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