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 #include "disk-io.h"
  41
  42
  43 /*
  44  * for btrfs fi show, we maintain a hash of fsids we've already printed.
  45  * This way we don't print dups if a given FS is mounted more than once.
  46  */
  47 #define SEEN_FSID_HASH_SIZE 256
  48
  49 struct seen_fsid {
  50         u8 fsid[BTRFS_FSID_SIZE];
  51         struct seen_fsid *next;
  52 };
  53
  54 static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
  55
  56 static int is_seen_fsid(u8 *fsid)
  57 {
  58         u8 hash = fsid[0];
  59         int slot = hash % SEEN_FSID_HASH_SIZE;
  60         struct seen_fsid *seen = seen_fsid_hash[slot];
  61
  62         return seen ? 1 : 0;
  63 }
  64
  65 static int add_seen_fsid(u8 *fsid)
  66 {
  67         u8 hash = fsid[0];
  68         int slot = hash % SEEN_FSID_HASH_SIZE;
  69         struct seen_fsid *seen = seen_fsid_hash[slot];
  70         struct seen_fsid *alloc;
  71
  72         if (!seen)
  73                 goto insert;
  74
  75         while (1) {
  76                 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
  77                         return -EEXIST;
  78
  79                 if (!seen->next)
  80                         break;
  81
  82                 seen = seen->next;
  83         }
  84
  85 insert:
  86
  87         alloc = malloc(sizeof(*alloc));
  88         if (!alloc)
  89                 return -ENOMEM;
  90
  91         alloc->next = NULL;
  92         memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
  93
  94         if (seen)
  95                 seen->next = alloc;
  96         else
  97                 seen_fsid_hash[slot] = alloc;
  98
  99         return 0;
 100 }
 101
 102 static void free_seen_fsid(void)
 103 {
 104         int slot;
 105         struct seen_fsid *seen;
 106         struct seen_fsid *next;
 107
 108         for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
 109                 seen = seen_fsid_hash[slot];
 110                 while (seen) {
 111                         next = seen->next;
 112                         free(seen);
 113                         seen = next;
 114                 }
 115                 seen_fsid_hash[slot] = NULL;
 116         }
 117 }
 118
 119 static const char * const filesystem_cmd_group_usage[] = {
 120         "btrfs filesystem [<group>] <command> [<args>]",
 121         NULL
 122 };
 123
 124 static const char * const cmd_df_usage[] = {
 125        "btrfs filesystem df [options] <path>",
 126        "Show space usage information for a mount point",
 127         "-b|--raw           raw numbers in bytes",
 128         "-h                 human friendly numbers, base 1024 (default)",
 129         "-H                 human friendly numbers, base 1000",
 130         "--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",
 131         "--si               use 1000 as a base (kB, mB, gB, tB)",
 132         "-k|--kbytes        show sizes in KiB, or kB with --si",
 133         "-m|--mbytes        show sizes in MiB, or mB with --si",
 134         "-g|--gbytes        show sizes in GiB, or gB with --si",
 135         "-t|--tbytes        show sizes in TiB, or tB with --si",
 136        NULL
 137 };
 138
 139 static char *group_type_str(u64 flag)
 140 {
 141         u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
 142                 BTRFS_SPACE_INFO_GLOBAL_RSV;
 143
 144         switch (flag & mask) {
 145         case BTRFS_BLOCK_GROUP_DATA:
 146                 return "Data";
 147         case BTRFS_BLOCK_GROUP_SYSTEM:
 148                 return "System";
 149         case BTRFS_BLOCK_GROUP_METADATA:
 150                 return "Metadata";
 151         case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
 152                 return "Data+Metadata";
 153         case BTRFS_SPACE_INFO_GLOBAL_RSV:
 154                 return "GlobalReserve";
 155         default:
 156                 return "unknown";
 157         }
 158 }
 159
 160 static char *group_profile_str(u64 flag)
 161 {
 162         switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
 163         case 0:
 164                 return "single";
 165         case BTRFS_BLOCK_GROUP_RAID0:
 166                 return "RAID0";
 167         case BTRFS_BLOCK_GROUP_RAID1:
 168                 return "RAID1";
 169         case BTRFS_BLOCK_GROUP_RAID5:
 170                 return "RAID5";
 171         case BTRFS_BLOCK_GROUP_RAID6:
 172                 return "RAID6";
 173         case BTRFS_BLOCK_GROUP_DUP:
 174                 return "DUP";
 175         case BTRFS_BLOCK_GROUP_RAID10:
 176                 return "RAID10";
 177         default:
 178                 return "unknown";
 179         }
 180 }
 181
 182 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 183 {
 184         u64 count = 0;
 185         int ret, e;
 186         struct btrfs_ioctl_space_args *sargs;
 187
 188         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 189         if (!sargs)
 190                 return -ENOMEM;
 191
 192         sargs->space_slots = 0;
 193         sargs->total_spaces = 0;
 194
 195         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 196         e = errno;
 197         if (ret) {
 198                 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
 199                         strerror(e));
 200                 free(sargs);
 201                 return -e;
 202         }
 203         /* This really should never happen */
 204         if (!sargs->total_spaces) {
 205                 free(sargs);
 206                 return -ENOENT;
 207         }
 208         count = sargs->total_spaces;
 209         free(sargs);
 210
 211         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 212                         (count * sizeof(struct btrfs_ioctl_space_info)));
 213         if (!sargs)
 214                 return -ENOMEM;
 215
 216         sargs->space_slots = count;
 217         sargs->total_spaces = 0;
 218         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 219         e = errno;
 220         if (ret) {
 221                 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
 222                                 count, strerror(e));
 223                 free(sargs);
 224                 return -e;
 225         }
 226         *sargs_ret = sargs;
 227         return 0;
 228 }
 229
 230 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
 231 {
 232         u64 i;
 233         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 234
 235         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 236                 printf("%s, %s: total=%s, used=%s\n",
 237                         group_type_str(sp->flags),
 238                         group_profile_str(sp->flags),
 239                         pretty_size_mode(sp->total_bytes, unit_mode),
 240                         pretty_size_mode(sp->used_bytes, unit_mode));
 241         }
 242 }
 243
 244 static int cmd_df(int argc, char **argv)
 245 {
 246         struct btrfs_ioctl_space_args *sargs = NULL;
 247         int ret;
 248         int fd;
 249         char *path;
 250         DIR *dirstream = NULL;
 251         unsigned unit_mode = UNITS_DEFAULT;
 252
 253         while (1) {
 254                 int long_index;
 255                 static const struct option long_options[] = {
 256                         { "raw", no_argument, NULL, 'b'},
 257                         { "kbytes", no_argument, NULL, 'k'},
 258                         { "mbytes", no_argument, NULL, 'm'},
 259                         { "gbytes", no_argument, NULL, 'g'},
 260                         { "tbytes", no_argument, NULL, 't'},
 261                         { "si", no_argument, NULL, 256},
 262                         { "iec", no_argument, NULL, 257},
 263                 };
 264                 int c = getopt_long(argc, argv, "bhHkmgt", long_options,
 265                                         &long_index);
 266                 if (c < 0)
 267                         break;
 268                 switch (c) {
 269                 case 'b':
 270                         unit_mode = UNITS_RAW;
 271                         break;
 272                 case 'k':
 273                         units_set_base(&unit_mode, UNITS_KBYTES);
 274                         break;
 275                 case 'm':
 276                         units_set_base(&unit_mode, UNITS_MBYTES);
 277                         break;
 278                 case 'g':
 279                         units_set_base(&unit_mode, UNITS_GBYTES);
 280                         break;
 281                 case 't':
 282                         units_set_base(&unit_mode, UNITS_TBYTES);
 283                         break;
 284                 case 'h':
 285                         unit_mode = UNITS_HUMAN_BINARY;
 286                         break;
 287                 case 'H':
 288                         unit_mode = UNITS_HUMAN_DECIMAL;
 289                         break;
 290                 case 256:
 291                         units_set_mode(&unit_mode, UNITS_DECIMAL);
 292                         break;
 293                 case 257:
 294                         units_set_mode(&unit_mode, UNITS_BINARY);
 295                         break;
 296                 default:
 297                         usage(cmd_df_usage);
 298                 }
 299         }
 300
 301         if (check_argc_exact(argc, optind + 1))
 302                 usage(cmd_df_usage);
 303
 304         path = argv[optind];
 305
 306         fd = open_file_or_dir(path, &dirstream);
 307         if (fd < 0) {
 308                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 309                 return 1;
 310         }
 311         ret = get_df(fd, &sargs);
 312
 313         if (ret == 0) {
 314                 print_df(sargs, unit_mode);
 315                 free(sargs);
 316         } else {
 317                 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
 318         }
 319
 320         close_file_or_dir(fd, dirstream);
 321         return !!ret;
 322 }
 323
 324 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
 325                                         char *search)
 326 {
 327         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 328         int search_len = strlen(search);
 329
 330         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 331         uuid_unparse(fsid, uuidbuf);
 332         if (!strncmp(uuidbuf, search, search_len))
 333                 return 1;
 334
 335         if (strlen(label) && strcmp(label, search) == 0)
 336                 return 1;
 337
 338         if (strcmp(mnt, search) == 0)
 339                 return 1;
 340
 341         return 0;
 342 }
 343
 344 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 345 {
 346         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 347         struct list_head *cur;
 348         struct btrfs_device *device;
 349         int search_len = strlen(search);
 350
 351         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 352         uuid_unparse(fs_devices->fsid, uuidbuf);
 353         if (!strncmp(uuidbuf, search, search_len))
 354                 return 1;
 355
 356         list_for_each(cur, &fs_devices->devices) {
 357                 device = list_entry(cur, struct btrfs_device, dev_list);
 358                 if ((device->label && strcmp(device->label, search) == 0) ||
 359                     strcmp(device->name, search) == 0)
 360                         return 1;
 361         }
 362         return 0;
 363 }
 364
 365 /*
 366  * Sort devices by devid, ascending
 367  */
 368 static int cmp_device_id(void *priv, struct list_head *a,
 369                 struct list_head *b)
 370 {
 371         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 372                         dev_list);
 373         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 374                         dev_list);
 375
 376         return da->devid < db->devid ? -1 :
 377                 da->devid > db->devid ? 1 : 0;
 378 }
 379
 380 static void splice_device_list(struct list_head *seed_devices,
 381                                struct list_head *all_devices)
 382 {
 383         struct btrfs_device *in_all, *next_all;
 384         struct btrfs_device *in_seed, *next_seed;
 385
 386         list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
 387                 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
 388                                                                 dev_list) {
 389                         if (in_all->devid == in_seed->devid) {
 390                                 /*
 391                                  * When do dev replace in a sprout fs
 392                                  * to a dev in its seed fs, the replacing
 393                                  * dev will reside in the sprout fs and
 394                                  * the replaced dev will still exist
 395                                  * in the seed fs.
 396                                  * So pick the latest one when showing
 397                                  * the sprout fs.
 398                                  */
 399                                 if (in_all->generation
 400                                                 < in_seed->generation) {
 401                                         list_del(&in_all->dev_list);
 402                                         free(in_all);
 403                                 } else if (in_all->generation
 404                                                 > in_seed->generation) {
 405                                         list_del(&in_seed->dev_list);
 406                                         free(in_seed);
 407                                 }
 408                                 break;
 409                         }
 410                 }
 411         }
 412
 413         list_splice(seed_devices, all_devices);
 414 }
 415
 416 static void print_devices(struct btrfs_fs_devices *fs_devices,
 417                           u64 *devs_found)
 418 {
 419         struct btrfs_device *device;
 420         struct btrfs_fs_devices *cur_fs;
 421         struct list_head *all_devices;
 422
 423         all_devices = &fs_devices->devices;
 424         cur_fs = fs_devices->seed;
 425         /* add all devices of seed fs to the fs to be printed */
 426         while (cur_fs) {
 427                 splice_device_list(&cur_fs->devices, all_devices);
 428                 cur_fs = cur_fs->seed;
 429         }
 430
 431         list_sort(NULL, all_devices, cmp_device_id);
 432         list_for_each_entry(device, all_devices, dev_list) {
 433                 printf("\tdevid %4llu size %s used %s path %s\n",
 434                        (unsigned long long)device->devid,
 435                        pretty_size(device->total_bytes),
 436                        pretty_size(device->bytes_used), device->name);
 437
 438                 (*devs_found)++;
 439         }
 440 }
 441
 442 static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 443 {
 444         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 445         struct btrfs_device *device;
 446         u64 devs_found = 0;
 447         u64 total;
 448
 449         if (add_seen_fsid(fs_devices->fsid))
 450                 return;
 451
 452         uuid_unparse(fs_devices->fsid, uuidbuf);
 453         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 454                             dev_list);
 455         if (device->label && device->label[0])
 456                 printf("Label: '%s' ", device->label);
 457         else
 458                 printf("Label: none ");
 459
 460         total = device->total_devs;
 461         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 462                (unsigned long long)total,
 463                pretty_size(device->super_bytes_used));
 464
 465         print_devices(fs_devices, &devs_found);
 466
 467         if (devs_found < total) {
 468                 printf("\t*** Some devices missing\n");
 469         }
 470         printf("\n");
 471 }
 472
 473 /* adds up all the used spaces as reported by the space info ioctl
 474  */
 475 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 476 {
 477         u64 ret = 0;
 478         int i;
 479         for (i = 0; i < si->total_spaces; i++)
 480                 ret += si->spaces[i].used_bytes;
 481         return ret;
 482 }
 483
 484 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 485                 struct btrfs_ioctl_dev_info_args *dev_info,
 486                 struct btrfs_ioctl_space_args *space_info,
 487                 char *label, char *path)
 488 {
 489         int i;
 490         int fd;
 491         int missing = 0;
 492         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 493         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 494         int ret;
 495
 496         ret = add_seen_fsid(fs_info->fsid);
 497         if (ret == -EEXIST)
 498                 return 0;
 499         else if (ret)
 500                 return ret;
 501
 502         uuid_unparse(fs_info->fsid, uuidbuf);
 503         if (label && strlen(label))
 504                 printf("Label: '%s' ", label);
 505         else
 506                 printf("Label: none ");
 507
 508         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 509                         fs_info->num_devices,
 510                         pretty_size(calc_used_bytes(space_info)));
 511
 512         for (i = 0; i < fs_info->num_devices; i++) {
 513                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 514
 515                 /* Add check for missing devices even mounted */
 516                 fd = open((char *)tmp_dev_info->path, O_RDONLY);
 517                 if (fd < 0) {
 518                         missing = 1;
 519                         continue;
 520                 }
 521                 close(fd);
 522                 printf("\tdevid %4llu size %s used %s path %s\n",
 523                         tmp_dev_info->devid,
 524                         pretty_size(tmp_dev_info->total_bytes),
 525                         pretty_size(tmp_dev_info->bytes_used),
 526                         tmp_dev_info->path);
 527         }
 528
 529         if (missing)
 530                 printf("\t*** Some devices missing\n");
 531         printf("\n");
 532         return 0;
 533 }
 534
 535 /* This function checks if the given input parameter is
 536  * an uuid or a path
 537  * return -1: some error in the given input
 538  * return 0: unknow input
 539  * return 1: given input is uuid
 540  * return 2: given input is path
 541  */
 542 static int check_arg_type(char *input)
 543 {
 544         uuid_t  out;
 545         char path[PATH_MAX];
 546
 547         if (!input)
 548                 return -EINVAL;
 549
 550         if (realpath(input, path)) {
 551                 if (is_block_device(path) == 1)
 552                         return BTRFS_ARG_BLKDEV;
 553
 554                 if (is_mount_point(path) == 1)
 555                         return BTRFS_ARG_MNTPOINT;
 556
 557                 return BTRFS_ARG_UNKNOWN;
 558         }
 559
 560         if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
 561                 !uuid_parse(input, out))
 562                 return BTRFS_ARG_UUID;
 563
 564         return BTRFS_ARG_UNKNOWN;
 565 }
 566
 567 static int btrfs_scan_kernel(void *search)
 568 {
 569         int ret = 0, fd;
 570         int found = 0;
 571         FILE *f;
 572         struct mntent *mnt;
 573         struct btrfs_ioctl_fs_info_args fs_info_arg;
 574         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 575         struct btrfs_ioctl_space_args *space_info_arg = NULL;
 576         char label[BTRFS_LABEL_SIZE];
 577
 578         f = setmntent("/proc/self/mounts", "r");
 579         if (f == NULL)
 580                 return 1;
 581
 582         memset(label, 0, sizeof(label));
 583         while ((mnt = getmntent(f)) != NULL) {
 584                 if (strcmp(mnt->mnt_type, "btrfs"))
 585                         continue;
 586                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 587                                 &dev_info_arg);
 588                 if (ret)
 589                         goto out;
 590
 591                 if (get_label_mounted(mnt->mnt_dir, label)) {
 592                         kfree(dev_info_arg);
 593                         goto out;
 594                 }
 595                 if (search && !match_search_item_kernel(fs_info_arg.fsid,
 596                                         mnt->mnt_dir, label, search)) {
 597                         kfree(dev_info_arg);
 598                         continue;
 599                 }
 600
 601                 fd = open(mnt->mnt_dir, O_RDONLY);
 602                 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
 603                         print_one_fs(&fs_info_arg, dev_info_arg,
 604                                         space_info_arg, label, mnt->mnt_dir);
 605                         kfree(space_info_arg);
 606                         memset(label, 0, sizeof(label));
 607                         found = 1;
 608                 }
 609                 if (fd != -1)
 610                         close(fd);
 611                 kfree(dev_info_arg);
 612         }
 613
 614 out:
 615         endmntent(f);
 616         return !found;
 617 }
 618
 619 static int dev_to_fsid(char *dev, __u8 *fsid)
 620 {
 621         struct btrfs_super_block *disk_super;
 622         char *buf;
 623         int ret;
 624         int fd;
 625
 626         buf = malloc(4096);
 627         if (!buf)
 628                 return -ENOMEM;
 629
 630         fd = open(dev, O_RDONLY);
 631         if (fd < 0) {
 632                 ret = -errno;
 633                 free(buf);
 634                 return ret;
 635         }
 636
 637         disk_super = (struct btrfs_super_block *)buf;
 638         ret = btrfs_read_dev_super(fd, disk_super,
 639                                    BTRFS_SUPER_INFO_OFFSET, 0);
 640         if (ret)
 641                 goto out;
 642
 643         memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 644         ret = 0;
 645
 646 out:
 647         close(fd);
 648         free(buf);
 649         return ret;
 650 }
 651
 652 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 653 {
 654         struct btrfs_fs_devices *cur_seed, *next_seed;
 655         struct btrfs_device *device;
 656
 657         while (!list_empty(&fs_devices->devices)) {
 658                 device = list_entry(fs_devices->devices.next,
 659                                         struct btrfs_device, dev_list);
 660                 list_del(&device->dev_list);
 661
 662                 free(device->name);
 663                 free(device->label);
 664                 free(device);
 665         }
 666
 667         /* free seed fs chain */
 668         cur_seed = fs_devices->seed;
 669         fs_devices->seed = NULL;
 670         while (cur_seed) {
 671                 next_seed = cur_seed->seed;
 672                 free(cur_seed);
 673
 674                 cur_seed = next_seed;
 675         }
 676
 677         list_del(&fs_devices->list);
 678         free(fs_devices);
 679 }
 680
 681 static int copy_device(struct btrfs_device *dst,
 682                        struct btrfs_device *src)
 683 {
 684         dst->devid = src->devid;
 685         memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
 686         if (src->name == NULL)
 687                 dst->name = NULL;
 688         else {
 689                 dst->name = strdup(src->name);
 690                 if (!dst->name)
 691                         return -ENOMEM;
 692         }
 693         if (src->label == NULL)
 694                 dst->label = NULL;
 695         else {
 696                 dst->label = strdup(src->label);
 697                 if (!dst->label) {
 698                         free(dst->name);
 699                         return -ENOMEM;
 700                 }
 701         }
 702         dst->total_devs = src->total_devs;
 703         dst->super_bytes_used = src->super_bytes_used;
 704         dst->total_bytes = src->total_bytes;
 705         dst->bytes_used = src->bytes_used;
 706         dst->generation = src->generation;
 707
 708         return 0;
 709 }
 710
 711 static int copy_fs_devices(struct btrfs_fs_devices *dst,
 712                            struct btrfs_fs_devices *src)
 713 {
 714         struct btrfs_device *cur_dev, *dev_copy;
 715         int ret = 0;
 716
 717         memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
 718         INIT_LIST_HEAD(&dst->devices);
 719         dst->seed = NULL;
 720
 721         list_for_each_entry(cur_dev, &src->devices, dev_list) {
 722                 dev_copy = malloc(sizeof(*dev_copy));
 723                 if (!dev_copy) {
 724                         ret = -ENOMEM;
 725                         break;
 726                 }
 727
 728                 ret = copy_device(dev_copy, cur_dev);
 729                 if (ret) {
 730                         free(dev_copy);
 731                         break;
 732                 }
 733
 734                 list_add(&dev_copy->dev_list, &dst->devices);
 735                 dev_copy->fs_devices = dst;
 736         }
 737
 738         return ret;
 739 }
 740
 741 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
 742                               struct btrfs_fs_devices *copy,
 743                               struct list_head *fs_uuids) {
 744         struct btrfs_fs_devices *cur_fs;
 745
 746         list_for_each_entry(cur_fs, fs_uuids, list)
 747                 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
 748                         return copy_fs_devices(copy, cur_fs);
 749
 750         return 1;
 751 }
 752
 753 static int map_seed_devices(struct list_head *all_uuids,
 754                             char *search, int *found)
 755 {
 756         struct btrfs_fs_devices *cur_fs, *cur_seed;
 757         struct btrfs_fs_devices *fs_copy, *seed_copy;
 758         struct btrfs_fs_devices *opened_fs;
 759         struct btrfs_device *device;
 760         struct btrfs_fs_info *fs_info;
 761         struct list_head *fs_uuids;
 762         int ret = 0;
 763
 764         fs_uuids = btrfs_scanned_uuids();
 765
 766         /*
 767          * The fs_uuids list is global, and open_ctree_* will
 768          * modify it, make a private copy here
 769          */
 770         list_for_each_entry(cur_fs, fs_uuids, list) {
 771                 /* don't bother handle all fs, if search target specified */
 772                 if (search) {
 773                         if (uuid_search(cur_fs, search) == 0)
 774                                 continue;
 775                         *found = 1;
 776                 }
 777
 778                 /* skip all fs already shown as mounted fs */
 779                 if (is_seen_fsid(cur_fs->fsid))
 780                         continue;
 781
 782                 fs_copy = malloc(sizeof(*fs_copy));
 783                 if (!fs_copy) {
 784                         ret = -ENOMEM;
 785                         goto out;
 786                 }
 787
 788                 ret = copy_fs_devices(fs_copy, cur_fs);
 789                 if (ret) {
 790                         free(fs_copy);
 791                         goto out;
 792                 }
 793
 794                 list_add(&fs_copy->list, all_uuids);
 795         }
 796
 797         list_for_each_entry(cur_fs, all_uuids, list) {
 798                 device = list_first_entry(&cur_fs->devices,
 799                                                 struct btrfs_device, dev_list);
 800                 if (!device)
 801                         continue;
 802                 /*
 803                  * open_ctree_* detects seed/sprout mapping
 804                  */
 805                 fs_info = open_ctree_fs_info(device->name, 0, 0,
 806                                                 OPEN_CTREE_PARTIAL);
 807                 if (!fs_info)
 808                         continue;
 809
 810                 /*
 811                  * copy the seed chain under the opened fs
 812                  */
 813                 opened_fs = fs_info->fs_devices;
 814                 cur_seed = cur_fs;
 815                 while (opened_fs->seed) {
 816                         seed_copy = malloc(sizeof(*seed_copy));
 817                         if (!seed_copy) {
 818                                 ret = -ENOMEM;
 819                                 goto fail_out;
 820                         }
 821                         ret = find_and_copy_seed(opened_fs->seed, seed_copy,
 822                                                  fs_uuids);
 823                         if (ret) {
 824                                 free(seed_copy);
 825                                 goto fail_out;
 826                         }
 827
 828                         cur_seed->seed = seed_copy;
 829
 830                         opened_fs = opened_fs->seed;
 831                         cur_seed = cur_seed->seed;
 832                 }
 833
 834                 close_ctree(fs_info->chunk_root);
 835         }
 836
 837 out:
 838         return ret;
 839 fail_out:
 840         close_ctree(fs_info->chunk_root);
 841         goto out;
 842 }
 843
 844 static const char * const cmd_show_usage[] = {
 845         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 846         "Show the structure of a filesystem",
 847         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 848         "-m|--mounted       show only mounted btrfs",
 849         "If no argument is given, structure of all present filesystems is shown.",
 850         NULL
 851 };
 852
 853 static int cmd_show(int argc, char **argv)
 854 {
 855         LIST_HEAD(all_uuids);
 856         struct btrfs_fs_devices *fs_devices;
 857         char *search = NULL;
 858         int ret;
 859         /* default, search both kernel and udev */
 860         int where = -1;
 861         int type = 0;
 862         char mp[BTRFS_PATH_NAME_MAX + 1];
 863         char path[PATH_MAX];
 864         __u8 fsid[BTRFS_FSID_SIZE];
 865         char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 866         int found = 0;
 867
 868         while (1) {
 869                 int long_index;
 870                 static struct option long_options[] = {
 871                         { "all-devices", no_argument, NULL, 'd'},
 872                         { "mounted", no_argument, NULL, 'm'},
 873                         { NULL, no_argument, NULL, 0 },
 874                 };
 875                 int c = getopt_long(argc, argv, "dm", long_options,
 876                                         &long_index);
 877                 if (c < 0)
 878                         break;
 879                 switch (c) {
 880                 case 'd':
 881                         where = BTRFS_SCAN_LBLKID;
 882                         break;
 883                 case 'm':
 884                         where = BTRFS_SCAN_MOUNTED;
 885                         break;
 886                 default:
 887                         usage(cmd_show_usage);
 888                 }
 889         }
 890
 891         if (check_argc_max(argc, optind + 1))
 892                 usage(cmd_show_usage);
 893
 894         if (argc > optind) {
 895                 search = argv[optind];
 896                 if (strlen(search) == 0)
 897                         usage(cmd_show_usage);
 898                 type = check_arg_type(search);
 899                 /*
 900                  * needs spl handling if input arg is block dev
 901                  * And if input arg is mount-point just print it
 902                  * right away
 903                  */
 904                 if (type == BTRFS_ARG_BLKDEV) {
 905                         if (where == BTRFS_SCAN_LBLKID) {
 906                                 /* we need to do this because
 907                                  * legacy BTRFS_SCAN_DEV
 908                                  * provides /dev/dm-x paths
 909                                  */
 910                                 if (realpath(search, path))
 911                                         search = path;
 912                         } else {
 913                                 ret = get_btrfs_mount(search,
 914                                                 mp, sizeof(mp));
 915                                 if (!ret) {
 916                                         /* given block dev is mounted*/
 917                                         search = mp;
 918                                         type = BTRFS_ARG_MNTPOINT;
 919                                 } else {
 920                                         ret = dev_to_fsid(search, fsid);
 921                                         if (ret) {
 922                                                 fprintf(stderr,
 923                                                         "ERROR: No btrfs on %s\n",
 924                                                         search);
 925                                                 return 1;
 926                                         }
 927                                         uuid_unparse(fsid, uuid_buf);
 928                                         search = uuid_buf;
 929                                         type = BTRFS_ARG_UUID;
 930                                         goto devs_only;
 931                                 }
 932                         }
 933                 }
 934         }
 935
 936         if (where == BTRFS_SCAN_LBLKID)
 937                 goto devs_only;
 938
 939         /* show mounted btrfs */
 940         ret = btrfs_scan_kernel(search);
 941         if (search && !ret) {
 942                 /* since search is found we are done */
 943                 goto out;
 944         }
 945
 946         /* shows mounted only */
 947         if (where == BTRFS_SCAN_MOUNTED)
 948                 goto out;
 949
 950 devs_only:
 951         ret = btrfs_scan_lblkid();
 952
 953         if (ret) {
 954                 fprintf(stderr, "ERROR: %d while scanning\n", ret);
 955                 return 1;
 956         }
 957
 958         /*
 959          * scan_for_btrfs() don't build seed/sprout mapping,
 960          * do mapping build for each scanned fs here
 961          */
 962         ret = map_seed_devices(&all_uuids, search, &found);
 963         if (ret) {
 964                 fprintf(stderr,
 965                         "ERROR: %d while mapping seed devices\n", ret);
 966                 return 1;
 967         }
 968
 969         list_for_each_entry(fs_devices, &all_uuids, list)
 970                 print_one_uuid(fs_devices);
 971
 972         if (search && !found)
 973                 ret = 1;
 974
 975         while (!list_empty(&all_uuids)) {
 976                 fs_devices = list_entry(all_uuids.next,
 977                                         struct btrfs_fs_devices, list);
 978                 free_fs_devices(fs_devices);
 979         }
 980 out:
 981         printf("%s\n", BTRFS_BUILD_VERSION);
 982         free_seen_fsid();
 983         return ret;
 984 }
 985
 986 static const char * const cmd_sync_usage[] = {
 987         "btrfs filesystem sync <path>",
 988         "Force a sync on a filesystem",
 989         NULL
 990 };
 991
 992 static int cmd_sync(int argc, char **argv)
 993 {
 994         int     fd, res, e;
 995         char    *path;
 996         DIR     *dirstream = NULL;
 997
 998         if (check_argc_exact(argc, 2))
 999                 usage(cmd_sync_usage);
1000
1001         path = argv[1];
1002
1003         fd = open_file_or_dir(path, &dirstream);
1004         if (fd < 0) {
1005                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1006                 return 1;
1007         }
1008
1009         printf("FSSync '%s'\n", path);
1010         res = ioctl(fd, BTRFS_IOC_SYNC);
1011         e = errno;
1012         close_file_or_dir(fd, dirstream);
1013         if( res < 0 ){
1014                 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
1015                         path, strerror(e));
1016                 return 1;
1017         }
1018
1019         return 0;
1020 }
1021
1022 static int parse_compress_type(char *s)
1023 {
1024         if (strcmp(optarg, "zlib") == 0)
1025                 return BTRFS_COMPRESS_ZLIB;
1026         else if (strcmp(optarg, "lzo") == 0)
1027                 return BTRFS_COMPRESS_LZO;
1028         else {
1029                 fprintf(stderr, "Unknown compress type %s\n", s);
1030                 exit(1);
1031         };
1032 }
1033
1034 static const char * const cmd_defrag_usage[] = {
1035         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
1036         "Defragment a file or a directory",
1037         "",
1038         "-v             be verbose",
1039         "-r             defragment files recursively",
1040         "-c[zlib,lzo]   compress the file while defragmenting",
1041         "-f             flush data to disk immediately after defragmenting",
1042         "-s start       defragment only from byte onward",
1043         "-l len         defragment only up to len bytes",
1044         "-t size        minimal size of file to be considered for defragmenting",
1045         NULL
1046 };
1047
1048 static int do_defrag(int fd, int fancy_ioctl,
1049                 struct btrfs_ioctl_defrag_range_args *range)
1050 {
1051         int ret;
1052
1053         if (!fancy_ioctl)
1054                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
1055         else
1056                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
1057
1058         return ret;
1059 }
1060
1061 static int defrag_global_fancy_ioctl;
1062 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
1063 static int defrag_global_verbose;
1064 static int defrag_global_errors;
1065 static int defrag_callback(const char *fpath, const struct stat *sb,
1066                 int typeflag, struct FTW *ftwbuf)
1067 {
1068         int ret = 0;
1069         int e = 0;
1070         int fd = 0;
1071
1072         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
1073                 if (defrag_global_verbose)
1074                         printf("%s\n", fpath);
1075                 fd = open(fpath, O_RDWR);
1076                 e = errno;
1077                 if (fd < 0)
1078                         goto error;
1079                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1080                 e = errno;
1081                 close(fd);
1082                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1083                         fprintf(stderr, "ERROR: defrag range ioctl not "
1084                                 "supported in this kernel, please try "
1085                                 "without any options.\n");
1086                         defrag_global_errors++;
1087                         return ENOTTY;
1088                 }
1089                 if (ret)
1090                         goto error;
1091         }
1092         return 0;
1093
1094 error:
1095         fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
1096         defrag_global_errors++;
1097         return 0;
1098 }
1099
1100 static int cmd_defrag(int argc, char **argv)
1101 {
1102         int fd;
1103         int flush = 0;
1104         u64 start = 0;
1105         u64 len = (u64)-1;
1106         u32 thresh = 0;
1107         int i;
1108         int recursive = 0;
1109         int ret = 0;
1110         struct btrfs_ioctl_defrag_range_args range;
1111         int e = 0;
1112         int compress_type = BTRFS_COMPRESS_NONE;
1113         DIR *dirstream;
1114
1115         defrag_global_errors = 0;
1116         defrag_global_verbose = 0;
1117         defrag_global_errors = 0;
1118         defrag_global_fancy_ioctl = 0;
1119         optind = 1;
1120         while(1) {
1121                 int c = getopt(argc, argv, "vrc::fs:l:t:");
1122                 if (c < 0)
1123                         break;
1124
1125                 switch(c) {
1126                 case 'c':
1127                         compress_type = BTRFS_COMPRESS_ZLIB;
1128                         if (optarg)
1129                                 compress_type = parse_compress_type(optarg);
1130                         defrag_global_fancy_ioctl = 1;
1131                         break;
1132                 case 'f':
1133                         flush = 1;
1134                         defrag_global_fancy_ioctl = 1;
1135                         break;
1136                 case 'v':
1137                         defrag_global_verbose = 1;
1138                         break;
1139                 case 's':
1140                         start = parse_size(optarg);
1141                         defrag_global_fancy_ioctl = 1;
1142                         break;
1143                 case 'l':
1144                         len = parse_size(optarg);
1145                         defrag_global_fancy_ioctl = 1;
1146                         break;
1147                 case 't':
1148                         thresh = parse_size(optarg);
1149                         defrag_global_fancy_ioctl = 1;
1150                         break;
1151                 case 'r':
1152                         recursive = 1;
1153                         break;
1154                 default:
1155                         usage(cmd_defrag_usage);
1156                 }
1157         }
1158
1159         if (check_argc_min(argc - optind, 1))
1160                 usage(cmd_defrag_usage);
1161
1162         memset(&defrag_global_range, 0, sizeof(range));
1163         defrag_global_range.start = start;
1164         defrag_global_range.len = len;
1165         defrag_global_range.extent_thresh = thresh;
1166         if (compress_type) {
1167                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1168                 defrag_global_range.compress_type = compress_type;
1169         }
1170         if (flush)
1171                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1172
1173         for (i = optind; i < argc; i++) {
1174                 struct stat st;
1175
1176                 dirstream = NULL;
1177                 fd = open_file_or_dir(argv[i], &dirstream);
1178                 if (fd < 0) {
1179                         fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
1180                                         strerror(errno));
1181                         defrag_global_errors++;
1182                         close_file_or_dir(fd, dirstream);
1183                         continue;
1184                 }
1185                 if (fstat(fd, &st)) {
1186                         fprintf(stderr, "ERROR: failed to stat %s - %s\n",
1187                                         argv[i], strerror(errno));
1188                         defrag_global_errors++;
1189                         close_file_or_dir(fd, dirstream);
1190                         continue;
1191                 }
1192                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1193                         fprintf(stderr,
1194                             "ERROR: %s is not a directory or a regular file\n",
1195                             argv[i]);
1196                         defrag_global_errors++;
1197                         close_file_or_dir(fd, dirstream);
1198                         continue;
1199                 }
1200                 if (recursive) {
1201                         if (S_ISDIR(st.st_mode)) {
1202                                 ret = nftw(argv[i], defrag_callback, 10,
1203                                                 FTW_MOUNT | FTW_PHYS);
1204                                 if (ret == ENOTTY)
1205                                         exit(1);
1206                                 /* errors are handled in the callback */
1207                                 ret = 0;
1208                         } else {
1209                                 if (defrag_global_verbose)
1210                                         printf("%s\n", argv[i]);
1211                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1212                                                 &defrag_global_range);
1213                                 e = errno;
1214                         }
1215                 } else {
1216                         if (defrag_global_verbose)
1217                                 printf("%s\n", argv[i]);
1218                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
1219                                         &defrag_global_range);
1220                         e = errno;
1221                 }
1222                 close_file_or_dir(fd, dirstream);
1223                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1224                         fprintf(stderr, "ERROR: defrag range ioctl not "
1225                                 "supported in this kernel, please try "
1226                                 "without any options.\n");
1227                         defrag_global_errors++;
1228                         break;
1229                 }
1230                 if (ret) {
1231                         fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
1232                                 argv[i], strerror(e));
1233                         defrag_global_errors++;
1234                 }
1235         }
1236         if (defrag_global_verbose)
1237                 printf("%s\n", BTRFS_BUILD_VERSION);
1238         if (defrag_global_errors)
1239                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1240
1241         return !!defrag_global_errors;
1242 }
1243
1244 static const char * const cmd_resize_usage[] = {
1245         "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1246         "Resize a filesystem",
1247         "If 'max' is passed, the filesystem will occupy all available space",
1248         "on the device 'devid'.",
1249         "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1250         NULL
1251 };
1252
1253 static int cmd_resize(int argc, char **argv)
1254 {
1255         struct btrfs_ioctl_vol_args     args;
1256         int     fd, res, len, e;
1257         char    *amount, *path;
1258         DIR     *dirstream = NULL;
1259
1260         if (check_argc_exact(argc, 3))
1261                 usage(cmd_resize_usage);
1262
1263         amount = argv[1];
1264         path = argv[2];
1265
1266         len = strlen(amount);
1267         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1268                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
1269                         amount);
1270                 return 1;
1271         }
1272
1273         fd = open_file_or_dir(path, &dirstream);
1274         if (fd < 0) {
1275                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1276                 return 1;
1277         }
1278
1279         printf("Resize '%s' of '%s'\n", path, amount);
1280         strncpy_null(args.name, amount);
1281         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1282         e = errno;
1283         close_file_or_dir(fd, dirstream);
1284         if( res < 0 ){
1285                 fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
1286                         path, strerror(e));
1287                 return 1;
1288         }
1289         return 0;
1290 }
1291
1292 static const char * const cmd_label_usage[] = {
1293         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1294         "Get or change the label of a filesystem",
1295         "With one argument, get the label of filesystem on <device>.",
1296         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1297         NULL
1298 };
1299
1300 static int cmd_label(int argc, char **argv)
1301 {
1302         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
1303                 usage(cmd_label_usage);
1304
1305         if (argc > 2) {
1306                 return set_label(argv[1], argv[2]);
1307         } else {
1308                 char label[BTRFS_LABEL_SIZE];
1309                 int ret;
1310
1311                 ret = get_label(argv[1], label);
1312                 if (!ret)
1313                         fprintf(stdout, "%s\n", label);
1314
1315                 return ret;
1316         }
1317 }
1318
1319 const struct cmd_group filesystem_cmd_group = {
1320         filesystem_cmd_group_usage, NULL, {
1321                 { "df", cmd_df, cmd_df_usage, NULL, 0 },
1322                 { "show", cmd_show, cmd_show_usage, NULL, 0 },
1323                 { "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
1324                 { "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
1325                 { "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
1326                 { "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
1327                 { "label", cmd_label, cmd_label_usage, NULL, 0 },
1328                 NULL_CMD_STRUCT
1329         }
1330 };
1331
1332 int cmd_filesystem(int argc, char **argv)
1333 {
1334         return handle_command_group(&filesystem_cmd_group, argc, argv);
1335 }