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 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <sys/ioctl.h>
  22 #include <errno.h>
  23 #include <uuid/uuid.h>
  24 #include <ctype.h>
  25 #include <fcntl.h>
  26 #include <ftw.h>
  27 #include <mntent.h>
  28 #include <linux/limits.h>
  29 #include <getopt.h>
  30
  31 #include "kerncompat.h"
  32 #include "ctree.h"
  33 #include "ioctl.h"
  34 #include "utils.h"
  35 #include "volumes.h"
  36 #include "commands.h"
  37 #include "cmds-fi-usage.h"
  38 #include "list_sort.h"
  39 #include "disk-io.h"
  40
  41
  42 /*
  43  * for btrfs fi show, we maintain a hash of fsids we've already printed.
  44  * This way we don't print dups if a given FS is mounted more than once.
  45  */
  46 #define SEEN_FSID_HASH_SIZE 256
  47
  48 struct seen_fsid {
  49         u8 fsid[BTRFS_FSID_SIZE];
  50         struct seen_fsid *next;
  51 };
  52
  53 static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
  54
  55 static int is_seen_fsid(u8 *fsid)
  56 {
  57         u8 hash = fsid[0];
  58         int slot = hash % SEEN_FSID_HASH_SIZE;
  59         struct seen_fsid *seen = seen_fsid_hash[slot];
  60
  61         return seen ? 1 : 0;
  62 }
  63
  64 static int add_seen_fsid(u8 *fsid)
  65 {
  66         u8 hash = fsid[0];
  67         int slot = hash % SEEN_FSID_HASH_SIZE;
  68         struct seen_fsid *seen = seen_fsid_hash[slot];
  69         struct seen_fsid *alloc;
  70
  71         if (!seen)
  72                 goto insert;
  73
  74         while (1) {
  75                 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
  76                         return -EEXIST;
  77
  78                 if (!seen->next)
  79                         break;
  80
  81                 seen = seen->next;
  82         }
  83
  84 insert:
  85
  86         alloc = malloc(sizeof(*alloc));
  87         if (!alloc)
  88                 return -ENOMEM;
  89
  90         alloc->next = NULL;
  91         memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
  92
  93         if (seen)
  94                 seen->next = alloc;
  95         else
  96                 seen_fsid_hash[slot] = alloc;
  97
  98         return 0;
  99 }
 100
 101 static void free_seen_fsid(void)
 102 {
 103         int slot;
 104         struct seen_fsid *seen;
 105         struct seen_fsid *next;
 106
 107         for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
 108                 seen = seen_fsid_hash[slot];
 109                 while (seen) {
 110                         next = seen->next;
 111                         free(seen);
 112                         seen = next;
 113                 }
 114                 seen_fsid_hash[slot] = NULL;
 115         }
 116 }
 117
 118 static const char * const filesystem_cmd_group_usage[] = {
 119         "btrfs filesystem [<group>] <command> [<args>]",
 120         NULL
 121 };
 122
 123 static const char * const cmd_filesystem_df_usage[] = {
 124         "btrfs filesystem df [options] <path>",
 125         "Show space usage information for a mount point",
 126         HELPINFO_UNITS_SHORT_LONG,
 127         NULL
 128 };
 129
 130 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 131 {
 132         u64 count = 0;
 133         int ret, e;
 134         struct btrfs_ioctl_space_args *sargs;
 135
 136         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 137         if (!sargs)
 138                 return -ENOMEM;
 139
 140         sargs->space_slots = 0;
 141         sargs->total_spaces = 0;
 142
 143         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 144         e = errno;
 145         if (ret) {
 146                 error("cannot get space info: %s\n", strerror(e));
 147                 free(sargs);
 148                 return -e;
 149         }
 150         /* This really should never happen */
 151         if (!sargs->total_spaces) {
 152                 free(sargs);
 153                 return -ENOENT;
 154         }
 155         count = sargs->total_spaces;
 156         free(sargs);
 157
 158         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 159                         (count * sizeof(struct btrfs_ioctl_space_info)));
 160         if (!sargs)
 161                 return -ENOMEM;
 162
 163         sargs->space_slots = count;
 164         sargs->total_spaces = 0;
 165         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 166         e = errno;
 167         if (ret) {
 168                 error("cannot get space info with %llu slots: %s",
 169                                 count, strerror(e));
 170                 free(sargs);
 171                 return -e;
 172         }
 173         *sargs_ret = sargs;
 174         return 0;
 175 }
 176
 177 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
 178 {
 179         u64 i;
 180         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 181
 182         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 183                 printf("%s, %s: total=%s, used=%s\n",
 184                         btrfs_group_type_str(sp->flags),
 185                         btrfs_group_profile_str(sp->flags),
 186                         pretty_size_mode(sp->total_bytes, unit_mode),
 187                         pretty_size_mode(sp->used_bytes, unit_mode));
 188         }
 189 }
 190
 191 static int cmd_filesystem_df(int argc, char **argv)
 192 {
 193         struct btrfs_ioctl_space_args *sargs = NULL;
 194         int ret;
 195         int fd;
 196         char *path;
 197         DIR *dirstream = NULL;
 198         unsigned unit_mode;
 199
 200         unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
 201
 202         if (argc != 2 || argv[1][0] == '-')
 203                 usage(cmd_filesystem_df_usage);
 204
 205         path = argv[1];
 206
 207         fd = btrfs_open_dir(path, &dirstream, 1);
 208         if (fd < 0)
 209                 return 1;
 210
 211         ret = get_df(fd, &sargs);
 212
 213         if (ret == 0) {
 214                 print_df(sargs, unit_mode);
 215                 free(sargs);
 216         } else {
 217                 error("get_df failed %s", strerror(-ret));
 218         }
 219
 220         close_file_or_dir(fd, dirstream);
 221         return !!ret;
 222 }
 223
 224 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
 225                                         char *search)
 226 {
 227         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 228         int search_len = strlen(search);
 229
 230         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 231         uuid_unparse(fsid, uuidbuf);
 232         if (!strncmp(uuidbuf, search, search_len))
 233                 return 1;
 234
 235         if (*label && strcmp(label, search) == 0)
 236                 return 1;
 237
 238         if (strcmp(mnt, search) == 0)
 239                 return 1;
 240
 241         return 0;
 242 }
 243
 244 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 245 {
 246         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 247         struct list_head *cur;
 248         struct btrfs_device *device;
 249         int search_len = strlen(search);
 250
 251         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 252         uuid_unparse(fs_devices->fsid, uuidbuf);
 253         if (!strncmp(uuidbuf, search, search_len))
 254                 return 1;
 255
 256         list_for_each(cur, &fs_devices->devices) {
 257                 device = list_entry(cur, struct btrfs_device, dev_list);
 258                 if ((device->label && strcmp(device->label, search) == 0) ||
 259                     strcmp(device->name, search) == 0)
 260                         return 1;
 261         }
 262         return 0;
 263 }
 264
 265 /*
 266  * Sort devices by devid, ascending
 267  */
 268 static int cmp_device_id(void *priv, struct list_head *a,
 269                 struct list_head *b)
 270 {
 271         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 272                         dev_list);
 273         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 274                         dev_list);
 275
 276         return da->devid < db->devid ? -1 :
 277                 da->devid > db->devid ? 1 : 0;
 278 }
 279
 280 static void splice_device_list(struct list_head *seed_devices,
 281                                struct list_head *all_devices)
 282 {
 283         struct btrfs_device *in_all, *next_all;
 284         struct btrfs_device *in_seed, *next_seed;
 285
 286         list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
 287                 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
 288                                                                 dev_list) {
 289                         if (in_all->devid == in_seed->devid) {
 290                                 /*
 291                                  * When do dev replace in a sprout fs
 292                                  * to a dev in its seed fs, the replacing
 293                                  * dev will reside in the sprout fs and
 294                                  * the replaced dev will still exist
 295                                  * in the seed fs.
 296                                  * So pick the latest one when showing
 297                                  * the sprout fs.
 298                                  */
 299                                 if (in_all->generation
 300                                                 < in_seed->generation) {
 301                                         list_del(&in_all->dev_list);
 302                                         free(in_all);
 303                                 } else if (in_all->generation
 304                                                 > in_seed->generation) {
 305                                         list_del(&in_seed->dev_list);
 306                                         free(in_seed);
 307                                 }
 308                                 break;
 309                         }
 310                 }
 311         }
 312
 313         list_splice(seed_devices, all_devices);
 314 }
 315
 316 static void print_devices(struct btrfs_fs_devices *fs_devices,
 317                           u64 *devs_found, unsigned unit_mode)
 318 {
 319         struct btrfs_device *device;
 320         struct btrfs_fs_devices *cur_fs;
 321         struct list_head *all_devices;
 322
 323         all_devices = &fs_devices->devices;
 324         cur_fs = fs_devices->seed;
 325         /* add all devices of seed fs to the fs to be printed */
 326         while (cur_fs) {
 327                 splice_device_list(&cur_fs->devices, all_devices);
 328                 cur_fs = cur_fs->seed;
 329         }
 330
 331         list_sort(NULL, all_devices, cmp_device_id);
 332         list_for_each_entry(device, all_devices, dev_list) {
 333                 printf("\tdevid %4llu size %s used %s path %s\n",
 334                        (unsigned long long)device->devid,
 335                        pretty_size_mode(device->total_bytes, unit_mode),
 336                        pretty_size_mode(device->bytes_used, unit_mode),
 337                        device->name);
 338
 339                 (*devs_found)++;
 340         }
 341 }
 342
 343 static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
 344                            unsigned unit_mode)
 345 {
 346         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 347         struct btrfs_device *device;
 348         u64 devs_found = 0;
 349         u64 total;
 350
 351         if (add_seen_fsid(fs_devices->fsid))
 352                 return;
 353
 354         uuid_unparse(fs_devices->fsid, uuidbuf);
 355         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 356                             dev_list);
 357         if (device->label && device->label[0])
 358                 printf("Label: '%s' ", device->label);
 359         else
 360                 printf("Label: none ");
 361
 362         total = device->total_devs;
 363         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 364                (unsigned long long)total,
 365                pretty_size_mode(device->super_bytes_used, unit_mode));
 366
 367         print_devices(fs_devices, &devs_found, unit_mode);
 368
 369         if (devs_found < total) {
 370                 printf("\t*** Some devices missing\n");
 371         }
 372         printf("\n");
 373 }
 374
 375 /* adds up all the used spaces as reported by the space info ioctl
 376  */
 377 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 378 {
 379         u64 ret = 0;
 380         int i;
 381         for (i = 0; i < si->total_spaces; i++)
 382                 ret += si->spaces[i].used_bytes;
 383         return ret;
 384 }
 385
 386 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 387                 struct btrfs_ioctl_dev_info_args *dev_info,
 388                 struct btrfs_ioctl_space_args *space_info,
 389                 char *label, unsigned unit_mode)
 390 {
 391         int i;
 392         int fd;
 393         int missing = 0;
 394         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 395         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 396         int ret;
 397
 398         ret = add_seen_fsid(fs_info->fsid);
 399         if (ret == -EEXIST)
 400                 return 0;
 401         else if (ret)
 402                 return ret;
 403
 404         uuid_unparse(fs_info->fsid, uuidbuf);
 405         if (label && *label)
 406                 printf("Label: '%s' ", label);
 407         else
 408                 printf("Label: none ");
 409
 410         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 411                         fs_info->num_devices,
 412                         pretty_size_mode(calc_used_bytes(space_info),
 413                                          unit_mode));
 414
 415         for (i = 0; i < fs_info->num_devices; i++) {
 416                 char *canonical_path;
 417
 418                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 419
 420                 /* Add check for missing devices even mounted */
 421                 fd = open((char *)tmp_dev_info->path, O_RDONLY);
 422                 if (fd < 0) {
 423                         missing = 1;
 424                         continue;
 425                 }
 426                 close(fd);
 427                 canonical_path = canonicalize_path((char *)tmp_dev_info->path);
 428                 printf("\tdevid %4llu size %s used %s path %s\n",
 429                         tmp_dev_info->devid,
 430                         pretty_size_mode(tmp_dev_info->total_bytes, unit_mode),
 431                         pretty_size_mode(tmp_dev_info->bytes_used, unit_mode),
 432                         canonical_path);
 433
 434                 free(canonical_path);
 435         }
 436
 437         if (missing)
 438                 printf("\t*** Some devices missing\n");
 439         printf("\n");
 440         return 0;
 441 }
 442
 443 static int btrfs_scan_kernel(void *search, unsigned unit_mode)
 444 {
 445         int ret = 0, fd;
 446         int found = 0;
 447         FILE *f;
 448         struct mntent *mnt;
 449         struct btrfs_ioctl_fs_info_args fs_info_arg;
 450         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 451         struct btrfs_ioctl_space_args *space_info_arg = NULL;
 452         char label[BTRFS_LABEL_SIZE];
 453
 454         f = setmntent("/proc/self/mounts", "r");
 455         if (f == NULL)
 456                 return 1;
 457
 458         memset(label, 0, sizeof(label));
 459         while ((mnt = getmntent(f)) != NULL) {
 460                 if (strcmp(mnt->mnt_type, "btrfs"))
 461                         continue;
 462                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 463                                 &dev_info_arg);
 464                 if (ret) {
 465                         kfree(dev_info_arg);
 466                         goto out;
 467                 }
 468
 469                 /* skip all fs already shown as mounted fs */
 470                 if (is_seen_fsid(fs_info_arg.fsid))
 471                         continue;
 472
 473                 ret = get_label_mounted(mnt->mnt_dir, label);
 474                 /* provide backward kernel compatibility */
 475                 if (ret == -ENOTTY)
 476                         ret = get_label_unmounted(
 477                                 (const char *)dev_info_arg->path, label);
 478
 479                 if (ret) {
 480                         kfree(dev_info_arg);
 481                         goto out;
 482                 }
 483                 if (search && !match_search_item_kernel(fs_info_arg.fsid,
 484                                         mnt->mnt_dir, label, search)) {
 485                         kfree(dev_info_arg);
 486                         dev_info_arg = NULL;
 487                         continue;
 488                 }
 489
 490                 fd = open(mnt->mnt_dir, O_RDONLY);
 491                 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
 492                         print_one_fs(&fs_info_arg, dev_info_arg,
 493                                      space_info_arg, label, unit_mode);
 494                         kfree(space_info_arg);
 495                         memset(label, 0, sizeof(label));
 496                         found = 1;
 497                 }
 498                 if (fd != -1)
 499                         close(fd);
 500                 kfree(dev_info_arg);
 501                 dev_info_arg = NULL;
 502         }
 503
 504 out:
 505         endmntent(f);
 506         return !found;
 507 }
 508
 509 static int dev_to_fsid(char *dev, __u8 *fsid)
 510 {
 511         struct btrfs_super_block *disk_super;
 512         char buf[BTRFS_SUPER_INFO_SIZE];
 513         int ret;
 514         int fd;
 515
 516         fd = open(dev, O_RDONLY);
 517         if (fd < 0) {
 518                 ret = -errno;
 519                 return ret;
 520         }
 521
 522         disk_super = (struct btrfs_super_block *)buf;
 523         ret = btrfs_read_dev_super(fd, disk_super,
 524                                    BTRFS_SUPER_INFO_OFFSET, 0);
 525         if (ret)
 526                 goto out;
 527
 528         memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 529         ret = 0;
 530
 531 out:
 532         close(fd);
 533         return ret;
 534 }
 535
 536 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 537 {
 538         struct btrfs_fs_devices *cur_seed, *next_seed;
 539         struct btrfs_device *device;
 540
 541         while (!list_empty(&fs_devices->devices)) {
 542                 device = list_entry(fs_devices->devices.next,
 543                                         struct btrfs_device, dev_list);
 544                 list_del(&device->dev_list);
 545
 546                 free(device->name);
 547                 free(device->label);
 548                 free(device);
 549         }
 550
 551         /* free seed fs chain */
 552         cur_seed = fs_devices->seed;
 553         fs_devices->seed = NULL;
 554         while (cur_seed) {
 555                 next_seed = cur_seed->seed;
 556                 free(cur_seed);
 557
 558                 cur_seed = next_seed;
 559         }
 560
 561         list_del(&fs_devices->list);
 562         free(fs_devices);
 563 }
 564
 565 static int copy_device(struct btrfs_device *dst,
 566                        struct btrfs_device *src)
 567 {
 568         dst->devid = src->devid;
 569         memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
 570         if (src->name == NULL)
 571                 dst->name = NULL;
 572         else {
 573                 dst->name = strdup(src->name);
 574                 if (!dst->name)
 575                         return -ENOMEM;
 576         }
 577         if (src->label == NULL)
 578                 dst->label = NULL;
 579         else {
 580                 dst->label = strdup(src->label);
 581                 if (!dst->label) {
 582                         free(dst->name);
 583                         return -ENOMEM;
 584                 }
 585         }
 586         dst->total_devs = src->total_devs;
 587         dst->super_bytes_used = src->super_bytes_used;
 588         dst->total_bytes = src->total_bytes;
 589         dst->bytes_used = src->bytes_used;
 590         dst->generation = src->generation;
 591
 592         return 0;
 593 }
 594
 595 static int copy_fs_devices(struct btrfs_fs_devices *dst,
 596                            struct btrfs_fs_devices *src)
 597 {
 598         struct btrfs_device *cur_dev, *dev_copy;
 599         int ret = 0;
 600
 601         memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
 602         INIT_LIST_HEAD(&dst->devices);
 603         dst->seed = NULL;
 604
 605         list_for_each_entry(cur_dev, &src->devices, dev_list) {
 606                 dev_copy = malloc(sizeof(*dev_copy));
 607                 if (!dev_copy) {
 608                         ret = -ENOMEM;
 609                         break;
 610                 }
 611
 612                 ret = copy_device(dev_copy, cur_dev);
 613                 if (ret) {
 614                         free(dev_copy);
 615                         break;
 616                 }
 617
 618                 list_add(&dev_copy->dev_list, &dst->devices);
 619                 dev_copy->fs_devices = dst;
 620         }
 621
 622         return ret;
 623 }
 624
 625 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
 626                               struct btrfs_fs_devices *copy,
 627                               struct list_head *fs_uuids) {
 628         struct btrfs_fs_devices *cur_fs;
 629
 630         list_for_each_entry(cur_fs, fs_uuids, list)
 631                 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
 632                         return copy_fs_devices(copy, cur_fs);
 633
 634         return 1;
 635 }
 636
 637 static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
 638 {
 639         struct btrfs_device *device;
 640         int dev_cnt_total, dev_cnt = 0;
 641
 642         device = list_first_entry(&fs_devices->devices, struct btrfs_device,
 643                                   dev_list);
 644
 645         dev_cnt_total = device->total_devs;
 646
 647         list_for_each_entry(device, &fs_devices->devices, dev_list)
 648                 dev_cnt++;
 649
 650         return dev_cnt_total != dev_cnt;
 651 }
 652
 653 static int search_umounted_fs_uuids(struct list_head *all_uuids,
 654                                     char *search, int *found)
 655 {
 656         struct btrfs_fs_devices *cur_fs, *fs_copy;
 657         struct list_head *fs_uuids;
 658         int ret = 0;
 659
 660         fs_uuids = btrfs_scanned_uuids();
 661
 662         /*
 663          * The fs_uuids list is global, and open_ctree_* will
 664          * modify it, make a private copy here
 665          */
 666         list_for_each_entry(cur_fs, fs_uuids, list) {
 667                 /* don't bother handle all fs, if search target specified */
 668                 if (search) {
 669                         if (uuid_search(cur_fs, search) == 0)
 670                                 continue;
 671                         if (found)
 672                                 *found = 1;
 673                 }
 674
 675                 /* skip all fs already shown as mounted fs */
 676                 if (is_seen_fsid(cur_fs->fsid))
 677                         continue;
 678
 679                 fs_copy = calloc(1, sizeof(*fs_copy));
 680                 if (!fs_copy) {
 681                         ret = -ENOMEM;
 682                         goto out;
 683                 }
 684
 685                 ret = copy_fs_devices(fs_copy, cur_fs);
 686                 if (ret) {
 687                         free(fs_copy);
 688                         goto out;
 689                 }
 690
 691                 list_add(&fs_copy->list, all_uuids);
 692         }
 693
 694 out:
 695         return ret;
 696 }
 697
 698 static int map_seed_devices(struct list_head *all_uuids)
 699 {
 700         struct btrfs_fs_devices *cur_fs, *cur_seed;
 701         struct btrfs_fs_devices *seed_copy;
 702         struct btrfs_fs_devices *opened_fs;
 703         struct btrfs_device *device;
 704         struct btrfs_fs_info *fs_info;
 705         struct list_head *fs_uuids;
 706         int ret = 0;
 707
 708         fs_uuids = btrfs_scanned_uuids();
 709
 710         list_for_each_entry(cur_fs, all_uuids, list) {
 711                 device = list_first_entry(&cur_fs->devices,
 712                                                 struct btrfs_device, dev_list);
 713                 if (!device)
 714                         continue;
 715
 716                 /* skip fs without seeds */
 717                 if (!has_seed_devices(cur_fs))
 718                         continue;
 719
 720                 /*
 721                  * open_ctree_* detects seed/sprout mapping
 722                  */
 723                 fs_info = open_ctree_fs_info(device->name, 0, 0,
 724                                                 OPEN_CTREE_PARTIAL);
 725                 if (!fs_info)
 726                         continue;
 727
 728                 /*
 729                  * copy the seed chain under the opened fs
 730                  */
 731                 opened_fs = fs_info->fs_devices;
 732                 cur_seed = cur_fs;
 733                 while (opened_fs->seed) {
 734                         seed_copy = malloc(sizeof(*seed_copy));
 735                         if (!seed_copy) {
 736                                 ret = -ENOMEM;
 737                                 goto fail_out;
 738                         }
 739                         ret = find_and_copy_seed(opened_fs->seed, seed_copy,
 740                                                  fs_uuids);
 741                         if (ret) {
 742                                 free(seed_copy);
 743                                 goto fail_out;
 744                         }
 745
 746                         cur_seed->seed = seed_copy;
 747
 748                         opened_fs = opened_fs->seed;
 749                         cur_seed = cur_seed->seed;
 750                 }
 751
 752                 close_ctree(fs_info->chunk_root);
 753         }
 754
 755 out:
 756         return ret;
 757 fail_out:
 758         close_ctree(fs_info->chunk_root);
 759         goto out;
 760 }
 761
 762 static const char * const cmd_filesystem_show_usage[] = {
 763         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 764         "Show the structure of a filesystem",
 765         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 766         "-m|--mounted       show only mounted btrfs",
 767         HELPINFO_UNITS_LONG,
 768         "If no argument is given, structure of all present filesystems is shown.",
 769         NULL
 770 };
 771
 772 static int cmd_filesystem_show(int argc, char **argv)
 773 {
 774         LIST_HEAD(all_uuids);
 775         struct btrfs_fs_devices *fs_devices;
 776         char *search = NULL;
 777         int ret;
 778         /* default, search both kernel and udev */
 779         int where = -1;
 780         int type = 0;
 781         char mp[PATH_MAX];
 782         char path[PATH_MAX];
 783         __u8 fsid[BTRFS_FSID_SIZE];
 784         char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 785         unsigned unit_mode;
 786         int found = 0;
 787
 788         unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
 789
 790         while (1) {
 791                 int c;
 792                 static const struct option long_options[] = {
 793                         { "all-devices", no_argument, NULL, 'd'},
 794                         { "mounted", no_argument, NULL, 'm'},
 795                         { NULL, 0, NULL, 0 }
 796                 };
 797
 798                 c = getopt_long(argc, argv, "dm", long_options, NULL);
 799                 if (c < 0)
 800                         break;
 801                 switch (c) {
 802                 case 'd':
 803                         where = BTRFS_SCAN_LBLKID;
 804                         break;
 805                 case 'm':
 806                         where = BTRFS_SCAN_MOUNTED;
 807                         break;
 808                 default:
 809                         usage(cmd_filesystem_show_usage);
 810                 }
 811         }
 812
 813         if (check_argc_max(argc, optind + 1))
 814                 usage(cmd_filesystem_show_usage);
 815
 816         if (argc > optind) {
 817                 search = argv[optind];
 818                 if (*search == 0)
 819                         usage(cmd_filesystem_show_usage);
 820                 type = check_arg_type(search);
 821
 822                 /*
 823                  * For search is a device:
 824                  *     realpath do /dev/mapper/XX => /dev/dm-X
 825                  *     which is required by BTRFS_SCAN_DEV
 826                  * For search is a mountpoint:
 827                  *     realpath do  /mnt/btrfs/  => /mnt/btrfs
 828                  *     which shall be recognized by btrfs_scan_kernel()
 829                  */
 830                 if (realpath(search, path))
 831                         search = path;
 832
 833                 /*
 834                  * Needs special handling if input arg is block dev And if
 835                  * input arg is mount-point just print it right away
 836                  */
 837                 if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
 838                         ret = get_btrfs_mount(search, mp, sizeof(mp));
 839                         if (!ret) {
 840                                 /* given block dev is mounted */
 841                                 search = mp;
 842                                 type = BTRFS_ARG_MNTPOINT;
 843                         } else {
 844                                 ret = dev_to_fsid(search, fsid);
 845                                 if (ret) {
 846                                         error("no btrfs on %s", search);
 847                                         return 1;
 848                                 }
 849                                 uuid_unparse(fsid, uuid_buf);
 850                                 search = uuid_buf;
 851                                 type = BTRFS_ARG_UUID;
 852                                 goto devs_only;
 853                         }
 854                 }
 855         }
 856
 857         if (where == BTRFS_SCAN_LBLKID)
 858                 goto devs_only;
 859
 860         /* show mounted btrfs */
 861         ret = btrfs_scan_kernel(search, unit_mode);
 862         if (search && !ret) {
 863                 /* since search is found we are done */
 864                 goto out;
 865         }
 866
 867         /* shows mounted only */
 868         if (where == BTRFS_SCAN_MOUNTED)
 869                 goto out;
 870
 871 devs_only:
 872         ret = btrfs_scan_lblkid();
 873
 874         if (ret) {
 875                 error("blkid device scan returned %d\n", ret);
 876                 return 1;
 877         }
 878
 879         ret = search_umounted_fs_uuids(&all_uuids, search, &found);
 880         if (ret < 0) {
 881                 error("searching target device returned error %d", ret);
 882                 return 1;
 883         }
 884
 885         /*
 886          * The seed/sprout mapping are not detected yet,
 887          * do mapping build for all umounted fs
 888          */
 889         ret = map_seed_devices(&all_uuids);
 890         if (ret) {
 891                 error("mapping seed devices returned error %d", ret);
 892                 return 1;
 893         }
 894
 895         list_for_each_entry(fs_devices, &all_uuids, list)
 896                 print_one_uuid(fs_devices, unit_mode);
 897
 898         if (search && !found)
 899                 ret = 1;
 900
 901         while (!list_empty(&all_uuids)) {
 902                 fs_devices = list_entry(all_uuids.next,
 903                                         struct btrfs_fs_devices, list);
 904                 free_fs_devices(fs_devices);
 905         }
 906 out:
 907         free_seen_fsid();
 908         return ret;
 909 }
 910
 911 static const char * const cmd_filesystem_sync_usage[] = {
 912         "btrfs filesystem sync <path>",
 913         "Force a sync on a filesystem",
 914         NULL
 915 };
 916
 917 static int cmd_filesystem_sync(int argc, char **argv)
 918 {
 919         int     fd, res, e;
 920         char    *path;
 921         DIR     *dirstream = NULL;
 922
 923         if (check_argc_exact(argc, 2))
 924                 usage(cmd_filesystem_sync_usage);
 925
 926         path = argv[1];
 927
 928         fd = btrfs_open_dir(path, &dirstream, 1);
 929         if (fd < 0)
 930                 return 1;
 931
 932         printf("FSSync '%s'\n", path);
 933         res = ioctl(fd, BTRFS_IOC_SYNC);
 934         e = errno;
 935         close_file_or_dir(fd, dirstream);
 936         if( res < 0 ){
 937                 error("sync ioctl failed on '%s': %s", path, strerror(e));
 938                 return 1;
 939         }
 940
 941         return 0;
 942 }
 943
 944 static int parse_compress_type(char *s)
 945 {
 946         if (strcmp(optarg, "zlib") == 0)
 947                 return BTRFS_COMPRESS_ZLIB;
 948         else if (strcmp(optarg, "lzo") == 0)
 949                 return BTRFS_COMPRESS_LZO;
 950         else {
 951                 error("unknown compression type %s", s);
 952                 exit(1);
 953         };
 954 }
 955
 956 static const char * const cmd_filesystem_defrag_usage[] = {
 957         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
 958         "Defragment a file or a directory",
 959         "",
 960         "-v             be verbose",
 961         "-r             defragment files recursively",
 962         "-c[zlib,lzo]   compress the file while defragmenting",
 963         "-f             flush data to disk immediately after defragmenting",
 964         "-s start       defragment only from byte onward",
 965         "-l len         defragment only up to len bytes",
 966         "-t size        target extent size hint",
 967         NULL
 968 };
 969
 970 static int do_defrag(int fd, int fancy_ioctl,
 971                 struct btrfs_ioctl_defrag_range_args *range)
 972 {
 973         int ret;
 974
 975         if (!fancy_ioctl)
 976                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
 977         else
 978                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
 979
 980         return ret;
 981 }
 982
 983 static int defrag_global_fancy_ioctl;
 984 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
 985 static int defrag_global_verbose;
 986 static int defrag_global_errors;
 987 static int defrag_callback(const char *fpath, const struct stat *sb,
 988                 int typeflag, struct FTW *ftwbuf)
 989 {
 990         int ret = 0;
 991         int e = 0;
 992         int fd = 0;
 993
 994         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
 995                 if (defrag_global_verbose)
 996                         printf("%s\n", fpath);
 997                 fd = open(fpath, O_RDWR);
 998                 e = errno;
 999                 if (fd < 0)
1000                         goto error;
1001                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1002                 e = errno;
1003                 close(fd);
1004                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1005                         error("defrag range ioctl not "
1006                                 "supported in this kernel, please try "
1007                                 "without any options.");
1008                         defrag_global_errors++;
1009                         return ENOTTY;
1010                 }
1011                 if (ret)
1012                         goto error;
1013         }
1014         return 0;
1015
1016 error:
1017         error("defrag failed on %s: %s", fpath, strerror(e));
1018         defrag_global_errors++;
1019         return 0;
1020 }
1021
1022 static int cmd_filesystem_defrag(int argc, char **argv)
1023 {
1024         int fd;
1025         int flush = 0;
1026         u64 start = 0;
1027         u64 len = (u64)-1;
1028         u64 thresh = 0;
1029         int i;
1030         int recursive = 0;
1031         int ret = 0;
1032         int e = 0;
1033         int compress_type = BTRFS_COMPRESS_NONE;
1034         DIR *dirstream;
1035
1036         defrag_global_errors = 0;
1037         defrag_global_verbose = 0;
1038         defrag_global_errors = 0;
1039         defrag_global_fancy_ioctl = 0;
1040         optind = 1;
1041         while(1) {
1042                 int c = getopt(argc, argv, "vrc::fs:l:t:");
1043                 if (c < 0)
1044                         break;
1045
1046                 switch(c) {
1047                 case 'c':
1048                         compress_type = BTRFS_COMPRESS_ZLIB;
1049                         if (optarg)
1050                                 compress_type = parse_compress_type(optarg);
1051                         defrag_global_fancy_ioctl = 1;
1052                         break;
1053                 case 'f':
1054                         flush = 1;
1055                         defrag_global_fancy_ioctl = 1;
1056                         break;
1057                 case 'v':
1058                         defrag_global_verbose = 1;
1059                         break;
1060                 case 's':
1061                         start = parse_size(optarg);
1062                         defrag_global_fancy_ioctl = 1;
1063                         break;
1064                 case 'l':
1065                         len = parse_size(optarg);
1066                         defrag_global_fancy_ioctl = 1;
1067                         break;
1068                 case 't':
1069                         thresh = parse_size(optarg);
1070                         if (thresh > (u32)-1) {
1071                                 warning(
1072                             "target extent size %llu too big, trimmed to %u",
1073                                         thresh, (u32)-1);
1074                                 thresh = (u32)-1;
1075                         }
1076                         defrag_global_fancy_ioctl = 1;
1077                         break;
1078                 case 'r':
1079                         recursive = 1;
1080                         break;
1081                 default:
1082                         usage(cmd_filesystem_defrag_usage);
1083                 }
1084         }
1085
1086         if (check_argc_min(argc - optind, 1))
1087                 usage(cmd_filesystem_defrag_usage);
1088
1089         memset(&defrag_global_range, 0, sizeof(defrag_global_range));
1090         defrag_global_range.start = start;
1091         defrag_global_range.len = len;
1092         defrag_global_range.extent_thresh = (u32)thresh;
1093         if (compress_type) {
1094                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1095                 defrag_global_range.compress_type = compress_type;
1096         }
1097         if (flush)
1098                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1099
1100         for (i = optind; i < argc; i++) {
1101                 struct stat st;
1102
1103                 dirstream = NULL;
1104                 fd = open_file_or_dir(argv[i], &dirstream);
1105                 if (fd < 0) {
1106                         error("cannot open %s: %s\n", argv[i],
1107                                         strerror(errno));
1108                         defrag_global_errors++;
1109                         close_file_or_dir(fd, dirstream);
1110                         continue;
1111                 }
1112                 if (fstat(fd, &st)) {
1113                         error("failed to stat %s: %s",
1114                                         argv[i], strerror(errno));
1115                         defrag_global_errors++;
1116                         close_file_or_dir(fd, dirstream);
1117                         continue;
1118                 }
1119                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1120                         error("%s is not a directory or a regular file\n",
1121                                         argv[i]);
1122                         defrag_global_errors++;
1123                         close_file_or_dir(fd, dirstream);
1124                         continue;
1125                 }
1126                 if (recursive) {
1127                         if (S_ISDIR(st.st_mode)) {
1128                                 ret = nftw(argv[i], defrag_callback, 10,
1129                                                 FTW_MOUNT | FTW_PHYS);
1130                                 if (ret == ENOTTY)
1131                                         exit(1);
1132                                 /* errors are handled in the callback */
1133                                 ret = 0;
1134                         } else {
1135                                 if (defrag_global_verbose)
1136                                         printf("%s\n", argv[i]);
1137                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1138                                                 &defrag_global_range);
1139                                 e = errno;
1140                         }
1141                 } else {
1142                         if (defrag_global_verbose)
1143                                 printf("%s\n", argv[i]);
1144                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
1145                                         &defrag_global_range);
1146                         e = errno;
1147                 }
1148                 close_file_or_dir(fd, dirstream);
1149                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1150                         error("defrag range ioctl not "
1151                                 "supported in this kernel, please try "
1152                                 "without any options.");
1153                         defrag_global_errors++;
1154                         break;
1155                 }
1156                 if (ret) {
1157                         error("defrag failed on %s: %s", argv[i], strerror(e));
1158                         defrag_global_errors++;
1159                 }
1160         }
1161         if (defrag_global_errors)
1162                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1163
1164         return !!defrag_global_errors;
1165 }
1166
1167 static const char * const cmd_filesystem_resize_usage[] = {
1168         "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1169         "Resize a filesystem",
1170         "If 'max' is passed, the filesystem will occupy all available space",
1171         "on the device 'devid'.",
1172         "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1173         NULL
1174 };
1175
1176 static int cmd_filesystem_resize(int argc, char **argv)
1177 {
1178         struct btrfs_ioctl_vol_args     args;
1179         int     fd, res, len, e;
1180         char    *amount, *path;
1181         DIR     *dirstream = NULL;
1182         struct stat st;
1183
1184         if (check_argc_exact(argc, 3))
1185                 usage(cmd_filesystem_resize_usage);
1186
1187         amount = argv[1];
1188         path = argv[2];
1189
1190         len = strlen(amount);
1191         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1192                 error("resize value too long (%s)", amount);
1193                 return 1;
1194         }
1195
1196         res = stat(path, &st);
1197         if (res < 0) {
1198                 error("resize: cannot stat %s: %s", path, strerror(errno));
1199                 return 1;
1200         }
1201         if (!S_ISDIR(st.st_mode)) {
1202                 error("resize works on mounted filesystems and accepts only\n"
1203                         "directories as argument. Passing file containing a btrfs image\n"
1204                         "would resize the underlying filesystem instead of the image.\n");
1205                 return 1;
1206         }
1207
1208         fd = btrfs_open_dir(path, &dirstream, 1);
1209         if (fd < 0)
1210                 return 1;
1211
1212         printf("Resize '%s' of '%s'\n", path, amount);
1213         memset(&args, 0, sizeof(args));
1214         strncpy_null(args.name, amount);
1215         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1216         e = errno;
1217         close_file_or_dir(fd, dirstream);
1218         if( res < 0 ){
1219                 switch (e) {
1220                 case EFBIG:
1221                         error("unable to resize '%s': no enough free space",
1222                                 path);
1223                         break;
1224                 default:
1225                         error("unable to resize '%s': %s", path, strerror(e));
1226                         break;
1227                 }
1228                 return 1;
1229         } else if (res > 0) {
1230                 const char *err_str = btrfs_err_str(res);
1231
1232                 if (err_str) {
1233                         error("resizing of '%s' failed: %s", path, err_str);
1234                 } else {
1235                         error("resizing of '%s' failed: unknown error %d",
1236                                 path, res);
1237                 }
1238                 return 1;
1239         }
1240         return 0;
1241 }
1242
1243 static const char * const cmd_filesystem_label_usage[] = {
1244         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1245         "Get or change the label of a filesystem",
1246         "With one argument, get the label of filesystem on <device>.",
1247         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1248         NULL
1249 };
1250
1251 static int cmd_filesystem_label(int argc, char **argv)
1252 {
1253         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
1254                 usage(cmd_filesystem_label_usage);
1255
1256         if (argc > 2) {
1257                 return set_label(argv[1], argv[2]);
1258         } else {
1259                 char label[BTRFS_LABEL_SIZE];
1260                 int ret;
1261
1262                 ret = get_label(argv[1], label);
1263                 if (!ret)
1264                         fprintf(stdout, "%s\n", label);
1265
1266                 return ret;
1267         }
1268 }
1269
1270 static const char filesystem_cmd_group_info[] =
1271 "overall filesystem tasks and information";
1272
1273 const struct cmd_group filesystem_cmd_group = {
1274         filesystem_cmd_group_usage, filesystem_cmd_group_info, {
1275                 { "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
1276                 { "show", cmd_filesystem_show, cmd_filesystem_show_usage, NULL,
1277                         0 },
1278                 { "sync", cmd_filesystem_sync, cmd_filesystem_sync_usage, NULL,
1279                         0 },
1280                 { "defragment", cmd_filesystem_defrag,
1281                         cmd_filesystem_defrag_usage, NULL, 0 },
1282                 { "balance", cmd_balance, NULL, &balance_cmd_group,
1283                         CMD_HIDDEN },
1284                 { "resize", cmd_filesystem_resize, cmd_filesystem_resize_usage,
1285                         NULL, 0 },
1286                 { "label", cmd_filesystem_label, cmd_filesystem_label_usage,
1287                         NULL, 0 },
1288                 { "usage", cmd_filesystem_usage,
1289                         cmd_filesystem_usage_usage, NULL, 0 },
1290
1291                 NULL_CMD_STRUCT
1292         }
1293 };
1294
1295 int cmd_filesystem(int argc, char **argv)
1296 {
1297         return handle_command_group(&filesystem_cmd_group, argc, argv);
1298 }