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