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 balance <command> [options] <path>",
  35         "btrfs balance <path>",
  36         NULL
  37 };
  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, "raid5")) {
  48                 *flags |= BTRFS_BLOCK_GROUP_RAID5;
  49         } else if (!strcmp(profile, "raid6")) {
  50                 *flags |= BTRFS_BLOCK_GROUP_RAID6;
  51         } else if (!strcmp(profile, "dup")) {
  52                 *flags |= BTRFS_BLOCK_GROUP_DUP;
  53         } else if (!strcmp(profile, "single")) {
  54                 *flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
  55         } else {
  56                 error("unknown profile: %s", profile);
  57                 return 1;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static int parse_profiles(char *profiles, u64 *flags)
  64 {
  65         char *this_char;
  66         char *save_ptr = NULL; /* Satisfy static checkers */
  67
  68         for (this_char = strtok_r(profiles, "|", &save_ptr);
  69              this_char != NULL;
  70              this_char = strtok_r(NULL, "|", &save_ptr)) {
  71                 if (parse_one_profile(this_char, flags))
  72                         return 1;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int parse_u64(const char *str, u64 *result)
  79 {
  80         char *endptr;
  81         u64 val;
  82
  83         val = strtoull(str, &endptr, 10);
  84         if (*endptr)
  85                 return 1;
  86
  87         *result = val;
  88         return 0;
  89 }
  90
  91 /*
  92  * Parse range that's missing some part that can be implicit:
  93  * a..b - exact range, a can be equal to b
  94  * a..  - implicitly unbounded maximum (end == (u64)-1)
  95  * ..b  - implicitly starting at 0
  96  * a    - invalid; unclear semantics, use parse_u64 instead
  97  *
  98  * Returned values are u64, value validation and interpretation should be done
  99  * by the caller.
 100  */
 101 static int parse_range(const char *range, u64 *start, u64 *end)
 102 {
 103         char *dots;
 104         char *endptr;
 105         const char *rest;
 106         int skipped = 0;
 107
 108         dots = strstr(range, "..");
 109         if (!dots)
 110                 return 1;
 111
 112         rest = dots + 2;
 113
 114         if (!*rest) {
 115                 *end = (u64)-1;
 116                 skipped++;
 117         } else {
 118                 *end = strtoull(rest, &endptr, 10);
 119                 if (*endptr)
 120                         return 1;
 121         }
 122         if (dots == range) {
 123                 *start = 0;
 124                 skipped++;
 125         } else {
 126                 *start = strtoull(range, &endptr, 10);
 127                 if (*endptr != 0 && *endptr != '.')
 128                         return 1;
 129         }
 130
 131         if (*start > *end) {
 132                 error("range %llu..%llu doesn't make sense",
 133                         (unsigned long long)*start,
 134                         (unsigned long long)*end);
 135                 return 1;
 136         }
 137
 138         if (skipped <= 1)
 139                 return 0;
 140
 141         return 1;
 142 }
 143
 144 /*
 145  * Parse range and check if start < end
 146  */
 147 static int parse_range_strict(const char *range, u64 *start, u64 *end)
 148 {
 149         if (parse_range(range, start, end) == 0) {
 150                 if (*start >= *end) {
 151                         error("range %llu..%llu not allowed",
 152                                 (unsigned long long)*start,
 153                                 (unsigned long long)*end);
 154                         return 1;
 155                 }
 156                 return 0;
 157         }
 158
 159         return 1;
 160 }
 161
 162 /*
 163  * Convert 64bit range to 32bit with boundary checkso
 164  */
 165 static int range_to_u32(u64 start, u64 end, u32 *start32, u32 *end32)
 166 {
 167         if (start > (u32)-1)
 168                 return 1;
 169
 170         if (end != (u64)-1 && end > (u32)-1)
 171                 return 1;
 172
 173         *start32 = (u32)start;
 174         *end32 = (u32)end;
 175
 176         return 0;
 177 }
 178
 179 __attribute__ ((unused))
 180 static int parse_range_u32(const char *range, u32 *start, u32 *end)
 181 {
 182         u64 tmp_start;
 183         u64 tmp_end;
 184
 185         if (parse_range(range, &tmp_start, &tmp_end))
 186                 return 1;
 187
 188         if (range_to_u32(tmp_start, tmp_end, start, end))
 189                 return 1;
 190
 191         return 0;
 192 }
 193
 194 __attribute__ ((unused))
 195 static void print_range(u64 start, u64 end)
 196 {
 197         if (start)
 198                 printf("%llu", (unsigned long long)start);
 199         printf("..");
 200         if (end != (u64)-1)
 201                 printf("%llu", (unsigned long long)end);
 202 }
 203
 204 __attribute__ ((unused))
 205 static void print_range_u32(u32 start, u32 end)
 206 {
 207         if (start)
 208                 printf("%u", start);
 209         printf("..");
 210         if (end != (u32)-1)
 211                 printf("%u", end);
 212 }
 213
 214 static int parse_filters(char *filters, struct btrfs_balance_args *args)
 215 {
 216         char *this_char;
 217         char *value;
 218         char *save_ptr = NULL; /* Satisfy static checkers */
 219
 220         if (!filters)
 221                 return 0;
 222
 223         for (this_char = strtok_r(filters, ",", &save_ptr);
 224              this_char != NULL;
 225              this_char = strtok_r(NULL, ",", &save_ptr)) {
 226                 if ((value = strchr(this_char, '=')) != NULL)
 227                         *value++ = 0;
 228                 if (!strcmp(this_char, "profiles")) {
 229                         if (!value || !*value) {
 230                                 error("the profiles filter requires an argument");
 231                                 return 1;
 232                         }
 233                         if (parse_profiles(value, &args->profiles)) {
 234                                 error("invalid profiles argument");
 235                                 return 1;
 236                         }
 237                         args->flags |= BTRFS_BALANCE_ARGS_PROFILES;
 238                 } else if (!strcmp(this_char, "usage")) {
 239                         if (!value || !*value) {
 240                                 error("the usage filter requires an argument");
 241                                 return 1;
 242                         }
 243                         if (parse_u64(value, &args->usage)) {
 244                                 if (parse_range_u32(value, &args->usage_min,
 245                                                         &args->usage_max)) {
 246                                         error("invalid usage argument: %s",
 247                                                 value);
 248                                         return 1;
 249                                 }
 250                                 if (args->usage_max > 100) {
 251                                         error("invalid usage argument: %s",
 252                                                 value);
 253                                 }
 254                                 args->flags &= ~BTRFS_BALANCE_ARGS_USAGE;
 255                                 args->flags |= BTRFS_BALANCE_ARGS_USAGE_RANGE;
 256                         } else {
 257                                 if (args->usage > 100) {
 258                                         error("invalid usage argument: %s",
 259                                                 value);
 260                                         return 1;
 261                                 }
 262                                 args->flags &= ~BTRFS_BALANCE_ARGS_USAGE_RANGE;
 263                                 args->flags |= BTRFS_BALANCE_ARGS_USAGE;
 264                         }
 265                         args->flags |= BTRFS_BALANCE_ARGS_USAGE;
 266                 } else if (!strcmp(this_char, "devid")) {
 267                         if (!value || !*value) {
 268                                 error("the devid filter requires an argument");
 269                                 return 1;
 270                         }
 271                         if (parse_u64(value, &args->devid) || args->devid == 0) {
 272                                 error("invalid devid argument: %s", value);
 273                                 return 1;
 274                         }
 275                         args->flags |= BTRFS_BALANCE_ARGS_DEVID;
 276                 } else if (!strcmp(this_char, "drange")) {
 277                         if (!value || !*value) {
 278                                 error("the drange filter requires an argument");
 279                                 return 1;
 280                         }
 281                         if (parse_range_strict(value, &args->pstart, &args->pend)) {
 282                                 error("invalid drange argument");
 283                                 return 1;
 284                         }
 285                         args->flags |= BTRFS_BALANCE_ARGS_DRANGE;
 286                 } else if (!strcmp(this_char, "vrange")) {
 287                         if (!value || !*value) {
 288                                 error("the vrange filter requires an argument");
 289                                 return 1;
 290                         }
 291                         if (parse_range_strict(value, &args->vstart, &args->vend)) {
 292                                 error("invalid vrange argument");
 293                                 return 1;
 294                         }
 295                         args->flags |= BTRFS_BALANCE_ARGS_VRANGE;
 296                 } else if (!strcmp(this_char, "convert")) {
 297                         if (!value || !*value) {
 298                                 error("the convert option requires an argument");
 299                                 return 1;
 300                         }
 301                         if (parse_one_profile(value, &args->target)) {
 302                                 error("invalid convert argument");
 303                                 return 1;
 304                         }
 305                         args->flags |= BTRFS_BALANCE_ARGS_CONVERT;
 306                 } else if (!strcmp(this_char, "soft")) {
 307                         args->flags |= BTRFS_BALANCE_ARGS_SOFT;
 308                 } else if (!strcmp(this_char, "limit")) {
 309                         if (!value || !*value) {
 310                                 error("the limit filter requires an argument");
 311                                 return 1;
 312                         }
 313                         if (parse_u64(value, &args->limit)) {
 314                                 if (parse_range_u32(value, &args->limit_min,
 315                                                         &args->limit_max)) {
 316                                         error("Invalid limit argument: %s",
 317                                                value);
 318                                         return 1;
 319                                 }
 320                                 args->flags &= ~BTRFS_BALANCE_ARGS_LIMIT;
 321                                 args->flags |= BTRFS_BALANCE_ARGS_LIMIT_RANGE;
 322                         } else {
 323                                 args->flags &= ~BTRFS_BALANCE_ARGS_LIMIT_RANGE;
 324                                 args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
 325                         }
 326                 } else if (!strcmp(this_char, "stripes")) {
 327                         if (!value || !*value) {
 328                                 error("the stripes filter requires an argument");
 329                                 return 1;
 330                         }
 331                         if (parse_range_u32(value, &args->stripes_min,
 332                                             &args->stripes_max)) {
 333                                 error("invalid stripes argument");
 334                                 return 1;
 335                         }
 336                         args->flags |= BTRFS_BALANCE_ARGS_STRIPES_RANGE;
 337                 } else {
 338                         error("unrecognized balance option: %s", this_char);
 339                         return 1;
 340                 }
 341         }
 342
 343         return 0;
 344 }
 345
 346 static void dump_balance_args(struct btrfs_balance_args *args)
 347 {
 348         if (args->flags & BTRFS_BALANCE_ARGS_CONVERT) {
 349                 printf("converting, target=%llu, soft is %s",
 350                        (unsigned long long)args->target,
 351                        (args->flags & BTRFS_BALANCE_ARGS_SOFT) ? "on" : "off");
 352         } else {
 353                 printf("balancing");
 354         }
 355
 356         if (args->flags & BTRFS_BALANCE_ARGS_PROFILES)
 357                 printf(", profiles=%llu", (unsigned long long)args->profiles);
 358         if (args->flags & BTRFS_BALANCE_ARGS_USAGE)
 359                 printf(", usage=%llu", (unsigned long long)args->usage);
 360         if (args->flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) {
 361                 printf(", usage=");
 362                 print_range_u32(args->usage_min, args->usage_max);
 363         }
 364         if (args->flags & BTRFS_BALANCE_ARGS_DEVID)
 365                 printf(", devid=%llu", (unsigned long long)args->devid);
 366         if (args->flags & BTRFS_BALANCE_ARGS_DRANGE)
 367                 printf(", drange=%llu..%llu",
 368                        (unsigned long long)args->pstart,
 369                        (unsigned long long)args->pend);
 370         if (args->flags & BTRFS_BALANCE_ARGS_VRANGE)
 371                 printf(", vrange=%llu..%llu",
 372                        (unsigned long long)args->vstart,
 373                        (unsigned long long)args->vend);
 374         if (args->flags & BTRFS_BALANCE_ARGS_LIMIT)
 375                 printf(", limit=%llu", (unsigned long long)args->limit);
 376         if (args->flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE) {
 377                 printf(", limit=");
 378                 print_range_u32(args->limit_min, args->limit_max);
 379         }
 380         if (args->flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE) {
 381                 printf(", stripes=");
 382                 print_range_u32(args->stripes_min, args->stripes_max);
 383         }
 384
 385         printf("\n");
 386 }
 387
 388 static void dump_ioctl_balance_args(struct btrfs_ioctl_balance_args *args)
 389 {
 390         printf("Dumping filters: flags 0x%llx, state 0x%llx, force is %s\n",
 391                (unsigned long long)args->flags, (unsigned long long)args->state,
 392                (args->flags & BTRFS_BALANCE_FORCE) ? "on" : "off");
 393         if (args->flags & BTRFS_BALANCE_DATA) {
 394                 printf("  DATA (flags 0x%llx): ",
 395                        (unsigned long long)args->data.flags);
 396                 dump_balance_args(&args->data);
 397         }
 398         if (args->flags & BTRFS_BALANCE_METADATA) {
 399                 printf("  METADATA (flags 0x%llx): ",
 400                        (unsigned long long)args->meta.flags);
 401                 dump_balance_args(&args->meta);
 402         }
 403         if (args->flags & BTRFS_BALANCE_SYSTEM) {
 404                 printf("  SYSTEM (flags 0x%llx): ",
 405                        (unsigned long long)args->sys.flags);
 406                 dump_balance_args(&args->sys);
 407         }
 408 }
 409
 410 static int do_balance_v1(int fd)
 411 {
 412         struct btrfs_ioctl_vol_args args;
 413         int ret;
 414
 415         memset(&args, 0, sizeof(args));
 416         ret = ioctl(fd, BTRFS_IOC_BALANCE, &args);
 417         return ret;
 418 }
 419
 420 static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
 421                       int nofilters)
 422 {
 423         int fd;
 424         int ret;
 425         int e;
 426         DIR *dirstream = NULL;
 427
 428         fd = btrfs_open_dir(path, &dirstream, 1);
 429         if (fd < 0)
 430                 return 1;
 431
 432         ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, args);
 433         e = errno;
 434
 435         if (ret < 0) {
 436                 /*
 437                  * older kernels don't have the new balance ioctl, try the
 438                  * old one.  But, the old one doesn't know any filters, so
 439                  * don't fall back if they tried to use the fancy new things
 440                  */
 441                 if (e == ENOTTY && nofilters) {
 442                         ret = do_balance_v1(fd);
 443                         if (ret == 0)
 444                                 goto out;
 445                         e = errno;
 446                 }
 447
 448                 if (e == ECANCELED) {
 449                         if (args->state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 450                                 fprintf(stderr, "balance paused by user\n");
 451                         if (args->state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 452                                 fprintf(stderr, "balance canceled by user\n");
 453                         ret = 0;
 454                 } else {
 455                         error("error during balancing '%s': %s", path, strerror(e));
 456                         if (e != EINPROGRESS)
 457                                 fprintf(stderr,
 458                         "There may be more info in syslog - try dmesg | tail\n");
 459                         ret = 1;
 460                 }
 461         } else {
 462                 printf("Done, had to relocate %llu out of %llu chunks\n",
 463                        (unsigned long long)args->stat.completed,
 464                        (unsigned long long)args->stat.considered);
 465                 ret = 0;
 466         }
 467
 468 out:
 469         close_file_or_dir(fd, dirstream);
 470         return ret;
 471 }
 472
 473 static const char * const cmd_balance_start_usage[] = {
 474         "btrfs balance start [options] <path>",
 475         "Balance chunks across the devices",
 476         "Balance and/or convert (change allocation profile of) chunks that",
 477         "passed all filters in a comma-separated list of filters for a",
 478         "particular chunk type.  If filter list is not given balance all",
 479         "chunks of that type.  In case none of the -d, -m or -s options is",
 480         "given balance all chunks in a filesystem.",
 481         "",
 482         "-d[filters]    act on data chunks",
 483         "-m[filters]    act on metadata chunks",
 484         "-s[filters]    act on system chunks (only under -f)",
 485         "-v             be verbose",
 486         "-f             force reducing of metadata integrity",
 487         NULL
 488 };
 489
 490 static int cmd_balance_start(int argc, char **argv)
 491 {
 492         struct btrfs_ioctl_balance_args args;
 493         struct btrfs_balance_args *ptrs[] = { &args.data, &args.sys,
 494                                                 &args.meta, NULL };
 495         int force = 0;
 496         int verbose = 0;
 497         int nofilters = 1;
 498         int i;
 499
 500         memset(&args, 0, sizeof(args));
 501
 502         optind = 1;
 503         while (1) {
 504                 static const struct option longopts[] = {
 505                         { "data", optional_argument, NULL, 'd'},
 506                         { "metadata", optional_argument, NULL, 'm' },
 507                         { "system", optional_argument, NULL, 's' },
 508                         { "force", no_argument, NULL, 'f' },
 509                         { "verbose", no_argument, NULL, 'v' },
 510                         { NULL, 0, NULL, 0 }
 511                 };
 512
 513                 int opt = getopt_long(argc, argv, "d::s::m::fv", longopts, NULL);
 514                 if (opt < 0)
 515                         break;
 516
 517                 switch (opt) {
 518                 case 'd':
 519                         nofilters = 0;
 520                         args.flags |= BTRFS_BALANCE_DATA;
 521
 522                         if (parse_filters(optarg, &args.data))
 523                                 return 1;
 524                         break;
 525                 case 's':
 526                         nofilters = 0;
 527                         args.flags |= BTRFS_BALANCE_SYSTEM;
 528
 529                         if (parse_filters(optarg, &args.sys))
 530                                 return 1;
 531                         break;
 532                 case 'm':
 533                         nofilters = 0;
 534                         args.flags |= BTRFS_BALANCE_METADATA;
 535
 536                         if (parse_filters(optarg, &args.meta))
 537                                 return 1;
 538                         break;
 539                 case 'f':
 540                         force = 1;
 541                         break;
 542                 case 'v':
 543                         verbose = 1;
 544                         break;
 545                 default:
 546                         usage(cmd_balance_start_usage);
 547                 }
 548         }
 549
 550         if (check_argc_exact(argc - optind, 1))
 551                 usage(cmd_balance_start_usage);
 552
 553         /*
 554          * allow -s only under --force, otherwise do with system chunks
 555          * the same thing we were ordered to do with meta chunks
 556          */
 557         if (args.flags & BTRFS_BALANCE_SYSTEM) {
 558                 if (!force) {
 559                         error(
 560                             "Refusing to explicitly operate on system chunks.\n"
 561                             "Pass --force if you really want to do that.");
 562                         return 1;
 563                 }
 564         } else if (args.flags & BTRFS_BALANCE_METADATA) {
 565                 args.flags |= BTRFS_BALANCE_SYSTEM;
 566                 memcpy(&args.sys, &args.meta,
 567                         sizeof(struct btrfs_balance_args));
 568         }
 569
 570         if (nofilters) {
 571                 /* relocate everything - no filters */
 572                 args.flags |= BTRFS_BALANCE_TYPE_MASK;
 573         }
 574
 575         /* drange makes sense only when devid is set */
 576         for (i = 0; ptrs[i]; i++) {
 577                 if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
 578                     !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_DEVID)) {
 579                         error("drange filter must be used with devid filter");
 580                         return 1;
 581                 }
 582         }
 583
 584         /* soft makes sense only when convert for corresponding type is set */
 585         for (i = 0; ptrs[i]; i++) {
 586                 if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_SOFT) &&
 587                     !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_CONVERT)) {
 588                         error("'soft' option can be used only when converting profiles");
 589                         return 1;
 590                 }
 591         }
 592
 593         if (force)
 594                 args.flags |= BTRFS_BALANCE_FORCE;
 595         if (verbose)
 596                 dump_ioctl_balance_args(&args);
 597
 598         return do_balance(argv[optind], &args, nofilters);
 599 }
 600
 601 static const char * const cmd_balance_pause_usage[] = {
 602         "btrfs balance pause <path>",
 603         "Pause running balance",
 604         NULL
 605 };
 606
 607 static int cmd_balance_pause(int argc, char **argv)
 608 {
 609         const char *path;
 610         int fd;
 611         int ret;
 612         int e;
 613         DIR *dirstream = NULL;
 614
 615         clean_args_no_options(argc, argv, cmd_balance_pause_usage);
 616
 617         if (check_argc_exact(argc - optind, 1))
 618                 usage(cmd_balance_pause_usage);
 619
 620         path = argv[optind];
 621
 622         fd = btrfs_open_dir(path, &dirstream, 1);
 623         if (fd < 0)
 624                 return 1;
 625
 626         ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
 627         e = errno;
 628         close_file_or_dir(fd, dirstream);
 629
 630         if (ret < 0) {
 631                 error("balance pause on '%s' failed: %s", path,
 632                         (e == ENOTCONN) ? "Not running" : strerror(e));
 633                 if (e == ENOTCONN)
 634                         return 2;
 635                 else
 636                         return 1;
 637         }
 638
 639         return 0;
 640 }
 641
 642 static const char * const cmd_balance_cancel_usage[] = {
 643         "btrfs balance cancel <path>",
 644         "Cancel running or paused balance",
 645         NULL
 646 };
 647
 648 static int cmd_balance_cancel(int argc, char **argv)
 649 {
 650         const char *path;
 651         int fd;
 652         int ret;
 653         int e;
 654         DIR *dirstream = NULL;
 655
 656         clean_args_no_options(argc, argv, cmd_balance_cancel_usage);
 657
 658         if (check_argc_exact(argc - optind, 1))
 659                 usage(cmd_balance_cancel_usage);
 660
 661         path = argv[optind];
 662
 663         fd = btrfs_open_dir(path, &dirstream, 1);
 664         if (fd < 0)
 665                 return 1;
 666
 667         ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
 668         e = errno;
 669         close_file_or_dir(fd, dirstream);
 670
 671         if (ret < 0) {
 672                 error("balance cancel on '%s' failed: %s", path,
 673                         (e == ENOTCONN) ? "Not in progress" : strerror(e));
 674                 if (e == ENOTCONN)
 675                         return 2;
 676                 else
 677                         return 1;
 678         }
 679
 680         return 0;
 681 }
 682
 683 static const char * const cmd_balance_resume_usage[] = {
 684         "btrfs balance resume <path>",
 685         "Resume interrupted balance",
 686         NULL
 687 };
 688
 689 static int cmd_balance_resume(int argc, char **argv)
 690 {
 691         struct btrfs_ioctl_balance_args args;
 692         const char *path;
 693         DIR *dirstream = NULL;
 694         int fd;
 695         int ret;
 696         int e;
 697
 698         clean_args_no_options(argc, argv, cmd_balance_resume_usage);
 699
 700         if (check_argc_exact(argc - optind, 1))
 701                 usage(cmd_balance_resume_usage);
 702
 703         path = argv[optind];
 704
 705         fd = btrfs_open_dir(path, &dirstream, 1);
 706         if (fd < 0)
 707                 return 1;
 708
 709         memset(&args, 0, sizeof(args));
 710         args.flags |= BTRFS_BALANCE_RESUME;
 711
 712         ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, &args);
 713         e = errno;
 714         close_file_or_dir(fd, dirstream);
 715
 716         if (ret < 0) {
 717                 if (e == ECANCELED) {
 718                         if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 719                                 fprintf(stderr, "balance paused by user\n");
 720                         if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 721                                 fprintf(stderr, "balance canceled by user\n");
 722                 } else if (e == ENOTCONN || e == EINPROGRESS) {
 723                         error("balance resume on '%s' failed: %s", path,
 724                                 (e == ENOTCONN) ? "Not in progress" :
 725                                                   "Already running");
 726                         if (e == ENOTCONN)
 727                                 return 2;
 728                         else
 729                                 return 1;
 730                 } else {
 731                         error("error during balancing '%s': %s\n"
 732                           "There may be more info in syslog - try dmesg | tail",
 733                                 path, strerror(e));
 734                         return 1;
 735                 }
 736         } else {
 737                 printf("Done, had to relocate %llu out of %llu chunks\n",
 738                        (unsigned long long)args.stat.completed,
 739                        (unsigned long long)args.stat.considered);
 740         }
 741
 742         return 0;
 743 }
 744
 745 static const char * const cmd_balance_status_usage[] = {
 746         "btrfs balance status [-v] <path>",
 747         "Show status of running or paused balance",
 748         "",
 749         "-v     be verbose",
 750         NULL
 751 };
 752
 753 /* Checks the status of the balance if any
 754  * return codes:
 755  *   2 : Error failed to know if there is any pending balance
 756  *   1 : Successful to know status of a pending balance
 757  *   0 : When there is no pending balance or completed
 758  */
 759 static int cmd_balance_status(int argc, char **argv)
 760 {
 761         struct btrfs_ioctl_balance_args args;
 762         const char *path;
 763         DIR *dirstream = NULL;
 764         int fd;
 765         int verbose = 0;
 766         int ret;
 767         int e;
 768
 769         optind = 1;
 770         while (1) {
 771                 int opt;
 772                 static const struct option longopts[] = {
 773                         { "verbose", no_argument, NULL, 'v' },
 774                         { NULL, 0, NULL, 0 }
 775                 };
 776
 777                 opt = getopt_long(argc, argv, "v", longopts, NULL);
 778                 if (opt < 0)
 779                         break;
 780
 781                 switch (opt) {
 782                 case 'v':
 783                         verbose = 1;
 784                         break;
 785                 default:
 786                         usage(cmd_balance_status_usage);
 787                 }
 788         }
 789
 790         if (check_argc_exact(argc - optind, 1))
 791                 usage(cmd_balance_status_usage);
 792
 793         path = argv[optind];
 794
 795         fd = btrfs_open_dir(path, &dirstream, 1);
 796         if (fd < 0)
 797                 return 2;
 798
 799         ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
 800         e = errno;
 801         close_file_or_dir(fd, dirstream);
 802
 803         if (ret < 0) {
 804                 if (e == ENOTCONN) {
 805                         printf("No balance found on '%s'\n", path);
 806                         return 0;
 807                 }
 808                 error("balance status on '%s' failed: %s", path, strerror(e));
 809                 return 2;
 810         }
 811
 812         if (args.state & BTRFS_BALANCE_STATE_RUNNING) {
 813                 printf("Balance on '%s' is running", path);
 814                 if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
 815                         printf(", cancel requested\n");
 816                 else if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
 817                         printf(", pause requested\n");
 818                 else
 819                         printf("\n");
 820         } else {
 821                 printf("Balance on '%s' is paused\n", path);
 822         }
 823
 824         printf("%llu out of about %llu chunks balanced (%llu considered), "
 825                "%3.f%% left\n", (unsigned long long)args.stat.completed,
 826                (unsigned long long)args.stat.expected,
 827                (unsigned long long)args.stat.considered,
 828                100 * (1 - (float)args.stat.completed/args.stat.expected));
 829
 830         if (verbose)
 831                 dump_ioctl_balance_args(&args);
 832
 833         return 1;
 834 }
 835
 836 static const char balance_cmd_group_info[] =
 837 "balance data accross devices, or change block groups using filters";
 838
 839 const struct cmd_group balance_cmd_group = {
 840         balance_cmd_group_usage, balance_cmd_group_info, {
 841                 { "start", cmd_balance_start, cmd_balance_start_usage, NULL, 0 },
 842                 { "pause", cmd_balance_pause, cmd_balance_pause_usage, NULL, 0 },
 843                 { "cancel", cmd_balance_cancel, cmd_balance_cancel_usage, NULL, 0 },
 844                 { "resume", cmd_balance_resume, cmd_balance_resume_usage, NULL, 0 },
 845                 { "status", cmd_balance_status, cmd_balance_status_usage, NULL, 0 },
 846                 NULL_CMD_STRUCT
 847         }
 848 };
 849
 850 int cmd_balance(int argc, char **argv)
 851 {
 852         if (argc == 2) {
 853                 /* old 'btrfs filesystem balance <path>' syntax */
 854                 struct btrfs_ioctl_balance_args args;
 855
 856                 memset(&args, 0, sizeof(args));
 857                 args.flags |= BTRFS_BALANCE_TYPE_MASK;
 858
 859                 return do_balance(argv[1], &args, 1);
 860         }
 861
 862         return handle_command_group(&balance_cmd_group, argc, argv);
 863 }