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 cleanup_snapshots(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         FILE *fp;
  95         char *fs, *ptr, *path;
  96         char buf[256];
  97
  98         tzset();
  99         if (ac == 0) {
 100                 fp = popen("/sbin/mount -t hammer,null", "r");
 101                 if (fp == NULL)
 102                         errx(1, "hammer cleanup: 'mount' failed");
 103                 while (fgets(buf, sizeof(buf), fp) != NULL) {
 104                         fs = strtok(buf, WS);
 105                         if (fs == NULL)
 106                                 continue;
 107                         ptr = strtok(NULL, WS);
 108                         if (ptr == NULL)
 109                                 continue;
 110                         path = strtok(NULL, WS);
 111                         if (path == NULL)
 112                                 continue;
 113                         ptr = strtok(NULL, WS);
 114                         if (ptr == NULL)
 115                                 continue;
 116                         if ((strncmp(ptr, "(hammer,", 8) == 0) ||
 117                             ((strncmp(ptr, "(null,", 6) == 0) &&
 118                              (strstr(fs, "/@@0x") != NULL ||
 119                               strstr(fs, "/@@-1") != NULL))) {
 120                                 do_cleanup(path);
 121                         }
 122                 }
 123                 fclose(fp);
 124         } else {
 125                 while (ac) {
 126                         do_cleanup(*av);
 127                         --ac;
 128                         ++av;
 129                 }
 130         }
 131 }
 132
 133 static
 134 void
 135 do_cleanup(const char *path)
 136 {
 137         struct hammer_ioc_pseudofs_rw pfs;
 138         union hammer_ioc_mrecord_any mrec_tmp;
 139         char *snapshots_path;
 140         char *config_path;
 141         struct stat st;
 142         char *cmd;
 143         char *ptr;
 144         int arg1;
 145         int arg2;
 146         char *arg3;
 147         time_t savet;
 148         char buf[256];
 149         FILE *fp;
 150         struct didpfs *didpfs;
 151         int snapshots_disabled = 0;
 152         int prune_warning = 0;
 153         int fd;
 154         int r;
 155
 156         bzero(&pfs, sizeof(pfs));
 157         bzero(&mrec_tmp, sizeof(mrec_tmp));
 158         pfs.ondisk = &mrec_tmp.pfs.pfsd;
 159         pfs.bytes = sizeof(mrec_tmp.pfs.pfsd);
 160         pfs.pfs_id = -1;
 161
 162         printf("cleanup %-20s -", path);
 163         fd = open(path, O_RDONLY);
 164         if (fd < 0) {
 165                 printf(" unable to access directory: %s\n", strerror(errno));
 166                 return;
 167         }
 168         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
 169                 printf(" not a HAMMER filesystem: %s\n", strerror(errno));
 170                 return;
 171         }
 172         close(fd);
 173         if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION) {
 174                 printf(" unrecognized HAMMER version\n");
 175                 return;
 176         }
 177
 178         /*
 179          * Make sure we have not already handled this PFS.  Several nullfs
 180          * mounts might alias the same PFS.
 181          */
 182         for (didpfs = FirstPFS; didpfs; didpfs = didpfs->next) {
 183                 if (bcmp(&didpfs->uuid, &mrec_tmp.pfs.pfsd.unique_uuid, sizeof(uuid_t)) == 0) {
 184                         printf(" PFS #%d already handled\n", pfs.pfs_id);
 185                         return;
 186                 }
 187         }
 188         didpfs = malloc(sizeof(*didpfs));
 189         didpfs->next = FirstPFS;
 190         FirstPFS = didpfs;
 191         didpfs->uuid = mrec_tmp.pfs.pfsd.unique_uuid;
 192
 193         /*
 194          * Figure out where the snapshot directory is.
 195          */
 196         if (mrec_tmp.pfs.pfsd.snapshots[0] == '/') {
 197                 asprintf(&snapshots_path, "%s", mrec_tmp.pfs.pfsd.snapshots);
 198         } else if (mrec_tmp.pfs.pfsd.snapshots[0]) {
 199                 printf(" WARNING: pfs-slave's snapshots dir is not absolute\n");
 200                 return;
 201         } else if (mrec_tmp.pfs.pfsd.mirror_flags & HAMMER_PFSD_SLAVE) {
 202                 printf(" WARNING: must configure snapshot dir for PFS slave\n");
 203                 printf("\tWe suggest <fs>/var/slaves/<name> where "
 204                        "<fs> is the base HAMMER fs\n");
 205                 printf("\tcontaining the slave\n");
 206                 return;
 207         } else {
 208                 asprintf(&snapshots_path,
 209                          "%s%ssnapshots", path, dividing_slash(path));
 210         }
 211
 212         /*
 213          * Create a snapshot directory if necessary, and a config file if
 214          * necessary.
 215          */
 216         if (stat(snapshots_path, &st) < 0) {
 217                 if (mkdir(snapshots_path, 0755) != 0) {
 218                         free(snapshots_path);
 219                         printf(" unable to create snapshot dir \"%s\": %s\n",
 220                                 snapshots_path, strerror(errno));
 221                         return;
 222                 }
 223         }
 224         asprintf(&config_path, "%s/config", snapshots_path);
 225         if ((fp = fopen(config_path, "r")) == NULL) {
 226                 fp = fopen(config_path, "w");
 227                 if (fp == NULL) {
 228                         printf(" cannot create %s: %s\n",
 229                                 config_path, strerror(errno));
 230                         return;
 231                 }
 232                 if (strcmp(path, "/tmp") == 0 ||
 233                     strcmp(path, "/var/tmp") == 0 ||
 234                     strcmp(path, "/usr/obj") == 0) {
 235                         fprintf(fp, "snapshots 0d 0d\n");
 236                 } else {
 237                         fprintf(fp, "snapshots 1d 60d\n");
 238                 }
 239                 fprintf(fp,
 240                         "prune     1d 5m\n"
 241                         "reblock   1d 5m\n"
 242                         "recopy    30d 10m\n");
 243                 fclose(fp);
 244                 fp = fopen(config_path, "r");
 245         }
 246         if (fp == NULL) {
 247                 printf(" cannot access %s: %s\n",
 248                        config_path, strerror(errno));
 249                 return;
 250         }
 251
 252         printf(" handle PFS #%d using %s\n", pfs.pfs_id, snapshots_path);
 253
 254         /*
 255          * Process the config file
 256          */
 257         while (fgets(buf, sizeof(buf), fp) != NULL) {
 258                 cmd = strtok(buf, WS);
 259                 arg1 = 0;
 260                 arg2 = 0;
 261                 arg3 = NULL;
 262                 if ((ptr = strtok(NULL, WS)) != NULL) {
 263                         arg1 = strtosecs(ptr);
 264                         if ((ptr = strtok(NULL, WS)) != NULL) {
 265                                 arg2 = strtosecs(ptr);
 266                                 arg3 = strtok(NULL, WS);
 267                         }
 268                 }
 269
 270                 printf("%20s - ", cmd);
 271                 fflush(stdout);
 272
 273                 r = 1;
 274                 if (strcmp(cmd, "snapshots") == 0) {
 275                         if (arg1 == 0) {
 276                                 if (arg2 && check_softlinks(snapshots_path)) {
 277                                         printf("only removing old snapshots\n");
 278                                         prune_warning = 1;
 279                                         cleanup_softlinks(path, snapshots_path,
 280                                                           arg2, arg3);
 281                                 } else {
 282                                         printf("disabled\n");
 283                                         snapshots_disabled = 1;
 284                                 }
 285                         } else
 286                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 287                                 printf("run\n");
 288                                 cleanup_softlinks(path, snapshots_path,
 289                                                   arg2, arg3);
 290                                 r = cleanup_snapshots(path, snapshots_path,
 291                                                   arg1, arg2);
 292                         } else {
 293                                 printf("skip\n");
 294                         }
 295                 } else if (arg1 == 0) {
 296                         /*
 297                          * The commands following this check can't handle
 298                          * a period of 0, so call the feature disabled and
 299                          * ignore the directive.
 300                          */
 301                         printf("disabled\n");
 302                 } else if (strcmp(cmd, "prune") == 0) {
 303                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 304                                 if (prune_warning) {
 305                                         printf("run - WARNING snapshot "
 306                                                "softlinks present "
 307                                                "but snapshots disabled\n");
 308                                 } else {
 309                                         printf("run\n");
 310                                 }
 311                                 r = cleanup_prune(path, snapshots_path,
 312                                               arg1, arg2, snapshots_disabled);
 313                         } else {
 314                                 printf("skip\n");
 315                         }
 316                 } else if (strcmp(cmd, "reblock") == 0) {
 317                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 318                                 printf("run");
 319                                 fflush(stdout);
 320                                 if (VerboseOpt)
 321                                         printf("\n");
 322                                 r = cleanup_reblock(path, snapshots_path,
 323                                                 arg1, arg2);
 324                         } else {
 325                                 printf("skip\n");
 326                         }
 327                 } else if (strcmp(cmd, "recopy") == 0) {
 328                         if (check_period(snapshots_path, cmd, arg1, &savet)) {
 329                                 printf("run");
 330                                 fflush(stdout);
 331                                 if (VerboseOpt)
 332                                         printf("\n");
 333                                 r = cleanup_recopy(path, snapshots_path,
 334                                                arg1, arg2);
 335                         } else {
 336                                 printf("skip\n");
 337                         }
 338                 } else {
 339                         printf("unknown directive\n");
 340                         r = 1;
 341                 }
 342                 if (r == 0)
 343                         save_period(snapshots_path, cmd, savet);
 344         }
 345         fclose(fp);
 346         usleep(1000);
 347 }
 348
 349 static
 350 int
 351 strtosecs(char *ptr)
 352 {
 353         int val;
 354
 355         val = strtol(ptr, &ptr, 0);
 356         switch(*ptr) {
 357         case 'd':
 358                 val *= 24;
 359                 /* fall through */
 360         case 'h':
 361                 val *= 60;
 362                 /* fall through */
 363         case 'm':
 364                 val *= 60;
 365                 /* fall through */
 366         case 's':
 367                 break;
 368         default:
 369                 errx(1, "illegal suffix converting %s\n", ptr);
 370                 break;
 371         }
 372         return(val);
 373 }
 374
 375 static const char *
 376 dividing_slash(const char *path)
 377 {
 378         int len = strlen(path);
 379         if (len && path[len-1] == '/')
 380                 return("");
 381         else
 382                 return("/");
 383 }
 384
 385 /*
 386  * Check whether the desired period has elapsed since the last successful
 387  * run.  The run may take a while and cross a boundary so we remember the
 388  * current time_t so we can save it later on.
 389  *
 390  * Periods in minutes, hours, or days are assumed to have been crossed
 391  * if the local time crosses a minute, hour, or day boundary regardless
 392  * of how close the last operation actually was.
 393  */
 394 static int
 395 check_period(const char *snapshots_path, const char *cmd, int arg1,
 396         time_t *savep)
 397 {
 398         char *check_path;
 399         struct tm tp1;
 400         struct tm tp2;
 401         FILE *fp;
 402         time_t baset, lastt;
 403         char buf[256];
 404
 405         time(savep);
 406         localtime_r(savep, &tp1);
 407
 408         /*
 409          * Retrieve the start time of the last successful operation.
 410          */
 411         asprintf(&check_path, "%s/.%s.period", snapshots_path, cmd);
 412         fp = fopen(check_path, "r");
 413         free(check_path);
 414         if (fp == NULL)
 415                 return(1);
 416         if (fgets(buf, sizeof(buf), fp) == NULL) {
 417                 fclose(fp);
 418                 return(1);
 419         }
 420         fclose(fp);
 421
 422         lastt = strtol(buf, NULL, 0);
 423         localtime_r(&lastt, &tp2);
 424
 425         /*
 426          * Normalize the times.  e.g. if asked to do something on a 1-day
 427          * interval the operation will be performed as soon as the day
 428          * turns over relative to the previous operation, even if the previous
 429          * operation ran a few seconds ago just before midnight.
 430          */
 431         if (arg1 % 60 == 0) {
 432                 tp1.tm_sec = 0;
 433                 tp2.tm_sec = 0;
 434         }
 435         if (arg1 % (60 * 60) == 0) {
 436                 tp1.tm_min = 0;
 437                 tp2.tm_min = 0;
 438         }
 439         if (arg1 % (24 * 60 * 60) == 0) {
 440                 tp1.tm_hour = 0;
 441                 tp2.tm_hour = 0;
 442         }
 443
 444         baset = mktime(&tp1);
 445         lastt = mktime(&tp2);
 446
 447 #if 0
 448         printf("%lld vs %lld\n", (long long)(baset - lastt), (long long)arg1);
 449 #endif
 450
 451         if ((int)(baset - lastt) >= arg1)
 452                 return(1);
 453         return(0);
 454 }
 455
 456 /*
 457  * Store the start time of the last successful operation.
 458  */
 459 static void
 460 save_period(const char *snapshots_path, const char *cmd,
 461                         time_t savet)
 462 {
 463         char *ocheck_path;
 464         char *ncheck_path;
 465         FILE *fp;
 466
 467         asprintf(&ocheck_path, "%s/.%s.period", snapshots_path, cmd);
 468         asprintf(&ncheck_path, "%s/.%s.period.new", snapshots_path, cmd);
 469         fp = fopen(ncheck_path, "w");
 470         fprintf(fp, "0x%08llx\n", (long long)savet);
 471         if (fclose(fp) == 0)
 472                 rename(ncheck_path, ocheck_path);
 473         remove(ncheck_path);
 474 }
 475
 476 /*
 477  * Simply count the number of softlinks in the snapshots dir
 478  */
 479 static int
 480 check_softlinks(const char *snapshots_path)
 481 {
 482         struct dirent *den;
 483         struct stat st;
 484         DIR *dir;
 485         char *fpath;
 486         int res = 0;
 487
 488         if ((dir = opendir(snapshots_path)) != NULL) {
 489                 while ((den = readdir(dir)) != NULL) {
 490                         if (den->d_name[0] == '.')
 491                                 continue;
 492                         asprintf(&fpath, "%s/%s", snapshots_path, den->d_name);
 493                         if (lstat(fpath, &st) == 0 && S_ISLNK(st.st_mode))
 494                                 ++res;
 495                         free(fpath);
 496                 }
 497                 closedir(dir);
 498         }
 499         return(res);
 500 }
 501
 502 /*
 503  * Clean up expired softlinks in the snapshots dir
 504  */
 505 static void
 506 cleanup_softlinks(const char *path __unused, const char *snapshots_path,
 507                   int arg2, char *arg3)
 508 {
 509         struct dirent *den;
 510         struct stat st;
 511         DIR *dir;
 512         char *fpath;
 513         int anylink = 0;
 514
 515         if (arg3 != NULL && strstr(arg3, "any") != NULL)
 516                 anylink = 1;
 517
 518         if ((dir = opendir(snapshots_path)) != NULL) {
 519                 while ((den = readdir(dir)) != NULL) {
 520                         if (den->d_name[0] == '.')
 521                                 continue;
 522                         asprintf(&fpath, "%s/%s", snapshots_path, den->d_name);
 523                         if (lstat(fpath, &st) == 0 && S_ISLNK(st.st_mode) &&
 524                             (anylink || strncmp(den->d_name, "snap-", 5) == 0)
 525                         ) {
 526                                 if (check_expired(den->d_name, arg2)) {
 527                                         if (VerboseOpt) {
 528                                                 printf("    expire %s\n",
 529                                                         fpath);
 530                                         }
 531                                         remove(fpath);
 532                                 }
 533                         }
 534                         free(fpath);
 535                 }
 536                 closedir(dir);
 537         }
 538 }
 539
 540 /*
 541  * Take a softlink path in the form snap-yyyymmdd-hhmm and the
 542  * expiration in seconds (arg2) and return non-zero if the softlink
 543  * has expired.
 544  */
 545 static int
 546 check_expired(const char *fpath, int arg2)
 547 {
 548         struct tm tm;
 549         time_t t;
 550         int year;
 551         int month;
 552         int day = 0;
 553         int hour = 0;
 554         int minute = 0;
 555         int r;
 556
 557         while (*fpath && *fpath != '-' && *fpath != '.')
 558                 ++fpath;
 559         if (*fpath)
 560                 ++fpath;
 561
 562         r = sscanf(fpath, "%4d%2d%2d-%2d%2d",
 563                    &year, &month, &day, &hour, &minute);
 564
 565         if (r >= 3) {
 566                 bzero(&tm, sizeof(tm));
 567                 tm.tm_isdst = -1;
 568                 tm.tm_min = minute;
 569                 tm.tm_hour = hour;
 570                 tm.tm_mday = day;
 571                 tm.tm_mon = month - 1;
 572                 tm.tm_year = year - 1900;
 573                 t = mktime(&tm);
 574                 if (t == (time_t)-1)
 575                         return(0);
 576                 t = time(NULL) - t;
 577                 if ((int)t > arg2)
 578                         return(1);
 579         }
 580         return(0);
 581 }
 582
 583 /*
 584  * Issue a snapshot.
 585  */
 586 static int
 587 cleanup_snapshots(const char *path __unused, const char *snapshots_path,
 588                   int arg1 __unused, int arg2 __unused)
 589 {
 590         int r;
 591
 592         runcmd(&r, "hammer snapshot %s %s", path, snapshots_path);
 593         return(r);
 594 }
 595
 596 static int
 597 cleanup_prune(const char *path __unused, const char *snapshots_path,
 598                   int arg1 __unused, int arg2, int snapshots_disabled)
 599 {
 600         /*
 601          * If snapshots have been disabled run prune-everything instead
 602          * of prune.
 603          */
 604         if (snapshots_disabled && arg2) {
 605                 runcmd(NULL, "hammer -c %s/.prune.cycle -t %d prune-everything %s",
 606                         snapshots_path, arg2, path);
 607         } else if (snapshots_disabled) {
 608                 runcmd(NULL, "hammer prune-everything %s", path);
 609         } else if (arg2) {
 610                 runcmd(NULL, "hammer -c %s/.prune.cycle -t %d prune %s",
 611                         snapshots_path, arg2, snapshots_path);
 612         } else {
 613                 runcmd(NULL, "hammer prune %s", snapshots_path);
 614         }
 615         return(0);
 616 }
 617
 618 static int
 619 cleanup_reblock(const char *path, const char *snapshots_path,
 620                   int arg1 __unused, int arg2)
 621 {
 622         if (VerboseOpt == 0) {
 623                 printf(".");
 624                 fflush(stdout);
 625         }
 626
 627         /*
 628          * When reblocking the B-Tree always reblock everything in normal
 629          * mode.
 630          */
 631         runcmd(NULL,
 632                "hammer -c %s/.reblock-1.cycle -t %d reblock-btree %s",
 633                snapshots_path, arg2, path);
 634         if (VerboseOpt == 0) {
 635                 printf(".");
 636                 fflush(stdout);
 637         }
 638
 639         /*
 640          * When reblocking the inodes always reblock everything in normal
 641          * mode.
 642          */
 643         runcmd(NULL,
 644                "hammer -c %s/.reblock-2.cycle -t %d reblock-inodes %s",
 645                snapshots_path, arg2, path);
 646         if (VerboseOpt == 0) {
 647                 printf(".");
 648                 fflush(stdout);
 649         }
 650
 651         /*
 652          * When reblocking the directories always reblock everything in normal
 653          * mode.
 654          */
 655         runcmd(NULL,
 656                "hammer -c %s/.reblock-4.cycle -t %d reblock-dirs %s",
 657                snapshots_path, arg2, path);
 658         if (VerboseOpt == 0) {
 659                 printf(".");
 660                 fflush(stdout);
 661         }
 662
 663         /*
 664          * Do not reblock all the data in normal mode.
 665          */
 666         runcmd(NULL,
 667                "hammer -c %s/.reblock-3.cycle -t %d reblock-data %s 95",
 668                snapshots_path, arg2, path);
 669         if (VerboseOpt == 0)
 670                 printf("\n");
 671         return(0);
 672 }
 673
 674 static int
 675 cleanup_recopy(const char *path, const char *snapshots_path,
 676                   int arg1 __unused, int arg2)
 677 {
 678         if (VerboseOpt == 0) {
 679                 printf(".");
 680                 fflush(stdout);
 681         }
 682         runcmd(NULL,
 683                "hammer -c %s/.recopy-1.cycle -t %d reblock-btree %s",
 684                snapshots_path, arg2, path);
 685         if (VerboseOpt == 0) {
 686                 printf(".");
 687                 fflush(stdout);
 688         }
 689         runcmd(NULL,
 690                "hammer -c %s/.recopy-2.cycle -t %d reblock-inodes %s",
 691                snapshots_path, arg2, path);
 692         if (VerboseOpt == 0) {
 693                 printf(".");
 694                 fflush(stdout);
 695         }
 696         runcmd(NULL,
 697                "hammer -c %s/.recopy-4.cycle -t %d reblock-dirs %s",
 698                snapshots_path, arg2, path);
 699         if (VerboseOpt == 0) {
 700                 printf(".");
 701                 fflush(stdout);
 702         }
 703         runcmd(NULL,
 704                "hammer -c %s/.recopy-3.cycle -t %d reblock-data %s",
 705                snapshots_path, arg2, path);
 706         if (VerboseOpt == 0)
 707                 printf("\n");
 708         return(0);
 709 }
 710
 711 static
 712 void
 713 runcmd(int *resp, const char *ctl, ...)
 714 {
 715         va_list va;
 716         char *cmd;
 717         char *arg;
 718         char **av;
 719         int n;
 720         int nmax;
 721         int res;
 722         pid_t pid;
 723
 724         /*
 725          * Generate the command
 726          */
 727         va_start(va, ctl);
 728         vasprintf(&cmd, ctl, va);
 729         va_end(va);
 730         if (VerboseOpt)
 731                 printf("    %s\n", cmd);
 732
 733         /*
 734          * Break us down into arguments.  We do not just use system() here
 735          * because it blocks SIGINT and friends.
 736          */
 737         n = 0;
 738         nmax = 16;
 739         av = malloc(sizeof(char *) * nmax);
 740
 741         for (arg = strtok(cmd, WS); arg; arg = strtok(NULL, WS)) {
 742                 if (n == nmax - 1) {
 743                         nmax += 16;
 744                         av = realloc(av, sizeof(char *) * nmax);
 745                 }
 746                 av[n++] = arg;
 747         }
 748         av[n++] = NULL;
 749
 750         /*
 751          * Run the command.
 752          */
 753         RunningIoctl = 1;
 754         if ((pid = fork()) == 0) {
 755                 if (VerboseOpt < 2) {
 756                         int fd = open("/dev/null", O_RDWR);
 757                         dup2(fd, 1);
 758                         close(fd);
 759                 }
 760                 execvp(av[0], av);
 761                 _exit(127);
 762         } else if (pid < 0) {
 763                 res = 127;
 764         } else {
 765                 int status;
 766
 767                 while (waitpid(pid, &status, 0) != pid)
 768                         ;
 769                 res = WEXITSTATUS(status);
 770         }
 771         RunningIoctl = 0;
 772         if (DidInterrupt)
 773                 _exit(1);
 774
 775         free(cmd);
 776         free(av);
 777         if (resp)
 778                 *resp = res;
 779 }
 780
 781