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 #include "cmds-fi-du.h"
  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;
 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         if (ret < 0) {
 145                 error("cannot get space info: %s\n", strerror(errno));
 146                 free(sargs);
 147                 return -errno;
 148         }
 149         /* This really should never happen */
 150         if (!sargs->total_spaces) {
 151                 free(sargs);
 152                 return -ENOENT;
 153         }
 154         count = sargs->total_spaces;
 155         free(sargs);
 156
 157         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 158                         (count * sizeof(struct btrfs_ioctl_space_info)));
 159         if (!sargs)
 160                 return -ENOMEM;
 161
 162         sargs->space_slots = count;
 163         sargs->total_spaces = 0;
 164         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 165         if (ret < 0) {
 166                 error("cannot get space info with %llu slots: %s",
 167                                 count, strerror(errno));
 168                 free(sargs);
 169                 return -errno;
 170         }
 171         *sargs_ret = sargs;
 172         return 0;
 173 }
 174
 175 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
 176 {
 177         u64 i;
 178         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 179
 180         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 181                 printf("%s, %s: total=%s, used=%s\n",
 182                         btrfs_group_type_str(sp->flags),
 183                         btrfs_group_profile_str(sp->flags),
 184                         pretty_size_mode(sp->total_bytes, unit_mode),
 185                         pretty_size_mode(sp->used_bytes, unit_mode));
 186         }
 187 }
 188
 189 static int cmd_filesystem_df(int argc, char **argv)
 190 {
 191         struct btrfs_ioctl_space_args *sargs = NULL;
 192         int ret;
 193         int fd;
 194         char *path;
 195         DIR *dirstream = NULL;
 196         unsigned unit_mode;
 197
 198         unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
 199
 200         clean_args_no_options(argc, argv, cmd_filesystem_df_usage);
 201
 202         if (check_argc_exact(argc - optind, 1))
 203                 usage(cmd_filesystem_df_usage);
 204
 205         path = argv[optind];
 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                 free(dev_info_arg);
 461                 dev_info_arg = NULL;
 462                 if (strcmp(mnt->mnt_type, "btrfs"))
 463                         continue;
 464                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 465                                 &dev_info_arg);
 466                 if (ret)
 467                         goto out;
 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                         goto out;
 481
 482                 if (search && !match_search_item_kernel(fs_info_arg.fsid,
 483                                         mnt->mnt_dir, label, search)) {
 484                         continue;
 485                 }
 486
 487                 fd = open(mnt->mnt_dir, O_RDONLY);
 488                 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
 489                         print_one_fs(&fs_info_arg, dev_info_arg,
 490                                      space_info_arg, label, unit_mode);
 491                         kfree(space_info_arg);
 492                         memset(label, 0, sizeof(label));
 493                         found = 1;
 494                 }
 495                 if (fd != -1)
 496                         close(fd);
 497         }
 498
 499 out:
 500         free(dev_info_arg);
 501         endmntent(f);
 502         return !found;
 503 }
 504
 505 static int dev_to_fsid(char *dev, __u8 *fsid)
 506 {
 507         struct btrfs_super_block *disk_super;
 508         char buf[BTRFS_SUPER_INFO_SIZE];
 509         int ret;
 510         int fd;
 511
 512         fd = open(dev, O_RDONLY);
 513         if (fd < 0) {
 514                 ret = -errno;
 515                 return ret;
 516         }
 517
 518         disk_super = (struct btrfs_super_block *)buf;
 519         ret = btrfs_read_dev_super(fd, disk_super,
 520                                    BTRFS_SUPER_INFO_OFFSET, 0);
 521         if (ret)
 522                 goto out;
 523
 524         memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 525         ret = 0;
 526
 527 out:
 528         close(fd);
 529         return ret;
 530 }
 531
 532 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 533 {
 534         struct btrfs_fs_devices *cur_seed, *next_seed;
 535         struct btrfs_device *device;
 536
 537         while (!list_empty(&fs_devices->devices)) {
 538                 device = list_entry(fs_devices->devices.next,
 539                                         struct btrfs_device, dev_list);
 540                 list_del(&device->dev_list);
 541
 542                 free(device->name);
 543                 free(device->label);
 544                 free(device);
 545         }
 546
 547         /* free seed fs chain */
 548         cur_seed = fs_devices->seed;
 549         fs_devices->seed = NULL;
 550         while (cur_seed) {
 551                 next_seed = cur_seed->seed;
 552                 free(cur_seed);
 553
 554                 cur_seed = next_seed;
 555         }
 556
 557         list_del(&fs_devices->list);
 558         free(fs_devices);
 559 }
 560
 561 static int copy_device(struct btrfs_device *dst,
 562                        struct btrfs_device *src)
 563 {
 564         dst->devid = src->devid;
 565         memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
 566         if (src->name == NULL)
 567                 dst->name = NULL;
 568         else {
 569                 dst->name = strdup(src->name);
 570                 if (!dst->name)
 571                         return -ENOMEM;
 572         }
 573         if (src->label == NULL)
 574                 dst->label = NULL;
 575         else {
 576                 dst->label = strdup(src->label);
 577                 if (!dst->label) {
 578                         free(dst->name);
 579                         return -ENOMEM;
 580                 }
 581         }
 582         dst->total_devs = src->total_devs;
 583         dst->super_bytes_used = src->super_bytes_used;
 584         dst->total_bytes = src->total_bytes;
 585         dst->bytes_used = src->bytes_used;
 586         dst->generation = src->generation;
 587
 588         return 0;
 589 }
 590
 591 static int copy_fs_devices(struct btrfs_fs_devices *dst,
 592                            struct btrfs_fs_devices *src)
 593 {
 594         struct btrfs_device *cur_dev, *dev_copy;
 595         int ret = 0;
 596
 597         memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
 598         INIT_LIST_HEAD(&dst->devices);
 599         dst->seed = NULL;
 600
 601         list_for_each_entry(cur_dev, &src->devices, dev_list) {
 602                 dev_copy = malloc(sizeof(*dev_copy));
 603                 if (!dev_copy) {
 604                         ret = -ENOMEM;
 605                         break;
 606                 }
 607
 608                 ret = copy_device(dev_copy, cur_dev);
 609                 if (ret) {
 610                         free(dev_copy);
 611                         break;
 612                 }
 613
 614                 list_add(&dev_copy->dev_list, &dst->devices);
 615                 dev_copy->fs_devices = dst;
 616         }
 617
 618         return ret;
 619 }
 620
 621 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
 622                               struct btrfs_fs_devices *copy,
 623                               struct list_head *fs_uuids) {
 624         struct btrfs_fs_devices *cur_fs;
 625
 626         list_for_each_entry(cur_fs, fs_uuids, list)
 627                 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
 628                         return copy_fs_devices(copy, cur_fs);
 629
 630         return 1;
 631 }
 632
 633 static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
 634 {
 635         struct btrfs_device *device;
 636         int dev_cnt_total, dev_cnt = 0;
 637
 638         device = list_first_entry(&fs_devices->devices, struct btrfs_device,
 639                                   dev_list);
 640
 641         dev_cnt_total = device->total_devs;
 642
 643         list_for_each_entry(device, &fs_devices->devices, dev_list)
 644                 dev_cnt++;
 645
 646         return dev_cnt_total != dev_cnt;
 647 }
 648
 649 static int search_umounted_fs_uuids(struct list_head *all_uuids,
 650                                     char *search, int *found)
 651 {
 652         struct btrfs_fs_devices *cur_fs, *fs_copy;
 653         struct list_head *fs_uuids;
 654         int ret = 0;
 655
 656         fs_uuids = btrfs_scanned_uuids();
 657
 658         /*
 659          * The fs_uuids list is global, and open_ctree_* will
 660          * modify it, make a private copy here
 661          */
 662         list_for_each_entry(cur_fs, fs_uuids, list) {
 663                 /* don't bother handle all fs, if search target specified */
 664                 if (search) {
 665                         if (uuid_search(cur_fs, search) == 0)
 666                                 continue;
 667                         if (found)
 668                                 *found = 1;
 669                 }
 670
 671                 /* skip all fs already shown as mounted fs */
 672                 if (is_seen_fsid(cur_fs->fsid))
 673                         continue;
 674
 675                 fs_copy = calloc(1, sizeof(*fs_copy));
 676                 if (!fs_copy) {
 677                         ret = -ENOMEM;
 678                         goto out;
 679                 }
 680
 681                 ret = copy_fs_devices(fs_copy, cur_fs);
 682                 if (ret) {
 683                         free(fs_copy);
 684                         goto out;
 685                 }
 686
 687                 list_add(&fs_copy->list, all_uuids);
 688         }
 689
 690 out:
 691         return ret;
 692 }
 693
 694 static int map_seed_devices(struct list_head *all_uuids)
 695 {
 696         struct btrfs_fs_devices *cur_fs, *cur_seed;
 697         struct btrfs_fs_devices *seed_copy;
 698         struct btrfs_fs_devices *opened_fs;
 699         struct btrfs_device *device;
 700         struct btrfs_fs_info *fs_info;
 701         struct list_head *fs_uuids;
 702         int ret = 0;
 703
 704         fs_uuids = btrfs_scanned_uuids();
 705
 706         list_for_each_entry(cur_fs, all_uuids, list) {
 707                 device = list_first_entry(&cur_fs->devices,
 708                                                 struct btrfs_device, dev_list);
 709                 if (!device)
 710                         continue;
 711
 712                 /* skip fs without seeds */
 713                 if (!has_seed_devices(cur_fs))
 714                         continue;
 715
 716                 /*
 717                  * open_ctree_* detects seed/sprout mapping
 718                  */
 719                 fs_info = open_ctree_fs_info(device->name, 0, 0, 0,
 720                                                 OPEN_CTREE_PARTIAL);
 721                 if (!fs_info)
 722                         continue;
 723
 724                 /*
 725                  * copy the seed chain under the opened fs
 726                  */
 727                 opened_fs = fs_info->fs_devices;
 728                 cur_seed = cur_fs;
 729                 while (opened_fs->seed) {
 730                         seed_copy = malloc(sizeof(*seed_copy));
 731                         if (!seed_copy) {
 732                                 ret = -ENOMEM;
 733                                 goto fail_out;
 734                         }
 735                         ret = find_and_copy_seed(opened_fs->seed, seed_copy,
 736                                                  fs_uuids);
 737                         if (ret) {
 738                                 free(seed_copy);
 739                                 goto fail_out;
 740                         }
 741
 742                         cur_seed->seed = seed_copy;
 743
 744                         opened_fs = opened_fs->seed;
 745                         cur_seed = cur_seed->seed;
 746                 }
 747
 748                 close_ctree(fs_info->chunk_root);
 749         }
 750
 751 out:
 752         return ret;
 753 fail_out:
 754         close_ctree(fs_info->chunk_root);
 755         goto out;
 756 }
 757
 758 static const char * const cmd_filesystem_show_usage[] = {
 759         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 760         "Show the structure of a filesystem",
 761         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 762         "-m|--mounted       show only mounted btrfs",
 763         HELPINFO_UNITS_LONG,
 764         "If no argument is given, structure of all present filesystems is shown.",
 765         NULL
 766 };
 767
 768 static int cmd_filesystem_show(int argc, char **argv)
 769 {
 770         LIST_HEAD(all_uuids);
 771         struct btrfs_fs_devices *fs_devices;
 772         char *search = NULL;
 773         int ret;
 774         /* default, search both kernel and udev */
 775         int where = -1;
 776         int type = 0;
 777         char mp[PATH_MAX];
 778         char path[PATH_MAX];
 779         __u8 fsid[BTRFS_FSID_SIZE];
 780         char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 781         unsigned unit_mode;
 782         int found = 0;
 783
 784         unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
 785
 786         while (1) {
 787                 int c;
 788                 static const struct option long_options[] = {
 789                         { "all-devices", no_argument, NULL, 'd'},
 790                         { "mounted", no_argument, NULL, 'm'},
 791                         { NULL, 0, NULL, 0 }
 792                 };
 793
 794                 c = getopt_long(argc, argv, "dm", long_options, NULL);
 795                 if (c < 0)
 796                         break;
 797                 switch (c) {
 798                 case 'd':
 799                         where = BTRFS_SCAN_LBLKID;
 800                         break;
 801                 case 'm':
 802                         where = BTRFS_SCAN_MOUNTED;
 803                         break;
 804                 default:
 805                         usage(cmd_filesystem_show_usage);
 806                 }
 807         }
 808
 809         if (check_argc_max(argc, optind + 1))
 810                 usage(cmd_filesystem_show_usage);
 811
 812         if (argc > optind) {
 813                 search = argv[optind];
 814                 if (*search == 0)
 815                         usage(cmd_filesystem_show_usage);
 816                 type = check_arg_type(search);
 817
 818                 /*
 819                  * For search is a device:
 820                  *     realpath do /dev/mapper/XX => /dev/dm-X
 821                  *     which is required by BTRFS_SCAN_DEV
 822                  * For search is a mountpoint:
 823                  *     realpath do  /mnt/btrfs/  => /mnt/btrfs
 824                  *     which shall be recognized by btrfs_scan_kernel()
 825                  */
 826                 if (realpath(search, path))
 827                         search = path;
 828
 829                 /*
 830                  * Needs special handling if input arg is block dev And if
 831                  * input arg is mount-point just print it right away
 832                  */
 833                 if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
 834                         ret = get_btrfs_mount(search, mp, sizeof(mp));
 835                         if (!ret) {
 836                                 /* given block dev is mounted */
 837                                 search = mp;
 838                                 type = BTRFS_ARG_MNTPOINT;
 839                         } else {
 840                                 ret = dev_to_fsid(search, fsid);
 841                                 if (ret) {
 842                                         error("no btrfs on %s", search);
 843                                         return 1;
 844                                 }
 845                                 uuid_unparse(fsid, uuid_buf);
 846                                 search = uuid_buf;
 847                                 type = BTRFS_ARG_UUID;
 848                                 goto devs_only;
 849                         }
 850                 }
 851         }
 852
 853         if (where == BTRFS_SCAN_LBLKID)
 854                 goto devs_only;
 855
 856         /* show mounted btrfs */
 857         ret = btrfs_scan_kernel(search, unit_mode);
 858         if (search && !ret) {
 859                 /* since search is found we are done */
 860                 goto out;
 861         }
 862
 863         /* shows mounted only */
 864         if (where == BTRFS_SCAN_MOUNTED)
 865                 goto out;
 866
 867 devs_only:
 868         ret = btrfs_scan_lblkid();
 869
 870         if (ret) {
 871                 error("blkid device scan returned %d\n", ret);
 872                 return 1;
 873         }
 874
 875         ret = search_umounted_fs_uuids(&all_uuids, search, &found);
 876         if (ret < 0) {
 877                 error("searching target device returned error %d", ret);
 878                 return 1;
 879         }
 880
 881         /*
 882          * The seed/sprout mapping are not detected yet,
 883          * do mapping build for all umounted fs
 884          */
 885         ret = map_seed_devices(&all_uuids);
 886         if (ret) {
 887                 error("mapping seed devices returned error %d", ret);
 888                 return 1;
 889         }
 890
 891         list_for_each_entry(fs_devices, &all_uuids, list)
 892                 print_one_uuid(fs_devices, unit_mode);
 893
 894         if (search && !found)
 895                 ret = 1;
 896
 897         while (!list_empty(&all_uuids)) {
 898                 fs_devices = list_entry(all_uuids.next,
 899                                         struct btrfs_fs_devices, list);
 900                 free_fs_devices(fs_devices);
 901         }
 902 out:
 903         free_seen_fsid();
 904         return ret;
 905 }
 906
 907 static const char * const cmd_filesystem_sync_usage[] = {
 908         "btrfs filesystem sync <path>",
 909         "Force a sync on a filesystem",
 910         NULL
 911 };
 912
 913 static int cmd_filesystem_sync(int argc, char **argv)
 914 {
 915         int     fd, res, e;
 916         char    *path;
 917         DIR     *dirstream = NULL;
 918
 919         clean_args_no_options(argc, argv, cmd_filesystem_sync_usage);
 920
 921         if (check_argc_exact(argc - optind, 1))
 922                 usage(cmd_filesystem_sync_usage);
 923
 924         path = argv[optind];
 925
 926         fd = btrfs_open_dir(path, &dirstream, 1);
 927         if (fd < 0)
 928                 return 1;
 929
 930         res = ioctl(fd, BTRFS_IOC_SYNC);
 931         e = errno;
 932         close_file_or_dir(fd, dirstream);
 933         if( res < 0 ){
 934                 error("sync ioctl failed on '%s': %s", path, strerror(e));
 935                 return 1;
 936         }
 937
 938         return 0;
 939 }
 940
 941 static int parse_compress_type(char *s)
 942 {
 943         if (strcmp(optarg, "zlib") == 0)
 944                 return BTRFS_COMPRESS_ZLIB;
 945         else if (strcmp(optarg, "lzo") == 0)
 946                 return BTRFS_COMPRESS_LZO;
 947         else {
 948                 error("unknown compression type %s", s);
 949                 exit(1);
 950         };
 951 }
 952
 953 static const char * const cmd_filesystem_defrag_usage[] = {
 954         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
 955         "Defragment a file or a directory",
 956         "",
 957         "-v             be verbose",
 958         "-r             defragment files recursively",
 959         "-c[zlib,lzo]   compress the file while defragmenting",
 960         "-f             flush data to disk immediately after defragmenting",
 961         "-s start       defragment only from byte onward",
 962         "-l len         defragment only up to len bytes",
 963         "-t size        target extent size hint",
 964         NULL
 965 };
 966
 967 static int do_defrag(int fd, int fancy_ioctl,
 968                 struct btrfs_ioctl_defrag_range_args *range)
 969 {
 970         int ret;
 971
 972         if (!fancy_ioctl)
 973                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
 974         else
 975                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
 976
 977         return ret;
 978 }
 979
 980 static int defrag_global_fancy_ioctl;
 981 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
 982 static int defrag_global_verbose;
 983 static int defrag_global_errors;
 984 static int defrag_callback(const char *fpath, const struct stat *sb,
 985                 int typeflag, struct FTW *ftwbuf)
 986 {
 987         int ret = 0;
 988         int e = 0;
 989         int fd = 0;
 990
 991         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
 992                 if (defrag_global_verbose)
 993                         printf("%s\n", fpath);
 994                 fd = open(fpath, O_RDWR);
 995                 if (fd < 0)
 996                         goto error;
 997                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
 998                 e = errno;
 999                 close(fd);
1000                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1001                         error("defrag range ioctl not "
1002                                 "supported in this kernel, please try "
1003                                 "without any options.");
1004                         defrag_global_errors++;
1005                         return ENOTTY;
1006                 }
1007                 if (ret)
1008                         goto error;
1009         }
1010         return 0;
1011
1012 error:
1013         error("defrag failed on %s: %s", fpath, strerror(e));
1014         defrag_global_errors++;
1015         return 0;
1016 }
1017
1018 static int cmd_filesystem_defrag(int argc, char **argv)
1019 {
1020         int fd;
1021         int flush = 0;
1022         u64 start = 0;
1023         u64 len = (u64)-1;
1024         u64 thresh = 0;
1025         int i;
1026         int recursive = 0;
1027         int ret = 0;
1028         int e = 0;
1029         int compress_type = BTRFS_COMPRESS_NONE;
1030         DIR *dirstream;
1031
1032         defrag_global_errors = 0;
1033         defrag_global_verbose = 0;
1034         defrag_global_errors = 0;
1035         defrag_global_fancy_ioctl = 0;
1036         optind = 1;
1037         while(1) {
1038                 int c = getopt(argc, argv, "vrc::fs:l:t:");
1039                 if (c < 0)
1040                         break;
1041
1042                 switch(c) {
1043                 case 'c':
1044                         compress_type = BTRFS_COMPRESS_ZLIB;
1045                         if (optarg)
1046                                 compress_type = parse_compress_type(optarg);
1047                         defrag_global_fancy_ioctl = 1;
1048                         break;
1049                 case 'f':
1050                         flush = 1;
1051                         defrag_global_fancy_ioctl = 1;
1052                         break;
1053                 case 'v':
1054                         defrag_global_verbose = 1;
1055                         break;
1056                 case 's':
1057                         start = parse_size(optarg);
1058                         defrag_global_fancy_ioctl = 1;
1059                         break;
1060                 case 'l':
1061                         len = parse_size(optarg);
1062                         defrag_global_fancy_ioctl = 1;
1063                         break;
1064                 case 't':
1065                         thresh = parse_size(optarg);
1066                         if (thresh > (u32)-1) {
1067                                 warning(
1068                             "target extent size %llu too big, trimmed to %u",
1069                                         thresh, (u32)-1);
1070                                 thresh = (u32)-1;
1071                         }
1072                         defrag_global_fancy_ioctl = 1;
1073                         break;
1074                 case 'r':
1075                         recursive = 1;
1076                         break;
1077                 default:
1078                         usage(cmd_filesystem_defrag_usage);
1079                 }
1080         }
1081
1082         if (check_argc_min(argc - optind, 1))
1083                 usage(cmd_filesystem_defrag_usage);
1084
1085         memset(&defrag_global_range, 0, sizeof(defrag_global_range));
1086         defrag_global_range.start = start;
1087         defrag_global_range.len = len;
1088         defrag_global_range.extent_thresh = (u32)thresh;
1089         if (compress_type) {
1090                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1091                 defrag_global_range.compress_type = compress_type;
1092         }
1093         if (flush)
1094                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1095
1096         for (i = optind; i < argc; i++) {
1097                 struct stat st;
1098
1099                 dirstream = NULL;
1100                 fd = open_file_or_dir(argv[i], &dirstream);
1101                 if (fd < 0) {
1102                         error("cannot open %s: %s\n", argv[i],
1103                                         strerror(errno));
1104                         defrag_global_errors++;
1105                         close_file_or_dir(fd, dirstream);
1106                         continue;
1107                 }
1108                 if (fstat(fd, &st)) {
1109                         error("failed to stat %s: %s",
1110                                         argv[i], strerror(errno));
1111                         defrag_global_errors++;
1112                         close_file_or_dir(fd, dirstream);
1113                         continue;
1114                 }
1115                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1116                         error("%s is not a directory or a regular file\n",
1117                                         argv[i]);
1118                         defrag_global_errors++;
1119                         close_file_or_dir(fd, dirstream);
1120                         continue;
1121                 }
1122                 if (recursive) {
1123                         if (S_ISDIR(st.st_mode)) {
1124                                 ret = nftw(argv[i], defrag_callback, 10,
1125                                                 FTW_MOUNT | FTW_PHYS);
1126                                 if (ret == ENOTTY)
1127                                         exit(1);
1128                                 /* errors are handled in the callback */
1129                                 ret = 0;
1130                         } else {
1131                                 if (defrag_global_verbose)
1132                                         printf("%s\n", argv[i]);
1133                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1134                                                 &defrag_global_range);
1135                                 e = errno;
1136                         }
1137                 } else {
1138                         if (defrag_global_verbose)
1139                                 printf("%s\n", argv[i]);
1140                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
1141                                         &defrag_global_range);
1142                         e = errno;
1143                 }
1144                 close_file_or_dir(fd, dirstream);
1145                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1146                         error("defrag range ioctl not "
1147                                 "supported in this kernel, please try "
1148                                 "without any options.");
1149                         defrag_global_errors++;
1150                         break;
1151                 }
1152                 if (ret) {
1153                         error("defrag failed on %s: %s", argv[i], strerror(e));
1154                         defrag_global_errors++;
1155                 }
1156         }
1157         if (defrag_global_errors)
1158                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1159
1160         return !!defrag_global_errors;
1161 }
1162
1163 static const char * const cmd_filesystem_resize_usage[] = {
1164         "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1165         "Resize a filesystem",
1166         "If 'max' is passed, the filesystem will occupy all available space",
1167         "on the device 'devid'.",
1168         "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1169         NULL
1170 };
1171
1172 static int cmd_filesystem_resize(int argc, char **argv)
1173 {
1174         struct btrfs_ioctl_vol_args     args;
1175         int     fd, res, len, e;
1176         char    *amount, *path;
1177         DIR     *dirstream = NULL;
1178         struct stat st;
1179
1180         clean_args_no_options(argc, argv, cmd_filesystem_resize_usage);
1181
1182         if (check_argc_exact(argc - optind, 2))
1183                 usage(cmd_filesystem_resize_usage);
1184
1185         amount = argv[optind];
1186         path = argv[optind + 1];
1187
1188         len = strlen(amount);
1189         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1190                 error("resize value too long (%s)", amount);
1191                 return 1;
1192         }
1193
1194         res = stat(path, &st);
1195         if (res < 0) {
1196                 error("resize: cannot stat %s: %s", path, strerror(errno));
1197                 return 1;
1198         }
1199         if (!S_ISDIR(st.st_mode)) {
1200                 error("resize works on mounted filesystems and accepts only\n"
1201                         "directories as argument. Passing file containing a btrfs image\n"
1202                         "would resize the underlying filesystem instead of the image.\n");
1203                 return 1;
1204         }
1205
1206         fd = btrfs_open_dir(path, &dirstream, 1);
1207         if (fd < 0)
1208                 return 1;
1209
1210         printf("Resize '%s' of '%s'\n", path, amount);
1211         memset(&args, 0, sizeof(args));
1212         strncpy_null(args.name, amount);
1213         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1214         e = errno;
1215         close_file_or_dir(fd, dirstream);
1216         if( res < 0 ){
1217                 switch (e) {
1218                 case EFBIG:
1219                         error("unable to resize '%s': no enough free space",
1220                                 path);
1221                         break;
1222                 default:
1223                         error("unable to resize '%s': %s", path, strerror(e));
1224                         break;
1225                 }
1226                 return 1;
1227         } else if (res > 0) {
1228                 const char *err_str = btrfs_err_str(res);
1229
1230                 if (err_str) {
1231                         error("resizing of '%s' failed: %s", path, err_str);
1232                 } else {
1233                         error("resizing of '%s' failed: unknown error %d",
1234                                 path, res);
1235                 }
1236                 return 1;
1237         }
1238         return 0;
1239 }
1240
1241 static const char * const cmd_filesystem_label_usage[] = {
1242         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1243         "Get or change the label of a filesystem",
1244         "With one argument, get the label of filesystem on <device>.",
1245         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1246         NULL
1247 };
1248
1249 static int cmd_filesystem_label(int argc, char **argv)
1250 {
1251         clean_args_no_options(argc, argv, cmd_filesystem_label_usage);
1252
1253         if (check_argc_min(argc - optind, 1) ||
1254                         check_argc_max(argc - optind, 2))
1255                 usage(cmd_filesystem_label_usage);
1256
1257         if (argc - optind > 1) {
1258                 return set_label(argv[optind], argv[optind + 1]);
1259         } else {
1260                 char label[BTRFS_LABEL_SIZE];
1261                 int ret;
1262
1263                 ret = get_label(argv[optind], label);
1264                 if (!ret)
1265                         fprintf(stdout, "%s\n", label);
1266
1267                 return ret;
1268         }
1269 }
1270
1271 static const char filesystem_cmd_group_info[] =
1272 "overall filesystem tasks and information";
1273
1274 const struct cmd_group filesystem_cmd_group = {
1275         filesystem_cmd_group_usage, filesystem_cmd_group_info, {
1276                 { "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
1277                 { "du", cmd_filesystem_du, cmd_filesystem_du_usage, NULL, 0 },
1278                 { "show", cmd_filesystem_show, cmd_filesystem_show_usage, NULL,
1279                         0 },
1280                 { "sync", cmd_filesystem_sync, cmd_filesystem_sync_usage, NULL,
1281                         0 },
1282                 { "defragment", cmd_filesystem_defrag,
1283                         cmd_filesystem_defrag_usage, NULL, 0 },
1284                 { "balance", cmd_balance, NULL, &balance_cmd_group,
1285                         CMD_HIDDEN },
1286                 { "resize", cmd_filesystem_resize, cmd_filesystem_resize_usage,
1287                         NULL, 0 },
1288                 { "label", cmd_filesystem_label, cmd_filesystem_label_usage,
1289                         NULL, 0 },
1290                 { "usage", cmd_filesystem_usage,
1291                         cmd_filesystem_usage_usage, NULL, 0 },
1292
1293                 NULL_CMD_STRUCT
1294         }
1295 };
1296
1297 int cmd_filesystem(int argc, char **argv)
1298 {
1299         return handle_command_group(&filesystem_cmd_group, argc, argv);
1300 }