sbin/hammer/cmd_pfs.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_pseudofs.c,v 1.12 2008/10/08 21:01:54 thomas Exp $
  35  */
  36
  37 #include <libgen.h>
  38
  39 #include "hammer.h"
  40
  41 static int scanpfsid(struct hammer_ioc_pseudofs_rw *pfs, const char *path);
  42 static void parse_pfsd_options(char **av, int ac, hammer_pseudofs_data_t pfsd);
  43 static void init_pfsd(hammer_pseudofs_data_t pfsd, int is_slave);
  44 static void pseudofs_usage(int code);
  45 static int timetosecs(char *str);
  46
  47 void
  48 clrpfs(struct hammer_ioc_pseudofs_rw *pfs, hammer_pseudofs_data_t pfsd,
  49         int pfs_id)
  50 {
  51         bzero(pfs, sizeof(*pfs));
  52
  53         if (pfsd)
  54                 pfs->ondisk = pfsd;
  55         else
  56                 pfs->ondisk = malloc(sizeof(*pfs->ondisk));
  57         bzero(pfs->ondisk, sizeof(*pfs->ondisk));
  58
  59         pfs->pfs_id = pfs_id;
  60         pfs->bytes = sizeof(*pfs->ondisk);
  61         pfs->version = HAMMER_IOC_PSEUDOFS_VERSION;
  62 }
  63
  64 /*
  65  * If path is a symlink, return strdup'd path.
  66  * If it's a directory via symlink, strip trailing /
  67  * from strdup'd path and return the symlink.
  68  */
  69 static
  70 char*
  71 getlink(const char *path)
  72 {
  73         int i;
  74         char *linkpath;
  75         struct stat st;
  76
  77         if (lstat(path, &st))
  78                 return(NULL);
  79         linkpath = strdup(path);
  80
  81         if (S_ISDIR(st.st_mode)) {
  82                 i = strlen(linkpath) - 1;
  83                 while (i > 0 && linkpath[i] == '/')
  84                         linkpath[i--] = 0;
  85                 lstat(linkpath, &st);
  86         }
  87         if (S_ISLNK(st.st_mode))
  88                 return(linkpath);
  89
  90         free(linkpath);
  91         return(NULL);
  92 }
  93
  94 /*
  95  * Calculate the PFS id given a path to a file/directory or
  96  * a @@%llx:%d softlink.
  97  */
  98 int
  99 getpfs(struct hammer_ioc_pseudofs_rw *pfs, const char *path)
 100 {
 101         int fd;
 102
 103         clrpfs(pfs, NULL, -1);
 104
 105         /*
 106          * Extract the PFS id.
 107          * dirname(path) is supposed to be a directory in root PFS.
 108          */
 109         if (scanpfsid(pfs, path) == 0)
 110                 path = dirname(path); /* strips trailing / first if any */
 111
 112         /*
 113          * Open the path regardless of scanpfsid() result, since some
 114          * commands can take a regular file/directory (e.g. pfs-status).
 115          */
 116         fd = open(path, O_RDONLY);
 117         if (fd < 0) {
 118                 err(1, "Failed to open %s", path);
 119                 /* not reached */
 120         }
 121
 122         /*
 123          * If pfs.pfs_id has been set to non -1, the file descriptor fd
 124          * could be any fd of HAMMER inodes since HAMMERIOC_GET_PSEUDOFS
 125          * doesn't depend on inode attributes if it's set to a valid id.
 126          */
 127         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, pfs) < 0) {
 128                 err(1, "Cannot access %s", path);
 129                 /* not reached */
 130         }
 131
 132         return(fd);
 133 }
 134
 135 /*
 136  * Extract the PFS id from path.
 137  */
 138 static
 139 int
 140 scanpfsid(struct hammer_ioc_pseudofs_rw *pfs, const char *path)
 141 {
 142         char *linkpath;
 143         char buf[64];
 144         uintmax_t dummy_tid;
 145         struct stat st;
 146
 147         if (stat(path, &st))
 148                 ; /* possibly slave PFS */
 149         else if (S_ISDIR(st.st_mode))
 150                 ; /* possibly master or slave PFS */
 151         else
 152                 return(-1);  /* neither */
 153
 154         linkpath = getlink(path);
 155         if (linkpath) {
 156                 /*
 157                  * Read the symlink assuming it's a link to PFS.
 158                  */
 159                 bzero(buf, sizeof(buf));
 160                 if (readlink(linkpath, buf, sizeof(buf) - 1) < 0) {
 161                         free(linkpath);
 162                         return(-1);
 163                 }
 164                 free(linkpath);
 165                 path = buf;
 166         }
 167
 168         /*
 169          * The symlink created by pfs-master|slave is just a symlink.
 170          * One could happen to remove a symlink and relink PFS as
 171          * # ln -s ./@@-1:00001 ./link
 172          * which results PFS having something extra before @@.
 173          * One could also directly use the PFS and results the same.
 174          * Get rid of it before we extract the PFS id.
 175          */
 176         if (strchr(path, '/')) {
 177                 path = basename(path); /* strips trailing / first if any */
 178                 if (path == NULL) {
 179                         err(1, "basename");
 180                         /* not reached */
 181                 }
 182         }
 183
 184         /*
 185          * Test and extract the PFS id from the link.
 186          * "@@%jx:%d" covers both "@@-1:%05d" format for master PFS
 187          * and "@@0x%016jx:%05d" format for slave PFS.
 188          */
 189         if (sscanf(path, "@@%jx:%d", &dummy_tid, &pfs->pfs_id) == 2) {
 190                 assert(pfs->pfs_id > 0);
 191                 return(0);
 192         }
 193
 194         return(-1);
 195 }
 196
 197 void
 198 relpfs(int fd, struct hammer_ioc_pseudofs_rw *pfs)
 199 {
 200         if (fd >= 0)
 201                 close(fd);
 202         if (pfs->ondisk) {
 203                 free(pfs->ondisk);
 204                 pfs->ondisk = NULL;
 205         }
 206 }
 207
 208 static
 209 void
 210 print_pfs_status(char *path)
 211 {
 212         struct hammer_ioc_pseudofs_rw pfs;
 213         int fd;
 214
 215         fd = getpfs(&pfs, path);
 216         printf("%s\t", path);
 217         if (fd < 0 || ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
 218                 printf("Invalid PFS path %s\n", path);
 219         } else {
 220                 printf("PFS#%d {\n", pfs.pfs_id);
 221                 dump_pfsd(pfs.ondisk, fd);
 222                 printf("}\n");
 223         }
 224         if (fd >= 0)
 225                 close(fd);
 226         if (pfs.ondisk)
 227                 free(pfs.ondisk);
 228         relpfs(fd, &pfs);
 229 }
 230
 231 void
 232 hammer_cmd_pseudofs_status(char **av, int ac)
 233 {
 234         int i;
 235
 236         if (ac == 0) {
 237                 char buf[2] = "."; /* can't be readonly string */
 238                 print_pfs_status(buf);
 239                 return;
 240         }
 241
 242         for (i = 0; i < ac; ++i)
 243                 print_pfs_status(av[i]);
 244 }
 245
 246 void
 247 hammer_cmd_pseudofs_create(char **av, int ac, int is_slave)
 248 {
 249         struct hammer_ioc_pseudofs_rw pfs;
 250         struct hammer_pseudofs_data pfsd;
 251         struct stat st;
 252         const char *path;
 253         char *dirpath;
 254         char *linkpath;
 255         int pfs_id;
 256         int fd;
 257
 258         if (ac == 0) {
 259                 pseudofs_usage(1);
 260                 /* not reached */
 261         }
 262         path = av[0];
 263         if (lstat(path, &st) == 0) {
 264                 errx(1, "Cannot create %s, file exists!", path);
 265                 /* not reached */
 266         } else if (path[strlen(path) - 1] == '/') {
 267                 errx(1, "Invalid PFS path %s with trailing /", path);
 268                 /* not reached */
 269         }
 270
 271         /*
 272          * Figure out the directory prefix, taking care of degenerate
 273          * cases.
 274          */
 275         dirpath = dirname(path);
 276         fd = open(dirpath, O_RDONLY);
 277         if (fd < 0) {
 278                 err(1, "Cannot open directory %s", dirpath);
 279                 /* not reached */
 280         }
 281
 282         /*
 283          * Avoid foot-shooting.  Don't let the user create a PFS
 284          * softlink via a PFS.  PFS softlinks may only be accessed
 285          * via the master filesystem.  Checking it here ensures
 286          * other PFS commands access PFS under the master filesystem.
 287          */
 288         clrpfs(&pfs, &pfsd, -1);
 289
 290         ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs);
 291         if (pfs.pfs_id != HAMMER_ROOT_PFSID) {
 292                 fprintf(stderr,
 293                         "You are attempting to access a PFS softlink "
 294                         "from a PFS.  It may not represent the PFS\n"
 295                         "on the main filesystem mount that you "
 296                         "expect!  You may only access PFS softlinks\n"
 297                         "via the main filesystem mount!\n");
 298                 exit(1);
 299         }
 300
 301         for (pfs_id = 0; pfs_id < HAMMER_MAX_PFS; ++pfs_id) {
 302                 clrpfs(&pfs, &pfsd, pfs_id);
 303                 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
 304                         if (errno != ENOENT) {
 305                                 err(1, "Cannot create %s", path);
 306                                 /* not reached */
 307                         }
 308                         break;
 309                 }
 310         }
 311         if (pfs_id == HAMMER_MAX_PFS) {
 312                 errx(1, "Cannot create %s, all PFSs in use", path);
 313                 /* not reached */
 314         } else if (pfs_id == HAMMER_ROOT_PFSID) {
 315                 errx(1, "Fatal error: PFS#%d must exist", HAMMER_ROOT_PFSID);
 316                 /* not reached */
 317         }
 318
 319         /*
 320          * Create the new PFS
 321          */
 322         printf("Creating PFS#%d\t", pfs_id);
 323         clrpfs(&pfs, &pfsd, pfs_id);
 324         init_pfsd(&pfsd, is_slave);
 325
 326         if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
 327                 printf("failed: %s\n", strerror(errno));
 328         } else {
 329                 /* special symlink, must be exactly 10 characters */
 330                 asprintf(&linkpath, "@@PFS%05d", pfs_id);
 331                 if (symlink(linkpath, path) < 0) {
 332                         printf("failed: cannot create symlink: %s\n",
 333                                 strerror(errno));
 334                 } else {
 335                         printf("succeeded!\n");
 336                         hammer_cmd_pseudofs_update(av, ac);
 337                 }
 338         }
 339         free(dirpath);
 340         close(fd);
 341 }
 342
 343 void
 344 hammer_cmd_pseudofs_destroy(char **av, int ac)
 345 {
 346         struct hammer_ioc_pseudofs_rw pfs;
 347         char *linkpath;
 348         int fd;
 349         int i;
 350
 351         if (ac == 0) {
 352                 pseudofs_usage(1);
 353                 /* not reached */
 354         }
 355         fd = getpfs(&pfs, av[0]);
 356
 357         if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
 358                 errx(1, "You cannot destroy PFS#%d", HAMMER_ROOT_PFSID);
 359                 /* not reached */
 360         }
 361
 362         printf("You have requested that PFS#%d (%s) be destroyed\n",
 363                 pfs.pfs_id, pfs.ondisk->label);
 364         printf("This will irrevocably destroy all data on this PFS!!!!!\n");
 365         printf("Do you really want to do this? [y/n] ");
 366         fflush(stdout);
 367         if (getyn() == 0) {
 368                 errx(1, "No action taken on PFS#%d", pfs.pfs_id);
 369                 /* not reached */
 370         }
 371
 372         if (hammer_is_pfs_master(pfs.ondisk)) {
 373                 printf("This PFS is currently setup as a MASTER!\n");
 374                 printf("Are you absolutely sure you want to destroy it? [y/n] ");
 375                 fflush(stdout);
 376                 if (getyn() == 0) {
 377                         errx(1, "No action taken on PFS#%d", pfs.pfs_id);
 378                         /* not reached */
 379                 }
 380         }
 381
 382         printf("Destroying PFS#%d (%s)", pfs.pfs_id, pfs.ondisk->label);
 383         if (DebugOpt) {
 384                 printf("\n");
 385         } else {
 386                 printf(" in");
 387                 for (i = 5; i; --i) {
 388                         printf(" %d", i);
 389                         fflush(stdout);
 390                         sleep(1);
 391                 }
 392                 printf(".. starting destruction pass\n");
 393         }
 394
 395         /*
 396          * Remove the softlink on success.
 397          */
 398         if (ioctl(fd, HAMMERIOC_RMR_PSEUDOFS, &pfs) == 0) {
 399                 printf("pfs-destroy of PFS#%d succeeded!\n", pfs.pfs_id);
 400                 linkpath = getlink(av[0]);
 401                 if (linkpath) {
 402                         if (remove(linkpath) < 0) {
 403                                 err(1, "Unable to remove softlink %s", linkpath);
 404                                 /* not reached */
 405                         }
 406                         free(linkpath);
 407                 }
 408         } else {
 409                 printf("pfs-destroy of PFS#%d failed: %s\n",
 410                         pfs.pfs_id, strerror(errno));
 411         }
 412         relpfs(fd, &pfs);
 413 }
 414
 415 void
 416 hammer_cmd_pseudofs_upgrade(char **av, int ac)
 417 {
 418         struct hammer_ioc_pseudofs_rw pfs;
 419         int fd;
 420
 421         if (ac == 0) {
 422                 pseudofs_usage(1);
 423                 /* not reached */
 424         }
 425         fd = getpfs(&pfs, av[0]);
 426
 427         if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
 428                 errx(1, "You cannot upgrade PFS#%d"
 429                         " (It should already be a master)",
 430                         HAMMER_ROOT_PFSID);
 431                 /* not reached */
 432         } else if (hammer_is_pfs_master(pfs.ondisk)) {
 433                 errx(1, "It is already a master");
 434                 /* not reached */
 435         }
 436
 437         if (ioctl(fd, HAMMERIOC_UPG_PSEUDOFS, &pfs) == 0) {
 438                 printf("pfs-upgrade of PFS#%d (%s) succeeded\n",
 439                         pfs.pfs_id, pfs.ondisk->label);
 440         } else {
 441                 err(1, "pfs-upgrade of PFS#%d (%s) failed",
 442                         pfs.pfs_id, pfs.ondisk->label);
 443                 /* not reached */
 444         }
 445         relpfs(fd, &pfs);
 446 }
 447
 448 void
 449 hammer_cmd_pseudofs_downgrade(char **av, int ac)
 450 {
 451         struct hammer_ioc_pseudofs_rw pfs;
 452         int fd;
 453
 454         if (ac == 0) {
 455                 pseudofs_usage(1);
 456                 /* not reached */
 457         }
 458         fd = getpfs(&pfs, av[0]);
 459
 460         if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
 461                 errx(1, "You cannot downgrade PFS#%d", HAMMER_ROOT_PFSID);
 462                 /* not reached */
 463         } else if (hammer_is_pfs_slave(pfs.ondisk)) {
 464                 errx(1, "It is already a slave");
 465                 /* not reached */
 466         }
 467
 468         if (ioctl(fd, HAMMERIOC_DGD_PSEUDOFS, &pfs) == 0) {
 469                 printf("pfs-downgrade of PFS#%d (%s) succeeded\n",
 470                         pfs.pfs_id, pfs.ondisk->label);
 471         } else {
 472                 err(1, "pfs-downgrade of PFS#%d (%s) failed",
 473                         pfs.pfs_id, pfs.ondisk->label);
 474                 /* not reached */
 475         }
 476         relpfs(fd, &pfs);
 477 }
 478
 479 void
 480 hammer_cmd_pseudofs_update(char **av, int ac)
 481 {
 482         struct hammer_ioc_pseudofs_rw pfs;
 483         int fd;
 484
 485         if (ac == 0) {
 486                 pseudofs_usage(1);
 487                 /* not reached */
 488         }
 489         fd = getpfs(&pfs, av[0]);
 490
 491         printf("%s\n", av[0]);
 492         fflush(stdout);
 493
 494         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) == 0) {
 495                 parse_pfsd_options(av + 1, ac - 1, pfs.ondisk);
 496                 if (hammer_is_pfs_slave(pfs.ondisk) &&
 497                     pfs.pfs_id == HAMMER_ROOT_PFSID) {
 498                         errx(1, "The real mount point cannot be made a PFS "
 499                                "slave, only PFS sub-directories can be made "
 500                                "slaves");
 501                         /* not reached */
 502                 }
 503                 pfs.bytes = sizeof(*pfs.ondisk);
 504                 if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) == 0) {
 505                         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) == 0) {
 506                                 dump_pfsd(pfs.ondisk, fd);
 507                         } else {
 508                                 err(1, "Unable to retrieve PFS configuration "
 509                                         "after successful update");
 510                                 /* not reached */
 511                         }
 512                 } else {
 513                         err(1, "Unable to adjust PFS configuration");
 514                         /* not reached */
 515                 }
 516         }
 517         relpfs(fd, &pfs);
 518 }
 519
 520 static
 521 void
 522 init_pfsd(hammer_pseudofs_data_t pfsd, int is_slave)
 523 {
 524         uint32_t status;
 525
 526         bzero(pfsd, sizeof(*pfsd));
 527         pfsd->sync_beg_tid = 1;
 528         pfsd->sync_end_tid = 1;
 529         pfsd->sync_beg_ts = 0;
 530         pfsd->sync_end_ts = 0;
 531         uuid_create(&pfsd->shared_uuid, &status);
 532         uuid_create(&pfsd->unique_uuid, &status);
 533         if (is_slave)
 534                 pfsd->mirror_flags |= HAMMER_PFSD_SLAVE;
 535 }
 536
 537 void
 538 dump_pfsd(hammer_pseudofs_data_t pfsd, int fd)
 539 {
 540         struct hammer_ioc_version       version;
 541         uint32_t status;
 542         char *str = NULL;
 543
 544         printf("    sync-beg-tid=0x%016jx\n", (uintmax_t)pfsd->sync_beg_tid);
 545         printf("    sync-end-tid=0x%016jx\n", (uintmax_t)pfsd->sync_end_tid);
 546         uuid_to_string(&pfsd->shared_uuid, &str, &status);
 547         printf("    shared-uuid=%s\n", str);
 548         free(str);
 549         uuid_to_string(&pfsd->unique_uuid, &str, &status);
 550         printf("    unique-uuid=%s\n", str);
 551         free(str);
 552         printf("    label=\"%s\"\n", pfsd->label);
 553         if (pfsd->snapshots[0])
 554                 printf("    snapshots=\"%s\"\n", pfsd->snapshots);
 555         if (pfsd->prune_min < (60 * 60 * 24)) {
 556                 printf("    prune-min=%02d:%02d:%02d\n",
 557                         pfsd->prune_min / 60 / 60 % 24,
 558                         pfsd->prune_min / 60 % 60,
 559                         pfsd->prune_min % 60);
 560         } else if (pfsd->prune_min % (60 * 60 * 24)) {
 561                 printf("    prune-min=%dd/%02d:%02d:%02d\n",
 562                         pfsd->prune_min / 60 / 60 / 24,
 563                         pfsd->prune_min / 60 / 60 % 24,
 564                         pfsd->prune_min / 60 % 60,
 565                         pfsd->prune_min % 60);
 566         } else {
 567                 printf("    prune-min=%dd\n", pfsd->prune_min / 60 / 60 / 24);
 568         }
 569
 570         if (hammer_is_pfs_slave(pfsd))
 571                 printf("    operating as a SLAVE\n");
 572         else
 573                 printf("    operating as a MASTER\n");
 574
 575         /*
 576          * Snapshots directory cannot be shown when there is no fd since
 577          * hammer version can't be retrieved. mirror-dump passes -1 because
 578          * its input came from mirror-read output thus no path is available
 579          * to open(2).
 580          */
 581         if (fd >= 0 && pfsd->snapshots[0] == 0) {
 582                 bzero(&version, sizeof(version));
 583                 if (ioctl(fd, HAMMERIOC_GET_VERSION, &version) < 0)
 584                         return;
 585                 HammerVersion = version.cur_version;
 586                 if (version.cur_version < 3) {
 587                         if (hammer_is_pfs_slave(pfsd)) {
 588                                 printf("    snapshots directory not set for "
 589                                        "slave\n");
 590                         } else {
 591                                 printf("    snapshots directory for master "
 592                                        "defaults to <pfs>/snapshots\n");
 593                         }
 594                 } else {
 595                         printf("    snapshots directory defaults to "
 596                                "/var/hammer/<pfs>\n");
 597                 }
 598         }
 599 }
 600
 601 static
 602 void
 603 parse_pfsd_options(char **av, int ac, hammer_pseudofs_data_t pfsd)
 604 {
 605         char *cmd;
 606         char *ptr;
 607         int len;
 608         uint32_t status;
 609
 610         while (ac) {
 611                 cmd = *av;
 612                 if ((ptr = strchr(cmd, '=')) != NULL)
 613                         *ptr++ = 0;
 614
 615                 /*
 616                  * Basic assignment value test
 617                  */
 618                 if (ptr == NULL) {
 619                         errx(1, "option %s requires an assignment", cmd);
 620                         /* not reached */
 621                 }
 622
 623                 status = uuid_s_ok;
 624                 if (strcmp(cmd, "sync-beg-tid") == 0) {
 625                         pfsd->sync_beg_tid = strtoull(ptr, NULL, 16);
 626                 } else if (strcmp(cmd, "sync-end-tid") == 0) {
 627                         pfsd->sync_end_tid = strtoull(ptr, NULL, 16);
 628                 } else if (strcmp(cmd, "shared-uuid") == 0) {
 629                         uuid_from_string(ptr, &pfsd->shared_uuid, &status);
 630                 } else if (strcmp(cmd, "unique-uuid") == 0) {
 631                         uuid_from_string(ptr, &pfsd->unique_uuid, &status);
 632                 } else if (strcmp(cmd, "label") == 0) {
 633                         len = strlen(ptr);
 634                         if (ptr[0] == '"' && ptr[len-1] == '"') {
 635                                 ptr[len-1] = 0;
 636                                 ++ptr;
 637                         } else if (ptr[0] == '"') {
 638                                 errx(1, "option %s: malformed string", cmd);
 639                                 /* not reached */
 640                         }
 641                         snprintf(pfsd->label, sizeof(pfsd->label), "%s", ptr);
 642                 } else if (strcmp(cmd, "snapshots") == 0) {
 643                         len = strlen(ptr);
 644                         if (ptr[0] != '/') {
 645                                 fprintf(stderr,
 646                                         "option %s: '%s' must be an "
 647                                         "absolute path\n", cmd, ptr);
 648                                 if (ptr[0] == 0) {
 649                                         fprintf(stderr,
 650                                                 "use 'snapshots-clear' "
 651                                                 "to unset snapshots dir\n");
 652                                 }
 653                                 exit(1);
 654                         }
 655                         if (len >= (int)sizeof(pfsd->snapshots)) {
 656                                 errx(1, "option %s: path too long, %d "
 657                                         "character limit", cmd, len);
 658                                 /* not reached */
 659                         }
 660                         snprintf(pfsd->snapshots, sizeof(pfsd->snapshots),
 661                                  "%s", ptr);
 662                 } else if (strcmp(cmd, "snapshots-clear") == 0) {
 663                         pfsd->snapshots[0] = 0;
 664                 } else if (strcmp(cmd, "prune-min") == 0) {
 665                         pfsd->prune_min = timetosecs(ptr);
 666                         if (pfsd->prune_min < 0) {
 667                                 errx(1, "option %s: illegal time spec, "
 668                                         "use Nd or [Nd/]hh[:mm[:ss]]", ptr);
 669                                 /* not reached */
 670                         }
 671                 } else {
 672                         errx(1, "invalid option: %s", cmd);
 673                         /* not reached */
 674                 }
 675                 if (status != uuid_s_ok) {
 676                         errx(1, "option %s: error parsing uuid %s", cmd, ptr);
 677                         /* not reached */
 678                 }
 679                 --ac;
 680                 ++av;
 681         }
 682 }
 683
 684 static
 685 void
 686 pseudofs_usage(int code)
 687 {
 688         fprintf(stderr,
 689                 "hammer pfs-status <dirpath> ...\n"
 690                 "hammer pfs-master <dirpath> [options]\n"
 691                 "hammer pfs-slave <dirpath> [options]\n"
 692                 "hammer pfs-update <dirpath> [options]\n"
 693                 "hammer pfs-upgrade <dirpath>\n"
 694                 "hammer pfs-downgrade <dirpath>\n"
 695                 "hammer pfs-destroy <dirpath>\n"
 696                 "\n"
 697                 "options:\n"
 698                 "    sync-beg-tid=0x16llx\n"
 699                 "    sync-end-tid=0x16llx\n"
 700                 "    shared-uuid=0x16llx\n"
 701                 "    unique-uuid=0x16llx\n"
 702                 "    label=\"string\"\n"
 703                 "    snapshots=\"/path\"\n"
 704                 "    snapshots-clear\n"
 705                 "    prune-min=Nd\n"
 706                 "    prune-min=[Nd/]hh[:mm[:ss]]\n"
 707         );
 708         exit(code);
 709 }
 710
 711 /*
 712  * Convert time in the form [Nd/]hh[:mm[:ss]] to seconds.
 713  *
 714  * Return -1 if a parse error occurs.
 715  * Return 0x7FFFFFFF if the time exceeds the maximum allowed.
 716  */
 717 static
 718 int
 719 timetosecs(char *str)
 720 {
 721         int days = 0;
 722         int hrs = 0;
 723         int mins = 0;
 724         int secs = 0;
 725         int n;
 726         long long v;
 727         char *ptr;
 728
 729         n = strtol(str, &ptr, 10);
 730         if (n < 0)
 731                 return(-1);
 732         if (*ptr == 'd') {
 733                 days = n;
 734                 ++ptr;
 735                 if (*ptr == '/')
 736                     n = strtol(ptr + 1, &ptr, 10);
 737                 else
 738                     n = 0;
 739         }
 740         if (n < 0)
 741                 return(-1);
 742         hrs = n;
 743         if (*ptr == ':') {
 744                 n = strtol(ptr + 1, &ptr, 10);
 745                 if (n < 0)
 746                         return(-1);
 747                 mins = n;
 748                 if (*ptr == ':') {
 749                         n = strtol(ptr + 1, &ptr, 10);
 750                         if (n < 0)
 751                                 return(-1);
 752                         secs = n;
 753                 }
 754         }
 755         if (*ptr)
 756                 return(-1);
 757         v = days * 24 * 60 * 60 + hrs *  60 * 60 + mins * 60 + secs;
 758         if (v > 0x7FFFFFFF)
 759                 v = 0x7FFFFFFF;
 760         return((int)v);
 761 }