cmds-balance.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <getopt.h>
  22 #include <sys/ioctl.h>
  23 #include <errno.h>
  24
  25 #include "kerncompat.h"
  26 #include "ctree.h"
  27 #include "ioctl.h"
  28 #include "volumes.h"
  29
  30 #include "commands.h"
  31
  32 static const char * const balance_cmd_group_usage[] = {
  33         "btrfs [filesystem] balance <command> [options] <path>",
  34         "btrfs [filesystem] balance <path>",
  35         NULL
  36 };
  37
  38 static const char balance_cmd_group_info[] =
  39         "'btrfs filesystem balance' command is deprecated, please use\n"
  40         "'btrfs balance start' command instead.";
  41
  42 static int parse_one_profile(const char *profile, u64 *flags)
  43 {
  44         if (!strcmp(profile, "raid0")) {
  45                 *flags |= BTRFS_BLOCK_GROUP_RAID0;
  46         } else if (!strcmp(profile, "raid1")) {
  47                 *flags |= BTRFS_BLOCK_GROUP_RAID1;
  48         } else if (!strcmp(profile, "raid10")) {
  49                 *flags |= BTRFS_BLOCK_GROUP_RAID10;
  50         } else if (!strcmp(profile, "dup")) {
  51                 *flags |= BTRFS_BLOCK_GROUP_DUP;
  52         } else if (!strcmp(profile, "single")) {
  53                 *flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
  54         } else {
  55                 fprintf(stderr, "Unknown profile '%s'\n", profile);
  56                 return 1;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static int parse_profiles(char *profiles, u64 *flags)
  63 {
  64         char *this_char;
  65         char *save_ptr;
  66
  67         for (this_char = strtok_r(profiles, "|", &save_ptr);
  68              this_char != NULL;
  69              this_char = strtok_r(NULL, "|", &save_ptr)) {
  70                 if (parse_one_profile(this_char, flags))
  71                         return 1;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static int parse_u64(const char *str, u64 *result)
  78 {
  79         char *endptr;
  80         u64 val;
  81
  82         val = strtoull(str, &endptr, 10);
  83         if (*endptr)
  84                 return 1;
  85
  86         *result = val;
  87         return 0;
  88 }
  89
  90 static int parse_range(const char *range, u64 *start, u64 *end)
  91 {
  92         char *dots;
  93
  94         dots = strstr(range, "..");
  95         if (dots) {
  96                 const char *rest = dots + 2;
  97                 int skipped = 0;
  98
  99                 *dots = 0;
 100
 101                 if (!*rest) {
 102                         *end = (u64)-1;
 103                         skipped++;
 104                 } else {
 105                         if (parse_u64(rest, end))
 106                                 return 1;
 107                 }
 108                 if (dots == range) {
 109                         *start = 0;
 110                         skipped++;
 111                 } else {
 112                         if (parse_u64(range, start))
 113                                 return 1;
 114                 }
 115
 116                 if (*start >= *end) {
 117                         fprintf(stderr, "Range %llu..%llu doesn't make "
 118                                 "sense\n", (unsigned long long)*start,
 119                                 (unsigned long long)*end);
 120                         return 1;
 121                 }
 122
 123                 if (skipped <= 1)
 124                         return 0;
 125         }
 126
 127         return 1;
 128 }
 129
 130 static int parse_filters(char *filters, struct btrfs_balance_args *args)
 131 {
 132         char *this_char;
 133         char *value;
 134         char *save_ptr;
 135
 136         if (!filters)
 137                 return 0;
 138
 139         for (this_char = strtok_r(filters, ",", &save_ptr);
 140              this_char != NULL;
 141              this_char = strtok_r(NULL, ",", &save_ptr)) {
 142                 if ((value = strchr(this_char, '=')) != NULL)
 143                         *value++ = 0;
 144                 if (!strcmp(this_char, "profiles")) {
 145                         if (!value || !*value) {
 146                                 fprintf(stderr, "the profiles filter requires "
 147                                        "an argument\n");
 148                                 return 1;
 149                         }
 150                         if (parse_profiles(value, &args->profiles)) {
 151                                 fprintf(stderr, "Invalid profiles argument\n");
 152                                 return 1;
 153                         }
 154                         args->flags |= BTRFS_BALANCE_ARGS_PROFILES;
 155                 } else if (!strcmp(this_char, "usage")) {
 156                         if (!value || !*value) {
 157                                 fprintf(stderr, "the usage filter requires "
 158                                        "an argument\n");
 159                                 return 1;
 160                         }
 161                         if (parse_u64(value, &args->usage) ||
 162                             args->usage < 1 || args->usage > 100) {
 163                                 fprintf(stderr, "Invalid usage argument: %s\n",
 164                                        value);
 165                                 return 1;
 166                         }
 167                         args->flags |= BTRFS_BALANCE_ARGS_USAGE;
 168                 } else if (!strcmp(this_char, "devid")) {
 169                         if (!value || !*value) {
 170                                 fprintf(stderr, "the devid filter requires "
 171                                        "an argument\n");
 172                                 return 1;
 173                         }
 174                         if (parse_u64(value, &args->devid) ||
 175                             args->devid == 0) {
 176                                 fprintf(stderr, "Invalid devid argument: %s\n",
 177                                        value);
 178                                 return 1;
 179                         }
 180                         args->flags |= BTRFS_BALANCE_ARGS_DEVID;
 181                 } else if (!strcmp(this_char, "drange")) {
 182                         if (!value || !*value) {
 183                                 fprintf(stderr, "the drange filter requires "
 184                                        "an argument\n");
 185                                 return 1;
 186                         }
 187                         if (parse_range(value, &args->pstart, &args->pend)) {
 188                                 fprintf(stderr, "Invalid drange argument\n");
 189                                 return 1;
 190                         }
 191                         args->flags |= BTRFS_BALANCE_ARGS_DRANGE;
 192                 } else if (!strcmp(this_char, "vrange")) {
 193                         if (!value || !*value) {
 194                                 fprintf(stderr, "the vrange filter requires "
 195                                        "an argument\n");
 196                                 return 1;
 197                         }
 198                         if (parse_range(value, &args->vstart, &args->vend)) {
 199                                 fprintf(stderr, "Invalid vrange argument\n");
 200                                 return 1;
 201                         }
 202                         args->flags |= BTRFS_BALANCE_ARGS_VRANGE;
 203                 } else if (!strcmp(this_char, "convert")) {
 204                         if (!value || !*value) {
 205                                 fprintf(stderr, "the convert option requires "
 206                                        "an argument\n");
 207                                 return 1;
 208                         }
 209                         if (parse_one_profile(value, &args->target)) {
 210                                 fprintf(stderr, "Invalid convert argument\n");
 211                                 return 1;
 212                         }
 213                         args->flags |= BTRFS_BALANCE_ARGS_CONVERT;
 214                 } else if (!strcmp(this_char, "soft")) {
 215                         args->flags |= BTRFS_BALANCE_ARGS_SOFT;
 216                 } else {
 217                         fprintf(stderr, "Unrecognized balance option '%s'\n",
 218                                 this_char);
 219                         return 1;
 220                 }
 221         }
 222
 223         return 0;
 224 }
 225
 226 static void dump_balance_args(struct btrfs_balance_args *args)
 227 {
 228         if (args->flags & BTRFS_BALANCE_ARGS_CONVERT) {
 229                 printf("converting, target=%llu, soft is %s",
 230                        (unsigned long long)args->target,
 231                        (args->flags & BTRFS_BALANCE_ARGS_SOFT) ? "on" : "off");
 232         } else {
 233                 printf("balancing");
 234         }
 235
 236         if (args->flags & BTRFS_BALANCE_ARGS_PROFILES)
 237                 printf(", profiles=%llu", (unsigned long long)args->profiles);
 238         if (args->flags & BTRFS_BALANCE_ARGS_USAGE)
 239                 printf(", usage=%llu", (unsigned long long)args->usage);
 240         if (args->flags & BTRFS_BALANCE_ARGS_DEVID)
 241                 printf(", devid=%llu", (unsigned long long)args->devid);
 242         if (args->flags & BTRFS_BALANCE_ARGS_DRANGE)
 243                 printf(", drange=%llu..%llu",
 244                        (unsigned long long)args->pstart,
 245                        (unsigned long long)args->pend);
 246         if (args->flags & BTRFS_BALANCE_ARGS_VRANGE)
 247                 printf(", vrange=%llu..%llu",
 248                        (unsigned long long)args->vstart,
 249                        (unsigned long long)args->vend);
 250
 251         printf("\n");
 252 }
 253
 254 static void dump_ioctl_balance_args(struct btrfs_ioctl_balance_args *args)
 255 {
 256         printf("Dumping filters: flags 0x%llx, state 0x%llx, force is %s\n",
 257                (unsigned long long)args->flags, (unsigned long long)args->state,
 258                (args->flags & BTRFS_BALANCE_FORCE) ? "on" : "off");
 259         if (args->flags & BTRFS_BALANCE_DATA) {
 260                 printf("  DATA (flags 0x%llx): ",
 261                        (unsigned long long)args->data.flags);
 262                 dump_balance_args(&args->data);
 263         }
 264         if (args->flags & BTRFS_BALANCE_METADATA) {
 265                 printf("  METADATA (flags 0x%llx): ",
 266                        (unsigned long long)args->meta.flags);
 267                 dump_balance_args(&args->meta);
 268         }
 269         if (args->flags & BTRFS_BALANCE_SYSTEM) {
 270                 printf("  SYSTEM (flags 0x%llx): ",
 271                        (unsigned long long)args->sys.flags);
 272                 dump_balance_args(&args->sys);
 273         }
 274 }
 275
 276 static int do_balance_v1(int fd)
 277 {
 278         struct btrfs_ioctl_vol_args args;
 279         int ret;
 280
 281         memset(&args, 0, sizeof(args));
 282         ret = ioctl(fd, BTRFS_IOC_BALANCE, &args);
 283         return ret;
 284 }
 285
 286 static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
 287                       int nofilters)
 288 {
 289         int fd;
 290         int ret;
 291         int e;
 292
 293         fd = open_file_or_dir(path);
 294         if (fd < 0) {
 295                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 296                 return 12;
 297         }
 298
 299         ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, args);
 300         e = errno;
 301
 302         if (ret < 0) {
 303                 /*
 304                  * older kernels don't have the new balance ioctl, try the
 305                  * old one.  But, the old one doesn't know any filters, so
 306                  * don't fall back if they tried to use the fancy new things
 307                  */
 308                 if (e == ENOTTY && nofilters) {
 309                         ret = do_balance_v1(fd);
 310                         if (ret == 0)
 311                                 goto out;
 312                         e = errno;
 313                 }
 314
 315                 if (e == ECANCELED) {
 316                         if (args->state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 317                                 fprintf(stderr, "balance paused by user\n");
 318                         if (args->state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 319                                 fprintf(stderr, "balance canceled by user\n");
 320                         ret = 0;
 321                 } else {
 322                         fprintf(stderr, "ERROR: error during balancing '%s' "
 323                                 "- %s\n", path, strerror(e));
 324                         if (e != EINPROGRESS)
 325                                 fprintf(stderr, "There may be more info in "
 326                                         "syslog - try dmesg | tail\n");
 327                         ret = 19;
 328                 }
 329         } else {
 330                 printf("Done, had to relocate %llu out of %llu chunks\n",
 331                        (unsigned long long)args->stat.completed,
 332                        (unsigned long long)args->stat.considered);
 333                 ret = 0;
 334         }
 335
 336 out:
 337         close(fd);
 338         return ret;
 339 }
 340
 341 static const char * const cmd_balance_start_usage[] = {
 342         "btrfs [filesystem] balance start [options] <path>",
 343         "Balance chunks across the devices",
 344         "Balance and/or convert (change allocation profile of) chunks that",
 345         "passed all filters in a comma-separated list of filters for a",
 346         "particular chunk type.  If filter list is not given balance all",
 347         "chunks of that type.  In case none of the -d, -m or -s options is",
 348         "given balance all chunks in a filesystem.",
 349         "",
 350         "-d[filters]    act on data chunks",
 351         "-m[filters]    act on metadata chunks",
 352         "-s[filetrs]    act on system chunks (only under -f)",
 353         "-v             be verbose",
 354         "-f             force reducing of metadata integrity",
 355         NULL
 356 };
 357
 358 static int cmd_balance_start(int argc, char **argv)
 359 {
 360         struct btrfs_ioctl_balance_args args;
 361         struct btrfs_balance_args *ptrs[] = { &args.data, &args.sys,
 362                                                 &args.meta, NULL };
 363         int force = 0;
 364         int verbose = 0;
 365         int nofilters = 1;
 366         int i;
 367
 368         memset(&args, 0, sizeof(args));
 369
 370         optind = 1;
 371         while (1) {
 372                 int longindex;
 373                 static struct option longopts[] = {
 374                         { "data", optional_argument, NULL, 'd'},
 375                         { "metadata", optional_argument, NULL, 'm' },
 376                         { "system", optional_argument, NULL, 's' },
 377                         { "force", no_argument, NULL, 'f' },
 378                         { "verbose", no_argument, NULL, 'v' },
 379                         { 0, 0, 0, 0 }
 380                 };
 381
 382                 int opt = getopt_long(argc, argv, "d::s::m::fv", longopts,
 383                                       &longindex);
 384                 if (opt < 0)
 385                         break;
 386
 387                 switch (opt) {
 388                 case 'd':
 389                         nofilters = 0;
 390                         args.flags |= BTRFS_BALANCE_DATA;
 391
 392                         if (parse_filters(optarg, &args.data))
 393                                 return 1;
 394                         break;
 395                 case 's':
 396                         nofilters = 0;
 397                         args.flags |= BTRFS_BALANCE_SYSTEM;
 398
 399                         if (parse_filters(optarg, &args.sys))
 400                                 return 1;
 401                         break;
 402                 case 'm':
 403                         nofilters = 0;
 404                         args.flags |= BTRFS_BALANCE_METADATA;
 405
 406                         if (parse_filters(optarg, &args.meta))
 407                                 return 1;
 408                         break;
 409                 case 'f':
 410                         force = 1;
 411                         break;
 412                 case 'v':
 413                         verbose = 1;
 414                         break;
 415                 default:
 416                         usage(cmd_balance_start_usage);
 417                 }
 418         }
 419
 420         if (check_argc_exact(argc - optind, 1))
 421                 usage(cmd_balance_start_usage);
 422
 423         /*
 424          * allow -s only under --force, otherwise do with system chunks
 425          * the same thing we were ordered to do with meta chunks
 426          */
 427         if (args.flags & BTRFS_BALANCE_SYSTEM) {
 428                 if (!force) {
 429                         fprintf(stderr,
 430 "Refusing to explicitly operate on system chunks.\n"
 431 "Pass --force if you really want to do that.\n");
 432                         return 1;
 433                 }
 434         } else if (args.flags & BTRFS_BALANCE_METADATA) {
 435                 args.flags |= BTRFS_BALANCE_SYSTEM;
 436                 memcpy(&args.sys, &args.meta,
 437                         sizeof(struct btrfs_balance_args));
 438         }
 439
 440         if (nofilters) {
 441                 /* relocate everything - no filters */
 442                 args.flags |= BTRFS_BALANCE_TYPE_MASK;
 443         }
 444
 445         /* drange makes sense only when devid is set */
 446         for (i = 0; ptrs[i]; i++) {
 447                 if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
 448                     !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_DEVID)) {
 449                         fprintf(stderr, "drange filter can be used only if "
 450                                 "devid filter is used\n");
 451                         return 1;
 452                 }
 453         }
 454
 455         /* soft makes sense only when convert for corresponding type is set */
 456         for (i = 0; ptrs[i]; i++) {
 457                 if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_SOFT) &&
 458                     !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_CONVERT)) {
 459                         fprintf(stderr, "'soft' option can be used only if "
 460                                 "changing profiles\n");
 461                         return 1;
 462                 }
 463         }
 464
 465         if (force)
 466                 args.flags |= BTRFS_BALANCE_FORCE;
 467         if (verbose)
 468                 dump_ioctl_balance_args(&args);
 469
 470         return do_balance(argv[optind], &args, nofilters);
 471 }
 472
 473 static const char * const cmd_balance_pause_usage[] = {
 474         "btrfs [filesystem] balance pause <path>",
 475         "Pause running balance",
 476         NULL
 477 };
 478
 479 static int cmd_balance_pause(int argc, char **argv)
 480 {
 481         const char *path;
 482         int fd;
 483         int ret;
 484         int e;
 485
 486         if (check_argc_exact(argc, 2))
 487                 usage(cmd_balance_pause_usage);
 488
 489         path = argv[1];
 490
 491         fd = open_file_or_dir(path);
 492         if (fd < 0) {
 493                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 494                 return 12;
 495         }
 496
 497         ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
 498         e = errno;
 499         close(fd);
 500
 501         if (ret < 0) {
 502                 fprintf(stderr, "ERROR: balance pause on '%s' failed - %s\n",
 503                         path, (e == ENOTCONN) ? "Not running" : strerror(e));
 504                 return 19;
 505         }
 506
 507         return 0;
 508 }
 509
 510 static const char * const cmd_balance_cancel_usage[] = {
 511         "btrfs [filesystem] balance cancel <path>",
 512         "Cancel running or paused balance",
 513         NULL
 514 };
 515
 516 static int cmd_balance_cancel(int argc, char **argv)
 517 {
 518         const char *path;
 519         int fd;
 520         int ret;
 521         int e;
 522
 523         if (check_argc_exact(argc, 2))
 524                 usage(cmd_balance_cancel_usage);
 525
 526         path = argv[1];
 527
 528         fd = open_file_or_dir(path);
 529         if (fd < 0) {
 530                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 531                 return 12;
 532         }
 533
 534         ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
 535         e = errno;
 536         close(fd);
 537
 538         if (ret < 0) {
 539                 fprintf(stderr, "ERROR: balance cancel on '%s' failed - %s\n",
 540                         path, (e == ENOTCONN) ? "Not in progress" : strerror(e));
 541                 return 19;
 542         }
 543
 544         return 0;
 545 }
 546
 547 static const char * const cmd_balance_resume_usage[] = {
 548         "btrfs [filesystem] balance resume <path>",
 549         "Resume interrupted balance",
 550         NULL
 551 };
 552
 553 static int cmd_balance_resume(int argc, char **argv)
 554 {
 555         struct btrfs_ioctl_balance_args args;
 556         const char *path;
 557         int fd;
 558         int ret;
 559         int e;
 560
 561         if (check_argc_exact(argc, 2))
 562                 usage(cmd_balance_resume_usage);
 563
 564         path = argv[1];
 565
 566         fd = open_file_or_dir(path);
 567         if (fd < 0) {
 568                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 569                 return 12;
 570         }
 571
 572         memset(&args, 0, sizeof(args));
 573         args.flags |= BTRFS_BALANCE_RESUME;
 574
 575         ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, &args);
 576         e = errno;
 577         close(fd);
 578
 579         if (ret < 0) {
 580                 if (e == ECANCELED) {
 581                         if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 582                                 fprintf(stderr, "balance paused by user\n");
 583                         if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 584                                 fprintf(stderr, "balance canceled by user\n");
 585                 } else if (e == ENOTCONN || e == EINPROGRESS) {
 586                         fprintf(stderr, "ERROR: balance resume on '%s' "
 587                                 "failed - %s\n", path,
 588                                 (e == ENOTCONN) ? "Not in progress" :
 589                                                   "Already running");
 590                         return 19;
 591                 } else {
 592                         fprintf(stderr,
 593 "ERROR: error during balancing '%s' - %s\n"
 594 "There may be more info in syslog - try dmesg | tail\n", path, strerror(e));
 595                         return 19;
 596                 }
 597         } else {
 598                 printf("Done, had to relocate %llu out of %llu chunks\n",
 599                        (unsigned long long)args.stat.completed,
 600                        (unsigned long long)args.stat.considered);
 601         }
 602
 603         return 0;
 604 }
 605
 606 static const char * const cmd_balance_status_usage[] = {
 607         "btrfs [filesystem] balance status [-v] <path>",
 608         "Show status of running or paused balance",
 609         "",
 610         "-v     be verbose",
 611         NULL
 612 };
 613
 614 static int cmd_balance_status(int argc, char **argv)
 615 {
 616         struct btrfs_ioctl_balance_args args;
 617         const char *path;
 618         int fd;
 619         int verbose = 0;
 620         int ret;
 621         int e;
 622
 623         optind = 1;
 624         while (1) {
 625                 int longindex;
 626                 static struct option longopts[] = {
 627                         { "verbose", no_argument, NULL, 'v' },
 628                         { 0, 0, 0, 0}
 629                 };
 630
 631                 int opt = getopt_long(argc, argv, "v", longopts, &longindex);
 632                 if (opt < 0)
 633                         break;
 634
 635                 switch (opt) {
 636                 case 'v':
 637                         verbose = 1;
 638                         break;
 639                 default:
 640                         usage(cmd_balance_status_usage);
 641                 }
 642         }
 643
 644         if (check_argc_exact(argc - optind, 1))
 645                 usage(cmd_balance_status_usage);
 646
 647         path = argv[optind];
 648
 649         fd = open_file_or_dir(path);
 650         if (fd < 0) {
 651                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 652                 return 12;
 653         }
 654
 655         ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
 656         e = errno;
 657         close(fd);
 658
 659         if (ret < 0) {
 660                 fprintf(stderr, "ERROR: balance status on '%s' failed - %s\n",
 661                         path, (e == ENOTCONN) ? "Not in progress" : strerror(e));
 662                 return 19;
 663         }
 664
 665         if (args.state & BTRFS_BALANCE_STATE_RUNNING) {
 666                 printf("Balance on '%s' is running", path);
 667                 if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 668                         printf(", cancel requested\n");
 669                 else if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 670                         printf(", pause requested\n");
 671                 else
 672                         printf("\n");
 673         } else {
 674                 printf("Balance on '%s' is paused\n", path);
 675         }
 676
 677         printf("%llu out of about %llu chunks balanced (%llu considered), "
 678                "%3.f%% left\n", (unsigned long long)args.stat.completed,
 679                (unsigned long long)args.stat.expected,
 680                (unsigned long long)args.stat.considered,
 681                100 * (1 - (float)args.stat.completed/args.stat.expected));
 682
 683         if (verbose)
 684                 dump_ioctl_balance_args(&args);
 685
 686         return 0;
 687 }
 688
 689 const struct cmd_group balance_cmd_group = {
 690         balance_cmd_group_usage, balance_cmd_group_info, {
 691                 { "start", cmd_balance_start, cmd_balance_start_usage, NULL, 0 },
 692                 { "pause", cmd_balance_pause, cmd_balance_pause_usage, NULL, 0 },
 693                 { "cancel", cmd_balance_cancel, cmd_balance_cancel_usage, NULL, 0 },
 694                 { "resume", cmd_balance_resume, cmd_balance_resume_usage, NULL, 0 },
 695                 { "status", cmd_balance_status, cmd_balance_status_usage, NULL, 0 },
 696                 { 0, 0, 0, 0, 0 }
 697         }
 698 };
 699
 700 int cmd_balance(int argc, char **argv)
 701 {
 702         if (argc == 2) {
 703                 /* old 'btrfs filesystem balance <path>' syntax */
 704                 struct btrfs_ioctl_balance_args args;
 705
 706                 memset(&args, 0, sizeof(args));
 707                 args.flags |= BTRFS_BALANCE_TYPE_MASK;
 708
 709                 return do_balance(argv[1], &args, 1);
 710         }
 711
 712         return handle_command_group(&balance_cmd_group, argc, argv);
 713 }