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
  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 add_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         struct seen_fsid *alloc;
  61
  62         if (!seen)
  63                 goto insert;
  64
  65         while (1) {
  66                 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
  67                         return -EEXIST;
  68
  69                 if (!seen->next)
  70                         break;
  71
  72                 seen = seen->next;
  73         }
  74
  75 insert:
  76
  77         alloc = malloc(sizeof(*alloc));
  78         if (!alloc)
  79                 return -ENOMEM;
  80
  81         alloc->next = NULL;
  82         memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
  83
  84         if (seen)
  85                 seen->next = alloc;
  86         else
  87                 seen_fsid_hash[slot] = alloc;
  88
  89         return 0;
  90 }
  91
  92 static void free_seen_fsid(void)
  93 {
  94         int slot;
  95         struct seen_fsid *seen;
  96         struct seen_fsid *next;
  97
  98         for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
  99                 seen = seen_fsid_hash[slot];
 100                 while (seen) {
 101                         next = seen->next;
 102                         free(seen);
 103                         seen = next;
 104                 }
 105                 seen_fsid_hash[slot] = NULL;
 106         }
 107 }
 108
 109 static const char * const filesystem_cmd_group_usage[] = {
 110         "btrfs filesystem [<group>] <command> [<args>]",
 111         NULL
 112 };
 113
 114 static const char * const cmd_df_usage[] = {
 115         "btrfs filesystem df <path>",
 116         "Show space usage information for a mount point",
 117         NULL
 118 };
 119
 120 static char *group_type_str(u64 flag)
 121 {
 122         switch (flag & BTRFS_BLOCK_GROUP_TYPE_MASK) {
 123         case BTRFS_BLOCK_GROUP_DATA:
 124                 return "Data";
 125         case BTRFS_BLOCK_GROUP_SYSTEM:
 126                 return "System";
 127         case BTRFS_BLOCK_GROUP_METADATA:
 128                 return "Metadata";
 129         case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
 130                 return "Data+Metadata";
 131         default:
 132                 return "unknown";
 133         }
 134 }
 135
 136 static char *group_profile_str(u64 flag)
 137 {
 138         switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
 139         case 0:
 140                 return "single";
 141         case BTRFS_BLOCK_GROUP_RAID0:
 142                 return "RAID0";
 143         case BTRFS_BLOCK_GROUP_RAID1:
 144                 return "RAID1";
 145         case BTRFS_BLOCK_GROUP_RAID5:
 146                 return "RAID5";
 147         case BTRFS_BLOCK_GROUP_RAID6:
 148                 return "RAID6";
 149         case BTRFS_BLOCK_GROUP_DUP:
 150                 return "DUP";
 151         case BTRFS_BLOCK_GROUP_RAID10:
 152                 return "RAID10";
 153         default:
 154                 return "unknown";
 155         }
 156 }
 157
 158 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 159 {
 160         u64 count = 0;
 161         int ret, e;
 162         struct btrfs_ioctl_space_args *sargs;
 163
 164         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 165         if (!sargs)
 166                 return -ENOMEM;
 167
 168         sargs->space_slots = 0;
 169         sargs->total_spaces = 0;
 170
 171         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 172         e = errno;
 173         if (ret) {
 174                 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
 175                         strerror(e));
 176                 free(sargs);
 177                 return -e;
 178         }
 179         /* This really should never happen */
 180         if (!sargs->total_spaces) {
 181                 free(sargs);
 182                 return -ENOENT;
 183         }
 184         count = sargs->total_spaces;
 185         free(sargs);
 186
 187         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 188                         (count * sizeof(struct btrfs_ioctl_space_info)));
 189         if (!sargs)
 190                 ret = -ENOMEM;
 191
 192         sargs->space_slots = count;
 193         sargs->total_spaces = 0;
 194         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 195         e = errno;
 196         if (ret) {
 197                 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
 198                                 count, strerror(e));
 199                 free(sargs);
 200                 return -e;
 201         }
 202         *sargs_ret = sargs;
 203         return 0;
 204 }
 205
 206 static void print_df(struct btrfs_ioctl_space_args *sargs)
 207 {
 208         u64 i;
 209         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 210
 211         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 212                 printf("%s, %s: total=%s, used=%s\n",
 213                         group_type_str(sp->flags),
 214                         group_profile_str(sp->flags),
 215                         pretty_size(sp->total_bytes),
 216                         pretty_size(sp->used_bytes));
 217         }
 218 }
 219
 220 static int cmd_df(int argc, char **argv)
 221 {
 222         struct btrfs_ioctl_space_args *sargs = NULL;
 223         int ret;
 224         int fd;
 225         char *path;
 226         DIR  *dirstream = NULL;
 227
 228         if (check_argc_exact(argc, 2))
 229                 usage(cmd_df_usage);
 230
 231         path = argv[1];
 232
 233         fd = open_file_or_dir(path, &dirstream);
 234         if (fd < 0) {
 235                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 236                 return 1;
 237         }
 238         ret = get_df(fd, &sargs);
 239
 240         if (!ret && sargs) {
 241                 print_df(sargs);
 242                 free(sargs);
 243         } else {
 244                 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
 245         }
 246
 247         close_file_or_dir(fd, dirstream);
 248         return !!ret;
 249 }
 250
 251 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
 252                                         char *search)
 253 {
 254         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 255         int search_len = strlen(search);
 256
 257         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 258         uuid_unparse(fsid, uuidbuf);
 259         if (!strncmp(uuidbuf, search, search_len))
 260                 return 1;
 261
 262         if (strlen(label) && strcmp(label, search) == 0)
 263                 return 1;
 264
 265         if (strcmp(mnt, search) == 0)
 266                 return 1;
 267
 268         return 0;
 269 }
 270
 271 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 272 {
 273         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 274         struct list_head *cur;
 275         struct btrfs_device *device;
 276         int search_len = strlen(search);
 277
 278         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 279         uuid_unparse(fs_devices->fsid, uuidbuf);
 280         if (!strncmp(uuidbuf, search, search_len))
 281                 return 1;
 282
 283         list_for_each(cur, &fs_devices->devices) {
 284                 device = list_entry(cur, struct btrfs_device, dev_list);
 285                 if ((device->label && strcmp(device->label, search) == 0) ||
 286                     strcmp(device->name, search) == 0)
 287                         return 1;
 288         }
 289         return 0;
 290 }
 291
 292 /*
 293  * Sort devices by devid, ascending
 294  */
 295 static int cmp_device_id(void *priv, struct list_head *a,
 296                 struct list_head *b)
 297 {
 298         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 299                         dev_list);
 300         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 301                         dev_list);
 302
 303         return da->devid < db->devid ? -1 :
 304                 da->devid > db->devid ? 1 : 0;
 305 }
 306
 307 static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 308 {
 309         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 310         struct list_head *cur;
 311         struct btrfs_device *device;
 312         u64 devs_found = 0;
 313         u64 total;
 314
 315         if (add_seen_fsid(fs_devices->fsid))
 316                 return;
 317
 318         uuid_unparse(fs_devices->fsid, uuidbuf);
 319         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 320                             dev_list);
 321         if (device->label && device->label[0])
 322                 printf("Label: '%s' ", device->label);
 323         else
 324                 printf("Label: none ");
 325
 326
 327         total = device->total_devs;
 328         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 329                (unsigned long long)total,
 330                pretty_size(device->super_bytes_used));
 331
 332         list_sort(NULL, &fs_devices->devices, cmp_device_id);
 333         list_for_each(cur, &fs_devices->devices) {
 334                 device = list_entry(cur, struct btrfs_device, dev_list);
 335
 336                 printf("\tdevid %4llu size %s used %s path %s\n",
 337                        (unsigned long long)device->devid,
 338                        pretty_size(device->total_bytes),
 339                        pretty_size(device->bytes_used), device->name);
 340
 341                 devs_found++;
 342         }
 343         if (devs_found < total) {
 344                 printf("\t*** Some devices missing\n");
 345         }
 346         printf("\n");
 347 }
 348
 349 /* adds up all the used spaces as reported by the space info ioctl
 350  */
 351 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 352 {
 353         u64 ret = 0;
 354         int i;
 355         for (i = 0; i < si->total_spaces; i++)
 356                 ret += si->spaces[i].used_bytes;
 357         return ret;
 358 }
 359
 360 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 361                 struct btrfs_ioctl_dev_info_args *dev_info,
 362                 struct btrfs_ioctl_space_args *space_info,
 363                 char *label, char *path)
 364 {
 365         int i;
 366         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 367         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 368         int ret;
 369
 370         ret = add_seen_fsid(fs_info->fsid);
 371         if (ret == -EEXIST)
 372                 return 0;
 373         else if (ret)
 374                 return ret;
 375
 376         uuid_unparse(fs_info->fsid, uuidbuf);
 377         if (label && strlen(label))
 378                 printf("Label: '%s' ", label);
 379         else
 380                 printf("Label: none ");
 381
 382         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 383                         fs_info->num_devices,
 384                         pretty_size(calc_used_bytes(space_info)));
 385
 386         for (i = 0; i < fs_info->num_devices; i++) {
 387                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 388                 printf("\tdevid %4llu size %s used %s path %s\n",
 389                         tmp_dev_info->devid,
 390                         pretty_size(tmp_dev_info->total_bytes),
 391                         pretty_size(tmp_dev_info->bytes_used),
 392                         tmp_dev_info->path);
 393         }
 394
 395         printf("\n");
 396         return 0;
 397 }
 398
 399 /* This function checks if the given input parameter is
 400  * an uuid or a path
 401  * return -1: some error in the given input
 402  * return 0: unknow input
 403  * return 1: given input is uuid
 404  * return 2: given input is path
 405  */
 406 static int check_arg_type(char *input)
 407 {
 408         uuid_t  out;
 409         char path[PATH_MAX];
 410
 411         if (!input)
 412                 return -EINVAL;
 413
 414         if (realpath(input, path)) {
 415                 if (is_block_device(input) == 1)
 416                         return BTRFS_ARG_BLKDEV;
 417
 418                 if (is_mount_point(input) == 1)
 419                         return BTRFS_ARG_MNTPOINT;
 420
 421                 return BTRFS_ARG_UNKNOWN;
 422         }
 423
 424         if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
 425                 !uuid_parse(input, out))
 426                 return BTRFS_ARG_UUID;
 427
 428         return BTRFS_ARG_UNKNOWN;
 429 }
 430
 431 static int btrfs_scan_kernel(void *search)
 432 {
 433         int ret = 0, fd;
 434         FILE *f;
 435         struct mntent *mnt;
 436         struct btrfs_ioctl_fs_info_args fs_info_arg;
 437         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 438         struct btrfs_ioctl_space_args *space_info_arg;
 439         char label[BTRFS_LABEL_SIZE];
 440
 441         f = setmntent("/proc/self/mounts", "r");
 442         if (f == NULL)
 443                 return 1;
 444
 445         memset(label, 0, sizeof(label));
 446         while ((mnt = getmntent(f)) != NULL) {
 447                 if (strcmp(mnt->mnt_type, "btrfs"))
 448                         continue;
 449                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 450                                 &dev_info_arg);
 451                 if (ret)
 452                         goto out;
 453
 454                 if (get_label_mounted(mnt->mnt_dir, label)) {
 455                         kfree(dev_info_arg);
 456                         ret = 1;
 457                         goto out;
 458                 }
 459                 if (search && !match_search_item_kernel(fs_info_arg.fsid,
 460                                         mnt->mnt_dir, label, search)) {
 461                         kfree(dev_info_arg);
 462                         continue;
 463                 }
 464
 465                 fd = open(mnt->mnt_dir, O_RDONLY);
 466                 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
 467                         print_one_fs(&fs_info_arg, dev_info_arg,
 468                                         space_info_arg, label, mnt->mnt_dir);
 469                         kfree(space_info_arg);
 470                         memset(label, 0, sizeof(label));
 471                 }
 472                 if (fd != -1)
 473                         close(fd);
 474                 kfree(dev_info_arg);
 475                 if (search)
 476                         ret = 0;
 477         }
 478         if (search)
 479                 ret = 1;
 480
 481 out:
 482         endmntent(f);
 483         return ret;
 484 }
 485
 486 static const char * const cmd_show_usage[] = {
 487         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 488         "Show the structure of a filesystem",
 489         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 490         "-m|--mounted       show only mounted btrfs",
 491         "If no argument is given, structure of all present filesystems is shown.",
 492         NULL
 493 };
 494
 495 static int cmd_show(int argc, char **argv)
 496 {
 497         struct list_head *all_uuids;
 498         struct btrfs_fs_devices *fs_devices;
 499         struct list_head *cur_uuid;
 500         char *search = NULL;
 501         int ret;
 502         int where = BTRFS_SCAN_LBLKID;
 503         int type = 0;
 504         char mp[BTRFS_PATH_NAME_MAX + 1];
 505         char path[PATH_MAX];
 506
 507         while (1) {
 508                 int long_index;
 509                 static struct option long_options[] = {
 510                         { "all-devices", no_argument, NULL, 'd'},
 511                         { "mounted", no_argument, NULL, 'm'},
 512                         { NULL, no_argument, NULL, 0 },
 513                 };
 514                 int c = getopt_long(argc, argv, "dm", long_options,
 515                                         &long_index);
 516                 if (c < 0)
 517                         break;
 518                 switch (c) {
 519                 case 'd':
 520                         where = BTRFS_SCAN_DEV;
 521                         break;
 522                 case 'm':
 523                         where = BTRFS_SCAN_MOUNTED;
 524                         break;
 525                 default:
 526                         usage(cmd_show_usage);
 527                 }
 528         }
 529
 530         if (check_argc_max(argc, optind + 1))
 531                 usage(cmd_show_usage);
 532
 533         if (argc > optind) {
 534                 search = argv[optind];
 535                 if (strlen(search) == 0)
 536                         usage(cmd_show_usage);
 537                 type = check_arg_type(search);
 538                 if (type == BTRFS_ARG_BLKDEV) {
 539                         if (where == BTRFS_SCAN_DEV) {
 540                                 /* we need to do this because
 541                                  * legacy BTRFS_SCAN_DEV
 542                                  * provides /dev/dm-x paths
 543                                  */
 544                                 if (realpath(search, path))
 545                                         search = path;
 546                         } else {
 547                                 ret = get_btrfs_mount(search,
 548                                                 mp, sizeof(mp));
 549                                 if (!ret)
 550                                         /* given block dev is mounted*/
 551                                         search = mp;
 552                                 else
 553                                         goto devs_only;
 554                         }
 555                 }
 556         }
 557
 558         if (where == BTRFS_SCAN_DEV)
 559                 goto devs_only;
 560
 561         /* show mounted btrfs */
 562         ret = btrfs_scan_kernel(search);
 563         if (search && !ret)
 564                 return 0;
 565
 566         /* shows mounted only */
 567         if (where == BTRFS_SCAN_MOUNTED)
 568                 goto out;
 569
 570 devs_only:
 571         ret = scan_for_btrfs(where, !BTRFS_UPDATE_KERNEL);
 572
 573         if (ret) {
 574                 fprintf(stderr, "ERROR: %d while scanning\n", ret);
 575                 return 1;
 576         }
 577
 578         all_uuids = btrfs_scanned_uuids();
 579         list_for_each(cur_uuid, all_uuids) {
 580                 fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
 581                                         list);
 582                 if (search && uuid_search(fs_devices, search) == 0)
 583                         continue;
 584
 585                 print_one_uuid(fs_devices);
 586         }
 587
 588 out:
 589         printf("%s\n", BTRFS_BUILD_VERSION);
 590         free_seen_fsid();
 591         return 0;
 592 }
 593
 594 static const char * const cmd_sync_usage[] = {
 595         "btrfs filesystem sync <path>",
 596         "Force a sync on a filesystem",
 597         NULL
 598 };
 599
 600 static int cmd_sync(int argc, char **argv)
 601 {
 602         int     fd, res, e;
 603         char    *path;
 604         DIR     *dirstream = NULL;
 605
 606         if (check_argc_exact(argc, 2))
 607                 usage(cmd_sync_usage);
 608
 609         path = argv[1];
 610
 611         fd = open_file_or_dir(path, &dirstream);
 612         if (fd < 0) {
 613                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 614                 return 1;
 615         }
 616
 617         printf("FSSync '%s'\n", path);
 618         res = ioctl(fd, BTRFS_IOC_SYNC);
 619         e = errno;
 620         close_file_or_dir(fd, dirstream);
 621         if( res < 0 ){
 622                 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
 623                         path, strerror(e));
 624                 return 1;
 625         }
 626
 627         return 0;
 628 }
 629
 630 static int parse_compress_type(char *s)
 631 {
 632         if (strcmp(optarg, "zlib") == 0)
 633                 return BTRFS_COMPRESS_ZLIB;
 634         else if (strcmp(optarg, "lzo") == 0)
 635                 return BTRFS_COMPRESS_LZO;
 636         else {
 637                 fprintf(stderr, "Unknown compress type %s\n", s);
 638                 exit(1);
 639         };
 640 }
 641
 642 static const char * const cmd_defrag_usage[] = {
 643         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
 644         "Defragment a file or a directory",
 645         "",
 646         "-v             be verbose",
 647         "-r             defragment files recursively",
 648         "-c[zlib,lzo]   compress the file while defragmenting",
 649         "-f             flush data to disk immediately after defragmenting",
 650         "-s start       defragment only from byte onward",
 651         "-l len         defragment only up to len bytes",
 652         "-t size        minimal size of file to be considered for defragmenting",
 653         NULL
 654 };
 655
 656 static int do_defrag(int fd, int fancy_ioctl,
 657                 struct btrfs_ioctl_defrag_range_args *range)
 658 {
 659         int ret;
 660
 661         if (!fancy_ioctl)
 662                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
 663         else
 664                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
 665
 666         return ret;
 667 }
 668
 669 static int defrag_global_fancy_ioctl;
 670 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
 671 static int defrag_global_verbose;
 672 static int defrag_global_errors;
 673 static int defrag_callback(const char *fpath, const struct stat *sb,
 674                 int typeflag, struct FTW *ftwbuf)
 675 {
 676         int ret = 0;
 677         int e = 0;
 678         int fd = 0;
 679
 680         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
 681                 if (defrag_global_verbose)
 682                         printf("%s\n", fpath);
 683                 fd = open(fpath, O_RDWR);
 684                 e = errno;
 685                 if (fd < 0)
 686                         goto error;
 687                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
 688                 e = errno;
 689                 close(fd);
 690                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
 691                         fprintf(stderr, "ERROR: defrag range ioctl not "
 692                                 "supported in this kernel, please try "
 693                                 "without any options.\n");
 694                         defrag_global_errors++;
 695                         return ENOTTY;
 696                 }
 697                 if (ret)
 698                         goto error;
 699         }
 700         return 0;
 701
 702 error:
 703         fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
 704         defrag_global_errors++;
 705         return 0;
 706 }
 707
 708 static int cmd_defrag(int argc, char **argv)
 709 {
 710         int fd;
 711         int flush = 0;
 712         u64 start = 0;
 713         u64 len = (u64)-1;
 714         u32 thresh = 0;
 715         int i;
 716         int recursive = 0;
 717         int ret = 0;
 718         struct btrfs_ioctl_defrag_range_args range;
 719         int e = 0;
 720         int compress_type = BTRFS_COMPRESS_NONE;
 721         DIR *dirstream;
 722
 723         defrag_global_errors = 0;
 724         defrag_global_verbose = 0;
 725         defrag_global_errors = 0;
 726         defrag_global_fancy_ioctl = 0;
 727         optind = 1;
 728         while(1) {
 729                 int c = getopt(argc, argv, "vrc::fs:l:t:");
 730                 if (c < 0)
 731                         break;
 732
 733                 switch(c) {
 734                 case 'c':
 735                         compress_type = BTRFS_COMPRESS_ZLIB;
 736                         if (optarg)
 737                                 compress_type = parse_compress_type(optarg);
 738                         defrag_global_fancy_ioctl = 1;
 739                         break;
 740                 case 'f':
 741                         flush = 1;
 742                         defrag_global_fancy_ioctl = 1;
 743                         break;
 744                 case 'v':
 745                         defrag_global_verbose = 1;
 746                         break;
 747                 case 's':
 748                         start = parse_size(optarg);
 749                         defrag_global_fancy_ioctl = 1;
 750                         break;
 751                 case 'l':
 752                         len = parse_size(optarg);
 753                         defrag_global_fancy_ioctl = 1;
 754                         break;
 755                 case 't':
 756                         thresh = parse_size(optarg);
 757                         defrag_global_fancy_ioctl = 1;
 758                         break;
 759                 case 'r':
 760                         recursive = 1;
 761                         break;
 762                 default:
 763                         usage(cmd_defrag_usage);
 764                 }
 765         }
 766
 767         if (check_argc_min(argc - optind, 1))
 768                 usage(cmd_defrag_usage);
 769
 770         memset(&defrag_global_range, 0, sizeof(range));
 771         defrag_global_range.start = start;
 772         defrag_global_range.len = len;
 773         defrag_global_range.extent_thresh = thresh;
 774         if (compress_type) {
 775                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
 776                 defrag_global_range.compress_type = compress_type;
 777         }
 778         if (flush)
 779                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
 780
 781         for (i = optind; i < argc; i++) {
 782                 struct stat st;
 783
 784                 dirstream = NULL;
 785                 fd = open_file_or_dir(argv[i], &dirstream);
 786                 if (fd < 0) {
 787                         fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
 788                                         strerror(errno));
 789                         defrag_global_errors++;
 790                         close_file_or_dir(fd, dirstream);
 791                         continue;
 792                 }
 793                 if (fstat(fd, &st)) {
 794                         fprintf(stderr, "ERROR: failed to stat %s - %s\n",
 795                                         argv[i], strerror(errno));
 796                         defrag_global_errors++;
 797                         close_file_or_dir(fd, dirstream);
 798                         continue;
 799                 }
 800                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
 801                         fprintf(stderr,
 802                             "ERROR: %s is not a directory or a regular file\n",
 803                             argv[i]);
 804                         defrag_global_errors++;
 805                         close_file_or_dir(fd, dirstream);
 806                         continue;
 807                 }
 808                 if (recursive) {
 809                         if (S_ISDIR(st.st_mode)) {
 810                                 ret = nftw(argv[i], defrag_callback, 10,
 811                                                 FTW_MOUNT | FTW_PHYS);
 812                                 if (ret == ENOTTY)
 813                                         exit(1);
 814                                 /* errors are handled in the callback */
 815                                 ret = 0;
 816                         } else {
 817                                 if (defrag_global_verbose)
 818                                         printf("%s\n", argv[i]);
 819                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
 820                                                 &defrag_global_range);
 821                                 e = errno;
 822                         }
 823                 } else {
 824                         if (defrag_global_verbose)
 825                                 printf("%s\n", argv[i]);
 826                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
 827                                         &defrag_global_range);
 828                         e = errno;
 829                 }
 830                 close_file_or_dir(fd, dirstream);
 831                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
 832                         fprintf(stderr, "ERROR: defrag range ioctl not "
 833                                 "supported in this kernel, please try "
 834                                 "without any options.\n");
 835                         defrag_global_errors++;
 836                         break;
 837                 }
 838                 if (ret) {
 839                         fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
 840                                 argv[i], strerror(e));
 841                         defrag_global_errors++;
 842                 }
 843         }
 844         if (defrag_global_verbose)
 845                 printf("%s\n", BTRFS_BUILD_VERSION);
 846         if (defrag_global_errors)
 847                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
 848
 849         return !!defrag_global_errors;
 850 }
 851
 852 static const char * const cmd_resize_usage[] = {
 853         "btrfs filesystem resize [devid:][+/-]<newsize>[gkm]|[devid:]max <path>",
 854         "Resize a filesystem",
 855         "If 'max' is passed, the filesystem will occupy all available space",
 856         "on the device 'devid'.",
 857         NULL
 858 };
 859
 860 static int cmd_resize(int argc, char **argv)
 861 {
 862         struct btrfs_ioctl_vol_args     args;
 863         int     fd, res, len, e;
 864         char    *amount, *path;
 865         DIR     *dirstream = NULL;
 866
 867         if (check_argc_exact(argc, 3))
 868                 usage(cmd_resize_usage);
 869
 870         amount = argv[1];
 871         path = argv[2];
 872
 873         len = strlen(amount);
 874         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 875                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
 876                         amount);
 877                 return 1;
 878         }
 879
 880         fd = open_file_or_dir(path, &dirstream);
 881         if (fd < 0) {
 882                 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
 883                 return 1;
 884         }
 885
 886         printf("Resize '%s' of '%s'\n", path, amount);
 887         strncpy_null(args.name, amount);
 888         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
 889         e = errno;
 890         close_file_or_dir(fd, dirstream);
 891         if( res < 0 ){
 892                 fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
 893                         path, strerror(e));
 894                 return 1;
 895         }
 896         return 0;
 897 }
 898
 899 static const char * const cmd_label_usage[] = {
 900         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
 901         "Get or change the label of a filesystem",
 902         "With one argument, get the label of filesystem on <device>.",
 903         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
 904         NULL
 905 };
 906
 907 static int cmd_label(int argc, char **argv)
 908 {
 909         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
 910                 usage(cmd_label_usage);
 911
 912         if (argc > 2) {
 913                 return set_label(argv[1], argv[2]);
 914         } else {
 915                 char label[BTRFS_LABEL_SIZE];
 916                 int ret;
 917
 918                 ret = get_label(argv[1], label);
 919                 if (!ret)
 920                         fprintf(stdout, "%s\n", label);
 921
 922                 return ret;
 923         }
 924 }
 925
 926 const struct cmd_group filesystem_cmd_group = {
 927         filesystem_cmd_group_usage, NULL, {
 928                 { "df", cmd_df, cmd_df_usage, NULL, 0 },
 929                 { "show", cmd_show, cmd_show_usage, NULL, 0 },
 930                 { "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
 931                 { "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
 932                 { "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
 933                 { "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
 934                 { "label", cmd_label, cmd_label_usage, NULL, 0 },
 935                 NULL_CMD_STRUCT
 936         }
 937 };
 938
 939 int cmd_filesystem(int argc, char **argv)
 940 {
 941         return handle_command_group(&filesystem_cmd_group, argc, argv);
 942 }