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 <stdio.h>
  20 #include <stdlib.h>
  21 #include <uuid/uuid.h>
  22 #include "kerncompat.h"
  23 #include "radix-tree.h"
  24 #include "ctree.h"
  25 #include "disk-io.h"
  26 #include "print-tree.h"
  27
  28 static int print_dir_item(struct extent_buffer *eb, struct btrfs_item *item,
  29                           struct btrfs_dir_item *di)
  30 {
  31         u32 total;
  32         u32 cur = 0;
  33         u32 len;
  34         u32 name_len;
  35         u32 data_len;
  36         char namebuf[BTRFS_NAME_LEN];
  37         struct btrfs_disk_key location;
  38
  39         total = btrfs_item_size(eb, item);
  40         while(cur < total) {
  41                 btrfs_dir_item_key(eb, di, &location);
  42                 printf("\t\tlocation ");
  43                 btrfs_print_key(&location);
  44                 printf(" type %u\n", btrfs_dir_type(eb, di));
  45                 name_len = btrfs_dir_name_len(eb, di);
  46                 data_len = btrfs_dir_data_len(eb, di);
  47                 len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);
  48                 read_extent_buffer(eb, namebuf, (unsigned long)(di + 1), len);
  49                 printf("\t\tnamelen %u datalen %u name: %.*s\n",
  50                        name_len, data_len, len, namebuf);
  51                 len = sizeof(*di) + name_len + data_len;
  52                 di = (struct btrfs_dir_item *)((char *)di + len);
  53                 cur += len;
  54         }
  55         return 0;
  56 }
  57
  58 static int print_inode_ref_item(struct extent_buffer *eb, struct btrfs_item *item,
  59                                 struct btrfs_inode_ref *ref)
  60 {
  61         u32 total;
  62         u32 cur = 0;
  63         u32 len;
  64         u32 name_len;
  65         u64 index;
  66         char namebuf[BTRFS_NAME_LEN];
  67         total = btrfs_item_size(eb, item);
  68         while(cur < total) {
  69                 name_len = btrfs_inode_ref_name_len(eb, ref);
  70                 index = btrfs_inode_ref_index(eb, ref);
  71                 len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);
  72                 read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len);
  73                 printf("\t\tinode ref index %llu namelen %u name: %.*s\n",
  74                        (unsigned long long)index, name_len, len, namebuf);
  75                 len = sizeof(*ref) + name_len;
  76                 ref = (struct btrfs_inode_ref *)((char *)ref + len);
  77                 cur += len;
  78         }
  79         return 0;
  80 }
  81
  82 static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
  83 {
  84         int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
  85         int i;
  86         printf("\t\tchunk length %llu owner %llu type %llu num_stripes %d\n",
  87                (unsigned long long)btrfs_chunk_length(eb, chunk),
  88                (unsigned long long)btrfs_chunk_owner(eb, chunk),
  89                (unsigned long long)btrfs_chunk_type(eb, chunk),
  90                num_stripes);
  91         for (i = 0 ; i < num_stripes ; i++) {
  92                 printf("\t\t\tstripe %d devid %llu offset %llu\n", i,
  93                       (unsigned long long)btrfs_stripe_devid_nr(eb, chunk, i),
  94                       (unsigned long long)btrfs_stripe_offset_nr(eb, chunk, i));
  95         }
  96 }
  97 static void print_dev_item(struct extent_buffer *eb,
  98                            struct btrfs_dev_item *dev_item)
  99 {
 100         printf("\t\tdev item devid %llu "
 101                "total_bytes %llu bytes used %Lu\n",
 102                (unsigned long long)btrfs_device_id(eb, dev_item),
 103                (unsigned long long)btrfs_device_total_bytes(eb, dev_item),
 104                (unsigned long long)btrfs_device_bytes_used(eb, dev_item));
 105 }
 106
 107 static void print_uuids(struct extent_buffer *eb)
 108 {
 109         char fs_uuid[37];
 110         char chunk_uuid[37];
 111         u8 disk_uuid[BTRFS_UUID_SIZE];
 112
 113         read_extent_buffer(eb, disk_uuid, (unsigned long)btrfs_header_fsid(eb),
 114                            BTRFS_FSID_SIZE);
 115
 116         fs_uuid[36] = '\0';
 117         uuid_unparse(disk_uuid, fs_uuid);
 118
 119         read_extent_buffer(eb, disk_uuid,
 120                            (unsigned long)btrfs_header_chunk_tree_uuid(eb),
 121                            BTRFS_UUID_SIZE);
 122
 123         chunk_uuid[36] = '\0';
 124         uuid_unparse(disk_uuid, chunk_uuid);
 125         printf("fs uuid %s\nchunk uuid %s\n", fs_uuid, chunk_uuid);
 126 }
 127
 128 static void print_file_extent_item(struct extent_buffer *eb,
 129                                    struct btrfs_item *item,
 130                                    struct btrfs_file_extent_item *fi)
 131 {
 132         int extent_type = btrfs_file_extent_type(eb, fi);
 133
 134         if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
 135                 printf("\t\tinline extent data size %u "
 136                        "ram %u compress %d\n",
 137                   btrfs_file_extent_inline_item_len(eb, item),
 138                   btrfs_file_extent_inline_len(eb, fi),
 139                   btrfs_file_extent_compression(eb, fi));
 140                 return;
 141         }
 142         if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
 143                 printf("\t\tprealloc data disk byte %llu nr %llu\n",
 144                   (unsigned long long)btrfs_file_extent_disk_bytenr(eb, fi),
 145                   (unsigned long long)btrfs_file_extent_disk_num_bytes(eb, fi));
 146                 printf("\t\tprealloc data offset %llu nr %llu\n",
 147                   (unsigned long long)btrfs_file_extent_offset(eb, fi),
 148                   (unsigned long long)btrfs_file_extent_num_bytes(eb, fi));
 149                 return;
 150         }
 151         printf("\t\textent data disk byte %llu nr %llu\n",
 152                 (unsigned long long)btrfs_file_extent_disk_bytenr(eb, fi),
 153                 (unsigned long long)btrfs_file_extent_disk_num_bytes(eb, fi));
 154         printf("\t\textent data offset %llu nr %llu ram %llu\n",
 155                 (unsigned long long)btrfs_file_extent_offset(eb, fi),
 156                 (unsigned long long)btrfs_file_extent_num_bytes(eb, fi),
 157                 (unsigned long long)btrfs_file_extent_ram_bytes(eb, fi));
 158         printf("\t\textent compression %d\n",
 159                btrfs_file_extent_compression(eb, fi));
 160 }
 161
 162
 163 static void print_root_ref(struct extent_buffer *leaf, int slot, char *tag)
 164 {
 165         struct btrfs_root_ref *ref;
 166         char namebuf[BTRFS_NAME_LEN];
 167         int namelen;
 168
 169         ref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
 170         namelen = btrfs_root_ref_name_len(leaf, ref);
 171         read_extent_buffer(leaf, namebuf, (unsigned long)(ref + 1), namelen);
 172         printf("\t\troot %s key dirid %llu sequence %llu name %.*s\n", tag,
 173                (unsigned long long)btrfs_root_ref_dirid(leaf, ref),
 174                (unsigned long long)btrfs_root_ref_sequence(leaf, ref),
 175                namelen, namebuf);
 176 }
 177
 178 static void print_key_type(u8 type)
 179 {
 180         switch (type) {
 181         case BTRFS_INODE_ITEM_KEY:
 182                 printf("INODE_ITEM");
 183                 break;
 184         case BTRFS_INODE_REF_KEY:
 185                 printf("INODE_REF");
 186                 break;
 187         case BTRFS_DIR_ITEM_KEY:
 188                 printf("DIR_ITEM");
 189                 break;
 190         case BTRFS_DIR_INDEX_KEY:
 191                 printf("DIR_INDEX");
 192                 break;
 193         case BTRFS_DIR_LOG_ITEM_KEY:
 194                 printf("DIR_LOG_ITEM");
 195                 break;
 196         case BTRFS_DIR_LOG_INDEX_KEY:
 197                 printf("DIR_LOG_INDEX");
 198                 break;
 199         case BTRFS_XATTR_ITEM_KEY:
 200                 printf("XATTR_ITEM");
 201                 break;
 202         case BTRFS_ORPHAN_ITEM_KEY:
 203                 printf("ORPHAN_ITEM");
 204                 break;
 205         case BTRFS_ROOT_ITEM_KEY:
 206                 printf("ROOT_ITEM");
 207                 break;
 208         case BTRFS_ROOT_REF_KEY:
 209                 printf("ROOT_REF");
 210                 break;
 211         case BTRFS_ROOT_BACKREF_KEY:
 212                 printf("ROOT_BACKREF");
 213                 break;
 214         case BTRFS_EXTENT_ITEM_KEY:
 215                 printf("EXTENT_ITEM");
 216                 break;
 217         case BTRFS_EXTENT_REF_KEY:
 218                 printf("EXTENT_REF");
 219                 break;
 220         case BTRFS_CSUM_ITEM_KEY:
 221                 printf("CSUM_ITEM");
 222                 break;
 223         case BTRFS_EXTENT_CSUM_KEY:
 224                 printf("EXTENT_CSUM");
 225                 break;
 226         case BTRFS_EXTENT_DATA_KEY:
 227                 printf("EXTENT_DATA");
 228                 break;
 229         case BTRFS_BLOCK_GROUP_ITEM_KEY:
 230                 printf("BLOCK_GROUP_ITEM");
 231                 break;
 232         case BTRFS_CHUNK_ITEM_KEY:
 233                 printf("CHUNK_ITEM");
 234                 break;
 235         case BTRFS_DEV_ITEM_KEY:
 236                 printf("DEV_ITEM");
 237                 break;
 238         case BTRFS_DEV_EXTENT_KEY:
 239                 printf("DEV_EXTENT");
 240                 break;
 241         case BTRFS_STRING_ITEM_KEY:
 242                 printf("STRING_ITEM");
 243                 break;
 244         default:
 245                 printf("UNKNOWN");
 246         };
 247 }
 248
 249 static void print_objectid(unsigned long long objectid, u8 type)
 250 {
 251         if (type == BTRFS_DEV_EXTENT_KEY) {
 252                 printf("%llu", objectid); /* device id */
 253                 return;
 254         }
 255
 256         switch (objectid) {
 257         case BTRFS_ROOT_TREE_OBJECTID:
 258                 if (type == BTRFS_DEV_ITEM_KEY)
 259                         printf("DEV_ITEMS");
 260                 else
 261                         printf("ROOT_TREE");
 262                 break;
 263         case BTRFS_EXTENT_TREE_OBJECTID:
 264                 printf("EXTENT_TREE");
 265                 break;
 266         case BTRFS_CHUNK_TREE_OBJECTID:
 267                 printf("CHUNK_TREE");
 268                 break;
 269         case BTRFS_DEV_TREE_OBJECTID:
 270                 printf("DEV_TREE");
 271                 break;
 272         case BTRFS_FS_TREE_OBJECTID:
 273                 printf("FS_TREE");
 274                 break;
 275         case BTRFS_ROOT_TREE_DIR_OBJECTID:
 276                 printf("ROOT_TREE_DIR");
 277                 break;
 278         case BTRFS_CSUM_TREE_OBJECTID:
 279                 printf("CSUM_TREE");
 280                 break;
 281         case BTRFS_ORPHAN_OBJECTID:
 282                 printf("ORPHAN");
 283                 break;
 284         case BTRFS_TREE_LOG_OBJECTID:
 285                 printf("TREE_LOG");
 286                 break;
 287         case BTRFS_TREE_LOG_FIXUP_OBJECTID:
 288                 printf("LOG_FIXUP");
 289                 break;
 290         case BTRFS_TREE_RELOC_OBJECTID:
 291                 printf("TREE_RELOC");
 292                 break;
 293         case BTRFS_DATA_RELOC_TREE_OBJECTID:
 294                 printf("DATA_RELOC_TREE");
 295                 break;
 296         case BTRFS_EXTENT_CSUM_OBJECTID:
 297                 printf("EXTENT_CSUM");
 298                 break;
 299         case BTRFS_MULTIPLE_OBJECTIDS:
 300                 printf("MULTIPLE");
 301                 break;
 302         case BTRFS_FIRST_CHUNK_TREE_OBJECTID:
 303                 printf("FIRST_CHUNK_TREE");
 304                 break;
 305         default:
 306                 printf("%llu", objectid);
 307         }
 308 }
 309
 310 void btrfs_print_key(struct btrfs_disk_key *disk_key)
 311 {
 312         u8 type;
 313         printf("key (");
 314         type = btrfs_disk_key_type(disk_key);
 315         print_objectid((unsigned long long)btrfs_disk_key_objectid(disk_key),
 316                 type);
 317         printf(" ");
 318         print_key_type(type);
 319         printf(" %llu)", (unsigned long long)btrfs_disk_key_offset(disk_key));
 320 }
 321
 322 void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
 323 {
 324         int i;
 325         char *str;
 326         struct btrfs_item *item;
 327         struct btrfs_extent_item *ei;
 328         struct btrfs_root_item *ri;
 329         struct btrfs_dir_item *di;
 330         struct btrfs_inode_item *ii;
 331         struct btrfs_file_extent_item *fi;
 332         struct btrfs_csum_item *ci;
 333         struct btrfs_block_group_item *bi;
 334         struct btrfs_extent_ref *ref;
 335         struct btrfs_inode_ref *iref;
 336         struct btrfs_dev_extent *dev_extent;
 337         struct btrfs_disk_key disk_key;
 338         struct btrfs_root_item root_item;
 339         struct btrfs_block_group_item bg_item;
 340         struct btrfs_dir_log_item *dlog;
 341         u32 nr = btrfs_header_nritems(l);
 342         u32 type;
 343
 344         printf("leaf %llu items %d free space %d generation %llu owner %llu\n",
 345                 (unsigned long long)btrfs_header_bytenr(l), nr,
 346                 btrfs_leaf_free_space(root, l),
 347                 (unsigned long long)btrfs_header_generation(l),
 348                 (unsigned long long)btrfs_header_owner(l));
 349         print_uuids(l);
 350         fflush(stdout);
 351         for (i = 0 ; i < nr ; i++) {
 352                 item = btrfs_item_nr(l, i);
 353                 btrfs_item_key(l, &disk_key, i);
 354                 type = btrfs_disk_key_type(&disk_key);
 355                 printf("\titem %d ", i);
 356                 btrfs_print_key(&disk_key);
 357                 printf(" itemoff %d itemsize %d\n",
 358                         btrfs_item_offset(l, item),
 359                         btrfs_item_size(l, item));
 360                 switch (type) {
 361                 case BTRFS_INODE_ITEM_KEY:
 362                         ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
 363                         printf("\t\tinode generation %llu size %llu block group %llu mode %o links %u\n",
 364                                (unsigned long long)btrfs_inode_generation(l, ii),
 365                                (unsigned long long)btrfs_inode_size(l, ii),
 366                                (unsigned long long)btrfs_inode_block_group(l,ii),
 367                                btrfs_inode_mode(l, ii),
 368                                btrfs_inode_nlink(l, ii));
 369                         break;
 370                 case BTRFS_INODE_REF_KEY:
 371                         iref = btrfs_item_ptr(l, i, struct btrfs_inode_ref);
 372                         print_inode_ref_item(l, item, iref);
 373                         break;
 374                 case BTRFS_DIR_ITEM_KEY:
 375                 case BTRFS_DIR_INDEX_KEY:
 376                 case BTRFS_XATTR_ITEM_KEY:
 377                         di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
 378                         print_dir_item(l, item, di);
 379                         break;
 380                 case BTRFS_DIR_LOG_INDEX_KEY:
 381                 case BTRFS_DIR_LOG_ITEM_KEY:
 382                         dlog = btrfs_item_ptr(l, i, struct btrfs_dir_log_item);
 383                         printf("\t\tdir log end %Lu\n",
 384                                btrfs_dir_log_end(l, dlog));
 385                        break;
 386                 case BTRFS_ORPHAN_ITEM_KEY:
 387                         printf("\t\torphan item\n");
 388                         break;
 389                 case BTRFS_ROOT_ITEM_KEY:
 390                         ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
 391                         read_extent_buffer(l, &root_item, (unsigned long)ri, sizeof(root_item));
 392                         printf("\t\troot data bytenr %llu level %d dirid %llu refs %u\n",
 393                                 (unsigned long long)btrfs_root_bytenr(&root_item),
 394                                 btrfs_root_level(&root_item),
 395                                 (unsigned long long)btrfs_root_dirid(&root_item),
 396                                 btrfs_root_refs(&root_item));
 397                         if (btrfs_root_refs(&root_item) == 0) {
 398                                 struct btrfs_key drop_key;
 399                                 btrfs_disk_key_to_cpu(&drop_key,
 400                                                       &root_item.drop_progress);
 401                                 printf("\t\tdrop ");
 402                                 btrfs_print_key(&root_item.drop_progress);
 403                                 printf(" level %d\n", root_item.drop_level);
 404                         }
 405                         break;
 406                 case BTRFS_ROOT_REF_KEY:
 407                         print_root_ref(l, i, "ref");
 408                         break;
 409                 case BTRFS_ROOT_BACKREF_KEY:
 410                         print_root_ref(l, i, "backref");
 411                         break;
 412                 case BTRFS_EXTENT_ITEM_KEY:
 413                         ei = btrfs_item_ptr(l, i, struct btrfs_extent_item);
 414                         printf("\t\textent data refs %u\n",
 415                                 btrfs_extent_refs(l, ei));
 416                         break;
 417                 case BTRFS_EXTENT_REF_KEY:
 418                         ref = btrfs_item_ptr(l, i, struct btrfs_extent_ref);
 419                         printf("\t\textent back ref root %llu gen %llu "
 420                                "owner %llu num_refs %lu\n",
 421                                (unsigned long long)btrfs_ref_root(l, ref),
 422                                (unsigned long long)btrfs_ref_generation(l, ref),
 423                                (unsigned long long)btrfs_ref_objectid(l, ref),
 424                                (unsigned long)btrfs_ref_num_refs(l, ref));
 425                         break;
 426                 case BTRFS_CSUM_ITEM_KEY:
 427                         ci = btrfs_item_ptr(l, i, struct btrfs_csum_item);
 428                         printf("\t\tcsum item\n");
 429                         break;
 430                 case BTRFS_EXTENT_CSUM_KEY:
 431                         ci = btrfs_item_ptr(l, i, struct btrfs_csum_item);
 432                         printf("\t\textent csum item\n");
 433                         break;
 434                 case BTRFS_EXTENT_DATA_KEY:
 435                         fi = btrfs_item_ptr(l, i,
 436                                             struct btrfs_file_extent_item);
 437                         print_file_extent_item(l, item, fi);
 438                         break;
 439                 case BTRFS_BLOCK_GROUP_ITEM_KEY:
 440                         bi = btrfs_item_ptr(l, i,
 441                                             struct btrfs_block_group_item);
 442                         read_extent_buffer(l, &bg_item, (unsigned long)bi,
 443                                            sizeof(bg_item));
 444                         printf("\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
 445                                (unsigned long long)btrfs_block_group_used(&bg_item),
 446                                (unsigned long long)btrfs_block_group_chunk_objectid(&bg_item),
 447                                (unsigned long long)btrfs_block_group_flags(&bg_item));
 448                         break;
 449                 case BTRFS_CHUNK_ITEM_KEY:
 450                         print_chunk(l, btrfs_item_ptr(l, i, struct btrfs_chunk));
 451                         break;
 452                 case BTRFS_DEV_ITEM_KEY:
 453                         print_dev_item(l, btrfs_item_ptr(l, i,
 454                                         struct btrfs_dev_item));
 455                         break;
 456                 case BTRFS_DEV_EXTENT_KEY:
 457                         dev_extent = btrfs_item_ptr(l, i,
 458                                                     struct btrfs_dev_extent);
 459                         printf("\t\tdev extent chunk_tree %llu\n"
 460                                "\t\tchunk objectid %llu chunk offset %llu "
 461                                "length %llu\n",
 462                                (unsigned long long)
 463                                btrfs_dev_extent_chunk_tree(l, dev_extent),
 464                                (unsigned long long)
 465                                btrfs_dev_extent_chunk_objectid(l, dev_extent),
 466                                (unsigned long long)
 467                                btrfs_dev_extent_chunk_offset(l, dev_extent),
 468                                (unsigned long long)
 469                                btrfs_dev_extent_length(l, dev_extent));
 470                         break;
 471                 case BTRFS_STRING_ITEM_KEY:
 472                         /* dirty, but it's simple */
 473                         str = l->data + btrfs_item_ptr_offset(l, i);
 474                         printf("\t\titem data %.*s\n", btrfs_item_size(l, item), str);
 475                         break;
 476                 };
 477                 fflush(stdout);
 478         }
 479 }
 480
 481 void btrfs_print_tree(struct btrfs_root *root, struct extent_buffer *eb)
 482 {
 483         int i;
 484         u32 nr;
 485         u32 size;
 486         struct btrfs_disk_key disk_key;
 487         struct btrfs_key key;
 488
 489         if (!eb)
 490                 return;
 491         nr = btrfs_header_nritems(eb);
 492         if (btrfs_is_leaf(eb)) {
 493                 btrfs_print_leaf(root, eb);
 494                 return;
 495         }
 496         printf("node %llu level %d items %d free %u generation %llu owner %llu\n",
 497                (unsigned long long)eb->start,
 498                 btrfs_header_level(eb), nr,
 499                 (u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr,
 500                 (unsigned long long)btrfs_header_generation(eb),
 501                 (unsigned long long)btrfs_header_owner(eb));
 502         print_uuids(eb);
 503         fflush(stdout);
 504         size = btrfs_level_size(root, btrfs_header_level(eb) - 1);
 505         for (i = 0; i < nr; i++) {
 506                 u64 blocknr = btrfs_node_blockptr(eb, i);
 507                 btrfs_node_key(eb, &disk_key, i);
 508                 btrfs_disk_key_to_cpu(&key, &disk_key);
 509                 printf("\t");
 510                 btrfs_print_key(&disk_key);
 511                 printf(" block %llu (%llu) gen %llu\n",
 512                        (unsigned long long)blocknr,
 513                        (unsigned long long)blocknr / size,
 514                        (unsigned long long)btrfs_node_ptr_generation(eb, i));
 515                 fflush(stdout);
 516         }
 517         for (i = 0; i < nr; i++) {
 518                 struct extent_buffer *next = read_tree_block(root,
 519                                              btrfs_node_blockptr(eb, i),
 520                                              size,
 521                                              btrfs_node_ptr_generation(eb, i));
 522                 if (!next) {
 523                         fprintf(stderr, "failed to read %llu in tree %llu\n",
 524                                 (unsigned long long)btrfs_node_blockptr(eb, i),
 525                                 (unsigned long long)btrfs_header_owner(eb));
 526                         continue;
 527                 }
 528                 if (btrfs_is_leaf(next) &&
 529                     btrfs_header_level(eb) != 1)
 530                         BUG();
 531                 if (btrfs_header_level(next) !=
 532                         btrfs_header_level(eb) - 1)
 533                         BUG();
 534                 btrfs_print_tree(root, next);
 535                 free_extent_buffer(next);
 536         }
 537 }
 538