.st_mode)) {
 367                                 bkgrdflag = 0;
 368                                 pfatal(
 369                         "%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
 370                                     snapname);
 371                         }
 372                 }
 373                 if (bkgrdflag) {
 374                         snprintf(snapname, sizeof snapname,
 375                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 376                         build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 377                         build_iovec(&iov, &iovlen, "from", snapname,
 378                             (size_t)-1);
 379                         build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 380                             (size_t)-1);
 381                         build_iovec(&iov, &iovlen, "errmsg", errmsg,
 382                             sizeof(errmsg));
 383                         build_iovec(&iov, &iovlen, "update", NULL, 0);
 384                         build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
 385
 386                         while (nmount(iov, iovlen, mntp->f_flags) < 0) {
 387                                 if (errno == EEXIST && unlink(snapname) == 0)
 388                                         continue;
 389                                 bkgrdflag = 0;
 390                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
 391                                     snapname, strerror(errno), errmsg);
 392                                 break;
 393                         }
 394                         if (bkgrdflag != 0)
 395                                 filesys = snapname;
 396                 }
 397         }
 398
 399         switch (setup(filesys)) {
 400         case 0:
 401                 if (preen)
 402                         pfatal("CAN'T CHECK FILE SYSTEM.");
 403                 return (0);
 404         case -1:
 405         clean:
 406                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 407                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 408                 printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
 409                     (intmax_t)sblock.fs_cstotal.cs_nffree,
 410                     (intmax_t)sblock.fs_cstotal.cs_nbfree,
 411                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 412                 return (0);
 413         }
 414         /*
 415          * Determine if we can and should do journal recovery.
 416          */
 417         if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
 418                 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
 419                         if (preen || reply("USE JOURNAL")) {
 420                                 if (suj_check(filesys) == 0) {
 421                                         printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
 422                                         if (chkdoreload(mntp) == 0)
 423                                                 exit(0);
 424                                         exit(4);
 425                                 }
 426                         }
 427                         printf("** Skipping journal, falling through to full fsck\n\n");
 428                 }
 429                 /*
 430                  * Write the superblock so we don't try to recover the
 431                  * journal on another pass. If this is the only change
 432                  * to the filesystem, we do not want it to be called
 433                  * out as modified.
 434                  */
 435                 sblock.fs_mtime = time(NULL);
 436                 sbdirty();
 437                 ofsmodified = fsmodified;
 438                 flush(fswritefd, &sblk);
 439                 fsmodified = ofsmodified;
 440         }
 441
 442         /*
 443          * Cleared if any questions answered no. Used to decide if
 444          * the superblock should be marked clean.
 445          */
 446         resolved = 1;
 447         /*
 448          * 1: scan inodes tallying blocks used
 449          */
 450         if (preen == 0) {
 451                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 452                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 453                         printf("** Root file system\n");
 454                 printf("** Phase 1 - Check Blocks and Sizes\n");
 455         }
 456         clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
 457         pass1();
 458         IOstats("Pass1");
 459
 460         /*
 461          * 1b: locate first references to duplicates, if any
 462          */
 463         if (duplist) {
 464                 if (preen || usedsoftdep)
 465                         pfatal("INTERNAL ERROR: dups with %s%s%s",
 466                             preen ? "-p" : "",
 467                             (preen && usedsoftdep) ? " and " : "",
 468                             usedsoftdep ? "softupdates" : "");
 469                 printf("** Phase 1b - Rescan For More DUPS\n");
 470                 pass1b();
 471                 IOstats("Pass1b");
 472         }
 473
 474         /*
 475          * 2: traverse directories from root to mark all connected directories
 476          */
 477         if (preen == 0)
 478                 printf("** Phase 2 - Check Pathnames\n");
 479         pass2();
 480         IOstats("Pass2");
 481
 482         /*
 483          * 3: scan inodes looking for disconnected directories
 484          */
 485         if (preen == 0)
 486                 printf("** Phase 3 - Check Connectivity\n");
 487         pass3();
 488         IOstats("Pass3");
 489
 490         /*
 491          * 4: scan inodes looking for disconnected files; check reference counts
 492          */
 493         if (preen == 0)
 494                 printf("** Phase 4 - Check Reference Counts\n");
 495         pass4();
 496         IOstats("Pass4");
 497
 498         /*
 499          * 5: check and repair resource counts in cylinder groups
 500          */
 501         if (preen == 0)
 502                 printf("** Phase 5 - Check Cyl groups\n");
 503         pass5();
 504         IOstats("Pass5");
 505
 506         /*
 507          * print out summary statistics
 508          */
 509         n_ffree = sblock.fs_cstotal.cs_nffree;
 510         n_bfree = sblock.fs_cstotal.cs_nbfree;
 511         files = maxino - UFS_ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 512         blks = n_blks +
 513             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 514         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 515         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 516         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 517         if (bkgrdflag && (files > 0 || blks > 0)) {
 518                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 519                 pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
 520                     countdirs, files - countdirs, blks);
 521         }
 522         pwarn("%ld files, %jd used, %ju free ",
 523             (long)n_files, (intmax_t)n_blks,
 524             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 525         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 526             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 527             n_ffree * 100.0 / sblock.fs_dsize);
 528         if (debug) {
 529                 if (files < 0)
 530                         printf("%jd inodes missing\n", -files);
 531                 if (blks < 0)
 532                         printf("%jd blocks missing\n", -blks);
 533                 if (duplist != NULL) {
 534                         printf("The following duplicate blocks remain:");
 535                         for (dp = duplist; dp; dp = dp->next)
 536                                 printf(" %jd,", (intmax_t)dp->dup);
 537                         printf("\n");
 538                 }
 539         }
 540         duplist = (struct dups *)0;
 541         muldup = (struct dups *)0;
 542         inocleanup();
 543         if (fsmodified) {
 544                 sblock.fs_time = time(NULL);
 545                 sbdirty();
 546         }
 547         if (cvtlevel && sblk.b_dirty) {
 548                 /*
 549                  * Write out the duplicate super blocks
 550                  */
 551                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 552                         blwrite(fswritefd, (char *)&sblock,
 553                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 554                             SBLOCKSIZE);
 555         }
 556         if (rerun)
 557                 resolved = 0;
 558         finalIOstats();
 559
 560         /*
 561          * Check to see if the file system is mounted read-write.
 562          */
 563         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 564                 resolved = 0;
 565         ckfini(resolved);
 566
 567         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 568                 if (inostathead[cylno].il_stat != NULL)
 569                         free((char *)inostathead[cylno].il_stat);
 570         free((char *)inostathead);
 571         inostathead = NULL;
 572         if (fsmodified && !preen)
 573                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 574         if (rerun) {
 575                 if (wantrestart && (restarts++ < 10) &&
 576                     (preen || reply("RESTART")))
 577                         return (ERESTART);
 578                 printf("\n***** PLEASE RERUN FSCK *****\n");
 579         }
 580         if (chkdoreload(mntp) != 0) {
 581                 if (!fsmodified)
 582                         return (0);
 583                 if (!preen)
 584                         printf("\n***** REBOOT NOW *****\n");
 585                 sync();
 586                 return (4);
 587         }
 588         return (0);
 589 }
 590
 591 static int
 592 chkdoreload(struct statfs *mntp)
 593 {
 594         struct iovec *iov;
 595         int iovlen;
 596         char errmsg[255];
 597
 598         if (mntp == NULL)
 599                 return (0);
 600
 601         iov = NULL;
 602         iovlen = 0;
 603         errmsg[0] = '\0';
 604         /*
 605          * We modified a mounted file system.  Do a mount update on
 606          * it unless it is read-write, so we can continue using it
 607          * as safely as possible.
 608          */
 609         if (mntp->f_flags & MNT_RDONLY) {
 610                 build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 611                 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
 612                     (size_t)-1);
 613                 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 614                     (size_t)-1);
 615                 build_iovec(&iov, &iovlen, "errmsg", errmsg,
 616                     sizeof(errmsg));
 617                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 618                 build_iovec(&iov, &iovlen, "reload", NULL, 0);
 619                 /*
 620                  * XX: We need the following line until we clean up
 621                  * nmount parsing of root mounts and NFS root mounts.
 622                  */
 623                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 624                 if (nmount(iov, iovlen, mntp->f_flags) == 0) {
 625                         return (0);
 626                 }
 627                 pwarn("mount reload of '%s' failed: %s %s\n\n",
 628                     mntp->f_mntonname, strerror(errno), errmsg);
 629                 return (1);
 630         }
 631         return (0);
 632 }
 633
 634 /*
 635  * Get the mount point information for name.
 636  */
 637 static struct statfs *
 638 getmntpt(const char *name)
 639 {
 640         struct stat devstat, mntdevstat;
 641         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 642         char *ddevname;
 643         struct statfs *mntbuf, *statfsp;
 644         int i, mntsize, isdev;
 645
 646         if (stat(name, &devstat) != 0)
 647                 return (NULL);
 648         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 649                 isdev = 1;
 650         else
 651                 isdev = 0;
 652         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 653         for (i = 0; i < mntsize; i++) {
 654                 statfsp = &mntbuf[i];
 655                 ddevname = statfsp->f_mntfromname;
 656                 if (*ddevname != '/') {
 657                         if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
 658                             sizeof(statfsp->f_mntfromname))
 659                                 continue;
 660                         strcpy(device, _PATH_DEV);
 661                         strcat(device, ddevname);
 662                         strcpy(statfsp->f_mntfromname, device);
 663                 }
 664                 if (isdev == 0) {
 665                         if (strcmp(name, statfsp->f_mntonname))
 666                                 continue;
 667                         return (statfsp);
 668                 }
 669                 if (stat(ddevname, &mntdevstat) == 0 &&
 670                     mntdevstat.st_rdev == devstat.st_rdev)
 671                         return (statfsp);
 672         }
 673         statfsp = NULL;
 674         return (statfsp);
 675 }
 676
 677 static void
 678 usage(void)
 679 {
 680         (void) fprintf(stderr,
 681 "usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n",
 682             getprogname());
 683         exit(1);
 684 }
 685
 686 void
 687 infohandler(int sig __unused)
 688 {
 689         got_siginfo = 1;
 690 }
 691
 692 void
 693 alarmhandler(int sig __unused)
 694 {
 695         got_sigalarm = 1;
 696 }