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 #include "utils.h"
  32
  33 static const char * const balance_cmd_group_usage[] = {
  34         "btrfs [filesystem] balance <command> [options] <path>",
  35         "btrfs [filesystem] balance <path>",
  36         NULL
  37 };
  38
  39 static const char balance_cmd_group_info[] =
  40         "'btrfs filesystem balance' command is deprecated, please use\n"
  41         "'btrfs balance start' command instead.";
  42
  43 static int parse_one_profile(const char *profile, u64 *flags)
  44 {
  45         if (!strcmp(profile, "raid0")) {
  46                 *flags |= BTRFS_BLOCK_GROUP_RAID0;
  47         } else if (!strcmp(profile, "raid1")) {
  48                 *flags |= BTRFS_BLOCK_GROUP_RAID1;
  49         } else if (!strcmp(profile, "raid10")) {
  50                 *flags |= BTRFS_BLOCK_GROUP_RAID10;
  51         } else if (!strcmp(profile, "raid5")) {
  52                 *flags |= BTRFS_BLOCK_GROUP_RAID5;
  53         } else if (!strcmp(profile, "raid6")) {
  54                 *flags |= BTRFS_BLOCK_GROUP_RAID6;
  55         } else if (!strcmp(profile, "dup")) {
  56                 *flags |= BTRFS_BLOCK_GROUP_DUP;
  57         } else if (!strcmp(profile, "single")) {
  58                 *flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
  59         } else {
  60                 fprintf(stderr, "Unknown profile '%s'\n", profile);
  61                 return 1;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int parse_profiles(char *profiles, u64 *flags)
  68 {
  69         char *this_char;
  70         char *save_ptr = NULL; /* Satisfy static checkers */
  71
  72         for (this_char = strtok_r(profiles, "|", &save_ptr);
  73              this_char != NULL;
  74              this_char = strtok_r(NULL, "|", &save_ptr)) {
  75                 if (parse_one_profile(this_char, flags))
  76                         return 1;
  77         }
  78
  79         return 0;
  80 }
  81
  82 static int parse_u64(const char *str, u64 *result)
  83 {
  84         char *endptr;
  85         u64 val;
  86
  87         val = strtoull(str, &endptr, 10);
  88         if (*endptr)
  89                 return 1;
  90
  91         *result = val;
  92         return 0;
  93 }
  94
  95 static int parse_range(const char *range, u64 *start, u64 *end)
  96 {
  97         char *dots;
  98
  99         dots = strstr(range, "..");
 100         if (dots) {
 101                 const char *rest = dots + 2;
 102                 int skipped = 0;
 103
 104                 *dots = 0;
 105
 106                 if (!*rest) {
 107                         *end = (u64)-1;
 108                         skipped++;
 109                 } else {
 110                         if (parse_u64(rest, end))
 111                                 return 1;
 112                 }
 113                 if (dots == range) {
 114                         *start = 0;
 115                         skipped++;
 116                 } else {
 117                         if (parse_u64(range, start))
 118                                 return 1;
 119                 }
 120
 121                 if (*start >= *end) {
 122                         fprintf(stderr, "Range %llu..%llu doesn't make "
 123                                 "sense\n", (unsigned long long)*start,
 124                                 (unsigned long long)*end);
 125                         return 1;
 126                 }
 127
 128                 if (skipped <= 1)
 129                         return 0;
 130         }
 131
 132         return 1;
 133 }
 134
 135 static int parse_filters(char *filters, struct btrfs_balance_args *args)
 136 {
 137         char *this_char;
 138         char *value;
 139         char *save_ptr = NULL; /* Satisfy static checkers */
 140
 141         if (!filters)
 142                 return 0;
 143
 144         for (this_char = strtok_r(filters, ",", &save_ptr);
 145              this_char != NULL;
 146              this_char = strtok_r(NULL, ",", &save_ptr)) {
 147                 if ((value = strchr(this_char, '=')) != NULL)
 148                         *value++ = 0;
 149                 if (!strcmp(this_char, "profiles")) {
 150                         if (!value || !*value) {
 151                                 fprintf(stderr, "the profiles filter requires "
 152                                        "an argument\n");
 153                                 return 1;
 154                         }
 155                         if (parse_profiles(value, &args->profiles)) {
 156                                 fprintf(stderr, "Invalid profiles argument\n");
 157                                 return 1;
 158                         }
 159                         args->flags |= BTRFS_BALANCE_ARGS_PROFILES;
 160                 } else if (!strcmp(this_char, "usage")) {
 161                         if (!value || !*value) {
 162                                 fprintf(stderr, "the usage filter requires "
 163                                        "an argument\n");
 164                                 return 1;
 165                         }
 166                         if (parse_u64(value, &args->usage) ||
 167                             args->usage > 100) {
 168                                 fprintf(stderr, "Invalid usage argument: %s\n",
 169                                        value);
 170                                 return 1;
 171                         }
 172                         args->flags |= BTRFS_BALANCE_ARGS_USAGE;
 173                 } else if (!strcmp(this_char, "devid")) {
 174                         if (!value || !*value) {
 175                                 fprintf(stderr, "the devid filter requires "
 176                                        "an argument\n");
 177                                 return 1;
 178                         }
 179                         if (parse_u64(value, &args->devid) ||
 180                             args->devid == 0) {
 181                                 fprintf(stderr, "Invalid devid argument: %s\n",
 182                                        value);
 183                                 return 1;
 184                         }
 185                         args->flags |= BTRFS_BALANCE_ARGS_DEVID;
 186                 } else if (!strcmp(this_char, "drange")) {
 187                         if (!value || !*value) {
 188                                 fprintf(stderr, "the drange filter requires "
 189                                        "an argument\n");
 190                                 return 1;
 191                         }
 192                         if (parse_range(value, &args->pstart, &args->pend)) {
 193                                 fprintf(stderr, "Invalid drange argument\n");
 194                                 return 1;
 195                         }
 196                         args->flags |= BTRFS_BALANCE_ARGS_DRANGE;
 197                 } else if (!strcmp(this_char, "vrange")) {
 198                         if (!value || !*value) {
 199                                 fprintf(stderr, "the vrange filter requires "
 200                                        "an argument\n");
 201                                 return 1;
 202                         }
 203                         if (parse_range(value, &args->vstart, &args->vend)) {
 204                                 fprintf(stderr, "Invalid vrange argument\n");
 205                                 return 1;
 206                         }
 207                         args->flags |= BTRFS_BALANCE_ARGS_VRANGE;
 208                 } else if (!strcmp(this_char, "convert")) {
 209                         if (!value || !*value) {
 210                                 fprintf(stderr, "the convert option requires "
 211                                        "an argument\n");
 212                                 return 1;
 213                         }
 214                         if (parse_one_profile(value, &args->target)) {
 215                                 fprintf(stderr, "Invalid convert argument\n");
 216                                 return 1;
 217                         }
 218                         args->flags |= BTRFS_BALANCE_ARGS_CONVERT;
 219                 } else if (!strcmp(this_char, "soft")) {
 220                         args->flags |= BTRFS_BALANCE_ARGS_SOFT;
 221                 } else {
 222                         fprintf(stderr, "Unrecognized balance option '%s'\n",
 223                                 this_char);
 224                         return 1;
 225                 }
 226         }
 227
 228         return 0;
 229 }
 230
 231 static void dump_balance_args(struct btrfs_balance_args *args)
 232 {
 233         if (args->flags & BTRFS_BALANCE_ARGS_CONVERT) {
 234                 printf("converting, target=%llu, soft is %s",
 235                        (unsigned long long)args->target,
 236                        (args->flags & BTRFS_BALANCE_ARGS_SOFT) ? "on" : "off");
 237         } else {
 238                 printf("balancing");
 239         }
 240
 241         if (args->flags & BTRFS_BALANCE_ARGS_PROFILES)
 242                 printf(", profiles=%llu", (unsigned long long)args->profiles);
 243         if (args->flags & BTRFS_BALANCE_ARGS_USAGE)
 244                 printf(", usage=%llu", (unsigned long long)args->usage);
 245         if (args->flags & BTRFS_BALANCE_ARGS_DEVID)
 246                 printf(", devid=%llu", (unsigned long long)args->devid);
 247         if (args->flags & BTRFS_BALANCE_ARGS_DRANGE)
 248                 printf(", drange=%llu..%llu",
 249                        (unsigned long long)args->pstart,
 250                        (unsigned long long)args->pend);
 251         if (args->flags & BTRFS_BALANCE_ARGS_VRANGE)
 252                 printf(", vrange=%llu..%llu",
 253                        (unsigned long long)args->vstart,
 254                        (unsigned long long)args->vend);
 255
 256         printf("\n");
 257 }
 258
 259 static void dump_ioctl_balance_args(struct btrfs_ioctl_balance_args *args)
 260 {
 261         printf("Dumping filters: flags 0x%llx, state 0x%llx, force is %s\n",
 262                (unsigned long long)args->flags, (unsigned long long)args->state,
 263                (args->flags & BTRFS_BALANCE_FORCE) ? "on" : "off");
 264         if (args->flags & BTRFS_BALANCE_DATA) {
 265                 printf("  DATA (flags 0x%llx): ",
 266                        (unsigned long long)args->data.flags);
 267                 dump_balance_args(&args->data);
 268         }
 269         if (args->flags & BTRFS_BALANCE_METADATA) {
 270                 printf("  METADATA (flags 0x%llx): ",
 271                        (unsigned long long)args->meta.flags);
 272                 dump_balance_args(&args->meta);
 273         }
 274         if (args->flags & BTRFS_BALANCE_SYSTEM) {
 275                 printf("  SYSTEM (flags 0x%llx): ",
 276                        (unsigned long long)args->sys.flags);
 277                 dump_balance_args(&args->sys);
 278         }
 279 }
 280
 281 static int do_balance_v1(int fd)
 282 {
 283         struct btrfs_ioctl_vol_args args;
 284         int ret;
 285
 286         memset(&args, 0, sizeof(args));
 287         ret = ioctl(fd, BTRFS_IOC_BALANCE, &args);
 288         return ret;
 289 }
 290
 291 static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
 292                       int nofilters)
 293 {
 294         int fd;
 295         int ret;
 296         int e;
 297         DIR *dirstream = NULL;
 298
 299         fd = open_file_or_dir(path, &dirstream);
 300         if (fd < 0) {
 301                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 302                 return 1;
 303         }
 304
 305         ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, args);
 306         e = errno;
 307
 308         if (ret < 0) {
 309                 /*
 310                  * older kernels don't have the new balance ioctl, try the
 311                  * old one.  But, the old one doesn't know any filters, so
 312                  * don't fall back if they tried to use the fancy new things
 313                  */
 314                 if (e == ENOTTY && nofilters) {
 315                         ret = do_balance_v1(fd);
 316                         if (ret == 0)
 317                                 goto out;
 318                         e = errno;
 319                 }
 320
 321                 if (e == ECANCELED) {
 322                         if (args->state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 323                                 fprintf(stderr, "balance paused by user\n");
 324                         if (args->state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 325                                 fprintf(stderr, "balance canceled by user\n");
 326                         ret = 0;
 327                 } else {
 328                         fprintf(stderr, "ERROR: error during balancing '%s' "
 329                                 "- %s\n", path, strerror(e));
 330                         if (e != EINPROGRESS)
 331                                 fprintf(stderr, "There may be more info in "
 332                                         "syslog - try dmesg | tail\n");
 333                         ret = 1;
 334                 }
 335         } else {
 336                 printf("Done, had to relocate %llu out of %llu chunks\n",
 337                        (unsigned long long)args->stat.completed,
 338                        (unsigned long long)args->stat.considered);
 339                 ret = 0;
 340         }
 341
 342 out:
 343         close_file_or_dir(fd, dirstream);
 344         return ret;
 345 }
 346
 347 static const char * const cmd_balance_start_usage[] = {
 348         "btrfs [filesystem] balance start [options] <path>",
 349         "Balance chunks across the devices",
 350         "Balance and/or convert (change allocation profile of) chunks that",
 351         "passed all filters in a comma-separated list of filters for a",
 352         "particular chunk type.  If filter list is not given balance all",
 353         "chunks of that type.  In case none of the -d, -m or -s options is",
 354         "given balance all chunks in a filesystem.",
 355         "",
 356         "-d[filters]    act on data chunks",
 357         "-m[filters]    act on metadata chunks",
 358         "-s[filters]    act on system chunks (only under -f)",
 359         "-v             be verbose",
 360         "-f             force reducing of metadata integrity",
 361         NULL
 362 };
 363
 364 static int cmd_balance_start(int argc, char **argv)
 365 {
 366         struct btrfs_ioctl_balance_args args;
 367         struct btrfs_balance_args *ptrs[] = { &args.data, &args.sys,
 368                                                 &args.meta, NULL };
 369         int force = 0;
 370         int verbose = 0;
 371         int nofilters = 1;
 372         int i;
 373
 374         memset(&args, 0, sizeof(args));
 375
 376         optind = 1;
 377         while (1) {
 378                 int longindex;
 379                 static struct option longopts[] = {
 380                         { "data", optional_argument, NULL, 'd'},
 381                         { "metadata", optional_argument, NULL, 'm' },
 382                         { "system", optional_argument, NULL, 's' },
 383                         { "force", no_argument, NULL, 'f' },
 384                         { "verbose", no_argument, NULL, 'v' },
 385                         { NULL, no_argument, NULL, 0 },
 386                 };
 387
 388                 int opt = getopt_long(argc, argv, "d::s::m::fv", longopts,
 389                                       &longindex);
 390                 if (opt < 0)
 391                         break;
 392
 393                 switch (opt) {
 394                 case 'd':
 395                         nofilters = 0;
 396                         args.flags |= BTRFS_BALANCE_DATA;
 397
 398                         if (parse_filters(optarg, &args.data))
 399                                 return 1;
 400                         break;
 401                 case 's':
 402                         nofilters = 0;
 403                         args.flags |= BTRFS_BALANCE_SYSTEM;
 404
 405                         if (parse_filters(optarg, &args.sys))
 406                                 return 1;
 407                         break;
 408                 case 'm':
 409                         nofilters = 0;
 410                         args.flags |= BTRFS_BALANCE_METADATA;
 411
 412                         if (parse_filters(optarg, &args.meta))
 413                                 return 1;
 414                         break;
 415                 case 'f':
 416                         force = 1;
 417                         break;
 418                 case 'v':
 419                         verbose = 1;
 420                         break;
 421                 default:
 422                         usage(cmd_balance_start_usage);
 423                 }
 424         }
 425
 426         if (check_argc_exact(argc - optind, 1))
 427                 usage(cmd_balance_start_usage);
 428
 429         /*
 430          * allow -s only under --force, otherwise do with system chunks
 431          * the same thing we were ordered to do with meta chunks
 432          */
 433         if (args.flags & BTRFS_BALANCE_SYSTEM) {
 434                 if (!force) {
 435                         fprintf(stderr,
 436 "Refusing to explicitly operate on system chunks.\n"
 437 "Pass --force if you really want to do that.\n");
 438                         return 1;
 439                 }
 440         } else if (args.flags & BTRFS_BALANCE_METADATA) {
 441                 args.flags |= BTRFS_BALANCE_SYSTEM;
 442                 memcpy(&args.sys, &args.meta,
 443                         sizeof(struct btrfs_balance_args));
 444         }
 445
 446         if (nofilters) {
 447                 /* relocate everything - no filters */
 448                 args.flags |= BTRFS_BALANCE_TYPE_MASK;
 449         }
 450
 451         /* drange makes sense only when devid is set */
 452         for (i = 0; ptrs[i]; i++) {
 453                 if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
 454                     !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_DEVID)) {
 455                         fprintf(stderr, "drange filter can be used only if "
 456                                 "devid filter is used\n");
 457                         return 1;
 458                 }
 459         }
 460
 461         /* soft makes sense only when convert for corresponding type is set */
 462         for (i = 0; ptrs[i]; i++) {
 463                 if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_SOFT) &&
 464                     !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_CONVERT)) {
 465                         fprintf(stderr, "'soft' option can be used only if "
 466                                 "changing profiles\n");
 467                         return 1;
 468                 }
 469         }
 470
 471         if (force)
 472                 args.flags |= BTRFS_BALANCE_FORCE;
 473         if (verbose)
 474                 dump_ioctl_balance_args(&args);
 475
 476         return do_balance(argv[optind], &args, nofilters);
 477 }
 478
 479 static const char * const cmd_balance_pause_usage[] = {
 480         "btrfs [filesystem] balance pause <path>",
 481         "Pause running balance",
 482         NULL
 483 };
 484
 485 static int cmd_balance_pause(int argc, char **argv)
 486 {
 487         const char *path;
 488         int fd;
 489         int ret;
 490         int e;
 491         DIR *dirstream = NULL;
 492
 493         if (check_argc_exact(argc, 2))
 494                 usage(cmd_balance_pause_usage);
 495
 496         path = argv[1];
 497
 498         fd = open_file_or_dir(path, &dirstream);
 499         if (fd < 0) {
 500                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 501                 return 1;
 502         }
 503
 504         ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
 505         e = errno;
 506         close_file_or_dir(fd, dirstream);
 507
 508         if (ret < 0) {
 509                 fprintf(stderr, "ERROR: balance pause on '%s' failed - %s\n",
 510                         path, (e == ENOTCONN) ? "Not running" : strerror(e));
 511                 if (e == ENOTCONN)
 512                         return 2;
 513                 else
 514                         return 1;
 515         }
 516
 517         return 0;
 518 }
 519
 520 static const char * const cmd_balance_cancel_usage[] = {
 521         "btrfs [filesystem] balance cancel <path>",
 522         "Cancel running or paused balance",
 523         NULL
 524 };
 525
 526 static int cmd_balance_cancel(int argc, char **argv)
 527 {
 528         const char *path;
 529         int fd;
 530         int ret;
 531         int e;
 532         DIR *dirstream = NULL;
 533
 534         if (check_argc_exact(argc, 2))
 535                 usage(cmd_balance_cancel_usage);
 536
 537         path = argv[1];
 538
 539         fd = open_file_or_dir(path, &dirstream);
 540         if (fd < 0) {
 541                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 542                 return 1;
 543         }
 544
 545         ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
 546         e = errno;
 547         close_file_or_dir(fd, dirstream);
 548
 549         if (ret < 0) {
 550                 fprintf(stderr, "ERROR: balance cancel on '%s' failed - %s\n",
 551                         path, (e == ENOTCONN) ? "Not in progress" : strerror(e));
 552                 if (e == ENOTCONN)
 553                         return 2;
 554                 else
 555                         return 1;
 556         }
 557
 558         return 0;
 559 }
 560
 561 static const char * const cmd_balance_resume_usage[] = {
 562         "btrfs [filesystem] balance resume <path>",
 563         "Resume interrupted balance",
 564         NULL
 565 };
 566
 567 static int cmd_balance_resume(int argc, char **argv)
 568 {
 569         struct btrfs_ioctl_balance_args args;
 570         const char *path;
 571         DIR *dirstream = NULL;
 572         int fd;
 573         int ret;
 574         int e;
 575
 576         if (check_argc_exact(argc, 2))
 577                 usage(cmd_balance_resume_usage);
 578
 579         path = argv[1];
 580
 581         fd = open_file_or_dir(path, &dirstream);
 582         if (fd < 0) {
 583                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 584                 return 1;
 585         }
 586
 587         memset(&args, 0, sizeof(args));
 588         args.flags |= BTRFS_BALANCE_RESUME;
 589
 590         ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, &args);
 591         e = errno;
 592         close_file_or_dir(fd, dirstream);
 593
 594         if (ret < 0) {
 595                 if (e == ECANCELED) {
 596                         if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 597                                 fprintf(stderr, "balance paused by user\n");
 598                         if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 599                                 fprintf(stderr, "balance canceled by user\n");
 600                 } else if (e == ENOTCONN || e == EINPROGRESS) {
 601                         fprintf(stderr, "ERROR: balance resume on '%s' "
 602                                 "failed - %s\n", path,
 603                                 (e == ENOTCONN) ? "Not in progress" :
 604                                                   "Already running");
 605                         if (e == ENOTCONN)
 606                                 return 2;
 607                         else
 608                                 return 1;
 609                 } else {
 610                         fprintf(stderr,
 611 "ERROR: error during balancing '%s' - %s\n"
 612 "There may be more info in syslog - try dmesg | tail\n", path, strerror(e));
 613                         return 1;
 614                 }
 615         } else {
 616                 printf("Done, had to relocate %llu out of %llu chunks\n",
 617                        (unsigned long long)args.stat.completed,
 618                        (unsigned long long)args.stat.considered);
 619         }
 620
 621         return 0;
 622 }
 623
 624 static const char * const cmd_balance_status_usage[] = {
 625         "btrfs [filesystem] balance status [-v] <path>",
 626         "Show status of running or paused balance",
 627         "",
 628         "-v     be verbose",
 629         NULL
 630 };
 631
 632 /* Checks the status of the balance if any
 633  * return codes:
 634  *   2 : Error failed to know if there is any pending balance
 635  *   1 : Successful to know status of a pending balance
 636  *   0 : When there is no pending balance or completed
 637  */
 638 static int cmd_balance_status(int argc, char **argv)
 639 {
 640         struct btrfs_ioctl_balance_args args;
 641         const char *path;
 642         DIR *dirstream = NULL;
 643         int fd;
 644         int verbose = 0;
 645         int ret;
 646         int e;
 647
 648         optind = 1;
 649         while (1) {
 650                 int longindex;
 651                 static struct option longopts[] = {
 652                         { "verbose", no_argument, NULL, 'v' },
 653                         { NULL, no_argument, NULL, 0}
 654                 };
 655
 656                 int opt = getopt_long(argc, argv, "v", longopts, &longindex);
 657                 if (opt < 0)
 658                         break;
 659
 660                 switch (opt) {
 661                 case 'v':
 662                         verbose = 1;
 663                         break;
 664                 default:
 665                         usage(cmd_balance_status_usage);
 666                 }
 667         }
 668
 669         if (check_argc_exact(argc - optind, 1))
 670                 usage(cmd_balance_status_usage);
 671
 672         path = argv[optind];
 673
 674         fd = open_file_or_dir(path, &dirstream);
 675         if (fd < 0) {
 676                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 677                 return 2;
 678         }
 679
 680         ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
 681         e = errno;
 682         close_file_or_dir(fd, dirstream);
 683
 684         if (ret < 0) {
 685                 if (e == ENOTCONN) {
 686                         printf("No balance found on '%s'\n", path);
 687                         return 0;
 688                 }
 689                 fprintf(stderr, "ERROR: balance status on '%s' failed - %s\n",
 690                         path, strerror(e));
 691                 return 2;
 692         }
 693
 694         if (args.state & BTRFS_BALANCE_STATE_RUNNING) {
 695                 printf("Balance on '%s' is running", path);
 696                 if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 697                         printf(", cancel requested\n");
 698                 else if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 699                         printf(", pause requested\n");
 700                 else
 701                         printf("\n");
 702         } else {
 703                 printf("Balance on '%s' is paused\n", path);
 704         }
 705
 706         printf("%llu out of about %llu chunks balanced (%llu considered), "
 707                "%3.f%% left\n", (unsigned long long)args.stat.completed,
 708                (unsigned long long)args.stat.expected,
 709                (unsigned long long)args.stat.considered,
 710                100 * (1 - (float)args.stat.completed/args.stat.expected));
 711
 712         if (verbose)
 713                 dump_ioctl_balance_args(&args);
 714
 715         return 1;
 716 }
 717
 718 const struct cmd_group balance_cmd_group = {
 719         balance_cmd_group_usage, balance_cmd_group_info, {
 720                 { "start", cmd_balance_start, cmd_balance_start_usage, NULL, 0 },
 721                 { "pause", cmd_balance_pause, cmd_balance_pause_usage, NULL, 0 },
 722                 { "cancel", cmd_balance_cancel, cmd_balance_cancel_usage, NULL, 0 },
 723                 { "resume", cmd_balance_resume, cmd_balance_resume_usage, NULL, 0 },
 724                 { "status", cmd_balance_status, cmd_balance_status_usage, NULL, 0 },
 725                 NULL_CMD_STRUCT
 726         }
 727 };
 728
 729 int cmd_balance(int argc, char **argv)
 730 {
 731         if (argc == 2) {
 732                 /* old 'btrfs filesystem balance <path>' syntax */
 733                 struct btrfs_ioctl_balance_args args;
 734
 735                 memset(&args, 0, sizeof(args));
 736                 args.flags |= BTRFS_BALANCE_TYPE_MASK;
 737
 738                 return do_balance(argv[1], &args, 1);
 739         }
 740
 741         return handle_command_group(&balance_cmd_group, argc, argv);
 742 }