cmds-inspect-dump-tree.c

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <uuid/uuid.h>
  23 #include <getopt.h>
  24
  25 #include "kerncompat.h"
  26 #include "radix-tree.h"
  27 #include "ctree.h"
  28 #include "disk-io.h"
  29 #include "print-tree.h"
  30 #include "transaction.h"
  31 #include "volumes.h"
  32 #include "commands.h"
  33 #include "utils.h"
  34 #include "help.h"
  35
  36 static void print_extents(struct btrfs_root *root, struct extent_buffer *eb)
  37 {
  38         struct extent_buffer *next;
  39         int i;
  40         u32 nr;
  41
  42         if (!eb)
  43                 return;
  44
  45         if (btrfs_is_leaf(eb)) {
  46                 btrfs_print_leaf(root, eb);
  47                 return;
  48         }
  49
  50         nr = btrfs_header_nritems(eb);
  51         for (i = 0; i < nr; i++) {
  52                 next = read_tree_block(root->fs_info,
  53                                 btrfs_node_blockptr(eb, i),
  54                                 btrfs_node_ptr_generation(eb, i));
  55                 if (!extent_buffer_uptodate(next))
  56                         continue;
  57                 if (btrfs_is_leaf(next) && btrfs_header_level(eb) != 1) {
  58                         warning(
  59         "eb corrupted: item %d eb level %d next level %d, skipping the rest",
  60                                 i, btrfs_header_level(next),
  61                                 btrfs_header_level(eb));
  62                         goto out;
  63                 }
  64                 if (btrfs_header_level(next) != btrfs_header_level(eb) - 1) {
  65                         warning(
  66         "eb corrupted: item %d eb level %d next level %d, skipping the rest",
  67                                 i, btrfs_header_level(next),
  68                                 btrfs_header_level(eb));
  69                         goto out;
  70                 }
  71                 print_extents(root, next);
  72                 free_extent_buffer(next);
  73         }
  74
  75         return;
  76
  77 out:
  78         free_extent_buffer(next);
  79 }
  80
  81 static void print_old_roots(struct btrfs_super_block *super)
  82 {
  83         struct btrfs_root_backup *backup;
  84         int i;
  85
  86         for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
  87                 backup = super->super_roots + i;
  88                 printf("btrfs root backup slot %d\n", i);
  89                 printf("\ttree root gen %llu block %llu\n",
  90                        (unsigned long long)btrfs_backup_tree_root_gen(backup),
  91                        (unsigned long long)btrfs_backup_tree_root(backup));
  92
  93                 printf("\t\textent root gen %llu block %llu\n",
  94                        (unsigned long long)btrfs_backup_extent_root_gen(backup),
  95                        (unsigned long long)btrfs_backup_extent_root(backup));
  96
  97                 printf("\t\tchunk root gen %llu block %llu\n",
  98                        (unsigned long long)btrfs_backup_chunk_root_gen(backup),
  99                        (unsigned long long)btrfs_backup_chunk_root(backup));
 100
 101                 printf("\t\tdevice root gen %llu block %llu\n",
 102                        (unsigned long long)btrfs_backup_dev_root_gen(backup),
 103                        (unsigned long long)btrfs_backup_dev_root(backup));
 104
 105                 printf("\t\tcsum root gen %llu block %llu\n",
 106                        (unsigned long long)btrfs_backup_csum_root_gen(backup),
 107                        (unsigned long long)btrfs_backup_csum_root(backup));
 108
 109                 printf("\t\tfs root gen %llu block %llu\n",
 110                        (unsigned long long)btrfs_backup_fs_root_gen(backup),
 111                        (unsigned long long)btrfs_backup_fs_root(backup));
 112
 113                 printf("\t\t%llu used %llu total %llu devices\n",
 114                        (unsigned long long)btrfs_backup_bytes_used(backup),
 115                        (unsigned long long)btrfs_backup_total_bytes(backup),
 116                        (unsigned long long)btrfs_backup_num_devices(backup));
 117         }
 118 }
 119
 120 /*
 121  * Convert a tree name from various forms to the numerical id if possible
 122  * Accepted forms:
 123  * - case does not matter
 124  * - same as the key name, BTRFS_ROOT_TREE_OBJECTID
 125  * - dtto shortened, BTRFS_ROOT_TREE
 126  * - dtto without prefix, ROOT_TREE
 127  * - common name, ROOT, CHUNK, EXTENT, ...
 128  * - dtto alias, DEVICE for DEV, CHECKSUM for CSUM
 129  *
 130  * Returns 0 if the tree id was not recognized.
 131  */
 132 static u64 treeid_from_string(const char *str, const char **end)
 133 {
 134         int match = 0;
 135         int i;
 136         u64 id;
 137         static struct treename {
 138                 const char *name;
 139                 u64 id;
 140         } tn[] = {
 141                 { "ROOT", BTRFS_ROOT_TREE_OBJECTID },
 142                 { "EXTENT", BTRFS_EXTENT_TREE_OBJECTID },
 143                 { "CHUNK", BTRFS_CHUNK_TREE_OBJECTID },
 144                 { "DEVICE", BTRFS_DEV_TREE_OBJECTID },
 145                 { "DEV", BTRFS_DEV_TREE_OBJECTID },
 146                 { "FS", BTRFS_FS_TREE_OBJECTID },
 147                 { "CSUM", BTRFS_CSUM_TREE_OBJECTID },
 148                 { "CHECKSUM", BTRFS_CSUM_TREE_OBJECTID },
 149                 { "QUOTA", BTRFS_QUOTA_TREE_OBJECTID },
 150                 { "UUID", BTRFS_UUID_TREE_OBJECTID },
 151                 { "FREE_SPACE", BTRFS_FREE_SPACE_TREE_OBJECTID },
 152                 { "TREE_LOG_FIXUP", BTRFS_TREE_LOG_FIXUP_OBJECTID },
 153                 { "TREE_LOG", BTRFS_TREE_LOG_OBJECTID },
 154                 { "TREE_RELOC", BTRFS_TREE_RELOC_OBJECTID },
 155                 { "DATA_RELOC", BTRFS_DATA_RELOC_TREE_OBJECTID }
 156         };
 157
 158         if (strncasecmp("BTRFS_", str, strlen("BTRFS_")) == 0)
 159                 str += strlen("BTRFS_");
 160
 161         for (i = 0; i < ARRAY_SIZE(tn); i++) {
 162                 int len = strlen(tn[i].name);
 163
 164                 if (strncasecmp(tn[i].name, str, len) == 0) {
 165                         id = tn[i].id;
 166                         match = 1;
 167                         str += len;
 168                         break;
 169                 }
 170         }
 171
 172         if (!match)
 173                 return 0;
 174
 175         if (strncasecmp("_TREE", str, strlen("_TREE")) == 0)
 176                 str += strlen("_TREE");
 177
 178         if (strncasecmp("_OBJECTID", str, strlen("_OBJECTID")) == 0)
 179                 str += strlen("_OBJECTID");
 180
 181         *end = str;
 182
 183         return id;
 184 }
 185
 186 const char * const cmd_inspect_dump_tree_usage[] = {
 187         "btrfs inspect-internal dump-tree [options] device",
 188         "Dump tree structures from a given device",
 189         "Dump tree structures from a given device in textual form, expand keys to human",
 190         "readable equivalents where possible.",
 191         "Note: contains file names, consider that if you're asked to send the dump",
 192         "for analysis.",
 193         "",
 194         "-e|--extents           print only extent info: extent and device trees",
 195         "-d|--device            print only device info: tree root, chunk and device trees",
 196         "-r|--roots             print only short root node info",
 197         "-R|--backups           same as --roots plus print backup root info",
 198         "-u|--uuid              print only the uuid tree",
 199         "-b|--block <block_num> print info from the specified block only",
 200         "-t|--tree <tree_id>    print only tree with the given id (string or number)",
 201         "--follow               use with -b, to show all children tree blocks of <block_num>",
 202         NULL
 203 };
 204
 205 int cmd_inspect_dump_tree(int argc, char **argv)
 206 {
 207         struct btrfs_root *root;
 208         struct btrfs_fs_info *info;
 209         struct btrfs_path path;
 210         struct btrfs_key key;
 211         struct btrfs_root_item ri;
 212         struct extent_buffer *leaf;
 213         struct btrfs_disk_key disk_key;
 214         struct btrfs_key found_key;
 215         char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
 216         int ret;
 217         int slot;
 218         int extent_only = 0;
 219         int device_only = 0;
 220         int uuid_tree_only = 0;
 221         int roots_only = 0;
 222         int root_backups = 0;
 223         unsigned open_ctree_flags = OPEN_CTREE_FS_PARTIAL;
 224         u64 block_only = 0;
 225         struct btrfs_root *tree_root_scan;
 226         u64 tree_id = 0;
 227         bool follow = false;
 228
 229         while (1) {
 230                 int c;
 231                 enum { GETOPT_VAL_FOLLOW = 256 };
 232                 static const struct option long_options[] = {
 233                         { "extents", no_argument, NULL, 'e'},
 234                         { "device", no_argument, NULL, 'd'},
 235                         { "roots", no_argument, NULL, 'r'},
 236                         { "backups", no_argument, NULL, 'R'},
 237                         { "uuid", no_argument, NULL, 'u'},
 238                         { "block", required_argument, NULL, 'b'},
 239                         { "tree", required_argument, NULL, 't'},
 240                         { "follow", no_argument, NULL, GETOPT_VAL_FOLLOW },
 241                         { NULL, 0, NULL, 0 }
 242                 };
 243
 244                 c = getopt_long(argc, argv, "deb:rRut:", long_options, NULL);
 245                 if (c < 0)
 246                         break;
 247                 switch (c) {
 248                 case 'e':
 249                         extent_only = 1;
 250                         break;
 251                 case 'd':
 252                         device_only = 1;
 253                         break;
 254                 case 'r':
 255                         roots_only = 1;
 256                         break;
 257                 case 'u':
 258                         uuid_tree_only = 1;
 259                         break;
 260                 case 'R':
 261                         roots_only = 1;
 262                         root_backups = 1;
 263                         break;
 264                 case 'b':
 265                         /*
 266                          * If only showing one block, no need to fill roots
 267                          * other than chunk root
 268                          */
 269                         open_ctree_flags |= __OPEN_CTREE_RETURN_CHUNK_ROOT;
 270                         block_only = arg_strtou64(optarg);
 271                         break;
 272                 case 't': {
 273                         const char *end = NULL;
 274
 275                         if (string_is_numerical(optarg))
 276                                 tree_id = arg_strtou64(optarg);
 277                         else
 278                                 tree_id = treeid_from_string(optarg, &end);
 279
 280                         if (!tree_id) {
 281                                 error("unrecognized tree id: %s",
 282                                                 optarg);
 283                                 exit(1);
 284                         }
 285
 286                         if (end && *end) {
 287                                 error("unexpected tree id suffix of '%s': %s",
 288                                                 optarg, end);
 289                                 exit(1);
 290                         }
 291                         break;
 292                         }
 293                 case GETOPT_VAL_FOLLOW:
 294                         follow = true;
 295                         break;
 296                 default:
 297                         usage(cmd_inspect_dump_tree_usage);
 298                 }
 299         }
 300
 301         if (check_argc_exact(argc - optind, 1))
 302                 usage(cmd_inspect_dump_tree_usage);
 303
 304         ret = check_arg_type(argv[optind]);
 305         if (ret != BTRFS_ARG_BLKDEV && ret != BTRFS_ARG_REG) {
 306                 error("not a block device or regular file: %s", argv[optind]);
 307                 goto out;
 308         }
 309
 310         printf("%s\n", PACKAGE_STRING);
 311
 312         info = open_ctree_fs_info(argv[optind], 0, 0, 0, open_ctree_flags);
 313         if (!info) {
 314                 error("unable to open %s", argv[optind]);
 315                 goto out;
 316         }
 317
 318         if (block_only) {
 319                 root = info->chunk_root;
 320                 leaf = read_tree_block(info, block_only, 0);
 321                 if (extent_buffer_uptodate(leaf) &&
 322                     btrfs_header_level(leaf) != 0) {
 323                         free_extent_buffer(leaf);
 324                         leaf = NULL;
 325                 }
 326
 327                 if (!leaf)
 328                         leaf = read_tree_block(info, block_only, 0);
 329                 if (!extent_buffer_uptodate(leaf)) {
 330                         error("failed to read %llu",
 331                                 (unsigned long long)block_only);
 332                         goto close_root;
 333                 }
 334                 btrfs_print_tree(root, leaf, follow);
 335                 free_extent_buffer(leaf);
 336                 goto close_root;
 337         }
 338
 339         root = info->fs_root;
 340         if (!root) {
 341                 error("unable to open %s", argv[optind]);
 342                 goto out;
 343         }
 344
 345         if (!(extent_only || uuid_tree_only || tree_id)) {
 346                 if (roots_only) {
 347                         printf("root tree: %llu level %d\n",
 348                              (unsigned long long)info->tree_root->node->start,
 349                              btrfs_header_level(info->tree_root->node));
 350                         printf("chunk tree: %llu level %d\n",
 351                              (unsigned long long)info->chunk_root->node->start,
 352                              btrfs_header_level(info->chunk_root->node));
 353                         if (info->log_root_tree)
 354                                 printf("log root tree: %llu level %d\n",
 355                                        info->log_root_tree->node->start,
 356                                         btrfs_header_level(
 357                                                 info->log_root_tree->node));
 358                 } else {
 359                         if (info->tree_root->node) {
 360                                 printf("root tree\n");
 361                                 btrfs_print_tree(info->tree_root,
 362                                                  info->tree_root->node, 1);
 363                         }
 364
 365                         if (info->chunk_root->node) {
 366                                 printf("chunk tree\n");
 367                                 btrfs_print_tree(info->chunk_root,
 368                                                  info->chunk_root->node, 1);
 369                         }
 370
 371                         if (info->log_root_tree) {
 372                                 printf("log root tree\n");
 373                                 btrfs_print_tree(info->log_root_tree,
 374                                                 info->log_root_tree->node, 1);
 375                         }
 376                 }
 377         }
 378         tree_root_scan = info->tree_root;
 379
 380         btrfs_init_path(&path);
 381 again:
 382         if (!extent_buffer_uptodate(tree_root_scan->node))
 383                 goto no_node;
 384
 385         /*
 386          * Tree's that are not pointed by the tree of tree roots
 387          */
 388         if (tree_id && tree_id == BTRFS_ROOT_TREE_OBJECTID) {
 389                 if (!info->tree_root->node) {
 390                         error("cannot print root tree, invalid pointer");
 391                         goto close_root;
 392                 }
 393                 printf("root tree\n");
 394                 btrfs_print_tree(info->tree_root, info->tree_root->node, 1);
 395                 goto close_root;
 396         }
 397
 398         if (tree_id && tree_id == BTRFS_CHUNK_TREE_OBJECTID) {
 399                 if (!info->chunk_root->node) {
 400                         error("cannot print chunk tree, invalid pointer");
 401                         goto close_root;
 402                 }
 403                 printf("chunk tree\n");
 404                 btrfs_print_tree(info->chunk_root, info->chunk_root->node, 1);
 405                 goto close_root;
 406         }
 407
 408         if (tree_id && tree_id == BTRFS_TREE_LOG_OBJECTID) {
 409                 if (!info->log_root_tree) {
 410                         error("cannot print log root tree, invalid pointer");
 411                         goto close_root;
 412                 }
 413                 printf("log root tree\n");
 414                 btrfs_print_tree(info->log_root_tree, info->log_root_tree->node,
 415                                  1);
 416                 goto close_root;
 417         }
 418
 419         key.offset = 0;
 420         key.objectid = 0;
 421         key.type = BTRFS_ROOT_ITEM_KEY;
 422         ret = btrfs_search_slot(NULL, tree_root_scan, &key, &path, 0, 0);
 423         if (ret < 0) {
 424                 error("cannot read ROOT_ITEM from tree %llu: %s",
 425                         (unsigned long long)tree_root_scan->root_key.objectid,
 426                         strerror(-ret));
 427                 goto close_root;
 428         }
 429         while (1) {
 430                 leaf = path.nodes[0];
 431                 slot = path.slots[0];
 432                 if (slot >= btrfs_header_nritems(leaf)) {
 433                         ret = btrfs_next_leaf(tree_root_scan, &path);
 434                         if (ret != 0)
 435                                 break;
 436                         leaf = path.nodes[0];
 437                         slot = path.slots[0];
 438                 }
 439                 btrfs_item_key(leaf, &disk_key, path.slots[0]);
 440                 btrfs_disk_key_to_cpu(&found_key, &disk_key);
 441                 if (found_key.type == BTRFS_ROOT_ITEM_KEY) {
 442                         unsigned long offset;
 443                         struct extent_buffer *buf;
 444                         int skip = extent_only | device_only | uuid_tree_only;
 445
 446                         offset = btrfs_item_ptr_offset(leaf, slot);
 447                         read_extent_buffer(leaf, &ri, offset, sizeof(ri));
 448                         buf = read_tree_block(info, btrfs_root_bytenr(&ri), 0);
 449                         if (!extent_buffer_uptodate(buf))
 450                                 goto next;
 451                         if (tree_id && found_key.objectid != tree_id) {
 452                                 free_extent_buffer(buf);
 453                                 goto next;
 454                         }
 455
 456                         switch (found_key.objectid) {
 457                         case BTRFS_ROOT_TREE_OBJECTID:
 458                                 if (!skip)
 459                                         printf("root");
 460                                 break;
 461                         case BTRFS_EXTENT_TREE_OBJECTID:
 462                                 if (!device_only && !uuid_tree_only)
 463                                         skip = 0;
 464                                 if (!skip)
 465                                         printf("extent");
 466                                 break;
 467                         case BTRFS_CHUNK_TREE_OBJECTID:
 468                                 if (!skip) {
 469                                         printf("chunk");
 470                                 }
 471                                 break;
 472                         case BTRFS_DEV_TREE_OBJECTID:
 473                                 if (!uuid_tree_only)
 474                                         skip = 0;
 475                                 if (!skip)
 476                                         printf("device");
 477                                 break;
 478                         case BTRFS_FS_TREE_OBJECTID:
 479                                 if (!skip) {
 480                                         printf("fs");
 481                                 }
 482                                 break;
 483                         case BTRFS_ROOT_TREE_DIR_OBJECTID:
 484                                 skip = 0;
 485                                 printf("directory");
 486                                 break;
 487                         case BTRFS_CSUM_TREE_OBJECTID:
 488                                 if (!skip) {
 489                                         printf("checksum");
 490                                 }
 491                                 break;
 492                         case BTRFS_ORPHAN_OBJECTID:
 493                                 if (!skip) {
 494                                         printf("orphan");
 495                                 }
 496                                 break;
 497                         case BTRFS_TREE_LOG_OBJECTID:
 498                                 if (!skip) {
 499                                         printf("log");
 500                                 }
 501                                 break;
 502                         case BTRFS_TREE_LOG_FIXUP_OBJECTID:
 503                                 if (!skip) {
 504                                         printf("log fixup");
 505                                 }
 506                                 break;
 507                         case BTRFS_TREE_RELOC_OBJECTID:
 508                                 if (!skip) {
 509                                         printf("reloc");
 510                                 }
 511                                 break;
 512                         case BTRFS_DATA_RELOC_TREE_OBJECTID:
 513                                 if (!skip) {
 514                                         printf("data reloc");
 515                                 }
 516                                 break;
 517                         case BTRFS_EXTENT_CSUM_OBJECTID:
 518                                 if (!skip) {
 519                                         printf("extent checksum");
 520                                 }
 521                                 break;
 522                         case BTRFS_QUOTA_TREE_OBJECTID:
 523                                 if (!skip) {
 524                                         printf("quota");
 525                                 }
 526                                 break;
 527                         case BTRFS_UUID_TREE_OBJECTID:
 528                                 if (!extent_only && !device_only)
 529                                         skip = 0;
 530                                 if (!skip)
 531                                         printf("uuid");
 532                                 break;
 533                         case BTRFS_FREE_SPACE_TREE_OBJECTID:
 534                                 if (!skip)
 535                                         printf("free space");
 536                                 break;
 537                         case BTRFS_MULTIPLE_OBJECTIDS:
 538                                 if (!skip) {
 539                                         printf("multiple");
 540                                 }
 541                                 break;
 542                         default:
 543                                 if (!skip) {
 544                                         printf("file");
 545                                 }
 546                         }
 547                         if (extent_only && !skip) {
 548                                 printf(" tree ");
 549                                 btrfs_print_key(&disk_key);
 550                                 printf("\n");
 551                                 print_extents(tree_root_scan, buf);
 552                         } else if (!skip) {
 553                                 printf(" tree ");
 554                                 btrfs_print_key(&disk_key);
 555                                 if (roots_only) {
 556                                         printf(" %llu level %d\n",
 557                                                (unsigned long long)buf->start,
 558                                                btrfs_header_level(buf));
 559                                 } else {
 560                                         printf(" \n");
 561                                         btrfs_print_tree(tree_root_scan, buf, 1);
 562                                 }
 563                         }
 564                         free_extent_buffer(buf);
 565                 }
 566 next:
 567                 path.slots[0]++;
 568         }
 569 no_node:
 570         btrfs_release_path(&path);
 571
 572         if (tree_root_scan == info->tree_root && info->log_root_tree) {
 573                 tree_root_scan = info->log_root_tree;
 574                 goto again;
 575         }
 576
 577         if (extent_only || device_only || uuid_tree_only)
 578                 goto close_root;
 579
 580         if (root_backups)
 581                 print_old_roots(info->super_copy);
 582
 583         printf("total bytes %llu\n",
 584                (unsigned long long)btrfs_super_total_bytes(info->super_copy));
 585         printf("bytes used %llu\n",
 586                (unsigned long long)btrfs_super_bytes_used(info->super_copy));
 587         uuidbuf[BTRFS_UUID_UNPARSED_SIZE - 1] = '\0';
 588         uuid_unparse(info->super_copy->fsid, uuidbuf);
 589         printf("uuid %s\n", uuidbuf);
 590 close_root:
 591         ret = close_ctree(root);
 592 out:
 593         return !!ret;
 594 }