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