sbin/hammer/hammer.c

   1 /*
   2  * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sbin/hammer/hammer.c,v 1.44 2008/11/13 02:04:27 dillon Exp $
  35  */
  36
  37 #include "hammer.h"
  38 #include <signal.h>
  39 #include <math.h>
  40 #include <fstab.h>
  41
  42 static void hammer_parsedevs(const char *blkdevs);
  43 static void sigalrm(int signo);
  44 static void sigintr(int signo);
  45 static void usage(int exit_code);
  46
  47 int RecurseOpt;
  48 int VerboseOpt;
  49 int QuietOpt;
  50 int NoSyncOpt;
  51 int TwoWayPipeOpt;
  52 int TimeoutOpt;
  53 int DelayOpt = 5;
  54 char *SshPort;
  55 int ForceYesOpt = 0;
  56 int CompressOpt;
  57 int ForceOpt;
  58 int RunningIoctl;
  59 int DidInterrupt;
  60 int BulkOpt;
  61 u_int64_t BandwidthOpt;
  62 u_int64_t SplitupOpt = 4ULL * 1024ULL * 1024ULL * 1024ULL;
  63 const char *CyclePath;
  64 const char *LinkPath;
  65
  66 int
  67 main(int ac, char **av)
  68 {
  69         char *blkdevs = NULL;
  70         char *ptr;
  71         u_int32_t status;
  72         int ch;
  73         int cacheSize = 0;
  74
  75         while ((ch = getopt(ac, av, "b:c:dhf:i:p:qrs:t:v2yBC:FS:X")) != -1) {
  76                 switch(ch) {
  77                 case '2':
  78                         TwoWayPipeOpt = 1;
  79                         break;
  80                 case 'y':
  81                         ForceYesOpt = 1;
  82                         break;
  83                 case 'b':
  84                         BandwidthOpt = strtoull(optarg, &ptr, 0);
  85                         switch(*ptr) {
  86                         case 'g':
  87                         case 'G':
  88                                 BandwidthOpt *= 1024;
  89                                 /* fall through */
  90                         case 'm':
  91                         case 'M':
  92                                 BandwidthOpt *= 1024;
  93                                 /* fall through */
  94                         case 'k':
  95                         case 'K':
  96                                 BandwidthOpt *= 1024;
  97                                 break;
  98                         case '\0':
  99                                 /* bytes per second if no suffix */
 100                                 break;
 101                         default:
 102                                 usage(1);
 103                         }
 104                         break;
 105                 case 'S':
 106                         SplitupOpt = strtoull(optarg, &ptr, 0);
 107                         switch(*ptr) {
 108                         case 'g':
 109                         case 'G':
 110                                 SplitupOpt *= 1024;
 111                                 /* fall through */
 112                         case 'm':
 113                         case 'M':
 114                                 SplitupOpt *= 1024;
 115                                 /* fall through */
 116                         case 'k':
 117                         case 'K':
 118                                 SplitupOpt *= 1024;
 119                                 break;
 120                         case '\0':
 121                                 /* bytes per second if no suffix */
 122                                 break;
 123                         default:
 124                                 usage(1);
 125                         }
 126                         break;
 127                 case 'c':
 128                         CyclePath = optarg;
 129                         break;
 130                 case 'd':
 131                         ++DebugOpt;
 132                         break;
 133                 case 'h':
 134                         usage(0);
 135                         /* not reached */
 136                 case 'i':
 137                         DelayOpt = strtol(optarg, NULL, 0);
 138                         break;
 139                 case 'p':
 140                         SshPort = optarg;
 141                         break;
 142                 case 'r':
 143                         RecurseOpt = 1;
 144                         break;
 145                 case 'f':
 146                         blkdevs = optarg;
 147                         break;
 148                 case 's':
 149                         LinkPath = optarg;
 150                         break;
 151                 case 't':
 152                         TimeoutOpt = strtol(optarg, NULL, 0);
 153                         break;
 154                 case 'v':
 155                         if (QuietOpt > 0)
 156                                 --QuietOpt;
 157                         else
 158                                 ++VerboseOpt;
 159                         break;
 160                 case 'q':
 161                         if (VerboseOpt > 0)
 162                                 --VerboseOpt;
 163                         else
 164                                 ++QuietOpt;
 165                         break;
 166                 case 'B':
 167                         BulkOpt = 1;
 168                         break;
 169                 case 'C':
 170                         cacheSize = strtol(optarg, &ptr, 0);
 171                         switch(*ptr) {
 172                         case 'm':
 173                         case 'M':
 174                                 cacheSize *= 1024;
 175                                 /* fall through */
 176                         case 'k':
 177                         case 'K':
 178                                 cacheSize *= 1024;
 179                                 ++ptr;
 180                                 break;
 181                         case '\0':
 182                         case ':':
 183                                 /* bytes if no suffix */
 184                                 break;
 185                         default:
 186                                 usage(1);
 187                         }
 188                         if (*ptr == ':') {
 189                                 UseReadAhead = strtol(ptr + 1, NULL, 0);
 190                                 UseReadBehind = -UseReadAhead;
 191                         }
 192                         if (cacheSize < 1024 * 1024)
 193                                 cacheSize = 1024 * 1024;
 194                         if (UseReadAhead < 0)
 195                                 usage(1);
 196                         if (UseReadAhead * HAMMER_BUFSIZE / cacheSize / 16) {
 197                                 UseReadAhead = cacheSize / 16 / HAMMER_BUFSIZE;
 198                                 UseReadBehind = -UseReadAhead;
 199                         }
 200                         hammer_cache_set(cacheSize);
 201                         break;
 202                 case 'F':
 203                         ForceOpt = 1;
 204                         break;
 205                 case 'X':
 206                         CompressOpt = 1;
 207                         break;
 208                 default:
 209                         usage(1);
 210                         /* not reached */
 211                 }
 212         }
 213         ac -= optind;
 214         av += optind;
 215         if (ac < 1) {
 216                 usage(1);
 217                 /* not reached */
 218         }
 219
 220         signal(SIGALRM, sigalrm);
 221         signal(SIGINT, sigintr);
 222
 223         if (strcmp(av[0], "synctid") == 0) {
 224                 hammer_cmd_synctid(av + 1, ac - 1);
 225                 exit(0);
 226         }
 227         if (strcmp(av[0], "namekey2") == 0) {
 228                 int64_t key;
 229                 int32_t crcx;
 230                 int len;
 231                 const char *aname = av[1];
 232
 233                 if (aname == NULL)
 234                         usage(1);
 235                 len = strlen(aname);
 236                 key = (u_int32_t)crc32(aname, len) & 0xFFFFFFFEU;
 237
 238                 switch(len) {
 239                 default:
 240                         crcx = crc32(aname + 3, len - 5);
 241                         crcx = crcx ^ (crcx >> 6) ^ (crcx >> 12);
 242                         key |= (int64_t)(crcx & 0x3F) << 42;
 243                         /* fall through */
 244                 case 5:
 245                 case 4:
 246                         /* fall through */
 247                 case 3:
 248                         key |= ((int64_t)(aname[2] & 0x1F) << 48);
 249                         /* fall through */
 250                 case 2:
 251                         key |= ((int64_t)(aname[1] & 0x1F) << 53) |
 252                                ((int64_t)(aname[len-2] & 0x1F) << 37);
 253                         /* fall through */
 254                 case 1:
 255                         key |= ((int64_t)(aname[0] & 0x1F) << 58) |
 256                                ((int64_t)(aname[len-1] & 0x1F) << 32);
 257                         /* fall through */
 258                 case 0:
 259                         break;
 260                 }
 261                 if (key == 0)
 262                         key |= 0x100000000LL;
 263                 printf("0x%016jx\n", (uintmax_t)key);
 264                 exit(0);
 265         }
 266         if (strcmp(av[0], "namekey1") == 0) {
 267                 int64_t key;
 268
 269                 if (av[1] == NULL)
 270                         usage(1);
 271                 key = (int64_t)(crc32(av[1], strlen(av[1])) & 0x7FFFFFFF) << 32;
 272                 if (key == 0)
 273                         key |= 0x100000000LL;
 274                 printf("0x%016jx\n", (uintmax_t)key);
 275                 exit(0);
 276         }
 277         if (strcmp(av[0], "namekey32") == 0) {
 278                 int32_t key;
 279
 280                 if (av[1] == NULL)
 281                         usage(1);
 282                 key = crc32(av[1], strlen(av[1])) & 0x7FFFFFFF;
 283                 if (key == 0)
 284                         ++key;
 285                 printf("0x%08x\n", key);
 286                 exit(0);
 287         }
 288         if (strcmp(av[0], "pfs-status") == 0) {
 289                 hammer_cmd_pseudofs_status(av + 1, ac - 1);
 290                 exit(0);
 291         }
 292         if (strcmp(av[0], "pfs-master") == 0) {
 293                 hammer_cmd_pseudofs_create(av + 1, ac - 1, 0);
 294                 exit(0);
 295         }
 296         if (strcmp(av[0], "pfs-slave") == 0) {
 297                 hammer_cmd_pseudofs_create(av + 1, ac - 1, 1);
 298                 exit(0);
 299         }
 300         if (strcmp(av[0], "pfs-update") == 0) {
 301                 hammer_cmd_pseudofs_update(av + 1, ac - 1);
 302                 exit(0);
 303         }
 304         if (strcmp(av[0], "pfs-upgrade") == 0) {
 305                 hammer_cmd_pseudofs_upgrade(av + 1, ac - 1);
 306                 exit(0);
 307         }
 308         if (strcmp(av[0], "pfs-downgrade") == 0) {
 309                 hammer_cmd_pseudofs_downgrade(av + 1, ac - 1);
 310                 exit(0);
 311         }
 312         if (strcmp(av[0], "pfs-destroy") == 0) {
 313                 hammer_cmd_pseudofs_destroy(av + 1, ac - 1);
 314                 exit(0);
 315         }
 316         if (strcmp(av[0], "status") == 0) {
 317                 hammer_cmd_status(av + 1, ac - 1);
 318                 exit(0);
 319         }
 320         if (strcmp(av[0], "prune") == 0) {
 321                 hammer_cmd_softprune(av + 1, ac - 1, 0);
 322                 exit(0);
 323         }
 324         if (strcmp(av[0], "config") == 0) {
 325                 hammer_cmd_config(av + 1, ac - 1);
 326                 exit(0);
 327         }
 328         if (strcmp(av[0], "viconfig") == 0) {
 329                 hammer_cmd_viconfig(av + 1, ac - 1);
 330                 exit(0);
 331         }
 332         if (strcmp(av[0], "cleanup") == 0) {
 333                 hammer_cmd_cleanup(av + 1, ac - 1);
 334                 exit(0);
 335         }
 336         if (strcmp(av[0], "info") == 0) {
 337                 hammer_cmd_info();
 338                 exit(0);
 339         }
 340         if (strcmp(av[0], "prune-everything") == 0) {
 341                 hammer_cmd_softprune(av + 1, ac - 1, 1);
 342                 exit(0);
 343         }
 344         if (strcmp(av[0], "snap") == 0) {
 345                 hammer_cmd_snap(av + 1, ac - 1, 0, 1);
 346                 exit(0);
 347         }
 348         if (strcmp(av[0], "snaplo") == 0) {
 349                 hammer_cmd_snap(av + 1, ac - 1, 0, 0);
 350                 exit(0);
 351         }
 352         if (strcmp(av[0], "snapq") == 0) {
 353                 hammer_cmd_snap(av + 1, ac - 1, 1, 0);
 354                 exit(0);
 355         }
 356         if (strcmp(av[0], "snapls") == 0) {
 357                 hammer_cmd_snapls(av + 1, ac - 1);
 358                 exit(0);
 359         }
 360         if (strcmp(av[0], "snaprm") == 0) {
 361                 hammer_cmd_snaprm(av + 1, ac - 1);
 362                 exit(0);
 363         }
 364         if (strcmp(av[0], "snapshot") == 0) {
 365                 hammer_cmd_snapshot(av + 1, ac - 1);
 366                 exit(0);
 367         }
 368         if (strcmp(av[0], "bstats") == 0) {
 369                 hammer_cmd_bstats(av + 1, ac - 1);
 370                 exit(0);
 371         }
 372         if (strcmp(av[0], "iostats") == 0) {
 373                 hammer_cmd_iostats(av + 1, ac - 1);
 374                 exit(0);
 375         }
 376
 377         if (strncmp(av[0], "history", 7) == 0) {
 378                 hammer_cmd_history(av[0] + 7, av + 1, ac - 1);
 379                 exit(0);
 380         }
 381         if (strcmp(av[0], "rebalance") == 0) {
 382                 signal(SIGINT, sigalrm);
 383                 hammer_cmd_rebalance(av + 1, ac - 1);
 384                 exit(0);
 385         }
 386         if (strncmp(av[0], "reblock", 7) == 0) {
 387                 signal(SIGINT, sigalrm);
 388                 if (strcmp(av[0], "reblock") == 0)
 389                         hammer_cmd_reblock(av + 1, ac - 1, -1);
 390                 else if (strcmp(av[0], "reblock-btree") == 0)
 391                         hammer_cmd_reblock(av + 1, ac - 1, HAMMER_IOC_DO_BTREE);
 392                 else if (strcmp(av[0], "reblock-inodes") == 0)
 393                         hammer_cmd_reblock(av + 1, ac - 1, HAMMER_IOC_DO_INODES);
 394                 else if (strcmp(av[0], "reblock-dirs") == 0)
 395                         hammer_cmd_reblock(av + 1, ac - 1, HAMMER_IOC_DO_DIRS);
 396                 else if (strcmp(av[0], "reblock-data") == 0)
 397                         hammer_cmd_reblock(av + 1, ac - 1, HAMMER_IOC_DO_DATA);
 398                 else
 399                         usage(1);
 400                 exit(0);
 401         }
 402         if (strncmp(av[0], "mirror", 6) == 0) {
 403                 if (strcmp(av[0], "mirror-read") == 0)
 404                         hammer_cmd_mirror_read(av + 1, ac - 1, 0);
 405                 else if (strcmp(av[0], "mirror-read-stream") == 0)
 406                         hammer_cmd_mirror_read(av + 1, ac - 1, 1);
 407                 else if (strcmp(av[0], "mirror-write") == 0)
 408                         hammer_cmd_mirror_write(av + 1, ac - 1);
 409                 else if (strcmp(av[0], "mirror-copy") == 0)
 410                         hammer_cmd_mirror_copy(av + 1, ac - 1, 0);
 411                 else if (strcmp(av[0], "mirror-stream") == 0)
 412                         hammer_cmd_mirror_copy(av + 1, ac - 1, 1);
 413                 else if (strcmp(av[0], "mirror-dump") == 0)
 414                         hammer_cmd_mirror_dump();
 415                 else
 416                         usage(1);
 417                 exit(0);
 418         }
 419         if (strcmp(av[0], "dedup-simulate") == 0) {
 420                 hammer_cmd_dedup_simulate(av + 1, ac - 1);
 421                 exit(0);
 422         }
 423         if (strcmp(av[0], "dedup") == 0) {
 424                 hammer_cmd_dedup(av + 1, ac - 1);
 425                 exit(0);
 426         }
 427         if (strcmp(av[0], "version") == 0) {
 428                 hammer_cmd_get_version(av + 1, ac - 1);
 429                 exit(0);
 430         }
 431         if (strcmp(av[0], "version-upgrade") == 0) {
 432                 hammer_cmd_set_version(av + 1, ac - 1);
 433                 exit(0);
 434         }
 435         if (strcmp(av[0], "volume-add") == 0) {
 436                 hammer_cmd_volume_add(av + 1, ac - 1);
 437                 exit(0);
 438         }
 439         if (strcmp(av[0], "volume-del") == 0) {
 440                 hammer_cmd_volume_del(av + 1, ac - 1);
 441                 exit(0);
 442         }
 443         if (strcmp(av[0], "volume-list") == 0) {
 444                 hammer_cmd_volume_list(av + 1, ac - 1);
 445                 exit(0);
 446         }
 447
 448         uuid_name_lookup(&Hammer_FSType, "DragonFly HAMMER", &status);
 449         if (status != uuid_s_ok) {
 450                 errx(1, "uuids file does not have the DragonFly "
 451                         "HAMMER filesystem type");
 452         }
 453
 454         if (strcmp(av[0], "show") == 0) {
 455                 u_int32_t lo = 0;
 456                 intmax_t obj_id = (int64_t)HAMMER_MIN_OBJID;
 457
 458                 hammer_parsedevs(blkdevs);
 459                 if (ac > 1)
 460                         sscanf(av[1], "%08x:%jx", &lo, &obj_id);
 461                 hammer_cmd_show(-1, lo, (int64_t)obj_id, 0, NULL, NULL);
 462                 exit(0);
 463         }
 464         if (strcmp(av[0], "show-undo") == 0) {
 465                 hammer_parsedevs(blkdevs);
 466                 hammer_cmd_show_undo();
 467                 exit(0);
 468         }
 469         if (strcmp(av[0], "recover") == 0) {
 470                 hammer_parsedevs(blkdevs);
 471                 if (ac <= 1)
 472                         errx(1, "hammer recover required target directory");
 473                 hammer_cmd_recover(av[1]);
 474                 exit(0);
 475         }
 476         if (strcmp(av[0], "blockmap") == 0) {
 477                 hammer_parsedevs(blkdevs);
 478                 hammer_cmd_blockmap();
 479                 exit(0);
 480         }
 481         if (strcmp(av[0], "checkmap") == 0) {
 482                 hammer_parsedevs(blkdevs);
 483                 hammer_cmd_checkmap();
 484                 exit(0);
 485         }
 486         usage(1);
 487         /* not reached */
 488         return(0);
 489 }
 490
 491 /*
 492  * Parse the device specification.
 493  *
 494  * Multi-volume hammer devices are colon-separated.  Each element
 495  * may be further expanded via /etc/devtab.  One may also specify
 496  * a single element which is expanded into multiple elements via
 497  * /etc/devtab.
 498  */
 499 static
 500 void
 501 hammer_parsedevs(const char *blkdevs)
 502 {
 503         char *copy;
 504         char *volname;
 505
 506         if (blkdevs == NULL) {
 507                 errx(1, "A -f blkdevs specification is required "
 508                         "for this command");
 509         }
 510
 511         copy = strdup(blkdevs);
 512         while ((volname = copy) != NULL) {
 513                 if ((copy = strchr(copy, ':')) != NULL)
 514                         *copy++ = 0;
 515                 volname = getdevpath(volname, 0);
 516                 if (strchr(volname, ':'))
 517                         hammer_parsedevs(volname);
 518                 else
 519                         setup_volume(-1, volname, 0, O_RDONLY);
 520         }
 521 }
 522
 523 static
 524 void
 525 sigalrm(int signo __unused)
 526 {
 527         /* do nothing (interrupts HAMMER ioctl) */
 528 }
 529
 530 static
 531 void
 532 sigintr(int signo __unused)
 533 {
 534         if (RunningIoctl == 0)
 535                 _exit(1);
 536         DidInterrupt = 1;
 537         /* do nothing (interrupts HAMMER ioctl) */
 538 }
 539
 540 static
 541 void
 542 usage(int exit_code)
 543 {
 544         fprintf(stderr,
 545                 "hammer -h\n"
 546                 "hammer [-2BqrvXy] [-b bandwidth] [-C cachesize[:readahead]] [-c cyclefile]\n"
 547                 "       [-f blkdevs] [-i delay] [-t seconds] [-S splitup]\n"
 548                 "       command [argument ...]\n"
 549                 "hammer synctid <filesystem> [quick]\n"
 550                 "hammer bstats [interval]\n"
 551                 "hammer iostats [interval]\n"
 552                 "hammer history[@offset[,len]] <file> ...\n"
 553                 "hammer namekey1 <path>\n"
 554                 "hammer namekey2 <path>\n"
 555                 "hammer namekey32 <path>\n"
 556                 "hammer cleanup [<filesystem> ...]\n"
 557                 "hammer info\n"
 558                 "hammer snapshot [<filesystem>] <snapshot-dir>\n"
 559                 "hammer snapshot <filesystem> <snapshot-dir> [<note>]\n"
 560                 "hammer prune <softlink-dir>\n"
 561                 "hammer prune-everything <filesystem>\n"
 562                 "hammer rebalance <filesystem> [saturation_percentage]\n"
 563                 "hammer reblock[-btree|-inodes|-dirs|-data] "
 564                         "<filesystem> [fill_percentage]\n"
 565                 "hammer pfs-status <dirpath> ...\n"
 566                 "hammer pfs-master <dirpath> [options]\n"
 567                 "hammer pfs-slave <dirpath> [options]\n"
 568                 "hammer pfs-update <dirpath> [options]\n"
 569                 "hammer pfs-upgrade <dirpath>\n"
 570                 "hammer pfs-downgrade <dirpath>\n"
 571                 "hammer pfs-destroy <dirpath>\n"
 572                 "hammer mirror-read <filesystem> [begin-tid]\n"
 573                 "hammer mirror-read-stream <filesystem> [begin-tid]\n"
 574                 "hammer mirror-write <filesystem>\n"
 575                 "hammer mirror-dump\n"
 576                 "hammer mirror-copy [[user@]host:]<filesystem>"
 577                                   " [[user@]host:]<filesystem>\n"
 578                 "hammer mirror-stream [[user@]host:]<filesystem>"
 579                                     " [[user@]host:]<filesystem>\n"
 580                 "hammer version <filesystem>\n"
 581                 "hammer version-upgrade <filesystem> <version> [force]\n"
 582                 "hammer volume-add <device> <filesystem>\n"
 583                 "hammer volume-del <device> <filesystem>\n"
 584                 "hammer volume-list <filesystem>\n"
 585         );
 586
 587         fprintf(stderr, "\nHAMMER utility version 3+ commands:\n");
 588
 589         fprintf(stderr,
 590                 "hammer config [<filesystem> [<configfile>]]\n"
 591                 "hammer viconfig [<filesystem>]\n"
 592                 "hammer snap <path> [<note>]\n"
 593                 "hammer snaplo <path> [<note>]\n"
 594                 "hammer snapq <dir> [<note>]\n"
 595                 "hammer snaprm <path> ...\n"
 596                 "hammer snaprm <transid> ...\n"
 597                 "hammer snaprm <filesystem> <transid> ...\n"
 598                 "hammer snapls [<path> ...]\n"
 599         );
 600
 601         fprintf(stderr, "\nHAMMER utility version 4+ commands:\n");
 602
 603         fprintf(stderr,
 604                 "hammer -f blkdevs blockmap\n"
 605                 "hammer -f blkdevs checkmap\n"
 606                 "hammer -f blkdevs [-qqq] show [lo:objid]\n"
 607                 "hammer -f blkdevs show-undo\n"
 608                 "hammer -f blkdevs recover <target_dir>\n"
 609         );
 610
 611         fprintf(stderr, "\nHAMMER utility version 5+ commands:\n");
 612
 613         fprintf(stderr,
 614                 "hammer dedup-simulate <filesystem>\n"
 615                 "hammer dedup <filesystem>\n"
 616         );
 617
 618         exit(exit_code);
 619 }
 620