sbin/hammer/cmd_cleanup.c

   1 /*
   2  * Copyright (c) 2008 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/cmd_cleanup.c,v 1.6 2008/10/07 22:28:41 thomas Exp $
  35  */
  36 /*
  37  * Clean up a specific HAMMER filesystem or all HAMMER filesystems.
  38  *
  39  * Each filesystem is expected to have a <mount>/snapshots directory.
  40  * No cleanup will be performed on any filesystem that does not.  If
  41  * no filesystems are specified the 'df' program is run and any HAMMER
  42  * or null-mounted hammer PFS's are extracted.
  43  *
  44  * The snapshots directory may contain a config file called 'config'.  If
  45  * no config file is present one will be created with the following
  46  * defaults:
  47  *
  48  *      snapshots 1d 60d        (0d 0d for /tmp, /var/tmp, /usr/obj)
  49  *      prune     1d 5m
  50  *      reblock   1d 5m
  51  *      recopy    30d 5m
  52  *
  53  * All hammer commands create and maintain cycle files in the snapshots
  54  * directory.
  55  */
  56
  57 #include "hammer.h"
  58
  59 struct didpfs {
  60         struct didpfs *next;
  61         uuid_t          uuid;
  62 };
  63
  64 static void do_cleanup(const char *path);
  65 static int strtosecs(char *ptr);
  66 static const char *dividing_slash(const char *path);
  67 static int check_period(const char *snapshots_path, const char *cmd, int arg1,
  68                         time_t *savep);
  69 static void save_period(const char *snapshots_path, const char *cmd,
  70                         time_t savet);
  71 static int check_softlinks(const char *snapshots_path);
  72 static void cleanup_softlinks(const char *path, const char *snapshots_path,
  73                         int arg2, char *arg3);
  74 static int check_expired(const char *fpath, int arg2);
  75
  76 static int create_snapshot(const char *path, const char *snapshots_path,
  77                               int arg1, int arg2);
  78 static int cleanup_prune(const char *path, const char *snapshots_path,
  79                               int arg1, int arg2, int snapshots_disabled);
  80 static int cleanup_reblock(const char *path, const char *snapshots_path,
  81                               int arg1, int arg2);
  82 static int cleanup_recopy(const char *path, const char *snapshots_path,
  83                               int arg1, int arg2);
  84
  85 static void runcmd(int *resp, const char *ctl, ...);
  86
  87 #define WS      " \t\r\n"
  88
  89 struct didpfs *FirstPFS;
  90
  91 void
  92 hammer_cmd_cleanup(char **av, int ac)
  93 {
  94         char *fstype, *fs, *path;
  95         struct statfs *stfsbuf;
  96         int mntsize, i;
  97
  98         tzset();
  99         if (ac == 0) {
 100                 mntsize = getmntinfo(&stfsbuf, MNT_NOWAIT);
 101                 if (mntsize > 0) {
 102                         for (i=0; i < mntsize; i++) {
 103                                 /*
 104                                  * We will cleanup in the case fstype is hammer.
 105                                  * If we have null-mounted PFS, we check the
 106                                  * mount source. If it looks like a PFS, we
 107                                  * proceed to cleanup also.
 108                                  */
 109                                 fstype = stfsbuf[i].f_fstypename;
 110                                 fs = stfsbuf[i].f_mntfromname;
 111                                 if ((strcmp(fstype, "hammer") == 0) ||
 112                                     ((strcmp(fstype, "null") == 0) &&
 113                                      (strstr(fs, "/@@0x") != NULL ||
 114                                       strstr(fs, "/@@-1") != NULL))) {
 115                                         path = stfsbuf[i].f_mntonname;
 116                                         do_cleanup(path);
 117                                 }
 118                         }
 119                 }
 120
 121         } else {
 122                 while (ac) {
 123                         do_cleanup(*av);
 124                         --ac;
 125                         ++av;
 126                 }
 127         }
 128 }
 129
 130 static
 131 void
 132 do_cleanup(const char *path)
 133 {
 134         struct hammer_ioc_pseudofs_rw pfs;
 135         union hammer_ioc_mrecord_any mrec_tmp;
 136         char *snapshots_path;
 137         char *config_path;
 138         struct stat st;
 139         char *cmd;
 140         char *ptr;
 141         int arg1;
 142         int arg2;
 143         char *arg3;
 144         time_t savet;
 145         char buf[256];
 146         FILE *fp;
 147         struct didpfs *didpfs;
 148         int snapshots_disabled = 0;
 149         int prune_warning = 0;
 150         int fd;
 151         int r;
 152
 153         bzero(&pfs, sizeof(pfs));
 154         bzero(&mrec_tmp, sizeof(mrec_tmp));
 155         pfs.ondisk = &mrec_tmp.pfs.pfsd;
 156         pfs.bytes = sizeof(mrec_tmp.pfs.pfsd);
 157         pfs.pfs_id = -1;
 158
 159         printf("cleanup %-20s -", path);
 160         fd = open(path, O_RDONLY);
 161         if (fd < 0) {
 162                 printf(" unable to access directory: %s\n", strerror(errno));
 163                 return;
 164         }
 165         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
 166                 printf(" not a HAMMER filesystem: %s\n", strerror(errno));
 167                 return;
 168         }
 169         close(fd);
 170         if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION) {
 171                 printf(" unrecognized HAMMER version\n");
 172                 return;
 173         }
 174
 175         /*
 176          * Make sure we have not already handled this PFS.  Several nullfs
 177          * mounts might alias the same PFS.
 178          */
 179         for (didpfs = FirstPFS; didpfs; didpfs = didpfs->next) {
 180                 if (bcmp(&didpfs->uuid, &mrec_tmp.pfs.pfsd.unique_uuid, sizeof(uuid_t)) == 0) {
 181                         printf(" PFS #%d already handled\n", pfs.pfs_id);
 182                         return;
 183                 }
 184         }
 185         didpfs = malloc(sizeof(*didpfs));
 186         didpfs->next = FirstPFS;
 187         FirstPFS = didpfs;
 188         didpfs->uuid = mrec_tmp.pfs.pfsd.unique_uuid;
 189
 190         /*
 191          * Figure out where the snapshot directory is.
 192          */
 193         if (mrec_tmp.pfs.pfsd.snapshots[0] == '/') {
 194                 asprintf(&snapshots_path, "%s", mrec_tmp.pfs.pfsd.snapshots);
 195         } else if (mrec_tmp.pfs.pfsd.snapshots[0]) {
 196                 printf(" WARNING: pfs-slave's snapshots dir is not absolute\n");
 197                 return;
 198         } else if (mrec_tmp.pfs.pfsd.mirror_flags & HAMMER_PFSD_SLAVE) {
 199                 printf(" WARNING: must configure snapshot dir for PFS slave\n");
 200                 printf("\tWe suggest <fs>/var/slaves/<name> where "
 201                        "<fs> is the base HAMMER fs\n");
 202                 printf("\tcontaining the slave\n");
 203                 return;
 204         } else {
 205                 asprintf(&snapshots_path,
 206                          "%s%ssnapshots", path, dividing_slash(path));
 207         }
 208
 209         /*
 210          * Create a snapshot directory if necessary, and a config file if
 211          * necessary.
 212          */
 213         if (stat(snapshots_path, &st) < 0) {
 214                 if (mkdir(snapshots_path, 0755) != 0) {
 215                         free(snapshots_path);
 216                         printf(" unable to create snapshot dir \"%s\": %s\n",
 217                                 snapshots_path, strerror(errno));
 218                         return;
 219                 }
 220         }
 221         asprintf(&config_path, "%s/config", snapshots_path);
 222         if ((fp = fopen(config_path, "r")) == NULL) {
 223                 fp = fopen(config_path, "w");
 224                 if (fp == NULL) {
 225                         printf(" cannot create %s: %s\n",
 226                                 config_path, strerror(errno));
 227                         return;
 228                 }
 229                 if (strcmp(path, "/tmp") == 0 ||
 230                     strcmp(path, "/var/tmp") == 0 ||
 231                     strcmp(path, "/usr/obj") == 0) {
 232                         fprintf(fp, "snapshots 0d 0d\n");
 233                 } else {
 234                         fprintf(fp, "snapshots 1d 60d\n");
 235                 }
 236                 fprintf(fp,
 237                         "prune     1d 5m\n"
 238                         "reblock   1d 5m\n"
 239                         "recopy    30d 10m\n");
 240                 fclose(fp);
 241                 fp = fopen(config_path, "r");
 242         }
 243         if (fp == NULL) {
 244                 printf(" cannot access %s: %s\n",
 245                        config_path, strerror(errno));
 246                 return;
 247         }
 248
 249         if (flock(fileno(fp), LOCK_EX|LOCK_NB) == -1) {
 250                 if (errno == EWOULDBLOCK)
 251                         printf(" PFS #%d locked by other process\n", pfs.pfs_id);
 252                 else
 253                         printf(" can not lock %s: %s\n", config_path, strerror(errno));
 254                 fclose(fp);
 255                 return;
 256         }
 257
 258         printf(" handle PFS #%d using %s\n", pfs.pfs_id, snapshots_path);
 259
 260         /*
 261          * Process the config file
 262          */
 263         while (fgets(buf, sizeof(buf), fp) != NULL) {
 264                 cmd = strtok(buf, WS);
 265                 arg1 = 0;
 266                 arg2 = 0;
 267                 arg3 = NULL;
 268                 if ((ptr = strtok(NULL, WS)) != NULL) {
 269                         arg1 = strtosecs(ptr);
 270                         if ((ptr = strtok(NULL, WS)) != NULL) {
 271                                 arg2 = strtosecs(ptr);
 272                                 arg3 = strtok(NULL, WS);
 273                         }
 274                 }
 275
 276                 printf("%20s - ", cmd);
 277                 fflush(stdout);
 278
 279                 r = 1;
 280                 if (strcmp(cmd, "snapshots") == 0) {
 281                         if (arg1 == 0) {
 282                                 if (arg2 && check_softlinks(snapshots_path)) {
 283                                         printf("only removing old snapshots\n");
 284                                         prune_warning = 1;
 285                                         cleanup_softlinks(path, snapshots_path,
 286                                                           arg2, arg3);
 287                                 } else {
 288                                         printf("disabled\n");
 289                                         snapshots_disabled = 1;
 290                                 }
 291                         } else
 292                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 293                                 printf("run\n");
 294                                 cleanup_softlinks(path, snapshots_path,
 295                                                   arg2, arg3);
 296                                 r = create_snapshot(path, snapshots_path,
 297                                                   arg1, arg2);
 298                         } else {
 299                                 printf("skip\n");
 300                         }
 301                 } else if (arg1 == 0) {
 302                         /*
 303                          * The commands following this check can't handle
 304                          * a period of 0, so call the feature disabled and
 305                          * ignore the directive.
 306                          */
 307                         printf("disabled\n");
 308                 } else if (strcmp(cmd, "prune") == 0) {
 309                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 310                                 if (prune_warning) {
 311                                         printf("run - WARNING snapshot "
 312                                                "softlinks present "
 313                                                "but snapshots disabled\n");
 314                                 } else {
 315                                         printf("run\n");
 316                                 }
 317                                 r = cleanup_prune(path, snapshots_path,
 318                                               arg1, arg2, snapshots_disabled);
 319                         } else {
 320                                 printf("skip\n");
 321                         }
 322                 } else if (strcmp(cmd, "reblock") == 0) {
 323                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 324                                 printf("run");
 325                                 fflush(stdout);
 326                                 if (VerboseOpt)
 327                                         printf("\n");
 328                                 r = cleanup_reblock(path, snapshots_path,
 329                                                 arg1, arg2);
 330                         } else {
 331                                 printf("skip\n");
 332                         }
 333                 } else if (strcmp(cmd, "recopy") == 0) {
 334                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 335                                 printf("run");
 336                                 fflush(stdout);
 337                                 if (VerboseOpt)
 338                                         printf("\n");
 339                                 r = cleanup_recopy(path, snapshots_path,
 340                                                arg1, arg2);
 341                         } else {
 342                                 printf("skip\n");
 343                         }
 344                 } else {
 345                         printf("unknown directive\n");
 346                         r = 1;
 347                 }
 348                 if (r == 0)
 349                         save_period(snapshots_path, cmd, savet);
 350         }
 351         fclose(fp);
 352         usleep(1000);
 353 }
 354
 355 static
 356 int
 357 strtosecs(char *ptr)
 358 {
 359         int val;
 360
 361         val = strtol(ptr, &ptr, 0);
 362         switch(*ptr) {
 363         case 'd':
 364                 val *= 24;
 365                 /* fall through */
 366         case 'h':
 367                 val *= 60;
 368                 /* fall through */
 369         case 'm':
 370                 val *= 60;
 371                 /* fall through */
 372         case 's':
 373                 break;
 374         default:
 375                 errx(1, "illegal suffix converting %s\n", ptr);
 376                 break;
 377         }
 378         return(val);
 379 }
 380
 381 static const char *
 382 dividing_slash(const char *path)
 383 {
 384         int len = strlen(path);
 385         if (len && path[len-1] == '/')
 386                 return("");
 387         else
 388                 return("/");
 389 }
 390
 391 /*
 392  * Check whether the desired period has elapsed since the last successful
 393  * run.  The run may take a while and cross a boundary so we remember the
 394  * current time_t so we can save it later on.
 395  *
 396  * Periods in minutes, hours, or days are assumed to have been crossed
 397  * if the local time crosses a minute, hour, or day boundary regardless
 398  * of how close the last operation actually was.
 399  */
 400 static int
 401 check_period(const char *snapshots_path, const char *cmd, int arg1,
 402         time_t *savep)
 403 {
 404         char *check_path;
 405         struct tm tp1;
 406         struct tm tp2;
 407         FILE *fp;
 408         time_t baset, lastt;
 409         char buf[256];
 410
 411         time(savep);
 412         localtime_r(savep, &tp1);
 413
 414         /*
 415          * Retrieve the start time of the last successful operation.
 416          */
 417         asprintf(&check_path, "%s/.%s.period", snapshots_path, cmd);
 418         fp = fopen(check_path, "r");
 419         free(check_path);
 420         if (fp == NULL)
 421                 return(1);
 422         if (fgets(buf, sizeof(buf), fp) == NULL) {
 423                 fclose(fp);
 424                 return(1);
 425         }
 426         fclose(fp);
 427
 428         lastt = strtol(buf, NULL, 0);
 429         localtime_r(&lastt, &tp2);
 430
 431         /*
 432          * Normalize the times.  e.g. if asked to do something on a 1-day
 433          * interval the operation will be performed as soon as the day
 434          * turns over relative to the previous operation, even if the previous
 435          * operation ran a few seconds ago just before midnight.
 436          */
 437         if (arg1 % 60 == 0) {
 438                 tp1.tm_sec = 0;
 439                 tp2.tm_sec = 0;
 440         }
 441         if (arg1 % (60 * 60) == 0) {
 442                 tp1.tm_min = 0;
 443                 tp2.tm_min = 0;
 444         }
 445         if (arg1 % (24 * 60 * 60) == 0) {
 446                 tp1.tm_hour = 0;
 447                 tp2.tm_hour = 0;
 448         }
 449
 450         baset = mktime(&tp1);
 451         lastt = mktime(&tp2);
 452
 453 #if 0
 454         printf("%lld vs %lld\n", (long long)(baset - lastt), (long long)arg1);
 455 #endif
 456
 457         if ((int)(baset - lastt) >= arg1)
 458                 return(1);
 459         return(0);
 460 }
 461
 462 /*
 463  * Store the start time of the last successful operation.
 464  */
 465 static void
 466 save_period(const char *snapshots_path, const char *cmd,
 467                         time_t savet)
 468 {
 469         char *ocheck_path;
 470         char *ncheck_path;
 471         FILE *fp;
 472
 473         asprintf(&ocheck_path, "%s/.%s.period", snapshots_path, cmd);
 474         asprintf(&ncheck_path, "%s/.%s.period.new", snapshots_path, cmd);
 475         fp = fopen(ncheck_path, "w");
 476         if (fp) {
 477                 fprintf(fp, "0x%08llx\n", (long long)savet);
 478                 if (fclose(fp) == 0)
 479                         rename(ncheck_path, ocheck_path);
 480                 remove(ncheck_path);
 481         } else {
 482                 fprintf(stderr, "hammer: Unable to create period-file %s: %s\n",
 483                         ncheck_path, strerror(errno));
 484         }
 485 }
 486
 487 /*
 488  * Simply count the number of softlinks in the snapshots dir
 489  */
 490 static int
 491 check_softlinks(const char *snapshots_path)
 492 {
 493         struct dirent *den;
 494         struct stat st;
 495         DIR *dir;
 496         char *fpath;
 497         int res = 0;
 498
 499         if ((dir = opendir(snapshots_path)) != NULL) {
 500                 while ((den = readdir(dir)) != NULL) {
 501                         if (den->d_name[0] == '.')
 502                                 continue;
 503                         asprintf(&fpath, "%s/%s", snapshots_path, den->d_name);
 504                         if (lstat(fpath, &st) == 0 && S_ISLNK(st.st_mode))
 505                                 ++res;
 506                         free(fpath);
 507                 }
 508                 closedir(dir);
 509         }
 510         return(res);
 511 }
 512
 513 /*
 514  * Clean up expired softlinks in the snapshots dir
 515  */
 516 static void
 517 cleanup_softlinks(const char *path __unused, const char *snapshots_path,
 518                   int arg2, char *arg3)
 519 {
 520         struct dirent *den;
 521         struct stat st;
 522         DIR *dir;
 523         char *fpath;
 524         int anylink = 0;
 525
 526         if (arg3 != NULL && strstr(arg3, "any") != NULL)
 527                 anylink = 1;
 528
 529         if ((dir = opendir(snapshots_path)) != NULL) {
 530                 while ((den = readdir(dir)) != NULL) {
 531                         if (den->d_name[0] == '.')
 532                                 continue;
 533                         asprintf(&fpath, "%s/%s", snapshots_path, den->d_name);
 534                         if (lstat(fpath, &st) == 0 && S_ISLNK(st.st_mode) &&
 535                             (anylink || strncmp(den->d_name, "snap-", 5) == 0)
 536                         ) {
 537                                 if (check_expired(den->d_name, arg2)) {
 538                                         if (VerboseOpt) {
 539                                                 printf("    expire %s\n",
 540                                                         fpath);
 541                                         }
 542                                         remove(fpath);
 543                                 }
 544                         }
 545                         free(fpath);
 546                 }
 547                 closedir(dir);
 548         }
 549 }
 550
 551 /*
 552  * Take a softlink path in the form snap-yyyymmdd-hhmm and the
 553  * expiration in seconds (arg2) and return non-zero if the softlink
 554  * has expired.
 555  */
 556 static int
 557 check_expired(const char *fpath, int arg2)
 558 {
 559         struct tm tm;
 560         time_t t;
 561         int year;
 562         int month;
 563         int day = 0;
 564         int hour = 0;
 565         int minute = 0;
 566         int r;
 567
 568         while (*fpath && *fpath != '-' && *fpath != '.')
 569                 ++fpath;
 570         if (*fpath)
 571                 ++fpath;
 572
 573         r = sscanf(fpath, "%4d%2d%2d-%2d%2d",
 574                    &year, &month, &day, &hour, &minute);
 575
 576         if (r >= 3) {
 577                 bzero(&tm, sizeof(tm));
 578                 tm.tm_isdst = -1;
 579                 tm.tm_min = minute;
 580                 tm.tm_hour = hour;
 581                 tm.tm_mday = day;
 582                 tm.tm_mon = month - 1;
 583                 tm.tm_year = year - 1900;
 584                 t = mktime(&tm);
 585                 if (t == (time_t)-1)
 586                         return(0);
 587                 t = time(NULL) - t;
 588                 if ((int)t > arg2)
 589                         return(1);
 590         }
 591         return(0);
 592 }
 593
 594 /*
 595  * Issue a snapshot.
 596  */
 597 static int
 598 create_snapshot(const char *path __unused, const char *snapshots_path,
 599                   int arg1 __unused, int arg2 __unused)
 600 {
 601         int r;
 602
 603         runcmd(&r, "hammer snapshot %s %s", path, snapshots_path);
 604         return(r);
 605 }
 606
 607 static int
 608 cleanup_prune(const char *path __unused, const char *snapshots_path,
 609                   int arg1 __unused, int arg2, int snapshots_disabled)
 610 {
 611         /*
 612          * If snapshots have been disabled run prune-everything instead
 613          * of prune.
 614          */
 615         if (snapshots_disabled && arg2) {
 616                 runcmd(NULL, "hammer -c %s/.prune.cycle -t %d prune-everything %s",
 617                         snapshots_path, arg2, path);
 618         } else if (snapshots_disabled) {
 619                 runcmd(NULL, "hammer prune-everything %s", path);
 620         } else if (arg2) {
 621                 runcmd(NULL, "hammer -c %s/.prune.cycle -t %d prune %s",
 622                         snapshots_path, arg2, snapshots_path);
 623         } else {
 624                 runcmd(NULL, "hammer prune %s", snapshots_path);
 625         }
 626         return(0);
 627 }
 628
 629 static int
 630 cleanup_reblock(const char *path, const char *snapshots_path,
 631                   int arg1 __unused, int arg2)
 632 {
 633         if (VerboseOpt == 0) {
 634                 printf(".");
 635                 fflush(stdout);
 636         }
 637
 638         /*
 639          * When reblocking the B-Tree always reblock everything in normal
 640          * mode.
 641          */
 642         runcmd(NULL,
 643                "hammer -c %s/.reblock-1.cycle -t %d reblock-btree %s",
 644                snapshots_path, arg2, path);
 645         if (VerboseOpt == 0) {
 646                 printf(".");
 647                 fflush(stdout);
 648         }
 649
 650         /*
 651          * When reblocking the inodes always reblock everything in normal
 652          * mode.
 653          */
 654         runcmd(NULL,
 655                "hammer -c %s/.reblock-2.cycle -t %d reblock-inodes %s",
 656                snapshots_path, arg2, path);
 657         if (VerboseOpt == 0) {
 658                 printf(".");
 659                 fflush(stdout);
 660         }
 661
 662         /*
 663          * When reblocking the directories always reblock everything in normal
 664          * mode.
 665          */
 666         runcmd(NULL,
 667                "hammer -c %s/.reblock-4.cycle -t %d reblock-dirs %s",
 668                snapshots_path, arg2, path);
 669         if (VerboseOpt == 0) {
 670                 printf(".");
 671                 fflush(stdout);
 672         }
 673
 674         /*
 675          * Do not reblock all the data in normal mode.
 676          */
 677         runcmd(NULL,
 678                "hammer -c %s/.reblock-3.cycle -t %d reblock-data %s 95",
 679                snapshots_path, arg2, path);
 680         if (VerboseOpt == 0)
 681                 printf("\n");
 682         return(0);
 683 }
 684
 685 static int
 686 cleanup_recopy(const char *path, const char *snapshots_path,
 687                   int arg1 __unused, int arg2)
 688 {
 689         if (VerboseOpt == 0) {
 690                 printf(".");
 691                 fflush(stdout);
 692         }
 693         runcmd(NULL,
 694                "hammer -c %s/.recopy-1.cycle -t %d reblock-btree %s",
 695                snapshots_path, arg2, path);
 696         if (VerboseOpt == 0) {
 697                 printf(".");
 698                 fflush(stdout);
 699         }
 700         runcmd(NULL,
 701                "hammer -c %s/.recopy-2.cycle -t %d reblock-inodes %s",
 702                snapshots_path, arg2, path);
 703         if (VerboseOpt == 0) {
 704                 printf(".");
 705                 fflush(stdout);
 706         }
 707         runcmd(NULL,
 708                "hammer -c %s/.recopy-4.cycle -t %d reblock-dirs %s",
 709                snapshots_path, arg2, path);
 710         if (VerboseOpt == 0) {
 711                 printf(".");
 712                 fflush(stdout);
 713         }
 714         runcmd(NULL,
 715                "hammer -c %s/.recopy-3.cycle -t %d reblock-data %s",
 716                snapshots_path, arg2, path);
 717         if (VerboseOpt == 0)
 718                 printf("\n");
 719         return(0);
 720 }
 721
 722 static
 723 void
 724 runcmd(int *resp, const char *ctl, ...)
 725 {
 726         va_list va;
 727         char *cmd;
 728         char *arg;
 729         char **av;
 730         int n;
 731         int nmax;
 732         int res;
 733         pid_t pid;
 734
 735         /*
 736          * Generate the command
 737          */
 738         va_start(va, ctl);
 739         vasprintf(&cmd, ctl, va);
 740         va_end(va);
 741         if (VerboseOpt)
 742                 printf("    %s\n", cmd);
 743
 744         /*
 745          * Break us down into arguments.  We do not just use system() here
 746          * because it blocks SIGINT and friends.
 747          */
 748         n = 0;
 749         nmax = 16;
 750         av = malloc(sizeof(char *) * nmax);
 751
 752         for (arg = strtok(cmd, WS); arg; arg = strtok(NULL, WS)) {
 753                 if (n == nmax - 1) {
 754                         nmax += 16;
 755                         av = realloc(av, sizeof(char *) * nmax);
 756                 }
 757                 av[n++] = arg;
 758         }
 759         av[n++] = NULL;
 760
 761         /*
 762          * Run the command.
 763          */
 764         RunningIoctl = 1;
 765         if ((pid = fork()) == 0) {
 766                 if (VerboseOpt < 2) {
 767                         int fd = open("/dev/null", O_RDWR);
 768                         dup2(fd, 1);
 769                         close(fd);
 770                 }
 771                 execvp(av[0], av);
 772                 _exit(127);
 773         } else if (pid < 0) {
 774                 res = 127;
 775         } else {
 776                 int status;
 777
 778                 while (waitpid(pid, &status, 0) != pid)
 779                         ;
 780                 res = WEXITSTATUS(status);
 781         }
 782         RunningIoctl = 0;
 783         if (DidInterrupt)
 784                 _exit(1);
 785
 786         free(cmd);
 787         free(av);
 788         if (resp)
 789                 *resp = res;
 790 }