cmds-filesystem.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 <sys/ioctl.h>
  22 #include <errno.h>
  23 #include <uuid/uuid.h>
  24 #include <ctype.h>
  25 #include <fcntl.h>
  26 #include <ftw.h>
  27 #include <mntent.h>
  28 #include <linux/limits.h>
  29 #include <getopt.h>
  30
  31 #include "kerncompat.h"
  32 #include "ctree.h"
  33 #include "ioctl.h"
  34 #include "utils.h"
  35 #include "volumes.h"
  36 #include "commands.h"
  37 #include "cmds-fi-usage.h"
  38 #include "list_sort.h"
  39 #include "disk-io.h"
  40
  41
  42 /*
  43  * for btrfs fi show, we maintain a hash of fsids we've already printed.
  44  * This way we don't print dups if a given FS is mounted more than once.
  45  */
  46 #define SEEN_FSID_HASH_SIZE 256
  47
  48 struct seen_fsid {
  49         u8 fsid[BTRFS_FSID_SIZE];
  50         struct seen_fsid *next;
  51 };
  52
  53 static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
  54
  55 static int is_seen_fsid(u8 *fsid)
  56 {
  57         u8 hash = fsid[0];
  58         int slot = hash % SEEN_FSID_HASH_SIZE;
  59         struct seen_fsid *seen = seen_fsid_hash[slot];
  60
  61         return seen ? 1 : 0;
  62 }
  63
  64 static int add_seen_fsid(u8 *fsid)
  65 {
  66         u8 hash = fsid[0];
  67         int slot = hash % SEEN_FSID_HASH_SIZE;
  68         struct seen_fsid *seen = seen_fsid_hash[slot];
  69         struct seen_fsid *alloc;
  70
  71         if (!seen)
  72                 goto insert;
  73
  74         while (1) {
  75                 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
  76                         return -EEXIST;
  77
  78                 if (!seen->next)
  79                         break;
  80
  81                 seen = seen->next;
  82         }
  83
  84 insert:
  85
  86         alloc = malloc(sizeof(*alloc));
  87         if (!alloc)
  88                 return -ENOMEM;
  89
  90         alloc->next = NULL;
  91         memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
  92
  93         if (seen)
  94                 seen->next = alloc;
  95         else
  96                 seen_fsid_hash[slot] = alloc;
  97
  98         return 0;
  99 }
 100
 101 static void free_seen_fsid(void)
 102 {
 103         int slot;
 104         struct seen_fsid *seen;
 105         struct seen_fsid *next;
 106
 107         for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
 108                 seen = seen_fsid_hash[slot];
 109                 while (seen) {
 110                         next = seen->next;
 111                         free(seen);
 112                         seen = next;
 113                 }
 114                 seen_fsid_hash[slot] = NULL;
 115         }
 116 }
 117
 118 static const char * const filesystem_cmd_group_usage[] = {
 119         "btrfs filesystem [<group>] <command> [<args>]",
 120         NULL
 121 };
 122
 123 static const char * const cmd_filesystem_df_usage[] = {
 124        "btrfs filesystem df [options] <path>",
 125        "Show space usage information for a mount point",
 126         "-b|--raw           raw numbers in bytes",
 127         "-h|--human-readable",
 128         "                   human friendly numbers, base 1024 (default)",
 129         "-H                 human friendly numbers, base 1000",
 130         "--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",
 131         "--si               use 1000 as a base (kB, MB, GB, TB)",
 132         "-k|--kbytes        show sizes in KiB, or kB with --si",
 133         "-m|--mbytes        show sizes in MiB, or MB with --si",
 134         "-g|--gbytes        show sizes in GiB, or GB with --si",
 135         "-t|--tbytes        show sizes in TiB, or TB with --si",
 136        NULL
 137 };
 138
 139 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 140 {
 141         u64 count = 0;
 142         int ret, e;
 143         struct btrfs_ioctl_space_args *sargs;
 144
 145         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 146         if (!sargs)
 147                 return -ENOMEM;
 148
 149         sargs->space_slots = 0;
 150         sargs->total_spaces = 0;
 151
 152         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 153         e = errno;
 154         if (ret) {
 155                 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
 156                         strerror(e));
 157                 free(sargs);
 158                 return -e;
 159         }
 160         /* This really should never happen */
 161         if (!sargs->total_spaces) {
 162                 free(sargs);
 163                 return -ENOENT;
 164         }
 165         count = sargs->total_spaces;
 166         free(sargs);
 167
 168         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 169                         (count * sizeof(struct btrfs_ioctl_space_info)));
 170         if (!sargs)
 171                 return -ENOMEM;
 172
 173         sargs->space_slots = count;
 174         sargs->total_spaces = 0;
 175         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 176         e = errno;
 177         if (ret) {
 178                 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
 179                                 count, strerror(e));
 180                 free(sargs);
 181                 return -e;
 182         }
 183         *sargs_ret = sargs;
 184         return 0;
 185 }
 186
 187 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
 188 {
 189         u64 i;
 190         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 191
 192         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 193                 printf("%s, %s: total=%s, used=%s\n",
 194                         btrfs_group_type_str(sp->flags),
 195                         btrfs_group_profile_str(sp->flags),
 196                         pretty_size_mode(sp->total_bytes, unit_mode),
 197                         pretty_size_mode(sp->used_bytes, unit_mode));
 198         }
 199 }
 200
 201 static int cmd_filesystem_df(int argc, char **argv)
 202 {
 203         struct btrfs_ioctl_space_args *sargs = NULL;
 204         int ret;
 205         int fd;
 206         char *path;
 207         DIR *dirstream = NULL;
 208         unsigned unit_mode = UNITS_DEFAULT;
 209
 210         while (1) {
 211                 int c;
 212                 static const struct option long_options[] = {
 213                         { "raw", no_argument, NULL, 'b'},
 214                         { "kbytes", no_argument, NULL, 'k'},
 215                         { "mbytes", no_argument, NULL, 'm'},
 216                         { "gbytes", no_argument, NULL, 'g'},
 217                         { "tbytes", no_argument, NULL, 't'},
 218                         { "si", no_argument, NULL, GETOPT_VAL_SI},
 219                         { "iec", no_argument, NULL, GETOPT_VAL_IEC},
 220                         { "human-readable", no_argument, NULL,
 221                                 GETOPT_VAL_HUMAN_READABLE},
 222                         { NULL, 0, NULL, 0 }
 223                 };
 224
 225                 c = getopt_long(argc, argv, "bhHkmgt", long_options, NULL);
 226                 if (c < 0)
 227                         break;
 228                 switch (c) {
 229                 case 'b':
 230                         unit_mode = UNITS_RAW;
 231                         break;
 232                 case 'k':
 233                         units_set_base(&unit_mode, UNITS_KBYTES);
 234                         break;
 235                 case 'm':
 236                         units_set_base(&unit_mode, UNITS_MBYTES);
 237                         break;
 238                 case 'g':
 239                         units_set_base(&unit_mode, UNITS_GBYTES);
 240                         break;
 241                 case 't':
 242                         units_set_base(&unit_mode, UNITS_TBYTES);
 243                         break;
 244                 case GETOPT_VAL_HUMAN_READABLE:
 245                 case 'h':
 246                         unit_mode = UNITS_HUMAN_BINARY;
 247                         break;
 248                 case 'H':
 249                         unit_mode = UNITS_HUMAN_DECIMAL;
 250                         break;
 251                 case GETOPT_VAL_SI:
 252                         units_set_mode(&unit_mode, UNITS_DECIMAL);
 253                         break;
 254                 case GETOPT_VAL_IEC:
 255                         units_set_mode(&unit_mode, UNITS_BINARY);
 256                         break;
 257                 default:
 258                         usage(cmd_filesystem_df_usage);
 259                 }
 260         }
 261
 262         if (check_argc_exact(argc, optind + 1))
 263                 usage(cmd_filesystem_df_usage);
 264
 265         path = argv[optind];
 266
 267         fd = open_file_or_dir(path, &dirstream);
 268         if (fd < 0) {
 269                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 270                 return 1;
 271         }
 272         ret = get_df(fd, &sargs);
 273
 274         if (ret == 0) {
 275                 print_df(sargs, unit_mode);
 276                 free(sargs);
 277         } else {
 278                 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
 279         }
 280
 281         close_file_or_dir(fd, dirstream);
 282         return !!ret;
 283 }
 284
 285 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
 286                                         char *search)
 287 {
 288         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 289         int search_len = strlen(search);
 290
 291         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 292         uuid_unparse(fsid, uuidbuf);
 293         if (!strncmp(uuidbuf, search, search_len))
 294                 return 1;
 295
 296         if (strlen(label) && strcmp(label, search) == 0)
 297                 return 1;
 298
 299         if (strcmp(mnt, search) == 0)
 300                 return 1;
 301
 302         return 0;
 303 }
 304
 305 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 306 {
 307         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 308         struct list_head *cur;
 309         struct btrfs_device *device;
 310         int search_len = strlen(search);
 311
 312         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 313         uuid_unparse(fs_devices->fsid, uuidbuf);
 314         if (!strncmp(uuidbuf, search, search_len))
 315                 return 1;
 316
 317         list_for_each(cur, &fs_devices->devices) {
 318                 device = list_entry(cur, struct btrfs_device, dev_list);
 319                 if ((device->label && strcmp(device->label, search) == 0) ||
 320                     strcmp(device->name, search) == 0)
 321                         return 1;
 322         }
 323         return 0;
 324 }
 325
 326 /*
 327  * Sort devices by devid, ascending
 328  */
 329 static int cmp_device_id(void *priv, struct list_head *a,
 330                 struct list_head *b)
 331 {
 332         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 333                         dev_list);
 334         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 335                         dev_list);
 336
 337         return da->devid < db->devid ? -1 :
 338                 da->devid > db->devid ? 1 : 0;
 339 }
 340
 341 static void splice_device_list(struct list_head *seed_devices,
 342                                struct list_head *all_devices)
 343 {
 344         struct btrfs_device *in_all, *next_all;
 345         struct btrfs_device *in_seed, *next_seed;
 346
 347         list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
 348                 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
 349                                                                 dev_list) {
 350                         if (in_all->devid == in_seed->devid) {
 351                                 /*
 352                                  * When do dev replace in a sprout fs
 353                                  * to a dev in its seed fs, the replacing
 354                                  * dev will reside in the sprout fs and
 355                                  * the replaced dev will still exist
 356                                  * in the seed fs.
 357                                  * So pick the latest one when showing
 358                                  * the sprout fs.
 359                                  */
 360                                 if (in_all->generation
 361                                                 < in_seed->generation) {
 362                                         list_del(&in_all->dev_list);
 363                                         free(in_all);
 364                                 } else if (in_all->generation
 365                                                 > in_seed->generation) {
 366                                         list_del(&in_seed->dev_list);
 367                                         free(in_seed);
 368                                 }
 369                                 break;
 370                         }
 371                 }
 372         }
 373
 374         list_splice(seed_devices, all_devices);
 375 }
 376
 377 static void print_devices(struct btrfs_fs_devices *fs_devices,
 378                           u64 *devs_found, unsigned unit_mode)
 379 {
 380         struct btrfs_device *device;
 381         struct btrfs_fs_devices *cur_fs;
 382         struct list_head *all_devices;
 383
 384         all_devices = &fs_devices->devices;
 385         cur_fs = fs_devices->seed;
 386         /* add all devices of seed fs to the fs to be printed */
 387         while (cur_fs) {
 388                 splice_device_list(&cur_fs->devices, all_devices);
 389                 cur_fs = cur_fs->seed;
 390         }
 391
 392         list_sort(NULL, all_devices, cmp_device_id);
 393         list_for_each_entry(device, all_devices, dev_list) {
 394                 printf("\tdevid %4llu size %s used %s path %s\n",
 395                        (unsigned long long)device->devid,
 396                        pretty_size_mode(device->total_bytes, unit_mode),
 397                        pretty_size_mode(device->bytes_used, unit_mode),
 398                        device->name);
 399
 400                 (*devs_found)++;
 401         }
 402 }
 403
 404 static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
 405                            unsigned unit_mode)
 406 {
 407         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 408         struct btrfs_device *device;
 409         u64 devs_found = 0;
 410         u64 total;
 411
 412         if (add_seen_fsid(fs_devices->fsid))
 413                 return;
 414
 415         uuid_unparse(fs_devices->fsid, uuidbuf);
 416         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 417                             dev_list);
 418         if (device->label && device->label[0])
 419                 printf("Label: '%s' ", device->label);
 420         else
 421                 printf("Label: none ");
 422
 423         total = device->total_devs;
 424         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 425                (unsigned long long)total,
 426                pretty_size_mode(device->super_bytes_used, unit_mode));
 427
 428         print_devices(fs_devices, &devs_found, unit_mode);
 429
 430         if (devs_found < total) {
 431                 printf("\t*** Some devices missing\n");
 432         }
 433         printf("\n");
 434 }
 435
 436 /* adds up all the used spaces as reported by the space info ioctl
 437  */
 438 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 439 {
 440         u64 ret = 0;
 441         int i;
 442         for (i = 0; i < si->total_spaces; i++)
 443                 ret += si->spaces[i].used_bytes;
 444         return ret;
 445 }
 446
 447 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 448                 struct btrfs_ioctl_dev_info_args *dev_info,
 449                 struct btrfs_ioctl_space_args *space_info,
 450                 char *label, char *path, unsigned unit_mode)
 451 {
 452         int i;
 453         int fd;
 454         int missing = 0;
 455         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 456         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 457         int ret;
 458
 459         ret = add_seen_fsid(fs_info->fsid);
 460         if (ret == -EEXIST)
 461                 return 0;
 462         else if (ret)
 463                 return ret;
 464
 465         uuid_unparse(fs_info->fsid, uuidbuf);
 466         if (label && strlen(label))
 467                 printf("Label: '%s' ", label);
 468         else
 469                 printf("Label: none ");
 470
 471         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 472                         fs_info->num_devices,
 473                         pretty_size_mode(calc_used_bytes(space_info),
 474                                          unit_mode));
 475
 476         for (i = 0; i < fs_info->num_devices; i++) {
 477                 char *canonical_path;
 478
 479                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 480
 481                 /* Add check for missing devices even mounted */
 482                 fd = open((char *)tmp_dev_info->path, O_RDONLY);
 483                 if (fd < 0) {
 484                         missing = 1;
 485                         continue;
 486                 }
 487                 close(fd);
 488                 canonical_path = canonicalize_path((char *)tmp_dev_info->path);
 489                 printf("\tdevid %4llu size %s used %s path %s\n",
 490                         tmp_dev_info->devid,
 491                         pretty_size_mode(tmp_dev_info->total_bytes, unit_mode),
 492                         pretty_size_mode(tmp_dev_info->bytes_used, unit_mode),
 493                         canonical_path);
 494
 495                 free(canonical_path);
 496         }
 497
 498         if (missing)
 499                 printf("\t*** Some devices missing\n");
 500         printf("\n");
 501         return 0;
 502 }
 503
 504 static int btrfs_scan_kernel(void *search, unsigned unit_mode)
 505 {
 506         int ret = 0, fd;
 507         int found = 0;
 508         FILE *f;
 509         struct mntent *mnt;
 510         struct btrfs_ioctl_fs_info_args fs_info_arg;
 511         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 512         struct btrfs_ioctl_space_args *space_info_arg = NULL;
 513         char label[BTRFS_LABEL_SIZE];
 514
 515         f = setmntent("/proc/self/mounts", "r");
 516         if (f == NULL)
 517                 return 1;
 518
 519         memset(label, 0, sizeof(label));
 520         while ((mnt = getmntent(f)) != NULL) {
 521                 if (strcmp(mnt->mnt_type, "btrfs"))
 522                         continue;
 523                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 524                                 &dev_info_arg);
 525                 if (ret) {
 526                         kfree(dev_info_arg);
 527                         goto out;
 528                 }
 529
 530                 if (get_label_mounted(mnt->mnt_dir, label)) {
 531                         kfree(dev_info_arg);
 532                         goto out;
 533                 }
 534                 if (search && !match_search_item_kernel(fs_info_arg.fsid,
 535                                         mnt->mnt_dir, label, search)) {
 536                         kfree(dev_info_arg);
 537                         continue;
 538                 }
 539
 540                 fd = open(mnt->mnt_dir, O_RDONLY);
 541                 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
 542                         print_one_fs(&fs_info_arg, dev_info_arg,
 543                                      space_info_arg, label, mnt->mnt_dir,
 544                                      unit_mode);
 545                         kfree(space_info_arg);
 546                         memset(label, 0, sizeof(label));
 547                         found = 1;
 548                 }
 549                 if (fd != -1)
 550                         close(fd);
 551                 kfree(dev_info_arg);
 552         }
 553
 554 out:
 555         endmntent(f);
 556         return !found;
 557 }
 558
 559 static int dev_to_fsid(char *dev, __u8 *fsid)
 560 {
 561         struct btrfs_super_block *disk_super;
 562         char *buf;
 563         int ret;
 564         int fd;
 565
 566         buf = malloc(4096);
 567         if (!buf)
 568                 return -ENOMEM;
 569
 570         fd = open(dev, O_RDONLY);
 571         if (fd < 0) {
 572                 ret = -errno;
 573                 free(buf);
 574                 return ret;
 575         }
 576
 577         disk_super = (struct btrfs_super_block *)buf;
 578         ret = btrfs_read_dev_super(fd, disk_super,
 579                                    BTRFS_SUPER_INFO_OFFSET, 0);
 580         if (ret)
 581                 goto out;
 582
 583         memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 584         ret = 0;
 585
 586 out:
 587         close(fd);
 588         free(buf);
 589         return ret;
 590 }
 591
 592 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 593 {
 594         struct btrfs_fs_devices *cur_seed, *next_seed;
 595         struct btrfs_device *device;
 596
 597         while (!list_empty(&fs_devices->devices)) {
 598                 device = list_entry(fs_devices->devices.next,
 599                                         struct btrfs_device, dev_list);
 600                 list_del(&device->dev_list);
 601
 602                 free(device->name);
 603                 free(device->label);
 604                 free(device);
 605         }
 606
 607         /* free seed fs chain */
 608         cur_seed = fs_devices->seed;
 609         fs_devices->seed = NULL;
 610         while (cur_seed) {
 611                 next_seed = cur_seed->seed;
 612                 free(cur_seed);
 613
 614                 cur_seed = next_seed;
 615         }
 616
 617         list_del(&fs_devices->list);
 618         free(fs_devices);
 619 }
 620
 621 static int copy_device(struct btrfs_device *dst,
 622                        struct btrfs_device *src)
 623 {
 624         dst->devid = src->devid;
 625         memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
 626         if (src->name == NULL)
 627                 dst->name = NULL;
 628         else {
 629                 dst->name = strdup(src->name);
 630                 if (!dst->name)
 631                         return -ENOMEM;
 632         }
 633         if (src->label == NULL)
 634                 dst->label = NULL;
 635         else {
 636                 dst->label = strdup(src->label);
 637                 if (!dst->label) {
 638                         free(dst->name);
 639                         return -ENOMEM;
 640                 }
 641         }
 642         dst->total_devs = src->total_devs;
 643         dst->super_bytes_used = src->super_bytes_used;
 644         dst->total_bytes = src->total_bytes;
 645         dst->bytes_used = src->bytes_used;
 646         dst->generation = src->generation;
 647
 648         return 0;
 649 }
 650
 651 static int copy_fs_devices(struct btrfs_fs_devices *dst,
 652                            struct btrfs_fs_devices *src)
 653 {
 654         struct btrfs_device *cur_dev, *dev_copy;
 655         int ret = 0;
 656
 657         memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
 658         INIT_LIST_HEAD(&dst->devices);
 659         dst->seed = NULL;
 660
 661         list_for_each_entry(cur_dev, &src->devices, dev_list) {
 662                 dev_copy = malloc(sizeof(*dev_copy));
 663                 if (!dev_copy) {
 664                         ret = -ENOMEM;
 665                         break;
 666                 }
 667
 668                 ret = copy_device(dev_copy, cur_dev);
 669                 if (ret) {
 670                         free(dev_copy);
 671                         break;
 672                 }
 673
 674                 list_add(&dev_copy->dev_list, &dst->devices);
 675                 dev_copy->fs_devices = dst;
 676         }
 677
 678         return ret;
 679 }
 680
 681 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
 682                               struct btrfs_fs_devices *copy,
 683                               struct list_head *fs_uuids) {
 684         struct btrfs_fs_devices *cur_fs;
 685
 686         list_for_each_entry(cur_fs, fs_uuids, list)
 687                 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
 688                         return copy_fs_devices(copy, cur_fs);
 689
 690         return 1;
 691 }
 692
 693 static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
 694 {
 695         struct btrfs_device *device;
 696         int dev_cnt_total, dev_cnt = 0;
 697
 698         device = list_first_entry(&fs_devices->devices, struct btrfs_device,
 699                                   dev_list);
 700
 701         dev_cnt_total = device->total_devs;
 702
 703         list_for_each_entry(device, &fs_devices->devices, dev_list)
 704                 dev_cnt++;
 705
 706         return dev_cnt_total != dev_cnt;
 707 }
 708
 709 static int search_umounted_fs_uuids(struct list_head *all_uuids,
 710                                     char *search, int *found)
 711 {
 712         struct btrfs_fs_devices *cur_fs, *fs_copy;
 713         struct list_head *fs_uuids;
 714         int ret = 0;
 715
 716         fs_uuids = btrfs_scanned_uuids();
 717
 718         /*
 719          * The fs_uuids list is global, and open_ctree_* will
 720          * modify it, make a private copy here
 721          */
 722         list_for_each_entry(cur_fs, fs_uuids, list) {
 723                 /* don't bother handle all fs, if search target specified */
 724                 if (search) {
 725                         if (uuid_search(cur_fs, search) == 0)
 726                                 continue;
 727                         if (found)
 728                                 *found = 1;
 729                 }
 730
 731                 /* skip all fs already shown as mounted fs */
 732                 if (is_seen_fsid(cur_fs->fsid))
 733                         continue;
 734
 735                 fs_copy = malloc(sizeof(*fs_copy));
 736                 if (!fs_copy) {
 737                         ret = -ENOMEM;
 738                         goto out;
 739                 }
 740
 741                 ret = copy_fs_devices(fs_copy, cur_fs);
 742                 if (ret) {
 743                         free(fs_copy);
 744                         goto out;
 745                 }
 746
 747                 list_add(&fs_copy->list, all_uuids);
 748         }
 749
 750 out:
 751         return ret;
 752 }
 753
 754 static int map_seed_devices(struct list_head *all_uuids)
 755 {
 756         struct btrfs_fs_devices *cur_fs, *cur_seed;
 757         struct btrfs_fs_devices *seed_copy;
 758         struct btrfs_fs_devices *opened_fs;
 759         struct btrfs_device *device;
 760         struct btrfs_fs_info *fs_info;
 761         struct list_head *fs_uuids;
 762         int ret = 0;
 763
 764         fs_uuids = btrfs_scanned_uuids();
 765
 766         list_for_each_entry(cur_fs, all_uuids, list) {
 767                 device = list_first_entry(&cur_fs->devices,
 768                                                 struct btrfs_device, dev_list);
 769                 if (!device)
 770                         continue;
 771
 772                 /* skip fs without seeds */
 773                 if (!has_seed_devices(cur_fs))
 774                         continue;
 775
 776                 /*
 777                  * open_ctree_* detects seed/sprout mapping
 778                  */
 779                 fs_info = open_ctree_fs_info(device->name, 0, 0,
 780                                                 OPEN_CTREE_PARTIAL);
 781                 if (!fs_info)
 782                         continue;
 783
 784                 /*
 785                  * copy the seed chain under the opened fs
 786                  */
 787                 opened_fs = fs_info->fs_devices;
 788                 cur_seed = cur_fs;
 789                 while (opened_fs->seed) {
 790                         seed_copy = malloc(sizeof(*seed_copy));
 791                         if (!seed_copy) {
 792                                 ret = -ENOMEM;
 793                                 goto fail_out;
 794                         }
 795                         ret = find_and_copy_seed(opened_fs->seed, seed_copy,
 796                                                  fs_uuids);
 797                         if (ret) {
 798                                 free(seed_copy);
 799                                 goto fail_out;
 800                         }
 801
 802                         cur_seed->seed = seed_copy;
 803
 804                         opened_fs = opened_fs->seed;
 805                         cur_seed = cur_seed->seed;
 806                 }
 807
 808                 close_ctree(fs_info->chunk_root);
 809         }
 810
 811 out:
 812         return ret;
 813 fail_out:
 814         close_ctree(fs_info->chunk_root);
 815         goto out;
 816 }
 817
 818 static const char * const cmd_show_usage[] = {
 819         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 820         "Show the structure of a filesystem",
 821         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 822         "-m|--mounted       show only mounted btrfs",
 823         "--raw              raw numbers in bytes",
 824         "--human-readable   human friendly numbers, base 1024 (default)",
 825         "--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",
 826         "--si               use 1000 as a base (kB, MB, GB, TB)",
 827         "--kbytes           show sizes in KiB, or kB with --si",
 828         "--mbytes           show sizes in MiB, or MB with --si",
 829         "--gbytes           show sizes in GiB, or GB with --si",
 830         "--tbytes           show sizes in TiB, or TB with --si",
 831         "If no argument is given, structure of all present filesystems is shown.",
 832         NULL
 833 };
 834
 835 static int cmd_show(int argc, char **argv)
 836 {
 837         LIST_HEAD(all_uuids);
 838         struct btrfs_fs_devices *fs_devices;
 839         char *search = NULL;
 840         int ret;
 841         /* default, search both kernel and udev */
 842         int where = -1;
 843         int type = 0;
 844         char mp[PATH_MAX];
 845         char path[PATH_MAX];
 846         __u8 fsid[BTRFS_FSID_SIZE];
 847         char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 848         unsigned unit_mode = UNITS_DEFAULT;
 849         int found = 0;
 850
 851         while (1) {
 852                 int c;
 853                 static const struct option long_options[] = {
 854                         { "all-devices", no_argument, NULL, 'd'},
 855                         { "mounted", no_argument, NULL, 'm'},
 856                         { "raw", no_argument, NULL, GETOPT_VAL_RAW},
 857                         { "kbytes", no_argument, NULL, GETOPT_VAL_KBYTES},
 858                         { "mbytes", no_argument, NULL, GETOPT_VAL_MBYTES},
 859                         { "gbytes", no_argument, NULL, GETOPT_VAL_GBYTES},
 860                         { "tbytes", no_argument, NULL, GETOPT_VAL_TBYTES},
 861                         { "si", no_argument, NULL, GETOPT_VAL_SI},
 862                         { "iec", no_argument, NULL, GETOPT_VAL_IEC},
 863                         { "human-readable", no_argument, NULL,
 864                                 GETOPT_VAL_HUMAN_READABLE},
 865                         { NULL, 0, NULL, 0 }
 866                 };
 867
 868                 c = getopt_long(argc, argv, "dm", long_options, NULL);
 869                 if (c < 0)
 870                         break;
 871                 switch (c) {
 872                 case 'd':
 873                         where = BTRFS_SCAN_LBLKID;
 874                         break;
 875                 case 'm':
 876                         where = BTRFS_SCAN_MOUNTED;
 877                         break;
 878                 case GETOPT_VAL_RAW:
 879                         units_set_mode(&unit_mode, UNITS_RAW);
 880                         break;
 881                 case GETOPT_VAL_KBYTES:
 882                         units_set_base(&unit_mode, UNITS_KBYTES);
 883                         break;
 884                 case GETOPT_VAL_MBYTES:
 885                         units_set_base(&unit_mode, UNITS_MBYTES);
 886                         break;
 887                 case GETOPT_VAL_GBYTES:
 888                         units_set_base(&unit_mode, UNITS_GBYTES);
 889                         break;
 890                 case GETOPT_VAL_TBYTES:
 891                         units_set_base(&unit_mode, UNITS_TBYTES);
 892                         break;
 893                 case GETOPT_VAL_SI:
 894                         units_set_mode(&unit_mode, UNITS_DECIMAL);
 895                         break;
 896                 case GETOPT_VAL_IEC:
 897                         units_set_mode(&unit_mode, UNITS_BINARY);
 898                         break;
 899                 case GETOPT_VAL_HUMAN_READABLE:
 900                         units_set_mode(&unit_mode, UNITS_HUMAN_BINARY);
 901                         break;
 902                 default:
 903                         usage(cmd_show_usage);
 904                 }
 905         }
 906
 907         if (check_argc_max(argc, optind + 1))
 908                 usage(cmd_show_usage);
 909
 910         if (argc > optind) {
 911                 search = argv[optind];
 912                 if (strlen(search) == 0)
 913                         usage(cmd_show_usage);
 914                 type = check_arg_type(search);
 915
 916                 /*
 917                  * For search is a device:
 918                  *     realpath do /dev/mapper/XX => /dev/dm-X
 919                  *     which is required by BTRFS_SCAN_DEV
 920                  * For search is a mountpoint:
 921                  *     realpath do  /mnt/btrfs/  => /mnt/btrfs
 922                  *     which shall be recognized by btrfs_scan_kernel()
 923                  */
 924                 if (realpath(search, path))
 925                         search = path;
 926
 927                 /*
 928                  * Needs special handling if input arg is block dev And if
 929                  * input arg is mount-point just print it right away
 930                  */
 931                 if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
 932                         ret = get_btrfs_mount(search, mp, sizeof(mp));
 933                         if (!ret) {
 934                                 /* given block dev is mounted */
 935                                 search = mp;
 936                                 type = BTRFS_ARG_MNTPOINT;
 937                         } else {
 938                                 ret = dev_to_fsid(search, fsid);
 939                                 if (ret) {
 940                                         fprintf(stderr,
 941                                                 "ERROR: No btrfs on %s\n",
 942                                                 search);
 943                                         return 1;
 944                                 }
 945                                 uuid_unparse(fsid, uuid_buf);
 946                                 search = uuid_buf;
 947                                 type = BTRFS_ARG_UUID;
 948                                 goto devs_only;
 949                         }
 950                 }
 951         }
 952
 953         if (where == BTRFS_SCAN_LBLKID)
 954                 goto devs_only;
 955
 956         /* show mounted btrfs */
 957         ret = btrfs_scan_kernel(search, unit_mode);
 958         if (search && !ret) {
 959                 /* since search is found we are done */
 960                 goto out;
 961         }
 962
 963         /* shows mounted only */
 964         if (where == BTRFS_SCAN_MOUNTED)
 965                 goto out;
 966
 967 devs_only:
 968         ret = btrfs_scan_lblkid();
 969
 970         if (ret) {
 971                 fprintf(stderr, "ERROR: %d while scanning\n", ret);
 972                 return 1;
 973         }
 974
 975         ret = search_umounted_fs_uuids(&all_uuids, search, &found);
 976         if (ret < 0) {
 977                 fprintf(stderr,
 978                         "ERROR: %d while searching target device\n", ret);
 979                 return 1;
 980         }
 981
 982         /*
 983          * The seed/sprout mapping are not detected yet,
 984          * do mapping build for all umounted fs
 985          */
 986         ret = map_seed_devices(&all_uuids);
 987         if (ret) {
 988                 fprintf(stderr,
 989                         "ERROR: %d while mapping seed devices\n", ret);
 990                 return 1;
 991         }
 992
 993         list_for_each_entry(fs_devices, &all_uuids, list)
 994                 print_one_uuid(fs_devices, unit_mode);
 995
 996         if (search && !found)
 997                 ret = 1;
 998
 999         while (!list_empty(&all_uuids)) {
1000                 fs_devices = list_entry(all_uuids.next,
1001                                         struct btrfs_fs_devices, list);
1002                 free_fs_devices(fs_devices);
1003         }
1004 out:
1005         printf("%s\n", PACKAGE_STRING);
1006         free_seen_fsid();
1007         return ret;
1008 }
1009
1010 static const char * const cmd_sync_usage[] = {
1011         "btrfs filesystem sync <path>",
1012         "Force a sync on a filesystem",
1013         NULL
1014 };
1015
1016 static int cmd_sync(int argc, char **argv)
1017 {
1018         int     fd, res, e;
1019         char    *path;
1020         DIR     *dirstream = NULL;
1021
1022         if (check_argc_exact(argc, 2))
1023                 usage(cmd_sync_usage);
1024
1025         path = argv[1];
1026
1027         fd = open_file_or_dir(path, &dirstream);
1028         if (fd < 0) {
1029                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1030                 return 1;
1031         }
1032
1033         printf("FSSync '%s'\n", path);
1034         res = ioctl(fd, BTRFS_IOC_SYNC);
1035         e = errno;
1036         close_file_or_dir(fd, dirstream);
1037         if( res < 0 ){
1038                 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
1039                         path, strerror(e));
1040                 return 1;
1041         }
1042
1043         return 0;
1044 }
1045
1046 static int parse_compress_type(char *s)
1047 {
1048         if (strcmp(optarg, "zlib") == 0)
1049                 return BTRFS_COMPRESS_ZLIB;
1050         else if (strcmp(optarg, "lzo") == 0)
1051                 return BTRFS_COMPRESS_LZO;
1052         else {
1053                 fprintf(stderr, "Unknown compress type %s\n", s);
1054                 exit(1);
1055         };
1056 }
1057
1058 static const char * const cmd_defrag_usage[] = {
1059         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
1060         "Defragment a file or a directory",
1061         "",
1062         "-v             be verbose",
1063         "-r             defragment files recursively",
1064         "-c[zlib,lzo]   compress the file while defragmenting",
1065         "-f             flush data to disk immediately after defragmenting",
1066         "-s start       defragment only from byte onward",
1067         "-l len         defragment only up to len bytes",
1068         "-t size        target extent size hint",
1069         NULL
1070 };
1071
1072 static int do_defrag(int fd, int fancy_ioctl,
1073                 struct btrfs_ioctl_defrag_range_args *range)
1074 {
1075         int ret;
1076
1077         if (!fancy_ioctl)
1078                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
1079         else
1080                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
1081
1082         return ret;
1083 }
1084
1085 static int defrag_global_fancy_ioctl;
1086 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
1087 static int defrag_global_verbose;
1088 static int defrag_global_errors;
1089 static int defrag_callback(const char *fpath, const struct stat *sb,
1090                 int typeflag, struct FTW *ftwbuf)
1091 {
1092         int ret = 0;
1093         int e = 0;
1094         int fd = 0;
1095
1096         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
1097                 if (defrag_global_verbose)
1098                         printf("%s\n", fpath);
1099                 fd = open(fpath, O_RDWR);
1100                 e = errno;
1101                 if (fd < 0)
1102                         goto error;
1103                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1104                 e = errno;
1105                 close(fd);
1106                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1107                         fprintf(stderr, "ERROR: defrag range ioctl not "
1108                                 "supported in this kernel, please try "
1109                                 "without any options.\n");
1110                         defrag_global_errors++;
1111                         return ENOTTY;
1112                 }
1113                 if (ret)
1114                         goto error;
1115         }
1116         return 0;
1117
1118 error:
1119         fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
1120         defrag_global_errors++;
1121         return 0;
1122 }
1123
1124 static int cmd_defrag(int argc, char **argv)
1125 {
1126         int fd;
1127         int flush = 0;
1128         u64 start = 0;
1129         u64 len = (u64)-1;
1130         u64 thresh = 0;
1131         int i;
1132         int recursive = 0;
1133         int ret = 0;
1134         struct btrfs_ioctl_defrag_range_args range;
1135         int e = 0;
1136         int compress_type = BTRFS_COMPRESS_NONE;
1137         DIR *dirstream;
1138
1139         defrag_global_errors = 0;
1140         defrag_global_verbose = 0;
1141         defrag_global_errors = 0;
1142         defrag_global_fancy_ioctl = 0;
1143         optind = 1;
1144         while(1) {
1145                 int c = getopt(argc, argv, "vrc::fs:l:t:");
1146                 if (c < 0)
1147                         break;
1148
1149                 switch(c) {
1150                 case 'c':
1151                         compress_type = BTRFS_COMPRESS_ZLIB;
1152                         if (optarg)
1153                                 compress_type = parse_compress_type(optarg);
1154                         defrag_global_fancy_ioctl = 1;
1155                         break;
1156                 case 'f':
1157                         flush = 1;
1158                         defrag_global_fancy_ioctl = 1;
1159                         break;
1160                 case 'v':
1161                         defrag_global_verbose = 1;
1162                         break;
1163                 case 's':
1164                         start = parse_size(optarg);
1165                         defrag_global_fancy_ioctl = 1;
1166                         break;
1167                 case 'l':
1168                         len = parse_size(optarg);
1169                         defrag_global_fancy_ioctl = 1;
1170                         break;
1171                 case 't':
1172                         thresh = parse_size(optarg);
1173                         if (thresh > (u32)-1) {
1174                                 fprintf(stderr,
1175                         "WARNING: target extent size %llu too big, trimmed to %u",
1176                                         thresh, (u32)-1);
1177                         }
1178                         defrag_global_fancy_ioctl = 1;
1179                         break;
1180                 case 'r':
1181                         recursive = 1;
1182                         break;
1183                 default:
1184                         usage(cmd_defrag_usage);
1185                 }
1186         }
1187
1188         if (check_argc_min(argc - optind, 1))
1189                 usage(cmd_defrag_usage);
1190
1191         memset(&defrag_global_range, 0, sizeof(range));
1192         defrag_global_range.start = start;
1193         defrag_global_range.len = len;
1194         defrag_global_range.extent_thresh = (u32)thresh;
1195         if (compress_type) {
1196                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1197                 defrag_global_range.compress_type = compress_type;
1198         }
1199         if (flush)
1200                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1201
1202         for (i = optind; i < argc; i++) {
1203                 struct stat st;
1204
1205                 dirstream = NULL;
1206                 fd = open_file_or_dir(argv[i], &dirstream);
1207                 if (fd < 0) {
1208                         fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
1209                                         strerror(errno));
1210                         defrag_global_errors++;
1211                         close_file_or_dir(fd, dirstream);
1212                         continue;
1213                 }
1214                 if (fstat(fd, &st)) {
1215                         fprintf(stderr, "ERROR: failed to stat %s - %s\n",
1216                                         argv[i], strerror(errno));
1217                         defrag_global_errors++;
1218                         close_file_or_dir(fd, dirstream);
1219                         continue;
1220                 }
1221                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1222                         fprintf(stderr,
1223                             "ERROR: %s is not a directory or a regular file\n",
1224                             argv[i]);
1225                         defrag_global_errors++;
1226                         close_file_or_dir(fd, dirstream);
1227                         continue;
1228                 }
1229                 if (recursive) {
1230                         if (S_ISDIR(st.st_mode)) {
1231                                 ret = nftw(argv[i], defrag_callback, 10,
1232                                                 FTW_MOUNT | FTW_PHYS);
1233                                 if (ret == ENOTTY)
1234                                         exit(1);
1235                                 /* errors are handled in the callback */
1236                                 ret = 0;
1237                         } else {
1238                                 if (defrag_global_verbose)
1239                                         printf("%s\n", argv[i]);
1240                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1241                                                 &defrag_global_range);
1242                                 e = errno;
1243                         }
1244                 } else {
1245                         if (defrag_global_verbose)
1246                                 printf("%s\n", argv[i]);
1247                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
1248                                         &defrag_global_range);
1249                         e = errno;
1250                 }
1251                 close_file_or_dir(fd, dirstream);
1252                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1253                         fprintf(stderr, "ERROR: defrag range ioctl not "
1254                                 "supported in this kernel, please try "
1255                                 "without any options.\n");
1256                         defrag_global_errors++;
1257                         break;
1258                 }
1259                 if (ret) {
1260                         fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
1261                                 argv[i], strerror(e));
1262                         defrag_global_errors++;
1263                 }
1264         }
1265         if (defrag_global_verbose)
1266                 printf("%s\n", PACKAGE_STRING);
1267         if (defrag_global_errors)
1268                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1269
1270         return !!defrag_global_errors;
1271 }
1272
1273 static const char * const cmd_resize_usage[] = {
1274         "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1275         "Resize a filesystem",
1276         "If 'max' is passed, the filesystem will occupy all available space",
1277         "on the device 'devid'.",
1278         "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1279         NULL
1280 };
1281
1282 static int cmd_resize(int argc, char **argv)
1283 {
1284         struct btrfs_ioctl_vol_args     args;
1285         int     fd, res, len, e;
1286         char    *amount, *path;
1287         DIR     *dirstream = NULL;
1288         struct stat st;
1289
1290         if (check_argc_exact(argc, 3))
1291                 usage(cmd_resize_usage);
1292
1293         amount = argv[1];
1294         path = argv[2];
1295
1296         len = strlen(amount);
1297         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1298                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
1299                         amount);
1300                 return 1;
1301         }
1302
1303         res = stat(path, &st);
1304         if (res < 0) {
1305                 fprintf(stderr, "ERROR: resize: cannot stat %s: %s\n",
1306                                 path, strerror(errno));
1307                 return 1;
1308         }
1309         if (!S_ISDIR(st.st_mode)) {
1310                 fprintf(stderr,
1311                         "ERROR: resize works on mounted filesystems and accepts only\n"
1312                         "directories as argument. Passing file containing a btrfs image\n"
1313                         "would resize the underlying filesystem instead of the image.\n");
1314                 return 1;
1315         }
1316
1317         fd = open_file_or_dir(path, &dirstream);
1318         if (fd < 0) {
1319                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1320                 return 1;
1321         }
1322
1323         printf("Resize '%s' of '%s'\n", path, amount);
1324         memset(&args, 0, sizeof(args));
1325         strncpy_null(args.name, amount);
1326         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1327         e = errno;
1328         close_file_or_dir(fd, dirstream);
1329         if( res < 0 ){
1330                 fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
1331                         path, strerror(e));
1332                 return 1;
1333         } else if (res > 0) {
1334                 const char *err_str = btrfs_err_str(res);
1335
1336                 if (err_str) {
1337                         fprintf(stderr, "ERROR: btrfs error resizing '%s' - %s\n",
1338                                 path, err_str);
1339                 } else {
1340                         fprintf(stderr,
1341                         "ERROR: btrfs error resizing '%s' - unknown btrfs_err_code %d\n",
1342                                 path, res);
1343                 }
1344                 return 1;
1345         }
1346         return 0;
1347 }
1348
1349 static const char * const cmd_label_usage[] = {
1350         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1351         "Get or change the label of a filesystem",
1352         "With one argument, get the label of filesystem on <device>.",
1353         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1354         NULL
1355 };
1356
1357 static int cmd_label(int argc, char **argv)
1358 {
1359         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
1360                 usage(cmd_label_usage);
1361
1362         if (argc > 2) {
1363                 return set_label(argv[1], argv[2]);
1364         } else {
1365                 char label[BTRFS_LABEL_SIZE];
1366                 int ret;
1367
1368                 ret = get_label(argv[1], label);
1369                 if (!ret)
1370                         fprintf(stdout, "%s\n", label);
1371
1372                 return ret;
1373         }
1374 }
1375
1376 static const char filesystem_cmd_group_info[] =
1377 "overall filesystem tasks and information";
1378
1379 const struct cmd_group filesystem_cmd_group = {
1380         filesystem_cmd_group_usage, filesystem_cmd_group_info, {
1381                 { "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
1382                 { "show", cmd_show, cmd_show_usage, NULL, 0 },
1383                 { "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
1384                 { "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
1385                 { "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
1386                 { "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
1387                 { "label", cmd_label, cmd_label_usage, NULL, 0 },
1388                 { "usage", cmd_filesystem_usage,
1389                         cmd_filesystem_usage_usage, NULL, 0 },
1390
1391                 NULL_CMD_STRUCT
1392         }
1393 };
1394
1395 int cmd_filesystem(int argc, char **argv)
1396 {
1397         return handle_command_group(&filesystem_cmd_group, argc, argv);
1398 }