fs/btrfs/print-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 "ctree.h"
  20 #include "disk-io.h"
  21 #include "print-tree.h"
  22
  23 static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
  24 {
  25         int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
  26         int i;
  27         pr_info("\t\tchunk length %llu owner %llu type %llu num_stripes %d\n",
  28                btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk),
  29                btrfs_chunk_type(eb, chunk), num_stripes);
  30         for (i = 0 ; i < num_stripes ; i++) {
  31                 pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i,
  32                       btrfs_stripe_devid_nr(eb, chunk, i),
  33                       btrfs_stripe_offset_nr(eb, chunk, i));
  34         }
  35 }
  36 static void print_dev_item(struct extent_buffer *eb,
  37                            struct btrfs_dev_item *dev_item)
  38 {
  39         pr_info("\t\tdev item devid %llu total_bytes %llu bytes used %llu\n",
  40                btrfs_device_id(eb, dev_item),
  41                btrfs_device_total_bytes(eb, dev_item),
  42                btrfs_device_bytes_used(eb, dev_item));
  43 }
  44 static void print_extent_data_ref(struct extent_buffer *eb,
  45                                   struct btrfs_extent_data_ref *ref)
  46 {
  47         pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n",
  48                btrfs_extent_data_ref_root(eb, ref),
  49                btrfs_extent_data_ref_objectid(eb, ref),
  50                btrfs_extent_data_ref_offset(eb, ref),
  51                btrfs_extent_data_ref_count(eb, ref));
  52 }
  53
  54 static void print_extent_item(struct extent_buffer *eb, int slot, int type)
  55 {
  56         struct btrfs_extent_item *ei;
  57         struct btrfs_extent_inline_ref *iref;
  58         struct btrfs_extent_data_ref *dref;
  59         struct btrfs_shared_data_ref *sref;
  60         struct btrfs_disk_key key;
  61         unsigned long end;
  62         unsigned long ptr;
  63         u32 item_size = btrfs_item_size_nr(eb, slot);
  64         u64 flags;
  65         u64 offset;
  66         int ref_index = 0;
  67
  68         if (item_size < sizeof(*ei)) {
  69 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
  70                 struct btrfs_extent_item_v0 *ei0;
  71                 BUG_ON(item_size != sizeof(*ei0));
  72                 ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0);
  73                 pr_info("\t\textent refs %u\n",
  74                        btrfs_extent_refs_v0(eb, ei0));
  75                 return;
  76 #else
  77                 BUG();
  78 #endif
  79         }
  80
  81         ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
  82         flags = btrfs_extent_flags(eb, ei);
  83
  84         pr_info("\t\textent refs %llu gen %llu flags %llu\n",
  85                btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
  86                flags);
  87
  88         if ((type == BTRFS_EXTENT_ITEM_KEY) &&
  89             flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
  90                 struct btrfs_tree_block_info *info;
  91                 info = (struct btrfs_tree_block_info *)(ei + 1);
  92                 btrfs_tree_block_key(eb, info, &key);
  93                 pr_info("\t\ttree block key (%llu %u %llu) level %d\n",
  94                        btrfs_disk_key_objectid(&key), key.type,
  95                        btrfs_disk_key_offset(&key),
  96                        btrfs_tree_block_level(eb, info));
  97                 iref = (struct btrfs_extent_inline_ref *)(info + 1);
  98         } else {
  99                 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
 100         }
 101
 102         ptr = (unsigned long)iref;
 103         end = (unsigned long)ei + item_size;
 104         while (ptr < end) {
 105                 iref = (struct btrfs_extent_inline_ref *)ptr;
 106                 type = btrfs_extent_inline_ref_type(eb, iref);
 107                 offset = btrfs_extent_inline_ref_offset(eb, iref);
 108                 pr_info("\t\tref#%d: ", ref_index++);
 109                 switch (type) {
 110                 case BTRFS_TREE_BLOCK_REF_KEY:
 111                         pr_cont("tree block backref root %llu\n", offset);
 112                         break;
 113                 case BTRFS_SHARED_BLOCK_REF_KEY:
 114                         pr_cont("shared block backref parent %llu\n", offset);
 115                         /*
 116                          * offset is supposed to be a tree block which
 117                          * must be aligned to nodesize.
 118                          */
 119                         if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
 120                                 pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
 121                                         offset, (unsigned long long)eb->fs_info->nodesize);
 122                         break;
 123                 case BTRFS_EXTENT_DATA_REF_KEY:
 124                         dref = (struct btrfs_extent_data_ref *)(&iref->offset);
 125                         print_extent_data_ref(eb, dref);
 126                         break;
 127                 case BTRFS_SHARED_DATA_REF_KEY:
 128                         sref = (struct btrfs_shared_data_ref *)(iref + 1);
 129                         pr_cont("shared data backref parent %llu count %u\n",
 130                                offset, btrfs_shared_data_ref_count(eb, sref));
 131                         /*
 132                          * offset is supposed to be a tree block which
 133                          * must be aligned to nodesize.
 134                          */
 135                         if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
 136                                 pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
 137                                      offset, (unsigned long long)eb->fs_info->nodesize);
 138                         break;
 139                 default:
 140                         pr_cont("(extent %llu has INVALID ref type %d)\n",
 141                                   eb->start, type);
 142                         return;
 143                 }
 144                 ptr += btrfs_extent_inline_ref_size(type);
 145         }
 146         WARN_ON(ptr > end);
 147 }
 148
 149 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
 150 static void print_extent_ref_v0(struct extent_buffer *eb, int slot)
 151 {
 152         struct btrfs_extent_ref_v0 *ref0;
 153
 154         ref0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_ref_v0);
 155         printk("\t\textent back ref root %llu gen %llu owner %llu num_refs %lu\n",
 156                 btrfs_ref_root_v0(eb, ref0),
 157                 btrfs_ref_generation_v0(eb, ref0),
 158                 btrfs_ref_objectid_v0(eb, ref0),
 159                 (unsigned long)btrfs_ref_count_v0(eb, ref0));
 160 }
 161 #endif
 162
 163 static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
 164                             u32 item_size)
 165 {
 166         if (!IS_ALIGNED(item_size, sizeof(u64))) {
 167                 pr_warn("BTRFS: uuid item with illegal size %lu!\n",
 168                         (unsigned long)item_size);
 169                 return;
 170         }
 171         while (item_size) {
 172                 __le64 subvol_id;
 173
 174                 read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id));
 175                 pr_info("\t\tsubvol_id %llu\n",
 176                        (unsigned long long)le64_to_cpu(subvol_id));
 177                 item_size -= sizeof(u64);
 178                 offset += sizeof(u64);
 179         }
 180 }
 181
 182 void btrfs_print_leaf(struct extent_buffer *l)
 183 {
 184         struct btrfs_fs_info *fs_info;
 185         int i;
 186         u32 type, nr;
 187         struct btrfs_item *item;
 188         struct btrfs_root_item *ri;
 189         struct btrfs_dir_item *di;
 190         struct btrfs_inode_item *ii;
 191         struct btrfs_block_group_item *bi;
 192         struct btrfs_file_extent_item *fi;
 193         struct btrfs_extent_data_ref *dref;
 194         struct btrfs_shared_data_ref *sref;
 195         struct btrfs_dev_extent *dev_extent;
 196         struct btrfs_key key;
 197         struct btrfs_key found_key;
 198
 199         if (!l)
 200                 return;
 201
 202         fs_info = l->fs_info;
 203         nr = btrfs_header_nritems(l);
 204
 205         btrfs_info(fs_info, "leaf %llu total ptrs %d free space %d",
 206                    btrfs_header_bytenr(l), nr,
 207                    btrfs_leaf_free_space(fs_info, l));
 208         for (i = 0 ; i < nr ; i++) {
 209                 item = btrfs_item_nr(i);
 210                 btrfs_item_key_to_cpu(l, &key, i);
 211                 type = key.type;
 212                 pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n",
 213                         i, key.objectid, type, key.offset,
 214                         btrfs_item_offset(l, item), btrfs_item_size(l, item));
 215                 switch (type) {
 216                 case BTRFS_INODE_ITEM_KEY:
 217                         ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
 218                         pr_info("\t\tinode generation %llu size %llu mode %o\n",
 219                                btrfs_inode_generation(l, ii),
 220                                btrfs_inode_size(l, ii),
 221                                btrfs_inode_mode(l, ii));
 222                         break;
 223                 case BTRFS_DIR_ITEM_KEY:
 224                         di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
 225                         btrfs_dir_item_key_to_cpu(l, di, &found_key);
 226                         pr_info("\t\tdir oid %llu type %u\n",
 227                                 found_key.objectid,
 228                                 btrfs_dir_type(l, di));
 229                         break;
 230                 case BTRFS_ROOT_ITEM_KEY:
 231                         ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
 232                         pr_info("\t\troot data bytenr %llu refs %u\n",
 233                                 btrfs_disk_root_bytenr(l, ri),
 234                                 btrfs_disk_root_refs(l, ri));
 235                         break;
 236                 case BTRFS_EXTENT_ITEM_KEY:
 237                 case BTRFS_METADATA_ITEM_KEY:
 238                         print_extent_item(l, i, type);
 239                         break;
 240                 case BTRFS_TREE_BLOCK_REF_KEY:
 241                         pr_info("\t\ttree block backref\n");
 242                         break;
 243                 case BTRFS_SHARED_BLOCK_REF_KEY:
 244                         pr_info("\t\tshared block backref\n");
 245                         break;
 246                 case BTRFS_EXTENT_DATA_REF_KEY:
 247                         dref = btrfs_item_ptr(l, i,
 248                                               struct btrfs_extent_data_ref);
 249                         print_extent_data_ref(l, dref);
 250                         break;
 251                 case BTRFS_SHARED_DATA_REF_KEY:
 252                         sref = btrfs_item_ptr(l, i,
 253                                               struct btrfs_shared_data_ref);
 254                         pr_info("\t\tshared data backref count %u\n",
 255                                btrfs_shared_data_ref_count(l, sref));
 256                         break;
 257                 case BTRFS_EXTENT_DATA_KEY:
 258                         fi = btrfs_item_ptr(l, i,
 259                                             struct btrfs_file_extent_item);
 260                         if (btrfs_file_extent_type(l, fi) ==
 261                             BTRFS_FILE_EXTENT_INLINE) {
 262                                 pr_info("\t\tinline extent data size %u\n",
 263                                        btrfs_file_extent_inline_len(l, i, fi));
 264                                 break;
 265                         }
 266                         pr_info("\t\textent data disk bytenr %llu nr %llu\n",
 267                                btrfs_file_extent_disk_bytenr(l, fi),
 268                                btrfs_file_extent_disk_num_bytes(l, fi));
 269                         pr_info("\t\textent data offset %llu nr %llu ram %llu\n",
 270                                btrfs_file_extent_offset(l, fi),
 271                                btrfs_file_extent_num_bytes(l, fi),
 272                                btrfs_file_extent_ram_bytes(l, fi));
 273                         break;
 274                 case BTRFS_EXTENT_REF_V0_KEY:
 275 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
 276                         print_extent_ref_v0(l, i);
 277 #else
 278                         BUG();
 279 #endif
 280                         break;
 281                 case BTRFS_BLOCK_GROUP_ITEM_KEY:
 282                         bi = btrfs_item_ptr(l, i,
 283                                             struct btrfs_block_group_item);
 284                         pr_info(
 285                    "\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
 286                                 btrfs_disk_block_group_used(l, bi),
 287                                 btrfs_disk_block_group_chunk_objectid(l, bi),
 288                                 btrfs_disk_block_group_flags(l, bi));
 289                         break;
 290                 case BTRFS_CHUNK_ITEM_KEY:
 291                         print_chunk(l, btrfs_item_ptr(l, i,
 292                                                       struct btrfs_chunk));
 293                         break;
 294                 case BTRFS_DEV_ITEM_KEY:
 295                         print_dev_item(l, btrfs_item_ptr(l, i,
 296                                         struct btrfs_dev_item));
 297                         break;
 298                 case BTRFS_DEV_EXTENT_KEY:
 299                         dev_extent = btrfs_item_ptr(l, i,
 300                                                     struct btrfs_dev_extent);
 301                         pr_info("\t\tdev extent chunk_tree %llu\n\t\tchunk objectid %llu chunk offset %llu length %llu\n",
 302                                btrfs_dev_extent_chunk_tree(l, dev_extent),
 303                                btrfs_dev_extent_chunk_objectid(l, dev_extent),
 304                                btrfs_dev_extent_chunk_offset(l, dev_extent),
 305                                btrfs_dev_extent_length(l, dev_extent));
 306                         break;
 307                 case BTRFS_PERSISTENT_ITEM_KEY:
 308                         pr_info("\t\tpersistent item objectid %llu offset %llu\n",
 309                                         key.objectid, key.offset);
 310                         switch (key.objectid) {
 311                         case BTRFS_DEV_STATS_OBJECTID:
 312                                 pr_info("\t\tdevice stats\n");
 313                                 break;
 314                         default:
 315                                 pr_info("\t\tunknown persistent item\n");
 316                         }
 317                         break;
 318                 case BTRFS_TEMPORARY_ITEM_KEY:
 319                         pr_info("\t\ttemporary item objectid %llu offset %llu\n",
 320                                         key.objectid, key.offset);
 321                         switch (key.objectid) {
 322                         case BTRFS_BALANCE_OBJECTID:
 323                                 pr_info("\t\tbalance status\n");
 324                                 break;
 325                         default:
 326                                 pr_info("\t\tunknown temporary item\n");
 327                         }
 328                         break;
 329                 case BTRFS_DEV_REPLACE_KEY:
 330                         pr_info("\t\tdev replace\n");
 331                         break;
 332                 case BTRFS_UUID_KEY_SUBVOL:
 333                 case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
 334                         print_uuid_item(l, btrfs_item_ptr_offset(l, i),
 335                                         btrfs_item_size_nr(l, i));
 336                         break;
 337                 };
 338         }
 339 }
 340
 341 void btrfs_print_tree(struct extent_buffer *c)
 342 {
 343         struct btrfs_fs_info *fs_info;
 344         int i; u32 nr;
 345         struct btrfs_key key;
 346         int level;
 347
 348         if (!c)
 349                 return;
 350         fs_info = c->fs_info;
 351         nr = btrfs_header_nritems(c);
 352         level = btrfs_header_level(c);
 353         if (level == 0) {
 354                 btrfs_print_leaf(c);
 355                 return;
 356         }
 357         btrfs_info(fs_info,
 358                    "node %llu level %d total ptrs %d free spc %u",
 359                    btrfs_header_bytenr(c), level, nr,
 360                    (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr);
 361         for (i = 0; i < nr; i++) {
 362                 btrfs_node_key_to_cpu(c, &key, i);
 363                 pr_info("\tkey %d (%llu %u %llu) block %llu\n",
 364                        i, key.objectid, key.type, key.offset,
 365                        btrfs_node_blockptr(c, i));
 366         }
 367         for (i = 0; i < nr; i++) {
 368                 struct extent_buffer *next = read_tree_block(fs_info,
 369                                         btrfs_node_blockptr(c, i),
 370                                         btrfs_node_ptr_generation(c, i));
 371                 if (IS_ERR(next)) {
 372                         continue;
 373                 } else if (!extent_buffer_uptodate(next)) {
 374                         free_extent_buffer(next);
 375                         continue;
 376                 }
 377
 378                 if (btrfs_is_leaf(next) &&
 379                    level != 1)
 380                         BUG();
 381                 if (btrfs_header_level(next) !=
 382                        level - 1)
 383                         BUG();
 384                 btrfs_print_tree(next);
 385                 free_extent_buffer(next);
 386         }
 387 }