disk-io.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 #define _XOPEN_SOURCE 600
  20 #define __USE_XOPEN2K
  21 #define _GNU_SOURCE 1
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include "kerncompat.h"
  29 #include "radix-tree.h"
  30 #include "ctree.h"
  31 #include "disk-io.h"
  32 #include "volumes.h"
  33 #include "transaction.h"
  34 #include "crc32c.h"
  35 #include "utils.h"
  36
  37 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
  38 {
  39         if (buf->start != btrfs_header_bytenr(buf))
  40                 BUG();
  41
  42         if (memcmp_extent_buffer(buf, root->fs_info->fsid,
  43                                  (unsigned long)btrfs_header_fsid(buf),
  44                                  BTRFS_FSID_SIZE))
  45                 BUG();
  46         return 0;
  47 }
  48
  49 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  50 {
  51         return crc32c(seed, data, len);
  52 }
  53
  54 void btrfs_csum_final(u32 crc, char *result)
  55 {
  56         *(__le32 *)result = ~cpu_to_le32(crc);
  57 }
  58
  59 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
  60                            int verify)
  61 {
  62         char result[BTRFS_CRC32_SIZE];
  63         u32 len;
  64         u32 crc = ~(u32)0;
  65
  66         len = buf->len - BTRFS_CSUM_SIZE;
  67         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  68         btrfs_csum_final(crc, result);
  69
  70         if (verify) {
  71                 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
  72                         printk("checksum verify failed on %llu\n",
  73                                 (unsigned long long)buf->start);
  74                         return 1;
  75                 }
  76         } else {
  77                 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
  78         }
  79         return 0;
  80 }
  81
  82 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  83                                             u64 bytenr, u32 blocksize)
  84 {
  85         return find_extent_buffer(&root->fs_info->extent_cache,
  86                                   bytenr, blocksize);
  87 }
  88
  89 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  90                                                  u64 bytenr, u32 blocksize)
  91 {
  92         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
  93                                    blocksize);
  94 }
  95
  96 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
  97 {
  98         int ret;
  99         int total_devs = 1;
 100         int dev_nr;
 101         struct extent_buffer *eb;
 102         u64 physical;
 103         u64 length;
 104         struct btrfs_device *device;
 105
 106         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 107         if (eb && btrfs_buffer_uptodate(eb)) {
 108                 free_extent_buffer(eb);
 109                 return 0;
 110         }
 111
 112         dev_nr = 0;
 113         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, dev_nr,
 114                               bytenr, &physical, &length, &device,
 115                               &total_devs);
 116         BUG_ON(ret);
 117         device->total_ios++;
 118         blocksize = min(blocksize, (u32)(64 * 1024));
 119         readahead(device->fd, physical, blocksize);
 120         return 0;
 121 }
 122
 123 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 124                                      u32 blocksize)
 125 {
 126         int ret;
 127         int total_devs = 1;
 128         int dev_nr;
 129         struct extent_buffer *eb;
 130         u64 physical;
 131         u64 length;
 132         struct btrfs_device *device;
 133
 134         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 135         if (!eb)
 136                 return NULL;
 137
 138         if (btrfs_buffer_uptodate(eb))
 139                 return eb;
 140
 141         dev_nr = 0;
 142         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, dev_nr,
 143                               eb->start, &physical, &length, &device,
 144                               &total_devs);
 145         BUG_ON(ret);
 146         eb->fd = device->fd;
 147         device->total_ios++;
 148         eb->dev_bytenr = physical;
 149         ret = read_extent_from_disk(eb);
 150         if (ret) {
 151                 free_extent_buffer(eb);
 152                 return NULL;
 153         }
 154         btrfs_set_buffer_uptodate(eb);
 155         return eb;
 156 }
 157
 158 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 159                      struct extent_buffer *eb)
 160 {
 161         int ret;
 162         int total_devs = 1;
 163         int dev_nr;
 164         u64 physical;
 165         u64 length;
 166         struct btrfs_device *device;
 167
 168         if (check_tree_block(root, eb))
 169                 BUG();
 170         if (!btrfs_buffer_uptodate(eb))
 171                 BUG();
 172
 173         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 174         csum_tree_block(root, eb, 0);
 175
 176         dev_nr = 0;
 177         while(dev_nr < total_devs) {
 178                 ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 179                                       dev_nr, eb->start, &physical, &length,
 180                                       &device, &total_devs);
 181                 BUG_ON(ret);
 182                 eb->fd = device->fd;
 183                 eb->dev_bytenr = physical;
 184                 dev_nr++;
 185                 device->total_ios++;
 186                 ret = write_extent_to_disk(eb);
 187                 BUG_ON(ret);
 188         }
 189         return 0;
 190 }
 191
 192 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 193                         u32 stripesize, struct btrfs_root *root,
 194                         struct btrfs_fs_info *fs_info, u64 objectid)
 195 {
 196         root->node = NULL;
 197         root->commit_root = NULL;
 198         root->sectorsize = sectorsize;
 199         root->nodesize = nodesize;
 200         root->leafsize = leafsize;
 201         root->stripesize = stripesize;
 202         root->ref_cows = 0;
 203         root->track_dirty = 0;
 204
 205         root->fs_info = fs_info;
 206         root->objectid = objectid;
 207         root->last_trans = 0;
 208         root->highest_inode = 0;
 209         root->last_inode_alloc = 0;
 210
 211         INIT_LIST_HEAD(&root->dirty_list);
 212         memset(&root->root_key, 0, sizeof(root->root_key));
 213         memset(&root->root_item, 0, sizeof(root->root_item));
 214         root->root_key.objectid = objectid;
 215         return 0;
 216 }
 217
 218 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 219                                struct btrfs_root *root)
 220 {
 221         int ret;
 222         u64 old_root_bytenr;
 223         struct btrfs_root *tree_root = root->fs_info->tree_root;
 224
 225         btrfs_write_dirty_block_groups(trans, root);
 226         while(1) {
 227                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 228                 if (old_root_bytenr == root->node->start)
 229                         break;
 230                 btrfs_set_root_bytenr(&root->root_item,
 231                                        root->node->start);
 232                 root->root_item.level = btrfs_header_level(root->node);
 233                 ret = btrfs_update_root(trans, tree_root,
 234                                         &root->root_key,
 235                                         &root->root_item);
 236                 BUG_ON(ret);
 237                 btrfs_write_dirty_block_groups(trans, root);
 238         }
 239         return 0;
 240 }
 241
 242 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 243                              struct btrfs_fs_info *fs_info)
 244 {
 245         struct btrfs_root *root;
 246         struct list_head *next;
 247
 248         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 249                 next = fs_info->dirty_cowonly_roots.next;
 250                 list_del_init(next);
 251                 root = list_entry(next, struct btrfs_root, dirty_list);
 252                 update_cowonly_root(trans, root);
 253         }
 254         return 0;
 255 }
 256
 257 static int __commit_transaction(struct btrfs_trans_handle *trans,
 258                                 struct btrfs_root *root)
 259 {
 260         u64 start;
 261         u64 end;
 262         struct extent_buffer *eb;
 263         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 264         int ret;
 265
 266         while(1) {
 267                 ret = find_first_extent_bit(tree, 0, &start, &end,
 268                                             EXTENT_DIRTY);
 269                 if (ret)
 270                         break;
 271                 while(start <= end) {
 272                         eb = find_first_extent_buffer(tree, start);
 273                         BUG_ON(!eb || eb->start != start);
 274                         ret = write_tree_block(trans, root, eb);
 275                         BUG_ON(ret);
 276                         start += eb->len;
 277                         clear_extent_buffer_dirty(eb);
 278                         free_extent_buffer(eb);
 279                 }
 280         }
 281         return 0;
 282 }
 283
 284 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 285                              struct btrfs_root *root)
 286 {
 287         int ret = 0;
 288         struct btrfs_root *new_root = NULL;
 289         struct btrfs_fs_info *fs_info = root->fs_info;
 290
 291         if (root->commit_root == root->node)
 292                 goto commit_tree;
 293
 294         new_root = malloc(sizeof(*new_root));
 295         if (!new_root)
 296                 return -ENOMEM;
 297         memcpy(new_root, root, sizeof(*new_root));
 298         new_root->node = root->commit_root;
 299         root->commit_root = NULL;
 300
 301         root->root_key.offset = trans->transid;
 302         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 303         root->root_item.level = btrfs_header_level(root->node);
 304         ret = btrfs_insert_root(trans, fs_info->tree_root,
 305                                 &root->root_key, &root->root_item);
 306         BUG_ON(ret);
 307
 308         btrfs_set_root_refs(&new_root->root_item, 0);
 309         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 310                                 &new_root->root_key, &new_root->root_item);
 311         BUG_ON(ret);
 312
 313         ret = commit_tree_roots(trans, fs_info);
 314         BUG_ON(ret);
 315         ret = __commit_transaction(trans, root);
 316         BUG_ON(ret);
 317         write_ctree_super(trans, root);
 318         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 319                                    &fs_info->pinned_extents);
 320         btrfs_free_transaction(root, trans);
 321         fs_info->running_transaction = NULL;
 322
 323         trans = btrfs_start_transaction(root, 1);
 324         ret = btrfs_drop_snapshot(trans, new_root);
 325         BUG_ON(ret);
 326         ret = btrfs_del_root(trans, fs_info->tree_root, &new_root->root_key);
 327         BUG_ON(ret);
 328 commit_tree:
 329         ret = commit_tree_roots(trans, fs_info);
 330         BUG_ON(ret);
 331         ret = __commit_transaction(trans, root);
 332         BUG_ON(ret);
 333         write_ctree_super(trans, root);
 334         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 335                                    &fs_info->pinned_extents);
 336         btrfs_free_transaction(root, trans);
 337         free_extent_buffer(root->commit_root);
 338         root->commit_root = NULL;
 339         fs_info->running_transaction = NULL;
 340         if (new_root) {
 341                 free_extent_buffer(new_root->node);
 342                 free(new_root);
 343         }
 344         return 0;
 345 }
 346
 347 static int find_and_setup_root(struct btrfs_root *tree_root,
 348                                struct btrfs_fs_info *fs_info,
 349                                u64 objectid, struct btrfs_root *root)
 350 {
 351         int ret;
 352         u32 blocksize;
 353
 354         __setup_root(tree_root->nodesize, tree_root->leafsize,
 355                      tree_root->sectorsize, tree_root->stripesize,
 356                      root, fs_info, objectid);
 357         ret = btrfs_find_last_root(tree_root, objectid,
 358                                    &root->root_item, &root->root_key);
 359         BUG_ON(ret);
 360
 361         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 362         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 363                                      blocksize);
 364         BUG_ON(!root->node);
 365         return 0;
 366 }
 367
 368 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 369 {
 370         if (root->node)
 371                 free_extent_buffer(root->node);
 372         if (root->commit_root)
 373                 free_extent_buffer(root->commit_root);
 374
 375         free(root);
 376         return 0;
 377 }
 378
 379 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 380                                       struct btrfs_key *location)
 381 {
 382         struct btrfs_root *root;
 383         struct btrfs_root *tree_root = fs_info->tree_root;
 384         struct btrfs_path *path;
 385         struct extent_buffer *l;
 386         u32 blocksize;
 387         int ret = 0;
 388
 389         root = malloc(sizeof(*root));
 390         if (!root)
 391                 return ERR_PTR(-ENOMEM);
 392         memset(root, 0, sizeof(*root));
 393         if (location->offset == (u64)-1) {
 394                 ret = find_and_setup_root(tree_root, fs_info,
 395                                           location->objectid, root);
 396                 if (ret) {
 397                         free(root);
 398                         return ERR_PTR(ret);
 399                 }
 400                 goto insert;
 401         }
 402
 403         __setup_root(tree_root->nodesize, tree_root->leafsize,
 404                      tree_root->sectorsize, tree_root->stripesize,
 405                      root, fs_info, location->objectid);
 406
 407         path = btrfs_alloc_path();
 408         BUG_ON(!path);
 409         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 410         if (ret != 0) {
 411                 if (ret > 0)
 412                         ret = -ENOENT;
 413                 goto out;
 414         }
 415         l = path->nodes[0];
 416         read_extent_buffer(l, &root->root_item,
 417                btrfs_item_ptr_offset(l, path->slots[0]),
 418                sizeof(root->root_item));
 419         memcpy(&root->root_key, location, sizeof(*location));
 420         ret = 0;
 421 out:
 422         btrfs_release_path(root, path);
 423         btrfs_free_path(path);
 424         if (ret) {
 425                 free(root);
 426                 return ERR_PTR(ret);
 427         }
 428         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 429         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 430                                      blocksize);
 431         BUG_ON(!root->node);
 432 insert:
 433         root->ref_cows = 1;
 434         return root;
 435 }
 436
 437 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr)
 438 {
 439         int fp;
 440
 441         fp = open(filename, O_CREAT | O_RDWR, 0600);
 442         if (fp < 0) {
 443                 return NULL;
 444         }
 445         return open_ctree_fd(fp, filename, sb_bytenr);
 446 }
 447
 448 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr)
 449 {
 450         u32 sectorsize;
 451         u32 nodesize;
 452         u32 leafsize;
 453         u32 blocksize;
 454         u32 stripesize;
 455         struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
 456         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 457         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 458         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 459         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 460         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 461         int ret;
 462         struct btrfs_super_block *disk_super;
 463         struct btrfs_fs_devices *fs_devices = NULL;
 464         u64 total_devs;
 465
 466         if (sb_bytenr == 0)
 467                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 468
 469         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 470                                     &total_devs, sb_bytenr);
 471
 472         if (ret) {
 473                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 474                 return NULL;
 475         }
 476         fprintf(stderr, "found Btrfs on %s with %lu devices\n", path,
 477                 (unsigned long)total_devs);
 478
 479         if (total_devs != 1) {
 480                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 481                 BUG_ON(ret);
 482         }
 483
 484         fs_info->fp = fs_devices->lowest_bdev;
 485         fs_info->running_transaction = NULL;
 486         fs_info->fs_root = root;
 487         fs_info->tree_root = tree_root;
 488         fs_info->extent_root = extent_root;
 489         fs_info->extent_ops = NULL;
 490         fs_info->priv_data = NULL;
 491         fs_info->chunk_root = chunk_root;
 492         fs_info->dev_root = dev_root;
 493         fs_info->force_system_allocs = 0;
 494
 495         extent_io_tree_init(&fs_info->extent_cache);
 496         extent_io_tree_init(&fs_info->free_space_cache);
 497         extent_io_tree_init(&fs_info->block_group_cache);
 498         extent_io_tree_init(&fs_info->pinned_extents);
 499         extent_io_tree_init(&fs_info->pending_del);
 500         extent_io_tree_init(&fs_info->extent_ins);
 501
 502         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 503
 504         mutex_init(&fs_info->fs_mutex);
 505         fs_info->fs_devices = fs_devices;
 506         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 507         INIT_LIST_HEAD(&fs_info->space_info);
 508
 509         __setup_root(4096, 4096, 4096, 4096, tree_root,
 510                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 511
 512         ret = btrfs_open_devices(fs_devices, O_RDWR);
 513         BUG_ON(ret);
 514
 515         fs_info->sb_buffer = btrfs_find_create_tree_block(tree_root, sb_bytenr,
 516                                                           4096);
 517         BUG_ON(!fs_info->sb_buffer);
 518         fs_info->sb_buffer->fd = fs_devices->lowest_bdev;
 519         fs_info->sb_buffer->dev_bytenr = sb_bytenr;
 520         ret = read_extent_from_disk(fs_info->sb_buffer);
 521         BUG_ON(ret);
 522         btrfs_set_buffer_uptodate(fs_info->sb_buffer);
 523
 524         read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
 525                            sizeof(fs_info->super_copy));
 526         read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
 527                            (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
 528                            BTRFS_FSID_SIZE);
 529
 530         disk_super = &fs_info->super_copy;
 531         if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
 532                     sizeof(disk_super->magic))) {
 533                 printk("No valid btrfs found\n");
 534                 BUG_ON(1);
 535         }
 536         nodesize = btrfs_super_nodesize(disk_super);
 537         leafsize = btrfs_super_leafsize(disk_super);
 538         sectorsize = btrfs_super_sectorsize(disk_super);
 539         stripesize = btrfs_super_stripesize(disk_super);
 540         tree_root->nodesize = nodesize;
 541         tree_root->leafsize = leafsize;
 542         tree_root->sectorsize = sectorsize;
 543         tree_root->stripesize = stripesize;
 544
 545         ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
 546         BUG_ON(ret);
 547         ret = btrfs_read_sys_array(tree_root);
 548         BUG_ON(ret);
 549         blocksize = btrfs_level_size(tree_root,
 550                                      btrfs_super_chunk_root_level(disk_super));
 551
 552         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 553                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 554
 555         chunk_root->node = read_tree_block(chunk_root,
 556                                            btrfs_super_chunk_root(disk_super),
 557                                            blocksize);
 558
 559         BUG_ON(!chunk_root->node);
 560
 561         ret = btrfs_read_chunk_tree(chunk_root);
 562         BUG_ON(ret);
 563
 564         blocksize = btrfs_level_size(tree_root,
 565                                      btrfs_super_root_level(disk_super));
 566
 567         tree_root->node = read_tree_block(tree_root,
 568                                           btrfs_super_root(disk_super),
 569                                           blocksize);
 570         BUG_ON(!tree_root->node);
 571         ret = find_and_setup_root(tree_root, fs_info,
 572                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 573         BUG_ON(ret);
 574         extent_root->track_dirty = 1;
 575
 576         ret = find_and_setup_root(tree_root, fs_info,
 577                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 578         BUG_ON(ret);
 579         dev_root->track_dirty = 1;
 580
 581         ret = find_and_setup_root(tree_root, fs_info,
 582                                   BTRFS_FS_TREE_OBJECTID, root);
 583         BUG_ON(ret);
 584         root->ref_cows = 1;
 585         fs_info->generation = btrfs_super_generation(disk_super) + 1;
 586         btrfs_read_block_groups(root);
 587         return root;
 588 }
 589
 590 int write_ctree_super(struct btrfs_trans_handle *trans,
 591                       struct btrfs_root *root)
 592 {
 593         int ret;
 594         struct btrfs_root *tree_root = root->fs_info->tree_root;
 595         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
 596         btrfs_set_super_generation(&root->fs_info->super_copy,
 597                                    trans->transid);
 598         btrfs_set_super_root(&root->fs_info->super_copy,
 599                              tree_root->node->start);
 600         btrfs_set_super_root_level(&root->fs_info->super_copy,
 601                                    btrfs_header_level(tree_root->node));
 602         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
 603                                    chunk_root->node->start);
 604         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
 605                                          btrfs_header_level(chunk_root->node));
 606         write_extent_buffer(root->fs_info->sb_buffer,
 607                             &root->fs_info->super_copy, 0,
 608                             sizeof(root->fs_info->super_copy));
 609         ret = write_tree_block(trans, root, root->fs_info->sb_buffer);
 610         if (ret)
 611                 fprintf(stderr, "failed to write new super block err %d\n", ret);
 612         return ret;
 613 }
 614
 615 static int close_all_devices(struct btrfs_fs_info *fs_info)
 616 {
 617         struct list_head *list;
 618         struct list_head *next;
 619         struct btrfs_device *device;
 620
 621         return 0;
 622
 623         list = &fs_info->fs_devices->devices;
 624         list_for_each(next, list) {
 625                 device = list_entry(next, struct btrfs_device, dev_list);
 626                 // close(device->fd);
 627         }
 628         return 0;
 629 }
 630
 631 int close_ctree(struct btrfs_root *root)
 632 {
 633         int ret;
 634         struct btrfs_trans_handle *trans;
 635         struct btrfs_fs_info *fs_info = root->fs_info;
 636
 637         trans = btrfs_start_transaction(root, 1);
 638         btrfs_commit_transaction(trans, root);
 639         trans = btrfs_start_transaction(root, 1);
 640         ret = commit_tree_roots(trans, root->fs_info);
 641         BUG_ON(ret);
 642         ret = __commit_transaction(trans, root);
 643         BUG_ON(ret);
 644         write_ctree_super(trans, root);
 645         btrfs_free_transaction(root, trans);
 646         btrfs_free_block_groups(root->fs_info);
 647         close(root->fs_info->fp);
 648         if (root->node)
 649                 free_extent_buffer(root->node);
 650         if (root->fs_info->extent_root->node)
 651                 free_extent_buffer(root->fs_info->extent_root->node);
 652         if (root->fs_info->tree_root->node)
 653                 free_extent_buffer(root->fs_info->tree_root->node);
 654         free_extent_buffer(root->commit_root);
 655         free_extent_buffer(root->fs_info->sb_buffer);
 656
 657         if (root->fs_info->chunk_root->node);
 658                 free_extent_buffer(root->fs_info->chunk_root->node);
 659
 660         if (root->fs_info->dev_root->node);
 661                 free_extent_buffer(root->fs_info->dev_root->node);
 662
 663         close_all_devices(root->fs_info);
 664         extent_io_tree_cleanup(&fs_info->extent_cache);
 665         extent_io_tree_cleanup(&fs_info->free_space_cache);
 666         extent_io_tree_cleanup(&fs_info->block_group_cache);
 667         extent_io_tree_cleanup(&fs_info->pinned_extents);
 668         extent_io_tree_cleanup(&fs_info->pending_del);
 669         extent_io_tree_cleanup(&fs_info->extent_ins);
 670
 671         free(fs_info->tree_root);
 672         free(fs_info->extent_root);
 673         free(fs_info->fs_root);
 674         free(fs_info->chunk_root);
 675         free(fs_info->dev_root);
 676         free(fs_info);
 677
 678         return 0;
 679 }
 680
 681 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 682                      struct extent_buffer *eb)
 683 {
 684         return clear_extent_buffer_dirty(eb);
 685 }
 686
 687 int wait_on_tree_block_writeback(struct btrfs_root *root,
 688                                  struct extent_buffer *eb)
 689 {
 690         return 0;
 691 }
 692
 693 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
 694 {
 695         set_extent_buffer_dirty(eb);
 696 }
 697
 698 int btrfs_buffer_uptodate(struct extent_buffer *eb)
 699 {
 700         return extent_buffer_uptodate(eb);
 701 }
 702
 703 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
 704 {
 705         return set_extent_buffer_uptodate(eb);
 706 }