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