btrfs_cmds.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
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/types.h>
  23 #include <dirent.h>
  24 #include <sys/stat.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <libgen.h>
  28 #include <limits.h>
  29 #include <uuid/uuid.h>
  30 #include <ctype.h>
  31
  32 #undef ULONG_MAX
  33
  34 #include "kerncompat.h"
  35 #include "ctree.h"
  36 #include "transaction.h"
  37 #include "utils.h"
  38 #include "version.h"
  39 #include "ioctl.h"
  40 #include "volumes.h"
  41
  42 #include "btrfs_cmds.h"
  43
  44 #ifdef __CHECKER__
  45 #define BLKGETSIZE64 0
  46 #define BTRFS_IOC_SNAP_CREATE 0
  47 #define BTRFS_VOL_NAME_MAX 255
  48 struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
  49 static inline int ioctl(int fd, int define, void *arg) { return 0; }
  50 #endif
  51
  52 /*
  53  * test if path is a subvolume:
  54  * this function return
  55  * 0-> path exists but it is not a subvolume
  56  * 1-> path exists and it is  a subvolume
  57  * -1 -> path is unaccessible
  58  */
  59 static int test_issubvolume(char *path)
  60 {
  61
  62         struct stat     st;
  63         int             res;
  64
  65         res = stat(path, &st);
  66         if(res < 0 )
  67                 return -1;
  68
  69         return (st.st_ino == 256) && S_ISDIR(st.st_mode);
  70
  71 }
  72
  73 /*
  74  * test if path is a directory
  75  * this function return
  76  * 0-> path exists but it is not a directory
  77  * 1-> path exists and it is  a directory
  78  * -1 -> path is unaccessible
  79  */
  80 static int test_isdir(char *path)
  81 {
  82         struct stat     st;
  83         int             res;
  84
  85         res = stat(path, &st);
  86         if(res < 0 )
  87                 return -1;
  88
  89         return S_ISDIR(st.st_mode);
  90
  91 }
  92
  93 static int open_file_or_dir(const char *fname)
  94 {
  95         int ret;
  96         struct stat st;
  97         DIR *dirstream;
  98         int fd;
  99
 100         ret = stat(fname, &st);
 101         if (ret < 0) {
 102                 return -1;
 103         }
 104         if (S_ISDIR(st.st_mode)) {
 105                 dirstream = opendir(fname);
 106                 if (!dirstream) {
 107                         return -2;
 108                 }
 109                 fd = dirfd(dirstream);
 110         } else {
 111                 fd = open(fname, O_RDWR);
 112         }
 113         if (fd < 0) {
 114                 return -3;
 115         }
 116         return fd;
 117 }
 118
 119 static u64 parse_size(char *s)
 120 {
 121         int len = strlen(s);
 122         char c;
 123         u64 mult = 1;
 124
 125         if (!isdigit(s[len - 1])) {
 126                 c = tolower(s[len - 1]);
 127                 switch (c) {
 128                 case 'g':
 129                         mult *= 1024;
 130                 case 'm':
 131                         mult *= 1024;
 132                 case 'k':
 133                         mult *= 1024;
 134                 case 'b':
 135                         break;
 136                 default:
 137                         fprintf(stderr, "Unknown size descriptor %c\n", c);
 138                         exit(1);
 139                 }
 140                 s[len - 1] = '\0';
 141         }
 142         return atoll(s) * mult;
 143 }
 144
 145 int do_defrag(int ac, char **av)
 146 {
 147         int fd;
 148         int compress = 0;
 149         int flush = 0;
 150         u64 start = 0;
 151         u64 len = (u64)-1;
 152         u32 thresh = 0;
 153         int i;
 154         int errors = 0;
 155         int ret = 0;
 156         int verbose = 0;
 157         int fancy_ioctl = 0;
 158         struct btrfs_ioctl_defrag_range_args range;
 159
 160         optind = 1;
 161         while(1) {
 162                 int c = getopt(ac, av, "vcfs:l:t:");
 163                 if (c < 0)
 164                         break;
 165                 switch(c) {
 166                 case 'c':
 167                         compress = 1;
 168                         fancy_ioctl = 1;
 169                         break;
 170                 case 'f':
 171                         flush = 1;
 172                         fancy_ioctl = 1;
 173                         break;
 174                 case 'v':
 175                         verbose = 1;
 176                         break;
 177                 case 's':
 178                         start = parse_size(optarg);
 179                         fancy_ioctl = 1;
 180                         break;
 181                 case 'l':
 182                         len = parse_size(optarg);
 183                         fancy_ioctl = 1;
 184                         break;
 185                 case 't':
 186                         thresh = parse_size(optarg);
 187                         fancy_ioctl = 1;
 188                         break;
 189                 default:
 190                         fprintf(stderr, "Invalid arguments for defragment\n");
 191                         free(av);
 192                         return 1;
 193                 }
 194         }
 195         if (ac - optind == 0) {
 196                 fprintf(stderr, "Invalid arguments for defragment\n");
 197                 free(av);
 198                 return 1;
 199         }
 200
 201         memset(&range, 0, sizeof(range));
 202         range.start = start;
 203         range.len = len;
 204         range.extent_thresh = thresh;
 205         if (compress)
 206                 range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
 207         if (flush)
 208                 range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
 209
 210         for (i = optind; i < ac; i++) {
 211                 if (verbose)
 212                         printf("%s\n", av[i]);
 213                 fd = open_file_or_dir(av[i]);
 214                 if (fd < 0) {
 215                         fprintf(stderr, "failed to open %s\n", av[i]);
 216                         perror("open:");
 217                         errors++;
 218                         continue;
 219                 }
 220                 if (!fancy_ioctl) {
 221                         ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
 222                 } else {
 223                         ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, &range);
 224                         if (ret && errno == ENOTTY) {
 225                                 fprintf(stderr, "defrag range ioctl not "
 226                                         "supported in this kernel, please try "
 227                                         "without any options.\n");
 228                                 errors++;
 229                                 break;
 230                         }
 231                 }
 232                 if (ret) {
 233                         fprintf(stderr, "ioctl failed on %s ret %d errno %d\n",
 234                                 av[i], ret, errno);
 235                         errors++;
 236                 }
 237                 close(fd);
 238         }
 239         if (verbose)
 240                 printf("%s\n", BTRFS_BUILD_VERSION);
 241         if (errors) {
 242                 fprintf(stderr, "total %d failures\n", errors);
 243                 exit(1);
 244         }
 245
 246         free(av);
 247         return errors + 20;
 248 }
 249
 250 int do_find_newer(int argc, char **argv)
 251 {
 252         int fd;
 253         int ret;
 254         char *subvol;
 255         u64 last_gen;
 256
 257         subvol = argv[1];
 258         last_gen = atoll(argv[2]);
 259
 260         ret = test_issubvolume(subvol);
 261         if (ret < 0) {
 262                 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
 263                 return 12;
 264         }
 265         if (!ret) {
 266                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
 267                 return 13;
 268         }
 269
 270         fd = open_file_or_dir(subvol);
 271         if (fd < 0) {
 272                 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
 273                 return 12;
 274         }
 275         ret = find_updated_files(fd, 0, last_gen);
 276         if (ret)
 277                 return 19;
 278         return 0;
 279 }
 280
 281 int do_subvol_list(int argc, char **argv)
 282 {
 283         int fd;
 284         int ret;
 285         char *subvol;
 286
 287         subvol = argv[1];
 288
 289         ret = test_issubvolume(subvol);
 290         if (ret < 0) {
 291                 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
 292                 return 12;
 293         }
 294         if (!ret) {
 295                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
 296                 return 13;
 297         }
 298
 299         fd = open_file_or_dir(subvol);
 300         if (fd < 0) {
 301                 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
 302                 return 12;
 303         }
 304         ret = list_subvols(fd);
 305         if (ret)
 306                 return 19;
 307         return 0;
 308 }
 309
 310 int do_clone(int argc, char **argv)
 311 {
 312         char    *subvol, *dst;
 313         int     res, fd, fddst, len;
 314         char    *newname;
 315         char    *dstdir;
 316
 317         subvol = argv[1];
 318         dst = argv[2];
 319         struct btrfs_ioctl_vol_args     args;
 320
 321         res = test_issubvolume(subvol);
 322         if(res<0){
 323                 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
 324                 return 12;
 325         }
 326         if(!res){
 327                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
 328                 return 13;
 329         }
 330
 331         res = test_isdir(dst);
 332         if(res == 0 ){
 333                 fprintf(stderr, "ERROR: '%s' exists and it is not a directory\n", dst);
 334                 return 12;
 335         }
 336
 337         if(res>0){
 338                 newname = strdup(subvol);
 339                 newname = basename(newname);
 340                 dstdir = dst;
 341         }else{
 342                 newname = strdup(dst);
 343                 newname = basename(newname);
 344                 dstdir = strdup(dst);
 345                 dstdir = dirname(dstdir);
 346         }
 347
 348         if( !strcmp(newname,".") || !strcmp(newname,"..") ||
 349              strchr(newname, '/') ){
 350                 fprintf(stderr, "ERROR: incorrect snapshot name ('%s')\n",
 351                         newname);
 352                 return 14;
 353         }
 354
 355         len = strlen(newname);
 356         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 357                 fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
 358                         newname);
 359                 return 14;
 360         }
 361
 362         fddst = open_file_or_dir(dstdir);
 363         if (fddst < 0) {
 364                 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
 365                 return 12;
 366         }
 367
 368         fd = open_file_or_dir(subvol);
 369         if (fd < 0) {
 370                 close(fddst);
 371                 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
 372                 return 12;
 373         }
 374
 375         printf("Create a snapshot of '%s' in '%s/%s'\n",
 376                subvol, dstdir, newname);
 377         args.fd = fd;
 378         strcpy(args.name, newname);
 379         res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE, &args);
 380
 381         close(fd);
 382         close(fddst);
 383
 384         if(res < 0 ){
 385                 fprintf( stderr, "ERROR: cannot snapshot '%s'\n",subvol);
 386                 return 11;
 387         }
 388
 389         return 0;
 390
 391 }
 392
 393 int do_delete_subvolume(int argc, char **argv)
 394 {
 395         int     res, fd, len;
 396         struct btrfs_ioctl_vol_args     args;
 397         char    *dname, *vname, *cpath;
 398         char    *path = argv[1];
 399
 400         res = test_issubvolume(path);
 401         if(res<0){
 402                 fprintf(stderr, "ERROR: error accessing '%s'\n", path);
 403                 return 12;
 404         }
 405         if(!res){
 406                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
 407                 return 13;
 408         }
 409
 410         cpath = realpath(path, 0);
 411         dname = strdup(cpath);
 412         dname = dirname(dname);
 413         vname = strdup(cpath);
 414         vname = basename(vname);
 415         free(cpath);
 416
 417         if( !strcmp(vname,".") || !strcmp(vname,"..") ||
 418              strchr(vname, '/') ){
 419                 fprintf(stderr, "ERROR: incorrect subvolume name ('%s')\n",
 420                         vname);
 421                 return 14;
 422         }
 423
 424         len = strlen(vname);
 425         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 426                 fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
 427                         vname);
 428                 return 14;
 429         }
 430
 431         fd = open_file_or_dir(dname);
 432         if (fd < 0) {
 433                 close(fd);
 434                 fprintf(stderr, "ERROR: can't access to '%s'\n", dname);
 435                 return 12;
 436         }
 437
 438         printf("Delete subvolume '%s/%s'\n", dname, vname);
 439         strcpy(args.name, vname);
 440         res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
 441
 442         close(fd);
 443
 444         if(res < 0 ){
 445                 fprintf( stderr, "ERROR: cannot delete '%s/%s'\n",dname, vname);
 446                 return 11;
 447         }
 448
 449         return 0;
 450
 451 }
 452
 453 int do_create_subvol(int argc, char **argv)
 454 {
 455         int     res, fddst, len;
 456         char    *newname;
 457         char    *dstdir;
 458         struct btrfs_ioctl_vol_args     args;
 459         char    *dst = argv[1];
 460
 461         res = test_isdir(dst);
 462         if(res >= 0 ){
 463                 fprintf(stderr, "ERROR: '%s' exists\n", dst);
 464                 return 12;
 465         }
 466
 467         newname = strdup(dst);
 468         newname = basename(newname);
 469         dstdir = strdup(dst);
 470         dstdir = dirname(dstdir);
 471
 472         if( !strcmp(newname,".") || !strcmp(newname,"..") ||
 473              strchr(newname, '/') ){
 474                 fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n",
 475                         newname);
 476                 return 14;
 477         }
 478
 479         len = strlen(newname);
 480         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 481                 fprintf(stderr, "ERROR: subvolume name too long ('%s)\n",
 482                         newname);
 483                 return 14;
 484         }
 485
 486         fddst = open_file_or_dir(dstdir);
 487         if (fddst < 0) {
 488                 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
 489                 return 12;
 490         }
 491
 492         printf("Create subvolume '%s/%s'\n", dstdir, newname);
 493         strcpy(args.name, newname);
 494         res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args);
 495
 496         close(fddst);
 497
 498         if(res < 0 ){
 499                 fprintf( stderr, "ERROR: cannot create subvolume\n");
 500                 return 11;
 501         }
 502
 503         return 0;
 504
 505 }
 506
 507 int do_fssync(int argc, char **argv)
 508 {
 509         int fd, res;
 510         char    *path = argv[1];
 511
 512         fd = open_file_or_dir(path);
 513         if (fd < 0) {
 514                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 515                 return 12;
 516         }
 517
 518         printf("FSSync '%s'\n", path);
 519         res = ioctl(fd, BTRFS_IOC_SYNC);
 520         close(fd);
 521         if( res < 0 ){
 522                 fprintf(stderr, "ERROR: unable to fs-syncing '%s'\n", path);
 523                 return 16;
 524         }
 525
 526         return 0;
 527 }
 528
 529 int do_scan(int argc, char **argv)
 530 {
 531         int     i, fd;
 532         if(argc<=1){
 533                 int ret;
 534
 535                 printf("Scanning for Btrfs filesystems\n");
 536                 ret = btrfs_scan_one_dir("/dev", 1);
 537                 if (ret){
 538                         fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 539                         return 18;
 540                 }
 541                 return 0;
 542         }
 543
 544         fd = open("/dev/btrfs-control", O_RDWR);
 545         if (fd < 0) {
 546                 perror("failed to open /dev/btrfs-control");
 547                 return 10;
 548         }
 549
 550         for( i = 1 ; i < argc ; i++ ){
 551                 struct btrfs_ioctl_vol_args args;
 552                 int ret;
 553
 554                 printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);
 555
 556                 strcpy(args.name, argv[i]);
 557                 /*
 558                  * FIXME: which are the error code returned by this ioctl ?
 559                  * it seems that is impossible to understand if there no is
 560                  * a btrfs filesystem from an I/O error !!!
 561                  */
 562                 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
 563
 564                 if( ret < 0 ){
 565                         close(fd);
 566                         fprintf(stderr, "ERROR: unable to scan the device '%s'\n", argv[i]);
 567                         return 11;
 568                 }
 569         }
 570
 571         close(fd);
 572         return 0;
 573
 574 }
 575
 576 int do_resize(int argc, char **argv)
 577 {
 578
 579         struct btrfs_ioctl_vol_args     args;
 580         int     fd, res, len;
 581         char    *amount=argv[1], *path=argv[2];
 582
 583         fd = open_file_or_dir(path);
 584         if (fd < 0) {
 585                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 586                 return 12;
 587         }
 588         len = strlen(amount);
 589         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 590                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
 591                         amount);
 592                 return 14;
 593         }
 594
 595         printf("Resize '%s' of '%s'\n", path, amount);
 596         strcpy(args.name, amount);
 597         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
 598         close(fd);
 599         if( res < 0 ){
 600                 fprintf(stderr, "ERROR: unable to resize '%s'\n", path);
 601                 return 30;
 602         }
 603         return 0;
 604 }
 605
 606 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 607 {
 608         struct list_head *cur;
 609         struct btrfs_device *device;
 610
 611         list_for_each(cur, &fs_devices->devices) {
 612                 device = list_entry(cur, struct btrfs_device, dev_list);
 613                 if ((device->label && strcmp(device->label, search) == 0) ||
 614                     strcmp(device->name, search) == 0)
 615                         return 1;
 616         }
 617         return 0;
 618 }
 619
 620 static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 621 {
 622         char uuidbuf[37];
 623         struct list_head *cur;
 624         struct btrfs_device *device;
 625         char *super_bytes_used;
 626         u64 devs_found = 0;
 627         u64 total;
 628
 629         uuid_unparse(fs_devices->fsid, uuidbuf);
 630         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 631                             dev_list);
 632         if (device->label && device->label[0])
 633                 printf("Label: '%s' ", device->label);
 634         else
 635                 printf("Label: none ");
 636
 637         super_bytes_used = pretty_sizes(device->super_bytes_used);
 638
 639         total = device->total_devs;
 640         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 641                (unsigned long long)total, super_bytes_used);
 642
 643         free(super_bytes_used);
 644
 645         list_for_each(cur, &fs_devices->devices) {
 646                 char *total_bytes;
 647                 char *bytes_used;
 648                 device = list_entry(cur, struct btrfs_device, dev_list);
 649                 total_bytes = pretty_sizes(device->total_bytes);
 650                 bytes_used = pretty_sizes(device->bytes_used);
 651                 printf("\tdevid %4llu size %s used %s path %s\n",
 652                        (unsigned long long)device->devid,
 653                        total_bytes, bytes_used, device->name);
 654                 free(total_bytes);
 655                 free(bytes_used);
 656                 devs_found++;
 657         }
 658         if (devs_found < total) {
 659                 printf("\t*** Some devices missing\n");
 660         }
 661         printf("\n");
 662 }
 663
 664 int do_show_filesystem(int argc, char **argv)
 665 {
 666         struct list_head *all_uuids;
 667         struct btrfs_fs_devices *fs_devices;
 668         struct list_head *cur_uuid;
 669         char *search = argv[1];
 670         int ret;
 671
 672         ret = btrfs_scan_one_dir("/dev", 0);
 673         if (ret){
 674                 fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 675                 return 18;
 676         }
 677
 678         all_uuids = btrfs_scanned_uuids();
 679         list_for_each(cur_uuid, all_uuids) {
 680                 fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
 681                                         list);
 682                 if (search && uuid_search(fs_devices, search) == 0)
 683                         continue;
 684                 print_one_uuid(fs_devices);
 685         }
 686         printf("%s\n", BTRFS_BUILD_VERSION);
 687         return 0;
 688 }
 689
 690 int do_add_volume(int nargs, char **args)
 691 {
 692
 693         char    *mntpnt = args[nargs-1];
 694         int     i, fdmnt, ret=0;
 695
 696
 697         fdmnt = open_file_or_dir(mntpnt);
 698         if (fdmnt < 0) {
 699                 fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
 700                 return 12;
 701         }
 702
 703         for(i=1 ; i < (nargs-1) ; i++ ){
 704                 struct btrfs_ioctl_vol_args ioctl_args;
 705                 int     devfd, res;
 706                 u64 dev_block_count = 0;
 707                 struct stat st;
 708
 709                 devfd = open(args[i], O_RDWR);
 710                 if (!devfd) {
 711                         fprintf(stderr, "ERROR: Unable to open device '%s'\n", args[i]);
 712                         close(devfd);
 713                         ret++;
 714                         continue;
 715                 }
 716                 ret = fstat(devfd, &st);
 717                 if (ret) {
 718                         fprintf(stderr, "ERROR: Unable to stat '%s'\n", args[i]);
 719                         close(devfd);
 720                         ret++;
 721                         continue;
 722                 }
 723                 if (!S_ISBLK(st.st_mode)) {
 724                         fprintf(stderr, "ERROR: '%s' is not a block device\n", args[i]);
 725                         close(devfd);
 726                         ret++;
 727                         continue;
 728                 }
 729
 730                 res = btrfs_prepare_device(devfd, args[i], 1, &dev_block_count);
 731                 if (res) {
 732                         fprintf(stderr, "ERROR: Unable to init '%s'\n", args[i]);
 733                         close(devfd);
 734                         ret++;
 735                         continue;
 736                 }
 737                 close(devfd);
 738
 739                 strcpy(ioctl_args.name, args[i]);
 740                 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
 741                 if(res<0){
 742                         fprintf(stderr, "ERROR: error adding the device '%s'\n", args[i]);
 743                         ret++;
 744                 }
 745
 746         }
 747
 748         close(fdmnt);
 749         if( ret)
 750                 return ret+20;
 751         else
 752                 return 0;
 753
 754 }
 755
 756 int do_balance(int argc, char **argv)
 757 {
 758
 759         int     fdmnt, ret=0;
 760         struct btrfs_ioctl_vol_args args;
 761         char    *path = argv[1];
 762
 763         fdmnt = open_file_or_dir(path);
 764         if (fdmnt < 0) {
 765                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 766                 return 12;
 767         }
 768
 769         memset(&args, 0, sizeof(args));
 770         ret = ioctl(fdmnt, BTRFS_IOC_BALANCE, &args);
 771         close(fdmnt);
 772         if(ret<0){
 773                 fprintf(stderr, "ERROR: balancing '%s'\n", path);
 774
 775                 return 19;
 776         }
 777         return 0;
 778 }
 779 int do_remove_volume(int nargs, char **args)
 780 {
 781
 782         char    *mntpnt = args[nargs-1];
 783         int     i, fdmnt, ret=0;
 784
 785         fdmnt = open_file_or_dir(mntpnt);
 786         if (fdmnt < 0) {
 787                 fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
 788                 return 12;
 789         }
 790
 791         for(i=1 ; i < (nargs-1) ; i++ ){
 792                 struct  btrfs_ioctl_vol_args arg;
 793                 int     res;
 794
 795                 strcpy(arg.name, args[i]);
 796                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 797                 if(res<0){
 798                         fprintf(stderr, "ERROR: error removing the device '%s'\n", args[i]);
 799                         ret++;
 800                 }
 801         }
 802
 803         close(fdmnt);
 804         if( ret)
 805                 return ret+20;
 806         else
 807                 return 0;
 808 }
 809
 810 int do_set_default_subvol(int nargs, char **argv)
 811 {
 812         int     ret=0, fd;
 813         u64     objectid;
 814         char    *path = argv[2];
 815         char    *subvolid = argv[1];
 816
 817         fd = open_file_or_dir(path);
 818         if (fd < 0) {
 819                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 820                 return 12;
 821         }
 822
 823         objectid = (unsigned long long)strtoll(subvolid, NULL, 0);
 824         if (errno == ERANGE) {
 825                 fprintf(stderr, "ERROR: invalid tree id (%s)\n",subvolid);
 826                 return 30;
 827         }
 828         ret = ioctl(fd, BTRFS_IOC_DEFAULT_SUBVOL, &objectid);
 829         close(fd);
 830         if( ret < 0 ){
 831                 fprintf(stderr, "ERROR: unable to set a new default subvolume\n");
 832                 return 30;
 833         }
 834         return 0;
 835 }
 836
 837 int do_df_filesystem(int nargs, char **argv)
 838 {
 839         struct btrfs_ioctl_space_args *sargs;
 840         u64 count = 0, i;
 841         int ret;
 842         int fd;
 843         char *path = argv[1];
 844
 845         fd = open_file_or_dir(path);
 846         if (fd < 0) {
 847                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 848                 return 12;
 849         }
 850
 851         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 852         if (!sargs)
 853                 return -ENOMEM;
 854
 855         sargs->space_slots = 0;
 856         sargs->total_spaces = 0;
 857
 858         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 859         if (ret) {
 860                 free(sargs);
 861                 return ret;
 862         }
 863         if (!sargs->total_spaces)
 864                 return 0;
 865
 866         count = sargs->total_spaces;
 867
 868         sargs = realloc(sargs, sizeof(struct btrfs_ioctl_space_args) +
 869                         (count * sizeof(struct btrfs_ioctl_space_info)));
 870         if (!sargs)
 871                 return -ENOMEM;
 872
 873         sargs->space_slots = count;
 874         sargs->total_spaces = 0;
 875
 876         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 877         if (ret) {
 878                 free(sargs);
 879                 return ret;
 880         }
 881
 882         for (i = 0; i < sargs->total_spaces; i++) {
 883                 char description[80];
 884                 char *total_bytes;
 885                 char *used_bytes;
 886                 int written = 0;
 887                 u64 flags = sargs->spaces[i].flags;
 888
 889                 memset(description, 0, 80);
 890
 891                 if (flags & BTRFS_BLOCK_GROUP_DATA) {
 892                         snprintf(description, 5, "%s", "Data");
 893                         written += 4;
 894                 } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
 895                         snprintf(description, 7, "%s", "System");
 896                         written += 6;
 897                 } else if (flags & BTRFS_BLOCK_GROUP_METADATA) {
 898                         snprintf(description, 9, "%s", "Metadata");
 899                         written += 8;
 900                 }
 901
 902                 if (flags & BTRFS_BLOCK_GROUP_RAID0) {
 903                         snprintf(description+written, 8, "%s", ", RAID0");
 904                         written += 7;
 905                 } else if (flags & BTRFS_BLOCK_GROUP_RAID1) {
 906                         snprintf(description+written, 8, "%s", ", RAID1");
 907                         written += 7;
 908                 } else if (flags & BTRFS_BLOCK_GROUP_DUP) {
 909                         snprintf(description+written, 6, "%s", ", DUP");
 910                         written += 5;
 911                 } else if (flags & BTRFS_BLOCK_GROUP_RAID10) {
 912                         snprintf(description+written, 9, "%s", ", RAID10");
 913                         written += 8;
 914                 }
 915
 916                 total_bytes = pretty_sizes(sargs->spaces[i].total_bytes);
 917                 used_bytes = pretty_sizes(sargs->spaces[i].used_bytes);
 918                 printf("%s: total=%s, used=%s\n", description, total_bytes,
 919                        used_bytes);
 920         }
 921         free(sargs);
 922
 923         return 0;
 924 }