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 dev_nr;
 101         struct extent_buffer *eb;
 102         u64 length;
 103         struct btrfs_multi_bio *multi = NULL;
 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         length = blocksize;
 114         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 115                               bytenr, &length, &multi);
 116         BUG_ON(ret);
 117         device = multi->stripes[0].dev;
 118         device->total_ios++;
 119         blocksize = min(blocksize, (u32)(64 * 1024));
 120         readahead(device->fd, multi->stripes[0].physical, blocksize);
 121         kfree(multi);
 122         return 0;
 123 }
 124
 125 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 126                                      u32 blocksize)
 127 {
 128         int ret;
 129         int dev_nr;
 130         struct extent_buffer *eb;
 131         u64 length;
 132         struct btrfs_multi_bio *multi = NULL;
 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         length = blocksize;
 144         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 145                               eb->start, &length, &multi);
 146         BUG_ON(ret);
 147         device = multi->stripes[0].dev;
 148         eb->fd = device->fd;
 149         device->total_ios++;
 150         eb->dev_bytenr = multi->stripes[0].physical;
 151         ret = read_extent_from_disk(eb);
 152         if (ret) {
 153                 free_extent_buffer(eb);
 154                 return NULL;
 155         }
 156         btrfs_set_buffer_uptodate(eb);
 157         kfree(multi);
 158         return eb;
 159 }
 160
 161 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 162                      struct extent_buffer *eb)
 163 {
 164         int ret;
 165         int dev_nr;
 166         u64 length;
 167         struct btrfs_multi_bio *multi = NULL;
 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         length = eb->len;
 179         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 180                               eb->start, &length, &multi);
 181         while(dev_nr < multi->num_stripes) {
 182                 BUG_ON(ret);
 183                 eb->fd = multi->stripes[dev_nr].dev->fd;
 184                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 185                 multi->stripes[dev_nr].dev->total_ios++;
 186                 dev_nr++;
 187                 ret = write_extent_to_disk(eb);
 188                 BUG_ON(ret);
 189         }
 190         kfree(multi);
 191         return 0;
 192 }
 193
 194 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 195                         u32 stripesize, struct btrfs_root *root,
 196                         struct btrfs_fs_info *fs_info, u64 objectid)
 197 {
 198         root->node = NULL;
 199         root->commit_root = NULL;
 200         root->sectorsize = sectorsize;
 201         root->nodesize = nodesize;
 202         root->leafsize = leafsize;
 203         root->stripesize = stripesize;
 204         root->ref_cows = 0;
 205         root->track_dirty = 0;
 206
 207         root->fs_info = fs_info;
 208         root->objectid = objectid;
 209         root->last_trans = 0;
 210         root->highest_inode = 0;
 211         root->last_inode_alloc = 0;
 212
 213         INIT_LIST_HEAD(&root->dirty_list);
 214         memset(&root->root_key, 0, sizeof(root->root_key));
 215         memset(&root->root_item, 0, sizeof(root->root_item));
 216         root->root_key.objectid = objectid;
 217         return 0;
 218 }
 219
 220 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 221                                struct btrfs_root *root)
 222 {
 223         int ret;
 224         u64 old_root_bytenr;
 225         struct btrfs_root *tree_root = root->fs_info->tree_root;
 226
 227         btrfs_write_dirty_block_groups(trans, root);
 228         while(1) {
 229                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 230                 if (old_root_bytenr == root->node->start)
 231                         break;
 232                 btrfs_set_root_bytenr(&root->root_item,
 233                                        root->node->start);
 234                 root->root_item.level = btrfs_header_level(root->node);
 235                 ret = btrfs_update_root(trans, tree_root,
 236                                         &root->root_key,
 237                                         &root->root_item);
 238                 BUG_ON(ret);
 239                 btrfs_write_dirty_block_groups(trans, root);
 240         }
 241         return 0;
 242 }
 243
 244 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 245                              struct btrfs_fs_info *fs_info)
 246 {
 247         struct btrfs_root *root;
 248         struct list_head *next;
 249
 250         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 251                 next = fs_info->dirty_cowonly_roots.next;
 252                 list_del_init(next);
 253                 root = list_entry(next, struct btrfs_root, dirty_list);
 254                 update_cowonly_root(trans, root);
 255         }
 256         return 0;
 257 }
 258
 259 static int __commit_transaction(struct btrfs_trans_handle *trans,
 260                                 struct btrfs_root *root)
 261 {
 262         u64 start;
 263         u64 end;
 264         struct extent_buffer *eb;
 265         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 266         int ret;
 267
 268         while(1) {
 269                 ret = find_first_extent_bit(tree, 0, &start, &end,
 270                                             EXTENT_DIRTY);
 271                 if (ret)
 272                         break;
 273                 while(start <= end) {
 274                         eb = find_first_extent_buffer(tree, start);
 275                         BUG_ON(!eb || eb->start != start);
 276                         ret = write_tree_block(trans, root, eb);
 277                         BUG_ON(ret);
 278                         start += eb->len;
 279                         clear_extent_buffer_dirty(eb);
 280                         free_extent_buffer(eb);
 281                 }
 282         }
 283         return 0;
 284 }
 285
 286 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 287                              struct btrfs_root *root)
 288 {
 289         int ret = 0;
 290         struct btrfs_root *new_root = NULL;
 291         struct btrfs_fs_info *fs_info = root->fs_info;
 292
 293         if (root->commit_root == root->node)
 294                 goto commit_tree;
 295
 296         new_root = malloc(sizeof(*new_root));
 297         if (!new_root)
 298                 return -ENOMEM;
 299         memcpy(new_root, root, sizeof(*new_root));
 300         new_root->node = root->commit_root;
 301         root->commit_root = NULL;
 302
 303         root->root_key.offset = trans->transid;
 304         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 305         root->root_item.level = btrfs_header_level(root->node);
 306         ret = btrfs_insert_root(trans, fs_info->tree_root,
 307                                 &root->root_key, &root->root_item);
 308         BUG_ON(ret);
 309
 310         btrfs_set_root_refs(&new_root->root_item, 0);
 311         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 312                                 &new_root->root_key, &new_root->root_item);
 313         BUG_ON(ret);
 314
 315         ret = commit_tree_roots(trans, fs_info);
 316         BUG_ON(ret);
 317         ret = __commit_transaction(trans, root);
 318         BUG_ON(ret);
 319         write_ctree_super(trans, root);
 320         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 321                                    &fs_info->pinned_extents);
 322         btrfs_free_transaction(root, trans);
 323         fs_info->running_transaction = NULL;
 324
 325         trans = btrfs_start_transaction(root, 1);
 326         ret = btrfs_drop_snapshot(trans, new_root);
 327         BUG_ON(ret);
 328         ret = btrfs_del_root(trans, fs_info->tree_root, &new_root->root_key);
 329         BUG_ON(ret);
 330 commit_tree:
 331         ret = commit_tree_roots(trans, fs_info);
 332         BUG_ON(ret);
 333         ret = __commit_transaction(trans, root);
 334         BUG_ON(ret);
 335         write_ctree_super(trans, root);
 336         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 337                                    &fs_info->pinned_extents);
 338         btrfs_free_transaction(root, trans);
 339         free_extent_buffer(root->commit_root);
 340         root->commit_root = NULL;
 341         fs_info->running_transaction = NULL;
 342         if (new_root) {
 343                 free_extent_buffer(new_root->node);
 344                 free(new_root);
 345         }
 346         return 0;
 347 }
 348
 349 static int find_and_setup_root(struct btrfs_root *tree_root,
 350                                struct btrfs_fs_info *fs_info,
 351                                u64 objectid, struct btrfs_root *root)
 352 {
 353         int ret;
 354         u32 blocksize;
 355
 356         __setup_root(tree_root->nodesize, tree_root->leafsize,
 357                      tree_root->sectorsize, tree_root->stripesize,
 358                      root, fs_info, objectid);
 359         ret = btrfs_find_last_root(tree_root, objectid,
 360                                    &root->root_item, &root->root_key);
 361         BUG_ON(ret);
 362
 363         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 364         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 365                                      blocksize);
 366         BUG_ON(!root->node);
 367         return 0;
 368 }
 369
 370 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 371 {
 372         if (root->node)
 373                 free_extent_buffer(root->node);
 374         if (root->commit_root)
 375                 free_extent_buffer(root->commit_root);
 376
 377         free(root);
 378         return 0;
 379 }
 380
 381 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 382                                       struct btrfs_key *location)
 383 {
 384         struct btrfs_root *root;
 385         struct btrfs_root *tree_root = fs_info->tree_root;
 386         struct btrfs_path *path;
 387         struct extent_buffer *l;
 388         u32 blocksize;
 389         int ret = 0;
 390
 391         root = malloc(sizeof(*root));
 392         if (!root)
 393                 return ERR_PTR(-ENOMEM);
 394         memset(root, 0, sizeof(*root));
 395         if (location->offset == (u64)-1) {
 396                 ret = find_and_setup_root(tree_root, fs_info,
 397                                           location->objectid, root);
 398                 if (ret) {
 399                         free(root);
 400                         return ERR_PTR(ret);
 401                 }
 402                 goto insert;
 403         }
 404
 405         __setup_root(tree_root->nodesize, tree_root->leafsize,
 406                      tree_root->sectorsize, tree_root->stripesize,
 407                      root, fs_info, location->objectid);
 408
 409         path = btrfs_alloc_path();
 410         BUG_ON(!path);
 411         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 412         if (ret != 0) {
 413                 if (ret > 0)
 414                         ret = -ENOENT;
 415                 goto out;
 416         }
 417         l = path->nodes[0];
 418         read_extent_buffer(l, &root->root_item,
 419                btrfs_item_ptr_offset(l, path->slots[0]),
 420                sizeof(root->root_item));
 421         memcpy(&root->root_key, location, sizeof(*location));
 422         ret = 0;
 423 out:
 424         btrfs_release_path(root, path);
 425         btrfs_free_path(path);
 426         if (ret) {
 427                 free(root);
 428                 return ERR_PTR(ret);
 429         }
 430         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 431         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 432                                      blocksize);
 433         BUG_ON(!root->node);
 434 insert:
 435         root->ref_cows = 1;
 436         return root;
 437 }
 438
 439 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr)
 440 {
 441         int fp;
 442
 443         fp = open(filename, O_CREAT | O_RDWR, 0600);
 444         if (fp < 0) {
 445                 return NULL;
 446         }
 447         return open_ctree_fd(fp, filename, sb_bytenr);
 448 }
 449
 450 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr)
 451 {
 452         u32 sectorsize;
 453         u32 nodesize;
 454         u32 leafsize;
 455         u32 blocksize;
 456         u32 stripesize;
 457         struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
 458         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 459         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 460         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 461         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 462         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 463         int ret;
 464         struct btrfs_super_block *disk_super;
 465         struct btrfs_fs_devices *fs_devices = NULL;
 466         u64 total_devs;
 467
 468         if (sb_bytenr == 0)
 469                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 470
 471         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 472                                     &total_devs, sb_bytenr);
 473
 474         if (ret) {
 475                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 476                 return NULL;
 477         }
 478         fprintf(stderr, "found Btrfs on %s with %lu devices\n", path,
 479                 (unsigned long)total_devs);
 480
 481         if (total_devs != 1) {
 482                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 483                 BUG_ON(ret);
 484         }
 485
 486         memset(fs_info, 0, sizeof(*fs_info));
 487         fs_info->fp = fs_devices->lowest_bdev;
 488         fs_info->fs_root = root;
 489         fs_info->tree_root = tree_root;
 490         fs_info->extent_root = extent_root;
 491         fs_info->chunk_root = chunk_root;
 492         fs_info->dev_root = dev_root;
 493
 494         extent_io_tree_init(&fs_info->extent_cache);
 495         extent_io_tree_init(&fs_info->free_space_cache);
 496         extent_io_tree_init(&fs_info->block_group_cache);
 497         extent_io_tree_init(&fs_info->pinned_extents);
 498         extent_io_tree_init(&fs_info->pending_del);
 499         extent_io_tree_init(&fs_info->extent_ins);
 500
 501         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 502
 503         mutex_init(&fs_info->fs_mutex);
 504         fs_info->fs_devices = fs_devices;
 505         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 506         INIT_LIST_HEAD(&fs_info->space_info);
 507
 508         __setup_root(4096, 4096, 4096, 4096, tree_root,
 509                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 510
 511         ret = btrfs_open_devices(fs_devices, O_RDWR);
 512         BUG_ON(ret);
 513
 514         fs_info->sb_buffer = btrfs_find_create_tree_block(tree_root, sb_bytenr,
 515                                                           4096);
 516         BUG_ON(!fs_info->sb_buffer);
 517         fs_info->sb_buffer->fd = fs_devices->lowest_bdev;
 518         fs_info->sb_buffer->dev_bytenr = sb_bytenr;
 519         ret = read_extent_from_disk(fs_info->sb_buffer);
 520         BUG_ON(ret);
 521         btrfs_set_buffer_uptodate(fs_info->sb_buffer);
 522
 523         read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
 524                            sizeof(fs_info->super_copy));
 525         read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
 526                            (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
 527                            BTRFS_FSID_SIZE);
 528
 529         disk_super = &fs_info->super_copy;
 530         if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
 531                     sizeof(disk_super->magic))) {
 532                 printk("No valid btrfs found\n");
 533                 BUG_ON(1);
 534         }
 535         nodesize = btrfs_super_nodesize(disk_super);
 536         leafsize = btrfs_super_leafsize(disk_super);
 537         sectorsize = btrfs_super_sectorsize(disk_super);
 538         stripesize = btrfs_super_stripesize(disk_super);
 539         tree_root->nodesize = nodesize;
 540         tree_root->leafsize = leafsize;
 541         tree_root->sectorsize = sectorsize;
 542         tree_root->stripesize = stripesize;
 543
 544         ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
 545         BUG_ON(ret);
 546         ret = btrfs_read_sys_array(tree_root);
 547         BUG_ON(ret);
 548         blocksize = btrfs_level_size(tree_root,
 549                                      btrfs_super_chunk_root_level(disk_super));
 550
 551         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 552                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 553
 554         chunk_root->node = read_tree_block(chunk_root,
 555                                            btrfs_super_chunk_root(disk_super),
 556                                            blocksize);
 557
 558         BUG_ON(!chunk_root->node);
 559
 560         ret = btrfs_read_chunk_tree(chunk_root);
 561         BUG_ON(ret);
 562
 563         blocksize = btrfs_level_size(tree_root,
 564                                      btrfs_super_root_level(disk_super));
 565
 566         tree_root->node = read_tree_block(tree_root,
 567                                           btrfs_super_root(disk_super),
 568                                           blocksize);
 569         BUG_ON(!tree_root->node);
 570         ret = find_and_setup_root(tree_root, fs_info,
 571                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 572         BUG_ON(ret);
 573         extent_root->track_dirty = 1;
 574
 575         ret = find_and_setup_root(tree_root, fs_info,
 576                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 577         BUG_ON(ret);
 578         dev_root->track_dirty = 1;
 579
 580         ret = find_and_setup_root(tree_root, fs_info,
 581                                   BTRFS_FS_TREE_OBJECTID, root);
 582         BUG_ON(ret);
 583         root->ref_cows = 1;
 584         fs_info->generation = btrfs_super_generation(disk_super) + 1;
 585         btrfs_read_block_groups(root);
 586
 587         fs_info->data_alloc_profile = (u64)-1;
 588         fs_info->metadata_alloc_profile = (u64)-1;
 589         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 590
 591         return root;
 592 }
 593
 594 int write_ctree_super(struct btrfs_trans_handle *trans,
 595                       struct btrfs_root *root)
 596 {
 597         int ret;
 598         struct btrfs_root *tree_root = root->fs_info->tree_root;
 599         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
 600         btrfs_set_super_generation(&root->fs_info->super_copy,
 601                                    trans->transid);
 602         btrfs_set_super_root(&root->fs_info->super_copy,
 603                              tree_root->node->start);
 604         btrfs_set_super_root_level(&root->fs_info->super_copy,
 605                                    btrfs_header_level(tree_root->node));
 606         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
 607                                    chunk_root->node->start);
 608         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
 609                                          btrfs_header_level(chunk_root->node));
 610         write_extent_buffer(root->fs_info->sb_buffer,
 611                             &root->fs_info->super_copy, 0,
 612                             sizeof(root->fs_info->super_copy));
 613         ret = write_tree_block(trans, root, root->fs_info->sb_buffer);
 614         if (ret)
 615                 fprintf(stderr, "failed to write new super block err %d\n", ret);
 616         return ret;
 617 }
 618
 619 static int close_all_devices(struct btrfs_fs_info *fs_info)
 620 {
 621         struct list_head *list;
 622         struct list_head *next;
 623         struct btrfs_device *device;
 624
 625         return 0;
 626
 627         list = &fs_info->fs_devices->devices;
 628         list_for_each(next, list) {
 629                 device = list_entry(next, struct btrfs_device, dev_list);
 630                 // close(device->fd);
 631         }
 632         return 0;
 633 }
 634
 635 int close_ctree(struct btrfs_root *root)
 636 {
 637         int ret;
 638         struct btrfs_trans_handle *trans;
 639         struct btrfs_fs_info *fs_info = root->fs_info;
 640
 641         trans = btrfs_start_transaction(root, 1);
 642         btrfs_commit_transaction(trans, root);
 643         trans = btrfs_start_transaction(root, 1);
 644         ret = commit_tree_roots(trans, root->fs_info);
 645         BUG_ON(ret);
 646         ret = __commit_transaction(trans, root);
 647         BUG_ON(ret);
 648         write_ctree_super(trans, root);
 649         btrfs_free_transaction(root, trans);
 650         btrfs_free_block_groups(root->fs_info);
 651         close(root->fs_info->fp);
 652         if (root->node)
 653                 free_extent_buffer(root->node);
 654         if (root->fs_info->extent_root->node)
 655                 free_extent_buffer(root->fs_info->extent_root->node);
 656         if (root->fs_info->tree_root->node)
 657                 free_extent_buffer(root->fs_info->tree_root->node);
 658         free_extent_buffer(root->commit_root);
 659         free_extent_buffer(root->fs_info->sb_buffer);
 660
 661         if (root->fs_info->chunk_root->node);
 662                 free_extent_buffer(root->fs_info->chunk_root->node);
 663
 664         if (root->fs_info->dev_root->node);
 665                 free_extent_buffer(root->fs_info->dev_root->node);
 666
 667         close_all_devices(root->fs_info);
 668         extent_io_tree_cleanup(&fs_info->extent_cache);
 669         extent_io_tree_cleanup(&fs_info->free_space_cache);
 670         extent_io_tree_cleanup(&fs_info->block_group_cache);
 671         extent_io_tree_cleanup(&fs_info->pinned_extents);
 672         extent_io_tree_cleanup(&fs_info->pending_del);
 673         extent_io_tree_cleanup(&fs_info->extent_ins);
 674
 675         free(fs_info->tree_root);
 676         free(fs_info->extent_root);
 677         free(fs_info->fs_root);
 678         free(fs_info->chunk_root);
 679         free(fs_info->dev_root);
 680         free(fs_info);
 681
 682         return 0;
 683 }
 684
 685 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 686                      struct extent_buffer *eb)
 687 {
 688         return clear_extent_buffer_dirty(eb);
 689 }
 690
 691 int wait_on_tree_block_writeback(struct btrfs_root *root,
 692                                  struct extent_buffer *eb)
 693 {
 694         return 0;
 695 }
 696
 697 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
 698 {
 699         set_extent_buffer_dirty(eb);
 700 }
 701
 702 int btrfs_buffer_uptodate(struct extent_buffer *eb)
 703 {
 704         return extent_buffer_uptodate(eb);
 705 }
 706
 707 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
 708 {
 709         return set_extent_buffer_uptodate(eb);
 710 }