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
  41         struct btrfs_fs_devices *fs_devices;
  42         int ret = 1;
  43
  44         if (buf->start != btrfs_header_bytenr(buf)) {
  45                 printk("Check tree block failed, want=%Lu, have=%Lu\n",
  46                        buf->start, btrfs_header_bytenr(buf));
  47                 return ret;
  48         }
  49
  50         fs_devices = root->fs_info->fs_devices;
  51         while (fs_devices) {
  52                 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
  53                                           (unsigned long)btrfs_header_fsid(buf),
  54                                           BTRFS_FSID_SIZE)) {
  55                         ret = 0;
  56                         break;
  57                 }
  58                 fs_devices = fs_devices->seed;
  59         }
  60         return ret;
  61 }
  62
  63 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  64 {
  65         return crc32c(seed, data, len);
  66 }
  67
  68 void btrfs_csum_final(u32 crc, char *result)
  69 {
  70         *(__le32 *)result = ~cpu_to_le32(crc);
  71 }
  72
  73 static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
  74                                   int verify, int silent)
  75 {
  76         char *result;
  77         u32 len;
  78         u32 crc = ~(u32)0;
  79
  80         result = malloc(csum_size * sizeof(char));
  81         if (!result)
  82                 return 1;
  83
  84         len = buf->len - BTRFS_CSUM_SIZE;
  85         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  86         btrfs_csum_final(crc, result);
  87
  88         if (verify) {
  89                 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
  90                         if (!silent)
  91                                 printk("checksum verify failed on %llu found %08X wanted %08X\n",
  92                                        (unsigned long long)buf->start,
  93                                        *((u32 *)result),
  94                                        *((u32*)(char *)buf->data));
  95                         free(result);
  96                         return 1;
  97                 }
  98         } else {
  99                 write_extent_buffer(buf, result, 0, csum_size);
 100         }
 101         free(result);
 102         return 0;
 103 }
 104
 105 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
 106 {
 107         return __csum_tree_block_size(buf, csum_size, verify, 0);
 108 }
 109
 110 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
 111 {
 112         return __csum_tree_block_size(buf, csum_size, 1, 1);
 113 }
 114
 115 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 116                            int verify)
 117 {
 118         u16 csum_size =
 119                 btrfs_super_csum_size(root->fs_info->super_copy);
 120         return csum_tree_block_size(buf, csum_size, verify);
 121 }
 122
 123 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 124                                             u64 bytenr, u32 blocksize)
 125 {
 126         return find_extent_buffer(&root->fs_info->extent_cache,
 127                                   bytenr, blocksize);
 128 }
 129
 130 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 131                                                  u64 bytenr, u32 blocksize)
 132 {
 133         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
 134                                    blocksize);
 135 }
 136
 137 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
 138                          u64 parent_transid)
 139 {
 140         int ret;
 141         struct extent_buffer *eb;
 142         u64 length;
 143         struct btrfs_multi_bio *multi = NULL;
 144         struct btrfs_device *device;
 145
 146         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 147         if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
 148                 free_extent_buffer(eb);
 149                 return 0;
 150         }
 151
 152         length = blocksize;
 153         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 154                               bytenr, &length, &multi, 0, NULL);
 155         BUG_ON(ret);
 156         device = multi->stripes[0].dev;
 157         device->total_ios++;
 158         blocksize = min(blocksize, (u32)(64 * 1024));
 159         readahead(device->fd, multi->stripes[0].physical, blocksize);
 160         kfree(multi);
 161         return 0;
 162 }
 163
 164 static int verify_parent_transid(struct extent_io_tree *io_tree,
 165                                  struct extent_buffer *eb, u64 parent_transid,
 166                                  int ignore)
 167 {
 168         int ret;
 169
 170         if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
 171                 return 0;
 172
 173         if (extent_buffer_uptodate(eb) &&
 174             btrfs_header_generation(eb) == parent_transid) {
 175                 ret = 0;
 176                 goto out;
 177         }
 178         printk("parent transid verify failed on %llu wanted %llu found %llu\n",
 179                (unsigned long long)eb->start,
 180                (unsigned long long)parent_transid,
 181                (unsigned long long)btrfs_header_generation(eb));
 182         if (ignore) {
 183                 printk("Ignoring transid failure\n");
 184                 return 0;
 185         }
 186
 187         ret = 1;
 188 out:
 189         clear_extent_buffer_uptodate(io_tree, eb);
 190         return ret;
 191
 192 }
 193
 194
 195 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
 196 {
 197         unsigned long offset = 0;
 198         struct btrfs_multi_bio *multi = NULL;
 199         struct btrfs_device *device;
 200         int ret = 0;
 201         u64 read_len;
 202         unsigned long bytes_left = eb->len;
 203
 204         while (bytes_left) {
 205                 read_len = bytes_left;
 206                 device = NULL;
 207
 208                 if (!info->on_restoring) {
 209                         ret = btrfs_map_block(&info->mapping_tree, READ,
 210                                               eb->start + offset, &read_len, &multi,
 211                                               mirror, NULL);
 212                         if (ret) {
 213                                 printk("Couldn't map the block %Lu\n", eb->start + offset);
 214                                 kfree(multi);
 215                                 return -EIO;
 216                         }
 217                         device = multi->stripes[0].dev;
 218
 219                         if (device->fd == 0) {
 220                                 kfree(multi);
 221                                 return -EIO;
 222                         }
 223
 224                         eb->fd = device->fd;
 225                         device->total_ios++;
 226                         eb->dev_bytenr = multi->stripes[0].physical;
 227                         kfree(multi);
 228                         multi = NULL;
 229                 } else {
 230                         /* special case for restore metadump */
 231                         list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
 232                                 if (device->devid == 1)
 233                                         break;
 234                         }
 235
 236                         eb->fd = device->fd;
 237                         eb->dev_bytenr = eb->start;
 238                         device->total_ios++;
 239                 }
 240
 241                 if (read_len > bytes_left)
 242                         read_len = bytes_left;
 243
 244                 ret = read_extent_from_disk(eb, offset, read_len);
 245                 if (ret)
 246                         return -EIO;
 247                 offset += read_len;
 248                 bytes_left -= read_len;
 249         }
 250         return 0;
 251 }
 252
 253 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 254                                      u32 blocksize, u64 parent_transid)
 255 {
 256         int ret;
 257         struct extent_buffer *eb;
 258         u64 best_transid = 0;
 259         int mirror_num = 0;
 260         int good_mirror = 0;
 261         int num_copies;
 262         int ignore = 0;
 263
 264         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 265         if (!eb)
 266                 return NULL;
 267
 268         if (btrfs_buffer_uptodate(eb, parent_transid))
 269                 return eb;
 270
 271         while (1) {
 272                 ret = read_whole_eb(root->fs_info, eb, mirror_num);
 273                 if (ret == 0 && check_tree_block(root, eb) == 0 &&
 274                     csum_tree_block(root, eb, 1) == 0 &&
 275                     verify_parent_transid(eb->tree, eb, parent_transid, ignore)
 276                     == 0) {
 277                         btrfs_set_buffer_uptodate(eb);
 278                         return eb;
 279                 }
 280                 if (ignore) {
 281                         if (check_tree_block(root, eb))
 282                                 printk("read block failed check_tree_block\n");
 283                         else
 284                                 printk("Csum didn't match\n");
 285                         break;
 286                 }
 287                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 288                                               eb->start, eb->len);
 289                 if (num_copies == 1) {
 290                         ignore = 1;
 291                         continue;
 292                 }
 293                 if (btrfs_header_generation(eb) > best_transid) {
 294                         best_transid = btrfs_header_generation(eb);
 295                         good_mirror = mirror_num;
 296                 }
 297                 mirror_num++;
 298                 if (mirror_num > num_copies) {
 299                         mirror_num = good_mirror;
 300                         ignore = 1;
 301                         continue;
 302                 }
 303         }
 304         free_extent_buffer(eb);
 305         return NULL;
 306 }
 307
 308 static int write_tree_block(struct btrfs_trans_handle *trans,
 309                             struct btrfs_root *root,
 310                             struct extent_buffer *eb)
 311 {
 312         int ret;
 313         int dev_nr;
 314         u64 length;
 315         u64 *raid_map = NULL;
 316         struct btrfs_multi_bio *multi = NULL;
 317
 318         if (check_tree_block(root, eb))
 319                 BUG();
 320
 321         if (!btrfs_buffer_uptodate(eb, trans->transid))
 322                 BUG();
 323
 324         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 325         csum_tree_block(root, eb, 0);
 326
 327         dev_nr = 0;
 328         length = eb->len;
 329         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 330                               eb->start, &length, &multi, 0, &raid_map);
 331
 332         if (raid_map) {
 333                 ret = write_raid56_with_parity(root->fs_info, eb, multi,
 334                                                length, raid_map);
 335                 BUG_ON(ret);
 336         } else while (dev_nr < multi->num_stripes) {
 337                 BUG_ON(ret);
 338                 eb->fd = multi->stripes[dev_nr].dev->fd;
 339                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 340                 multi->stripes[dev_nr].dev->total_ios++;
 341                 dev_nr++;
 342                 ret = write_extent_to_disk(eb);
 343                 BUG_ON(ret);
 344         }
 345         kfree(multi);
 346         return 0;
 347 }
 348
 349 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 350                         u32 stripesize, struct btrfs_root *root,
 351                         struct btrfs_fs_info *fs_info, u64 objectid)
 352 {
 353         root->node = NULL;
 354         root->commit_root = NULL;
 355         root->sectorsize = sectorsize;
 356         root->nodesize = nodesize;
 357         root->leafsize = leafsize;
 358         root->stripesize = stripesize;
 359         root->ref_cows = 0;
 360         root->track_dirty = 0;
 361
 362         root->fs_info = fs_info;
 363         root->objectid = objectid;
 364         root->last_trans = 0;
 365         root->highest_inode = 0;
 366         root->last_inode_alloc = 0;
 367
 368         INIT_LIST_HEAD(&root->dirty_list);
 369         memset(&root->root_key, 0, sizeof(root->root_key));
 370         memset(&root->root_item, 0, sizeof(root->root_item));
 371         root->root_key.objectid = objectid;
 372         return 0;
 373 }
 374
 375 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 376                                struct btrfs_root *root)
 377 {
 378         int ret;
 379         u64 old_root_bytenr;
 380         struct btrfs_root *tree_root = root->fs_info->tree_root;
 381
 382         btrfs_write_dirty_block_groups(trans, root);
 383         while(1) {
 384                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 385                 if (old_root_bytenr == root->node->start)
 386                         break;
 387                 btrfs_set_root_bytenr(&root->root_item,
 388                                        root->node->start);
 389                 btrfs_set_root_generation(&root->root_item,
 390                                           trans->transid);
 391                 root->root_item.level = btrfs_header_level(root->node);
 392                 ret = btrfs_update_root(trans, tree_root,
 393                                         &root->root_key,
 394                                         &root->root_item);
 395                 BUG_ON(ret);
 396                 btrfs_write_dirty_block_groups(trans, root);
 397         }
 398         return 0;
 399 }
 400
 401 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 402                              struct btrfs_fs_info *fs_info)
 403 {
 404         struct btrfs_root *root;
 405         struct list_head *next;
 406         struct extent_buffer *eb;
 407         int ret;
 408
 409         if (fs_info->readonly)
 410                 return 0;
 411
 412         eb = fs_info->tree_root->node;
 413         extent_buffer_get(eb);
 414         ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 415         free_extent_buffer(eb);
 416         if (ret)
 417                 return ret;
 418
 419         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 420                 next = fs_info->dirty_cowonly_roots.next;
 421                 list_del_init(next);
 422                 root = list_entry(next, struct btrfs_root, dirty_list);
 423                 update_cowonly_root(trans, root);
 424                 free_extent_buffer(root->commit_root);
 425                 root->commit_root = NULL;
 426         }
 427
 428         return 0;
 429 }
 430
 431 static int __commit_transaction(struct btrfs_trans_handle *trans,
 432                                 struct btrfs_root *root)
 433 {
 434         u64 start;
 435         u64 end;
 436         struct extent_buffer *eb;
 437         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 438         int ret;
 439
 440         while(1) {
 441                 ret = find_first_extent_bit(tree, 0, &start, &end,
 442                                             EXTENT_DIRTY);
 443                 if (ret)
 444                         break;
 445                 while(start <= end) {
 446                         eb = find_first_extent_buffer(tree, start);
 447                         BUG_ON(!eb || eb->start != start);
 448                         ret = write_tree_block(trans, root, eb);
 449                         BUG_ON(ret);
 450                         start += eb->len;
 451                         clear_extent_buffer_dirty(eb);
 452                         free_extent_buffer(eb);
 453                 }
 454         }
 455         return 0;
 456 }
 457
 458 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 459                              struct btrfs_root *root)
 460 {
 461         u64 transid = trans->transid;
 462         int ret = 0;
 463         struct btrfs_fs_info *fs_info = root->fs_info;
 464
 465         if (root->commit_root == root->node)
 466                 goto commit_tree;
 467
 468         free_extent_buffer(root->commit_root);
 469         root->commit_root = NULL;
 470
 471         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 472         btrfs_set_root_generation(&root->root_item, trans->transid);
 473         root->root_item.level = btrfs_header_level(root->node);
 474         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 475                                 &root->root_key, &root->root_item);
 476         BUG_ON(ret);
 477 commit_tree:
 478         ret = commit_tree_roots(trans, fs_info);
 479         BUG_ON(ret);
 480         ret = __commit_transaction(trans, root);
 481         BUG_ON(ret);
 482         write_ctree_super(trans, root);
 483         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 484                                    &fs_info->pinned_extents);
 485         btrfs_free_transaction(root, trans);
 486         free_extent_buffer(root->commit_root);
 487         root->commit_root = NULL;
 488         fs_info->running_transaction = NULL;
 489         fs_info->last_trans_committed = transid;
 490         return 0;
 491 }
 492
 493 static int find_and_setup_root(struct btrfs_root *tree_root,
 494                                struct btrfs_fs_info *fs_info,
 495                                u64 objectid, struct btrfs_root *root)
 496 {
 497         int ret;
 498         u32 blocksize;
 499         u64 generation;
 500
 501         __setup_root(tree_root->nodesize, tree_root->leafsize,
 502                      tree_root->sectorsize, tree_root->stripesize,
 503                      root, fs_info, objectid);
 504         ret = btrfs_find_last_root(tree_root, objectid,
 505                                    &root->root_item, &root->root_key);
 506         if (ret)
 507                 return ret;
 508
 509         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 510         generation = btrfs_root_generation(&root->root_item);
 511         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 512                                      blocksize, generation);
 513         if (!extent_buffer_uptodate(root->node))
 514                 return -EIO;
 515
 516         return 0;
 517 }
 518
 519 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 520                                struct btrfs_fs_info *fs_info,
 521                                struct btrfs_super_block *disk_super)
 522 {
 523         u32 blocksize;
 524         u64 blocknr = btrfs_super_log_root(disk_super);
 525         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 526
 527         if (!log_root)
 528                 return -ENOMEM;
 529
 530         if (blocknr == 0) {
 531                 free(log_root);
 532                 return 0;
 533         }
 534
 535         blocksize = btrfs_level_size(tree_root,
 536                              btrfs_super_log_root_level(disk_super));
 537
 538         __setup_root(tree_root->nodesize, tree_root->leafsize,
 539                      tree_root->sectorsize, tree_root->stripesize,
 540                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 541
 542         log_root->node = read_tree_block(tree_root, blocknr,
 543                                      blocksize,
 544                                      btrfs_super_generation(disk_super) + 1);
 545
 546         fs_info->log_root_tree = log_root;
 547
 548         if (!extent_buffer_uptodate(log_root->node)) {
 549                 free_extent_buffer(log_root->node);
 550                 free(log_root);
 551                 fs_info->log_root_tree = NULL;
 552                 return -EIO;
 553         }
 554
 555         return 0;
 556 }
 557
 558
 559 int btrfs_free_fs_root(struct btrfs_root *root)
 560 {
 561         if (root->node)
 562                 free_extent_buffer(root->node);
 563         if (root->commit_root)
 564                 free_extent_buffer(root->commit_root);
 565         kfree(root);
 566         return 0;
 567 }
 568
 569 static void __free_fs_root(struct rb_node *node)
 570 {
 571         struct btrfs_root *root;
 572
 573         root = container_of(node, struct btrfs_root, rb_node);
 574         btrfs_free_fs_root(root);
 575 }
 576
 577 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
 578
 579 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 580                                                struct btrfs_key *location)
 581 {
 582         struct btrfs_root *root;
 583         struct btrfs_root *tree_root = fs_info->tree_root;
 584         struct btrfs_path *path;
 585         struct extent_buffer *l;
 586         u64 generation;
 587         u32 blocksize;
 588         int ret = 0;
 589
 590         root = malloc(sizeof(*root));
 591         if (!root)
 592                 return ERR_PTR(-ENOMEM);
 593         memset(root, 0, sizeof(*root));
 594         if (location->offset == (u64)-1) {
 595                 ret = find_and_setup_root(tree_root, fs_info,
 596                                           location->objectid, root);
 597                 if (ret) {
 598                         free(root);
 599                         return ERR_PTR(ret);
 600                 }
 601                 goto insert;
 602         }
 603
 604         __setup_root(tree_root->nodesize, tree_root->leafsize,
 605                      tree_root->sectorsize, tree_root->stripesize,
 606                      root, fs_info, location->objectid);
 607
 608         path = btrfs_alloc_path();
 609         BUG_ON(!path);
 610         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 611         if (ret != 0) {
 612                 if (ret > 0)
 613                         ret = -ENOENT;
 614                 goto out;
 615         }
 616         l = path->nodes[0];
 617         read_extent_buffer(l, &root->root_item,
 618                btrfs_item_ptr_offset(l, path->slots[0]),
 619                sizeof(root->root_item));
 620         memcpy(&root->root_key, location, sizeof(*location));
 621         ret = 0;
 622 out:
 623         btrfs_release_path(path);
 624         btrfs_free_path(path);
 625         if (ret) {
 626                 free(root);
 627                 return ERR_PTR(ret);
 628         }
 629         generation = btrfs_root_generation(&root->root_item);
 630         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 631         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 632                                      blocksize, generation);
 633         BUG_ON(!root->node);
 634 insert:
 635         root->ref_cows = 1;
 636         return root;
 637 }
 638
 639 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
 640                                             void *data)
 641 {
 642         u64 objectid = *((u64 *)data);
 643         struct btrfs_root *root;
 644
 645         root = rb_entry(node, struct btrfs_root, rb_node);
 646         if (objectid > root->objectid)
 647                 return 1;
 648         else if (objectid < root->objectid)
 649                 return -1;
 650         else
 651                 return 0;
 652 }
 653
 654 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
 655                                         struct rb_node *node2)
 656 {
 657         struct btrfs_root *root;
 658
 659         root = rb_entry(node2, struct btrfs_root, rb_node);
 660         return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
 661 }
 662
 663 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 664                                       struct btrfs_key *location)
 665 {
 666         struct btrfs_root *root;
 667         struct rb_node *node;
 668         int ret;
 669
 670         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 671                 return fs_info->tree_root;
 672         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 673                 return fs_info->extent_root;
 674         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 675                 return fs_info->chunk_root;
 676         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 677                 return fs_info->dev_root;
 678         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 679                 return fs_info->csum_root;
 680
 681         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 682                location->offset != (u64)-1);
 683
 684         node = rb_search(&fs_info->fs_root_tree, (void *)&location->objectid,
 685                          btrfs_fs_roots_compare_objectids, NULL);
 686         if (node)
 687                 return container_of(node, struct btrfs_root, rb_node);
 688
 689         root = btrfs_read_fs_root_no_cache(fs_info, location);
 690         if (IS_ERR(root))
 691                 return root;
 692
 693         ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
 694                         btrfs_fs_roots_compare_roots);
 695         BUG_ON(ret);
 696         return root;
 697 }
 698
 699 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 700 {
 701         free(fs_info->tree_root);
 702         free(fs_info->extent_root);
 703         free(fs_info->chunk_root);
 704         free(fs_info->dev_root);
 705         free(fs_info->csum_root);
 706         free(fs_info->super_copy);
 707         free(fs_info->log_root_tree);
 708         free(fs_info);
 709 }
 710
 711 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
 712 {
 713         struct btrfs_fs_info *fs_info;
 714
 715         fs_info = malloc(sizeof(struct btrfs_fs_info));
 716         if (!fs_info)
 717                 return NULL;
 718
 719         memset(fs_info, 0, sizeof(struct btrfs_fs_info));
 720
 721         fs_info->tree_root = malloc(sizeof(struct btrfs_root));
 722         fs_info->extent_root = malloc(sizeof(struct btrfs_root));
 723         fs_info->chunk_root = malloc(sizeof(struct btrfs_root));
 724         fs_info->dev_root = malloc(sizeof(struct btrfs_root));
 725         fs_info->csum_root = malloc(sizeof(struct btrfs_root));
 726         fs_info->super_copy = malloc(BTRFS_SUPER_INFO_SIZE);
 727
 728         if (!fs_info->tree_root || !fs_info->extent_root ||
 729             !fs_info->chunk_root || !fs_info->dev_root ||
 730             !fs_info->csum_root || !fs_info->super_copy)
 731                 goto free_all;
 732
 733         memset(fs_info->super_copy, 0, BTRFS_SUPER_INFO_SIZE);
 734         memset(fs_info->tree_root, 0, sizeof(struct btrfs_root));
 735         memset(fs_info->extent_root, 0, sizeof(struct btrfs_root));
 736         memset(fs_info->chunk_root, 0, sizeof(struct btrfs_root));
 737         memset(fs_info->dev_root, 0, sizeof(struct btrfs_root));
 738         memset(fs_info->csum_root, 0, sizeof(struct btrfs_root));
 739
 740         extent_io_tree_init(&fs_info->extent_cache);
 741         extent_io_tree_init(&fs_info->free_space_cache);
 742         extent_io_tree_init(&fs_info->block_group_cache);
 743         extent_io_tree_init(&fs_info->pinned_extents);
 744         extent_io_tree_init(&fs_info->pending_del);
 745         extent_io_tree_init(&fs_info->extent_ins);
 746         fs_info->fs_root_tree = RB_ROOT;
 747         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 748
 749         mutex_init(&fs_info->fs_mutex);
 750         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 751         INIT_LIST_HEAD(&fs_info->space_info);
 752
 753         if (!writable)
 754                 fs_info->readonly = 1;
 755
 756         fs_info->super_bytenr = sb_bytenr;
 757         fs_info->data_alloc_profile = (u64)-1;
 758         fs_info->metadata_alloc_profile = (u64)-1;
 759         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 760         return fs_info;
 761 free_all:
 762         btrfs_free_fs_info(fs_info);
 763         return NULL;
 764 }
 765
 766 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
 767 {
 768         u64 features;
 769
 770         features = btrfs_super_incompat_flags(sb) &
 771                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 772         if (features) {
 773                 printk("couldn't open because of unsupported "
 774                        "option features (%Lx).\n",
 775                        (unsigned long long)features);
 776                 return -ENOTSUP;
 777         }
 778
 779         features = btrfs_super_incompat_flags(sb);
 780         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 781                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 782                 btrfs_set_super_incompat_flags(sb, features);
 783         }
 784
 785         features = btrfs_super_compat_ro_flags(sb) &
 786                 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
 787         if (writable && features) {
 788                 printk("couldn't open RDWR because of unsupported "
 789                        "option features (%Lx).\n",
 790                        (unsigned long long)features);
 791                 return -ENOTSUP;
 792         }
 793         return 0;
 794 }
 795
 796 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info,
 797                           u64 root_tree_bytenr, int partial)
 798 {
 799         struct btrfs_super_block *sb = fs_info->super_copy;
 800         struct btrfs_root *root;
 801         struct btrfs_key key;
 802         u32 sectorsize;
 803         u32 nodesize;
 804         u32 leafsize;
 805         u32 stripesize;
 806         u64 generation;
 807         u32 blocksize;
 808         int ret;
 809
 810         nodesize = btrfs_super_nodesize(sb);
 811         leafsize = btrfs_super_leafsize(sb);
 812         sectorsize = btrfs_super_sectorsize(sb);
 813         stripesize = btrfs_super_stripesize(sb);
 814
 815         root = fs_info->tree_root;
 816         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 817                      root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
 818         blocksize = btrfs_level_size(root, btrfs_super_root_level(sb));
 819         generation = btrfs_super_generation(sb);
 820
 821         if (!root_tree_bytenr)
 822                 root_tree_bytenr = btrfs_super_root(sb);
 823         root->node = read_tree_block(root, root_tree_bytenr, blocksize,
 824                                      generation);
 825         if (!extent_buffer_uptodate(root->node)) {
 826                 fprintf(stderr, "Couldn't read tree root\n");
 827                 return -EIO;
 828         }
 829
 830         ret = find_and_setup_root(root, fs_info, BTRFS_EXTENT_TREE_OBJECTID,
 831                                   fs_info->extent_root);
 832         if (ret) {
 833                 printk("Couldn't setup extent tree\n");
 834                 return -EIO;
 835         }
 836         fs_info->extent_root->track_dirty = 1;
 837
 838         ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
 839                                   fs_info->dev_root);
 840         if (ret) {
 841                 printk("Couldn't setup device tree\n");
 842                 return -EIO;
 843         }
 844         fs_info->dev_root->track_dirty = 1;
 845
 846         ret = find_and_setup_root(root, fs_info, BTRFS_CSUM_TREE_OBJECTID,
 847                                   fs_info->csum_root);
 848         if (ret) {
 849                 printk("Couldn't setup csum tree\n");
 850                 if (!partial)
 851                         return -EIO;
 852         }
 853         fs_info->csum_root->track_dirty = 1;
 854
 855         ret = find_and_setup_log_root(root, fs_info, sb);
 856         if (ret) {
 857                 printk("Couldn't setup log root tree\n");
 858                 return -EIO;
 859         }
 860
 861         fs_info->generation = generation;
 862         fs_info->last_trans_committed = generation;
 863         btrfs_read_block_groups(fs_info->tree_root);
 864
 865         key.objectid = BTRFS_FS_TREE_OBJECTID;
 866         key.type = BTRFS_ROOT_ITEM_KEY;
 867         key.offset = (u64)-1;
 868         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
 869
 870         if (!fs_info->fs_root)
 871                 return -EIO;
 872         return 0;
 873 }
 874
 875 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
 876 {
 877         if (fs_info->csum_root)
 878                 free_extent_buffer(fs_info->csum_root->node);
 879         if (fs_info->dev_root)
 880                 free_extent_buffer(fs_info->dev_root->node);
 881         if (fs_info->extent_root)
 882                 free_extent_buffer(fs_info->extent_root->node);
 883         if (fs_info->tree_root)
 884                 free_extent_buffer(fs_info->tree_root->node);
 885         if (fs_info->log_root_tree)
 886                 free_extent_buffer(fs_info->log_root_tree->node);
 887         if (fs_info->chunk_root)
 888                 free_extent_buffer(fs_info->chunk_root->node);
 889 }
 890
 891 static void free_map_lookup(struct cache_extent *ce)
 892 {
 893         struct map_lookup *map;
 894
 895         map = container_of(ce, struct map_lookup, ce);
 896         kfree(map);
 897 }
 898
 899 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
 900
 901 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
 902 {
 903         free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
 904         extent_io_tree_cleanup(&fs_info->extent_cache);
 905         extent_io_tree_cleanup(&fs_info->free_space_cache);
 906         extent_io_tree_cleanup(&fs_info->block_group_cache);
 907         extent_io_tree_cleanup(&fs_info->pinned_extents);
 908         extent_io_tree_cleanup(&fs_info->pending_del);
 909         extent_io_tree_cleanup(&fs_info->extent_ins);
 910 }
 911
 912 int btrfs_scan_fs_devices(int fd, const char *path,
 913                           struct btrfs_fs_devices **fs_devices,
 914                           u64 sb_bytenr, int run_ioctl)
 915 {
 916         u64 total_devs;
 917         int ret;
 918         if (!sb_bytenr)
 919                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 920
 921         ret = btrfs_scan_one_device(fd, path, fs_devices,
 922                                     &total_devs, sb_bytenr);
 923         if (ret) {
 924                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 925                 return ret;
 926         }
 927
 928         if (total_devs != 1) {
 929                 ret = btrfs_scan_for_fsid(run_ioctl);
 930                 if (ret)
 931                         return ret;
 932         }
 933         return 0;
 934 }
 935
 936 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info)
 937 {
 938         struct btrfs_super_block *sb = fs_info->super_copy;
 939         u32 sectorsize;
 940         u32 nodesize;
 941         u32 leafsize;
 942         u32 blocksize;
 943         u32 stripesize;
 944         u64 generation;
 945         int ret;
 946
 947         nodesize = btrfs_super_nodesize(sb);
 948         leafsize = btrfs_super_leafsize(sb);
 949         sectorsize = btrfs_super_sectorsize(sb);
 950         stripesize = btrfs_super_stripesize(sb);
 951
 952         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 953                      fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 954
 955         ret = btrfs_read_sys_array(fs_info->chunk_root);
 956         if (ret)
 957                 return ret;
 958
 959         blocksize = btrfs_level_size(fs_info->chunk_root,
 960                                      btrfs_super_chunk_root_level(sb));
 961         generation = btrfs_super_chunk_root_generation(sb);
 962
 963         fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
 964                                                     btrfs_super_chunk_root(sb),
 965                                                     blocksize, generation);
 966         if (!fs_info->chunk_root->node ||
 967             !extent_buffer_uptodate(fs_info->chunk_root->node)) {
 968                 fprintf(stderr, "Couldn't read chunk root\n");
 969                 return -EIO;
 970         }
 971
 972         if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
 973                 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
 974                 if (ret) {
 975                         fprintf(stderr, "Couldn't read chunk tree\n");
 976                         return ret;
 977                 }
 978         }
 979         return 0;
 980 }
 981
 982 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
 983                                              u64 sb_bytenr,
 984                                              u64 root_tree_bytenr, int writes,
 985                                              int partial, int restore)
 986 {
 987         struct btrfs_fs_info *fs_info;
 988         struct btrfs_super_block *disk_super;
 989         struct btrfs_fs_devices *fs_devices = NULL;
 990         struct extent_buffer *eb;
 991         int ret;
 992
 993         if (sb_bytenr == 0)
 994                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 995
 996         /* try to drop all the caches */
 997         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
 998                 fprintf(stderr, "Warning, could not drop caches\n");
 999
1000         fs_info = btrfs_new_fs_info(writes, sb_bytenr);
1001         if (!fs_info) {
1002                 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1003                 return NULL;
1004         }
1005         if (restore)
1006                 fs_info->on_restoring = 1;
1007
1008         ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, 1);
1009         if (ret)
1010                 goto out;
1011
1012         fs_info->fs_devices = fs_devices;
1013         if (writes)
1014                 ret = btrfs_open_devices(fs_devices, O_RDWR);
1015         else
1016                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
1017         if (ret)
1018                 goto out_devices;
1019
1020
1021         disk_super = fs_info->super_copy;
1022         ret = btrfs_read_dev_super(fs_devices->latest_bdev,
1023                                    disk_super, sb_bytenr);
1024         if (ret) {
1025                 printk("No valid btrfs found\n");
1026                 goto out_devices;
1027         }
1028
1029         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1030
1031         ret = btrfs_check_fs_compatibility(fs_info->super_copy, writes);
1032         if (ret)
1033                 goto out_devices;
1034
1035         ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
1036         if (ret)
1037                 goto out_chunk;
1038
1039         eb = fs_info->chunk_root->node;
1040         read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1041                            (unsigned long)btrfs_header_chunk_tree_uuid(eb),
1042                            BTRFS_UUID_SIZE);
1043
1044         ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, partial);
1045         if (ret)
1046                 goto out_failed;
1047
1048         return fs_info;
1049
1050 out_failed:
1051         if (partial)
1052                 return fs_info;
1053 out_chunk:
1054         btrfs_release_all_roots(fs_info);
1055         btrfs_cleanup_all_caches(fs_info);
1056 out_devices:
1057         btrfs_close_devices(fs_devices);
1058 out:
1059         btrfs_free_fs_info(fs_info);
1060         return NULL;
1061 }
1062
1063 struct btrfs_fs_info *open_ctree_fs_info_restore(const char *filename,
1064                                          u64 sb_bytenr, u64 root_tree_bytenr,
1065                                          int writes, int partial)
1066 {
1067         int fp;
1068         struct btrfs_fs_info *info;
1069         int flags = O_CREAT | O_RDWR;
1070         int restore = 1;
1071
1072         if (!writes)
1073                 flags = O_RDONLY;
1074
1075         fp = open(filename, flags, 0600);
1076         if (fp < 0) {
1077                 fprintf (stderr, "Could not open %s\n", filename);
1078                 return NULL;
1079         }
1080         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1081                                writes, partial, restore);
1082         close(fp);
1083         return info;
1084 }
1085
1086 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1087                                          u64 sb_bytenr, u64 root_tree_bytenr,
1088                                          int writes, int partial)
1089 {
1090         int fp;
1091         struct btrfs_fs_info *info;
1092         int flags = O_CREAT | O_RDWR;
1093
1094         if (!writes)
1095                 flags = O_RDONLY;
1096
1097         fp = open(filename, flags, 0600);
1098         if (fp < 0) {
1099                 fprintf (stderr, "Could not open %s\n", filename);
1100                 return NULL;
1101         }
1102         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1103                                writes, partial, 0);
1104         close(fp);
1105         return info;
1106 }
1107
1108 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
1109 {
1110         struct btrfs_fs_info *info;
1111
1112         info = open_ctree_fs_info(filename, sb_bytenr, 0, writes, 0);
1113         if (!info)
1114                 return NULL;
1115         return info->fs_root;
1116 }
1117
1118 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1119                                  int writes)
1120 {
1121         struct btrfs_fs_info *info;
1122         info = __open_ctree_fd(fp, path, sb_bytenr, 0, writes, 0, 0);
1123         if (!info)
1124                 return NULL;
1125         return info->fs_root;
1126 }
1127
1128 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
1129 {
1130         u8 fsid[BTRFS_FSID_SIZE];
1131         int fsid_is_initialized = 0;
1132         struct btrfs_super_block buf;
1133         int i;
1134         int ret;
1135         u64 transid = 0;
1136         u64 bytenr;
1137
1138         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1139                 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
1140                 if (ret < sizeof(buf))
1141                         return -1;
1142
1143                 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
1144                     btrfs_super_magic(&buf) != BTRFS_MAGIC)
1145                         return -1;
1146
1147                 memcpy(sb, &buf, sizeof(*sb));
1148                 return 0;
1149         }
1150
1151         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1152                 bytenr = btrfs_sb_offset(i);
1153                 ret = pread64(fd, &buf, sizeof(buf), bytenr);
1154                 if (ret < sizeof(buf))
1155                         break;
1156
1157                 if (btrfs_super_bytenr(&buf) != bytenr )
1158                         continue;
1159                 /* if magic is NULL, the device was removed */
1160                 if (btrfs_super_magic(&buf) == 0 && i == 0)
1161                         return -1;
1162                 if (btrfs_super_magic(&buf) != BTRFS_MAGIC)
1163                         continue;
1164
1165                 if (!fsid_is_initialized) {
1166                         memcpy(fsid, buf.fsid, sizeof(fsid));
1167                         fsid_is_initialized = 1;
1168                 } else if (memcmp(fsid, buf.fsid, sizeof(fsid))) {
1169                         /*
1170                          * the superblocks (the original one and
1171                          * its backups) contain data of different
1172                          * filesystems -> the super cannot be trusted
1173                          */
1174                         continue;
1175                 }
1176
1177                 if (btrfs_super_generation(&buf) > transid) {
1178                         memcpy(sb, &buf, sizeof(*sb));
1179                         transid = btrfs_super_generation(&buf);
1180                 }
1181         }
1182
1183         return transid > 0 ? 0 : -1;
1184 }
1185
1186 static int write_dev_supers(struct btrfs_root *root,
1187                             struct btrfs_super_block *sb,
1188                             struct btrfs_device *device)
1189 {
1190         u64 bytenr;
1191         u32 crc;
1192         int i, ret;
1193
1194         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1195                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1196                 crc = ~(u32)0;
1197                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1198                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1199                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1200
1201                 /*
1202                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1203                  * zero filled, we can use it directly
1204                  */
1205                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1206                                 BTRFS_SUPER_INFO_SIZE,
1207                                 root->fs_info->super_bytenr);
1208                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1209                 return 0;
1210         }
1211
1212         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1213                 bytenr = btrfs_sb_offset(i);
1214                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1215                         break;
1216
1217                 btrfs_set_super_bytenr(sb, bytenr);
1218
1219                 crc = ~(u32)0;
1220                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1221                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1222                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1223
1224                 /*
1225                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1226                  * zero filled, we can use it directly
1227                  */
1228                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1229                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1230                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1231         }
1232
1233         return 0;
1234 }
1235
1236 int write_all_supers(struct btrfs_root *root)
1237 {
1238         struct list_head *cur;
1239         struct list_head *head = &root->fs_info->fs_devices->devices;
1240         struct btrfs_device *dev;
1241         struct btrfs_super_block *sb;
1242         struct btrfs_dev_item *dev_item;
1243         int ret;
1244         u64 flags;
1245
1246         sb = root->fs_info->super_copy;
1247         dev_item = &sb->dev_item;
1248         list_for_each(cur, head) {
1249                 dev = list_entry(cur, struct btrfs_device, dev_list);
1250                 if (!dev->writeable)
1251                         continue;
1252
1253                 btrfs_set_stack_device_generation(dev_item, 0);
1254                 btrfs_set_stack_device_type(dev_item, dev->type);
1255                 btrfs_set_stack_device_id(dev_item, dev->devid);
1256                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1257                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1258                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1259                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1260                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1261                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1262                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1263
1264                 flags = btrfs_super_flags(sb);
1265                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1266
1267                 ret = write_dev_supers(root, sb, dev);
1268                 BUG_ON(ret);
1269         }
1270         return 0;
1271 }
1272
1273 int write_ctree_super(struct btrfs_trans_handle *trans,
1274                       struct btrfs_root *root)
1275 {
1276         int ret;
1277         struct btrfs_root *tree_root = root->fs_info->tree_root;
1278         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1279
1280         if (root->fs_info->readonly)
1281                 return 0;
1282
1283         btrfs_set_super_generation(root->fs_info->super_copy,
1284                                    trans->transid);
1285         btrfs_set_super_root(root->fs_info->super_copy,
1286                              tree_root->node->start);
1287         btrfs_set_super_root_level(root->fs_info->super_copy,
1288                                    btrfs_header_level(tree_root->node));
1289         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1290                                    chunk_root->node->start);
1291         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1292                                          btrfs_header_level(chunk_root->node));
1293         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1294                                 btrfs_header_generation(chunk_root->node));
1295
1296         ret = write_all_supers(root);
1297         if (ret)
1298                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1299         return ret;
1300 }
1301
1302 int close_ctree(struct btrfs_root *root)
1303 {
1304         int ret;
1305         struct btrfs_trans_handle *trans;
1306         struct btrfs_fs_info *fs_info = root->fs_info;
1307
1308         if (fs_info->last_trans_committed !=
1309             fs_info->generation) {
1310                 trans = btrfs_start_transaction(root, 1);
1311                 btrfs_commit_transaction(trans, root);
1312                 trans = btrfs_start_transaction(root, 1);
1313                 ret = commit_tree_roots(trans, fs_info);
1314                 BUG_ON(ret);
1315                 ret = __commit_transaction(trans, root);
1316                 BUG_ON(ret);
1317                 write_ctree_super(trans, root);
1318                 btrfs_free_transaction(root, trans);
1319         }
1320         btrfs_free_block_groups(fs_info);
1321
1322         free_fs_roots_tree(&fs_info->fs_root_tree);
1323
1324         btrfs_release_all_roots(fs_info);
1325         btrfs_close_devices(fs_info->fs_devices);
1326         btrfs_cleanup_all_caches(fs_info);
1327         btrfs_free_fs_info(fs_info);
1328         return 0;
1329 }
1330
1331 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1332                      struct extent_buffer *eb)
1333 {
1334         return clear_extent_buffer_dirty(eb);
1335 }
1336
1337 int wait_on_tree_block_writeback(struct btrfs_root *root,
1338                                  struct extent_buffer *eb)
1339 {
1340         return 0;
1341 }
1342
1343 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1344 {
1345         set_extent_buffer_dirty(eb);
1346 }
1347
1348 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1349 {
1350         int ret;
1351
1352         ret = extent_buffer_uptodate(buf);
1353         if (!ret)
1354                 return ret;
1355
1356         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1357         return !ret;
1358 }
1359
1360 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1361 {
1362         return set_extent_buffer_uptodate(eb);
1363 }