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                 return 1;
  42
  43         if (memcmp_extent_buffer(buf, root->fs_info->fsid,
  44                                  (unsigned long)btrfs_header_fsid(buf),
  45                                  BTRFS_FSID_SIZE))
  46                 return 1;
  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 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 wanted %X "
  74                                "found %X\n", (unsigned long long)buf->start,
  75                                *((int *)result), *((int *)buf));
  76                         return 1;
  77                 }
  78         } else {
  79                 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
  80         }
  81         return 0;
  82 }
  83
  84 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  85                                             u64 bytenr, u32 blocksize)
  86 {
  87         return find_extent_buffer(&root->fs_info->extent_cache,
  88                                   bytenr, blocksize);
  89 }
  90
  91 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  92                                                  u64 bytenr, u32 blocksize)
  93 {
  94         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
  95                                    blocksize);
  96 }
  97
  98 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  99                          u64 parent_transid)
 100 {
 101         int ret;
 102         int dev_nr;
 103         struct extent_buffer *eb;
 104         u64 length;
 105         struct btrfs_multi_bio *multi = NULL;
 106         struct btrfs_device *device;
 107
 108         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 109         if (eb && btrfs_buffer_uptodate(eb)) {
 110                 free_extent_buffer(eb);
 111                 return 0;
 112         }
 113
 114         dev_nr = 0;
 115         length = blocksize;
 116         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 117                               bytenr, &length, &multi, 0);
 118         BUG_ON(ret);
 119         device = multi->stripes[0].dev;
 120         device->total_ios++;
 121         blocksize = min(blocksize, (u32)(64 * 1024));
 122         readahead(device->fd, multi->stripes[0].physical, blocksize);
 123         kfree(multi);
 124         return 0;
 125 }
 126
 127 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 128                                      u32 blocksize, u64 parent_transid)
 129 {
 130         int ret;
 131         int dev_nr;
 132         struct extent_buffer *eb;
 133         u64 length;
 134         struct btrfs_multi_bio *multi = NULL;
 135         struct btrfs_device *device;
 136         int mirror_num = 0;
 137         int num_copies;
 138
 139         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 140         if (!eb)
 141                 return NULL;
 142
 143         if (btrfs_buffer_uptodate(eb))
 144                 return eb;
 145
 146         dev_nr = 0;
 147         length = blocksize;
 148         while (1) {
 149                 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 150                                       eb->start, &length, &multi, mirror_num);
 151                 BUG_ON(ret);
 152                 device = multi->stripes[0].dev;
 153                 eb->fd = device->fd;
 154                 device->total_ios++;
 155                 eb->dev_bytenr = multi->stripes[0].physical;
 156                 kfree(multi);
 157                 ret = read_extent_from_disk(eb);
 158                 if (ret == 0 && check_tree_block(root, eb) == 0 &&
 159                     csum_tree_block(root, eb, 1) == 0) {
 160                         btrfs_set_buffer_uptodate(eb);
 161                         return eb;
 162                 }
 163                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 164                                               eb->start, eb->len);
 165                 if (num_copies == 1) {
 166 printk("reading %Lu failed only one copy\n", eb->start);
 167                         break;
 168                 }
 169                 mirror_num++;
 170                 if (mirror_num > num_copies) {
 171 printk("bailing at mirror %d of %d\n", mirror_num, num_copies);
 172                         break;
 173                 }
 174         }
 175         free_extent_buffer(eb);
 176         return NULL;
 177 }
 178
 179 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 180                      struct extent_buffer *eb)
 181 {
 182         int ret;
 183         int dev_nr;
 184         u64 length;
 185         struct btrfs_multi_bio *multi = NULL;
 186
 187         if (check_tree_block(root, eb))
 188                 BUG();
 189         if (!btrfs_buffer_uptodate(eb))
 190                 BUG();
 191
 192         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 193         csum_tree_block(root, eb, 0);
 194
 195         dev_nr = 0;
 196         length = eb->len;
 197         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 198                               eb->start, &length, &multi, 0);
 199
 200         while(dev_nr < multi->num_stripes) {
 201                 BUG_ON(ret);
 202                 eb->fd = multi->stripes[dev_nr].dev->fd;
 203                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 204                 multi->stripes[dev_nr].dev->total_ios++;
 205                 dev_nr++;
 206                 ret = write_extent_to_disk(eb);
 207                 BUG_ON(ret);
 208         }
 209         kfree(multi);
 210         return 0;
 211 }
 212
 213 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 214                         u32 stripesize, struct btrfs_root *root,
 215                         struct btrfs_fs_info *fs_info, u64 objectid)
 216 {
 217         root->node = NULL;
 218         root->commit_root = NULL;
 219         root->sectorsize = sectorsize;
 220         root->nodesize = nodesize;
 221         root->leafsize = leafsize;
 222         root->stripesize = stripesize;
 223         root->ref_cows = 0;
 224         root->track_dirty = 0;
 225
 226         root->fs_info = fs_info;
 227         root->objectid = objectid;
 228         root->last_trans = 0;
 229         root->highest_inode = 0;
 230         root->last_inode_alloc = 0;
 231
 232         INIT_LIST_HEAD(&root->dirty_list);
 233         memset(&root->root_key, 0, sizeof(root->root_key));
 234         memset(&root->root_item, 0, sizeof(root->root_item));
 235         root->root_key.objectid = objectid;
 236         return 0;
 237 }
 238
 239 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 240                                struct btrfs_root *root)
 241 {
 242         int ret;
 243         u64 old_root_bytenr;
 244         struct btrfs_root *tree_root = root->fs_info->tree_root;
 245
 246         btrfs_write_dirty_block_groups(trans, root);
 247         while(1) {
 248                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 249                 if (old_root_bytenr == root->node->start)
 250                         break;
 251                 btrfs_set_root_bytenr(&root->root_item,
 252                                        root->node->start);
 253                 root->root_item.level = btrfs_header_level(root->node);
 254                 ret = btrfs_update_root(trans, tree_root,
 255                                         &root->root_key,
 256                                         &root->root_item);
 257                 BUG_ON(ret);
 258                 btrfs_write_dirty_block_groups(trans, root);
 259         }
 260         return 0;
 261 }
 262
 263 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 264                              struct btrfs_fs_info *fs_info)
 265 {
 266         struct btrfs_root *root;
 267         struct list_head *next;
 268
 269         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 270                 next = fs_info->dirty_cowonly_roots.next;
 271                 list_del_init(next);
 272                 root = list_entry(next, struct btrfs_root, dirty_list);
 273                 update_cowonly_root(trans, root);
 274         }
 275         return 0;
 276 }
 277
 278 static int __commit_transaction(struct btrfs_trans_handle *trans,
 279                                 struct btrfs_root *root)
 280 {
 281         u64 start;
 282         u64 end;
 283         struct extent_buffer *eb;
 284         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 285         int ret;
 286
 287         while(1) {
 288                 ret = find_first_extent_bit(tree, 0, &start, &end,
 289                                             EXTENT_DIRTY);
 290                 if (ret)
 291                         break;
 292                 while(start <= end) {
 293                         eb = find_first_extent_buffer(tree, start);
 294                         BUG_ON(!eb || eb->start != start);
 295                         ret = write_tree_block(trans, root, eb);
 296                         BUG_ON(ret);
 297                         start += eb->len;
 298                         clear_extent_buffer_dirty(eb);
 299                         free_extent_buffer(eb);
 300                 }
 301         }
 302         return 0;
 303 }
 304
 305 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 306                              struct btrfs_root *root)
 307 {
 308         int ret = 0;
 309         struct btrfs_root *new_root = NULL;
 310         struct btrfs_fs_info *fs_info = root->fs_info;
 311
 312         if (root->commit_root == root->node)
 313                 goto commit_tree;
 314
 315         new_root = malloc(sizeof(*new_root));
 316         if (!new_root)
 317                 return -ENOMEM;
 318         memcpy(new_root, root, sizeof(*new_root));
 319         new_root->node = root->commit_root;
 320         root->commit_root = NULL;
 321
 322         root->root_key.offset = trans->transid;
 323         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 324         root->root_item.level = btrfs_header_level(root->node);
 325         ret = btrfs_insert_root(trans, fs_info->tree_root,
 326                                 &root->root_key, &root->root_item);
 327         BUG_ON(ret);
 328
 329         btrfs_set_root_refs(&new_root->root_item, 0);
 330         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 331                                 &new_root->root_key, &new_root->root_item);
 332         BUG_ON(ret);
 333
 334         ret = commit_tree_roots(trans, fs_info);
 335         BUG_ON(ret);
 336         ret = __commit_transaction(trans, root);
 337         BUG_ON(ret);
 338         write_ctree_super(trans, root);
 339         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 340                                    &fs_info->pinned_extents);
 341         btrfs_free_transaction(root, trans);
 342         fs_info->running_transaction = NULL;
 343
 344         trans = btrfs_start_transaction(root, 1);
 345         ret = btrfs_drop_snapshot(trans, new_root);
 346         BUG_ON(ret);
 347         ret = btrfs_del_root(trans, fs_info->tree_root, &new_root->root_key);
 348         BUG_ON(ret);
 349 commit_tree:
 350         ret = commit_tree_roots(trans, fs_info);
 351         BUG_ON(ret);
 352         ret = __commit_transaction(trans, root);
 353         BUG_ON(ret);
 354         write_ctree_super(trans, root);
 355         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 356                                    &fs_info->pinned_extents);
 357         btrfs_free_transaction(root, trans);
 358         free_extent_buffer(root->commit_root);
 359         root->commit_root = NULL;
 360         fs_info->running_transaction = NULL;
 361         if (new_root) {
 362                 free_extent_buffer(new_root->node);
 363                 free(new_root);
 364         }
 365         return 0;
 366 }
 367
 368 static int find_and_setup_root(struct btrfs_root *tree_root,
 369                                struct btrfs_fs_info *fs_info,
 370                                u64 objectid, struct btrfs_root *root)
 371 {
 372         int ret;
 373         u32 blocksize;
 374
 375         __setup_root(tree_root->nodesize, tree_root->leafsize,
 376                      tree_root->sectorsize, tree_root->stripesize,
 377                      root, fs_info, objectid);
 378         ret = btrfs_find_last_root(tree_root, objectid,
 379                                    &root->root_item, &root->root_key);
 380         BUG_ON(ret);
 381
 382         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 383         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 384                                      blocksize, 0);
 385         BUG_ON(!root->node);
 386         return 0;
 387 }
 388
 389 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 390 {
 391         if (root->node)
 392                 free_extent_buffer(root->node);
 393         if (root->commit_root)
 394                 free_extent_buffer(root->commit_root);
 395
 396         free(root);
 397         return 0;
 398 }
 399
 400 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 401                                       struct btrfs_key *location)
 402 {
 403         struct btrfs_root *root;
 404         struct btrfs_root *tree_root = fs_info->tree_root;
 405         struct btrfs_path *path;
 406         struct extent_buffer *l;
 407         u32 blocksize;
 408         int ret = 0;
 409
 410         root = malloc(sizeof(*root));
 411         if (!root)
 412                 return ERR_PTR(-ENOMEM);
 413         memset(root, 0, sizeof(*root));
 414         if (location->offset == (u64)-1) {
 415                 ret = find_and_setup_root(tree_root, fs_info,
 416                                           location->objectid, root);
 417                 if (ret) {
 418                         free(root);
 419                         return ERR_PTR(ret);
 420                 }
 421                 goto insert;
 422         }
 423
 424         __setup_root(tree_root->nodesize, tree_root->leafsize,
 425                      tree_root->sectorsize, tree_root->stripesize,
 426                      root, fs_info, location->objectid);
 427
 428         path = btrfs_alloc_path();
 429         BUG_ON(!path);
 430         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 431         if (ret != 0) {
 432                 if (ret > 0)
 433                         ret = -ENOENT;
 434                 goto out;
 435         }
 436         l = path->nodes[0];
 437         read_extent_buffer(l, &root->root_item,
 438                btrfs_item_ptr_offset(l, path->slots[0]),
 439                sizeof(root->root_item));
 440         memcpy(&root->root_key, location, sizeof(*location));
 441         ret = 0;
 442 out:
 443         btrfs_release_path(root, path);
 444         btrfs_free_path(path);
 445         if (ret) {
 446                 free(root);
 447                 return ERR_PTR(ret);
 448         }
 449         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 450         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 451                                      blocksize, 0);
 452         BUG_ON(!root->node);
 453 insert:
 454         root->ref_cows = 1;
 455         return root;
 456 }
 457
 458 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
 459 {
 460         int fp;
 461         struct btrfs_root *root;
 462         int flags = O_CREAT | O_RDWR;
 463
 464         if (!writes)
 465                 flags = O_RDONLY;
 466
 467         fp = open(filename, flags, 0600);
 468         if (fp < 0) {
 469                 return NULL;
 470         }
 471         root = open_ctree_fd(fp, filename, sb_bytenr, writes);
 472         close(fp);
 473
 474         return root;
 475 }
 476
 477 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
 478                                  int writes)
 479 {
 480         u32 sectorsize;
 481         u32 nodesize;
 482         u32 leafsize;
 483         u32 blocksize;
 484         u32 stripesize;
 485         struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
 486         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 487         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 488         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 489         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 490         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 491         int ret;
 492         struct btrfs_super_block *disk_super;
 493         struct btrfs_fs_devices *fs_devices = NULL;
 494         u64 total_devs;
 495
 496         if (sb_bytenr == 0)
 497                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 498
 499         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 500                                     &total_devs, sb_bytenr);
 501
 502         if (ret) {
 503                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 504                 return NULL;
 505         }
 506
 507         if (total_devs != 1) {
 508                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 509                 BUG_ON(ret);
 510         }
 511
 512         memset(fs_info, 0, sizeof(*fs_info));
 513         fs_info->fs_root = root;
 514         fs_info->tree_root = tree_root;
 515         fs_info->extent_root = extent_root;
 516         fs_info->chunk_root = chunk_root;
 517         fs_info->dev_root = dev_root;
 518
 519         if (!writes)
 520                 fs_info->readonly = 1;
 521
 522         extent_io_tree_init(&fs_info->extent_cache);
 523         extent_io_tree_init(&fs_info->free_space_cache);
 524         extent_io_tree_init(&fs_info->block_group_cache);
 525         extent_io_tree_init(&fs_info->pinned_extents);
 526         extent_io_tree_init(&fs_info->pending_del);
 527         extent_io_tree_init(&fs_info->extent_ins);
 528
 529         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 530
 531         mutex_init(&fs_info->fs_mutex);
 532         fs_info->fs_devices = fs_devices;
 533         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 534         INIT_LIST_HEAD(&fs_info->space_info);
 535
 536         __setup_root(4096, 4096, 4096, 4096, tree_root,
 537                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 538
 539         if (writes)
 540                 ret = btrfs_open_devices(fs_devices, O_RDWR);
 541         else
 542                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
 543         BUG_ON(ret);
 544
 545         ret = btrfs_bootstrap_super_map(&fs_info->mapping_tree, fs_devices);
 546         BUG_ON(ret);
 547         fs_info->sb_buffer = btrfs_find_create_tree_block(tree_root, sb_bytenr,
 548                                                           4096);
 549         BUG_ON(!fs_info->sb_buffer);
 550         fs_info->sb_buffer->fd = fs_devices->latest_bdev;
 551         fs_info->sb_buffer->dev_bytenr = sb_bytenr;
 552         ret = read_extent_from_disk(fs_info->sb_buffer);
 553         BUG_ON(ret);
 554         btrfs_set_buffer_uptodate(fs_info->sb_buffer);
 555
 556         read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
 557                            sizeof(fs_info->super_copy));
 558         read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
 559                            (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
 560                            BTRFS_FSID_SIZE);
 561
 562         disk_super = &fs_info->super_copy;
 563         if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
 564                     sizeof(disk_super->magic))) {
 565                 printk("No valid btrfs found\n");
 566                 BUG_ON(1);
 567         }
 568         nodesize = btrfs_super_nodesize(disk_super);
 569         leafsize = btrfs_super_leafsize(disk_super);
 570         sectorsize = btrfs_super_sectorsize(disk_super);
 571         stripesize = btrfs_super_stripesize(disk_super);
 572         tree_root->nodesize = nodesize;
 573         tree_root->leafsize = leafsize;
 574         tree_root->sectorsize = sectorsize;
 575         tree_root->stripesize = stripesize;
 576
 577         ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
 578         BUG_ON(ret);
 579         ret = btrfs_read_sys_array(tree_root);
 580         BUG_ON(ret);
 581         blocksize = btrfs_level_size(tree_root,
 582                                      btrfs_super_chunk_root_level(disk_super));
 583
 584         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 585                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 586
 587         chunk_root->node = read_tree_block(chunk_root,
 588                                            btrfs_super_chunk_root(disk_super),
 589                                            blocksize, 0);
 590
 591         BUG_ON(!chunk_root->node);
 592
 593         read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
 594                  (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
 595                  BTRFS_UUID_SIZE);
 596
 597         ret = btrfs_read_chunk_tree(chunk_root);
 598         BUG_ON(ret);
 599
 600         blocksize = btrfs_level_size(tree_root,
 601                                      btrfs_super_root_level(disk_super));
 602
 603         tree_root->node = read_tree_block(tree_root,
 604                                           btrfs_super_root(disk_super),
 605                                           blocksize, 0);
 606         BUG_ON(!tree_root->node);
 607         ret = find_and_setup_root(tree_root, fs_info,
 608                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 609         BUG_ON(ret);
 610         extent_root->track_dirty = 1;
 611
 612         ret = find_and_setup_root(tree_root, fs_info,
 613                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 614         BUG_ON(ret);
 615         dev_root->track_dirty = 1;
 616
 617         ret = find_and_setup_root(tree_root, fs_info,
 618                                   BTRFS_FS_TREE_OBJECTID, root);
 619         BUG_ON(ret);
 620         root->ref_cows = 1;
 621         fs_info->generation = btrfs_super_generation(disk_super) + 1;
 622         btrfs_read_block_groups(root);
 623
 624         fs_info->data_alloc_profile = (u64)-1;
 625         fs_info->metadata_alloc_profile = (u64)-1;
 626         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 627
 628         return root;
 629 }
 630
 631 int write_all_supers(struct btrfs_root *root)
 632 {
 633         struct list_head *cur;
 634         struct list_head *head = &root->fs_info->fs_devices->devices;
 635         struct btrfs_device *dev;
 636         struct extent_buffer *sb;
 637         struct btrfs_dev_item *dev_item;
 638         int ret;
 639
 640         sb = root->fs_info->sb_buffer;
 641         dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
 642                                                       dev_item);
 643         list_for_each(cur, head) {
 644                 dev = list_entry(cur, struct btrfs_device, dev_list);
 645                 btrfs_set_device_type(sb, dev_item, dev->type);
 646                 btrfs_set_device_id(sb, dev_item, dev->devid);
 647                 btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
 648                 btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
 649                 btrfs_set_device_io_align(sb, dev_item, dev->io_align);
 650                 btrfs_set_device_io_width(sb, dev_item, dev->io_width);
 651                 btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
 652                 write_extent_buffer(sb, dev->uuid,
 653                                     (unsigned long)btrfs_device_uuid(dev_item),
 654                                     BTRFS_UUID_SIZE);
 655                 sb->fd = dev->fd;
 656                 sb->dev_bytenr = sb->start;
 657                 btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
 658                 csum_tree_block(root, sb, 0);
 659                 ret = write_extent_to_disk(sb);
 660                 BUG_ON(ret);
 661         }
 662         return 0;
 663 }
 664
 665 int write_ctree_super(struct btrfs_trans_handle *trans,
 666                       struct btrfs_root *root)
 667 {
 668         int ret;
 669         struct btrfs_root *tree_root = root->fs_info->tree_root;
 670         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
 671
 672         if (root->fs_info->readonly)
 673                 return 0;
 674
 675         btrfs_set_super_generation(&root->fs_info->super_copy,
 676                                    trans->transid);
 677         btrfs_set_super_root(&root->fs_info->super_copy,
 678                              tree_root->node->start);
 679         btrfs_set_super_root_level(&root->fs_info->super_copy,
 680                                    btrfs_header_level(tree_root->node));
 681         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
 682                                    chunk_root->node->start);
 683         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
 684                                          btrfs_header_level(chunk_root->node));
 685         write_extent_buffer(root->fs_info->sb_buffer,
 686                             &root->fs_info->super_copy, 0,
 687                             sizeof(root->fs_info->super_copy));
 688         ret = write_all_supers(root);
 689         if (ret)
 690                 fprintf(stderr, "failed to write new super block err %d\n", ret);
 691         return ret;
 692 }
 693
 694 static int close_all_devices(struct btrfs_fs_info *fs_info)
 695 {
 696         struct list_head *list;
 697         struct list_head *next;
 698         struct btrfs_device *device;
 699
 700         return 0;
 701
 702         list = &fs_info->fs_devices->devices;
 703         list_for_each(next, list) {
 704                 device = list_entry(next, struct btrfs_device, dev_list);
 705                 close(device->fd);
 706         }
 707         return 0;
 708 }
 709
 710 int close_ctree(struct btrfs_root *root)
 711 {
 712         int ret;
 713         struct btrfs_trans_handle *trans;
 714         struct btrfs_fs_info *fs_info = root->fs_info;
 715
 716         trans = btrfs_start_transaction(root, 1);
 717         btrfs_commit_transaction(trans, root);
 718         trans = btrfs_start_transaction(root, 1);
 719         ret = commit_tree_roots(trans, root->fs_info);
 720         BUG_ON(ret);
 721         ret = __commit_transaction(trans, root);
 722         BUG_ON(ret);
 723         write_ctree_super(trans, root);
 724         btrfs_free_transaction(root, trans);
 725         btrfs_free_block_groups(root->fs_info);
 726         if (root->node)
 727                 free_extent_buffer(root->node);
 728         if (root->fs_info->extent_root->node)
 729                 free_extent_buffer(root->fs_info->extent_root->node);
 730         if (root->fs_info->tree_root->node)
 731                 free_extent_buffer(root->fs_info->tree_root->node);
 732         free_extent_buffer(root->commit_root);
 733         free_extent_buffer(root->fs_info->sb_buffer);
 734
 735         if (root->fs_info->chunk_root->node);
 736                 free_extent_buffer(root->fs_info->chunk_root->node);
 737
 738         if (root->fs_info->dev_root->node);
 739                 free_extent_buffer(root->fs_info->dev_root->node);
 740
 741         close_all_devices(root->fs_info);
 742         extent_io_tree_cleanup(&fs_info->extent_cache);
 743         extent_io_tree_cleanup(&fs_info->free_space_cache);
 744         extent_io_tree_cleanup(&fs_info->block_group_cache);
 745         extent_io_tree_cleanup(&fs_info->pinned_extents);
 746         extent_io_tree_cleanup(&fs_info->pending_del);
 747         extent_io_tree_cleanup(&fs_info->extent_ins);
 748
 749         free(fs_info->tree_root);
 750         free(fs_info->extent_root);
 751         free(fs_info->fs_root);
 752         free(fs_info->chunk_root);
 753         free(fs_info->dev_root);
 754         free(fs_info);
 755
 756         return 0;
 757 }
 758
 759 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 760                      struct extent_buffer *eb)
 761 {
 762         return clear_extent_buffer_dirty(eb);
 763 }
 764
 765 int wait_on_tree_block_writeback(struct btrfs_root *root,
 766                                  struct extent_buffer *eb)
 767 {
 768         return 0;
 769 }
 770
 771 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
 772 {
 773         set_extent_buffer_dirty(eb);
 774 }
 775
 776 int btrfs_buffer_uptodate(struct extent_buffer *eb)
 777 {
 778         return extent_buffer_uptodate(eb);
 779 }
 780
 781 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
 782 {
 783         return set_extent_buffer_uptodate(eb);
 784 }