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         "-b|--raw           raw numbers in bytes",
 127         "-h|--human-readable",
 128         "                   human friendly numbers, base 1024 (default)",
 129         "-H                 human friendly numbers, base 1000",
 130         "--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",
 131         "--si               use 1000 as a base (kB, MB, GB, TB)",
 132         "-k|--kbytes        show sizes in KiB, or kB with --si",
 133         "-m|--mbytes        show sizes in MiB, or MB with --si",
 134         "-g|--gbytes        show sizes in GiB, or GB with --si",
 135         "-t|--tbytes        show sizes in TiB, or TB with --si",
 136        NULL
 137 };
 138
 139 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 140 {
 141         u64 count = 0;
 142         int ret, e;
 143         struct btrfs_ioctl_space_args *sargs;
 144
 145         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 146         if (!sargs)
 147                 return -ENOMEM;
 148
 149         sargs->space_slots = 0;
 150         sargs->total_spaces = 0;
 151
 152         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 153         e = errno;
 154         if (ret) {
 155                 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
 156                         strerror(e));
 157                 free(sargs);
 158                 return -e;
 159         }
 160         /* This really should never happen */
 161         if (!sargs->total_spaces) {
 162                 free(sargs);
 163                 return -ENOENT;
 164         }
 165         count = sargs->total_spaces;
 166         free(sargs);
 167
 168         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 169                         (count * sizeof(struct btrfs_ioctl_space_info)));
 170         if (!sargs)
 171                 return -ENOMEM;
 172
 173         sargs->space_slots = count;
 174         sargs->total_spaces = 0;
 175         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 176         e = errno;
 177         if (ret) {
 178                 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
 179                                 count, strerror(e));
 180                 free(sargs);
 181                 return -e;
 182         }
 183         *sargs_ret = sargs;
 184         return 0;
 185 }
 186
 187 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
 188 {
 189         u64 i;
 190         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 191
 192         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 193                 printf("%s, %s: total=%s, used=%s\n",
 194                         btrfs_group_type_str(sp->flags),
 195                         btrfs_group_profile_str(sp->flags),
 196                         pretty_size_mode(sp->total_bytes, unit_mode),
 197                         pretty_size_mode(sp->used_bytes, unit_mode));
 198         }
 199 }
 200
 201 static int cmd_filesystem_df(int argc, char **argv)
 202 {
 203         struct btrfs_ioctl_space_args *sargs = NULL;
 204         int ret;
 205         int fd;
 206         char *path;
 207         DIR *dirstream = NULL;
 208         unsigned unit_mode = UNITS_DEFAULT;
 209
 210         while (1) {
 211                 int c;
 212                 static const struct option long_options[] = {
 213                         { "raw", no_argument, NULL, 'b'},
 214                         { "kbytes", no_argument, NULL, 'k'},
 215                         { "mbytes", no_argument, NULL, 'm'},
 216                         { "gbytes", no_argument, NULL, 'g'},
 217                         { "tbytes", no_argument, NULL, 't'},
 218                         { "si", no_argument, NULL, GETOPT_VAL_SI},
 219                         { "iec", no_argument, NULL, GETOPT_VAL_IEC},
 220                         { "human-readable", no_argument, NULL,
 221                                 GETOPT_VAL_HUMAN_READABLE},
 222                         { NULL, 0, NULL, 0 }
 223                 };
 224
 225                 c = getopt_long(argc, argv, "bhHkmgt", long_options, NULL);
 226                 if (c < 0)
 227                         break;
 228                 switch (c) {
 229                 case 'b':
 230                         unit_mode = UNITS_RAW;
 231                         break;
 232                 case 'k':
 233                         units_set_base(&unit_mode, UNITS_KBYTES);
 234                         break;
 235                 case 'm':
 236                         units_set_base(&unit_mode, UNITS_MBYTES);
 237                         break;
 238                 case 'g':
 239                         units_set_base(&unit_mode, UNITS_GBYTES);
 240                         break;
 241                 case 't':
 242                         units_set_base(&unit_mode, UNITS_TBYTES);
 243                         break;
 244                 case GETOPT_VAL_HUMAN_READABLE:
 245                 case 'h':
 246                         unit_mode = UNITS_HUMAN_BINARY;
 247                         break;
 248                 case 'H':
 249                         unit_mode = UNITS_HUMAN_DECIMAL;
 250                         break;
 251                 case GETOPT_VAL_SI:
 252                         units_set_mode(&unit_mode, UNITS_DECIMAL);
 253                         break;
 254                 case GETOPT_VAL_IEC:
 255                         units_set_mode(&unit_mode, UNITS_BINARY);
 256                         break;
 257                 default:
 258                         usage(cmd_filesystem_df_usage);
 259                 }
 260         }
 261
 262         if (check_argc_exact(argc, optind + 1))
 263                 usage(cmd_filesystem_df_usage);
 264
 265         path = argv[optind];
 266
 267         fd = open_file_or_dir(path, &dirstream);
 268         if (fd < 0) {
 269                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 270                 return 1;
 271         }
 272         ret = get_df(fd, &sargs);
 273
 274         if (ret == 0) {
 275                 print_df(sargs, unit_mode);
 276                 free(sargs);
 277         } else {
 278                 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
 279         }
 280
 281         close_file_or_dir(fd, dirstream);
 282         return !!ret;
 283 }
 284
 285 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
 286                                         char *search)
 287 {
 288         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 289         int search_len = strlen(search);
 290
 291         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 292         uuid_unparse(fsid, uuidbuf);
 293         if (!strncmp(uuidbuf, search, search_len))
 294                 return 1;
 295
 296         if (strlen(label) && strcmp(label, search) == 0)
 297                 return 1;
 298
 299         if (strcmp(mnt, search) == 0)
 300                 return 1;
 301
 302         return 0;
 303 }
 304
 305 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 306 {
 307         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 308         struct list_head *cur;
 309         struct btrfs_device *device;
 310         int search_len = strlen(search);
 311
 312         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 313         uuid_unparse(fs_devices->fsid, uuidbuf);
 314         if (!strncmp(uuidbuf, search, search_len))
 315                 return 1;
 316
 317         list_for_each(cur, &fs_devices->devices) {
 318                 device = list_entry(cur, struct btrfs_device, dev_list);
 319                 if ((device->label && strcmp(device->label, search) == 0) ||
 320                     strcmp(device->name, search) == 0)
 321                         return 1;
 322         }
 323         return 0;
 324 }
 325
 326 /*
 327  * Sort devices by devid, ascending
 328  */
 329 static int cmp_device_id(void *priv, struct list_head *a,
 330                 struct list_head *b)
 331 {
 332         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 333                         dev_list);
 334         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 335                         dev_list);
 336
 337         return da->devid < db->devid ? -1 :
 338                 da->devid > db->devid ? 1 : 0;
 339 }
 340
 341 static void splice_device_list(struct list_head *seed_devices,
 342                                struct list_head *all_devices)
 343 {
 344         struct btrfs_device *in_all, *next_all;
 345         struct btrfs_device *in_seed, *next_seed;
 346
 347         list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
 348                 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
 349                                                                 dev_list) {
 350                         if (in_all->devid == in_seed->devid) {
 351                                 /*
 352                                  * When do dev replace in a sprout fs
 353                                  * to a dev in its seed fs, the replacing
 354                                  * dev will reside in the sprout fs and
 355                                  * the replaced dev will still exist
 356                                  * in the seed fs.
 357                                  * So pick the latest one when showing
 358                                  * the sprout fs.
 359                                  */
 360                                 if (in_all->generation
 361                                                 < in_seed->generation) {
 362                                         list_del(&in_all->dev_list);
 363                                         free(in_all);
 364                                 } else if (in_all->generation
 365                                                 > in_seed->generation) {
 366                                         list_del(&in_seed->dev_list);
 367                                         free(in_seed);
 368                                 }
 369                                 break;
 370                         }
 371                 }
 372         }
 373
 374         list_splice(seed_devices, all_devices);
 375 }
 376
 377 static void print_devices(struct btrfs_fs_devices *fs_devices,
 378                           u64 *devs_found)
 379 {
 380         struct btrfs_device *device;
 381         struct btrfs_fs_devices *cur_fs;
 382         struct list_head *all_devices;
 383
 384         all_devices = &fs_devices->devices;
 385         cur_fs = fs_devices->seed;
 386         /* add all devices of seed fs to the fs to be printed */
 387         while (cur_fs) {
 388                 splice_device_list(&cur_fs->devices, all_devices);
 389                 cur_fs = cur_fs->seed;
 390         }
 391
 392         list_sort(NULL, all_devices, cmp_device_id);
 393         list_for_each_entry(device, all_devices, dev_list) {
 394                 printf("\tdevid %4llu size %s used %s path %s\n",
 395                        (unsigned long long)device->devid,
 396                        pretty_size(device->total_bytes),
 397                        pretty_size(device->bytes_used), device->name);
 398
 399                 (*devs_found)++;
 400         }
 401 }
 402
 403 static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 404 {
 405         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 406         struct btrfs_device *device;
 407         u64 devs_found = 0;
 408         u64 total;
 409
 410         if (add_seen_fsid(fs_devices->fsid))
 411                 return;
 412
 413         uuid_unparse(fs_devices->fsid, uuidbuf);
 414         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 415                             dev_list);
 416         if (device->label && device->label[0])
 417                 printf("Label: '%s' ", device->label);
 418         else
 419                 printf("Label: none ");
 420
 421         total = device->total_devs;
 422         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 423                (unsigned long long)total,
 424                pretty_size(device->super_bytes_used));
 425
 426         print_devices(fs_devices, &devs_found);
 427
 428         if (devs_found < total) {
 429                 printf("\t*** Some devices missing\n");
 430         }
 431         printf("\n");
 432 }
 433
 434 /* adds up all the used spaces as reported by the space info ioctl
 435  */
 436 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 437 {
 438         u64 ret = 0;
 439         int i;
 440         for (i = 0; i < si->total_spaces; i++)
 441                 ret += si->spaces[i].used_bytes;
 442         return ret;
 443 }
 444
 445 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 446                 struct btrfs_ioctl_dev_info_args *dev_info,
 447                 struct btrfs_ioctl_space_args *space_info,
 448                 char *label, char *path)
 449 {
 450         int i;
 451         int fd;
 452         int missing = 0;
 453         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 454         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 455         int ret;
 456
 457         ret = add_seen_fsid(fs_info->fsid);
 458         if (ret == -EEXIST)
 459                 return 0;
 460         else if (ret)
 461                 return ret;
 462
 463         uuid_unparse(fs_info->fsid, uuidbuf);
 464         if (label && strlen(label))
 465                 printf("Label: '%s' ", label);
 466         else
 467                 printf("Label: none ");
 468
 469         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 470                         fs_info->num_devices,
 471                         pretty_size(calc_used_bytes(space_info)));
 472
 473         for (i = 0; i < fs_info->num_devices; i++) {
 474                 char *canonical_path;
 475
 476                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 477
 478                 /* Add check for missing devices even mounted */
 479                 fd = open((char *)tmp_dev_info->path, O_RDONLY);
 480                 if (fd < 0) {
 481                         missing = 1;
 482                         continue;
 483                 }
 484                 close(fd);
 485                 canonical_path = canonicalize_path((char *)tmp_dev_info->path);
 486                 printf("\tdevid %4llu size %s used %s path %s\n",
 487                         tmp_dev_info->devid,
 488                         pretty_size(tmp_dev_info->total_bytes),
 489                         pretty_size(tmp_dev_info->bytes_used),
 490                         canonical_path);
 491
 492                 free(canonical_path);
 493         }
 494
 495         if (missing)
 496                 printf("\t*** Some devices missing\n");
 497         printf("\n");
 498         return 0;
 499 }
 500
 501 static int btrfs_scan_kernel(void *search)
 502 {
 503         int ret = 0, fd;
 504         int found = 0;
 505         FILE *f;
 506         struct mntent *mnt;
 507         struct btrfs_ioctl_fs_info_args fs_info_arg;
 508         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 509         struct btrfs_ioctl_space_args *space_info_arg = NULL;
 510         char label[BTRFS_LABEL_SIZE];
 511
 512         f = setmntent("/proc/self/mounts", "r");
 513         if (f == NULL)
 514                 return 1;
 515
 516         memset(label, 0, sizeof(label));
 517         while ((mnt = getmntent(f)) != NULL) {
 518                 if (strcmp(mnt->mnt_type, "btrfs"))
 519                         continue;
 520                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 521                                 &dev_info_arg);
 522                 if (ret) {
 523                         kfree(dev_info_arg);
 524                         goto out;
 525                 }
 526
 527                 if (get_label_mounted(mnt->mnt_dir, label)) {
 528                         kfree(dev_info_arg);
 529                         goto out;
 530                 }
 531                 if (search && !match_search_item_kernel(fs_info_arg.fsid,
 532                                         mnt->mnt_dir, label, search)) {
 533                         kfree(dev_info_arg);
 534                         continue;
 535                 }
 536
 537                 fd = open(mnt->mnt_dir, O_RDONLY);
 538                 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
 539                         print_one_fs(&fs_info_arg, dev_info_arg,
 540                                         space_info_arg, label, mnt->mnt_dir);
 541                         kfree(space_info_arg);
 542                         memset(label, 0, sizeof(label));
 543                         found = 1;
 544                 }
 545                 if (fd != -1)
 546                         close(fd);
 547                 kfree(dev_info_arg);
 548         }
 549
 550 out:
 551         endmntent(f);
 552         return !found;
 553 }
 554
 555 static int dev_to_fsid(char *dev, __u8 *fsid)
 556 {
 557         struct btrfs_super_block *disk_super;
 558         char *buf;
 559         int ret;
 560         int fd;
 561
 562         buf = malloc(4096);
 563         if (!buf)
 564                 return -ENOMEM;
 565
 566         fd = open(dev, O_RDONLY);
 567         if (fd < 0) {
 568                 ret = -errno;
 569                 free(buf);
 570                 return ret;
 571         }
 572
 573         disk_super = (struct btrfs_super_block *)buf;
 574         ret = btrfs_read_dev_super(fd, disk_super,
 575                                    BTRFS_SUPER_INFO_OFFSET, 0);
 576         if (ret)
 577                 goto out;
 578
 579         memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 580         ret = 0;
 581
 582 out:
 583         close(fd);
 584         free(buf);
 585         return ret;
 586 }
 587
 588 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 589 {
 590         struct btrfs_fs_devices *cur_seed, *next_seed;
 591         struct btrfs_device *device;
 592
 593         while (!list_empty(&fs_devices->devices)) {
 594                 device = list_entry(fs_devices->devices.next,
 595                                         struct btrfs_device, dev_list);
 596                 list_del(&device->dev_list);
 597
 598                 free(device->name);
 599                 free(device->label);
 600                 free(device);
 601         }
 602
 603         /* free seed fs chain */
 604         cur_seed = fs_devices->seed;
 605         fs_devices->seed = NULL;
 606         while (cur_seed) {
 607                 next_seed = cur_seed->seed;
 608                 free(cur_seed);
 609
 610                 cur_seed = next_seed;
 611         }
 612
 613         list_del(&fs_devices->list);
 614         free(fs_devices);
 615 }
 616
 617 static int copy_device(struct btrfs_device *dst,
 618                        struct btrfs_device *src)
 619 {
 620         dst->devid = src->devid;
 621         memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
 622         if (src->name == NULL)
 623                 dst->name = NULL;
 624         else {
 625                 dst->name = strdup(src->name);
 626                 if (!dst->name)
 627                         return -ENOMEM;
 628         }
 629         if (src->label == NULL)
 630                 dst->label = NULL;
 631         else {
 632                 dst->label = strdup(src->label);
 633                 if (!dst->label) {
 634                         free(dst->name);
 635                         return -ENOMEM;
 636                 }
 637         }
 638         dst->total_devs = src->total_devs;
 639         dst->super_bytes_used = src->super_bytes_used;
 640         dst->total_bytes = src->total_bytes;
 641         dst->bytes_used = src->bytes_used;
 642         dst->generation = src->generation;
 643
 644         return 0;
 645 }
 646
 647 static int copy_fs_devices(struct btrfs_fs_devices *dst,
 648                            struct btrfs_fs_devices *src)
 649 {
 650         struct btrfs_device *cur_dev, *dev_copy;
 651         int ret = 0;
 652
 653         memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
 654         INIT_LIST_HEAD(&dst->devices);
 655         dst->seed = NULL;
 656
 657         list_for_each_entry(cur_dev, &src->devices, dev_list) {
 658                 dev_copy = malloc(sizeof(*dev_copy));
 659                 if (!dev_copy) {
 660                         ret = -ENOMEM;
 661                         break;
 662                 }
 663
 664                 ret = copy_device(dev_copy, cur_dev);
 665                 if (ret) {
 666                         free(dev_copy);
 667                         break;
 668                 }
 669
 670                 list_add(&dev_copy->dev_list, &dst->devices);
 671                 dev_copy->fs_devices = dst;
 672         }
 673
 674         return ret;
 675 }
 676
 677 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
 678                               struct btrfs_fs_devices *copy,
 679                               struct list_head *fs_uuids) {
 680         struct btrfs_fs_devices *cur_fs;
 681
 682         list_for_each_entry(cur_fs, fs_uuids, list)
 683                 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
 684                         return copy_fs_devices(copy, cur_fs);
 685
 686         return 1;
 687 }
 688
 689 static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
 690 {
 691         struct btrfs_device *device;
 692         int dev_cnt_total, dev_cnt = 0;
 693
 694         device = list_first_entry(&fs_devices->devices, struct btrfs_device,
 695                                   dev_list);
 696
 697         dev_cnt_total = device->total_devs;
 698
 699         list_for_each_entry(device, &fs_devices->devices, dev_list)
 700                 dev_cnt++;
 701
 702         return dev_cnt_total != dev_cnt;
 703 }
 704
 705 static int search_umounted_fs_uuids(struct list_head *all_uuids,
 706                                     char *search, int *found)
 707 {
 708         struct btrfs_fs_devices *cur_fs, *fs_copy;
 709         struct list_head *fs_uuids;
 710         int ret = 0;
 711
 712         fs_uuids = btrfs_scanned_uuids();
 713
 714         /*
 715          * The fs_uuids list is global, and open_ctree_* will
 716          * modify it, make a private copy here
 717          */
 718         list_for_each_entry(cur_fs, fs_uuids, list) {
 719                 /* don't bother handle all fs, if search target specified */
 720                 if (search) {
 721                         if (uuid_search(cur_fs, search) == 0)
 722                                 continue;
 723                         if (found)
 724                                 *found = 1;
 725                 }
 726
 727                 /* skip all fs already shown as mounted fs */
 728                 if (is_seen_fsid(cur_fs->fsid))
 729                         continue;
 730
 731                 fs_copy = malloc(sizeof(*fs_copy));
 732                 if (!fs_copy) {
 733                         ret = -ENOMEM;
 734                         goto out;
 735                 }
 736
 737                 ret = copy_fs_devices(fs_copy, cur_fs);
 738                 if (ret) {
 739                         free(fs_copy);
 740                         goto out;
 741                 }
 742
 743                 list_add(&fs_copy->list, all_uuids);
 744         }
 745
 746 out:
 747         return ret;
 748 }
 749
 750 static int map_seed_devices(struct list_head *all_uuids)
 751 {
 752         struct btrfs_fs_devices *cur_fs, *cur_seed;
 753         struct btrfs_fs_devices *seed_copy;
 754         struct btrfs_fs_devices *opened_fs;
 755         struct btrfs_device *device;
 756         struct btrfs_fs_info *fs_info;
 757         struct list_head *fs_uuids;
 758         int ret = 0;
 759
 760         fs_uuids = btrfs_scanned_uuids();
 761
 762         list_for_each_entry(cur_fs, all_uuids, list) {
 763                 device = list_first_entry(&cur_fs->devices,
 764                                                 struct btrfs_device, dev_list);
 765                 if (!device)
 766                         continue;
 767
 768                 /* skip fs without seeds */
 769                 if (!has_seed_devices(cur_fs))
 770                         continue;
 771
 772                 /*
 773                  * open_ctree_* detects seed/sprout mapping
 774                  */
 775                 fs_info = open_ctree_fs_info(device->name, 0, 0,
 776                                                 OPEN_CTREE_PARTIAL);
 777                 if (!fs_info)
 778                         continue;
 779
 780                 /*
 781                  * copy the seed chain under the opened fs
 782                  */
 783                 opened_fs = fs_info->fs_devices;
 784                 cur_seed = cur_fs;
 785                 while (opened_fs->seed) {
 786                         seed_copy = malloc(sizeof(*seed_copy));
 787                         if (!seed_copy) {
 788                                 ret = -ENOMEM;
 789                                 goto fail_out;
 790                         }
 791                         ret = find_and_copy_seed(opened_fs->seed, seed_copy,
 792                                                  fs_uuids);
 793                         if (ret) {
 794                                 free(seed_copy);
 795                                 goto fail_out;
 796                         }
 797
 798                         cur_seed->seed = seed_copy;
 799
 800                         opened_fs = opened_fs->seed;
 801                         cur_seed = cur_seed->seed;
 802                 }
 803
 804                 close_ctree(fs_info->chunk_root);
 805         }
 806
 807 out:
 808         return ret;
 809 fail_out:
 810         close_ctree(fs_info->chunk_root);
 811         goto out;
 812 }
 813
 814 static const char * const cmd_show_usage[] = {
 815         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 816         "Show the structure of a filesystem",
 817         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 818         "-m|--mounted       show only mounted btrfs",
 819         "If no argument is given, structure of all present filesystems is shown.",
 820         NULL
 821 };
 822
 823 static int cmd_show(int argc, char **argv)
 824 {
 825         LIST_HEAD(all_uuids);
 826         struct btrfs_fs_devices *fs_devices;
 827         char *search = NULL;
 828         int ret;
 829         /* default, search both kernel and udev */
 830         int where = -1;
 831         int type = 0;
 832         char mp[BTRFS_PATH_NAME_MAX + 1];
 833         char path[PATH_MAX];
 834         __u8 fsid[BTRFS_FSID_SIZE];
 835         char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 836         int found = 0;
 837
 838         while (1) {
 839                 int c;
 840                 static const struct option long_options[] = {
 841                         { "all-devices", no_argument, NULL, 'd'},
 842                         { "mounted", no_argument, NULL, 'm'},
 843                         { NULL, 0, NULL, 0 }
 844                 };
 845
 846                 c = getopt_long(argc, argv, "dm", long_options, NULL);
 847                 if (c < 0)
 848                         break;
 849                 switch (c) {
 850                 case 'd':
 851                         where = BTRFS_SCAN_LBLKID;
 852                         break;
 853                 case 'm':
 854                         where = BTRFS_SCAN_MOUNTED;
 855                         break;
 856                 default:
 857                         usage(cmd_show_usage);
 858                 }
 859         }
 860
 861         if (check_argc_max(argc, optind + 1))
 862                 usage(cmd_show_usage);
 863
 864         if (argc > optind) {
 865                 search = argv[optind];
 866                 if (strlen(search) == 0)
 867                         usage(cmd_show_usage);
 868                 type = check_arg_type(search);
 869
 870                 /*
 871                  * For search is a device:
 872                  *     realpath do /dev/mapper/XX => /dev/dm-X
 873                  *     which is required by BTRFS_SCAN_DEV
 874                  * For search is a mountpoint:
 875                  *     realpath do  /mnt/btrfs/  => /mnt/btrfs
 876                  *     which shall be recognized by btrfs_scan_kernel()
 877                  */
 878                 if (realpath(search, path))
 879                         search = path;
 880
 881                 /*
 882                  * Needs special handling if input arg is block dev And if
 883                  * input arg is mount-point just print it right away
 884                  */
 885                 if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
 886                         ret = get_btrfs_mount(search, mp, sizeof(mp));
 887                         if (!ret) {
 888                                 /* given block dev is mounted */
 889                                 search = mp;
 890                                 type = BTRFS_ARG_MNTPOINT;
 891                         } else {
 892                                 ret = dev_to_fsid(search, fsid);
 893                                 if (ret) {
 894                                         fprintf(stderr,
 895                                                 "ERROR: No btrfs on %s\n",
 896                                                 search);
 897                                         return 1;
 898                                 }
 899                                 uuid_unparse(fsid, uuid_buf);
 900                                 search = uuid_buf;
 901                                 type = BTRFS_ARG_UUID;
 902                                 goto devs_only;
 903                         }
 904                 }
 905         }
 906
 907         if (where == BTRFS_SCAN_LBLKID)
 908                 goto devs_only;
 909
 910         /* show mounted btrfs */
 911         ret = btrfs_scan_kernel(search);
 912         if (search && !ret) {
 913                 /* since search is found we are done */
 914                 goto out;
 915         }
 916
 917         /* shows mounted only */
 918         if (where == BTRFS_SCAN_MOUNTED)
 919                 goto out;
 920
 921 devs_only:
 922         ret = btrfs_scan_lblkid();
 923
 924         if (ret) {
 925                 fprintf(stderr, "ERROR: %d while scanning\n", ret);
 926                 return 1;
 927         }
 928
 929         ret = search_umounted_fs_uuids(&all_uuids, search, &found);
 930         if (ret < 0) {
 931                 fprintf(stderr,
 932                         "ERROR: %d while searching target device\n", ret);
 933                 return 1;
 934         }
 935
 936         /*
 937          * The seed/sprout mapping are not detected yet,
 938          * do mapping build for all umounted fs
 939          */
 940         ret = map_seed_devices(&all_uuids);
 941         if (ret) {
 942                 fprintf(stderr,
 943                         "ERROR: %d while mapping seed devices\n", ret);
 944                 return 1;
 945         }
 946
 947         list_for_each_entry(fs_devices, &all_uuids, list)
 948                 print_one_uuid(fs_devices);
 949
 950         if (search && !found)
 951                 ret = 1;
 952
 953         while (!list_empty(&all_uuids)) {
 954                 fs_devices = list_entry(all_uuids.next,
 955                                         struct btrfs_fs_devices, list);
 956                 free_fs_devices(fs_devices);
 957         }
 958 out:
 959         printf("%s\n", PACKAGE_STRING);
 960         free_seen_fsid();
 961         return ret;
 962 }
 963
 964 static const char * const cmd_sync_usage[] = {
 965         "btrfs filesystem sync <path>",
 966         "Force a sync on a filesystem",
 967         NULL
 968 };
 969
 970 static int cmd_sync(int argc, char **argv)
 971 {
 972         int     fd, res, e;
 973         char    *path;
 974         DIR     *dirstream = NULL;
 975
 976         if (check_argc_exact(argc, 2))
 977                 usage(cmd_sync_usage);
 978
 979         path = argv[1];
 980
 981         fd = open_file_or_dir(path, &dirstream);
 982         if (fd < 0) {
 983                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 984                 return 1;
 985         }
 986
 987         printf("FSSync '%s'\n", path);
 988         res = ioctl(fd, BTRFS_IOC_SYNC);
 989         e = errno;
 990         close_file_or_dir(fd, dirstream);
 991         if( res < 0 ){
 992                 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
 993                         path, strerror(e));
 994                 return 1;
 995         }
 996
 997         return 0;
 998 }
 999
1000 static int parse_compress_type(char *s)
1001 {
1002         if (strcmp(optarg, "zlib") == 0)
1003                 return BTRFS_COMPRESS_ZLIB;
1004         else if (strcmp(optarg, "lzo") == 0)
1005                 return BTRFS_COMPRESS_LZO;
1006         else {
1007                 fprintf(stderr, "Unknown compress type %s\n", s);
1008                 exit(1);
1009         };
1010 }
1011
1012 static const char * const cmd_defrag_usage[] = {
1013         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
1014         "Defragment a file or a directory",
1015         "",
1016         "-v             be verbose",
1017         "-r             defragment files recursively",
1018         "-c[zlib,lzo]   compress the file while defragmenting",
1019         "-f             flush data to disk immediately after defragmenting",
1020         "-s start       defragment only from byte onward",
1021         "-l len         defragment only up to len bytes",
1022         "-t size        minimal size of file to be considered for defragmenting",
1023         NULL
1024 };
1025
1026 static int do_defrag(int fd, int fancy_ioctl,
1027                 struct btrfs_ioctl_defrag_range_args *range)
1028 {
1029         int ret;
1030
1031         if (!fancy_ioctl)
1032                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
1033         else
1034                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
1035
1036         return ret;
1037 }
1038
1039 static int defrag_global_fancy_ioctl;
1040 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
1041 static int defrag_global_verbose;
1042 static int defrag_global_errors;
1043 static int defrag_callback(const char *fpath, const struct stat *sb,
1044                 int typeflag, struct FTW *ftwbuf)
1045 {
1046         int ret = 0;
1047         int e = 0;
1048         int fd = 0;
1049
1050         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
1051                 if (defrag_global_verbose)
1052                         printf("%s\n", fpath);
1053                 fd = open(fpath, O_RDWR);
1054                 e = errno;
1055                 if (fd < 0)
1056                         goto error;
1057                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1058                 e = errno;
1059                 close(fd);
1060                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1061                         fprintf(stderr, "ERROR: defrag range ioctl not "
1062                                 "supported in this kernel, please try "
1063                                 "without any options.\n");
1064                         defrag_global_errors++;
1065                         return ENOTTY;
1066                 }
1067                 if (ret)
1068                         goto error;
1069         }
1070         return 0;
1071
1072 error:
1073         fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
1074         defrag_global_errors++;
1075         return 0;
1076 }
1077
1078 static int cmd_defrag(int argc, char **argv)
1079 {
1080         int fd;
1081         int flush = 0;
1082         u64 start = 0;
1083         u64 len = (u64)-1;
1084         u32 thresh = 0;
1085         int i;
1086         int recursive = 0;
1087         int ret = 0;
1088         struct btrfs_ioctl_defrag_range_args range;
1089         int e = 0;
1090         int compress_type = BTRFS_COMPRESS_NONE;
1091         DIR *dirstream;
1092
1093         defrag_global_errors = 0;
1094         defrag_global_verbose = 0;
1095         defrag_global_errors = 0;
1096         defrag_global_fancy_ioctl = 0;
1097         optind = 1;
1098         while(1) {
1099                 int c = getopt(argc, argv, "vrc::fs:l:t:");
1100                 if (c < 0)
1101                         break;
1102
1103                 switch(c) {
1104                 case 'c':
1105                         compress_type = BTRFS_COMPRESS_ZLIB;
1106                         if (optarg)
1107                                 compress_type = parse_compress_type(optarg);
1108                         defrag_global_fancy_ioctl = 1;
1109                         break;
1110                 case 'f':
1111                         flush = 1;
1112                         defrag_global_fancy_ioctl = 1;
1113                         break;
1114                 case 'v':
1115                         defrag_global_verbose = 1;
1116                         break;
1117                 case 's':
1118                         start = parse_size(optarg);
1119                         defrag_global_fancy_ioctl = 1;
1120                         break;
1121                 case 'l':
1122                         len = parse_size(optarg);
1123                         defrag_global_fancy_ioctl = 1;
1124                         break;
1125                 case 't':
1126                         thresh = parse_size(optarg);
1127                         defrag_global_fancy_ioctl = 1;
1128                         break;
1129                 case 'r':
1130                         recursive = 1;
1131                         break;
1132                 default:
1133                         usage(cmd_defrag_usage);
1134                 }
1135         }
1136
1137         if (check_argc_min(argc - optind, 1))
1138                 usage(cmd_defrag_usage);
1139
1140         memset(&defrag_global_range, 0, sizeof(range));
1141         defrag_global_range.start = start;
1142         defrag_global_range.len = len;
1143         defrag_global_range.extent_thresh = thresh;
1144         if (compress_type) {
1145                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1146                 defrag_global_range.compress_type = compress_type;
1147         }
1148         if (flush)
1149                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1150
1151         for (i = optind; i < argc; i++) {
1152                 struct stat st;
1153
1154                 dirstream = NULL;
1155                 fd = open_file_or_dir(argv[i], &dirstream);
1156                 if (fd < 0) {
1157                         fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
1158                                         strerror(errno));
1159                         defrag_global_errors++;
1160                         close_file_or_dir(fd, dirstream);
1161                         continue;
1162                 }
1163                 if (fstat(fd, &st)) {
1164                         fprintf(stderr, "ERROR: failed to stat %s - %s\n",
1165                                         argv[i], strerror(errno));
1166                         defrag_global_errors++;
1167                         close_file_or_dir(fd, dirstream);
1168                         continue;
1169                 }
1170                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1171                         fprintf(stderr,
1172                             "ERROR: %s is not a directory or a regular file\n",
1173                             argv[i]);
1174                         defrag_global_errors++;
1175                         close_file_or_dir(fd, dirstream);
1176                         continue;
1177                 }
1178                 if (recursive) {
1179                         if (S_ISDIR(st.st_mode)) {
1180                                 ret = nftw(argv[i], defrag_callback, 10,
1181                                                 FTW_MOUNT | FTW_PHYS);
1182                                 if (ret == ENOTTY)
1183                                         exit(1);
1184                                 /* errors are handled in the callback */
1185                                 ret = 0;
1186                         } else {
1187                                 if (defrag_global_verbose)
1188                                         printf("%s\n", argv[i]);
1189                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1190                                                 &defrag_global_range);
1191                                 e = errno;
1192                         }
1193                 } else {
1194                         if (defrag_global_verbose)
1195                                 printf("%s\n", argv[i]);
1196                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
1197                                         &defrag_global_range);
1198                         e = errno;
1199                 }
1200                 close_file_or_dir(fd, dirstream);
1201                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1202                         fprintf(stderr, "ERROR: defrag range ioctl not "
1203                                 "supported in this kernel, please try "
1204                                 "without any options.\n");
1205                         defrag_global_errors++;
1206                         break;
1207                 }
1208                 if (ret) {
1209                         fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
1210                                 argv[i], strerror(e));
1211                         defrag_global_errors++;
1212                 }
1213         }
1214         if (defrag_global_verbose)
1215                 printf("%s\n", PACKAGE_STRING);
1216         if (defrag_global_errors)
1217                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1218
1219         return !!defrag_global_errors;
1220 }
1221
1222 static const char * const cmd_resize_usage[] = {
1223         "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1224         "Resize a filesystem",
1225         "If 'max' is passed, the filesystem will occupy all available space",
1226         "on the device 'devid'.",
1227         "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1228         NULL
1229 };
1230
1231 static int cmd_resize(int argc, char **argv)
1232 {
1233         struct btrfs_ioctl_vol_args     args;
1234         int     fd, res, len, e;
1235         char    *amount, *path;
1236         DIR     *dirstream = NULL;
1237         struct stat st;
1238
1239         if (check_argc_exact(argc, 3))
1240                 usage(cmd_resize_usage);
1241
1242         amount = argv[1];
1243         path = argv[2];
1244
1245         len = strlen(amount);
1246         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1247                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
1248                         amount);
1249                 return 1;
1250         }
1251
1252         res = stat(path, &st);
1253         if (res < 0) {
1254                 fprintf(stderr, "ERROR: resize: cannot stat %s: %s\n",
1255                                 path, strerror(errno));
1256                 return 1;
1257         }
1258         if (!S_ISDIR(st.st_mode)) {
1259                 fprintf(stderr,
1260                         "ERROR: resize works on mounted filesystems and accepts only\n"
1261                         "directories as argument. Passing file containing a btrfs image\n"
1262                         "would resize the underlying filesystem instead of the image.\n");
1263                 return 1;
1264         }
1265
1266         fd = open_file_or_dir(path, &dirstream);
1267         if (fd < 0) {
1268                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1269                 return 1;
1270         }
1271
1272         printf("Resize '%s' of '%s'\n", path, amount);
1273         strncpy_null(args.name, amount);
1274         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1275         e = errno;
1276         close_file_or_dir(fd, dirstream);
1277         if( res < 0 ){
1278                 fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
1279                         path, strerror(e));
1280                 return 1;
1281         } else if (res > 0) {
1282                 const char *err_str = btrfs_err_str(res);
1283
1284                 if (err_str) {
1285                         fprintf(stderr, "ERROR: btrfs error resizing '%s' - %s\n",
1286                                 path, err_str);
1287                 } else {
1288                         fprintf(stderr,
1289                         "ERROR: btrfs error resizing '%s' - unknown btrfs_err_code %d\n",
1290                                 path, res);
1291                 }
1292                 return 1;
1293         }
1294         return 0;
1295 }
1296
1297 static const char * const cmd_label_usage[] = {
1298         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1299         "Get or change the label of a filesystem",
1300         "With one argument, get the label of filesystem on <device>.",
1301         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1302         NULL
1303 };
1304
1305 static int cmd_label(int argc, char **argv)
1306 {
1307         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
1308                 usage(cmd_label_usage);
1309
1310         if (argc > 2) {
1311                 return set_label(argv[1], argv[2]);
1312         } else {
1313                 char label[BTRFS_LABEL_SIZE];
1314                 int ret;
1315
1316                 ret = get_label(argv[1], label);
1317                 if (!ret)
1318                         fprintf(stdout, "%s\n", label);
1319
1320                 return ret;
1321         }
1322 }
1323
1324 static const char filesystem_cmd_group_info[] =
1325 "overall filesystem tasks and information";
1326
1327 const struct cmd_group filesystem_cmd_group = {
1328         filesystem_cmd_group_usage, filesystem_cmd_group_info, {
1329                 { "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
1330                 { "show", cmd_show, cmd_show_usage, NULL, 0 },
1331                 { "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
1332                 { "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
1333                 { "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
1334                 { "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
1335                 { "label", cmd_label, cmd_label_usage, NULL, 0 },
1336                 { "usage", cmd_filesystem_usage,
1337                         cmd_filesystem_usage_usage, NULL, 0 },
1338
1339                 NULL_CMD_STRUCT
1340         }
1341 };
1342
1343 int cmd_filesystem(int argc, char **argv)
1344 {
1345         return handle_command_group(&filesystem_cmd_group, argc, argv);
1346 }