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