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 char*
  70 getlink(const char *path)
  71 {
  72         int i;
  73         char *linkpath;
  74         struct stat st;
  75
  76         if (lstat(path, &st))
  77                 return(NULL);
  78         linkpath = strdup(path);
  79
  80         if (S_ISDIR(st.st_mode)) {
  81                 i = strlen(linkpath) - 1;
  82                 while (i > 0 && linkpath[i] == '/')
  83                         linkpath[i--] = 0;
  84                 lstat(linkpath, &st);
  85         }
  86         if (S_ISLNK(st.st_mode)) {
  87                 return(linkpath);
  88         }
  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 PFS#0.
 108          */
 109         if (scanpfsid(pfs, path) == 0) {
 110                 path = dirname(path); /* strips trailing / first if any */
 111         }
 112
 113         /*
 114          * Open the path regardless of scanpfsid() result, since some
 115          * commands can take a regular file/directory (e.g. pfs-status).
 116          */
 117         fd = open(path, O_RDONLY);
 118         if (fd < 0) {
 119                 fprintf(stderr, "Failed to open %s\n", path);
 120                 exit(1);
 121         }
 122
 123         /*
 124          * If pfs.pfs_id has been set to non -1, the file descriptor fd
 125          * could be any fd of HAMMER inodes since HAMMERIOC_GET_PSEUDOFS
 126          * doesn't depend on inode attributes if it's set to a valid id.
 127          */
 128         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, pfs) < 0) {
 129                 fprintf(stderr, "Cannot access %s: %s\n",
 130                         path, strerror(errno));
 131                 exit(1);
 132         }
 133         return(fd);
 134 }
 135
 136 /*
 137  * Extract the PFS id from path.
 138  */
 139 static 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
 155         linkpath = getlink(path);
 156         if (linkpath) {
 157                 /*
 158                  * Read the symlink assuming it's a link to PFS.
 159                  */
 160                 bzero(buf, sizeof(buf));
 161                 if (readlink(linkpath, buf, sizeof(buf) - 1) < 0) {
 162                         free(linkpath);
 163                         return(-1);
 164                 }
 165                 free(linkpath);
 166                 path = buf;
 167         }
 168
 169         /*
 170          * The symlink created by pfs-master|slave is just a symlink.
 171          * One could happen to remove a symlink and relink PFS as
 172          * # ln -s ./@@-1:00001 ./link
 173          * which results PFS having something extra before @@.
 174          * One could also directly use the PFS and results the same.
 175          * Get rid of it before we extract the PFS id.
 176          */
 177         if (strchr(path, '/')) {
 178                 path = basename(path); /* strips trailing / first if any */
 179                 if (path == NULL)
 180                         err(1, "basename");
 181         }
 182
 183         /*
 184          * Test and extract the PFS id from the link.
 185          * "@@%jx:%d" convers both "@@-1:%05d" format for master PFS
 186          * and "@@0x%016jx:%05d" format for slave PFS.
 187          */
 188         if (sscanf(path, "@@%jx:%d", &dummy_tid, &pfs->pfs_id) == 2) {
 189                 assert(pfs->pfs_id > 0);
 190                 return(0);
 191         }
 192
 193         return(-1);
 194 }
 195
 196 void
 197 relpfs(int fd, struct hammer_ioc_pseudofs_rw *pfs)
 198 {
 199         if (fd >= 0)
 200                 close(fd);
 201         if (pfs->ondisk) {
 202                 free(pfs->ondisk);
 203                 pfs->ondisk = NULL;
 204         }
 205 }
 206
 207 static void
 208 print_pfs_status(char *path)
 209 {
 210         struct hammer_ioc_pseudofs_rw pfs;
 211         int fd;
 212
 213         fd = getpfs(&pfs, path);
 214         printf("%s\t", path);
 215         if (fd < 0 || ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
 216                 printf("Invalid PFS path %s\n", path);
 217         } else {
 218                 printf("PFS#%d {\n", pfs.pfs_id);
 219                 dump_pfsd(pfs.ondisk, fd);
 220                 printf("}\n");
 221         }
 222         if (fd >= 0)
 223                 close(fd);
 224         if (pfs.ondisk)
 225                 free(pfs.ondisk);
 226         relpfs(fd, &pfs);
 227 }
 228
 229 void
 230 hammer_cmd_pseudofs_status(char **av, int ac)
 231 {
 232         int i;
 233
 234         if (ac == 0) {
 235                 char buf[2] = "."; /* can't be readonly string */
 236                 print_pfs_status(buf);
 237                 return;
 238         }
 239
 240         for (i = 0; i < ac; ++i)
 241                 print_pfs_status(av[i]);
 242 }
 243
 244 void
 245 hammer_cmd_pseudofs_create(char **av, int ac, int is_slave)
 246 {
 247         struct hammer_ioc_pseudofs_rw pfs;
 248         struct hammer_pseudofs_data pfsd;
 249         struct stat st;
 250         const char *path;
 251         char *dirpath;
 252         char *linkpath;
 253         int pfs_id;
 254         int fd;
 255         int error;
 256
 257         if (ac == 0)
 258                 pseudofs_usage(1);
 259         path = av[0];
 260         if (lstat(path, &st) == 0) {
 261                 fprintf(stderr, "Cannot create %s, file exists!\n", path);
 262                 exit(1);
 263         } else if (path[strlen(path) - 1] == '/') {
 264                 fprintf(stderr, "Invalid PFS path %s with trailing /\n", path);
 265                 exit(1);
 266         }
 267
 268         /*
 269          * Figure out the directory prefix, taking care of degenerate
 270          * cases.
 271          */
 272         dirpath = dirname(path);
 273         fd = open(dirpath, O_RDONLY);
 274         if (fd < 0) {
 275                 fprintf(stderr, "Cannot open directory %s\n", dirpath);
 276                 exit(1);
 277         }
 278
 279         /*
 280          * Avoid foot-shooting.  Don't let the user create a PFS
 281          * softlink via a PFS.  PFS softlinks may only be accessed
 282          * via the master filesystem.  Checking it here ensures
 283          * other PFS commands access PFS under the master filesystem.
 284          */
 285         clrpfs(&pfs, &pfsd, -1);
 286
 287         ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs);
 288         if (pfs.pfs_id != HAMMER_ROOT_PFSID) {
 289                 fprintf(stderr,
 290                         "You are attempting to access a PFS softlink "
 291                         "from a PFS.  It may not represent the PFS\n"
 292                         "on the main filesystem mount that you "
 293                         "expect!  You may only access PFS softlinks\n"
 294                         "via the main filesystem mount!\n");
 295                 exit(1);
 296         }
 297
 298         error = 0;
 299         for (pfs_id = 0; pfs_id < HAMMER_MAX_PFS; ++pfs_id) {
 300                 clrpfs(&pfs, &pfsd, pfs_id);
 301                 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
 302                         error = errno;
 303                         break;
 304                 }
 305         }
 306         if (pfs_id == HAMMER_MAX_PFS) {
 307                 fprintf(stderr, "Cannot create %s, all PFSs in use\n", path);
 308                 exit(1);
 309         } else if (pfs_id == HAMMER_ROOT_PFSID) {
 310                 fprintf(stderr, "Fatal error: PFS#%d must exist\n",
 311                         HAMMER_ROOT_PFSID);
 312                 exit(1);
 313         }
 314
 315         if (error != ENOENT) {
 316                 fprintf(stderr, "Cannot create %s, got %s during scan\n",
 317                         path, strerror(error));
 318                 exit(1);
 319         }
 320
 321         /*
 322          * Create the new PFS
 323          */
 324         printf("Creating PFS#%d\t", pfs_id);
 325         clrpfs(&pfs, &pfsd, pfs_id);
 326         init_pfsd(&pfsd, is_slave);
 327
 328         if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
 329                 printf("failed: %s\n", strerror(errno));
 330         } else {
 331                 /* special symlink, must be exactly 10 characters */
 332                 asprintf(&linkpath, "@@PFS%05d", pfs_id);
 333                 if (symlink(linkpath, path) < 0) {
 334                         printf("failed: cannot create symlink: %s\n",
 335                                 strerror(errno));
 336                 } else {
 337                         printf("succeeded!\n");
 338                         hammer_cmd_pseudofs_update(av, ac);
 339                 }
 340         }
 341         free(dirpath);
 342         close(fd);
 343 }
 344
 345 void
 346 hammer_cmd_pseudofs_destroy(char **av, int ac)
 347 {
 348         struct hammer_ioc_pseudofs_rw pfs;
 349         char *linkpath;
 350         int fd;
 351         int i;
 352
 353         if (ac == 0)
 354                 pseudofs_usage(1);
 355         fd = getpfs(&pfs, av[0]);
 356
 357         if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
 358                 fprintf(stderr, "You cannot destroy PFS#0\n");
 359                 exit(1);
 360         }
 361         printf("You have requested that PFS#%d (%s) be destroyed\n",
 362                 pfs.pfs_id, pfs.ondisk->label);
 363         printf("This will irrevocably destroy all data on this PFS!!!!!\n");
 364         printf("Do you really want to do this? ");
 365         fflush(stdout);
 366         if (getyn() == 0) {
 367                 fprintf(stderr, "No action taken on PFS#%d\n", pfs.pfs_id);
 368                 exit(1);
 369         }
 370
 371         if (hammer_is_pfs_master(pfs.ondisk)) {
 372                 printf("This PFS is currently setup as a MASTER!\n");
 373                 printf("Are you absolutely sure you want to destroy it? ");
 374                 fflush(stdout);
 375                 if (getyn() == 0) {
 376                         fprintf(stderr, "No action taken on PFS#%d\n",
 377                                 pfs.pfs_id);
 378                         exit(1);
 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                                 fprintf(stderr,
 404                                         "Unable to remove softlink %s: %s\n",
 405                                         linkpath, strerror(errno));
 406                                         /* exit status 0 anyway */
 407                         }
 408                         free(linkpath);
 409                 }
 410         } else {
 411                 printf("pfs-destroy of PFS#%d failed: %s\n",
 412                         pfs.pfs_id, strerror(errno));
 413         }
 414         relpfs(fd, &pfs);
 415 }
 416
 417 void
 418 hammer_cmd_pseudofs_upgrade(char **av, int ac)
 419 {
 420         struct hammer_ioc_pseudofs_rw pfs;
 421         int fd;
 422
 423         if (ac == 0)
 424                 pseudofs_usage(1);
 425         fd = getpfs(&pfs, av[0]);
 426
 427         if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
 428                 fprintf(stderr, "You cannot upgrade PFS#0"
 429                                 " (It should already be a master)\n");
 430                 exit(1);
 431         } else if (hammer_is_pfs_master(pfs.ondisk)) {
 432                 printf("It is already a master\n");
 433                 exit(1);
 434         }
 435
 436         if (ioctl(fd, HAMMERIOC_UPG_PSEUDOFS, &pfs) == 0) {
 437                 printf("pfs-upgrade of PFS#%d (%s) succeeded\n",
 438                         pfs.pfs_id, pfs.ondisk->label);
 439         } else {
 440                 fprintf(stderr, "pfs-upgrade of PFS#%d (%s) failed: %s\n",
 441                         pfs.pfs_id, pfs.ondisk->label, strerror(errno));
 442         }
 443         relpfs(fd, &pfs);
 444 }
 445
 446 void
 447 hammer_cmd_pseudofs_downgrade(char **av, int ac)
 448 {
 449         struct hammer_ioc_pseudofs_rw pfs;
 450         int fd;
 451
 452         if (ac == 0)
 453                 pseudofs_usage(1);
 454         fd = getpfs(&pfs, av[0]);
 455
 456         if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
 457                 fprintf(stderr, "You cannot downgrade PFS#0\n");
 458                 exit(1);
 459         } else if (hammer_is_pfs_slave(pfs.ondisk)) {
 460                 printf("It is already a slave\n");
 461                 exit(1);
 462         }
 463
 464         if (ioctl(fd, HAMMERIOC_DGD_PSEUDOFS, &pfs) == 0) {
 465                 printf("pfs-downgrade of PFS#%d (%s) succeeded\n",
 466                         pfs.pfs_id, pfs.ondisk->label);
 467         } else {
 468                 fprintf(stderr, "pfs-downgrade of PFS#%d (%s) failed: %s\n",
 469                         pfs.pfs_id, pfs.ondisk->label, strerror(errno));
 470         }
 471         relpfs(fd, &pfs);
 472 }
 473
 474 void
 475 hammer_cmd_pseudofs_update(char **av, int ac)
 476 {
 477         struct hammer_ioc_pseudofs_rw pfs;
 478         int fd;
 479
 480         if (ac == 0)
 481                 pseudofs_usage(1);
 482         fd = getpfs(&pfs, av[0]);
 483
 484         printf("%s\n", av[0]);
 485         fflush(stdout);
 486
 487         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) == 0) {
 488                 parse_pfsd_options(av + 1, ac - 1, pfs.ondisk);
 489                 if (hammer_is_pfs_slave(pfs.ondisk) &&
 490                     pfs.pfs_id == HAMMER_ROOT_PFSID) {
 491                         printf("The real mount point cannot be made a PFS "
 492                                "slave, only PFS sub-directories can be made "
 493                                "slaves\n");
 494                         exit(1);
 495                 }
 496                 pfs.bytes = sizeof(*pfs.ondisk);
 497                 if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) == 0) {
 498                         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) == 0) {
 499                                 dump_pfsd(pfs.ondisk, fd);
 500                         } else {
 501                                 printf("Unable to retrieve PFS configuration "
 502                                         "after successful update: %s\n",
 503                                         strerror(errno));
 504                                 exit(1);
 505                         }
 506                 } else {
 507                         printf("Unable to adjust PFS configuration: %s\n",
 508                                 strerror(errno));
 509                         exit(1);
 510                 }
 511         }
 512         relpfs(fd, &pfs);
 513 }
 514
 515 static void
 516 init_pfsd(hammer_pseudofs_data_t pfsd, int is_slave)
 517 {
 518         uint32_t status;
 519
 520         bzero(pfsd, sizeof(*pfsd));
 521         pfsd->sync_beg_tid = 1;
 522         pfsd->sync_end_tid = 1;
 523         pfsd->sync_beg_ts = 0;
 524         pfsd->sync_end_ts = 0;
 525         uuid_create(&pfsd->shared_uuid, &status);
 526         uuid_create(&pfsd->unique_uuid, &status);
 527         if (is_slave)
 528                 pfsd->mirror_flags |= HAMMER_PFSD_SLAVE;
 529 }
 530
 531 void
 532 dump_pfsd(hammer_pseudofs_data_t pfsd, int fd)
 533 {
 534         struct hammer_ioc_version       version;
 535         uint32_t status;
 536         char *str = NULL;
 537
 538         printf("    sync-beg-tid=0x%016jx\n", (uintmax_t)pfsd->sync_beg_tid);
 539         printf("    sync-end-tid=0x%016jx\n", (uintmax_t)pfsd->sync_end_tid);
 540         uuid_to_string(&pfsd->shared_uuid, &str, &status);
 541         printf("    shared-uuid=%s\n", str);
 542         free(str);
 543         uuid_to_string(&pfsd->unique_uuid, &str, &status);
 544         printf("    unique-uuid=%s\n", str);
 545         free(str);
 546         printf("    label=\"%s\"\n", pfsd->label);
 547         if (pfsd->snapshots[0])
 548                 printf("    snapshots=\"%s\"\n", pfsd->snapshots);
 549         if (pfsd->prune_min < (60 * 60 * 24)) {
 550                 printf("    prune-min=%02d:%02d:%02d\n",
 551                         pfsd->prune_min / 60 / 60 % 24,
 552                         pfsd->prune_min / 60 % 60,
 553                         pfsd->prune_min % 60);
 554         } else if (pfsd->prune_min % (60 * 60 * 24)) {
 555                 printf("    prune-min=%dd/%02d:%02d:%02d\n",
 556                         pfsd->prune_min / 60 / 60 / 24,
 557                         pfsd->prune_min / 60 / 60 % 24,
 558                         pfsd->prune_min / 60 % 60,
 559                         pfsd->prune_min % 60);
 560         } else {
 561                 printf("    prune-min=%dd\n", pfsd->prune_min / 60 / 60 / 24);
 562         }
 563
 564         if (hammer_is_pfs_slave(pfsd)) {
 565                 printf("    operating as a SLAVE\n");
 566         } else {
 567                 printf("    operating as a MASTER\n");
 568         }
 569
 570         /*
 571          * Snapshots directory cannot be shown when there is no fd since
 572          * hammer version can't be retrieved. mirror-dump passes -1 because
 573          * its input came from mirror-read output thus no path is available
 574          * to open(2).
 575          */
 576         if (fd >= 0 && pfsd->snapshots[0] == 0) {
 577                 bzero(&version, sizeof(version));
 578                 if (ioctl(fd, HAMMERIOC_GET_VERSION, &version) < 0)
 579                         return;
 580                 if (version.cur_version < 3) {
 581                         if (hammer_is_pfs_slave(pfsd)) {
 582                                 printf("    snapshots directory not set for "
 583                                        "slave\n");
 584                         } else {
 585                                 printf("    snapshots directory for master "
 586                                        "defaults to <pfs>/snapshots\n");
 587                         }
 588                 } else {
 589                         printf("    snapshots directory defaults to "
 590                                "/var/hammer/<pfs>\n");
 591                 }
 592         }
 593 }
 594
 595 static void
 596 parse_pfsd_options(char **av, int ac, hammer_pseudofs_data_t pfsd)
 597 {
 598         char *cmd;
 599         char *ptr;
 600         int len;
 601         uint32_t status;
 602
 603         while (ac) {
 604                 cmd = *av;
 605                 if ((ptr = strchr(cmd, '=')) != NULL)
 606                         *ptr++ = 0;
 607
 608                 /*
 609                  * Basic assignment value test
 610                  */
 611                 if (ptr == NULL) {
 612                         fprintf(stderr,
 613                                 "option %s requires an assignment\n",
 614                                 cmd);
 615                         exit(1);
 616                 }
 617
 618                 status = uuid_s_ok;
 619                 if (strcmp(cmd, "sync-beg-tid") == 0) {
 620                         pfsd->sync_beg_tid = strtoull(ptr, NULL, 16);
 621                 } else if (strcmp(cmd, "sync-end-tid") == 0) {
 622                         pfsd->sync_end_tid = strtoull(ptr, NULL, 16);
 623                 } else if (strcmp(cmd, "shared-uuid") == 0) {
 624                         uuid_from_string(ptr, &pfsd->shared_uuid, &status);
 625                 } else if (strcmp(cmd, "unique-uuid") == 0) {
 626                         uuid_from_string(ptr, &pfsd->unique_uuid, &status);
 627                 } else if (strcmp(cmd, "label") == 0) {
 628                         len = strlen(ptr);
 629                         if (ptr[0] == '"' && ptr[len-1] == '"') {
 630                                 ptr[len-1] = 0;
 631                                 ++ptr;
 632                         } else if (ptr[0] == '"') {
 633                                 fprintf(stderr,
 634                                         "option %s: malformed string\n",
 635                                         cmd);
 636                                 exit(1);
 637                         }
 638                         snprintf(pfsd->label, sizeof(pfsd->label), "%s", ptr);
 639                 } else if (strcmp(cmd, "snapshots") == 0) {
 640                         len = strlen(ptr);
 641                         if (ptr[0] != '/') {
 642                                 fprintf(stderr,
 643                                         "option %s: '%s' must be an "
 644                                         "absolute path\n", cmd, ptr);
 645                                 if (ptr[0] == 0) {
 646                                         fprintf(stderr,
 647                                                 "use 'snapshots-clear' "
 648                                                 "to unset snapshots dir\n");
 649                                 }
 650                                 exit(1);
 651                         }
 652                         if (len >= (int)sizeof(pfsd->snapshots)) {
 653                                 fprintf(stderr,
 654                                         "option %s: path too long, %d "
 655                                         "character limit\n", cmd, len);
 656                                 exit(1);
 657                         }
 658                         snprintf(pfsd->snapshots, sizeof(pfsd->snapshots),
 659                                  "%s", ptr);
 660                 } else if (strcmp(cmd, "snapshots-clear") == 0) {
 661                         pfsd->snapshots[0] = 0;
 662                 } else if (strcmp(cmd, "prune-min") == 0) {
 663                         pfsd->prune_min = timetosecs(ptr);
 664                         if (pfsd->prune_min < 0) {
 665                                 fprintf(stderr,
 666                                         "option %s: illegal time spec, "
 667                                         "use Nd or [Nd/]hh[:mm[:ss]]\n", ptr);
 668                                 exit(1);
 669                         }
 670                 } else {
 671                         fprintf(stderr, "invalid option: %s\n", cmd);
 672                         exit(1);
 673                 }
 674                 if (status != uuid_s_ok) {
 675                         fprintf(stderr, "option %s: error parsing uuid %s\n",
 676                                 cmd, ptr);
 677                         exit(1);
 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 }