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_OUTPUT_UNIT_DF,
 127         NULL
 128 };
 129
 130 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 131 {
 132         u64 count = 0;
 133         int ret, e;
 134         struct btrfs_ioctl_space_args *sargs;
 135
 136         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 137         if (!sargs)
 138                 return -ENOMEM;
 139
 140         sargs->space_slots = 0;
 141         sargs->total_spaces = 0;
 142
 143         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 144         e = errno;
 145         if (ret) {
 146                 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
 147                         strerror(e));
 148                 free(sargs);
 149                 return -e;
 150         }
 151         /* This really should never happen */
 152         if (!sargs->total_spaces) {
 153                 free(sargs);
 154                 return -ENOENT;
 155         }
 156         count = sargs->total_spaces;
 157         free(sargs);
 158
 159         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 160                         (count * sizeof(struct btrfs_ioctl_space_info)));
 161         if (!sargs)
 162                 return -ENOMEM;
 163
 164         sargs->space_slots = count;
 165         sargs->total_spaces = 0;
 166         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 167         e = errno;
 168         if (ret) {
 169                 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
 170                                 count, strerror(e));
 171                 free(sargs);
 172                 return -e;
 173         }
 174         *sargs_ret = sargs;
 175         return 0;
 176 }
 177
 178 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
 179 {
 180         u64 i;
 181         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 182
 183         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 184                 printf("%s, %s: total=%s, used=%s\n",
 185                         btrfs_group_type_str(sp->flags),
 186                         btrfs_group_profile_str(sp->flags),
 187                         pretty_size_mode(sp->total_bytes, unit_mode),
 188                         pretty_size_mode(sp->used_bytes, unit_mode));
 189         }
 190 }
 191
 192 static int cmd_filesystem_df(int argc, char **argv)
 193 {
 194         struct btrfs_ioctl_space_args *sargs = NULL;
 195         int ret;
 196         int fd;
 197         char *path;
 198         DIR *dirstream = NULL;
 199         unsigned unit_mode;
 200
 201         unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
 202
 203         if (argc != 2 || argv[1][0] == '-')
 204                 usage(cmd_filesystem_df_usage);
 205
 206         path = argv[1];
 207
 208         fd = open_file_or_dir(path, &dirstream);
 209         if (fd < 0) {
 210                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 211                 return 1;
 212         }
 213         ret = get_df(fd, &sargs);
 214
 215         if (ret == 0) {
 216                 print_df(sargs, unit_mode);
 217                 free(sargs);
 218         } else {
 219                 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
 220         }
 221
 222         close_file_or_dir(fd, dirstream);
 223         return !!ret;
 224 }
 225
 226 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
 227                                         char *search)
 228 {
 229         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 230         int search_len = strlen(search);
 231
 232         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 233         uuid_unparse(fsid, uuidbuf);
 234         if (!strncmp(uuidbuf, search, search_len))
 235                 return 1;
 236
 237         if (strlen(label) && strcmp(label, search) == 0)
 238                 return 1;
 239
 240         if (strcmp(mnt, search) == 0)
 241                 return 1;
 242
 243         return 0;
 244 }
 245
 246 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 247 {
 248         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 249         struct list_head *cur;
 250         struct btrfs_device *device;
 251         int search_len = strlen(search);
 252
 253         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 254         uuid_unparse(fs_devices->fsid, uuidbuf);
 255         if (!strncmp(uuidbuf, search, search_len))
 256                 return 1;
 257
 258         list_for_each(cur, &fs_devices->devices) {
 259                 device = list_entry(cur, struct btrfs_device, dev_list);
 260                 if ((device->label && strcmp(device->label, search) == 0) ||
 261                     strcmp(device->name, search) == 0)
 262                         return 1;
 263         }
 264         return 0;
 265 }
 266
 267 /*
 268  * Sort devices by devid, ascending
 269  */
 270 static int cmp_device_id(void *priv, struct list_head *a,
 271                 struct list_head *b)
 272 {
 273         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 274                         dev_list);
 275         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 276                         dev_list);
 277
 278         return da->devid < db->devid ? -1 :
 279                 da->devid > db->devid ? 1 : 0;
 280 }
 281
 282 static void splice_device_list(struct list_head *seed_devices,
 283                                struct list_head *all_devices)
 284 {
 285         struct btrfs_device *in_all, *next_all;
 286         struct btrfs_device *in_seed, *next_seed;
 287
 288         list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
 289                 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
 290                                                                 dev_list) {
 291                         if (in_all->devid == in_seed->devid) {
 292                                 /*
 293                                  * When do dev replace in a sprout fs
 294                                  * to a dev in its seed fs, the replacing
 295                                  * dev will reside in the sprout fs and
 296                                  * the replaced dev will still exist
 297                                  * in the seed fs.
 298                                  * So pick the latest one when showing
 299                                  * the sprout fs.
 300                                  */
 301                                 if (in_all->generation
 302                                                 < in_seed->generation) {
 303                                         list_del(&in_all->dev_list);
 304                                         free(in_all);
 305                                 } else if (in_all->generation
 306                                                 > in_seed->generation) {
 307                                         list_del(&in_seed->dev_list);
 308                                         free(in_seed);
 309                                 }
 310                                 break;
 311                         }
 312                 }
 313         }
 314
 315         list_splice(seed_devices, all_devices);
 316 }
 317
 318 static void print_devices(struct btrfs_fs_devices *fs_devices,
 319                           u64 *devs_found, unsigned unit_mode)
 320 {
 321         struct btrfs_device *device;
 322         struct btrfs_fs_devices *cur_fs;
 323         struct list_head *all_devices;
 324
 325         all_devices = &fs_devices->devices;
 326         cur_fs = fs_devices->seed;
 327         /* add all devices of seed fs to the fs to be printed */
 328         while (cur_fs) {
 329                 splice_device_list(&cur_fs->devices, all_devices);
 330                 cur_fs = cur_fs->seed;
 331         }
 332
 333         list_sort(NULL, all_devices, cmp_device_id);
 334         list_for_each_entry(device, all_devices, dev_list) {
 335                 printf("\tdevid %4llu size %s used %s path %s\n",
 336                        (unsigned long long)device->devid,
 337                        pretty_size_mode(device->total_bytes, unit_mode),
 338                        pretty_size_mode(device->bytes_used, unit_mode),
 339                        device->name);
 340
 341                 (*devs_found)++;
 342         }
 343 }
 344
 345 static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
 346                            unsigned unit_mode)
 347 {
 348         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 349         struct btrfs_device *device;
 350         u64 devs_found = 0;
 351         u64 total;
 352
 353         if (add_seen_fsid(fs_devices->fsid))
 354                 return;
 355
 356         uuid_unparse(fs_devices->fsid, uuidbuf);
 357         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 358                             dev_list);
 359         if (device->label && device->label[0])
 360                 printf("Label: '%s' ", device->label);
 361         else
 362                 printf("Label: none ");
 363
 364         total = device->total_devs;
 365         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 366                (unsigned long long)total,
 367                pretty_size_mode(device->super_bytes_used, unit_mode));
 368
 369         print_devices(fs_devices, &devs_found, unit_mode);
 370
 371         if (devs_found < total) {
 372                 printf("\t*** Some devices missing\n");
 373         }
 374         printf("\n");
 375 }
 376
 377 /* adds up all the used spaces as reported by the space info ioctl
 378  */
 379 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 380 {
 381         u64 ret = 0;
 382         int i;
 383         for (i = 0; i < si->total_spaces; i++)
 384                 ret += si->spaces[i].used_bytes;
 385         return ret;
 386 }
 387
 388 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 389                 struct btrfs_ioctl_dev_info_args *dev_info,
 390                 struct btrfs_ioctl_space_args *space_info,
 391                 char *label, char *path, unsigned unit_mode)
 392 {
 393         int i;
 394         int fd;
 395         int missing = 0;
 396         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 397         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 398         int ret;
 399
 400         ret = add_seen_fsid(fs_info->fsid);
 401         if (ret == -EEXIST)
 402                 return 0;
 403         else if (ret)
 404                 return ret;
 405
 406         uuid_unparse(fs_info->fsid, uuidbuf);
 407         if (label && strlen(label))
 408                 printf("Label: '%s' ", label);
 409         else
 410                 printf("Label: none ");
 411
 412         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 413                         fs_info->num_devices,
 414                         pretty_size_mode(calc_used_bytes(space_info),
 415                                          unit_mode));
 416
 417         for (i = 0; i < fs_info->num_devices; i++) {
 418                 char *canonical_path;
 419
 420                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 421
 422                 /* Add check for missing devices even mounted */
 423                 fd = open((char *)tmp_dev_info->path, O_RDONLY);
 424                 if (fd < 0) {
 425                         missing = 1;
 426                         continue;
 427                 }
 428                 close(fd);
 429                 canonical_path = canonicalize_path((char *)tmp_dev_info->path);
 430                 printf("\tdevid %4llu size %s used %s path %s\n",
 431                         tmp_dev_info->devid,
 432                         pretty_size_mode(tmp_dev_info->total_bytes, unit_mode),
 433                         pretty_size_mode(tmp_dev_info->bytes_used, unit_mode),
 434                         canonical_path);
 435
 436                 free(canonical_path);
 437         }
 438
 439         if (missing)
 440                 printf("\t*** Some devices missing\n");
 441         printf("\n");
 442         return 0;
 443 }
 444
 445 static int btrfs_scan_kernel(void *search, unsigned unit_mode)
 446 {
 447         int ret = 0, fd;
 448         int found = 0;
 449         FILE *f;
 450         struct mntent *mnt;
 451         struct btrfs_ioctl_fs_info_args fs_info_arg;
 452         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 453         struct btrfs_ioctl_space_args *space_info_arg = NULL;
 454         char label[BTRFS_LABEL_SIZE];
 455
 456         f = setmntent("/proc/self/mounts", "r");
 457         if (f == NULL)
 458                 return 1;
 459
 460         memset(label, 0, sizeof(label));
 461         while ((mnt = getmntent(f)) != 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                         kfree(dev_info_arg);
 468                         goto out;
 469                 }
 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, mnt->mnt_dir,
 492                                      unit_mode);
 493                         kfree(space_info_arg);
 494                         memset(label, 0, sizeof(label));
 495                         found = 1;
 496                 }
 497                 if (fd != -1)
 498                         close(fd);
 499                 kfree(dev_info_arg);
 500                 dev_info_arg = NULL;
 501         }
 502
 503 out:
 504         endmntent(f);
 505         return !found;
 506 }
 507
 508 static int dev_to_fsid(char *dev, __u8 *fsid)
 509 {
 510         struct btrfs_super_block *disk_super;
 511         char *buf;
 512         int ret;
 513         int fd;
 514
 515         buf = malloc(4096);
 516         if (!buf)
 517                 return -ENOMEM;
 518
 519         fd = open(dev, O_RDONLY);
 520         if (fd < 0) {
 521                 ret = -errno;
 522                 free(buf);
 523                 return ret;
 524         }
 525
 526         disk_super = (struct btrfs_super_block *)buf;
 527         ret = btrfs_read_dev_super(fd, disk_super,
 528                                    BTRFS_SUPER_INFO_OFFSET, 0);
 529         if (ret)
 530                 goto out;
 531
 532         memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 533         ret = 0;
 534
 535 out:
 536         close(fd);
 537         free(buf);
 538         return ret;
 539 }
 540
 541 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 542 {
 543         struct btrfs_fs_devices *cur_seed, *next_seed;
 544         struct btrfs_device *device;
 545
 546         while (!list_empty(&fs_devices->devices)) {
 547                 device = list_entry(fs_devices->devices.next,
 548                                         struct btrfs_device, dev_list);
 549                 list_del(&device->dev_list);
 550
 551                 free(device->name);
 552                 free(device->label);
 553                 free(device);
 554         }
 555
 556         /* free seed fs chain */
 557         cur_seed = fs_devices->seed;
 558         fs_devices->seed = NULL;
 559         while (cur_seed) {
 560                 next_seed = cur_seed->seed;
 561                 free(cur_seed);
 562
 563                 cur_seed = next_seed;
 564         }
 565
 566         list_del(&fs_devices->list);
 567         free(fs_devices);
 568 }
 569
 570 static int copy_device(struct btrfs_device *dst,
 571                        struct btrfs_device *src)
 572 {
 573         dst->devid = src->devid;
 574         memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
 575         if (src->name == NULL)
 576                 dst->name = NULL;
 577         else {
 578                 dst->name = strdup(src->name);
 579                 if (!dst->name)
 580                         return -ENOMEM;
 581         }
 582         if (src->label == NULL)
 583                 dst->label = NULL;
 584         else {
 585                 dst->label = strdup(src->label);
 586                 if (!dst->label) {
 587                         free(dst->name);
 588                         return -ENOMEM;
 589                 }
 590         }
 591         dst->total_devs = src->total_devs;
 592         dst->super_bytes_used = src->super_bytes_used;
 593         dst->total_bytes = src->total_bytes;
 594         dst->bytes_used = src->bytes_used;
 595         dst->generation = src->generation;
 596
 597         return 0;
 598 }
 599
 600 static int copy_fs_devices(struct btrfs_fs_devices *dst,
 601                            struct btrfs_fs_devices *src)
 602 {
 603         struct btrfs_device *cur_dev, *dev_copy;
 604         int ret = 0;
 605
 606         memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
 607         INIT_LIST_HEAD(&dst->devices);
 608         dst->seed = NULL;
 609
 610         list_for_each_entry(cur_dev, &src->devices, dev_list) {
 611                 dev_copy = malloc(sizeof(*dev_copy));
 612                 if (!dev_copy) {
 613                         ret = -ENOMEM;
 614                         break;
 615                 }
 616
 617                 ret = copy_device(dev_copy, cur_dev);
 618                 if (ret) {
 619                         free(dev_copy);
 620                         break;
 621                 }
 622
 623                 list_add(&dev_copy->dev_list, &dst->devices);
 624                 dev_copy->fs_devices = dst;
 625         }
 626
 627         return ret;
 628 }
 629
 630 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
 631                               struct btrfs_fs_devices *copy,
 632                               struct list_head *fs_uuids) {
 633         struct btrfs_fs_devices *cur_fs;
 634
 635         list_for_each_entry(cur_fs, fs_uuids, list)
 636                 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
 637                         return copy_fs_devices(copy, cur_fs);
 638
 639         return 1;
 640 }
 641
 642 static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
 643 {
 644         struct btrfs_device *device;
 645         int dev_cnt_total, dev_cnt = 0;
 646
 647         device = list_first_entry(&fs_devices->devices, struct btrfs_device,
 648                                   dev_list);
 649
 650         dev_cnt_total = device->total_devs;
 651
 652         list_for_each_entry(device, &fs_devices->devices, dev_list)
 653                 dev_cnt++;
 654
 655         return dev_cnt_total != dev_cnt;
 656 }
 657
 658 static int search_umounted_fs_uuids(struct list_head *all_uuids,
 659                                     char *search, int *found)
 660 {
 661         struct btrfs_fs_devices *cur_fs, *fs_copy;
 662         struct list_head *fs_uuids;
 663         int ret = 0;
 664
 665         fs_uuids = btrfs_scanned_uuids();
 666
 667         /*
 668          * The fs_uuids list is global, and open_ctree_* will
 669          * modify it, make a private copy here
 670          */
 671         list_for_each_entry(cur_fs, fs_uuids, list) {
 672                 /* don't bother handle all fs, if search target specified */
 673                 if (search) {
 674                         if (uuid_search(cur_fs, search) == 0)
 675                                 continue;
 676                         if (found)
 677                                 *found = 1;
 678                 }
 679
 680                 /* skip all fs already shown as mounted fs */
 681                 if (is_seen_fsid(cur_fs->fsid))
 682                         continue;
 683
 684                 fs_copy = malloc(sizeof(*fs_copy));
 685                 if (!fs_copy) {
 686                         ret = -ENOMEM;
 687                         goto out;
 688                 }
 689
 690                 ret = copy_fs_devices(fs_copy, cur_fs);
 691                 if (ret) {
 692                         free(fs_copy);
 693                         goto out;
 694                 }
 695
 696                 list_add(&fs_copy->list, all_uuids);
 697         }
 698
 699 out:
 700         return ret;
 701 }
 702
 703 static int map_seed_devices(struct list_head *all_uuids)
 704 {
 705         struct btrfs_fs_devices *cur_fs, *cur_seed;
 706         struct btrfs_fs_devices *seed_copy;
 707         struct btrfs_fs_devices *opened_fs;
 708         struct btrfs_device *device;
 709         struct btrfs_fs_info *fs_info;
 710         struct list_head *fs_uuids;
 711         int ret = 0;
 712
 713         fs_uuids = btrfs_scanned_uuids();
 714
 715         list_for_each_entry(cur_fs, all_uuids, list) {
 716                 device = list_first_entry(&cur_fs->devices,
 717                                                 struct btrfs_device, dev_list);
 718                 if (!device)
 719                         continue;
 720
 721                 /* skip fs without seeds */
 722                 if (!has_seed_devices(cur_fs))
 723                         continue;
 724
 725                 /*
 726                  * open_ctree_* detects seed/sprout mapping
 727                  */
 728                 fs_info = open_ctree_fs_info(device->name, 0, 0,
 729                                                 OPEN_CTREE_PARTIAL);
 730                 if (!fs_info)
 731                         continue;
 732
 733                 /*
 734                  * copy the seed chain under the opened fs
 735                  */
 736                 opened_fs = fs_info->fs_devices;
 737                 cur_seed = cur_fs;
 738                 while (opened_fs->seed) {
 739                         seed_copy = malloc(sizeof(*seed_copy));
 740                         if (!seed_copy) {
 741                                 ret = -ENOMEM;
 742                                 goto fail_out;
 743                         }
 744                         ret = find_and_copy_seed(opened_fs->seed, seed_copy,
 745                                                  fs_uuids);
 746                         if (ret) {
 747                                 free(seed_copy);
 748                                 goto fail_out;
 749                         }
 750
 751                         cur_seed->seed = seed_copy;
 752
 753                         opened_fs = opened_fs->seed;
 754                         cur_seed = cur_seed->seed;
 755                 }
 756
 757                 close_ctree(fs_info->chunk_root);
 758         }
 759
 760 out:
 761         return ret;
 762 fail_out:
 763         close_ctree(fs_info->chunk_root);
 764         goto out;
 765 }
 766
 767 static const char * const cmd_filesystem_show_usage[] = {
 768         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 769         "Show the structure of a filesystem",
 770         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 771         "-m|--mounted       show only mounted btrfs",
 772         HELPINFO_OUTPUT_UNIT,
 773         "If no argument is given, structure of all present filesystems is shown.",
 774         NULL
 775 };
 776
 777 static int cmd_filesystem_show(int argc, char **argv)
 778 {
 779         LIST_HEAD(all_uuids);
 780         struct btrfs_fs_devices *fs_devices;
 781         char *search = NULL;
 782         int ret;
 783         /* default, search both kernel and udev */
 784         int where = -1;
 785         int type = 0;
 786         char mp[PATH_MAX];
 787         char path[PATH_MAX];
 788         __u8 fsid[BTRFS_FSID_SIZE];
 789         char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 790         unsigned unit_mode;
 791         int found = 0;
 792
 793         unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
 794
 795         while (1) {
 796                 int c;
 797                 static const struct option long_options[] = {
 798                         { "all-devices", no_argument, NULL, 'd'},
 799                         { "mounted", no_argument, NULL, 'm'},
 800                         { NULL, 0, NULL, 0 }
 801                 };
 802
 803                 c = getopt_long(argc, argv, "dm", long_options, NULL);
 804                 if (c < 0)
 805                         break;
 806                 switch (c) {
 807                 case 'd':
 808                         where = BTRFS_SCAN_LBLKID;
 809                         break;
 810                 case 'm':
 811                         where = BTRFS_SCAN_MOUNTED;
 812                         break;
 813                 default:
 814                         usage(cmd_filesystem_show_usage);
 815                 }
 816         }
 817
 818         if (check_argc_max(argc, optind + 1))
 819                 usage(cmd_filesystem_show_usage);
 820
 821         if (argc > optind) {
 822                 search = argv[optind];
 823                 if (strlen(search) == 0)
 824                         usage(cmd_filesystem_show_usage);
 825                 type = check_arg_type(search);
 826
 827                 /*
 828                  * For search is a device:
 829                  *     realpath do /dev/mapper/XX => /dev/dm-X
 830                  *     which is required by BTRFS_SCAN_DEV
 831                  * For search is a mountpoint:
 832                  *     realpath do  /mnt/btrfs/  => /mnt/btrfs
 833                  *     which shall be recognized by btrfs_scan_kernel()
 834                  */
 835                 if (realpath(search, path))
 836                         search = path;
 837
 838                 /*
 839                  * Needs special handling if input arg is block dev And if
 840                  * input arg is mount-point just print it right away
 841                  */
 842                 if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
 843                         ret = get_btrfs_mount(search, mp, sizeof(mp));
 844                         if (!ret) {
 845                                 /* given block dev is mounted */
 846                                 search = mp;
 847                                 type = BTRFS_ARG_MNTPOINT;
 848                         } else {
 849                                 ret = dev_to_fsid(search, fsid);
 850                                 if (ret) {
 851                                         fprintf(stderr,
 852                                                 "ERROR: No btrfs on %s\n",
 853                                                 search);
 854                                         return 1;
 855                                 }
 856                                 uuid_unparse(fsid, uuid_buf);
 857                                 search = uuid_buf;
 858                                 type = BTRFS_ARG_UUID;
 859                                 goto devs_only;
 860                         }
 861                 }
 862         }
 863
 864         if (where == BTRFS_SCAN_LBLKID)
 865                 goto devs_only;
 866
 867         /* show mounted btrfs */
 868         ret = btrfs_scan_kernel(search, unit_mode);
 869         if (search && !ret) {
 870                 /* since search is found we are done */
 871                 goto out;
 872         }
 873
 874         /* shows mounted only */
 875         if (where == BTRFS_SCAN_MOUNTED)
 876                 goto out;
 877
 878 devs_only:
 879         ret = btrfs_scan_lblkid();
 880
 881         if (ret) {
 882                 fprintf(stderr, "ERROR: %d while scanning\n", ret);
 883                 return 1;
 884         }
 885
 886         ret = search_umounted_fs_uuids(&all_uuids, search, &found);
 887         if (ret < 0) {
 888                 fprintf(stderr,
 889                         "ERROR: %d while searching target device\n", ret);
 890                 return 1;
 891         }
 892
 893         /*
 894          * The seed/sprout mapping are not detected yet,
 895          * do mapping build for all umounted fs
 896          */
 897         ret = map_seed_devices(&all_uuids);
 898         if (ret) {
 899                 fprintf(stderr,
 900                         "ERROR: %d while mapping seed devices\n", ret);
 901                 return 1;
 902         }
 903
 904         list_for_each_entry(fs_devices, &all_uuids, list)
 905                 print_one_uuid(fs_devices, unit_mode);
 906
 907         if (search && !found)
 908                 ret = 1;
 909
 910         while (!list_empty(&all_uuids)) {
 911                 fs_devices = list_entry(all_uuids.next,
 912                                         struct btrfs_fs_devices, list);
 913                 free_fs_devices(fs_devices);
 914         }
 915 out:
 916         printf("%s\n", PACKAGE_STRING);
 917         free_seen_fsid();
 918         return ret;
 919 }
 920
 921 static const char * const cmd_filesystem_sync_usage[] = {
 922         "btrfs filesystem sync <path>",
 923         "Force a sync on a filesystem",
 924         NULL
 925 };
 926
 927 static int cmd_filesystem_sync(int argc, char **argv)
 928 {
 929         int     fd, res, e;
 930         char    *path;
 931         DIR     *dirstream = NULL;
 932
 933         if (check_argc_exact(argc, 2))
 934                 usage(cmd_filesystem_sync_usage);
 935
 936         path = argv[1];
 937
 938         fd = open_file_or_dir(path, &dirstream);
 939         if (fd < 0) {
 940                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 941                 return 1;
 942         }
 943
 944         printf("FSSync '%s'\n", path);
 945         res = ioctl(fd, BTRFS_IOC_SYNC);
 946         e = errno;
 947         close_file_or_dir(fd, dirstream);
 948         if( res < 0 ){
 949                 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
 950                         path, strerror(e));
 951                 return 1;
 952         }
 953
 954         return 0;
 955 }
 956
 957 static int parse_compress_type(char *s)
 958 {
 959         if (strcmp(optarg, "zlib") == 0)
 960                 return BTRFS_COMPRESS_ZLIB;
 961         else if (strcmp(optarg, "lzo") == 0)
 962                 return BTRFS_COMPRESS_LZO;
 963         else {
 964                 fprintf(stderr, "Unknown compress type %s\n", s);
 965                 exit(1);
 966         };
 967 }
 968
 969 static const char * const cmd_filesystem_defrag_usage[] = {
 970         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
 971         "Defragment a file or a directory",
 972         "",
 973         "-v             be verbose",
 974         "-r             defragment files recursively",
 975         "-c[zlib,lzo]   compress the file while defragmenting",
 976         "-f             flush data to disk immediately after defragmenting",
 977         "-s start       defragment only from byte onward",
 978         "-l len         defragment only up to len bytes",
 979         "-t size        target extent size hint",
 980         NULL
 981 };
 982
 983 static int do_defrag(int fd, int fancy_ioctl,
 984                 struct btrfs_ioctl_defrag_range_args *range)
 985 {
 986         int ret;
 987
 988         if (!fancy_ioctl)
 989                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
 990         else
 991                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
 992
 993         return ret;
 994 }
 995
 996 static int defrag_global_fancy_ioctl;
 997 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
 998 static int defrag_global_verbose;
 999 static int defrag_global_errors;
1000 static int defrag_callback(const char *fpath, const struct stat *sb,
1001                 int typeflag, struct FTW *ftwbuf)
1002 {
1003         int ret = 0;
1004         int e = 0;
1005         int fd = 0;
1006
1007         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
1008                 if (defrag_global_verbose)
1009                         printf("%s\n", fpath);
1010                 fd = open(fpath, O_RDWR);
1011                 e = errno;
1012                 if (fd < 0)
1013                         goto error;
1014                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1015                 e = errno;
1016                 close(fd);
1017                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1018                         fprintf(stderr, "ERROR: defrag range ioctl not "
1019                                 "supported in this kernel, please try "
1020                                 "without any options.\n");
1021                         defrag_global_errors++;
1022                         return ENOTTY;
1023                 }
1024                 if (ret)
1025                         goto error;
1026         }
1027         return 0;
1028
1029 error:
1030         fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
1031         defrag_global_errors++;
1032         return 0;
1033 }
1034
1035 static int cmd_filesystem_defrag(int argc, char **argv)
1036 {
1037         int fd;
1038         int flush = 0;
1039         u64 start = 0;
1040         u64 len = (u64)-1;
1041         u64 thresh = 0;
1042         int i;
1043         int recursive = 0;
1044         int ret = 0;
1045         int e = 0;
1046         int compress_type = BTRFS_COMPRESS_NONE;
1047         DIR *dirstream;
1048
1049         defrag_global_errors = 0;
1050         defrag_global_verbose = 0;
1051         defrag_global_errors = 0;
1052         defrag_global_fancy_ioctl = 0;
1053         optind = 1;
1054         while(1) {
1055                 int c = getopt(argc, argv, "vrc::fs:l:t:");
1056                 if (c < 0)
1057                         break;
1058
1059                 switch(c) {
1060                 case 'c':
1061                         compress_type = BTRFS_COMPRESS_ZLIB;
1062                         if (optarg)
1063                                 compress_type = parse_compress_type(optarg);
1064                         defrag_global_fancy_ioctl = 1;
1065                         break;
1066                 case 'f':
1067                         flush = 1;
1068                         defrag_global_fancy_ioctl = 1;
1069                         break;
1070                 case 'v':
1071                         defrag_global_verbose = 1;
1072                         break;
1073                 case 's':
1074                         start = parse_size(optarg);
1075                         defrag_global_fancy_ioctl = 1;
1076                         break;
1077                 case 'l':
1078                         len = parse_size(optarg);
1079                         defrag_global_fancy_ioctl = 1;
1080                         break;
1081                 case 't':
1082                         thresh = parse_size(optarg);
1083                         if (thresh > (u32)-1) {
1084                                 fprintf(stderr,
1085                         "WARNING: target extent size %llu too big, trimmed to %u\n",
1086                                         thresh, (u32)-1);
1087                                 thresh = (u32)-1;
1088                         }
1089                         defrag_global_fancy_ioctl = 1;
1090                         break;
1091                 case 'r':
1092                         recursive = 1;
1093                         break;
1094                 default:
1095                         usage(cmd_filesystem_defrag_usage);
1096                 }
1097         }
1098
1099         if (check_argc_min(argc - optind, 1))
1100                 usage(cmd_filesystem_defrag_usage);
1101
1102         memset(&defrag_global_range, 0, sizeof(defrag_global_range));
1103         defrag_global_range.start = start;
1104         defrag_global_range.len = len;
1105         defrag_global_range.extent_thresh = (u32)thresh;
1106         if (compress_type) {
1107                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1108                 defrag_global_range.compress_type = compress_type;
1109         }
1110         if (flush)
1111                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1112
1113         for (i = optind; i < argc; i++) {
1114                 struct stat st;
1115
1116                 dirstream = NULL;
1117                 fd = open_file_or_dir(argv[i], &dirstream);
1118                 if (fd < 0) {
1119                         fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
1120                                         strerror(errno));
1121                         defrag_global_errors++;
1122                         close_file_or_dir(fd, dirstream);
1123                         continue;
1124                 }
1125                 if (fstat(fd, &st)) {
1126                         fprintf(stderr, "ERROR: failed to stat %s - %s\n",
1127                                         argv[i], strerror(errno));
1128                         defrag_global_errors++;
1129                         close_file_or_dir(fd, dirstream);
1130                         continue;
1131                 }
1132                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1133                         fprintf(stderr,
1134                             "ERROR: %s is not a directory or a regular file\n",
1135                             argv[i]);
1136                         defrag_global_errors++;
1137                         close_file_or_dir(fd, dirstream);
1138                         continue;
1139                 }
1140                 if (recursive) {
1141                         if (S_ISDIR(st.st_mode)) {
1142                                 ret = nftw(argv[i], defrag_callback, 10,
1143                                                 FTW_MOUNT | FTW_PHYS);
1144                                 if (ret == ENOTTY)
1145                                         exit(1);
1146                                 /* errors are handled in the callback */
1147                                 ret = 0;
1148                         } else {
1149                                 if (defrag_global_verbose)
1150                                         printf("%s\n", argv[i]);
1151                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1152                                                 &defrag_global_range);
1153                                 e = errno;
1154                         }
1155                 } else {
1156                         if (defrag_global_verbose)
1157                                 printf("%s\n", argv[i]);
1158                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
1159                                         &defrag_global_range);
1160                         e = errno;
1161                 }
1162                 close_file_or_dir(fd, dirstream);
1163                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1164                         fprintf(stderr, "ERROR: defrag range ioctl not "
1165                                 "supported in this kernel, please try "
1166                                 "without any options.\n");
1167                         defrag_global_errors++;
1168                         break;
1169                 }
1170                 if (ret) {
1171                         fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
1172                                 argv[i], strerror(e));
1173                         defrag_global_errors++;
1174                 }
1175         }
1176         if (defrag_global_verbose)
1177                 printf("%s\n", PACKAGE_STRING);
1178         if (defrag_global_errors)
1179                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1180
1181         return !!defrag_global_errors;
1182 }
1183
1184 static const char * const cmd_filesystem_resize_usage[] = {
1185         "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1186         "Resize a filesystem",
1187         "If 'max' is passed, the filesystem will occupy all available space",
1188         "on the device 'devid'.",
1189         "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1190         NULL
1191 };
1192
1193 static int cmd_filesystem_resize(int argc, char **argv)
1194 {
1195         struct btrfs_ioctl_vol_args     args;
1196         int     fd, res, len, e;
1197         char    *amount, *path;
1198         DIR     *dirstream = NULL;
1199         struct stat st;
1200
1201         if (check_argc_exact(argc, 3))
1202                 usage(cmd_filesystem_resize_usage);
1203
1204         amount = argv[1];
1205         path = argv[2];
1206
1207         len = strlen(amount);
1208         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1209                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
1210                         amount);
1211                 return 1;
1212         }
1213
1214         res = stat(path, &st);
1215         if (res < 0) {
1216                 fprintf(stderr, "ERROR: resize: cannot stat %s: %s\n",
1217                                 path, strerror(errno));
1218                 return 1;
1219         }
1220         if (!S_ISDIR(st.st_mode)) {
1221                 fprintf(stderr,
1222                         "ERROR: resize works on mounted filesystems and accepts only\n"
1223                         "directories as argument. Passing file containing a btrfs image\n"
1224                         "would resize the underlying filesystem instead of the image.\n");
1225                 return 1;
1226         }
1227
1228         fd = open_file_or_dir(path, &dirstream);
1229         if (fd < 0) {
1230                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1231                 return 1;
1232         }
1233
1234         printf("Resize '%s' of '%s'\n", path, amount);
1235         memset(&args, 0, sizeof(args));
1236         strncpy_null(args.name, amount);
1237         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1238         e = errno;
1239         close_file_or_dir(fd, dirstream);
1240         if( res < 0 ){
1241                 switch (e) {
1242                 case EFBIG:
1243                         fprintf(stderr, "ERROR: unable to resize '%s' - no enouth free space\n",
1244                                 path);
1245                         break;
1246                 default:
1247                         fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
1248                                 path, strerror(e));
1249                         break;
1250                 }
1251                 return 1;
1252         } else if (res > 0) {
1253                 const char *err_str = btrfs_err_str(res);
1254
1255                 if (err_str) {
1256                         fprintf(stderr, "ERROR: btrfs error resizing '%s' - %s\n",
1257                                 path, err_str);
1258                 } else {
1259                         fprintf(stderr,
1260                         "ERROR: btrfs error resizing '%s' - unknown btrfs_err_code %d\n",
1261                                 path, res);
1262                 }
1263                 return 1;
1264         }
1265         return 0;
1266 }
1267
1268 static const char * const cmd_filesystem_label_usage[] = {
1269         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1270         "Get or change the label of a filesystem",
1271         "With one argument, get the label of filesystem on <device>.",
1272         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1273         NULL
1274 };
1275
1276 static int cmd_filesystem_label(int argc, char **argv)
1277 {
1278         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
1279                 usage(cmd_filesystem_label_usage);
1280
1281         if (argc > 2) {
1282                 return set_label(argv[1], argv[2]);
1283         } else {
1284                 char label[BTRFS_LABEL_SIZE];
1285                 int ret;
1286
1287                 ret = get_label(argv[1], label);
1288                 if (!ret)
1289                         fprintf(stdout, "%s\n", label);
1290
1291                 return ret;
1292         }
1293 }
1294
1295 static const char filesystem_cmd_group_info[] =
1296 "overall filesystem tasks and information";
1297
1298 const struct cmd_group filesystem_cmd_group = {
1299         filesystem_cmd_group_usage, filesystem_cmd_group_info, {
1300                 { "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
1301                 { "show", cmd_filesystem_show, cmd_filesystem_show_usage, NULL,
1302                         0 },
1303                 { "sync", cmd_filesystem_sync, cmd_filesystem_sync_usage, NULL,
1304                         0 },
1305                 { "defragment", cmd_filesystem_defrag,
1306                         cmd_filesystem_defrag_usage, NULL, 0 },
1307                 { "balance", cmd_balance, NULL, &balance_cmd_group,
1308                         CMD_HIDDEN },
1309                 { "resize", cmd_filesystem_resize, cmd_filesystem_resize_usage,
1310                         NULL, 0 },
1311                 { "label", cmd_filesystem_label, cmd_filesystem_label_usage,
1312                         NULL, 0 },
1313                 { "usage", cmd_filesystem_usage,
1314                         cmd_filesystem_usage_usage, NULL, 0 },
1315
1316                 NULL_CMD_STRUCT
1317         }
1318 };
1319
1320 int cmd_filesystem(int argc, char **argv)
1321 {
1322         return handle_command_group(&filesystem_cmd_group, argc, argv);
1323 }