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 #define _XOPEN_SOURCE 500
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <sys/ioctl.h>
  23 #include <errno.h>
  24 #include <uuid/uuid.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <ftw.h>
  28 #include <mntent.h>
  29 #include <linux/limits.h>
  30 #include <getopt.h>
  31
  32 #include "kerncompat.h"
  33 #include "ctree.h"
  34 #include "ioctl.h"
  35 #include "utils.h"
  36 #include "volumes.h"
  37 #include "version.h"
  38 #include "commands.h"
  39 #include "list_sort.h"
  40 #include "disk-io.h"
  41
  42
  43 /*
  44  * for btrfs fi show, we maintain a hash of fsids we've already printed.
  45  * This way we don't print dups if a given FS is mounted more than once.
  46  */
  47 #define SEEN_FSID_HASH_SIZE 256
  48
  49 struct seen_fsid {
  50         u8 fsid[BTRFS_FSID_SIZE];
  51         struct seen_fsid *next;
  52 };
  53
  54 static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
  55
  56 static int add_seen_fsid(u8 *fsid)
  57 {
  58         u8 hash = fsid[0];
  59         int slot = hash % SEEN_FSID_HASH_SIZE;
  60         struct seen_fsid *seen = seen_fsid_hash[slot];
  61         struct seen_fsid *alloc;
  62
  63         if (!seen)
  64                 goto insert;
  65
  66         while (1) {
  67                 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
  68                         return -EEXIST;
  69
  70                 if (!seen->next)
  71                         break;
  72
  73                 seen = seen->next;
  74         }
  75
  76 insert:
  77
  78         alloc = malloc(sizeof(*alloc));
  79         if (!alloc)
  80                 return -ENOMEM;
  81
  82         alloc->next = NULL;
  83         memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
  84
  85         if (seen)
  86                 seen->next = alloc;
  87         else
  88                 seen_fsid_hash[slot] = alloc;
  89
  90         return 0;
  91 }
  92
  93 static void free_seen_fsid(void)
  94 {
  95         int slot;
  96         struct seen_fsid *seen;
  97         struct seen_fsid *next;
  98
  99         for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
 100                 seen = seen_fsid_hash[slot];
 101                 while (seen) {
 102                         next = seen->next;
 103                         free(seen);
 104                         seen = next;
 105                 }
 106                 seen_fsid_hash[slot] = NULL;
 107         }
 108 }
 109
 110 static const char * const filesystem_cmd_group_usage[] = {
 111         "btrfs filesystem [<group>] <command> [<args>]",
 112         NULL
 113 };
 114
 115 static const char * const cmd_df_usage[] = {
 116        "btrfs filesystem df [options] <path>",
 117        "Show space usage information for a mount point",
 118         "-b|--raw           raw numbers in bytes",
 119         "-h                 human friendly numbers, base 1024 (default)",
 120         "-H                 human friendly numbers, base 1000",
 121         "--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",
 122         "--si               use 1000 as a base (kB, mB, gB, tB)",
 123         "-k|--kbytes        show sizes in KiB, or kB with --si",
 124         "-m|--mbytes        show sizes in MiB, or mB with --si",
 125         "-g|--gbytes        show sizes in GiB, or gB with --si",
 126         "-t|--tbytes        show sizes in TiB, or tB with --si",
 127        NULL
 128 };
 129
 130 static char *group_type_str(u64 flag)
 131 {
 132         u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
 133                 BTRFS_SPACE_INFO_GLOBAL_RSV;
 134
 135         switch (flag & mask) {
 136         case BTRFS_BLOCK_GROUP_DATA:
 137                 return "Data";
 138         case BTRFS_BLOCK_GROUP_SYSTEM:
 139                 return "System";
 140         case BTRFS_BLOCK_GROUP_METADATA:
 141                 return "Metadata";
 142         case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
 143                 return "Data+Metadata";
 144         case BTRFS_SPACE_INFO_GLOBAL_RSV:
 145                 return "GlobalReserve";
 146         default:
 147                 return "unknown";
 148         }
 149 }
 150
 151 static char *group_profile_str(u64 flag)
 152 {
 153         switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
 154         case 0:
 155                 return "single";
 156         case BTRFS_BLOCK_GROUP_RAID0:
 157                 return "RAID0";
 158         case BTRFS_BLOCK_GROUP_RAID1:
 159                 return "RAID1";
 160         case BTRFS_BLOCK_GROUP_RAID5:
 161                 return "RAID5";
 162         case BTRFS_BLOCK_GROUP_RAID6:
 163                 return "RAID6";
 164         case BTRFS_BLOCK_GROUP_DUP:
 165                 return "DUP";
 166         case BTRFS_BLOCK_GROUP_RAID10:
 167                 return "RAID10";
 168         default:
 169                 return "unknown";
 170         }
 171 }
 172
 173 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 174 {
 175         u64 count = 0;
 176         int ret, e;
 177         struct btrfs_ioctl_space_args *sargs;
 178
 179         sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
 180         if (!sargs)
 181                 return -ENOMEM;
 182
 183         sargs->space_slots = 0;
 184         sargs->total_spaces = 0;
 185
 186         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 187         e = errno;
 188         if (ret) {
 189                 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
 190                         strerror(e));
 191                 free(sargs);
 192                 return -e;
 193         }
 194         /* This really should never happen */
 195         if (!sargs->total_spaces) {
 196                 free(sargs);
 197                 return -ENOENT;
 198         }
 199         count = sargs->total_spaces;
 200         free(sargs);
 201
 202         sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 203                         (count * sizeof(struct btrfs_ioctl_space_info)));
 204         if (!sargs)
 205                 return -ENOMEM;
 206
 207         sargs->space_slots = count;
 208         sargs->total_spaces = 0;
 209         ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
 210         e = errno;
 211         if (ret) {
 212                 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
 213                                 count, strerror(e));
 214                 free(sargs);
 215                 return -e;
 216         }
 217         *sargs_ret = sargs;
 218         return 0;
 219 }
 220
 221 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
 222 {
 223         u64 i;
 224         struct btrfs_ioctl_space_info *sp = sargs->spaces;
 225
 226         for (i = 0; i < sargs->total_spaces; i++, sp++) {
 227                 printf("%s, %s: total=%s, used=%s\n",
 228                         group_type_str(sp->flags),
 229                         group_profile_str(sp->flags),
 230                         pretty_size_mode(sp->total_bytes, unit_mode),
 231                         pretty_size_mode(sp->used_bytes, unit_mode));
 232         }
 233 }
 234
 235 static int cmd_df(int argc, char **argv)
 236 {
 237         struct btrfs_ioctl_space_args *sargs = NULL;
 238         int ret;
 239         int fd;
 240         char *path;
 241         DIR *dirstream = NULL;
 242         unsigned unit_mode = UNITS_DEFAULT;
 243
 244         optind = 1;
 245         while (1) {
 246                 int long_index;
 247                 static const struct option long_options[] = {
 248                         { "raw", no_argument, NULL, 'b'},
 249                         { "kbytes", no_argument, NULL, 'k'},
 250                         { "mbytes", no_argument, NULL, 'm'},
 251                         { "gbytes", no_argument, NULL, 'g'},
 252                         { "tbytes", no_argument, NULL, 't'},
 253                         { "si", no_argument, NULL, 256},
 254                         { "iec", no_argument, NULL, 257},
 255                 };
 256                 int c = getopt_long(argc, argv, "bhHkmgt", long_options,
 257                                         &long_index);
 258                 if (c < 0)
 259                         break;
 260                 switch (c) {
 261                 case 'b':
 262                         unit_mode = UNITS_RAW;
 263                         break;
 264                 case 'k':
 265                         units_set_base(&unit_mode, UNITS_KBYTES);
 266                         break;
 267                 case 'm':
 268                         units_set_base(&unit_mode, UNITS_MBYTES);
 269                         break;
 270                 case 'g':
 271                         units_set_base(&unit_mode, UNITS_GBYTES);
 272                         break;
 273                 case 't':
 274                         units_set_base(&unit_mode, UNITS_TBYTES);
 275                         break;
 276                 case 'h':
 277                         unit_mode = UNITS_HUMAN_BINARY;
 278                         break;
 279                 case 'H':
 280                         unit_mode = UNITS_HUMAN_DECIMAL;
 281                         break;
 282                 case 256:
 283                         units_set_mode(&unit_mode, UNITS_DECIMAL);
 284                         break;
 285                 case 257:
 286                         units_set_mode(&unit_mode, UNITS_BINARY);
 287                         break;
 288                 default:
 289                         usage(cmd_df_usage);
 290                 }
 291         }
 292
 293         if (check_argc_max(argc, optind + 1))
 294                 usage(cmd_df_usage);
 295
 296         path = argv[optind];
 297
 298         fd = open_file_or_dir(path, &dirstream);
 299         if (fd < 0) {
 300                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 301                 return 1;
 302         }
 303         ret = get_df(fd, &sargs);
 304
 305         if (ret == 0) {
 306                 print_df(sargs, unit_mode);
 307                 free(sargs);
 308         } else {
 309                 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
 310         }
 311
 312         close_file_or_dir(fd, dirstream);
 313         return !!ret;
 314 }
 315
 316 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
 317                                         char *search)
 318 {
 319         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 320         int search_len = strlen(search);
 321
 322         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 323         uuid_unparse(fsid, uuidbuf);
 324         if (!strncmp(uuidbuf, search, search_len))
 325                 return 1;
 326
 327         if (strlen(label) && strcmp(label, search) == 0)
 328                 return 1;
 329
 330         if (strcmp(mnt, search) == 0)
 331                 return 1;
 332
 333         return 0;
 334 }
 335
 336 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
 337 {
 338         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 339         struct list_head *cur;
 340         struct btrfs_device *device;
 341         int search_len = strlen(search);
 342
 343         search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
 344         uuid_unparse(fs_devices->fsid, uuidbuf);
 345         if (!strncmp(uuidbuf, search, search_len))
 346                 return 1;
 347
 348         list_for_each(cur, &fs_devices->devices) {
 349                 device = list_entry(cur, struct btrfs_device, dev_list);
 350                 if ((device->label && strcmp(device->label, search) == 0) ||
 351                     strcmp(device->name, search) == 0)
 352                         return 1;
 353         }
 354         return 0;
 355 }
 356
 357 /*
 358  * Sort devices by devid, ascending
 359  */
 360 static int cmp_device_id(void *priv, struct list_head *a,
 361                 struct list_head *b)
 362 {
 363         const struct btrfs_device *da = list_entry(a, struct btrfs_device,
 364                         dev_list);
 365         const struct btrfs_device *db = list_entry(b, struct btrfs_device,
 366                         dev_list);
 367
 368         return da->devid < db->devid ? -1 :
 369                 da->devid > db->devid ? 1 : 0;
 370 }
 371
 372 static void splice_device_list(struct list_head *seed_devices,
 373                                struct list_head *all_devices)
 374 {
 375         struct btrfs_device *in_all, *next_all;
 376         struct btrfs_device *in_seed, *next_seed;
 377
 378         list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
 379                 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
 380                                                                 dev_list) {
 381                         if (in_all->devid == in_seed->devid) {
 382                                 /*
 383                                  * When do dev replace in a sprout fs
 384                                  * to a dev in its seed fs, the replacing
 385                                  * dev will reside in the sprout fs and
 386                                  * the replaced dev will still exist
 387                                  * in the seed fs.
 388                                  * So pick the latest one when showing
 389                                  * the sprout fs.
 390                                  */
 391                                 if (in_all->generation
 392                                                 < in_seed->generation) {
 393                                         list_del(&in_all->dev_list);
 394                                         free(in_all);
 395                                 } else if (in_all->generation
 396                                                 > in_seed->generation) {
 397                                         list_del(&in_seed->dev_list);
 398                                         free(in_seed);
 399                                 }
 400                                 break;
 401                         }
 402                 }
 403         }
 404
 405         list_splice(seed_devices, all_devices);
 406 }
 407
 408 static void print_devices(struct btrfs_fs_devices *fs_devices,
 409                           u64 *devs_found)
 410 {
 411         struct btrfs_device *device;
 412         struct btrfs_fs_devices *cur_fs;
 413         struct list_head *all_devices;
 414
 415         all_devices = &fs_devices->devices;
 416         cur_fs = fs_devices->seed;
 417         /* add all devices of seed fs to the fs to be printed */
 418         while (cur_fs) {
 419                 splice_device_list(&cur_fs->devices, all_devices);
 420                 cur_fs = cur_fs->seed;
 421         }
 422
 423         list_sort(NULL, all_devices, cmp_device_id);
 424         list_for_each_entry(device, all_devices, dev_list) {
 425                 printf("\tdevid %4llu size %s used %s path %s\n",
 426                        (unsigned long long)device->devid,
 427                        pretty_size(device->total_bytes),
 428                        pretty_size(device->bytes_used), device->name);
 429
 430                 (*devs_found)++;
 431         }
 432 }
 433
 434 static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 435 {
 436         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 437         struct btrfs_device *device;
 438         u64 devs_found = 0;
 439         u64 total;
 440
 441         if (add_seen_fsid(fs_devices->fsid))
 442                 return;
 443
 444         uuid_unparse(fs_devices->fsid, uuidbuf);
 445         device = list_entry(fs_devices->devices.next, struct btrfs_device,
 446                             dev_list);
 447         if (device->label && device->label[0])
 448                 printf("Label: '%s' ", device->label);
 449         else
 450                 printf("Label: none ");
 451
 452         total = device->total_devs;
 453         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 454                (unsigned long long)total,
 455                pretty_size(device->super_bytes_used));
 456
 457         print_devices(fs_devices, &devs_found);
 458
 459         if (devs_found < total) {
 460                 printf("\t*** Some devices missing\n");
 461         }
 462         printf("\n");
 463 }
 464
 465 /* adds up all the used spaces as reported by the space info ioctl
 466  */
 467 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 468 {
 469         u64 ret = 0;
 470         int i;
 471         for (i = 0; i < si->total_spaces; i++)
 472                 ret += si->spaces[i].used_bytes;
 473         return ret;
 474 }
 475
 476 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 477                 struct btrfs_ioctl_dev_info_args *dev_info,
 478                 struct btrfs_ioctl_space_args *space_info,
 479                 char *label, char *path)
 480 {
 481         int i;
 482         int fd;
 483         int missing = 0;
 484         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 485         struct btrfs_ioctl_dev_info_args *tmp_dev_info;
 486         int ret;
 487
 488         ret = add_seen_fsid(fs_info->fsid);
 489         if (ret == -EEXIST)
 490                 return 0;
 491         else if (ret)
 492                 return ret;
 493
 494         uuid_unparse(fs_info->fsid, uuidbuf);
 495         if (label && strlen(label))
 496                 printf("Label: '%s' ", label);
 497         else
 498                 printf("Label: none ");
 499
 500         printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 501                         fs_info->num_devices,
 502                         pretty_size(calc_used_bytes(space_info)));
 503
 504         for (i = 0; i < fs_info->num_devices; i++) {
 505                 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
 506
 507                 /* Add check for missing devices even mounted */
 508                 fd = open((char *)tmp_dev_info->path, O_RDONLY);
 509                 if (fd < 0) {
 510                         missing = 1;
 511                         continue;
 512                 }
 513                 close(fd);
 514                 printf("\tdevid %4llu size %s used %s path %s\n",
 515                         tmp_dev_info->devid,
 516                         pretty_size(tmp_dev_info->total_bytes),
 517                         pretty_size(tmp_dev_info->bytes_used),
 518                         tmp_dev_info->path);
 519         }
 520
 521         if (missing)
 522                 printf("\t*** Some devices missing\n");
 523         printf("\n");
 524         return 0;
 525 }
 526
 527 /* This function checks if the given input parameter is
 528  * an uuid or a path
 529  * return -1: some error in the given input
 530  * return 0: unknow input
 531  * return 1: given input is uuid
 532  * return 2: given input is path
 533  */
 534 static int check_arg_type(char *input)
 535 {
 536         uuid_t  out;
 537         char path[PATH_MAX];
 538
 539         if (!input)
 540                 return -EINVAL;
 541
 542         if (realpath(input, path)) {
 543                 if (is_block_device(path) == 1)
 544                         return BTRFS_ARG_BLKDEV;
 545
 546                 if (is_mount_point(path) == 1)
 547                         return BTRFS_ARG_MNTPOINT;
 548
 549                 return BTRFS_ARG_UNKNOWN;
 550         }
 551
 552         if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
 553                 !uuid_parse(input, out))
 554                 return BTRFS_ARG_UUID;
 555
 556         return BTRFS_ARG_UNKNOWN;
 557 }
 558
 559 static int btrfs_scan_kernel(void *search)
 560 {
 561         int ret = 0, fd;
 562         int found = 0;
 563         FILE *f;
 564         struct mntent *mnt;
 565         struct btrfs_ioctl_fs_info_args fs_info_arg;
 566         struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
 567         struct btrfs_ioctl_space_args *space_info_arg = NULL;
 568         char label[BTRFS_LABEL_SIZE];
 569
 570         f = setmntent("/proc/self/mounts", "r");
 571         if (f == NULL)
 572                 return 1;
 573
 574         memset(label, 0, sizeof(label));
 575         while ((mnt = getmntent(f)) != NULL) {
 576                 if (strcmp(mnt->mnt_type, "btrfs"))
 577                         continue;
 578                 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 579                                 &dev_info_arg);
 580                 if (ret)
 581                         goto out;
 582
 583                 if (get_label_mounted(mnt->mnt_dir, label)) {
 584                         kfree(dev_info_arg);
 585                         goto out;
 586                 }
 587                 if (search && !match_search_item_kernel(fs_info_arg.fsid,
 588                                         mnt->mnt_dir, label, search)) {
 589                         kfree(dev_info_arg);
 590                         continue;
 591                 }
 592
 593                 fd = open(mnt->mnt_dir, O_RDONLY);
 594                 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
 595                         print_one_fs(&fs_info_arg, dev_info_arg,
 596                                         space_info_arg, label, mnt->mnt_dir);
 597                         kfree(space_info_arg);
 598                         memset(label, 0, sizeof(label));
 599                         found = 1;
 600                 }
 601                 if (fd != -1)
 602                         close(fd);
 603                 kfree(dev_info_arg);
 604         }
 605
 606 out:
 607         endmntent(f);
 608         return !found;
 609 }
 610
 611 static int dev_to_fsid(char *dev, __u8 *fsid)
 612 {
 613         struct btrfs_super_block *disk_super;
 614         char *buf;
 615         int ret;
 616         int fd;
 617
 618         buf = malloc(4096);
 619         if (!buf)
 620                 return -ENOMEM;
 621
 622         fd = open(dev, O_RDONLY);
 623         if (fd < 0) {
 624                 ret = -errno;
 625                 free(buf);
 626                 return ret;
 627         }
 628
 629         disk_super = (struct btrfs_super_block *)buf;
 630         ret = btrfs_read_dev_super(fd, disk_super,
 631                                    BTRFS_SUPER_INFO_OFFSET, 0);
 632         if (ret)
 633                 goto out;
 634
 635         memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 636         ret = 0;
 637
 638 out:
 639         close(fd);
 640         free(buf);
 641         return ret;
 642 }
 643
 644 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 645 {
 646         struct btrfs_fs_devices *cur_seed, *next_seed;
 647         struct btrfs_device *device;
 648
 649         while (!list_empty(&fs_devices->devices)) {
 650                 device = list_entry(fs_devices->devices.next,
 651                                         struct btrfs_device, dev_list);
 652                 list_del(&device->dev_list);
 653
 654                 free(device->name);
 655                 free(device->label);
 656                 free(device);
 657         }
 658
 659         /* free seed fs chain */
 660         cur_seed = fs_devices->seed;
 661         fs_devices->seed = NULL;
 662         while (cur_seed) {
 663                 next_seed = cur_seed->seed;
 664                 free(cur_seed);
 665
 666                 cur_seed = next_seed;
 667         }
 668
 669         list_del(&fs_devices->list);
 670         free(fs_devices);
 671 }
 672
 673 static int copy_device(struct btrfs_device *dst,
 674                        struct btrfs_device *src)
 675 {
 676         dst->devid = src->devid;
 677         memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
 678         if (src->name == NULL)
 679                 dst->name = NULL;
 680         else {
 681                 dst->name = strdup(src->name);
 682                 if (!dst->name)
 683                         return -ENOMEM;
 684         }
 685         if (src->label == NULL)
 686                 dst->label = NULL;
 687         else {
 688                 dst->label = strdup(src->label);
 689                 if (!dst->label) {
 690                         free(dst->name);
 691                         return -ENOMEM;
 692                 }
 693         }
 694         dst->total_devs = src->total_devs;
 695         dst->super_bytes_used = src->super_bytes_used;
 696         dst->total_bytes = src->total_bytes;
 697         dst->bytes_used = src->bytes_used;
 698         dst->generation = src->generation;
 699
 700         return 0;
 701 }
 702
 703 static int copy_fs_devices(struct btrfs_fs_devices *dst,
 704                            struct btrfs_fs_devices *src)
 705 {
 706         struct btrfs_device *cur_dev, *dev_copy;
 707         int ret = 0;
 708
 709         memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
 710         INIT_LIST_HEAD(&dst->devices);
 711         dst->seed = NULL;
 712
 713         list_for_each_entry(cur_dev, &src->devices, dev_list) {
 714                 dev_copy = malloc(sizeof(*dev_copy));
 715                 if (!dev_copy) {
 716                         ret = -ENOMEM;
 717                         break;
 718                 }
 719
 720                 ret = copy_device(dev_copy, cur_dev);
 721                 if (ret) {
 722                         free(dev_copy);
 723                         break;
 724                 }
 725
 726                 list_add(&dev_copy->dev_list, &dst->devices);
 727                 dev_copy->fs_devices = dst;
 728         }
 729
 730         return ret;
 731 }
 732
 733 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
 734                               struct btrfs_fs_devices *copy,
 735                               struct list_head *fs_uuids) {
 736         struct btrfs_fs_devices *cur_fs;
 737
 738         list_for_each_entry(cur_fs, fs_uuids, list)
 739                 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
 740                         return copy_fs_devices(copy, cur_fs);
 741
 742         return 1;
 743 }
 744
 745 static int map_seed_devices(struct list_head *all_uuids,
 746                             char *search, int *found)
 747 {
 748         struct btrfs_fs_devices *cur_fs, *cur_seed;
 749         struct btrfs_fs_devices *fs_copy, *seed_copy;
 750         struct btrfs_fs_devices *opened_fs;
 751         struct btrfs_device *device;
 752         struct btrfs_fs_info *fs_info;
 753         struct list_head *fs_uuids;
 754         int ret = 0;
 755
 756         fs_uuids = btrfs_scanned_uuids();
 757
 758         /*
 759          * The fs_uuids list is global, and open_ctree_* will
 760          * modify it, make a private copy here
 761          */
 762         list_for_each_entry(cur_fs, fs_uuids, list) {
 763                 /* don't bother handle all fs, if search target specified */
 764                 if (search) {
 765                         if (uuid_search(cur_fs, search) == 0)
 766                                 continue;
 767                         *found = 1;
 768                 }
 769
 770                 fs_copy = malloc(sizeof(*fs_copy));
 771                 if (!fs_copy) {
 772                         ret = -ENOMEM;
 773                         goto out;
 774                 }
 775
 776                 ret = copy_fs_devices(fs_copy, cur_fs);
 777                 if (ret) {
 778                         free(fs_copy);
 779                         goto out;
 780                 }
 781
 782                 list_add(&fs_copy->list, all_uuids);
 783         }
 784
 785         list_for_each_entry(cur_fs, all_uuids, list) {
 786                 device = list_first_entry(&cur_fs->devices,
 787                                                 struct btrfs_device, dev_list);
 788                 if (!device)
 789                         continue;
 790                 /*
 791                  * open_ctree_* detects seed/sprout mapping
 792                  */
 793                 fs_info = open_ctree_fs_info(device->name, 0, 0,
 794                                                 OPEN_CTREE_PARTIAL);
 795                 if (!fs_info)
 796                         continue;
 797
 798                 /*
 799                  * copy the seed chain under the opened fs
 800                  */
 801                 opened_fs = fs_info->fs_devices;
 802                 cur_seed = cur_fs;
 803                 while (opened_fs->seed) {
 804                         seed_copy = malloc(sizeof(*seed_copy));
 805                         if (!seed_copy) {
 806                                 ret = -ENOMEM;
 807                                 goto fail_out;
 808                         }
 809                         ret = find_and_copy_seed(opened_fs->seed, seed_copy,
 810                                                  fs_uuids);
 811                         if (ret) {
 812                                 free(seed_copy);
 813                                 goto fail_out;
 814                         }
 815
 816                         cur_seed->seed = seed_copy;
 817
 818                         opened_fs = opened_fs->seed;
 819                         cur_seed = cur_seed->seed;
 820                 }
 821
 822                 close_ctree(fs_info->chunk_root);
 823         }
 824
 825 out:
 826         return ret;
 827 fail_out:
 828         close_ctree(fs_info->chunk_root);
 829         goto out;
 830 }
 831
 832 static const char * const cmd_show_usage[] = {
 833         "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
 834         "Show the structure of a filesystem",
 835         "-d|--all-devices   show only disks under /dev containing btrfs filesystem",
 836         "-m|--mounted       show only mounted btrfs",
 837         "If no argument is given, structure of all present filesystems is shown.",
 838         NULL
 839 };
 840
 841 static int cmd_show(int argc, char **argv)
 842 {
 843         LIST_HEAD(all_uuids);
 844         struct btrfs_fs_devices *fs_devices;
 845         char *search = NULL;
 846         int ret;
 847         /* default, search both kernel and udev */
 848         int where = -1;
 849         int type = 0;
 850         char mp[BTRFS_PATH_NAME_MAX + 1];
 851         char path[PATH_MAX];
 852         __u8 fsid[BTRFS_FSID_SIZE];
 853         char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 854         int found = 0;
 855
 856         while (1) {
 857                 int long_index;
 858                 static struct option long_options[] = {
 859                         { "all-devices", no_argument, NULL, 'd'},
 860                         { "mounted", no_argument, NULL, 'm'},
 861                         { NULL, no_argument, NULL, 0 },
 862                 };
 863                 int c = getopt_long(argc, argv, "dm", long_options,
 864                                         &long_index);
 865                 if (c < 0)
 866                         break;
 867                 switch (c) {
 868                 case 'd':
 869                         where = BTRFS_SCAN_LBLKID;
 870                         break;
 871                 case 'm':
 872                         where = BTRFS_SCAN_MOUNTED;
 873                         break;
 874                 default:
 875                         usage(cmd_show_usage);
 876                 }
 877         }
 878
 879         if (check_argc_max(argc, optind + 1))
 880                 usage(cmd_show_usage);
 881
 882         if (argc > optind) {
 883                 search = argv[optind];
 884                 if (strlen(search) == 0)
 885                         usage(cmd_show_usage);
 886                 type = check_arg_type(search);
 887                 /*
 888                  * needs spl handling if input arg is block dev
 889                  * And if input arg is mount-point just print it
 890                  * right away
 891                  */
 892                 if (type == BTRFS_ARG_BLKDEV) {
 893                         if (where == BTRFS_SCAN_LBLKID) {
 894                                 /* we need to do this because
 895                                  * legacy BTRFS_SCAN_DEV
 896                                  * provides /dev/dm-x paths
 897                                  */
 898                                 if (realpath(search, path))
 899                                         search = path;
 900                         } else {
 901                                 ret = get_btrfs_mount(search,
 902                                                 mp, sizeof(mp));
 903                                 if (!ret) {
 904                                         /* given block dev is mounted*/
 905                                         search = mp;
 906                                         type = BTRFS_ARG_MNTPOINT;
 907                                 } else {
 908                                         ret = dev_to_fsid(search, fsid);
 909                                         if (ret) {
 910                                                 fprintf(stderr,
 911                                                         "ERROR: No btrfs on %s\n",
 912                                                         search);
 913                                                 return 1;
 914                                         }
 915                                         uuid_unparse(fsid, uuid_buf);
 916                                         search = uuid_buf;
 917                                         type = BTRFS_ARG_UUID;
 918                                         goto devs_only;
 919                                 }
 920                         }
 921                 }
 922         }
 923
 924         if (where == BTRFS_SCAN_LBLKID)
 925                 goto devs_only;
 926
 927         /* show mounted btrfs */
 928         ret = btrfs_scan_kernel(search);
 929         if (search && !ret) {
 930                 /* since search is found we are done */
 931                 goto out;
 932         }
 933
 934         /* shows mounted only */
 935         if (where == BTRFS_SCAN_MOUNTED)
 936                 goto out;
 937
 938 devs_only:
 939         ret = btrfs_scan_lblkid(!BTRFS_UPDATE_KERNEL);
 940
 941         if (ret) {
 942                 fprintf(stderr, "ERROR: %d while scanning\n", ret);
 943                 return 1;
 944         }
 945
 946         /*
 947          * scan_for_btrfs() don't build seed/sprout mapping,
 948          * do mapping build for each scanned fs here
 949          */
 950         ret = map_seed_devices(&all_uuids, search, &found);
 951         if (ret) {
 952                 fprintf(stderr,
 953                         "ERROR: %d while mapping seed devices\n", ret);
 954                 return 1;
 955         }
 956
 957         list_for_each_entry(fs_devices, &all_uuids, list)
 958                 print_one_uuid(fs_devices);
 959
 960         if (search && !found)
 961                 ret = 1;
 962
 963         while (!list_empty(&all_uuids)) {
 964                 fs_devices = list_entry(all_uuids.next,
 965                                         struct btrfs_fs_devices, list);
 966                 free_fs_devices(fs_devices);
 967         }
 968 out:
 969         printf("%s\n", BTRFS_BUILD_VERSION);
 970         free_seen_fsid();
 971         return ret;
 972 }
 973
 974 static const char * const cmd_sync_usage[] = {
 975         "btrfs filesystem sync <path>",
 976         "Force a sync on a filesystem",
 977         NULL
 978 };
 979
 980 static int cmd_sync(int argc, char **argv)
 981 {
 982         int     fd, res, e;
 983         char    *path;
 984         DIR     *dirstream = NULL;
 985
 986         if (check_argc_exact(argc, 2))
 987                 usage(cmd_sync_usage);
 988
 989         path = argv[1];
 990
 991         fd = open_file_or_dir(path, &dirstream);
 992         if (fd < 0) {
 993                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 994                 return 1;
 995         }
 996
 997         printf("FSSync '%s'\n", path);
 998         res = ioctl(fd, BTRFS_IOC_SYNC);
 999         e = errno;
1000         close_file_or_dir(fd, dirstream);
1001         if( res < 0 ){
1002                 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
1003                         path, strerror(e));
1004                 return 1;
1005         }
1006
1007         return 0;
1008 }
1009
1010 static int parse_compress_type(char *s)
1011 {
1012         if (strcmp(optarg, "zlib") == 0)
1013                 return BTRFS_COMPRESS_ZLIB;
1014         else if (strcmp(optarg, "lzo") == 0)
1015                 return BTRFS_COMPRESS_LZO;
1016         else {
1017                 fprintf(stderr, "Unknown compress type %s\n", s);
1018                 exit(1);
1019         };
1020 }
1021
1022 static const char * const cmd_defrag_usage[] = {
1023         "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
1024         "Defragment a file or a directory",
1025         "",
1026         "-v             be verbose",
1027         "-r             defragment files recursively",
1028         "-c[zlib,lzo]   compress the file while defragmenting",
1029         "-f             flush data to disk immediately after defragmenting",
1030         "-s start       defragment only from byte onward",
1031         "-l len         defragment only up to len bytes",
1032         "-t size        minimal size of file to be considered for defragmenting",
1033         NULL
1034 };
1035
1036 static int do_defrag(int fd, int fancy_ioctl,
1037                 struct btrfs_ioctl_defrag_range_args *range)
1038 {
1039         int ret;
1040
1041         if (!fancy_ioctl)
1042                 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
1043         else
1044                 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
1045
1046         return ret;
1047 }
1048
1049 static int defrag_global_fancy_ioctl;
1050 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
1051 static int defrag_global_verbose;
1052 static int defrag_global_errors;
1053 static int defrag_callback(const char *fpath, const struct stat *sb,
1054                 int typeflag, struct FTW *ftwbuf)
1055 {
1056         int ret = 0;
1057         int e = 0;
1058         int fd = 0;
1059
1060         if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
1061                 if (defrag_global_verbose)
1062                         printf("%s\n", fpath);
1063                 fd = open(fpath, O_RDWR);
1064                 e = errno;
1065                 if (fd < 0)
1066                         goto error;
1067                 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1068                 e = errno;
1069                 close(fd);
1070                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1071                         fprintf(stderr, "ERROR: defrag range ioctl not "
1072                                 "supported in this kernel, please try "
1073                                 "without any options.\n");
1074                         defrag_global_errors++;
1075                         return ENOTTY;
1076                 }
1077                 if (ret)
1078                         goto error;
1079         }
1080         return 0;
1081
1082 error:
1083         fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
1084         defrag_global_errors++;
1085         return 0;
1086 }
1087
1088 static int cmd_defrag(int argc, char **argv)
1089 {
1090         int fd;
1091         int flush = 0;
1092         u64 start = 0;
1093         u64 len = (u64)-1;
1094         u32 thresh = 0;
1095         int i;
1096         int recursive = 0;
1097         int ret = 0;
1098         struct btrfs_ioctl_defrag_range_args range;
1099         int e = 0;
1100         int compress_type = BTRFS_COMPRESS_NONE;
1101         DIR *dirstream;
1102
1103         defrag_global_errors = 0;
1104         defrag_global_verbose = 0;
1105         defrag_global_errors = 0;
1106         defrag_global_fancy_ioctl = 0;
1107         optind = 1;
1108         while(1) {
1109                 int c = getopt(argc, argv, "vrc::fs:l:t:");
1110                 if (c < 0)
1111                         break;
1112
1113                 switch(c) {
1114                 case 'c':
1115                         compress_type = BTRFS_COMPRESS_ZLIB;
1116                         if (optarg)
1117                                 compress_type = parse_compress_type(optarg);
1118                         defrag_global_fancy_ioctl = 1;
1119                         break;
1120                 case 'f':
1121                         flush = 1;
1122                         defrag_global_fancy_ioctl = 1;
1123                         break;
1124                 case 'v':
1125                         defrag_global_verbose = 1;
1126                         break;
1127                 case 's':
1128                         start = parse_size(optarg);
1129                         defrag_global_fancy_ioctl = 1;
1130                         break;
1131                 case 'l':
1132                         len = parse_size(optarg);
1133                         defrag_global_fancy_ioctl = 1;
1134                         break;
1135                 case 't':
1136                         thresh = parse_size(optarg);
1137                         defrag_global_fancy_ioctl = 1;
1138                         break;
1139                 case 'r':
1140                         recursive = 1;
1141                         break;
1142                 default:
1143                         usage(cmd_defrag_usage);
1144                 }
1145         }
1146
1147         if (check_argc_min(argc - optind, 1))
1148                 usage(cmd_defrag_usage);
1149
1150         memset(&defrag_global_range, 0, sizeof(range));
1151         defrag_global_range.start = start;
1152         defrag_global_range.len = len;
1153         defrag_global_range.extent_thresh = thresh;
1154         if (compress_type) {
1155                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1156                 defrag_global_range.compress_type = compress_type;
1157         }
1158         if (flush)
1159                 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1160
1161         for (i = optind; i < argc; i++) {
1162                 struct stat st;
1163
1164                 dirstream = NULL;
1165                 fd = open_file_or_dir(argv[i], &dirstream);
1166                 if (fd < 0) {
1167                         fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
1168                                         strerror(errno));
1169                         defrag_global_errors++;
1170                         close_file_or_dir(fd, dirstream);
1171                         continue;
1172                 }
1173                 if (fstat(fd, &st)) {
1174                         fprintf(stderr, "ERROR: failed to stat %s - %s\n",
1175                                         argv[i], strerror(errno));
1176                         defrag_global_errors++;
1177                         close_file_or_dir(fd, dirstream);
1178                         continue;
1179                 }
1180                 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1181                         fprintf(stderr,
1182                             "ERROR: %s is not a directory or a regular file\n",
1183                             argv[i]);
1184                         defrag_global_errors++;
1185                         close_file_or_dir(fd, dirstream);
1186                         continue;
1187                 }
1188                 if (recursive) {
1189                         if (S_ISDIR(st.st_mode)) {
1190                                 ret = nftw(argv[i], defrag_callback, 10,
1191                                                 FTW_MOUNT | FTW_PHYS);
1192                                 if (ret == ENOTTY)
1193                                         exit(1);
1194                                 /* errors are handled in the callback */
1195                                 ret = 0;
1196                         } else {
1197                                 if (defrag_global_verbose)
1198                                         printf("%s\n", argv[i]);
1199                                 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1200                                                 &defrag_global_range);
1201                                 e = errno;
1202                         }
1203                 } else {
1204                         if (defrag_global_verbose)
1205                                 printf("%s\n", argv[i]);
1206                         ret = do_defrag(fd, defrag_global_fancy_ioctl,
1207                                         &defrag_global_range);
1208                         e = errno;
1209                 }
1210                 close_file_or_dir(fd, dirstream);
1211                 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1212                         fprintf(stderr, "ERROR: defrag range ioctl not "
1213                                 "supported in this kernel, please try "
1214                                 "without any options.\n");
1215                         defrag_global_errors++;
1216                         break;
1217                 }
1218                 if (ret) {
1219                         fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
1220                                 argv[i], strerror(e));
1221                         defrag_global_errors++;
1222                 }
1223         }
1224         if (defrag_global_verbose)
1225                 printf("%s\n", BTRFS_BUILD_VERSION);
1226         if (defrag_global_errors)
1227                 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1228
1229         return !!defrag_global_errors;
1230 }
1231
1232 static const char * const cmd_resize_usage[] = {
1233         "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1234         "Resize a filesystem",
1235         "If 'max' is passed, the filesystem will occupy all available space",
1236         "on the device 'devid'.",
1237         "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1238         NULL
1239 };
1240
1241 static int cmd_resize(int argc, char **argv)
1242 {
1243         struct btrfs_ioctl_vol_args     args;
1244         int     fd, res, len, e;
1245         char    *amount, *path;
1246         DIR     *dirstream = NULL;
1247
1248         if (check_argc_exact(argc, 3))
1249                 usage(cmd_resize_usage);
1250
1251         amount = argv[1];
1252         path = argv[2];
1253
1254         len = strlen(amount);
1255         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1256                 fprintf(stderr, "ERROR: size value too long ('%s)\n",
1257                         amount);
1258                 return 1;
1259         }
1260
1261         fd = open_file_or_dir(path, &dirstream);
1262         if (fd < 0) {
1263                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1264                 return 1;
1265         }
1266
1267         printf("Resize '%s' of '%s'\n", path, amount);
1268         strncpy_null(args.name, amount);
1269         res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1270         e = errno;
1271         close_file_or_dir(fd, dirstream);
1272         if( res < 0 ){
1273                 fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
1274                         path, strerror(e));
1275                 return 1;
1276         }
1277         return 0;
1278 }
1279
1280 static const char * const cmd_label_usage[] = {
1281         "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1282         "Get or change the label of a filesystem",
1283         "With one argument, get the label of filesystem on <device>.",
1284         "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1285         NULL
1286 };
1287
1288 static int cmd_label(int argc, char **argv)
1289 {
1290         if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
1291                 usage(cmd_label_usage);
1292
1293         if (argc > 2) {
1294                 return set_label(argv[1], argv[2]);
1295         } else {
1296                 char label[BTRFS_LABEL_SIZE];
1297                 int ret;
1298
1299                 ret = get_label(argv[1], label);
1300                 if (!ret)
1301                         fprintf(stdout, "%s\n", label);
1302
1303                 return ret;
1304         }
1305 }
1306
1307 const struct cmd_group filesystem_cmd_group = {
1308         filesystem_cmd_group_usage, NULL, {
1309                 { "df", cmd_df, cmd_df_usage, NULL, 0 },
1310                 { "show", cmd_show, cmd_show_usage, NULL, 0 },
1311                 { "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
1312                 { "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
1313                 { "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
1314                 { "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
1315                 { "label", cmd_label, cmd_label_usage, NULL, 0 },
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 }