cmds-subvolume.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 <sys/stat.h>
  24 #include <libgen.h>
  25 #include <limits.h>
  26 #include <getopt.h>
  27
  28 #include "kerncompat.h"
  29 #include "ioctl.h"
  30 #include "qgroup.h"
  31
  32 #include "ctree.h"
  33 #include "commands.h"
  34 #include "btrfs-list.h"
  35
  36 static const char * const subvolume_cmd_group_usage[] = {
  37         "btrfs subvolume <command> <args>",
  38         NULL
  39 };
  40
  41 /*
  42  * test if path is a directory
  43  * this function return
  44  * 0-> path exists but it is not a directory
  45  * 1-> path exists and it is  a directory
  46  * -1 -> path is unaccessible
  47  */
  48 static int test_isdir(char *path)
  49 {
  50         struct stat     st;
  51         int             res;
  52
  53         res = stat(path, &st);
  54         if(res < 0 )
  55                 return -1;
  56
  57         return S_ISDIR(st.st_mode);
  58 }
  59
  60 static const char * const cmd_subvol_create_usage[] = {
  61         "btrfs subvolume create [<dest>/]<name>",
  62         "Create a subvolume",
  63         "Create a subvolume <name> in <dest>.  If <dest> is not given",
  64         "subvolume <name> will be created in the current directory.",
  65         NULL
  66 };
  67
  68 static int cmd_subvol_create(int argc, char **argv)
  69 {
  70         int     res, fddst, len, e;
  71         char    *newname;
  72         char    *dstdir;
  73         char    *dst;
  74         struct btrfs_qgroup_inherit *inherit = NULL;
  75
  76         optind = 1;
  77         while (1) {
  78                 int c = getopt(argc, argv, "c:i:r");
  79                 if (c < 0)
  80                         break;
  81
  82                 switch (c) {
  83                 case 'c':
  84                         res = qgroup_inherit_add_copy(&inherit, optarg, 0);
  85                         if (res)
  86                                 return res;
  87                         break;
  88                 case 'i':
  89                         res = qgroup_inherit_add_group(&inherit, optarg);
  90                         if (res)
  91                                 return res;
  92                         break;
  93                 default:
  94                         usage(cmd_subvol_create_usage);
  95                 }
  96         }
  97
  98         if (check_argc_exact(argc - optind, 1))
  99                 usage(cmd_subvol_create_usage);
 100
 101         dst = argv[optind];
 102
 103         res = test_isdir(dst);
 104         if(res >= 0 ){
 105                 fprintf(stderr, "ERROR: '%s' exists\n", dst);
 106                 return 12;
 107         }
 108
 109         newname = strdup(dst);
 110         newname = basename(newname);
 111         dstdir = strdup(dst);
 112         dstdir = dirname(dstdir);
 113
 114         if( !strcmp(newname,".") || !strcmp(newname,"..") ||
 115              strchr(newname, '/') ){
 116                 fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n",
 117                         newname);
 118                 return 14;
 119         }
 120
 121         len = strlen(newname);
 122         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 123                 fprintf(stderr, "ERROR: subvolume name too long ('%s)\n",
 124                         newname);
 125                 return 14;
 126         }
 127
 128         fddst = open_file_or_dir(dstdir);
 129         if (fddst < 0) {
 130                 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
 131                 return 12;
 132         }
 133
 134         printf("Create subvolume '%s/%s'\n", dstdir, newname);
 135         if (inherit) {
 136                 struct btrfs_ioctl_vol_args_v2  args;
 137
 138                 memset(&args, 0, sizeof(args));
 139                 strncpy(args.name, newname, BTRFS_SUBVOL_NAME_MAX);
 140                 args.name[BTRFS_SUBVOL_NAME_MAX-1] = 0;
 141                 args.flags |= BTRFS_SUBVOL_QGROUP_INHERIT;
 142                 args.size = qgroup_inherit_size(inherit);
 143                 args.qgroup_inherit = inherit;
 144
 145                 res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE_V2, &args);
 146         } else {
 147                 struct btrfs_ioctl_vol_args     args;
 148
 149                 memset(&args, 0, sizeof(args));
 150                 strncpy(args.name, newname, BTRFS_SUBVOL_NAME_MAX);
 151                 args.name[BTRFS_SUBVOL_NAME_MAX-1] = 0;
 152
 153                 res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args);
 154         }
 155
 156         e = errno;
 157
 158         close(fddst);
 159
 160         if(res < 0 ){
 161                 fprintf( stderr, "ERROR: cannot create subvolume - %s\n",
 162                         strerror(e));
 163                 return 11;
 164         }
 165         free(inherit);
 166
 167         return 0;
 168 }
 169
 170 /*
 171  * test if path is a subvolume:
 172  * this function return
 173  * 0-> path exists but it is not a subvolume
 174  * 1-> path exists and it is  a subvolume
 175  * -1 -> path is unaccessible
 176  */
 177 int test_issubvolume(char *path)
 178 {
 179         struct stat     st;
 180         int             res;
 181
 182         res = stat(path, &st);
 183         if(res < 0 )
 184                 return -1;
 185
 186         return (st.st_ino == 256) && S_ISDIR(st.st_mode);
 187 }
 188
 189 static const char * const cmd_subvol_delete_usage[] = {
 190         "btrfs subvolume delete <subvolume> [<subvolume>...]",
 191         "Delete subvolume(s)",
 192         NULL
 193 };
 194
 195 static int cmd_subvol_delete(int argc, char **argv)
 196 {
 197         int     res, fd, len, e, cnt = 1, ret = 0;
 198         struct btrfs_ioctl_vol_args     args;
 199         char    *dname, *vname, *cpath;
 200         char    *path;
 201
 202         if (argc < 2)
 203                 usage(cmd_subvol_delete_usage);
 204
 205 again:
 206         path = argv[cnt];
 207
 208         res = test_issubvolume(path);
 209         if(res<0){
 210                 fprintf(stderr, "ERROR: error accessing '%s'\n", path);
 211                 ret = 12;
 212                 goto out;
 213         }
 214         if(!res){
 215                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
 216                 ret = 13;
 217                 goto out;
 218         }
 219
 220         cpath = realpath(path, 0);
 221         dname = strdup(cpath);
 222         dname = dirname(dname);
 223         vname = strdup(cpath);
 224         vname = basename(vname);
 225         free(cpath);
 226
 227         if( !strcmp(vname,".") || !strcmp(vname,"..") ||
 228              strchr(vname, '/') ){
 229                 fprintf(stderr, "ERROR: incorrect subvolume name ('%s')\n",
 230                         vname);
 231                 ret = 14;
 232                 goto out;
 233         }
 234
 235         len = strlen(vname);
 236         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 237                 fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
 238                         vname);
 239                 ret = 14;
 240                 goto out;
 241         }
 242
 243         fd = open_file_or_dir(dname);
 244         if (fd < 0) {
 245                 close(fd);
 246                 fprintf(stderr, "ERROR: can't access to '%s'\n", dname);
 247                 ret = 12;
 248                 goto out;
 249         }
 250
 251         printf("Delete subvolume '%s/%s'\n", dname, vname);
 252         strncpy(args.name, vname, BTRFS_PATH_NAME_MAX);
 253         args.name[BTRFS_PATH_NAME_MAX-1] = 0;
 254         res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
 255         e = errno;
 256
 257         close(fd);
 258
 259         if(res < 0 ){
 260                 fprintf( stderr, "ERROR: cannot delete '%s/%s' - %s\n",
 261                         dname, vname, strerror(e));
 262                 ret = 11;
 263                 goto out;
 264         }
 265
 266 out:
 267         cnt++;
 268         if (cnt < argc)
 269                 goto again;
 270
 271         return ret;
 272 }
 273
 274 static const char * const cmd_subvol_list_usage[] = {
 275         "btrfs subvolume list [-apurts] [-g [+|-]value] [-c [+|-]value] "
 276         "[--sort=gen,ogen,rootid,path] <path>",
 277         "List subvolumes (and snapshots)",
 278         "",
 279         "-p           print parent ID",
 280         "-a           print all the subvolumes in the filesystem.",
 281         "-u           print the uuid of subvolumes (and snapshots)",
 282         "-t           print the result as a table",
 283         "-s           list snapshots only in the filesystem",
 284         "-r           list readonly subvolumes (including snapshots)",
 285         "-g [+|-]value",
 286         "             filter the subvolumes by generation",
 287         "             (+value: >= value; -value: <= value; value: = value)",
 288         "-c [+|-]value",
 289         "             filter the subvolumes by ogeneration",
 290         "             (+value: >= value; -value: <= value; value: = value)",
 291         "--sort=gen,ogen,rootid,path",
 292         "             list the subvolume in order of gen, ogen, rootid or path",
 293         "             you also can add '+' or '-' in front of each items.",
 294         "             (+:ascending, -:descending, ascending default)",
 295         NULL,
 296 };
 297
 298 static int cmd_subvol_list(int argc, char **argv)
 299 {
 300         struct btrfs_list_filter_set *filter_set;
 301         struct btrfs_list_comparer_set *comparer_set;
 302         u64 flags = 0;
 303         int fd;
 304         u64 top_id;
 305         int ret;
 306         int c;
 307         char *subvol;
 308         int is_tab_result = 0;
 309         int is_list_all = 0;
 310         struct option long_options[] = {
 311                 {"sort", 1, NULL, 'S'},
 312                 {0, 0, 0, 0}
 313         };
 314
 315         filter_set = btrfs_list_alloc_filter_set();
 316         comparer_set = btrfs_list_alloc_comparer_set();
 317
 318         optind = 1;
 319         while(1) {
 320                 c = getopt_long(argc, argv,
 321                                     "apsurg:c:t", long_options, NULL);
 322                 if (c < 0)
 323                         break;
 324
 325                 switch(c) {
 326                 case 'p':
 327                         btrfs_list_setup_print_column(BTRFS_LIST_PARENT);
 328                         break;
 329                 case 'a':
 330                         is_list_all = 1;
 331                         break;
 332                 case 't':
 333                         is_tab_result = 1;
 334                         break;
 335                 case 's':
 336                         btrfs_list_setup_filter(&filter_set,
 337                                                 BTRFS_LIST_FILTER_SNAPSHOT_ONLY,
 338                                                 0);
 339                         btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION);
 340                         btrfs_list_setup_print_column(BTRFS_LIST_OTIME);
 341
 342                 case 'u':
 343                         btrfs_list_setup_print_column(BTRFS_LIST_UUID);
 344                         break;
 345                 case 'r':
 346                         flags |= BTRFS_ROOT_SUBVOL_RDONLY;
 347                         break;
 348                 case 'g':
 349                         btrfs_list_setup_print_column(BTRFS_LIST_GENERATION);
 350                         ret = btrfs_list_parse_filter_string(optarg,
 351                                                         &filter_set,
 352                                                         BTRFS_LIST_FILTER_GEN);
 353                         if (ret)
 354                                 usage(cmd_subvol_list_usage);
 355                         break;
 356
 357                 case 'c':
 358                         btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION);
 359                         ret = btrfs_list_parse_filter_string(optarg,
 360                                                         &filter_set,
 361                                                         BTRFS_LIST_FILTER_CGEN);
 362                         if (ret)
 363                                 usage(cmd_subvol_list_usage);
 364                         break;
 365                 case 'S':
 366                         ret = btrfs_list_parse_sort_string(optarg,
 367                                                            &comparer_set);
 368                         if (ret)
 369                                 usage(cmd_subvol_list_usage);
 370                         break;
 371
 372                 default:
 373                         usage(cmd_subvol_list_usage);
 374                 }
 375         }
 376
 377         if (flags)
 378                 btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_FLAGS,
 379                                         flags);
 380
 381         if (check_argc_exact(argc - optind, 1))
 382                 usage(cmd_subvol_list_usage);
 383
 384         subvol = argv[optind];
 385
 386         ret = test_issubvolume(subvol);
 387         if (ret < 0) {
 388                 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
 389                 return 12;
 390         }
 391         if (!ret) {
 392                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
 393                 return 13;
 394         }
 395
 396         fd = open_file_or_dir(subvol);
 397         if (fd < 0) {
 398                 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
 399                 return 12;
 400         }
 401
 402         top_id = btrfs_list_get_path_rootid(fd);
 403         if (!is_list_all)
 404                 btrfs_list_setup_filter(&filter_set,
 405                                         BTRFS_LIST_FILTER_TOPID_EQUAL,
 406                                         top_id);
 407
 408         ret = btrfs_list_subvols(fd, filter_set, comparer_set,
 409                                 is_tab_result);
 410         if (ret)
 411                 return 19;
 412         return 0;
 413 }
 414
 415 static const char * const cmd_snapshot_usage[] = {
 416         "btrfs subvolume snapshot [-r] <source> [<dest>/]<name>",
 417         "Create a snapshot of the subvolume",
 418         "Create a writable/readonly snapshot of the subvolume <source> with",
 419         "the name <name> in the <dest> directory",
 420         "",
 421         "-r     create a readonly snapshot",
 422         NULL
 423 };
 424
 425 static int cmd_snapshot(int argc, char **argv)
 426 {
 427         char    *subvol, *dst;
 428         int     res, fd, fddst, len, e, readonly = 0;
 429         char    *newname;
 430         char    *dstdir;
 431         struct btrfs_ioctl_vol_args_v2  args;
 432         struct btrfs_qgroup_inherit *inherit = NULL;
 433
 434         optind = 1;
 435         memset(&args, 0, sizeof(args));
 436         while (1) {
 437                 int c = getopt(argc, argv, "c:i:r");
 438                 if (c < 0)
 439                         break;
 440
 441                 switch (c) {
 442                 case 'c':
 443                         res = qgroup_inherit_add_copy(&inherit, optarg, 0);
 444                         if (res)
 445                                 return res;
 446                         break;
 447                 case 'i':
 448                         res = qgroup_inherit_add_group(&inherit, optarg);
 449                         if (res)
 450                                 return res;
 451                         break;
 452                 case 'r':
 453                         readonly = 1;
 454                         break;
 455                 case 'x':
 456                         res = qgroup_inherit_add_copy(&inherit, optarg, 1);
 457                         if (res)
 458                                 return res;
 459                         break;
 460                 default:
 461                         usage(cmd_snapshot_usage);
 462                 }
 463         }
 464
 465         if (check_argc_exact(argc - optind, 2))
 466                 usage(cmd_snapshot_usage);
 467
 468         subvol = argv[optind];
 469         dst = argv[optind + 1];
 470
 471         res = test_issubvolume(subvol);
 472         if(res<0){
 473                 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
 474                 return 12;
 475         }
 476         if(!res){
 477                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
 478                 return 13;
 479         }
 480
 481         res = test_isdir(dst);
 482         if(res == 0 ){
 483                 fprintf(stderr, "ERROR: '%s' exists and it is not a directory\n", dst);
 484                 return 12;
 485         }
 486
 487         if(res>0){
 488                 newname = strdup(subvol);
 489                 newname = basename(newname);
 490                 dstdir = dst;
 491         }else{
 492                 newname = strdup(dst);
 493                 newname = basename(newname);
 494                 dstdir = strdup(dst);
 495                 dstdir = dirname(dstdir);
 496         }
 497
 498         if( !strcmp(newname,".") || !strcmp(newname,"..") ||
 499              strchr(newname, '/') ){
 500                 fprintf(stderr, "ERROR: incorrect snapshot name ('%s')\n",
 501                         newname);
 502                 return 14;
 503         }
 504
 505         len = strlen(newname);
 506         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 507                 fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
 508                         newname);
 509                 return 14;
 510         }
 511
 512         fddst = open_file_or_dir(dstdir);
 513         if (fddst < 0) {
 514                 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
 515                 return 12;
 516         }
 517
 518         fd = open_file_or_dir(subvol);
 519         if (fd < 0) {
 520                 close(fddst);
 521                 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
 522                 return 12;
 523         }
 524
 525         if (readonly) {
 526                 args.flags |= BTRFS_SUBVOL_RDONLY;
 527                 printf("Create a readonly snapshot of '%s' in '%s/%s'\n",
 528                        subvol, dstdir, newname);
 529         } else {
 530                 printf("Create a snapshot of '%s' in '%s/%s'\n",
 531                        subvol, dstdir, newname);
 532         }
 533
 534         args.fd = fd;
 535         if (inherit) {
 536                 args.flags |= BTRFS_SUBVOL_QGROUP_INHERIT;
 537                 args.size = qgroup_inherit_size(inherit);
 538                 args.qgroup_inherit = inherit;
 539         }
 540         strncpy(args.name, newname, BTRFS_SUBVOL_NAME_MAX);
 541         args.name[BTRFS_SUBVOL_NAME_MAX-1] = 0;
 542         res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE_V2, &args);
 543         e = errno;
 544
 545         close(fd);
 546         close(fddst);
 547
 548         if(res < 0 ){
 549                 fprintf( stderr, "ERROR: cannot snapshot '%s' - %s\n",
 550                         subvol, strerror(e));
 551                 return 11;
 552         }
 553         free(inherit);
 554
 555         return 0;
 556 }
 557
 558 static const char * const cmd_subvol_get_default_usage[] = {
 559         "btrfs subvolume get-default <path>",
 560         "Get the default subvolume of a filesystem",
 561         NULL
 562 };
 563
 564 static int cmd_subvol_get_default(int argc, char **argv)
 565 {
 566         int fd;
 567         int ret;
 568         char *subvol;
 569         struct btrfs_list_filter_set *filter_set;
 570         u64 default_id;
 571
 572         if (check_argc_exact(argc, 2))
 573                 usage(cmd_subvol_get_default_usage);
 574
 575         subvol = argv[1];
 576
 577         ret = test_issubvolume(subvol);
 578         if (ret < 0) {
 579                 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
 580                 return 12;
 581         }
 582         if (!ret) {
 583                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
 584                 return 13;
 585         }
 586
 587         fd = open_file_or_dir(subvol);
 588         if (fd < 0) {
 589                 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
 590                 return 12;
 591         }
 592
 593         ret = btrfs_list_get_default_subvolume(fd, &default_id);
 594         if (ret) {
 595                 fprintf(stderr, "ERROR: can't perform the search - %s\n",
 596                         strerror(errno));
 597                 return ret;
 598         }
 599
 600         if (default_id == 0) {
 601                 fprintf(stderr, "ERROR: 'default' dir item not found\n");
 602                 return ret;
 603         }
 604
 605         /* no need to resolve roots if FS_TREE is default */
 606         if (default_id == BTRFS_FS_TREE_OBJECTID) {
 607                 printf("ID 5 (FS_TREE)\n");
 608                 return ret;
 609         }
 610
 611         filter_set = btrfs_list_alloc_filter_set();
 612         btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_ROOTID,
 613                                 default_id);
 614
 615         ret = btrfs_list_subvols(fd, filter_set, NULL, 0);
 616         if (ret)
 617                 return 19;
 618         return 0;
 619 }
 620
 621 static const char * const cmd_subvol_set_default_usage[] = {
 622         "btrfs subvolume set-default <subvolid> <path>",
 623         "Set the default subvolume of a filesystem",
 624         NULL
 625 };
 626
 627 static int cmd_subvol_set_default(int argc, char **argv)
 628 {
 629         int     ret=0, fd, e;
 630         u64     objectid;
 631         char    *path;
 632         char    *subvolid;
 633
 634         if (check_argc_exact(argc, 3))
 635                 usage(cmd_subvol_set_default_usage);
 636
 637         subvolid = argv[1];
 638         path = argv[2];
 639
 640         fd = open_file_or_dir(path);
 641         if (fd < 0) {
 642                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 643                 return 12;
 644         }
 645
 646         objectid = (unsigned long long)strtoll(subvolid, NULL, 0);
 647         if (errno == ERANGE) {
 648                 fprintf(stderr, "ERROR: invalid tree id (%s)\n",subvolid);
 649                 return 30;
 650         }
 651         ret = ioctl(fd, BTRFS_IOC_DEFAULT_SUBVOL, &objectid);
 652         e = errno;
 653         close(fd);
 654         if( ret < 0 ){
 655                 fprintf(stderr, "ERROR: unable to set a new default subvolume - %s\n",
 656                         strerror(e));
 657                 return 30;
 658         }
 659         return 0;
 660 }
 661
 662 static const char * const cmd_find_new_usage[] = {
 663         "btrfs subvolume find-new <path> <lastgen>",
 664         "List the recently modified files in a filesystem",
 665         NULL
 666 };
 667
 668 static int cmd_find_new(int argc, char **argv)
 669 {
 670         int fd;
 671         int ret;
 672         char *subvol;
 673         u64 last_gen;
 674
 675         if (check_argc_exact(argc, 3))
 676                 usage(cmd_find_new_usage);
 677
 678         subvol = argv[1];
 679         last_gen = atoll(argv[2]);
 680
 681         ret = test_issubvolume(subvol);
 682         if (ret < 0) {
 683                 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
 684                 return 12;
 685         }
 686         if (!ret) {
 687                 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
 688                 return 13;
 689         }
 690
 691         fd = open_file_or_dir(subvol);
 692         if (fd < 0) {
 693                 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
 694                 return 12;
 695         }
 696         ret = btrfs_list_find_updated_files(fd, 0, last_gen);
 697         if (ret)
 698                 return 19;
 699         return 0;
 700 }
 701
 702 const struct cmd_group subvolume_cmd_group = {
 703         subvolume_cmd_group_usage, NULL, {
 704                 { "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0 },
 705                 { "delete", cmd_subvol_delete, cmd_subvol_delete_usage, NULL, 0 },
 706                 { "list", cmd_subvol_list, cmd_subvol_list_usage, NULL, 0 },
 707                 { "snapshot", cmd_snapshot, cmd_snapshot_usage, NULL, 0 },
 708                 { "get-default", cmd_subvol_get_default,
 709                         cmd_subvol_get_default_usage, NULL, 0 },
 710                 { "set-default", cmd_subvol_set_default,
 711                         cmd_subvol_set_default_usage, NULL, 0 },
 712                 { "find-new", cmd_find_new, cmd_find_new_usage, NULL, 0 },
 713                 { 0, 0, 0, 0, 0 }
 714         }
 715 };
 716
 717 int cmd_subvolume(int argc, char **argv)
 718 {
 719         return handle_command_group(&subvolume_cmd_group, argc, argv);
 720 }