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