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