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 close_all_devices(struct btrfs_fs_info *fs_info);
  39
  40 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
  41 {
  42
  43         struct btrfs_fs_devices *fs_devices;
  44         int ret = 1;
  45
  46         if (buf->start != btrfs_header_bytenr(buf)) {
  47                 printk("Check tree block failed, want=%Lu, have=%Lu\n",
  48                        buf->start, btrfs_header_bytenr(buf));
  49                 return ret;
  50         }
  51
  52         fs_devices = root->fs_info->fs_devices;
  53         while (fs_devices) {
  54                 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
  55                                           (unsigned long)btrfs_header_fsid(buf),
  56                                           BTRFS_FSID_SIZE)) {
  57                         ret = 0;
  58                         break;
  59                 }
  60                 fs_devices = fs_devices->seed;
  61         }
  62         return ret;
  63 }
  64
  65 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  66 {
  67         return crc32c(seed, data, len);
  68 }
  69
  70 void btrfs_csum_final(u32 crc, char *result)
  71 {
  72         *(__le32 *)result = ~cpu_to_le32(crc);
  73 }
  74
  75 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
  76                          int verify)
  77 {
  78         char *result;
  79         u32 len;
  80         u32 crc = ~(u32)0;
  81
  82         result = malloc(csum_size * sizeof(char));
  83         if (!result)
  84                 return 1;
  85
  86         len = buf->len - BTRFS_CSUM_SIZE;
  87         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  88         btrfs_csum_final(crc, result);
  89
  90         if (verify) {
  91                 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
  92                         printk("checksum verify failed on %llu found %X "
  93                                "wanted %X\n", (unsigned long long)buf->start,
  94                                *((int *)result), *((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(struct btrfs_root *root, struct extent_buffer *buf,
 106                     int verify)
 107 {
 108         u16 csum_size =
 109                 btrfs_super_csum_size(root->fs_info->super_copy);
 110         return csum_tree_block_size(buf, csum_size, verify);
 111 }
 112
 113 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 114                                             u64 bytenr, u32 blocksize)
 115 {
 116         return find_extent_buffer(&root->fs_info->extent_cache,
 117                                   bytenr, blocksize);
 118 }
 119
 120 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 121                                                  u64 bytenr, u32 blocksize)
 122 {
 123         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
 124                                    blocksize);
 125 }
 126
 127 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
 128                          u64 parent_transid)
 129 {
 130         int ret;
 131         struct extent_buffer *eb;
 132         u64 length;
 133         struct btrfs_multi_bio *multi = NULL;
 134         struct btrfs_device *device;
 135
 136         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 137         if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
 138                 free_extent_buffer(eb);
 139                 return 0;
 140         }
 141
 142         length = blocksize;
 143         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 144                               bytenr, &length, &multi, 0, NULL);
 145         BUG_ON(ret);
 146         device = multi->stripes[0].dev;
 147         device->total_ios++;
 148         blocksize = min(blocksize, (u32)(64 * 1024));
 149         readahead(device->fd, multi->stripes[0].physical, blocksize);
 150         kfree(multi);
 151         return 0;
 152 }
 153
 154 static int verify_parent_transid(struct extent_io_tree *io_tree,
 155                                  struct extent_buffer *eb, u64 parent_transid,
 156                                  int ignore)
 157 {
 158         int ret;
 159
 160         if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
 161                 return 0;
 162
 163         if (extent_buffer_uptodate(eb) &&
 164             btrfs_header_generation(eb) == parent_transid) {
 165                 ret = 0;
 166                 goto out;
 167         }
 168         printk("parent transid verify failed on %llu wanted %llu found %llu\n",
 169                (unsigned long long)eb->start,
 170                (unsigned long long)parent_transid,
 171                (unsigned long long)btrfs_header_generation(eb));
 172         if (ignore) {
 173                 printk("Ignoring transid failure\n");
 174                 return 0;
 175         }
 176
 177         ret = 1;
 178 out:
 179         clear_extent_buffer_uptodate(io_tree, eb);
 180         return ret;
 181
 182 }
 183
 184
 185 static int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
 186 {
 187         unsigned long offset = 0;
 188         struct btrfs_multi_bio *multi = NULL;
 189         struct btrfs_device *device;
 190         int ret = 0;
 191         u64 read_len;
 192         unsigned long bytes_left = eb->len;
 193
 194         while (bytes_left) {
 195                 read_len = bytes_left;
 196                 ret = btrfs_map_block(&info->mapping_tree, READ,
 197                                       eb->start + offset, &read_len, &multi,
 198                                       mirror, NULL);
 199                 if (ret) {
 200                         printk("Couldn't map the block %Lu\n", eb->start + offset);
 201                         kfree(multi);
 202                         return -EIO;
 203                 }
 204                 device = multi->stripes[0].dev;
 205
 206                 if (device->fd == 0) {
 207                         kfree(multi);
 208                         return -EIO;
 209                 }
 210
 211                 eb->fd = device->fd;
 212                 device->total_ios++;
 213                 eb->dev_bytenr = multi->stripes[0].physical;
 214                 kfree(multi);
 215                 multi = NULL;
 216
 217                 if (read_len > bytes_left)
 218                         read_len = bytes_left;
 219
 220                 ret = read_extent_from_disk(eb, offset, read_len);
 221                 if (ret)
 222                         return -EIO;
 223                 offset += read_len;
 224                 bytes_left -= read_len;
 225         }
 226         return 0;
 227 }
 228
 229 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 230                                      u32 blocksize, u64 parent_transid)
 231 {
 232         int ret;
 233         struct extent_buffer *eb;
 234         u64 best_transid = 0;
 235         int mirror_num = 0;
 236         int good_mirror = 0;
 237         int num_copies;
 238         int ignore = 0;
 239
 240         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 241         if (!eb)
 242                 return NULL;
 243
 244         if (btrfs_buffer_uptodate(eb, parent_transid))
 245                 return eb;
 246
 247         while (1) {
 248                 ret = read_whole_eb(root->fs_info, eb, mirror_num);
 249                 if (ret == 0 && check_tree_block(root, eb) == 0 &&
 250                     csum_tree_block(root, eb, 1) == 0 &&
 251                     verify_parent_transid(eb->tree, eb, parent_transid, ignore)
 252                     == 0) {
 253                         btrfs_set_buffer_uptodate(eb);
 254                         return eb;
 255                 }
 256                 if (ignore) {
 257                         if (check_tree_block(root, eb))
 258                                 printk("read block failed check_tree_block\n");
 259                         else
 260                                 printk("Csum didn't match\n");
 261                         break;
 262                 }
 263                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 264                                               eb->start, eb->len);
 265                 if (num_copies == 1) {
 266                         ignore = 1;
 267                         continue;
 268                 }
 269                 if (btrfs_header_generation(eb) > best_transid) {
 270                         best_transid = btrfs_header_generation(eb);
 271                         good_mirror = mirror_num;
 272                 }
 273                 mirror_num++;
 274                 if (mirror_num > num_copies) {
 275                         mirror_num = good_mirror;
 276                         ignore = 1;
 277                         continue;
 278                 }
 279         }
 280         free_extent_buffer(eb);
 281         return NULL;
 282 }
 283
 284 static int rmw_eb(struct btrfs_fs_info *info,
 285                   struct extent_buffer *eb, struct extent_buffer *orig_eb)
 286 {
 287         int ret;
 288         unsigned long orig_off = 0;
 289         unsigned long dest_off = 0;
 290         unsigned long copy_len = eb->len;
 291
 292         ret = read_whole_eb(info, eb, 0);
 293         if (ret)
 294                 return ret;
 295
 296         if (eb->start + eb->len <= orig_eb->start ||
 297             eb->start >= orig_eb->start + orig_eb->len)
 298                 return 0;
 299         /*
 300          * | ----- orig_eb ------- |
 301          *         | ----- stripe -------  |
 302          *         | ----- orig_eb ------- |
 303          *              | ----- orig_eb ------- |
 304          */
 305         if (eb->start > orig_eb->start)
 306                 orig_off = eb->start - orig_eb->start;
 307         if (orig_eb->start > eb->start)
 308                 dest_off = orig_eb->start - eb->start;
 309
 310         if (copy_len > orig_eb->len - orig_off)
 311                 copy_len = orig_eb->len - orig_off;
 312         if (copy_len > eb->len - dest_off)
 313                 copy_len = eb->len - dest_off;
 314
 315         memcpy(eb->data + dest_off, orig_eb->data + orig_off, copy_len);
 316         return 0;
 317 }
 318
 319 static void split_eb_for_raid56(struct btrfs_fs_info *info,
 320                                 struct extent_buffer *orig_eb,
 321                                struct extent_buffer **ebs,
 322                                u64 stripe_len, u64 *raid_map,
 323                                int num_stripes)
 324 {
 325         struct extent_buffer *eb;
 326         u64 start = orig_eb->start;
 327         u64 this_eb_start;
 328         int i;
 329         int ret;
 330
 331         for (i = 0; i < num_stripes; i++) {
 332                 if (raid_map[i] >= BTRFS_RAID5_P_STRIPE)
 333                         break;
 334
 335                 eb = malloc(sizeof(struct extent_buffer) + stripe_len);
 336                 if (!eb)
 337                         BUG();
 338                 memset(eb, 0, sizeof(struct extent_buffer) + stripe_len);
 339
 340                 eb->start = raid_map[i];
 341                 eb->len = stripe_len;
 342                 eb->refs = 1;
 343                 eb->flags = 0;
 344                 eb->fd = -1;
 345                 eb->dev_bytenr = (u64)-1;
 346
 347                 this_eb_start = raid_map[i];
 348
 349                 if (start > this_eb_start ||
 350                     start + orig_eb->len < this_eb_start + stripe_len) {
 351                         ret = rmw_eb(info, eb, orig_eb);
 352                         BUG_ON(ret);
 353                 } else {
 354                         memcpy(eb->data, orig_eb->data + eb->start - start, stripe_len);
 355                 }
 356                 ebs[i] = eb;
 357         }
 358 }
 359
 360 static int write_raid56_with_parity(struct btrfs_fs_info *info,
 361                                     struct extent_buffer *eb,
 362                                     struct btrfs_multi_bio *multi,
 363                                     u64 stripe_len, u64 *raid_map)
 364 {
 365         struct extent_buffer *ebs[multi->num_stripes], *p_eb = NULL, *q_eb = NULL;
 366         int i;
 367         int j;
 368         int ret;
 369         int alloc_size = eb->len;
 370
 371         if (stripe_len > alloc_size)
 372                 alloc_size = stripe_len;
 373
 374         split_eb_for_raid56(info, eb, ebs, stripe_len, raid_map,
 375                             multi->num_stripes);
 376
 377         for (i = 0; i < multi->num_stripes; i++) {
 378                 struct extent_buffer *new_eb;
 379                 if (raid_map[i] < BTRFS_RAID5_P_STRIPE) {
 380                         ebs[i]->dev_bytenr = multi->stripes[i].physical;
 381                         ebs[i]->fd = multi->stripes[i].dev->fd;
 382                         multi->stripes[i].dev->total_ios++;
 383                         BUG_ON(ebs[i]->start != raid_map[i]);
 384                         continue;
 385                 }
 386                 new_eb = kmalloc(sizeof(*eb) + alloc_size, GFP_NOFS);
 387                 BUG_ON(!new_eb);
 388                 new_eb->dev_bytenr = multi->stripes[i].physical;
 389                 new_eb->fd = multi->stripes[i].dev->fd;
 390                 multi->stripes[i].dev->total_ios++;
 391                 new_eb->len = stripe_len;
 392
 393                 if (raid_map[i] == BTRFS_RAID5_P_STRIPE)
 394                         p_eb = new_eb;
 395                 else if (raid_map[i] == BTRFS_RAID6_Q_STRIPE)
 396                         q_eb = new_eb;
 397         }
 398         if (q_eb) {
 399                 void *pointers[multi->num_stripes];
 400                 ebs[multi->num_stripes - 2] = p_eb;
 401                 ebs[multi->num_stripes - 1] = q_eb;
 402
 403                 for (i = 0; i < multi->num_stripes; i++)
 404                         pointers[i] = ebs[i]->data;
 405
 406                 raid6_gen_syndrome(multi->num_stripes, stripe_len, pointers);
 407         } else {
 408                 ebs[multi->num_stripes - 1] = p_eb;
 409                 memcpy(p_eb->data, ebs[0]->data, stripe_len);
 410                 for (j = 1; j < multi->num_stripes - 1; j++) {
 411                         for (i = 0; i < stripe_len; i += sizeof(unsigned long)) {
 412                                 *(unsigned long *)(p_eb->data + i) ^=
 413                                         *(unsigned long *)(ebs[j]->data + i);
 414                         }
 415                 }
 416         }
 417
 418         for (i = 0; i < multi->num_stripes; i++) {
 419                 ret = write_extent_to_disk(ebs[i]);
 420                 BUG_ON(ret);
 421                 if (ebs[i] != eb)
 422                         kfree(ebs[i]);
 423         }
 424         return 0;
 425 }
 426
 427 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 428                      struct extent_buffer *eb)
 429 {
 430         int ret;
 431         int dev_nr;
 432         u64 length;
 433         u64 *raid_map = NULL;
 434         struct btrfs_multi_bio *multi = NULL;
 435
 436         if (check_tree_block(root, eb))
 437                 BUG();
 438         if (!btrfs_buffer_uptodate(eb, trans->transid))
 439                 BUG();
 440
 441         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 442         csum_tree_block(root, eb, 0);
 443
 444         dev_nr = 0;
 445         length = eb->len;
 446         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 447                               eb->start, &length, &multi, 0, &raid_map);
 448
 449         if (raid_map) {
 450                 ret = write_raid56_with_parity(root->fs_info, eb, multi,
 451                                                length, raid_map);
 452                 BUG_ON(ret);
 453         } else while (dev_nr < multi->num_stripes) {
 454                 BUG_ON(ret);
 455                 eb->fd = multi->stripes[dev_nr].dev->fd;
 456                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 457                 multi->stripes[dev_nr].dev->total_ios++;
 458                 dev_nr++;
 459                 ret = write_extent_to_disk(eb);
 460                 BUG_ON(ret);
 461         }
 462         kfree(multi);
 463         return 0;
 464 }
 465
 466 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 467                         u32 stripesize, struct btrfs_root *root,
 468                         struct btrfs_fs_info *fs_info, u64 objectid)
 469 {
 470         root->node = NULL;
 471         root->commit_root = NULL;
 472         root->sectorsize = sectorsize;
 473         root->nodesize = nodesize;
 474         root->leafsize = leafsize;
 475         root->stripesize = stripesize;
 476         root->ref_cows = 0;
 477         root->track_dirty = 0;
 478
 479         root->fs_info = fs_info;
 480         root->objectid = objectid;
 481         root->last_trans = 0;
 482         root->highest_inode = 0;
 483         root->last_inode_alloc = 0;
 484
 485         INIT_LIST_HEAD(&root->dirty_list);
 486         memset(&root->root_key, 0, sizeof(root->root_key));
 487         memset(&root->root_item, 0, sizeof(root->root_item));
 488         root->root_key.objectid = objectid;
 489         return 0;
 490 }
 491
 492 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 493                                struct btrfs_root *root)
 494 {
 495         int ret;
 496         u64 old_root_bytenr;
 497         struct btrfs_root *tree_root = root->fs_info->tree_root;
 498
 499         btrfs_write_dirty_block_groups(trans, root);
 500         while(1) {
 501                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 502                 if (old_root_bytenr == root->node->start)
 503                         break;
 504                 btrfs_set_root_bytenr(&root->root_item,
 505                                        root->node->start);
 506                 btrfs_set_root_generation(&root->root_item,
 507                                           trans->transid);
 508                 root->root_item.level = btrfs_header_level(root->node);
 509                 ret = btrfs_update_root(trans, tree_root,
 510                                         &root->root_key,
 511                                         &root->root_item);
 512                 BUG_ON(ret);
 513                 btrfs_write_dirty_block_groups(trans, root);
 514         }
 515         return 0;
 516 }
 517
 518 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 519                              struct btrfs_fs_info *fs_info)
 520 {
 521         struct btrfs_root *root;
 522         struct list_head *next;
 523         struct extent_buffer *eb;
 524         int ret;
 525
 526         if (fs_info->readonly)
 527                 return 0;
 528
 529         eb = fs_info->tree_root->node;
 530         extent_buffer_get(eb);
 531         ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 532         free_extent_buffer(eb);
 533         if (ret)
 534                 return ret;
 535
 536         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 537                 next = fs_info->dirty_cowonly_roots.next;
 538                 list_del_init(next);
 539                 root = list_entry(next, struct btrfs_root, dirty_list);
 540                 update_cowonly_root(trans, root);
 541         }
 542         return 0;
 543 }
 544
 545 static int __commit_transaction(struct btrfs_trans_handle *trans,
 546                                 struct btrfs_root *root)
 547 {
 548         u64 start;
 549         u64 end;
 550         struct extent_buffer *eb;
 551         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 552         int ret;
 553
 554         while(1) {
 555                 ret = find_first_extent_bit(tree, 0, &start, &end,
 556                                             EXTENT_DIRTY);
 557                 if (ret)
 558                         break;
 559                 while(start <= end) {
 560                         eb = find_first_extent_buffer(tree, start);
 561                         BUG_ON(!eb || eb->start != start);
 562                         ret = write_tree_block(trans, root, eb);
 563                         BUG_ON(ret);
 564                         start += eb->len;
 565                         clear_extent_buffer_dirty(eb);
 566                         free_extent_buffer(eb);
 567                 }
 568         }
 569         return 0;
 570 }
 571
 572 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 573                              struct btrfs_root *root)
 574 {
 575         u64 transid = trans->transid;
 576         int ret = 0;
 577         struct btrfs_fs_info *fs_info = root->fs_info;
 578
 579         if (root->commit_root == root->node)
 580                 goto commit_tree;
 581
 582         free_extent_buffer(root->commit_root);
 583         root->commit_root = NULL;
 584
 585         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 586         btrfs_set_root_generation(&root->root_item, trans->transid);
 587         root->root_item.level = btrfs_header_level(root->node);
 588         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 589                                 &root->root_key, &root->root_item);
 590         BUG_ON(ret);
 591 commit_tree:
 592         ret = commit_tree_roots(trans, fs_info);
 593         BUG_ON(ret);
 594         ret = __commit_transaction(trans, root);
 595         BUG_ON(ret);
 596         write_ctree_super(trans, root);
 597         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 598                                    &fs_info->pinned_extents);
 599         btrfs_free_transaction(root, trans);
 600         free_extent_buffer(root->commit_root);
 601         root->commit_root = NULL;
 602         fs_info->running_transaction = NULL;
 603         fs_info->last_trans_committed = transid;
 604         return 0;
 605 }
 606
 607 static int find_and_setup_root(struct btrfs_root *tree_root,
 608                                struct btrfs_fs_info *fs_info,
 609                                u64 objectid, struct btrfs_root *root)
 610 {
 611         int ret;
 612         u32 blocksize;
 613         u64 generation;
 614
 615         __setup_root(tree_root->nodesize, tree_root->leafsize,
 616                      tree_root->sectorsize, tree_root->stripesize,
 617                      root, fs_info, objectid);
 618         ret = btrfs_find_last_root(tree_root, objectid,
 619                                    &root->root_item, &root->root_key);
 620         if (ret)
 621                 return ret;
 622
 623         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 624         generation = btrfs_root_generation(&root->root_item);
 625         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 626                                      blocksize, generation);
 627         if (!extent_buffer_uptodate(root->node))
 628                 return -EIO;
 629
 630         return 0;
 631 }
 632
 633 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 634                                struct btrfs_fs_info *fs_info,
 635                                struct btrfs_super_block *disk_super)
 636 {
 637         u32 blocksize;
 638         u64 blocknr = btrfs_super_log_root(disk_super);
 639         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 640
 641         if (!log_root)
 642                 return -ENOMEM;
 643
 644         if (blocknr == 0) {
 645                 free(log_root);
 646                 return 0;
 647         }
 648
 649         blocksize = btrfs_level_size(tree_root,
 650                              btrfs_super_log_root_level(disk_super));
 651
 652         __setup_root(tree_root->nodesize, tree_root->leafsize,
 653                      tree_root->sectorsize, tree_root->stripesize,
 654                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 655
 656         log_root->node = read_tree_block(tree_root, blocknr,
 657                                      blocksize,
 658                                      btrfs_super_generation(disk_super) + 1);
 659
 660         fs_info->log_root_tree = log_root;
 661
 662         if (!extent_buffer_uptodate(log_root->node)) {
 663                 free_extent_buffer(log_root->node);
 664                 free(log_root);
 665                 fs_info->log_root_tree = NULL;
 666                 return -EIO;
 667         }
 668
 669         return 0;
 670 }
 671
 672
 673 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info,
 674                        struct btrfs_root *root)
 675 {
 676         if (root->node)
 677                 free_extent_buffer(root->node);
 678         if (root->commit_root)
 679                 free_extent_buffer(root->commit_root);
 680         kfree(root);
 681         return 0;
 682 }
 683
 684 static int free_fs_roots(struct btrfs_fs_info *fs_info)
 685 {
 686         struct cache_extent *cache;
 687         struct btrfs_root *root;
 688
 689         while (1) {
 690                 cache = find_first_cache_extent(&fs_info->fs_root_cache, 0);
 691                 if (!cache)
 692                         break;
 693                 root = container_of(cache, struct btrfs_root, cache);
 694                 remove_cache_extent(&fs_info->fs_root_cache, cache);
 695                 btrfs_free_fs_root(fs_info, root);
 696         }
 697         return 0;
 698 }
 699
 700 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 701                                                struct btrfs_key *location)
 702 {
 703         struct btrfs_root *root;
 704         struct btrfs_root *tree_root = fs_info->tree_root;
 705         struct btrfs_path *path;
 706         struct extent_buffer *l;
 707         u64 generation;
 708         u32 blocksize;
 709         int ret = 0;
 710
 711         root = malloc(sizeof(*root));
 712         if (!root)
 713                 return ERR_PTR(-ENOMEM);
 714         memset(root, 0, sizeof(*root));
 715         if (location->offset == (u64)-1) {
 716                 ret = find_and_setup_root(tree_root, fs_info,
 717                                           location->objectid, root);
 718                 if (ret) {
 719                         free(root);
 720                         return ERR_PTR(ret);
 721                 }
 722                 goto insert;
 723         }
 724
 725         __setup_root(tree_root->nodesize, tree_root->leafsize,
 726                      tree_root->sectorsize, tree_root->stripesize,
 727                      root, fs_info, location->objectid);
 728
 729         path = btrfs_alloc_path();
 730         BUG_ON(!path);
 731         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 732         if (ret != 0) {
 733                 if (ret > 0)
 734                         ret = -ENOENT;
 735                 goto out;
 736         }
 737         l = path->nodes[0];
 738         read_extent_buffer(l, &root->root_item,
 739                btrfs_item_ptr_offset(l, path->slots[0]),
 740                sizeof(root->root_item));
 741         memcpy(&root->root_key, location, sizeof(*location));
 742         ret = 0;
 743 out:
 744         btrfs_release_path(root, path);
 745         btrfs_free_path(path);
 746         if (ret) {
 747                 free(root);
 748                 return ERR_PTR(ret);
 749         }
 750         generation = btrfs_root_generation(&root->root_item);
 751         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 752         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 753                                      blocksize, generation);
 754         BUG_ON(!root->node);
 755 insert:
 756         root->ref_cows = 1;
 757         return root;
 758 }
 759
 760 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 761                                       struct btrfs_key *location)
 762 {
 763         struct btrfs_root *root;
 764         struct cache_extent *cache;
 765         int ret;
 766
 767         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 768                 return fs_info->tree_root;
 769         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 770                 return fs_info->extent_root;
 771         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 772                 return fs_info->chunk_root;
 773         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 774                 return fs_info->dev_root;
 775         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 776                 return fs_info->csum_root;
 777
 778         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 779                location->offset != (u64)-1);
 780
 781         cache = find_cache_extent(&fs_info->fs_root_cache,
 782                                   location->objectid, 1);
 783         if (cache)
 784                 return container_of(cache, struct btrfs_root, cache);
 785
 786         root = btrfs_read_fs_root_no_cache(fs_info, location);
 787         if (IS_ERR(root))
 788                 return root;
 789
 790         root->cache.start = location->objectid;
 791         root->cache.size = 1;
 792         ret = insert_existing_cache_extent(&fs_info->fs_root_cache,
 793                                            &root->cache);
 794         BUG_ON(ret);
 795         return root;
 796 }
 797
 798 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
 799                                              u64 sb_bytenr,
 800                                              u64 root_tree_bytenr, int writes,
 801                                              int partial)
 802 {
 803         u32 sectorsize;
 804         u32 nodesize;
 805         u32 leafsize;
 806         u32 blocksize;
 807         u32 stripesize;
 808         u64 generation;
 809         struct btrfs_key key;
 810         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 811         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 812         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 813         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 814         struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
 815         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 816         int ret;
 817         struct btrfs_super_block *disk_super;
 818         struct btrfs_fs_devices *fs_devices = NULL;
 819         u64 total_devs;
 820         u64 features;
 821
 822         if (sb_bytenr == 0)
 823                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 824
 825         /* try to drop all the caches */
 826         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
 827                 fprintf(stderr, "Warning, could not drop caches\n");
 828
 829         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 830                                     &total_devs, sb_bytenr);
 831
 832         if (ret) {
 833                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 834                 goto out;
 835         }
 836
 837         if (total_devs != 1) {
 838                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 839                 if (ret)
 840                         goto out;
 841         }
 842
 843         memset(fs_info, 0, sizeof(*fs_info));
 844         fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
 845         fs_info->tree_root = tree_root;
 846         fs_info->extent_root = extent_root;
 847         fs_info->chunk_root = chunk_root;
 848         fs_info->dev_root = dev_root;
 849         fs_info->csum_root = csum_root;
 850
 851         if (!writes)
 852                 fs_info->readonly = 1;
 853
 854         extent_io_tree_init(&fs_info->extent_cache);
 855         extent_io_tree_init(&fs_info->free_space_cache);
 856         extent_io_tree_init(&fs_info->block_group_cache);
 857         extent_io_tree_init(&fs_info->pinned_extents);
 858         extent_io_tree_init(&fs_info->pending_del);
 859         extent_io_tree_init(&fs_info->extent_ins);
 860         cache_tree_init(&fs_info->fs_root_cache);
 861
 862         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 863
 864         mutex_init(&fs_info->fs_mutex);
 865         fs_info->fs_devices = fs_devices;
 866         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 867         INIT_LIST_HEAD(&fs_info->space_info);
 868
 869         __setup_root(4096, 4096, 4096, 4096, tree_root,
 870                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 871
 872         if (writes)
 873                 ret = btrfs_open_devices(fs_devices, O_RDWR);
 874         else
 875                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
 876         if (ret)
 877                 goto out_cleanup;
 878
 879         fs_info->super_bytenr = sb_bytenr;
 880         disk_super = fs_info->super_copy;
 881         ret = btrfs_read_dev_super(fs_devices->latest_bdev,
 882                                    disk_super, sb_bytenr);
 883         if (ret) {
 884                 printk("No valid btrfs found\n");
 885                 goto out_devices;
 886         }
 887
 888         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
 889
 890
 891         features = btrfs_super_incompat_flags(disk_super) &
 892                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 893         if (features) {
 894                 printk("couldn't open because of unsupported "
 895                        "option features (%Lx).\n",
 896                        (unsigned long long)features);
 897                 goto out_devices;
 898         }
 899
 900         features = btrfs_super_incompat_flags(disk_super);
 901         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 902                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 903                 btrfs_set_super_incompat_flags(disk_super, features);
 904         }
 905
 906         features = btrfs_super_compat_ro_flags(disk_super) &
 907                 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
 908         if (writes && features) {
 909                 printk("couldn't open RDWR because of unsupported "
 910                        "option features (%Lx).\n",
 911                        (unsigned long long)features);
 912                 goto out_devices;
 913         }
 914
 915         nodesize = btrfs_super_nodesize(disk_super);
 916         leafsize = btrfs_super_leafsize(disk_super);
 917         sectorsize = btrfs_super_sectorsize(disk_super);
 918         stripesize = btrfs_super_stripesize(disk_super);
 919         tree_root->nodesize = nodesize;
 920         tree_root->leafsize = leafsize;
 921         tree_root->sectorsize = sectorsize;
 922         tree_root->stripesize = stripesize;
 923
 924         ret = btrfs_read_sys_array(tree_root);
 925         if (ret)
 926                 goto out_devices;
 927         blocksize = btrfs_level_size(tree_root,
 928                                      btrfs_super_chunk_root_level(disk_super));
 929         generation = btrfs_super_chunk_root_generation(disk_super);
 930
 931         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 932                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 933
 934         chunk_root->node = read_tree_block(chunk_root,
 935                                            btrfs_super_chunk_root(disk_super),
 936                                            blocksize, generation);
 937         if (!extent_buffer_uptodate(chunk_root->node)) {
 938                 printk("Couldn't read chunk root\n");
 939                 goto out_devices;
 940         }
 941
 942         read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
 943                  (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
 944                  BTRFS_UUID_SIZE);
 945
 946         if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
 947                 ret = btrfs_read_chunk_tree(chunk_root);
 948                 if (ret)
 949                         goto out_failed;
 950         }
 951
 952         blocksize = btrfs_level_size(tree_root,
 953                                      btrfs_super_root_level(disk_super));
 954         generation = btrfs_super_generation(disk_super);
 955
 956         if (!root_tree_bytenr)
 957                 root_tree_bytenr = btrfs_super_root(disk_super);
 958         tree_root->node = read_tree_block(tree_root,
 959                                           root_tree_bytenr,
 960                                           blocksize, generation);
 961         if (!extent_buffer_uptodate(tree_root->node)) {
 962                 printk("Couldn't read tree root\n");
 963                 goto out_failed;
 964         }
 965         ret = find_and_setup_root(tree_root, fs_info,
 966                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 967         if (ret) {
 968                 printk("Couldn't setup extent tree\n");
 969                 goto out_failed;
 970         }
 971         extent_root->track_dirty = 1;
 972
 973         ret = find_and_setup_root(tree_root, fs_info,
 974                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 975         if (ret) {
 976                 printk("Couldn't setup device tree\n");
 977                 goto out_failed;
 978         }
 979         dev_root->track_dirty = 1;
 980
 981         ret = find_and_setup_root(tree_root, fs_info,
 982                                   BTRFS_CSUM_TREE_OBJECTID, csum_root);
 983         if (ret) {
 984                 printk("Couldn't setup csum tree\n");
 985                 if (!partial)
 986                         goto out_failed;
 987         }
 988         csum_root->track_dirty = 1;
 989
 990         find_and_setup_log_root(tree_root, fs_info, disk_super);
 991
 992         fs_info->generation = generation;
 993         fs_info->last_trans_committed = generation;
 994         btrfs_read_block_groups(fs_info->tree_root);
 995
 996         key.objectid = BTRFS_FS_TREE_OBJECTID;
 997         key.type = BTRFS_ROOT_ITEM_KEY;
 998         key.offset = (u64)-1;
 999         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1000
1001         if (!fs_info->fs_root)
1002                 goto out_failed;
1003
1004         fs_info->data_alloc_profile = (u64)-1;
1005         fs_info->metadata_alloc_profile = (u64)-1;
1006         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1007
1008         return fs_info;
1009
1010 out_failed:
1011         if (partial)
1012                 return fs_info;
1013
1014         if (fs_info->csum_root)
1015                 free_extent_buffer(fs_info->csum_root->node);
1016         if (fs_info->dev_root)
1017                 free_extent_buffer(fs_info->dev_root->node);
1018         if (fs_info->extent_root)
1019                 free_extent_buffer(fs_info->extent_root->node);
1020         if (fs_info->tree_root)
1021                 free_extent_buffer(fs_info->tree_root->node);
1022         if (fs_info->chunk_root)
1023                 free_extent_buffer(fs_info->chunk_root->node);
1024 out_devices:
1025         close_all_devices(fs_info);
1026 out_cleanup:
1027         extent_io_tree_cleanup(&fs_info->extent_cache);
1028         extent_io_tree_cleanup(&fs_info->free_space_cache);
1029         extent_io_tree_cleanup(&fs_info->block_group_cache);
1030         extent_io_tree_cleanup(&fs_info->pinned_extents);
1031         extent_io_tree_cleanup(&fs_info->pending_del);
1032         extent_io_tree_cleanup(&fs_info->extent_ins);
1033 out:
1034         free(tree_root);
1035         free(extent_root);
1036         free(chunk_root);
1037         free(dev_root);
1038         free(csum_root);
1039         free(fs_info);
1040         return NULL;
1041 }
1042
1043 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1044                                          u64 sb_bytenr, int writes,
1045                                          int partial)
1046 {
1047         int fp;
1048         struct btrfs_fs_info *info;
1049         int flags = O_CREAT | O_RDWR;
1050
1051         if (!writes)
1052                 flags = O_RDONLY;
1053
1054         fp = open(filename, flags, 0600);
1055         if (fp < 0) {
1056                 fprintf (stderr, "Could not open %s\n", filename);
1057                 return NULL;
1058         }
1059         info = __open_ctree_fd(fp, filename, sb_bytenr, 0, writes, partial);
1060         close(fp);
1061         return info;
1062 }
1063
1064 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
1065 {
1066         struct btrfs_fs_info *info;
1067
1068         info = open_ctree_fs_info(filename, sb_bytenr, writes, 0);
1069         if (!info)
1070                 return NULL;
1071         return info->fs_root;
1072 }
1073
1074 struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
1075                                        u64 root_tree_bytenr)
1076 {
1077         int fp;
1078         struct btrfs_fs_info *info;
1079
1080
1081         fp = open(filename, O_RDONLY);
1082         if (fp < 0) {
1083                 fprintf (stderr, "Could not open %s\n", filename);
1084                 return NULL;
1085         }
1086         info = __open_ctree_fd(fp, filename, sb_bytenr,
1087                                root_tree_bytenr, 0, 0);
1088         close(fp);
1089
1090         if (!info)
1091                 return NULL;
1092         return info->fs_root;
1093 }
1094
1095 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1096                                  int writes)
1097 {
1098         struct btrfs_fs_info *info;
1099         info = __open_ctree_fd(fp, path, sb_bytenr, 0, writes, 0);
1100         if (!info)
1101                 return NULL;
1102         return info->fs_root;
1103 }
1104
1105 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
1106 {
1107         u8 fsid[BTRFS_FSID_SIZE];
1108         int fsid_is_initialized = 0;
1109         struct btrfs_super_block buf;
1110         int i;
1111         int ret;
1112         u64 transid = 0;
1113         u64 bytenr;
1114
1115         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1116                 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
1117                 if (ret < sizeof(buf))
1118                         return -1;
1119
1120                 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
1121                     buf.magic != cpu_to_le64(BTRFS_MAGIC))
1122                         return -1;
1123
1124                 memcpy(sb, &buf, sizeof(*sb));
1125                 return 0;
1126         }
1127
1128         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1129                 bytenr = btrfs_sb_offset(i);
1130                 ret = pread64(fd, &buf, sizeof(buf), bytenr);
1131                 if (ret < sizeof(buf))
1132                         break;
1133
1134                 if (btrfs_super_bytenr(&buf) != bytenr )
1135                         continue;
1136                 /* if magic is NULL, the device was removed */
1137                 if (buf.magic == 0 && i == 0)
1138                         return -1;
1139                 if (buf.magic != cpu_to_le64(BTRFS_MAGIC))
1140                         continue;
1141
1142                 if (!fsid_is_initialized) {
1143                         memcpy(fsid, buf.fsid, sizeof(fsid));
1144                         fsid_is_initialized = 1;
1145                 } else if (memcmp(fsid, buf.fsid, sizeof(fsid))) {
1146                         /*
1147                          * the superblocks (the original one and
1148                          * its backups) contain data of different
1149                          * filesystems -> the super cannot be trusted
1150                          */
1151                         continue;
1152                 }
1153
1154                 if (btrfs_super_generation(&buf) > transid) {
1155                         memcpy(sb, &buf, sizeof(*sb));
1156                         transid = btrfs_super_generation(&buf);
1157                 }
1158         }
1159
1160         return transid > 0 ? 0 : -1;
1161 }
1162
1163 int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
1164                      struct btrfs_device *device)
1165 {
1166         u64 bytenr;
1167         u32 crc;
1168         int i, ret;
1169
1170         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1171                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1172                 crc = ~(u32)0;
1173                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1174                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1175                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1176
1177                 /*
1178                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1179                  * zero filled, we can use it directly
1180                  */
1181                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1182                                 BTRFS_SUPER_INFO_SIZE,
1183                                 root->fs_info->super_bytenr);
1184                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1185                 return 0;
1186         }
1187
1188         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1189                 bytenr = btrfs_sb_offset(i);
1190                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1191                         break;
1192
1193                 btrfs_set_super_bytenr(sb, bytenr);
1194
1195                 crc = ~(u32)0;
1196                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1197                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1198                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1199
1200                 /*
1201                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1202                  * zero filled, we can use it directly
1203                  */
1204                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1205                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1206                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1207         }
1208
1209         return 0;
1210 }
1211
1212 int write_all_supers(struct btrfs_root *root)
1213 {
1214         struct list_head *cur;
1215         struct list_head *head = &root->fs_info->fs_devices->devices;
1216         struct btrfs_device *dev;
1217         struct btrfs_super_block *sb;
1218         struct btrfs_dev_item *dev_item;
1219         int ret;
1220         u64 flags;
1221
1222         sb = root->fs_info->super_copy;
1223         dev_item = &sb->dev_item;
1224         list_for_each(cur, head) {
1225                 dev = list_entry(cur, struct btrfs_device, dev_list);
1226                 if (!dev->writeable)
1227                         continue;
1228
1229                 btrfs_set_stack_device_generation(dev_item, 0);
1230                 btrfs_set_stack_device_type(dev_item, dev->type);
1231                 btrfs_set_stack_device_id(dev_item, dev->devid);
1232                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1233                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1234                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1235                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1236                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1237                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1238                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1239
1240                 flags = btrfs_super_flags(sb);
1241                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1242
1243                 ret = write_dev_supers(root, sb, dev);
1244                 BUG_ON(ret);
1245         }
1246         return 0;
1247 }
1248
1249 int write_ctree_super(struct btrfs_trans_handle *trans,
1250                       struct btrfs_root *root)
1251 {
1252         int ret;
1253         struct btrfs_root *tree_root = root->fs_info->tree_root;
1254         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1255
1256         if (root->fs_info->readonly)
1257                 return 0;
1258
1259         btrfs_set_super_generation(root->fs_info->super_copy,
1260                                    trans->transid);
1261         btrfs_set_super_root(root->fs_info->super_copy,
1262                              tree_root->node->start);
1263         btrfs_set_super_root_level(root->fs_info->super_copy,
1264                                    btrfs_header_level(tree_root->node));
1265         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1266                                    chunk_root->node->start);
1267         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1268                                          btrfs_header_level(chunk_root->node));
1269         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1270                                 btrfs_header_generation(chunk_root->node));
1271
1272         ret = write_all_supers(root);
1273         if (ret)
1274                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1275         return ret;
1276 }
1277
1278 static int close_all_devices(struct btrfs_fs_info *fs_info)
1279 {
1280         struct list_head *list;
1281         struct btrfs_device *device;
1282
1283         list = &fs_info->fs_devices->devices;
1284         while (!list_empty(list)) {
1285                 device = list_entry(list->next, struct btrfs_device, dev_list);
1286                 list_del_init(&device->dev_list);
1287                 if (device->fd) {
1288                         fsync(device->fd);
1289                         if (posix_fadvise(device->fd, 0, 0, POSIX_FADV_DONTNEED))
1290                                 fprintf(stderr, "Warning, could not drop caches\n");
1291                 }
1292                 close(device->fd);
1293                 kfree(device->name);
1294                 kfree(device->label);
1295                 kfree(device);
1296         }
1297         kfree(fs_info->fs_devices);
1298         return 0;
1299 }
1300
1301 static void free_mapping_cache(struct btrfs_fs_info *fs_info)
1302 {
1303         struct cache_tree *cache_tree = &fs_info->mapping_tree.cache_tree;
1304         struct cache_extent *ce;
1305         struct map_lookup *map;
1306
1307         while ((ce = find_first_cache_extent(cache_tree, 0))) {
1308                 map = container_of(ce, struct map_lookup, ce);
1309                 remove_cache_extent(cache_tree, ce);
1310                 kfree(map);
1311         }
1312 }
1313
1314 int close_ctree(struct btrfs_root *root)
1315 {
1316         int ret;
1317         struct btrfs_trans_handle *trans;
1318         struct btrfs_fs_info *fs_info = root->fs_info;
1319
1320         if (fs_info->last_trans_committed !=
1321             fs_info->generation) {
1322                 trans = btrfs_start_transaction(root, 1);
1323                 btrfs_commit_transaction(trans, root);
1324                 trans = btrfs_start_transaction(root, 1);
1325                 ret = commit_tree_roots(trans, fs_info);
1326                 BUG_ON(ret);
1327                 ret = __commit_transaction(trans, root);
1328                 BUG_ON(ret);
1329                 write_ctree_super(trans, root);
1330                 btrfs_free_transaction(root, trans);
1331         }
1332         btrfs_free_block_groups(fs_info);
1333
1334         free_fs_roots(fs_info);
1335
1336         if (fs_info->extent_root->node)
1337                 free_extent_buffer(fs_info->extent_root->node);
1338         if (fs_info->tree_root->node)
1339                 free_extent_buffer(fs_info->tree_root->node);
1340         if (fs_info->chunk_root->node)
1341                 free_extent_buffer(fs_info->chunk_root->node);
1342         if (fs_info->dev_root->node)
1343                 free_extent_buffer(fs_info->dev_root->node);
1344         if (fs_info->csum_root->node)
1345                 free_extent_buffer(fs_info->csum_root->node);
1346
1347         if (fs_info->log_root_tree) {
1348                 if (fs_info->log_root_tree->node)
1349                         free_extent_buffer(fs_info->log_root_tree->node);
1350                 free(fs_info->log_root_tree);
1351         }
1352
1353         close_all_devices(fs_info);
1354         free_mapping_cache(fs_info);
1355         extent_io_tree_cleanup(&fs_info->extent_cache);
1356         extent_io_tree_cleanup(&fs_info->free_space_cache);
1357         extent_io_tree_cleanup(&fs_info->block_group_cache);
1358         extent_io_tree_cleanup(&fs_info->pinned_extents);
1359         extent_io_tree_cleanup(&fs_info->pending_del);
1360         extent_io_tree_cleanup(&fs_info->extent_ins);
1361
1362         free(fs_info->tree_root);
1363         free(fs_info->extent_root);
1364         free(fs_info->chunk_root);
1365         free(fs_info->dev_root);
1366         free(fs_info->csum_root);
1367         free(fs_info);
1368
1369         return 0;
1370 }
1371
1372 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1373                      struct extent_buffer *eb)
1374 {
1375         return clear_extent_buffer_dirty(eb);
1376 }
1377
1378 int wait_on_tree_block_writeback(struct btrfs_root *root,
1379                                  struct extent_buffer *eb)
1380 {
1381         return 0;
1382 }
1383
1384 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1385 {
1386         set_extent_buffer_dirty(eb);
1387 }
1388
1389 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1390 {
1391         int ret;
1392
1393         ret = extent_buffer_uptodate(buf);
1394         if (!ret)
1395                 return ret;
1396
1397         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1398         return !ret;
1399 }
1400
1401 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1402 {
1403         return set_extent_buffer_uptodate(eb);
1404 }