fs/btrfs/print-tree.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2007 Oracle.  All rights reserved.
   4  */
   5
   6 #include "ctree.h"
   7 #include "disk-io.h"
   8 #include "print-tree.h"
   9
  10 struct root_name_map {
  11         u64 id;
  12         char name[16];
  13 };
  14
  15 static const struct root_name_map root_map[] = {
  16         { BTRFS_ROOT_TREE_OBJECTID,             "ROOT_TREE"             },
  17         { BTRFS_EXTENT_TREE_OBJECTID,           "EXTENT_TREE"           },
  18         { BTRFS_CHUNK_TREE_OBJECTID,            "CHUNK_TREE"            },
  19         { BTRFS_DEV_TREE_OBJECTID,              "DEV_TREE"              },
  20         { BTRFS_FS_TREE_OBJECTID,               "FS_TREE"               },
  21         { BTRFS_CSUM_TREE_OBJECTID,             "CSUM_TREE"             },
  22         { BTRFS_TREE_LOG_OBJECTID,              "TREE_LOG"              },
  23         { BTRFS_QUOTA_TREE_OBJECTID,            "QUOTA_TREE"            },
  24         { BTRFS_UUID_TREE_OBJECTID,             "UUID_TREE"             },
  25         { BTRFS_FREE_SPACE_TREE_OBJECTID,       "FREE_SPACE_TREE"       },
  26         { BTRFS_DATA_RELOC_TREE_OBJECTID,       "DATA_RELOC_TREE"       },
  27 };
  28
  29 const char *btrfs_root_name(const struct btrfs_key *key, char *buf)
  30 {
  31         int i;
  32
  33         if (key->objectid == BTRFS_TREE_RELOC_OBJECTID) {
  34                 snprintf(buf, BTRFS_ROOT_NAME_BUF_LEN,
  35                          "TREE_RELOC offset=%llu", key->offset);
  36                 return buf;
  37         }
  38
  39         for (i = 0; i < ARRAY_SIZE(root_map); i++) {
  40                 if (root_map[i].id == key->objectid)
  41                         return root_map[i].name;
  42         }
  43
  44         snprintf(buf, BTRFS_ROOT_NAME_BUF_LEN, "%llu", key->objectid);
  45         return buf;
  46 }
  47
  48 static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
  49 {
  50         int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
  51         int i;
  52         pr_info("\t\tchunk length %llu owner %llu type %llu num_stripes %d\n",
  53                btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk),
  54                btrfs_chunk_type(eb, chunk), num_stripes);
  55         for (i = 0 ; i < num_stripes ; i++) {
  56                 pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i,
  57                       btrfs_stripe_devid_nr(eb, chunk, i),
  58                       btrfs_stripe_offset_nr(eb, chunk, i));
  59         }
  60 }
  61 static void print_dev_item(struct extent_buffer *eb,
  62                            struct btrfs_dev_item *dev_item)
  63 {
  64         pr_info("\t\tdev item devid %llu total_bytes %llu bytes used %llu\n",
  65                btrfs_device_id(eb, dev_item),
  66                btrfs_device_total_bytes(eb, dev_item),
  67                btrfs_device_bytes_used(eb, dev_item));
  68 }
  69 static void print_extent_data_ref(struct extent_buffer *eb,
  70                                   struct btrfs_extent_data_ref *ref)
  71 {
  72         pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n",
  73                btrfs_extent_data_ref_root(eb, ref),
  74                btrfs_extent_data_ref_objectid(eb, ref),
  75                btrfs_extent_data_ref_offset(eb, ref),
  76                btrfs_extent_data_ref_count(eb, ref));
  77 }
  78
  79 static void print_extent_item(struct extent_buffer *eb, int slot, int type)
  80 {
  81         struct btrfs_extent_item *ei;
  82         struct btrfs_extent_inline_ref *iref;
  83         struct btrfs_extent_data_ref *dref;
  84         struct btrfs_shared_data_ref *sref;
  85         struct btrfs_disk_key key;
  86         unsigned long end;
  87         unsigned long ptr;
  88         u32 item_size = btrfs_item_size_nr(eb, slot);
  89         u64 flags;
  90         u64 offset;
  91         int ref_index = 0;
  92
  93         if (unlikely(item_size < sizeof(*ei))) {
  94                 btrfs_print_v0_err(eb->fs_info);
  95                 btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
  96         }
  97
  98         ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
  99         flags = btrfs_extent_flags(eb, ei);
 100
 101         pr_info("\t\textent refs %llu gen %llu flags %llu\n",
 102                btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
 103                flags);
 104
 105         if ((type == BTRFS_EXTENT_ITEM_KEY) &&
 106             flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
 107                 struct btrfs_tree_block_info *info;
 108                 info = (struct btrfs_tree_block_info *)(ei + 1);
 109                 btrfs_tree_block_key(eb, info, &key);
 110                 pr_info("\t\ttree block key (%llu %u %llu) level %d\n",
 111                        btrfs_disk_key_objectid(&key), key.type,
 112                        btrfs_disk_key_offset(&key),
 113                        btrfs_tree_block_level(eb, info));
 114                 iref = (struct btrfs_extent_inline_ref *)(info + 1);
 115         } else {
 116                 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
 117         }
 118
 119         ptr = (unsigned long)iref;
 120         end = (unsigned long)ei + item_size;
 121         while (ptr < end) {
 122                 iref = (struct btrfs_extent_inline_ref *)ptr;
 123                 type = btrfs_extent_inline_ref_type(eb, iref);
 124                 offset = btrfs_extent_inline_ref_offset(eb, iref);
 125                 pr_info("\t\tref#%d: ", ref_index++);
 126                 switch (type) {
 127                 case BTRFS_TREE_BLOCK_REF_KEY:
 128                         pr_cont("tree block backref root %llu\n", offset);
 129                         break;
 130                 case BTRFS_SHARED_BLOCK_REF_KEY:
 131                         pr_cont("shared block backref parent %llu\n", offset);
 132                         /*
 133                          * offset is supposed to be a tree block which
 134                          * must be aligned to nodesize.
 135                          */
 136                         if (!IS_ALIGNED(offset, eb->fs_info->sectorsize))
 137                                 pr_info(
 138                         "\t\t\t(parent %llu not aligned to sectorsize %u)\n",
 139                                         offset, eb->fs_info->sectorsize);
 140                         break;
 141                 case BTRFS_EXTENT_DATA_REF_KEY:
 142                         dref = (struct btrfs_extent_data_ref *)(&iref->offset);
 143                         print_extent_data_ref(eb, dref);
 144                         break;
 145                 case BTRFS_SHARED_DATA_REF_KEY:
 146                         sref = (struct btrfs_shared_data_ref *)(iref + 1);
 147                         pr_cont("shared data backref parent %llu count %u\n",
 148                                offset, btrfs_shared_data_ref_count(eb, sref));
 149                         /*
 150                          * offset is supposed to be a tree block which
 151                          * must be aligned to nodesize.
 152                          */
 153                         if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
 154                                 pr_info(
 155                         "\t\t\t(parent %llu not aligned to sectorsize %u)\n",
 156                                      offset, eb->fs_info->sectorsize);
 157                         break;
 158                 default:
 159                         pr_cont("(extent %llu has INVALID ref type %d)\n",
 160                                   eb->start, type);
 161                         return;
 162                 }
 163                 ptr += btrfs_extent_inline_ref_size(type);
 164         }
 165         WARN_ON(ptr > end);
 166 }
 167
 168 static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
 169                             u32 item_size)
 170 {
 171         if (!IS_ALIGNED(item_size, sizeof(u64))) {
 172                 pr_warn("BTRFS: uuid item with illegal size %lu!\n",
 173                         (unsigned long)item_size);
 174                 return;
 175         }
 176         while (item_size) {
 177                 __le64 subvol_id;
 178
 179                 read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id));
 180                 pr_info("\t\tsubvol_id %llu\n", le64_to_cpu(subvol_id));
 181                 item_size -= sizeof(u64);
 182                 offset += sizeof(u64);
 183         }
 184 }
 185
 186 /*
 187  * Helper to output refs and locking status of extent buffer.  Useful to debug
 188  * race condition related problems.
 189  */
 190 static void print_eb_refs_lock(struct extent_buffer *eb)
 191 {
 192 #ifdef CONFIG_BTRFS_DEBUG
 193         btrfs_info(eb->fs_info, "refs %u lock_owner %u current %u",
 194                    atomic_read(&eb->refs), eb->lock_owner, current->pid);
 195 #endif
 196 }
 197
 198 void btrfs_print_leaf(struct extent_buffer *l)
 199 {
 200         struct btrfs_fs_info *fs_info;
 201         int i;
 202         u32 type, nr;
 203         struct btrfs_item *item;
 204         struct btrfs_root_item *ri;
 205         struct btrfs_dir_item *di;
 206         struct btrfs_inode_item *ii;
 207         struct btrfs_block_group_item *bi;
 208         struct btrfs_file_extent_item *fi;
 209         struct btrfs_extent_data_ref *dref;
 210         struct btrfs_shared_data_ref *sref;
 211         struct btrfs_dev_extent *dev_extent;
 212         struct btrfs_key key;
 213         struct btrfs_key found_key;
 214
 215         if (!l)
 216                 return;
 217
 218         fs_info = l->fs_info;
 219         nr = btrfs_header_nritems(l);
 220
 221         btrfs_info(fs_info,
 222                    "leaf %llu gen %llu total ptrs %d free space %d owner %llu",
 223                    btrfs_header_bytenr(l), btrfs_header_generation(l), nr,
 224                    btrfs_leaf_free_space(l), btrfs_header_owner(l));
 225         print_eb_refs_lock(l);
 226         for (i = 0 ; i < nr ; i++) {
 227                 item = btrfs_item_nr(i);
 228                 btrfs_item_key_to_cpu(l, &key, i);
 229                 type = key.type;
 230                 pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n",
 231                         i, key.objectid, type, key.offset,
 232                         btrfs_item_offset(l, item), btrfs_item_size(l, item));
 233                 switch (type) {
 234                 case BTRFS_INODE_ITEM_KEY:
 235                         ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
 236                         pr_info("\t\tinode generation %llu size %llu mode %o\n",
 237                                btrfs_inode_generation(l, ii),
 238                                btrfs_inode_size(l, ii),
 239                                btrfs_inode_mode(l, ii));
 240                         break;
 241                 case BTRFS_DIR_ITEM_KEY:
 242                         di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
 243                         btrfs_dir_item_key_to_cpu(l, di, &found_key);
 244                         pr_info("\t\tdir oid %llu type %u\n",
 245                                 found_key.objectid,
 246                                 btrfs_dir_type(l, di));
 247                         break;
 248                 case BTRFS_ROOT_ITEM_KEY:
 249                         ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
 250                         pr_info("\t\troot data bytenr %llu refs %u\n",
 251                                 btrfs_disk_root_bytenr(l, ri),
 252                                 btrfs_disk_root_refs(l, ri));
 253                         break;
 254                 case BTRFS_EXTENT_ITEM_KEY:
 255                 case BTRFS_METADATA_ITEM_KEY:
 256                         print_extent_item(l, i, type);
 257                         break;
 258                 case BTRFS_TREE_BLOCK_REF_KEY:
 259                         pr_info("\t\ttree block backref\n");
 260                         break;
 261                 case BTRFS_SHARED_BLOCK_REF_KEY:
 262                         pr_info("\t\tshared block backref\n");
 263                         break;
 264                 case BTRFS_EXTENT_DATA_REF_KEY:
 265                         dref = btrfs_item_ptr(l, i,
 266                                               struct btrfs_extent_data_ref);
 267                         print_extent_data_ref(l, dref);
 268                         break;
 269                 case BTRFS_SHARED_DATA_REF_KEY:
 270                         sref = btrfs_item_ptr(l, i,
 271                                               struct btrfs_shared_data_ref);
 272                         pr_info("\t\tshared data backref count %u\n",
 273                                btrfs_shared_data_ref_count(l, sref));
 274                         break;
 275                 case BTRFS_EXTENT_DATA_KEY:
 276                         fi = btrfs_item_ptr(l, i,
 277                                             struct btrfs_file_extent_item);
 278                         if (btrfs_file_extent_type(l, fi) ==
 279                             BTRFS_FILE_EXTENT_INLINE) {
 280                                 pr_info("\t\tinline extent data size %llu\n",
 281                                        btrfs_file_extent_ram_bytes(l, fi));
 282                                 break;
 283                         }
 284                         pr_info("\t\textent data disk bytenr %llu nr %llu\n",
 285                                btrfs_file_extent_disk_bytenr(l, fi),
 286                                btrfs_file_extent_disk_num_bytes(l, fi));
 287                         pr_info("\t\textent data offset %llu nr %llu ram %llu\n",
 288                                btrfs_file_extent_offset(l, fi),
 289                                btrfs_file_extent_num_bytes(l, fi),
 290                                btrfs_file_extent_ram_bytes(l, fi));
 291                         break;
 292                 case BTRFS_EXTENT_REF_V0_KEY:
 293                         btrfs_print_v0_err(fs_info);
 294                         btrfs_handle_fs_error(fs_info, -EINVAL, NULL);
 295                         break;
 296                 case BTRFS_BLOCK_GROUP_ITEM_KEY:
 297                         bi = btrfs_item_ptr(l, i,
 298                                             struct btrfs_block_group_item);
 299                         pr_info(
 300                    "\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
 301                                 btrfs_block_group_used(l, bi),
 302                                 btrfs_block_group_chunk_objectid(l, bi),
 303                                 btrfs_block_group_flags(l, bi));
 304                         break;
 305                 case BTRFS_CHUNK_ITEM_KEY:
 306                         print_chunk(l, btrfs_item_ptr(l, i,
 307                                                       struct btrfs_chunk));
 308                         break;
 309                 case BTRFS_DEV_ITEM_KEY:
 310                         print_dev_item(l, btrfs_item_ptr(l, i,
 311                                         struct btrfs_dev_item));
 312                         break;
 313                 case BTRFS_DEV_EXTENT_KEY:
 314                         dev_extent = btrfs_item_ptr(l, i,
 315                                                     struct btrfs_dev_extent);
 316                         pr_info("\t\tdev extent chunk_tree %llu\n\t\tchunk objectid %llu chunk offset %llu length %llu\n",
 317                                btrfs_dev_extent_chunk_tree(l, dev_extent),
 318                                btrfs_dev_extent_chunk_objectid(l, dev_extent),
 319                                btrfs_dev_extent_chunk_offset(l, dev_extent),
 320                                btrfs_dev_extent_length(l, dev_extent));
 321                         break;
 322                 case BTRFS_PERSISTENT_ITEM_KEY:
 323                         pr_info("\t\tpersistent item objectid %llu offset %llu\n",
 324                                         key.objectid, key.offset);
 325                         switch (key.objectid) {
 326                         case BTRFS_DEV_STATS_OBJECTID:
 327                                 pr_info("\t\tdevice stats\n");
 328                                 break;
 329                         default:
 330                                 pr_info("\t\tunknown persistent item\n");
 331                         }
 332                         break;
 333                 case BTRFS_TEMPORARY_ITEM_KEY:
 334                         pr_info("\t\ttemporary item objectid %llu offset %llu\n",
 335                                         key.objectid, key.offset);
 336                         switch (key.objectid) {
 337                         case BTRFS_BALANCE_OBJECTID:
 338                                 pr_info("\t\tbalance status\n");
 339                                 break;
 340                         default:
 341                                 pr_info("\t\tunknown temporary item\n");
 342                         }
 343                         break;
 344                 case BTRFS_DEV_REPLACE_KEY:
 345                         pr_info("\t\tdev replace\n");
 346                         break;
 347                 case BTRFS_UUID_KEY_SUBVOL:
 348                 case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
 349                         print_uuid_item(l, btrfs_item_ptr_offset(l, i),
 350                                         btrfs_item_size_nr(l, i));
 351                         break;
 352                 }
 353         }
 354 }
 355
 356 void btrfs_print_tree(struct extent_buffer *c, bool follow)
 357 {
 358         struct btrfs_fs_info *fs_info;
 359         int i; u32 nr;
 360         struct btrfs_key key;
 361         int level;
 362
 363         if (!c)
 364                 return;
 365         fs_info = c->fs_info;
 366         nr = btrfs_header_nritems(c);
 367         level = btrfs_header_level(c);
 368         if (level == 0) {
 369                 btrfs_print_leaf(c);
 370                 return;
 371         }
 372         btrfs_info(fs_info,
 373                    "node %llu level %d gen %llu total ptrs %d free spc %u owner %llu",
 374                    btrfs_header_bytenr(c), level, btrfs_header_generation(c),
 375                    nr, (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr,
 376                    btrfs_header_owner(c));
 377         print_eb_refs_lock(c);
 378         for (i = 0; i < nr; i++) {
 379                 btrfs_node_key_to_cpu(c, &key, i);
 380                 pr_info("\tkey %d (%llu %u %llu) block %llu gen %llu\n",
 381                        i, key.objectid, key.type, key.offset,
 382                        btrfs_node_blockptr(c, i),
 383                        btrfs_node_ptr_generation(c, i));
 384         }
 385         if (!follow)
 386                 return;
 387         for (i = 0; i < nr; i++) {
 388                 struct btrfs_key first_key;
 389                 struct extent_buffer *next;
 390
 391                 btrfs_node_key_to_cpu(c, &first_key, i);
 392                 next = read_tree_block(fs_info, btrfs_node_blockptr(c, i),
 393                                        btrfs_header_owner(c),
 394                                        btrfs_node_ptr_generation(c, i),
 395                                        level - 1, &first_key);
 396                 if (IS_ERR(next)) {
 397                         continue;
 398                 } else if (!extent_buffer_uptodate(next)) {
 399                         free_extent_buffer(next);
 400                         continue;
 401                 }
 402
 403                 if (btrfs_is_leaf(next) &&
 404                    level != 1)
 405                         BUG();
 406                 if (btrfs_header_level(next) !=
 407                        level - 1)
 408                         BUG();
 409                 btrfs_print_tree(next, follow);
 410                 free_extent_buffer(next);
 411         }
 412 }