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