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 #define _XOPEN_SOURCE 500
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <sys/ioctl.h>
  23 #include <errno.h>
  24 #include <uuid/uuid.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <ftw.h>
  28 #include <mntent.h>
  29 #include <linux/limits.h>
  30 #include <getopt.h>
  31
  32 #include "kerncompat.h"
  33 #include "ctree.h"
  34 #include "ioctl.h"
  35 #include "utils.h"
  36 #include "volumes.h"
  37 #include "version.h"
  38 #include "commands.h"
  39 #include "list_sort.h"
  40
  41 static const char * const filesystem_cmd_group_usage[] = {
  42         "btrfs filesystem [<group>] <command> [<args>]",
  43         NULL
  44 };
  45
  46 static const char * const cmd_df_usage[] = {
  47         "btrfs filesystem df <path>",
  48         "Show space usage information for a mount point",
  49         NULL
  50 };
  51
  52 static char *group_type_str(u64 flag)
  53 {
  54         switch (flag & BTRFS_BLOCK_GROUP_TYPE_MASK) {
  55         case BTRFS_BLOCK_GROUP_DATA:
  56                 return "Data";
  57         case BTRFS_BLOCK_GROUP_SYSTEM:
  58                 return "System";
  59         case BTRFS_BLOCK_GROUP_METADATA:
  60                 return "Metadata";
  61         case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
  62                 return "Data+Metadata";
  63         default:
  64                 return "unknown";
  65         }
  66 }
  67
  68 static char *group_profile_str(u64 flag)
  69 {
  70         switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
  71         case 0:
  72                 return "single";
  73         case BTRFS_BLOCK_GROUP_RAID0:
  74                 return "RAID0";
  75         case BTRFS_BLOCK_GROUP_RAID1:
  76                 return "RAID1";
  77         case BTRFS_BLOCK_GROUP_RAID5:
  78                 return "RAID5";
  79         case BTRFS_BLOCK_GROUP_RAID6:
  80                 return "RAID6";
  81         case BTRFS_BLOCK_GROUP_DUP:
  82                 return "DUP";
  83         case BTRFS_BLOCK_GROUP_RAID10:
  84                 return "RAID10";
  85         default:
  86                 return "unknown";
  87         }
  88 }
  89
  90 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
  91 {
  92         u64 count = 0;
  93         int ret, e;
  94         struct btrfs_ioctl_space_args *sargs;
  95
  96         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
  97         if (!sargs)
  98                 return -ENOMEM;
  99
 100         sargs->space_slots = 0;
 101         sargs->total_spaces = 0;
 102
 103         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 104         e = errno;
 105         if (ret) {
 106                 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
 107                         strerror(e));
 108                 free(sargs);
 109                 return ret;
 110         }
 111         if (!sargs->total_spaces) {
 112                 free(sargs);
 113                 return 0;
 114         }
 115         count = sargs->total_spaces;
 116         free(sargs);
 117
 118         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 119                         (count * sizeof(struct btrfs_ioctl_space_info)));
 120         if (!sargs)
 121                 ret = -ENOMEM;
 122
 123         sargs->space_slots = count;
 124         sargs->total_spaces = 0;
 125         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 126         e = errno;
 127         if (ret) {
 128                 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
 129                                 count, strerror(e));
 130                 free(sargs);
 131                 return ret;
 132         }
 133         *sargs_ret = sargs;
 134         return 0;
 135 }
 136
 137 static void print_df(struct btrfs_ioctl_space_args *sargs)
 138 {
 139         u64 i;
 140         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 141
 142         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 143                 printf("%s, %s: total=%s, used=%s\n",
 144                         group_type_str(sp->flags),
 145                         group_profile_str(sp->flags),
 146                         pretty_size(sp->total_bytes),
 147                         pretty_size(sp->used_bytes));
 148         }
 149 }
 150
 151 static int cmd_df(int argc, char **argv)
 152 {
 153         struct btrfs_ioctl_space_args *sargs = NULL;
 154         int ret;
 155         int fd;
 156         char *path;
 157         DIR  *dirstream = NULL;
 158
 159         if (check_argc_exact(argc, 2))
 160                 usage(cmd_df_usage);
 161
 162         path = argv[1];
 163
 164         fd = open_file_or_dir(path, &dirstream);
 165         if (fd < 0) {
 166                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 167                 return 1;
 168         }
 169         ret = get_df(fd, &sargs);
 170
 171         if (!ret && sargs) {
 172                 print_df(sargs);
 173                 free(sargs);
 174         } else {
 175                 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(ret));
 176         }
 177
 178         close_file_or_dir(fd, dirstream);
 179         return !!ret;
 180 }
 181
 182 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 183 {
 184         char uuidbuf[37];
 185         struct list_head *cur;
 186         struct btrfs_device *device;
 187         int search_len = strlen(search);
 188
 189         search_len = min(search_len, 37);
 190         uuid_unparse(fs_devices->fsid, uuidbuf);
 191         if (!strncmp(uuidbuf, search, search_len))
 192                 return 1;
 193
 194         list_for_each(cur, &fs_devices->devices) {
 195                 device = list_entry(cur, struct btrfs_device, dev_list);
 196                 if ((device->label && strcmp(device->label, search) == 0) ||
 197                     strcmp(device->name, search) == 0)
 198                         return 1;
 199         }
 200         return 0;
 201 }
 202
 203 /*
 204  * Sort devices by devid, ascending
 205  */
 206 static int cmp_device_id(void *priv, struct list_head *a,
 207                 struct list_head *b)
 208 {
 209         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 210                         dev_list);
 211         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 212                         dev_list);
 213
 214         return da->devid < db->devid ? -1 :
 215                 da->devid > db->devid ? 1 : 0;
 216 }
 217
 218 static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 219 {
 220         char uuidbuf[37];
 221         struct list_head *cur;
 222         struct btrfs_device *device;
 223         u64 devs_found = 0;
 224         u64 total;
 225
 226         uuid_unparse(fs_devices->fsid, uuidbuf);
 227         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 228                             dev_list);
 229         if (device->label && device->label[0])
 230                 printf("Label: '%s' ", device->label);
 231         else
 232                 printf("Label: none ");
 233
 234
 235         total = device->total_devs;
 236         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 237                (unsigned long long)total,
 238                pretty_size(device->super_bytes_used));
 239
 240         list_sort(NULL, &fs_devices->devices, cmp_device_id);
 241         list_for_each(cur, &fs_devices->devices) {
 242                 device = list_entry(cur, struct btrfs_device, dev_list);
 243
 244                 printf("\tdevid %4llu size %s used %s path %s\n",
 245                        (unsigned long long)device->devid,
 246                        pretty_size(device->total_bytes),
 247                        pretty_size(device->bytes_used), device->name);
 248
 249                 devs_found++;
 250         }
 251         if (devs_found < total) {
 252                 printf("\t*** Some devices missing\n");
 253         }
 254         printf("\n");
 255 }
 256
 257 /* adds up all the used spaces as reported by the space info ioctl
 258  */
 259 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 260 {
 261         u64 ret = 0;
 262         int i;
 263         for (i = 0; i < si->total_spaces; i++)
 264                 ret += si->spaces[i].used_bytes;
 265         return ret;
 266 }
 267
 268 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 269                 struct btrfs_ioctl_dev_info_args *dev_info,
 270                 struct btrfs_ioctl_space_args *space_info,
 271                 char *label, char *path)
 272 {
 273         int i;
 274         char uuidbuf[37];
 275         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 276
 277         uuid_unparse(fs_info->fsid, uuidbuf);
 278         printf("Label: %s  uuid: %s\n",
 279                 strlen(label) ? label : "none", uuidbuf);
 280
 281         printf("\tTotal devices %llu FS bytes used %s\n",
 282                                 fs_info->num_devices,
 283                         pretty_size(calc_used_bytes(space_info)));
 284
 285         for (i = 0; i < fs_info->num_devices; i++) {
 286                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 287                 printf("\tdevid    %llu size %s used %s path %s\n",
 288                         tmp_dev_info->devid,
 289                         pretty_size(tmp_dev_info->total_bytes),
 290                         pretty_size(tmp_dev_info->bytes_used),
 291                         tmp_dev_info->path);
 292         }
 293
 294         printf("\n");
 295         return 0;
 296 }
 297
 298 /* This function checks if the given input parameter is
 299  * an uuid or a path
 300  * return -1: some error in the given input
 301  * return 0: unknow input
 302  * return 1: given input is uuid
 303  * return 2: given input is path
 304  */
 305 static int check_arg_type(char *input)
 306 {
 307         uuid_t  out;
 308         char path[PATH_MAX];
 309
 310         if (!input)
 311                 return BTRFS_ARG_UNKNOWN;
 312
 313         if (realpath(input, path))
 314                 return BTRFS_ARG_PATH;
 315
 316         if (!uuid_parse(input, out))
 317                 return BTRFS_ARG_UUID;
 318
 319         return BTRFS_ARG_UNKNOWN;
 320 }
 321
 322 static int btrfs_scan_kernel(void *search)
 323 {
 324         int ret = 0, fd, type;
 325         FILE *f;
 326         struct mntent *mnt;
 327         struct btrfs_ioctl_fs_info_args fs_info_arg;
 328         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 329         struct btrfs_ioctl_space_args *space_info_arg;
 330         char label[BTRFS_LABEL_SIZE];
 331         uuid_t uuid;
 332
 333         f = setmntent("/proc/self/mounts", "r");
 334         if (f == NULL)
 335                 return 1;
 336
 337         type = check_arg_type(search);
 338
 339         while ((mnt = getmntent(f)) != NULL) {
 340                 if (strcmp(mnt->mnt_type, "btrfs"))
 341                         continue;
 342                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 343                                 &dev_info_arg);
 344                 if (ret)
 345                         return ret;
 346
 347                 switch (type) {
 348                 case BTRFS_ARG_UUID:
 349                         ret = uuid_parse(search, uuid);
 350                         if (ret)
 351                                 return 1;
 352                         if (uuid_compare(fs_info_arg.fsid, uuid))
 353                                 continue;
 354                         break;
 355                 case BTRFS_ARG_PATH:
 356                         if (strcmp(search, mnt->mnt_dir))
 357                                 continue;
 358                         break;
 359                 default:
 360                         break;
 361                 }
 362
 363                 fd = open(mnt->mnt_dir, O_RDONLY);
 364                 if (fd > 0 && !get_df(fd, &space_info_arg)) {
 365                         get_label_mounted(mnt->mnt_dir, label);
 366                         print_one_fs(&fs_info_arg, dev_info_arg,
 367                                         space_info_arg, label, mnt->mnt_dir);
 368                         free(space_info_arg);
 369                 }
 370                 if (fd > 0)
 371                         close(fd);
 372                 free(dev_info_arg);
 373         }
 374         return ret;
 375 }
 376
 377 static const char * const cmd_show_usage[] = {
 378         "btrfs filesystem show [options] [<path>|<uuid>]",
 379         "Show the structure of a filesystem",
 380         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 381         "-m|--mounted       show only mounted btrfs",
 382         "If no argument is given, structure of all present filesystems is shown.",
 383         NULL
 384 };
 385
 386 static int cmd_show(int argc, char **argv)
 387 {
 388         struct list_head *all_uuids;
 389         struct btrfs_fs_devices *fs_devices;
 390         struct list_head *cur_uuid;
 391         char *search = NULL;
 392         int ret;
 393         int where = BTRFS_SCAN_LBLKID;
 394         int type = 0;
 395
 396         while (1) {
 397                 int long_index;
 398                 static struct option long_options[] = {
 399                         { "all-devices", no_argument, NULL, 'd'},
 400                         { "mounted", no_argument, NULL, 'm'},
 401                         { NULL, no_argument, NULL, 0 },
 402                 };
 403                 int c = getopt_long(argc, argv, "dm", long_options,
 404                                         &long_index);
 405                 if (c < 0)
 406                         break;
 407                 switch (c) {
 408                 case 'd':
 409                         where = BTRFS_SCAN_DEV;
 410                         break;
 411                 case 'm':
 412                         where = BTRFS_SCAN_MOUNTED;
 413                         break;
 414                 default:
 415                         usage(cmd_show_usage);
 416                 }
 417         }
 418
 419         if (check_argc_max(argc, optind + 1))
 420                 usage(cmd_show_usage);
 421         if (argc > optind) {
 422                 search = argv[optind];
 423                 type = check_arg_type(search);
 424                 if (type == BTRFS_ARG_UNKNOWN) {
 425                         fprintf(stderr, "ERROR: arg type unknown\n");
 426                         usage(cmd_show_usage);
 427                 }
 428         }
 429
 430         if (where == BTRFS_SCAN_DEV)
 431                 goto devs_only;
 432
 433         /* show mounted btrfs */
 434         btrfs_scan_kernel(search);
 435
 436         /* shows mounted only */
 437         if (where == BTRFS_SCAN_MOUNTED)
 438                 goto out;
 439
 440 devs_only:
 441         ret = scan_for_btrfs(where, !BTRFS_UPDATE_KERNEL);
 442
 443         if (ret) {
 444                 fprintf(stderr, "ERROR: %d while scanning\n", ret);
 445                 return 1;
 446         }
 447
 448         all_uuids = btrfs_scanned_uuids();
 449         list_for_each(cur_uuid, all_uuids) {
 450                 fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
 451                                         list);
 452                 if (search && uuid_search(fs_devices, search) == 0)
 453                         continue;
 454
 455                 print_one_uuid(fs_devices);
 456         }
 457
 458 out:
 459         printf("%s\n", BTRFS_BUILD_VERSION);
 460         return 0;
 461 }
 462
 463 static const char * const cmd_sync_usage[] = {
 464         "btrfs filesystem sync <path>",
 465         "Force a sync on a filesystem",
 466         NULL
 467 };
 468
 469 static int cmd_sync(int argc, char **argv)
 470 {
 471         int     fd, res, e;
 472         char    *path;
 473         DIR     *dirstream = NULL;
 474
 475         if (check_argc_exact(argc, 2))
 476                 usage(cmd_sync_usage);
 477
 478         path = argv[1];
 479
 480         fd = open_file_or_dir(path, &dirstream);
 481         if (fd < 0) {
 482                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 483                 return 1;
 484         }
 485
 486         printf("FSSync '%s'\n", path);
 487         res = ioctl(fd, BTRFS_IOC_SYNC);
 488         e = errno;
 489         close_file_or_dir(fd, dirstream);
 490         if( res < 0 ){
 491                 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
 492                         path, strerror(e));
 493                 return 1;
 494         }
 495
 496         return 0;
 497 }
 498
 499 static int parse_compress_type(char *s)
 500 {
 501         if (strcmp(optarg, "zlib") == 0)
 502                 return BTRFS_COMPRESS_ZLIB;
 503         else if (strcmp(optarg, "lzo") == 0)
 504                 return BTRFS_COMPRESS_LZO;
 505         else {
 506                 fprintf(stderr, "Unknown compress type %s\n", s);
 507                 exit(1);
 508         };
 509 }
 510
 511 static const char * const cmd_defrag_usage[] = {
 512         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
 513         "Defragment a file or a directory",
 514         "",
 515         "-v             be verbose",
 516         "-r             defragment files recursively",
 517         "-c[zlib,lzo]   compress the file while defragmenting",
 518         "-f             flush data to disk immediately after defragmenting",
 519         "-s start       defragment only from byte onward",
 520         "-l len         defragment only up to len bytes",
 521         "-t size        minimal size of file to be considered for defragmenting",
 522         NULL
 523 };
 524
 525 static int do_defrag(int fd, int fancy_ioctl,
 526                 struct btrfs_ioctl_defrag_range_args *range)
 527 {
 528         int ret;
 529
 530         if (!fancy_ioctl)
 531                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
 532         else
 533                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
 534
 535         return ret;
 536 }
 537
 538 static int defrag_global_fancy_ioctl;
 539 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
 540 static int defrag_global_verbose;
 541 static int defrag_global_errors;
 542 static int defrag_callback(const char *fpath, const struct stat *sb,
 543                 int typeflag, struct FTW *ftwbuf)
 544 {
 545         int ret = 0;
 546         int e = 0;
 547         int fd = 0;
 548
 549         if (typeflag == FTW_F) {
 550                 if (defrag_global_verbose)
 551                         printf("%s\n", fpath);
 552                 fd = open(fpath, O_RDWR);
 553                 e = errno;
 554                 if (fd < 0)
 555                         goto error;
 556                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
 557                 e = errno;
 558                 close(fd);
 559                 if (ret && e == ENOTTY) {
 560                         fprintf(stderr, "ERROR: defrag range ioctl not "
 561                                 "supported in this kernel, please try "
 562                                 "without any options.\n");
 563                         defrag_global_errors++;
 564                         return ENOTTY;
 565                 }
 566                 if (ret)
 567                         goto error;
 568         }
 569         return 0;
 570
 571 error:
 572         fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
 573         defrag_global_errors++;
 574         return 0;
 575 }
 576
 577 static int cmd_defrag(int argc, char **argv)
 578 {
 579         int fd;
 580         int flush = 0;
 581         u64 start = 0;
 582         u64 len = (u64)-1;
 583         u32 thresh = 0;
 584         int i;
 585         int recursive = 0;
 586         int ret = 0;
 587         struct btrfs_ioctl_defrag_range_args range;
 588         int e = 0;
 589         int compress_type = BTRFS_COMPRESS_NONE;
 590         DIR *dirstream;
 591
 592         defrag_global_errors = 0;
 593         defrag_global_verbose = 0;
 594         defrag_global_errors = 0;
 595         defrag_global_fancy_ioctl = 0;
 596         optind = 1;
 597         while(1) {
 598                 int c = getopt(argc, argv, "vrc::fs:l:t:");
 599                 if (c < 0)
 600                         break;
 601
 602                 switch(c) {
 603                 case 'c':
 604                         compress_type = BTRFS_COMPRESS_ZLIB;
 605                         if (optarg)
 606                                 compress_type = parse_compress_type(optarg);
 607                         defrag_global_fancy_ioctl = 1;
 608                         break;
 609                 case 'f':
 610                         flush = 1;
 611                         defrag_global_fancy_ioctl = 1;
 612                         break;
 613                 case 'v':
 614                         defrag_global_verbose = 1;
 615                         break;
 616                 case 's':
 617                         start = parse_size(optarg);
 618                         defrag_global_fancy_ioctl = 1;
 619                         break;
 620                 case 'l':
 621                         len = parse_size(optarg);
 622                         defrag_global_fancy_ioctl = 1;
 623                         break;
 624                 case 't':
 625                         thresh = parse_size(optarg);
 626                         defrag_global_fancy_ioctl = 1;
 627                         break;
 628                 case 'r':
 629                         recursive = 1;
 630                         break;
 631                 default:
 632                         usage(cmd_defrag_usage);
 633                 }
 634         }
 635
 636         if (check_argc_min(argc - optind, 1))
 637                 usage(cmd_defrag_usage);
 638
 639         memset(&defrag_global_range, 0, sizeof(range));
 640         defrag_global_range.start = start;
 641         defrag_global_range.len = len;
 642         defrag_global_range.extent_thresh = thresh;
 643         if (compress_type) {
 644                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
 645                 defrag_global_range.compress_type = compress_type;
 646         }
 647         if (flush)
 648                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
 649
 650         for (i = optind; i < argc; i++) {
 651                 dirstream = NULL;
 652                 fd = open_file_or_dir(argv[i], &dirstream);
 653                 if (fd < 0) {
 654                         fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
 655                                         strerror(errno));
 656                         defrag_global_errors++;
 657                         close_file_or_dir(fd, dirstream);
 658                         continue;
 659                 }
 660                 if (recursive) {
 661                         struct stat st;
 662
 663                         fstat(fd, &st);
 664                         if (S_ISDIR(st.st_mode)) {
 665                                 ret = nftw(argv[i], defrag_callback, 10,
 666                                                 FTW_MOUNT | FTW_PHYS);
 667                                 if (ret == ENOTTY)
 668                                         exit(1);
 669                                 /* errors are handled in the callback */
 670                                 ret = 0;
 671                         } else {
 672                                 if (defrag_global_verbose)
 673                                         printf("%s\n", argv[i]);
 674                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
 675                                                 &defrag_global_range);
 676                                 e = errno;
 677                         }
 678                 } else {
 679                         if (defrag_global_verbose)
 680                                 printf("%s\n", argv[i]);
 681                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
 682                                         &defrag_global_range);
 683                         e = errno;
 684                 }
 685                 close_file_or_dir(fd, dirstream);
 686                 if (ret && e == ENOTTY) {
 687                         fprintf(stderr, "ERROR: defrag range ioctl not "
 688                                 "supported in this kernel, please try "
 689                                 "without any options.\n");
 690                         defrag_global_errors++;
 691                         break;
 692                 }
 693                 if (ret) {
 694                         fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
 695                                 argv[i], strerror(e));
 696                         defrag_global_errors++;
 697                 }
 698         }
 699         if (defrag_global_verbose)
 700                 printf("%s\n", BTRFS_BUILD_VERSION);
 701         if (defrag_global_errors)
 702                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
 703
 704         return !!defrag_global_errors;
 705 }
 706
 707 static const char * const cmd_resize_usage[] = {
 708         "btrfs filesystem resize [devid:][+/-]<newsize>[gkm]|[devid:]max <path>",
 709         "Resize a filesystem",
 710         "If 'max' is passed, the filesystem will occupy all available space",
 711         "on the device 'devid'.",
 712         NULL
 713 };
 714
 715 static int cmd_resize(int argc, char **argv)
 716 {
 717         struct btrfs_ioctl_vol_args     args;
 718         int     fd, res, len, e;
 719         char    *amount, *path;
 720         DIR     *dirstream = NULL;
 721
 722         if (check_argc_exact(argc, 3))
 723                 usage(cmd_resize_usage);
 724
 725         amount = argv[1];
 726         path = argv[2];
 727
 728         len = strlen(amount);
 729         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 730                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
 731                         amount);
 732                 return 1;
 733         }
 734
 735         fd = open_file_or_dir(path, &dirstream);
 736         if (fd < 0) {
 737                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 738                 return 1;
 739         }
 740
 741         printf("Resize '%s' of '%s'\n", path, amount);
 742         strncpy_null(args.name, amount);
 743         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
 744         e = errno;
 745         close_file_or_dir(fd, dirstream);
 746         if( res < 0 ){
 747                 fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
 748                         path, strerror(e));
 749                 return 1;
 750         }
 751         return 0;
 752 }
 753
 754 static const char * const cmd_label_usage[] = {
 755         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
 756         "Get or change the label of a filesystem",
 757         "With one argument, get the label of filesystem on <device>.",
 758         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
 759         NULL
 760 };
 761
 762 static int cmd_label(int argc, char **argv)
 763 {
 764         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
 765                 usage(cmd_label_usage);
 766
 767         if (argc > 2)
 768                 return set_label(argv[1], argv[2]);
 769         else
 770                 return get_label(argv[1]);
 771 }
 772
 773 const struct cmd_group filesystem_cmd_group = {
 774         filesystem_cmd_group_usage, NULL, {
 775                 { "df", cmd_df, cmd_df_usage, NULL, 0 },
 776                 { "show", cmd_show, cmd_show_usage, NULL, 0 },
 777                 { "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
 778                 { "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
 779                 { "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
 780                 { "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
 781                 { "label", cmd_label, cmd_label_usage, NULL, 0 },
 782                 NULL_CMD_STRUCT
 783         }
 784 };
 785
 786 int cmd_filesystem(int argc, char **argv)
 787 {
 788         return handle_command_group(&filesystem_cmd_group, argc, argv);
 789 }