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 #include "print-tree.h"
  37
  38 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
  39 {
  40         if (buf->start != btrfs_header_bytenr(buf))
  41                 BUG();
  42
  43         if (memcmp_extent_buffer(buf, root->fs_info->fsid,
  44                                  (unsigned long)btrfs_header_fsid(buf),
  45                                  BTRFS_FSID_SIZE))
  46                 BUG();
  47         return 0;
  48 }
  49
  50 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  51 {
  52         return crc32c(seed, data, len);
  53 }
  54
  55 void btrfs_csum_final(u32 crc, char *result)
  56 {
  57         *(__le32 *)result = ~cpu_to_le32(crc);
  58 }
  59
  60 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
  61                            int verify)
  62 {
  63         char result[BTRFS_CRC32_SIZE];
  64         u32 len;
  65         u32 crc = ~(u32)0;
  66
  67         len = buf->len - BTRFS_CSUM_SIZE;
  68         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  69         btrfs_csum_final(crc, result);
  70
  71         if (verify) {
  72                 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
  73                         printk("checksum verify failed on %llu\n",
  74                                 (unsigned long long)buf->start);
  75                         return 1;
  76                 }
  77         } else {
  78                 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
  79         }
  80         return 0;
  81 }
  82
  83 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  84                                             u64 bytenr, u32 blocksize)
  85 {
  86         return find_extent_buffer(&root->fs_info->extent_cache,
  87                                   bytenr, blocksize);
  88 }
  89
  90 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  91                                                  u64 bytenr, u32 blocksize)
  92 {
  93         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
  94                                    blocksize);
  95 }
  96
  97 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
  98 {
  99         int ret;
 100         int total_devs = 1;
 101         int dev_nr;
 102         struct extent_buffer *eb;
 103         u64 physical;
 104         u64 length;
 105         struct btrfs_device *device;
 106
 107         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 108         if (eb && btrfs_buffer_uptodate(eb)) {
 109                 free_extent_buffer(eb);
 110                 return 0;
 111         }
 112
 113         dev_nr = 0;
 114         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, dev_nr,
 115                               bytenr, &physical, &length, &device,
 116                               &total_devs);
 117         BUG_ON(ret);
 118         device->total_ios++;
 119         blocksize = min(blocksize, (u32)(64 * 1024));
 120         readahead(device->fd, physical, blocksize);
 121         return 0;
 122 }
 123
 124 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 125                                      u32 blocksize)
 126 {
 127         int ret;
 128         int total_devs = 1;
 129         int dev_nr;
 130         struct extent_buffer *eb;
 131         u64 physical;
 132         u64 length;
 133         struct btrfs_device *device;
 134
 135         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 136         if (!eb)
 137                 return NULL;
 138
 139         if (btrfs_buffer_uptodate(eb))
 140                 return eb;
 141
 142         dev_nr = 0;
 143         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, dev_nr,
 144                               eb->start, &physical, &length, &device,
 145                               &total_devs);
 146         BUG_ON(ret);
 147         eb->fd = device->fd;
 148         device->total_ios++;
 149         eb->dev_bytenr = physical;
 150         ret = read_extent_from_disk(eb);
 151         if (ret) {
 152                 free_extent_buffer(eb);
 153                 return NULL;
 154         }
 155         btrfs_set_buffer_uptodate(eb);
 156         return eb;
 157 }
 158
 159 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 160                      struct extent_buffer *eb)
 161 {
 162         int ret;
 163         int total_devs = 1;
 164         int dev_nr;
 165         u64 physical;
 166         u64 length;
 167         struct btrfs_device *device;
 168
 169         if (check_tree_block(root, eb))
 170                 BUG();
 171         if (!btrfs_buffer_uptodate(eb))
 172                 BUG();
 173
 174         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 175         csum_tree_block(root, eb, 0);
 176
 177         dev_nr = 0;
 178         while(dev_nr < total_devs) {
 179                 ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 180                                       dev_nr, eb->start, &physical, &length,
 181                                       &device, &total_devs);
 182                 BUG_ON(ret);
 183                 eb->fd = device->fd;
 184                 eb->dev_bytenr = physical;
 185                 dev_nr++;
 186                 device->total_ios++;
 187                 ret = write_extent_to_disk(eb);
 188                 BUG_ON(ret);
 189         }
 190         return 0;
 191 }
 192
 193 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 194                         u32 stripesize, struct btrfs_root *root,
 195                         struct btrfs_fs_info *fs_info, u64 objectid)
 196 {
 197         root->node = NULL;
 198         root->commit_root = NULL;
 199         root->sectorsize = sectorsize;
 200         root->nodesize = nodesize;
 201         root->leafsize = leafsize;
 202         root->stripesize = stripesize;
 203         root->ref_cows = 0;
 204         root->track_dirty = 0;
 205
 206         root->fs_info = fs_info;
 207         root->objectid = objectid;
 208         root->last_trans = 0;
 209         root->highest_inode = 0;
 210         root->last_inode_alloc = 0;
 211
 212         INIT_LIST_HEAD(&root->dirty_list);
 213         memset(&root->root_key, 0, sizeof(root->root_key));
 214         memset(&root->root_item, 0, sizeof(root->root_item));
 215         root->root_key.objectid = objectid;
 216         return 0;
 217 }
 218
 219 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 220                                struct btrfs_root *root)
 221 {
 222         int ret;
 223         u64 old_root_bytenr;
 224         struct btrfs_root *tree_root = root->fs_info->tree_root;
 225
 226         btrfs_write_dirty_block_groups(trans, root);
 227         while(1) {
 228                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 229                 if (old_root_bytenr == root->node->start)
 230                         break;
 231                 btrfs_set_root_bytenr(&root->root_item,
 232                                        root->node->start);
 233                 root->root_item.level = btrfs_header_level(root->node);
 234                 ret = btrfs_update_root(trans, tree_root,
 235                                         &root->root_key,
 236                                         &root->root_item);
 237                 BUG_ON(ret);
 238                 btrfs_write_dirty_block_groups(trans, root);
 239         }
 240         return 0;
 241 }
 242
 243 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 244                              struct btrfs_fs_info *fs_info)
 245 {
 246         struct btrfs_root *root;
 247         struct list_head *next;
 248
 249         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 250                 next = fs_info->dirty_cowonly_roots.next;
 251                 list_del_init(next);
 252                 root = list_entry(next, struct btrfs_root, dirty_list);
 253                 update_cowonly_root(trans, root);
 254         }
 255         return 0;
 256 }
 257
 258 static int __commit_transaction(struct btrfs_trans_handle *trans,
 259                                 struct btrfs_root *root)
 260 {
 261         u64 start;
 262         u64 end;
 263         struct extent_buffer *eb;
 264         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 265         int ret;
 266
 267         while(1) {
 268                 ret = find_first_extent_bit(tree, 0, &start, &end,
 269                                             EXTENT_DIRTY);
 270                 if (ret)
 271                         break;
 272                 while(start <= end) {
 273                         eb = find_first_extent_buffer(tree, start);
 274                         BUG_ON(!eb || eb->start != start);
 275                         ret = write_tree_block(trans, root, eb);
 276                         BUG_ON(ret);
 277                         start += eb->len;
 278                         clear_extent_buffer_dirty(eb);
 279                         free_extent_buffer(eb);
 280                 }
 281         }
 282         return 0;
 283 }
 284
 285 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 286                              struct btrfs_root *root)
 287 {
 288         int ret = 0;
 289         struct btrfs_root *new_root = NULL;
 290         struct btrfs_fs_info *fs_info = root->fs_info;
 291
 292         if (root->commit_root == root->node)
 293                 goto commit_tree;
 294
 295         new_root = malloc(sizeof(*new_root));
 296         if (!new_root)
 297                 return -ENOMEM;
 298         memcpy(new_root, root, sizeof(*new_root));
 299         new_root->node = root->commit_root;
 300         root->commit_root = NULL;
 301
 302         root->root_key.offset = trans->transid;
 303         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 304         root->root_item.level = btrfs_header_level(root->node);
 305         ret = btrfs_insert_root(trans, fs_info->tree_root,
 306                                 &root->root_key, &root->root_item);
 307         BUG_ON(ret);
 308
 309         btrfs_set_root_refs(&new_root->root_item, 0);
 310         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 311                                 &new_root->root_key, &new_root->root_item);
 312         BUG_ON(ret);
 313
 314         ret = commit_tree_roots(trans, fs_info);
 315         BUG_ON(ret);
 316         ret = __commit_transaction(trans, root);
 317         BUG_ON(ret);
 318         write_ctree_super(trans, root);
 319         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 320                                    &fs_info->pinned_extents);
 321         btrfs_free_transaction(root, trans);
 322         fs_info->running_transaction = NULL;
 323
 324         trans = btrfs_start_transaction(root, 1);
 325         ret = btrfs_drop_snapshot(trans, new_root);
 326         BUG_ON(ret);
 327         ret = btrfs_del_root(trans, fs_info->tree_root, &new_root->root_key);
 328         BUG_ON(ret);
 329 commit_tree:
 330         ret = commit_tree_roots(trans, fs_info);
 331         BUG_ON(ret);
 332         ret = __commit_transaction(trans, root);
 333         BUG_ON(ret);
 334         write_ctree_super(trans, root);
 335         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 336                                    &fs_info->pinned_extents);
 337         btrfs_free_transaction(root, trans);
 338         free_extent_buffer(root->commit_root);
 339         root->commit_root = NULL;
 340         fs_info->running_transaction = NULL;
 341         if (new_root) {
 342                 free_extent_buffer(new_root->node);
 343                 free(new_root);
 344         }
 345         return 0;
 346 }
 347
 348 static int find_and_setup_root(struct btrfs_root *tree_root,
 349                                struct btrfs_fs_info *fs_info,
 350                                u64 objectid, struct btrfs_root *root)
 351 {
 352         int ret;
 353         u32 blocksize;
 354
 355         __setup_root(tree_root->nodesize, tree_root->leafsize,
 356                      tree_root->sectorsize, tree_root->stripesize,
 357                      root, fs_info, objectid);
 358         ret = btrfs_find_last_root(tree_root, objectid,
 359                                    &root->root_item, &root->root_key);
 360         BUG_ON(ret);
 361
 362         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 363         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 364                                      blocksize);
 365         BUG_ON(!root->node);
 366         return 0;
 367 }
 368
 369 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 370 {
 371         if (root->node)
 372                 free_extent_buffer(root->node);
 373         if (root->commit_root)
 374                 free_extent_buffer(root->commit_root);
 375
 376         free(root);
 377         return 0;
 378 }
 379
 380 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 381                                       struct btrfs_key *location)
 382 {
 383         struct btrfs_root *root;
 384         struct btrfs_root *tree_root = fs_info->tree_root;
 385         struct btrfs_path *path;
 386         struct extent_buffer *l;
 387         u32 blocksize;
 388         int ret = 0;
 389
 390         root = malloc(sizeof(*root));
 391         if (!root)
 392                 return ERR_PTR(-ENOMEM);
 393         memset(root, 0, sizeof(*root));
 394         if (location->offset == (u64)-1) {
 395                 ret = find_and_setup_root(tree_root, fs_info,
 396                                           location->objectid, root);
 397                 if (ret) {
 398                         free(root);
 399                         return ERR_PTR(ret);
 400                 }
 401                 goto insert;
 402         }
 403
 404         __setup_root(tree_root->nodesize, tree_root->leafsize,
 405                      tree_root->sectorsize, tree_root->stripesize,
 406                      root, fs_info, location->objectid);
 407
 408         path = btrfs_alloc_path();
 409         BUG_ON(!path);
 410         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 411         if (ret != 0) {
 412                 if (ret > 0)
 413                         ret = -ENOENT;
 414                 goto out;
 415         }
 416         l = path->nodes[0];
 417         read_extent_buffer(l, &root->root_item,
 418                btrfs_item_ptr_offset(l, path->slots[0]),
 419                sizeof(root->root_item));
 420         memcpy(&root->root_key, location, sizeof(*location));
 421         ret = 0;
 422 out:
 423         btrfs_release_path(root, path);
 424         btrfs_free_path(path);
 425         if (ret) {
 426                 free(root);
 427                 return ERR_PTR(ret);
 428         }
 429         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 430         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 431                                      blocksize);
 432         BUG_ON(!root->node);
 433 insert:
 434         root->ref_cows = 1;
 435         return root;
 436 }
 437
 438 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr)
 439 {
 440         int fp;
 441
 442         fp = open(filename, O_CREAT | O_RDWR, 0600);
 443         if (fp < 0) {
 444                 return NULL;
 445         }
 446         return open_ctree_fd(fp, filename, sb_bytenr);
 447 }
 448
 449 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr)
 450 {
 451         u32 sectorsize;
 452         u32 nodesize;
 453         u32 leafsize;
 454         u32 blocksize;
 455         u32 stripesize;
 456         struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
 457         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 458         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 459         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 460         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 461         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 462         int ret;
 463         struct btrfs_super_block *disk_super;
 464         struct btrfs_fs_devices *fs_devices = NULL;
 465         u64 total_devs;
 466
 467         if (sb_bytenr == 0)
 468                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 469
 470         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 471                                     &total_devs, sb_bytenr);
 472
 473         if (ret) {
 474                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 475                 return NULL;
 476         }
 477         fprintf(stderr, "found Btrfs on %s with %lu devices\n", path,
 478                 (unsigned long)total_devs);
 479
 480         if (total_devs != 1) {
 481                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 482                 BUG_ON(ret);
 483         }
 484
 485         memset(fs_info, 0, sizeof(*fs_info));
 486         fs_info->fp = fs_devices->lowest_bdev;
 487         fs_info->fs_root = root;
 488         fs_info->tree_root = tree_root;
 489         fs_info->extent_root = extent_root;
 490         fs_info->chunk_root = chunk_root;
 491         fs_info->dev_root = dev_root;
 492
 493         extent_io_tree_init(&fs_info->extent_cache);
 494         extent_io_tree_init(&fs_info->free_space_cache);
 495         extent_io_tree_init(&fs_info->block_group_cache);
 496         extent_io_tree_init(&fs_info->pinned_extents);
 497         extent_io_tree_init(&fs_info->pending_del);
 498         extent_io_tree_init(&fs_info->extent_ins);
 499
 500         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 501
 502         mutex_init(&fs_info->fs_mutex);
 503         fs_info->fs_devices = fs_devices;
 504         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 505         INIT_LIST_HEAD(&fs_info->space_info);
 506
 507         __setup_root(4096, 4096, 4096, 4096, tree_root,
 508                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 509
 510         ret = btrfs_open_devices(fs_devices, O_RDWR);
 511         BUG_ON(ret);
 512
 513         fs_info->sb_buffer = btrfs_find_create_tree_block(tree_root, sb_bytenr,
 514                                                           4096);
 515         BUG_ON(!fs_info->sb_buffer);
 516         fs_info->sb_buffer->fd = fs_devices->lowest_bdev;
 517         fs_info->sb_buffer->dev_bytenr = sb_bytenr;
 518         ret = read_extent_from_disk(fs_info->sb_buffer);
 519         BUG_ON(ret);
 520         btrfs_set_buffer_uptodate(fs_info->sb_buffer);
 521
 522         read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
 523                            sizeof(fs_info->super_copy));
 524         read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
 525                            (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
 526                            BTRFS_FSID_SIZE);
 527
 528         disk_super = &fs_info->super_copy;
 529         if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
 530                     sizeof(disk_super->magic))) {
 531                 printk("No valid btrfs found\n");
 532                 BUG_ON(1);
 533         }
 534         nodesize = btrfs_super_nodesize(disk_super);
 535         leafsize = btrfs_super_leafsize(disk_super);
 536         sectorsize = btrfs_super_sectorsize(disk_super);
 537         stripesize = btrfs_super_stripesize(disk_super);
 538         tree_root->nodesize = nodesize;
 539         tree_root->leafsize = leafsize;
 540         tree_root->sectorsize = sectorsize;
 541         tree_root->stripesize = stripesize;
 542
 543         ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
 544         BUG_ON(ret);
 545         ret = btrfs_read_sys_array(tree_root);
 546         BUG_ON(ret);
 547         blocksize = btrfs_level_size(tree_root,
 548                                      btrfs_super_chunk_root_level(disk_super));
 549
 550         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 551                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 552
 553         chunk_root->node = read_tree_block(chunk_root,
 554                                            btrfs_super_chunk_root(disk_super),
 555                                            blocksize);
 556
 557         BUG_ON(!chunk_root->node);
 558
 559         ret = btrfs_read_chunk_tree(chunk_root);
 560         BUG_ON(ret);
 561
 562         blocksize = btrfs_level_size(tree_root,
 563                                      btrfs_super_root_level(disk_super));
 564
 565         tree_root->node = read_tree_block(tree_root,
 566                                           btrfs_super_root(disk_super),
 567                                           blocksize);
 568         BUG_ON(!tree_root->node);
 569         ret = find_and_setup_root(tree_root, fs_info,
 570                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 571         BUG_ON(ret);
 572         extent_root->track_dirty = 1;
 573
 574         ret = find_and_setup_root(tree_root, fs_info,
 575                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 576         BUG_ON(ret);
 577         dev_root->track_dirty = 1;
 578
 579         ret = find_and_setup_root(tree_root, fs_info,
 580                                   BTRFS_FS_TREE_OBJECTID, root);
 581         BUG_ON(ret);
 582         root->ref_cows = 1;
 583         fs_info->generation = btrfs_super_generation(disk_super) + 1;
 584         btrfs_read_block_groups(root);
 585
 586         fs_info->data_alloc_profile = (u64)-1;
 587         fs_info->metadata_alloc_profile = (u64)-1;
 588         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 589
 590         return root;
 591 }
 592
 593 int write_ctree_super(struct btrfs_trans_handle *trans,
 594                       struct btrfs_root *root)
 595 {
 596         int ret;
 597         struct btrfs_root *tree_root = root->fs_info->tree_root;
 598         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
 599         btrfs_set_super_generation(&root->fs_info->super_copy,
 600                                    trans->transid);
 601         btrfs_set_super_root(&root->fs_info->super_copy,
 602                              tree_root->node->start);
 603         btrfs_set_super_root_level(&root->fs_info->super_copy,
 604                                    btrfs_header_level(tree_root->node));
 605         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
 606                                    chunk_root->node->start);
 607         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
 608                                          btrfs_header_level(chunk_root->node));
 609         write_extent_buffer(root->fs_info->sb_buffer,
 610                             &root->fs_info->super_copy, 0,
 611                             sizeof(root->fs_info->super_copy));
 612         ret = write_tree_block(trans, root, root->fs_info->sb_buffer);
 613         if (ret)
 614                 fprintf(stderr, "failed to write new super block err %d\n", ret);
 615         return ret;
 616 }
 617
 618 static int close_all_devices(struct btrfs_fs_info *fs_info)
 619 {
 620         struct list_head *list;
 621         struct list_head *next;
 622         struct btrfs_device *device;
 623
 624         return 0;
 625
 626         list = &fs_info->fs_devices->devices;
 627         list_for_each(next, list) {
 628                 device = list_entry(next, struct btrfs_device, dev_list);
 629                 // close(device->fd);
 630         }
 631         return 0;
 632 }
 633
 634 int close_ctree(struct btrfs_root *root)
 635 {
 636         int ret;
 637         struct btrfs_trans_handle *trans;
 638         struct btrfs_fs_info *fs_info = root->fs_info;
 639
 640         trans = btrfs_start_transaction(root, 1);
 641         btrfs_commit_transaction(trans, root);
 642         trans = btrfs_start_transaction(root, 1);
 643         ret = commit_tree_roots(trans, root->fs_info);
 644         BUG_ON(ret);
 645         ret = __commit_transaction(trans, root);
 646         BUG_ON(ret);
 647         write_ctree_super(trans, root);
 648         btrfs_free_transaction(root, trans);
 649         btrfs_free_block_groups(root->fs_info);
 650         close(root->fs_info->fp);
 651         if (root->node)
 652                 free_extent_buffer(root->node);
 653         if (root->fs_info->extent_root->node)
 654                 free_extent_buffer(root->fs_info->extent_root->node);
 655         if (root->fs_info->tree_root->node)
 656                 free_extent_buffer(root->fs_info->tree_root->node);
 657         free_extent_buffer(root->commit_root);
 658         free_extent_buffer(root->fs_info->sb_buffer);
 659
 660         if (root->fs_info->chunk_root->node);
 661                 free_extent_buffer(root->fs_info->chunk_root->node);
 662
 663         if (root->fs_info->dev_root->node);
 664                 free_extent_buffer(root->fs_info->dev_root->node);
 665
 666         close_all_devices(root->fs_info);
 667         extent_io_tree_cleanup(&fs_info->extent_cache);
 668         extent_io_tree_cleanup(&fs_info->free_space_cache);
 669         extent_io_tree_cleanup(&fs_info->block_group_cache);
 670         extent_io_tree_cleanup(&fs_info->pinned_extents);
 671         extent_io_tree_cleanup(&fs_info->pending_del);
 672         extent_io_tree_cleanup(&fs_info->extent_ins);
 673
 674         free(fs_info->tree_root);
 675         free(fs_info->extent_root);
 676         free(fs_info->fs_root);
 677         free(fs_info->chunk_root);
 678         free(fs_info->dev_root);
 679         free(fs_info);
 680
 681         return 0;
 682 }
 683
 684 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 685                      struct extent_buffer *eb)
 686 {
 687         return clear_extent_buffer_dirty(eb);
 688 }
 689
 690 int wait_on_tree_block_writeback(struct btrfs_root *root,
 691                                  struct extent_buffer *eb)
 692 {
 693         return 0;
 694 }
 695
 696 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
 697 {
 698         set_extent_buffer_dirty(eb);
 699 }
 700
 701 int btrfs_buffer_uptodate(struct extent_buffer *eb)
 702 {
 703         return extent_buffer_uptodate(eb);
 704 }
 705
 706 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
 707 {
 708         return set_extent_buffer_uptodate(eb);
 709 }