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 %08X "
  93                                "wanted %08X\n", (unsigned long long)buf->start,
  94                                *((u32 *)result), *((u32*)(char *)buf->data));
  95                         free(result);
  96                         return 1;
  97                 }
  98         } else {
  99                 write_extent_buffer(buf, result, 0, csum_size);
 100         }
 101         free(result);
 102         return 0;
 103 }
 104
 105 int csum_tree_block(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                 free_extent_buffer(root->commit_root);
 542                 root->commit_root = NULL;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int __commit_transaction(struct btrfs_trans_handle *trans,
 549                                 struct btrfs_root *root)
 550 {
 551         u64 start;
 552         u64 end;
 553         struct extent_buffer *eb;
 554         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 555         int ret;
 556
 557         while(1) {
 558                 ret = find_first_extent_bit(tree, 0, &start, &end,
 559                                             EXTENT_DIRTY);
 560                 if (ret)
 561                         break;
 562                 while(start <= end) {
 563                         eb = find_first_extent_buffer(tree, start);
 564                         BUG_ON(!eb || eb->start != start);
 565                         ret = write_tree_block(trans, root, eb);
 566                         BUG_ON(ret);
 567                         start += eb->len;
 568                         clear_extent_buffer_dirty(eb);
 569                         free_extent_buffer(eb);
 570                 }
 571         }
 572         return 0;
 573 }
 574
 575 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 576                              struct btrfs_root *root)
 577 {
 578         u64 transid = trans->transid;
 579         int ret = 0;
 580         struct btrfs_fs_info *fs_info = root->fs_info;
 581
 582         if (root->commit_root == root->node)
 583                 goto commit_tree;
 584
 585         free_extent_buffer(root->commit_root);
 586         root->commit_root = NULL;
 587
 588         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 589         btrfs_set_root_generation(&root->root_item, trans->transid);
 590         root->root_item.level = btrfs_header_level(root->node);
 591         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 592                                 &root->root_key, &root->root_item);
 593         BUG_ON(ret);
 594 commit_tree:
 595         ret = commit_tree_roots(trans, fs_info);
 596         BUG_ON(ret);
 597         ret = __commit_transaction(trans, root);
 598         BUG_ON(ret);
 599         write_ctree_super(trans, root);
 600         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 601                                    &fs_info->pinned_extents);
 602         btrfs_free_transaction(root, trans);
 603         free_extent_buffer(root->commit_root);
 604         root->commit_root = NULL;
 605         fs_info->running_transaction = NULL;
 606         fs_info->last_trans_committed = transid;
 607         return 0;
 608 }
 609
 610 static int find_and_setup_root(struct btrfs_root *tree_root,
 611                                struct btrfs_fs_info *fs_info,
 612                                u64 objectid, struct btrfs_root *root)
 613 {
 614         int ret;
 615         u32 blocksize;
 616         u64 generation;
 617
 618         __setup_root(tree_root->nodesize, tree_root->leafsize,
 619                      tree_root->sectorsize, tree_root->stripesize,
 620                      root, fs_info, objectid);
 621         ret = btrfs_find_last_root(tree_root, objectid,
 622                                    &root->root_item, &root->root_key);
 623         if (ret)
 624                 return ret;
 625
 626         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 627         generation = btrfs_root_generation(&root->root_item);
 628         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 629                                      blocksize, generation);
 630         if (!extent_buffer_uptodate(root->node))
 631                 return -EIO;
 632
 633         return 0;
 634 }
 635
 636 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 637                                struct btrfs_fs_info *fs_info,
 638                                struct btrfs_super_block *disk_super)
 639 {
 640         u32 blocksize;
 641         u64 blocknr = btrfs_super_log_root(disk_super);
 642         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 643
 644         if (!log_root)
 645                 return -ENOMEM;
 646
 647         if (blocknr == 0) {
 648                 free(log_root);
 649                 return 0;
 650         }
 651
 652         blocksize = btrfs_level_size(tree_root,
 653                              btrfs_super_log_root_level(disk_super));
 654
 655         __setup_root(tree_root->nodesize, tree_root->leafsize,
 656                      tree_root->sectorsize, tree_root->stripesize,
 657                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 658
 659         log_root->node = read_tree_block(tree_root, blocknr,
 660                                      blocksize,
 661                                      btrfs_super_generation(disk_super) + 1);
 662
 663         fs_info->log_root_tree = log_root;
 664
 665         if (!extent_buffer_uptodate(log_root->node)) {
 666                 free_extent_buffer(log_root->node);
 667                 free(log_root);
 668                 fs_info->log_root_tree = NULL;
 669                 return -EIO;
 670         }
 671
 672         return 0;
 673 }
 674
 675
 676 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info,
 677                        struct btrfs_root *root)
 678 {
 679         if (root->node)
 680                 free_extent_buffer(root->node);
 681         if (root->commit_root)
 682                 free_extent_buffer(root->commit_root);
 683         kfree(root);
 684         return 0;
 685 }
 686
 687 static int free_fs_roots(struct btrfs_fs_info *fs_info)
 688 {
 689         struct cache_extent *cache;
 690         struct btrfs_root *root;
 691
 692         while (1) {
 693                 cache = find_first_cache_extent(&fs_info->fs_root_cache, 0);
 694                 if (!cache)
 695                         break;
 696                 root = container_of(cache, struct btrfs_root, cache);
 697                 remove_cache_extent(&fs_info->fs_root_cache, cache);
 698                 btrfs_free_fs_root(fs_info, root);
 699         }
 700         return 0;
 701 }
 702
 703 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 704                                                struct btrfs_key *location)
 705 {
 706         struct btrfs_root *root;
 707         struct btrfs_root *tree_root = fs_info->tree_root;
 708         struct btrfs_path *path;
 709         struct extent_buffer *l;
 710         u64 generation;
 711         u32 blocksize;
 712         int ret = 0;
 713
 714         root = malloc(sizeof(*root));
 715         if (!root)
 716                 return ERR_PTR(-ENOMEM);
 717         memset(root, 0, sizeof(*root));
 718         if (location->offset == (u64)-1) {
 719                 ret = find_and_setup_root(tree_root, fs_info,
 720                                           location->objectid, root);
 721                 if (ret) {
 722                         free(root);
 723                         return ERR_PTR(ret);
 724                 }
 725                 goto insert;
 726         }
 727
 728         __setup_root(tree_root->nodesize, tree_root->leafsize,
 729                      tree_root->sectorsize, tree_root->stripesize,
 730                      root, fs_info, location->objectid);
 731
 732         path = btrfs_alloc_path();
 733         BUG_ON(!path);
 734         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 735         if (ret != 0) {
 736                 if (ret > 0)
 737                         ret = -ENOENT;
 738                 goto out;
 739         }
 740         l = path->nodes[0];
 741         read_extent_buffer(l, &root->root_item,
 742                btrfs_item_ptr_offset(l, path->slots[0]),
 743                sizeof(root->root_item));
 744         memcpy(&root->root_key, location, sizeof(*location));
 745         ret = 0;
 746 out:
 747         btrfs_release_path(root, path);
 748         btrfs_free_path(path);
 749         if (ret) {
 750                 free(root);
 751                 return ERR_PTR(ret);
 752         }
 753         generation = btrfs_root_generation(&root->root_item);
 754         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 755         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 756                                      blocksize, generation);
 757         BUG_ON(!root->node);
 758 insert:
 759         root->ref_cows = 1;
 760         return root;
 761 }
 762
 763 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 764                                       struct btrfs_key *location)
 765 {
 766         struct btrfs_root *root;
 767         struct cache_extent *cache;
 768         int ret;
 769
 770         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 771                 return fs_info->tree_root;
 772         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 773                 return fs_info->extent_root;
 774         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 775                 return fs_info->chunk_root;
 776         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 777                 return fs_info->dev_root;
 778         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 779                 return fs_info->csum_root;
 780
 781         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 782                location->offset != (u64)-1);
 783
 784         cache = find_cache_extent(&fs_info->fs_root_cache,
 785                                   location->objectid, 1);
 786         if (cache)
 787                 return container_of(cache, struct btrfs_root, cache);
 788
 789         root = btrfs_read_fs_root_no_cache(fs_info, location);
 790         if (IS_ERR(root))
 791                 return root;
 792
 793         root->cache.start = location->objectid;
 794         root->cache.size = 1;
 795         ret = insert_existing_cache_extent(&fs_info->fs_root_cache,
 796                                            &root->cache);
 797         BUG_ON(ret);
 798         return root;
 799 }
 800
 801 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
 802                                              u64 sb_bytenr,
 803                                              u64 root_tree_bytenr, int writes,
 804                                              int partial)
 805 {
 806         u32 sectorsize;
 807         u32 nodesize;
 808         u32 leafsize;
 809         u32 blocksize;
 810         u32 stripesize;
 811         u64 generation;
 812         struct btrfs_key key;
 813         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 814         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 815         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 816         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 817         struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
 818         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 819         int ret;
 820         struct btrfs_super_block *disk_super;
 821         struct btrfs_fs_devices *fs_devices = NULL;
 822         u64 total_devs;
 823         u64 features;
 824
 825         if (sb_bytenr == 0)
 826                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 827
 828         /* try to drop all the caches */
 829         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
 830                 fprintf(stderr, "Warning, could not drop caches\n");
 831
 832         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 833                                     &total_devs, sb_bytenr);
 834
 835         if (ret) {
 836                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 837                 goto out;
 838         }
 839
 840         if (total_devs != 1) {
 841                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 842                 if (ret)
 843                         goto out;
 844         }
 845
 846         memset(fs_info, 0, sizeof(*fs_info));
 847         fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
 848         fs_info->tree_root = tree_root;
 849         fs_info->extent_root = extent_root;
 850         fs_info->chunk_root = chunk_root;
 851         fs_info->dev_root = dev_root;
 852         fs_info->csum_root = csum_root;
 853
 854         if (!writes)
 855                 fs_info->readonly = 1;
 856
 857         extent_io_tree_init(&fs_info->extent_cache);
 858         extent_io_tree_init(&fs_info->free_space_cache);
 859         extent_io_tree_init(&fs_info->block_group_cache);
 860         extent_io_tree_init(&fs_info->pinned_extents);
 861         extent_io_tree_init(&fs_info->pending_del);
 862         extent_io_tree_init(&fs_info->extent_ins);
 863         cache_tree_init(&fs_info->fs_root_cache);
 864
 865         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 866
 867         mutex_init(&fs_info->fs_mutex);
 868         fs_info->fs_devices = fs_devices;
 869         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 870         INIT_LIST_HEAD(&fs_info->space_info);
 871
 872         __setup_root(4096, 4096, 4096, 4096, tree_root,
 873                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 874
 875         if (writes)
 876                 ret = btrfs_open_devices(fs_devices, O_RDWR);
 877         else
 878                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
 879         if (ret)
 880                 goto out_cleanup;
 881
 882         fs_info->super_bytenr = sb_bytenr;
 883         disk_super = fs_info->super_copy;
 884         ret = btrfs_read_dev_super(fs_devices->latest_bdev,
 885                                    disk_super, sb_bytenr);
 886         if (ret) {
 887                 printk("No valid btrfs found\n");
 888                 goto out_devices;
 889         }
 890
 891         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
 892
 893
 894         features = btrfs_super_incompat_flags(disk_super) &
 895                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 896         if (features) {
 897                 printk("couldn't open because of unsupported "
 898                        "option features (%Lx).\n",
 899                        (unsigned long long)features);
 900                 goto out_devices;
 901         }
 902
 903         features = btrfs_super_incompat_flags(disk_super);
 904         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 905                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 906                 btrfs_set_super_incompat_flags(disk_super, features);
 907         }
 908
 909         features = btrfs_super_compat_ro_flags(disk_super) &
 910                 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
 911         if (writes && features) {
 912                 printk("couldn't open RDWR because of unsupported "
 913                        "option features (%Lx).\n",
 914                        (unsigned long long)features);
 915                 goto out_devices;
 916         }
 917
 918         nodesize = btrfs_super_nodesize(disk_super);
 919         leafsize = btrfs_super_leafsize(disk_super);
 920         sectorsize = btrfs_super_sectorsize(disk_super);
 921         stripesize = btrfs_super_stripesize(disk_super);
 922         tree_root->nodesize = nodesize;
 923         tree_root->leafsize = leafsize;
 924         tree_root->sectorsize = sectorsize;
 925         tree_root->stripesize = stripesize;
 926
 927         ret = btrfs_read_sys_array(tree_root);
 928         if (ret)
 929                 goto out_devices;
 930         blocksize = btrfs_level_size(tree_root,
 931                                      btrfs_super_chunk_root_level(disk_super));
 932         generation = btrfs_super_chunk_root_generation(disk_super);
 933
 934         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 935                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 936
 937         chunk_root->node = read_tree_block(chunk_root,
 938                                            btrfs_super_chunk_root(disk_super),
 939                                            blocksize, generation);
 940         if (!extent_buffer_uptodate(chunk_root->node)) {
 941                 printk("Couldn't read chunk root\n");
 942                 goto out_devices;
 943         }
 944
 945         read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
 946                  (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
 947                  BTRFS_UUID_SIZE);
 948
 949         if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
 950                 ret = btrfs_read_chunk_tree(chunk_root);
 951                 if (ret) {
 952                         printk("Couldn't read chunk tree\n");
 953                         goto out_chunk;
 954                 }
 955         }
 956
 957         blocksize = btrfs_level_size(tree_root,
 958                                      btrfs_super_root_level(disk_super));
 959         generation = btrfs_super_generation(disk_super);
 960
 961         if (!root_tree_bytenr)
 962                 root_tree_bytenr = btrfs_super_root(disk_super);
 963         tree_root->node = read_tree_block(tree_root,
 964                                           root_tree_bytenr,
 965                                           blocksize, generation);
 966         if (!extent_buffer_uptodate(tree_root->node)) {
 967                 printk("Couldn't read tree root\n");
 968                 goto out_failed;
 969         }
 970         ret = find_and_setup_root(tree_root, fs_info,
 971                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 972         if (ret) {
 973                 printk("Couldn't setup extent tree\n");
 974                 goto out_failed;
 975         }
 976         extent_root->track_dirty = 1;
 977
 978         ret = find_and_setup_root(tree_root, fs_info,
 979                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 980         if (ret) {
 981                 printk("Couldn't setup device tree\n");
 982                 goto out_failed;
 983         }
 984         dev_root->track_dirty = 1;
 985
 986         ret = find_and_setup_root(tree_root, fs_info,
 987                                   BTRFS_CSUM_TREE_OBJECTID, csum_root);
 988         if (ret) {
 989                 printk("Couldn't setup csum tree\n");
 990                 if (!partial)
 991                         goto out_failed;
 992         }
 993         csum_root->track_dirty = 1;
 994
 995         find_and_setup_log_root(tree_root, fs_info, disk_super);
 996
 997         fs_info->generation = generation;
 998         fs_info->last_trans_committed = generation;
 999         btrfs_read_block_groups(fs_info->tree_root);
1000
1001         key.objectid = BTRFS_FS_TREE_OBJECTID;
1002         key.type = BTRFS_ROOT_ITEM_KEY;
1003         key.offset = (u64)-1;
1004         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1005
1006         if (!fs_info->fs_root)
1007                 goto out_failed;
1008
1009         fs_info->data_alloc_profile = (u64)-1;
1010         fs_info->metadata_alloc_profile = (u64)-1;
1011         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1012
1013         return fs_info;
1014
1015 out_failed:
1016         if (partial)
1017                 return fs_info;
1018
1019         if (fs_info->csum_root)
1020                 free_extent_buffer(fs_info->csum_root->node);
1021         if (fs_info->dev_root)
1022                 free_extent_buffer(fs_info->dev_root->node);
1023         if (fs_info->extent_root)
1024                 free_extent_buffer(fs_info->extent_root->node);
1025         if (fs_info->tree_root)
1026                 free_extent_buffer(fs_info->tree_root->node);
1027 out_chunk:
1028         if (fs_info->chunk_root)
1029                 free_extent_buffer(fs_info->chunk_root->node);
1030 out_devices:
1031         close_all_devices(fs_info);
1032 out_cleanup:
1033         extent_io_tree_cleanup(&fs_info->extent_cache);
1034         extent_io_tree_cleanup(&fs_info->free_space_cache);
1035         extent_io_tree_cleanup(&fs_info->block_group_cache);
1036         extent_io_tree_cleanup(&fs_info->pinned_extents);
1037         extent_io_tree_cleanup(&fs_info->pending_del);
1038         extent_io_tree_cleanup(&fs_info->extent_ins);
1039 out:
1040         free(tree_root);
1041         free(extent_root);
1042         free(chunk_root);
1043         free(dev_root);
1044         free(csum_root);
1045         free(fs_info);
1046         return NULL;
1047 }
1048
1049 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1050                                          u64 sb_bytenr, u64 root_tree_bytenr,
1051                                          int writes, int partial)
1052 {
1053         int fp;
1054         struct btrfs_fs_info *info;
1055         int flags = O_CREAT | O_RDWR;
1056
1057         if (!writes)
1058                 flags = O_RDONLY;
1059
1060         fp = open(filename, flags, 0600);
1061         if (fp < 0) {
1062                 fprintf (stderr, "Could not open %s\n", filename);
1063                 return NULL;
1064         }
1065         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1066                                writes, partial);
1067         close(fp);
1068         return info;
1069 }
1070
1071 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
1072 {
1073         struct btrfs_fs_info *info;
1074
1075         info = open_ctree_fs_info(filename, sb_bytenr, 0, writes, 0);
1076         if (!info)
1077                 return NULL;
1078         return info->fs_root;
1079 }
1080
1081 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1082                                  int writes)
1083 {
1084         struct btrfs_fs_info *info;
1085         info = __open_ctree_fd(fp, path, sb_bytenr, 0, writes, 0);
1086         if (!info)
1087                 return NULL;
1088         return info->fs_root;
1089 }
1090
1091 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
1092 {
1093         u8 fsid[BTRFS_FSID_SIZE];
1094         int fsid_is_initialized = 0;
1095         struct btrfs_super_block buf;
1096         int i;
1097         int ret;
1098         u64 transid = 0;
1099         u64 bytenr;
1100
1101         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1102                 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
1103                 if (ret < sizeof(buf))
1104                         return -1;
1105
1106                 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
1107                     buf.magic != cpu_to_le64(BTRFS_MAGIC))
1108                         return -1;
1109
1110                 memcpy(sb, &buf, sizeof(*sb));
1111                 return 0;
1112         }
1113
1114         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1115                 bytenr = btrfs_sb_offset(i);
1116                 ret = pread64(fd, &buf, sizeof(buf), bytenr);
1117                 if (ret < sizeof(buf))
1118                         break;
1119
1120                 if (btrfs_super_bytenr(&buf) != bytenr )
1121                         continue;
1122                 /* if magic is NULL, the device was removed */
1123                 if (buf.magic == 0 && i == 0)
1124                         return -1;
1125                 if (buf.magic != cpu_to_le64(BTRFS_MAGIC))
1126                         continue;
1127
1128                 if (!fsid_is_initialized) {
1129                         memcpy(fsid, buf.fsid, sizeof(fsid));
1130                         fsid_is_initialized = 1;
1131                 } else if (memcmp(fsid, buf.fsid, sizeof(fsid))) {
1132                         /*
1133                          * the superblocks (the original one and
1134                          * its backups) contain data of different
1135                          * filesystems -> the super cannot be trusted
1136                          */
1137                         continue;
1138                 }
1139
1140                 if (btrfs_super_generation(&buf) > transid) {
1141                         memcpy(sb, &buf, sizeof(*sb));
1142                         transid = btrfs_super_generation(&buf);
1143                 }
1144         }
1145
1146         return transid > 0 ? 0 : -1;
1147 }
1148
1149 int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
1150                      struct btrfs_device *device)
1151 {
1152         u64 bytenr;
1153         u32 crc;
1154         int i, ret;
1155
1156         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1157                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1158                 crc = ~(u32)0;
1159                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1160                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1161                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1162
1163                 /*
1164                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1165                  * zero filled, we can use it directly
1166                  */
1167                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1168                                 BTRFS_SUPER_INFO_SIZE,
1169                                 root->fs_info->super_bytenr);
1170                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1171                 return 0;
1172         }
1173
1174         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1175                 bytenr = btrfs_sb_offset(i);
1176                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1177                         break;
1178
1179                 btrfs_set_super_bytenr(sb, bytenr);
1180
1181                 crc = ~(u32)0;
1182                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1183                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1184                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1185
1186                 /*
1187                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1188                  * zero filled, we can use it directly
1189                  */
1190                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1191                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1192                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1193         }
1194
1195         return 0;
1196 }
1197
1198 int write_all_supers(struct btrfs_root *root)
1199 {
1200         struct list_head *cur;
1201         struct list_head *head = &root->fs_info->fs_devices->devices;
1202         struct btrfs_device *dev;
1203         struct btrfs_super_block *sb;
1204         struct btrfs_dev_item *dev_item;
1205         int ret;
1206         u64 flags;
1207
1208         sb = root->fs_info->super_copy;
1209         dev_item = &sb->dev_item;
1210         list_for_each(cur, head) {
1211                 dev = list_entry(cur, struct btrfs_device, dev_list);
1212                 if (!dev->writeable)
1213                         continue;
1214
1215                 btrfs_set_stack_device_generation(dev_item, 0);
1216                 btrfs_set_stack_device_type(dev_item, dev->type);
1217                 btrfs_set_stack_device_id(dev_item, dev->devid);
1218                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1219                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1220                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1221                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1222                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1223                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1224                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1225
1226                 flags = btrfs_super_flags(sb);
1227                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1228
1229                 ret = write_dev_supers(root, sb, dev);
1230                 BUG_ON(ret);
1231         }
1232         return 0;
1233 }
1234
1235 int write_ctree_super(struct btrfs_trans_handle *trans,
1236                       struct btrfs_root *root)
1237 {
1238         int ret;
1239         struct btrfs_root *tree_root = root->fs_info->tree_root;
1240         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1241
1242         if (root->fs_info->readonly)
1243                 return 0;
1244
1245         btrfs_set_super_generation(root->fs_info->super_copy,
1246                                    trans->transid);
1247         btrfs_set_super_root(root->fs_info->super_copy,
1248                              tree_root->node->start);
1249         btrfs_set_super_root_level(root->fs_info->super_copy,
1250                                    btrfs_header_level(tree_root->node));
1251         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1252                                    chunk_root->node->start);
1253         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1254                                          btrfs_header_level(chunk_root->node));
1255         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1256                                 btrfs_header_generation(chunk_root->node));
1257
1258         ret = write_all_supers(root);
1259         if (ret)
1260                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1261         return ret;
1262 }
1263
1264 static int close_all_devices(struct btrfs_fs_info *fs_info)
1265 {
1266         struct list_head *list;
1267         struct btrfs_device *device;
1268
1269         list = &fs_info->fs_devices->devices;
1270         while (!list_empty(list)) {
1271                 device = list_entry(list->next, struct btrfs_device, dev_list);
1272                 list_del_init(&device->dev_list);
1273                 if (device->fd) {
1274                         fsync(device->fd);
1275                         if (posix_fadvise(device->fd, 0, 0, POSIX_FADV_DONTNEED))
1276                                 fprintf(stderr, "Warning, could not drop caches\n");
1277                 }
1278                 close(device->fd);
1279                 kfree(device->name);
1280                 kfree(device->label);
1281                 kfree(device);
1282         }
1283         kfree(fs_info->fs_devices);
1284         return 0;
1285 }
1286
1287 static void free_mapping_cache(struct btrfs_fs_info *fs_info)
1288 {
1289         struct cache_tree *cache_tree = &fs_info->mapping_tree.cache_tree;
1290         struct cache_extent *ce;
1291         struct map_lookup *map;
1292
1293         while ((ce = find_first_cache_extent(cache_tree, 0))) {
1294                 map = container_of(ce, struct map_lookup, ce);
1295                 remove_cache_extent(cache_tree, ce);
1296                 kfree(map);
1297         }
1298 }
1299
1300 int close_ctree(struct btrfs_root *root)
1301 {
1302         int ret;
1303         struct btrfs_trans_handle *trans;
1304         struct btrfs_fs_info *fs_info = root->fs_info;
1305
1306         if (fs_info->last_trans_committed !=
1307             fs_info->generation) {
1308                 trans = btrfs_start_transaction(root, 1);
1309                 btrfs_commit_transaction(trans, root);
1310                 trans = btrfs_start_transaction(root, 1);
1311                 ret = commit_tree_roots(trans, fs_info);
1312                 BUG_ON(ret);
1313                 ret = __commit_transaction(trans, root);
1314                 BUG_ON(ret);
1315                 write_ctree_super(trans, root);
1316                 btrfs_free_transaction(root, trans);
1317         }
1318         btrfs_free_block_groups(fs_info);
1319
1320         free_fs_roots(fs_info);
1321
1322         if (fs_info->extent_root->node)
1323                 free_extent_buffer(fs_info->extent_root->node);
1324         if (fs_info->tree_root->node)
1325                 free_extent_buffer(fs_info->tree_root->node);
1326         if (fs_info->chunk_root->node)
1327                 free_extent_buffer(fs_info->chunk_root->node);
1328         if (fs_info->dev_root->node)
1329                 free_extent_buffer(fs_info->dev_root->node);
1330         if (fs_info->csum_root->node)
1331                 free_extent_buffer(fs_info->csum_root->node);
1332
1333         if (fs_info->log_root_tree) {
1334                 if (fs_info->log_root_tree->node)
1335                         free_extent_buffer(fs_info->log_root_tree->node);
1336                 free(fs_info->log_root_tree);
1337         }
1338
1339         close_all_devices(fs_info);
1340         free_mapping_cache(fs_info);
1341         extent_io_tree_cleanup(&fs_info->extent_cache);
1342         extent_io_tree_cleanup(&fs_info->free_space_cache);
1343         extent_io_tree_cleanup(&fs_info->block_group_cache);
1344         extent_io_tree_cleanup(&fs_info->pinned_extents);
1345         extent_io_tree_cleanup(&fs_info->pending_del);
1346         extent_io_tree_cleanup(&fs_info->extent_ins);
1347
1348         free(fs_info->tree_root);
1349         free(fs_info->extent_root);
1350         free(fs_info->chunk_root);
1351         free(fs_info->dev_root);
1352         free(fs_info->csum_root);
1353         free(fs_info);
1354
1355         return 0;
1356 }
1357
1358 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1359                      struct extent_buffer *eb)
1360 {
1361         return clear_extent_buffer_dirty(eb);
1362 }
1363
1364 int wait_on_tree_block_writeback(struct btrfs_root *root,
1365                                  struct extent_buffer *eb)
1366 {
1367         return 0;
1368 }
1369
1370 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1371 {
1372         set_extent_buffer_dirty(eb);
1373 }
1374
1375 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1376 {
1377         int ret;
1378
1379         ret = extent_buffer_uptodate(buf);
1380         if (!ret)
1381                 return ret;
1382
1383         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1384         return !ret;
1385 }
1386
1387 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1388 {
1389         return set_extent_buffer_uptodate(eb);
1390 }