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