disk-io.c

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #define _XOPEN_SOURCE 600
  20 #define __USE_XOPEN2K
  21 #define _GNU_SOURCE 1
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include "kerncompat.h"
  29 #include "radix-tree.h"
  30 #include "ctree.h"
  31 #include "disk-io.h"
  32 #include "volumes.h"
  33 #include "transaction.h"
  34 #include "crc32c.h"
  35 #include "utils.h"
  36 #include "print-tree.h"
  37
  38 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
  39 {
  40
  41         struct btrfs_fs_devices *fs_devices;
  42         int ret = 1;
  43
  44         if (buf->start != btrfs_header_bytenr(buf)) {
  45                 printk("Check tree block failed, want=%Lu, have=%Lu\n",
  46                        buf->start, btrfs_header_bytenr(buf));
  47                 return ret;
  48         }
  49
  50         fs_devices = root->fs_info->fs_devices;
  51         while (fs_devices) {
  52                 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
  53                                           (unsigned long)btrfs_header_fsid(buf),
  54                                           BTRFS_FSID_SIZE)) {
  55                         ret = 0;
  56                         break;
  57                 }
  58                 fs_devices = fs_devices->seed;
  59         }
  60         return ret;
  61 }
  62
  63 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  64 {
  65         return crc32c(seed, data, len);
  66 }
  67
  68 void btrfs_csum_final(u32 crc, char *result)
  69 {
  70         *(__le32 *)result = ~cpu_to_le32(crc);
  71 }
  72
  73 static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
  74                                   int verify, int silent)
  75 {
  76         char *result;
  77         u32 len;
  78         u32 crc = ~(u32)0;
  79
  80         result = malloc(csum_size * sizeof(char));
  81         if (!result)
  82                 return 1;
  83
  84         len = buf->len - BTRFS_CSUM_SIZE;
  85         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  86         btrfs_csum_final(crc, result);
  87
  88         if (verify) {
  89                 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
  90                         if (!silent)
  91                                 printk("checksum verify failed on %llu found %08X wanted %08X\n",
  92                                        (unsigned long long)buf->start,
  93                                        *((u32 *)result),
  94                                        *((u32*)(char *)buf->data));
  95                         free(result);
  96                         return 1;
  97                 }
  98         } else {
  99                 write_extent_buffer(buf, result, 0, csum_size);
 100         }
 101         free(result);
 102         return 0;
 103 }
 104
 105 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
 106 {
 107         return __csum_tree_block_size(buf, csum_size, verify, 0);
 108 }
 109
 110 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
 111 {
 112         return __csum_tree_block_size(buf, csum_size, 1, 1);
 113 }
 114
 115 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 116                     int verify)
 117 {
 118         u16 csum_size =
 119                 btrfs_super_csum_size(root->fs_info->super_copy);
 120         return csum_tree_block_size(buf, csum_size, verify);
 121 }
 122
 123 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 124                                             u64 bytenr, u32 blocksize)
 125 {
 126         return find_extent_buffer(&root->fs_info->extent_cache,
 127                                   bytenr, blocksize);
 128 }
 129
 130 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 131                                                  u64 bytenr, u32 blocksize)
 132 {
 133         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
 134                                    blocksize);
 135 }
 136
 137 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
 138                          u64 parent_transid)
 139 {
 140         int ret;
 141         struct extent_buffer *eb;
 142         u64 length;
 143         struct btrfs_multi_bio *multi = NULL;
 144         struct btrfs_device *device;
 145
 146         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 147         if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
 148                 free_extent_buffer(eb);
 149                 return 0;
 150         }
 151
 152         length = blocksize;
 153         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 154                               bytenr, &length, &multi, 0, NULL);
 155         BUG_ON(ret);
 156         device = multi->stripes[0].dev;
 157         device->total_ios++;
 158         blocksize = min(blocksize, (u32)(64 * 1024));
 159         readahead(device->fd, multi->stripes[0].physical, blocksize);
 160         kfree(multi);
 161         return 0;
 162 }
 163
 164 static int verify_parent_transid(struct extent_io_tree *io_tree,
 165                                  struct extent_buffer *eb, u64 parent_transid,
 166                                  int ignore)
 167 {
 168         int ret;
 169
 170         if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
 171                 return 0;
 172
 173         if (extent_buffer_uptodate(eb) &&
 174             btrfs_header_generation(eb) == parent_transid) {
 175                 ret = 0;
 176                 goto out;
 177         }
 178         printk("parent transid verify failed on %llu wanted %llu found %llu\n",
 179                (unsigned long long)eb->start,
 180                (unsigned long long)parent_transid,
 181                (unsigned long long)btrfs_header_generation(eb));
 182         if (ignore) {
 183                 printk("Ignoring transid failure\n");
 184                 return 0;
 185         }
 186
 187         ret = 1;
 188 out:
 189         clear_extent_buffer_uptodate(io_tree, eb);
 190         return ret;
 191
 192 }
 193
 194
 195 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
 196 {
 197         unsigned long offset = 0;
 198         struct btrfs_multi_bio *multi = NULL;
 199         struct btrfs_device *device;
 200         int ret = 0;
 201         u64 read_len;
 202         unsigned long bytes_left = eb->len;
 203
 204         while (bytes_left) {
 205                 read_len = bytes_left;
 206                 device = NULL;
 207
 208                 if (!info->on_restoring) {
 209                         ret = btrfs_map_block(&info->mapping_tree, READ,
 210                                               eb->start + offset, &read_len, &multi,
 211                                               mirror, NULL);
 212                         if (ret) {
 213                                 printk("Couldn't map the block %Lu\n", eb->start + offset);
 214                                 kfree(multi);
 215                                 return -EIO;
 216                         }
 217                         device = multi->stripes[0].dev;
 218
 219                         if (device->fd == 0) {
 220                                 kfree(multi);
 221                                 return -EIO;
 222                         }
 223
 224                         eb->fd = device->fd;
 225                         device->total_ios++;
 226                         eb->dev_bytenr = multi->stripes[0].physical;
 227                         kfree(multi);
 228                         multi = NULL;
 229                 } else {
 230                         /* special case for restore metadump */
 231                         list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
 232                                 if (device->devid == 1)
 233                                         break;
 234                         }
 235
 236                         eb->fd = device->fd;
 237                         eb->dev_bytenr = eb->start;
 238                         device->total_ios++;
 239                 }
 240
 241                 if (read_len > bytes_left)
 242                         read_len = bytes_left;
 243
 244                 ret = read_extent_from_disk(eb, offset, read_len);
 245                 if (ret)
 246                         return -EIO;
 247                 offset += read_len;
 248                 bytes_left -= read_len;
 249         }
 250         return 0;
 251 }
 252
 253 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 254                                      u32 blocksize, u64 parent_transid)
 255 {
 256         int ret;
 257         struct extent_buffer *eb;
 258         u64 best_transid = 0;
 259         int mirror_num = 0;
 260         int good_mirror = 0;
 261         int num_copies;
 262         int ignore = 0;
 263
 264         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 265         if (!eb)
 266                 return NULL;
 267
 268         if (btrfs_buffer_uptodate(eb, parent_transid))
 269                 return eb;
 270
 271         while (1) {
 272                 ret = read_whole_eb(root->fs_info, eb, mirror_num);
 273                 if (ret == 0 && check_tree_block(root, eb) == 0 &&
 274                     csum_tree_block(root, eb, 1) == 0 &&
 275                     verify_parent_transid(eb->tree, eb, parent_transid, ignore)
 276                     == 0) {
 277                         btrfs_set_buffer_uptodate(eb);
 278                         return eb;
 279                 }
 280                 if (ignore) {
 281                         if (check_tree_block(root, eb))
 282                                 printk("read block failed check_tree_block\n");
 283                         else
 284                                 printk("Csum didn't match\n");
 285                         break;
 286                 }
 287                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 288                                               eb->start, eb->len);
 289                 if (num_copies == 1) {
 290                         ignore = 1;
 291                         continue;
 292                 }
 293                 if (btrfs_header_generation(eb) > best_transid) {
 294                         best_transid = btrfs_header_generation(eb);
 295                         good_mirror = mirror_num;
 296                 }
 297                 mirror_num++;
 298                 if (mirror_num > num_copies) {
 299                         mirror_num = good_mirror;
 300                         ignore = 1;
 301                         continue;
 302                 }
 303         }
 304         free_extent_buffer(eb);
 305         return NULL;
 306 }
 307
 308 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 309                      struct extent_buffer *eb)
 310 {
 311         int ret;
 312         int dev_nr;
 313         u64 length;
 314         u64 *raid_map = NULL;
 315         struct btrfs_multi_bio *multi = NULL;
 316
 317         if (check_tree_block(root, eb))
 318                 BUG();
 319
 320         if (!btrfs_buffer_uptodate(eb, trans->transid))
 321                 BUG();
 322
 323         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 324         csum_tree_block(root, eb, 0);
 325
 326         dev_nr = 0;
 327         length = eb->len;
 328         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 329                               eb->start, &length, &multi, 0, &raid_map);
 330
 331         if (raid_map) {
 332                 ret = write_raid56_with_parity(root->fs_info, eb, multi,
 333                                                length, raid_map);
 334                 BUG_ON(ret);
 335         } else while (dev_nr < multi->num_stripes) {
 336                 BUG_ON(ret);
 337                 eb->fd = multi->stripes[dev_nr].dev->fd;
 338                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 339                 multi->stripes[dev_nr].dev->total_ios++;
 340                 dev_nr++;
 341                 ret = write_extent_to_disk(eb);
 342                 BUG_ON(ret);
 343         }
 344         kfree(multi);
 345         return 0;
 346 }
 347
 348 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 349                         u32 stripesize, struct btrfs_root *root,
 350                         struct btrfs_fs_info *fs_info, u64 objectid)
 351 {
 352         root->node = NULL;
 353         root->commit_root = NULL;
 354         root->sectorsize = sectorsize;
 355         root->nodesize = nodesize;
 356         root->leafsize = leafsize;
 357         root->stripesize = stripesize;
 358         root->ref_cows = 0;
 359         root->track_dirty = 0;
 360
 361         root->fs_info = fs_info;
 362         root->objectid = objectid;
 363         root->last_trans = 0;
 364         root->highest_inode = 0;
 365         root->last_inode_alloc = 0;
 366
 367         INIT_LIST_HEAD(&root->dirty_list);
 368         memset(&root->root_key, 0, sizeof(root->root_key));
 369         memset(&root->root_item, 0, sizeof(root->root_item));
 370         root->root_key.objectid = objectid;
 371         return 0;
 372 }
 373
 374 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 375                                struct btrfs_root *root)
 376 {
 377         int ret;
 378         u64 old_root_bytenr;
 379         struct btrfs_root *tree_root = root->fs_info->tree_root;
 380
 381         btrfs_write_dirty_block_groups(trans, root);
 382         while(1) {
 383                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 384                 if (old_root_bytenr == root->node->start)
 385                         break;
 386                 btrfs_set_root_bytenr(&root->root_item,
 387                                        root->node->start);
 388                 btrfs_set_root_generation(&root->root_item,
 389                                           trans->transid);
 390                 root->root_item.level = btrfs_header_level(root->node);
 391                 ret = btrfs_update_root(trans, tree_root,
 392                                         &root->root_key,
 393                                         &root->root_item);
 394                 BUG_ON(ret);
 395                 btrfs_write_dirty_block_groups(trans, root);
 396         }
 397         return 0;
 398 }
 399
 400 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 401                              struct btrfs_fs_info *fs_info)
 402 {
 403         struct btrfs_root *root;
 404         struct list_head *next;
 405         struct extent_buffer *eb;
 406         int ret;
 407
 408         if (fs_info->readonly)
 409                 return 0;
 410
 411         eb = fs_info->tree_root->node;
 412         extent_buffer_get(eb);
 413         ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 414         free_extent_buffer(eb);
 415         if (ret)
 416                 return ret;
 417
 418         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 419                 next = fs_info->dirty_cowonly_roots.next;
 420                 list_del_init(next);
 421                 root = list_entry(next, struct btrfs_root, dirty_list);
 422                 update_cowonly_root(trans, root);
 423                 free_extent_buffer(root->commit_root);
 424                 root->commit_root = NULL;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int __commit_transaction(struct btrfs_trans_handle *trans,
 431                                 struct btrfs_root *root)
 432 {
 433         u64 start;
 434         u64 end;
 435         struct extent_buffer *eb;
 436         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 437         int ret;
 438
 439         while(1) {
 440                 ret = find_first_extent_bit(tree, 0, &start, &end,
 441                                             EXTENT_DIRTY);
 442                 if (ret)
 443                         break;
 444                 while(start <= end) {
 445                         eb = find_first_extent_buffer(tree, start);
 446                         BUG_ON(!eb || eb->start != start);
 447                         ret = write_tree_block(trans, root, eb);
 448                         BUG_ON(ret);
 449                         start += eb->len;
 450                         clear_extent_buffer_dirty(eb);
 451                         free_extent_buffer(eb);
 452                 }
 453         }
 454         return 0;
 455 }
 456
 457 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 458                              struct btrfs_root *root)
 459 {
 460         u64 transid = trans->transid;
 461         int ret = 0;
 462         struct btrfs_fs_info *fs_info = root->fs_info;
 463
 464         if (root->commit_root == root->node)
 465                 goto commit_tree;
 466
 467         free_extent_buffer(root->commit_root);
 468         root->commit_root = NULL;
 469
 470         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 471         btrfs_set_root_generation(&root->root_item, trans->transid);
 472         root->root_item.level = btrfs_header_level(root->node);
 473         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 474                                 &root->root_key, &root->root_item);
 475         BUG_ON(ret);
 476 commit_tree:
 477         ret = commit_tree_roots(trans, fs_info);
 478         BUG_ON(ret);
 479         ret = __commit_transaction(trans, root);
 480         BUG_ON(ret);
 481         write_ctree_super(trans, root);
 482         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 483                                    &fs_info->pinned_extents);
 484         btrfs_free_transaction(root, trans);
 485         free_extent_buffer(root->commit_root);
 486         root->commit_root = NULL;
 487         fs_info->running_transaction = NULL;
 488         fs_info->last_trans_committed = transid;
 489         return 0;
 490 }
 491
 492 static int find_and_setup_root(struct btrfs_root *tree_root,
 493                                struct btrfs_fs_info *fs_info,
 494                                u64 objectid, struct btrfs_root *root)
 495 {
 496         int ret;
 497         u32 blocksize;
 498         u64 generation;
 499
 500         __setup_root(tree_root->nodesize, tree_root->leafsize,
 501                      tree_root->sectorsize, tree_root->stripesize,
 502                      root, fs_info, objectid);
 503         ret = btrfs_find_last_root(tree_root, objectid,
 504                                    &root->root_item, &root->root_key);
 505         if (ret)
 506                 return ret;
 507
 508         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 509         generation = btrfs_root_generation(&root->root_item);
 510         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 511                                      blocksize, generation);
 512         if (!extent_buffer_uptodate(root->node))
 513                 return -EIO;
 514
 515         return 0;
 516 }
 517
 518 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 519                                struct btrfs_fs_info *fs_info,
 520                                struct btrfs_super_block *disk_super)
 521 {
 522         u32 blocksize;
 523         u64 blocknr = btrfs_super_log_root(disk_super);
 524         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 525
 526         if (!log_root)
 527                 return -ENOMEM;
 528
 529         if (blocknr == 0) {
 530                 free(log_root);
 531                 return 0;
 532         }
 533
 534         blocksize = btrfs_level_size(tree_root,
 535                              btrfs_super_log_root_level(disk_super));
 536
 537         __setup_root(tree_root->nodesize, tree_root->leafsize,
 538                      tree_root->sectorsize, tree_root->stripesize,
 539                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 540
 541         log_root->node = read_tree_block(tree_root, blocknr,
 542                                      blocksize,
 543                                      btrfs_super_generation(disk_super) + 1);
 544
 545         fs_info->log_root_tree = log_root;
 546
 547         if (!extent_buffer_uptodate(log_root->node)) {
 548                 free_extent_buffer(log_root->node);
 549                 free(log_root);
 550                 fs_info->log_root_tree = NULL;
 551                 return -EIO;
 552         }
 553
 554         return 0;
 555 }
 556
 557
 558 int btrfs_free_fs_root(struct btrfs_root *root)
 559 {
 560         if (root->node)
 561                 free_extent_buffer(root->node);
 562         if (root->commit_root)
 563                 free_extent_buffer(root->commit_root);
 564         kfree(root);
 565         return 0;
 566 }
 567
 568 static void __free_fs_root(struct rb_node *node)
 569 {
 570         struct btrfs_root *root;
 571
 572         root = container_of(node, struct btrfs_root, rb_node);
 573         btrfs_free_fs_root(root);
 574 }
 575
 576 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
 577
 578 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 579                                                struct btrfs_key *location)
 580 {
 581         struct btrfs_root *root;
 582         struct btrfs_root *tree_root = fs_info->tree_root;
 583         struct btrfs_path *path;
 584         struct extent_buffer *l;
 585         u64 generation;
 586         u32 blocksize;
 587         int ret = 0;
 588
 589         root = malloc(sizeof(*root));
 590         if (!root)
 591                 return ERR_PTR(-ENOMEM);
 592         memset(root, 0, sizeof(*root));
 593         if (location->offset == (u64)-1) {
 594                 ret = find_and_setup_root(tree_root, fs_info,
 595                                           location->objectid, root);
 596                 if (ret) {
 597                         free(root);
 598                         return ERR_PTR(ret);
 599                 }
 600                 goto insert;
 601         }
 602
 603         __setup_root(tree_root->nodesize, tree_root->leafsize,
 604                      tree_root->sectorsize, tree_root->stripesize,
 605                      root, fs_info, location->objectid);
 606
 607         path = btrfs_alloc_path();
 608         BUG_ON(!path);
 609         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 610         if (ret != 0) {
 611                 if (ret > 0)
 612                         ret = -ENOENT;
 613                 goto out;
 614         }
 615         l = path->nodes[0];
 616         read_extent_buffer(l, &root->root_item,
 617                btrfs_item_ptr_offset(l, path->slots[0]),
 618                sizeof(root->root_item));
 619         memcpy(&root->root_key, location, sizeof(*location));
 620         ret = 0;
 621 out:
 622         btrfs_release_path(root, path);
 623         btrfs_free_path(path);
 624         if (ret) {
 625                 free(root);
 626                 return ERR_PTR(ret);
 627         }
 628         generation = btrfs_root_generation(&root->root_item);
 629         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 630         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 631                                      blocksize, generation);
 632         BUG_ON(!root->node);
 633 insert:
 634         root->ref_cows = 1;
 635         return root;
 636 }
 637
 638 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
 639                                             void *data)
 640 {
 641         u64 objectid = *((u64 *)data);
 642         struct btrfs_root *root;
 643
 644         root = rb_entry(node, struct btrfs_root, rb_node);
 645         if (objectid > root->objectid)
 646                 return 1;
 647         else if (objectid < root->objectid)
 648                 return -1;
 649         else
 650                 return 0;
 651 }
 652
 653 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
 654                                         struct rb_node *node2)
 655 {
 656         struct btrfs_root *root;
 657
 658         root = rb_entry(node2, struct btrfs_root, rb_node);
 659         return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
 660 }
 661
 662 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 663                                       struct btrfs_key *location)
 664 {
 665         struct btrfs_root *root;
 666         struct rb_node *node;
 667         int ret;
 668
 669         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 670                 return fs_info->tree_root;
 671         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 672                 return fs_info->extent_root;
 673         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 674                 return fs_info->chunk_root;
 675         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 676                 return fs_info->dev_root;
 677         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 678                 return fs_info->csum_root;
 679
 680         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 681                location->offset != (u64)-1);
 682
 683         node = rb_search(&fs_info->fs_root_tree, (void *)&location->objectid,
 684                          btrfs_fs_roots_compare_objectids, NULL);
 685         if (node)
 686                 return container_of(node, struct btrfs_root, rb_node);
 687
 688         root = btrfs_read_fs_root_no_cache(fs_info, location);
 689         if (IS_ERR(root))
 690                 return root;
 691
 692         ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
 693                         btrfs_fs_roots_compare_roots);
 694         BUG_ON(ret);
 695         return root;
 696 }
 697
 698 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 699 {
 700         free(fs_info->tree_root);
 701         free(fs_info->extent_root);
 702         free(fs_info->chunk_root);
 703         free(fs_info->dev_root);
 704         free(fs_info->csum_root);
 705         free(fs_info->super_copy);
 706         free(fs_info->log_root_tree);
 707         free(fs_info);
 708 }
 709
 710 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
 711 {
 712         struct btrfs_fs_info *fs_info;
 713
 714         fs_info = malloc(sizeof(struct btrfs_fs_info));
 715         if (!fs_info)
 716                 return NULL;
 717
 718         memset(fs_info, 0, sizeof(struct btrfs_fs_info));
 719
 720         fs_info->tree_root = malloc(sizeof(struct btrfs_root));
 721         fs_info->extent_root = malloc(sizeof(struct btrfs_root));
 722         fs_info->chunk_root = malloc(sizeof(struct btrfs_root));
 723         fs_info->dev_root = malloc(sizeof(struct btrfs_root));
 724         fs_info->csum_root = malloc(sizeof(struct btrfs_root));
 725         fs_info->super_copy = malloc(BTRFS_SUPER_INFO_SIZE);
 726
 727         if (!fs_info->tree_root || !fs_info->extent_root ||
 728             !fs_info->chunk_root || !fs_info->dev_root ||
 729             !fs_info->csum_root || !fs_info->super_copy)
 730                 goto free_all;
 731
 732         memset(fs_info->super_copy, 0, BTRFS_SUPER_INFO_SIZE);
 733         memset(fs_info->tree_root, 0, sizeof(struct btrfs_root));
 734         memset(fs_info->extent_root, 0, sizeof(struct btrfs_root));
 735         memset(fs_info->chunk_root, 0, sizeof(struct btrfs_root));
 736         memset(fs_info->dev_root, 0, sizeof(struct btrfs_root));
 737         memset(fs_info->csum_root, 0, sizeof(struct btrfs_root));
 738
 739         extent_io_tree_init(&fs_info->extent_cache);
 740         extent_io_tree_init(&fs_info->free_space_cache);
 741         extent_io_tree_init(&fs_info->block_group_cache);
 742         extent_io_tree_init(&fs_info->pinned_extents);
 743         extent_io_tree_init(&fs_info->pending_del);
 744         extent_io_tree_init(&fs_info->extent_ins);
 745         fs_info->fs_root_tree = RB_ROOT;
 746         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 747
 748         mutex_init(&fs_info->fs_mutex);
 749         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 750         INIT_LIST_HEAD(&fs_info->space_info);
 751
 752         if (!writable)
 753                 fs_info->readonly = 1;
 754
 755         fs_info->super_bytenr = sb_bytenr;
 756         fs_info->data_alloc_profile = (u64)-1;
 757         fs_info->metadata_alloc_profile = (u64)-1;
 758         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 759         return fs_info;
 760 free_all:
 761         btrfs_free_fs_info(fs_info);
 762         return NULL;
 763 }
 764
 765 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
 766 {
 767         u64 features;
 768
 769         features = btrfs_super_incompat_flags(sb) &
 770                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 771         if (features) {
 772                 printk("couldn't open because of unsupported "
 773                        "option features (%Lx).\n",
 774                        (unsigned long long)features);
 775                 return -ENOTSUP;
 776         }
 777
 778         features = btrfs_super_incompat_flags(sb);
 779         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 780                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 781                 btrfs_set_super_incompat_flags(sb, features);
 782         }
 783
 784         features = btrfs_super_compat_ro_flags(sb) &
 785                 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
 786         if (writable && features) {
 787                 printk("couldn't open RDWR because of unsupported "
 788                        "option features (%Lx).\n",
 789                        (unsigned long long)features);
 790                 return -ENOTSUP;
 791         }
 792         return 0;
 793 }
 794
 795 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info,
 796                           u64 root_tree_bytenr, int partial)
 797 {
 798         struct btrfs_super_block *sb = fs_info->super_copy;
 799         struct btrfs_root *root;
 800         struct btrfs_key key;
 801         u32 sectorsize;
 802         u32 nodesize;
 803         u32 leafsize;
 804         u32 stripesize;
 805         u64 generation;
 806         u32 blocksize;
 807         int ret;
 808
 809         nodesize = btrfs_super_nodesize(sb);
 810         leafsize = btrfs_super_leafsize(sb);
 811         sectorsize = btrfs_super_sectorsize(sb);
 812         stripesize = btrfs_super_stripesize(sb);
 813
 814         root = fs_info->tree_root;
 815         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 816                      root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
 817         blocksize = btrfs_level_size(root, btrfs_super_root_level(sb));
 818         generation = btrfs_super_generation(sb);
 819
 820         if (!root_tree_bytenr)
 821                 root_tree_bytenr = btrfs_super_root(sb);
 822         root->node = read_tree_block(root, root_tree_bytenr, blocksize,
 823                                      generation);
 824         if (!extent_buffer_uptodate(root->node)) {
 825                 fprintf(stderr, "Couldn't read tree root\n");
 826                 return -EIO;
 827         }
 828
 829         ret = find_and_setup_root(root, fs_info, BTRFS_EXTENT_TREE_OBJECTID,
 830                                   fs_info->extent_root);
 831         if (ret) {
 832                 printk("Couldn't setup extent tree\n");
 833                 return -EIO;
 834         }
 835         fs_info->extent_root->track_dirty = 1;
 836
 837         ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
 838                                   fs_info->dev_root);
 839         if (ret) {
 840                 printk("Couldn't setup device tree\n");
 841                 return -EIO;
 842         }
 843         fs_info->dev_root->track_dirty = 1;
 844
 845         ret = find_and_setup_root(root, fs_info, BTRFS_CSUM_TREE_OBJECTID,
 846                                   fs_info->csum_root);
 847         if (ret) {
 848                 printk("Couldn't setup csum tree\n");
 849                 if (!partial)
 850                         return -EIO;
 851         }
 852         fs_info->csum_root->track_dirty = 1;
 853
 854         ret = find_and_setup_log_root(root, fs_info, sb);
 855         if (ret) {
 856                 printk("Couldn't setup log root tree\n");
 857                 return -EIO;
 858         }
 859
 860         fs_info->generation = generation;
 861         fs_info->last_trans_committed = generation;
 862         btrfs_read_block_groups(fs_info->tree_root);
 863
 864         key.objectid = BTRFS_FS_TREE_OBJECTID;
 865         key.type = BTRFS_ROOT_ITEM_KEY;
 866         key.offset = (u64)-1;
 867         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
 868
 869         if (!fs_info->fs_root)
 870                 return -EIO;
 871         return 0;
 872 }
 873
 874 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
 875 {
 876         if (fs_info->csum_root)
 877                 free_extent_buffer(fs_info->csum_root->node);
 878         if (fs_info->dev_root)
 879                 free_extent_buffer(fs_info->dev_root->node);
 880         if (fs_info->extent_root)
 881                 free_extent_buffer(fs_info->extent_root->node);
 882         if (fs_info->tree_root)
 883                 free_extent_buffer(fs_info->tree_root->node);
 884         if (fs_info->log_root_tree)
 885                 free_extent_buffer(fs_info->log_root_tree->node);
 886         if (fs_info->chunk_root)
 887                 free_extent_buffer(fs_info->chunk_root->node);
 888 }
 889
 890 static void free_map_lookup(struct cache_extent *ce)
 891 {
 892         struct map_lookup *map;
 893
 894         map = container_of(ce, struct map_lookup, ce);
 895         kfree(map);
 896 }
 897
 898 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
 899
 900 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
 901 {
 902         free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
 903         extent_io_tree_cleanup(&fs_info->extent_cache);
 904         extent_io_tree_cleanup(&fs_info->free_space_cache);
 905         extent_io_tree_cleanup(&fs_info->block_group_cache);
 906         extent_io_tree_cleanup(&fs_info->pinned_extents);
 907         extent_io_tree_cleanup(&fs_info->pending_del);
 908         extent_io_tree_cleanup(&fs_info->extent_ins);
 909 }
 910
 911 int btrfs_scan_fs_devices(int fd, const char *path,
 912                           struct btrfs_fs_devices **fs_devices)
 913 {
 914         u64 total_devs;
 915         int ret;
 916
 917         ret = btrfs_scan_one_device(fd, path, fs_devices,
 918                                     &total_devs, BTRFS_SUPER_INFO_OFFSET);
 919         if (ret) {
 920                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 921                 return ret;
 922         }
 923
 924         if (total_devs != 1) {
 925                 ret = btrfs_scan_for_fsid(*fs_devices, total_devs, 1);
 926                 if (ret)
 927                         return ret;
 928         }
 929         return 0;
 930 }
 931
 932 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info)
 933 {
 934         struct btrfs_super_block *sb = fs_info->super_copy;
 935         u32 sectorsize;
 936         u32 nodesize;
 937         u32 leafsize;
 938         u32 blocksize;
 939         u32 stripesize;
 940         u64 generation;
 941         int ret;
 942
 943         nodesize = btrfs_super_nodesize(sb);
 944         leafsize = btrfs_super_leafsize(sb);
 945         sectorsize = btrfs_super_sectorsize(sb);
 946         stripesize = btrfs_super_stripesize(sb);
 947
 948         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 949                      fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 950
 951         ret = btrfs_read_sys_array(fs_info->chunk_root);
 952         if (ret)
 953                 return ret;
 954
 955         blocksize = btrfs_level_size(fs_info->chunk_root,
 956                                      btrfs_super_chunk_root_level(sb));
 957         generation = btrfs_super_chunk_root_generation(sb);
 958
 959         fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
 960                                                     btrfs_super_chunk_root(sb),
 961                                                     blocksize, generation);
 962         if (!fs_info->chunk_root->node ||
 963             !extent_buffer_uptodate(fs_info->chunk_root->node)) {
 964                 fprintf(stderr, "Couldn't read chunk root\n");
 965                 return ret;
 966         }
 967
 968         if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
 969                 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
 970                 if (ret) {
 971                         fprintf(stderr, "Couldn't read chunk tree\n");
 972                         return ret;
 973                 }
 974         }
 975         return 0;
 976 }
 977
 978 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
 979                                              u64 sb_bytenr,
 980                                              u64 root_tree_bytenr, int writes,
 981                                              int partial, int restore)
 982 {
 983         struct btrfs_fs_info *fs_info;
 984         struct btrfs_super_block *disk_super;
 985         struct btrfs_fs_devices *fs_devices = NULL;
 986         struct extent_buffer *eb;
 987         int ret;
 988
 989         if (sb_bytenr == 0)
 990                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 991
 992         /* try to drop all the caches */
 993         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
 994                 fprintf(stderr, "Warning, could not drop caches\n");
 995
 996         fs_info = btrfs_new_fs_info(writes, sb_bytenr);
 997         if (!fs_info) {
 998                 fprintf(stderr, "Failed to allocate memory for fs_info\n");
 999                 return NULL;
1000         }
1001         if (restore)
1002                 fs_info->on_restoring = 1;
1003
1004         ret = btrfs_scan_fs_devices(fp, path, &fs_devices);
1005         if (ret)
1006                 goto out;
1007
1008         fs_info->fs_devices = fs_devices;
1009         if (writes)
1010                 ret = btrfs_open_devices(fs_devices, O_RDWR);
1011         else
1012                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
1013         if (ret)
1014                 goto out_devices;
1015
1016
1017         disk_super = fs_info->super_copy;
1018         ret = btrfs_read_dev_super(fs_devices->latest_bdev,
1019                                    disk_super, sb_bytenr);
1020         if (ret) {
1021                 printk("No valid btrfs found\n");
1022                 goto out_devices;
1023         }
1024
1025         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1026
1027         ret = btrfs_check_fs_compatibility(fs_info->super_copy, writes);
1028         if (ret)
1029                 goto out_devices;
1030
1031         ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
1032         if (ret)
1033                 goto out_chunk;
1034
1035         eb = fs_info->chunk_root->node;
1036         read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1037                            (unsigned long)btrfs_header_chunk_tree_uuid(eb),
1038                            BTRFS_UUID_SIZE);
1039
1040         ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, partial);
1041         if (ret)
1042                 goto out_failed;
1043
1044         return fs_info;
1045
1046 out_failed:
1047         if (partial)
1048                 return fs_info;
1049 out_chunk:
1050         btrfs_release_all_roots(fs_info);
1051         btrfs_cleanup_all_caches(fs_info);
1052 out_devices:
1053         btrfs_close_devices(fs_devices);
1054 out:
1055         btrfs_free_fs_info(fs_info);
1056         return NULL;
1057 }
1058
1059 struct btrfs_fs_info *open_ctree_fs_info_restore(const char *filename,
1060                                          u64 sb_bytenr, u64 root_tree_bytenr,
1061                                          int writes, int partial)
1062 {
1063         int fp;
1064         struct btrfs_fs_info *info;
1065         int flags = O_CREAT | O_RDWR;
1066         int restore = 1;
1067
1068         if (!writes)
1069                 flags = O_RDONLY;
1070
1071         fp = open(filename, flags, 0600);
1072         if (fp < 0) {
1073                 fprintf (stderr, "Could not open %s\n", filename);
1074                 return NULL;
1075         }
1076         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1077                                writes, partial, restore);
1078         close(fp);
1079         return info;
1080 }
1081
1082 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1083                                          u64 sb_bytenr, u64 root_tree_bytenr,
1084                                          int writes, int partial)
1085 {
1086         int fp;
1087         struct btrfs_fs_info *info;
1088         int flags = O_CREAT | O_RDWR;
1089
1090         if (!writes)
1091                 flags = O_RDONLY;
1092
1093         fp = open(filename, flags, 0600);
1094         if (fp < 0) {
1095                 fprintf (stderr, "Could not open %s\n", filename);
1096                 return NULL;
1097         }
1098         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1099                                writes, partial, 0);
1100         close(fp);
1101         return info;
1102 }
1103
1104 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
1105 {
1106         struct btrfs_fs_info *info;
1107
1108         info = open_ctree_fs_info(filename, sb_bytenr, 0, writes, 0);
1109         if (!info)
1110                 return NULL;
1111         return info->fs_root;
1112 }
1113
1114 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1115                                  int writes)
1116 {
1117         struct btrfs_fs_info *info;
1118         info = __open_ctree_fd(fp, path, sb_bytenr, 0, writes, 0, 0);
1119         if (!info)
1120                 return NULL;
1121         return info->fs_root;
1122 }
1123
1124 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
1125 {
1126         u8 fsid[BTRFS_FSID_SIZE];
1127         int fsid_is_initialized = 0;
1128         struct btrfs_super_block buf;
1129         int i;
1130         int ret;
1131         u64 transid = 0;
1132         u64 bytenr;
1133
1134         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1135                 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
1136                 if (ret < sizeof(buf))
1137                         return -1;
1138
1139                 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
1140                     buf.magic != cpu_to_le64(BTRFS_MAGIC))
1141                         return -1;
1142
1143                 memcpy(sb, &buf, sizeof(*sb));
1144                 return 0;
1145         }
1146
1147         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1148                 bytenr = btrfs_sb_offset(i);
1149                 ret = pread64(fd, &buf, sizeof(buf), bytenr);
1150                 if (ret < sizeof(buf))
1151                         break;
1152
1153                 if (btrfs_super_bytenr(&buf) != bytenr )
1154                         continue;
1155                 /* if magic is NULL, the device was removed */
1156                 if (buf.magic == 0 && i == 0)
1157                         return -1;
1158                 if (buf.magic != cpu_to_le64(BTRFS_MAGIC))
1159                         continue;
1160
1161                 if (!fsid_is_initialized) {
1162                         memcpy(fsid, buf.fsid, sizeof(fsid));
1163                         fsid_is_initialized = 1;
1164                 } else if (memcmp(fsid, buf.fsid, sizeof(fsid))) {
1165                         /*
1166                          * the superblocks (the original one and
1167                          * its backups) contain data of different
1168                          * filesystems -> the super cannot be trusted
1169                          */
1170                         continue;
1171                 }
1172
1173                 if (btrfs_super_generation(&buf) > transid) {
1174                         memcpy(sb, &buf, sizeof(*sb));
1175                         transid = btrfs_super_generation(&buf);
1176                 }
1177         }
1178
1179         return transid > 0 ? 0 : -1;
1180 }
1181
1182 int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
1183                      struct btrfs_device *device)
1184 {
1185         u64 bytenr;
1186         u32 crc;
1187         int i, ret;
1188
1189         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1190                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1191                 crc = ~(u32)0;
1192                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1193                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1194                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1195
1196                 /*
1197                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1198                  * zero filled, we can use it directly
1199                  */
1200                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1201                                 BTRFS_SUPER_INFO_SIZE,
1202                                 root->fs_info->super_bytenr);
1203                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1204                 return 0;
1205         }
1206
1207         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1208                 bytenr = btrfs_sb_offset(i);
1209                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1210                         break;
1211
1212                 btrfs_set_super_bytenr(sb, bytenr);
1213
1214                 crc = ~(u32)0;
1215                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1216                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1217                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1218
1219                 /*
1220                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1221                  * zero filled, we can use it directly
1222                  */
1223                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1224                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1225                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1226         }
1227
1228         return 0;
1229 }
1230
1231 int write_all_supers(struct btrfs_root *root)
1232 {
1233         struct list_head *cur;
1234         struct list_head *head = &root->fs_info->fs_devices->devices;
1235         struct btrfs_device *dev;
1236         struct btrfs_super_block *sb;
1237         struct btrfs_dev_item *dev_item;
1238         int ret;
1239         u64 flags;
1240
1241         sb = root->fs_info->super_copy;
1242         dev_item = &sb->dev_item;
1243         list_for_each(cur, head) {
1244                 dev = list_entry(cur, struct btrfs_device, dev_list);
1245                 if (!dev->writeable)
1246                         continue;
1247
1248                 btrfs_set_stack_device_generation(dev_item, 0);
1249                 btrfs_set_stack_device_type(dev_item, dev->type);
1250                 btrfs_set_stack_device_id(dev_item, dev->devid);
1251                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1252                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1253                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1254                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1255                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1256                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1257                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1258
1259                 flags = btrfs_super_flags(sb);
1260                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1261
1262                 ret = write_dev_supers(root, sb, dev);
1263                 BUG_ON(ret);
1264         }
1265         return 0;
1266 }
1267
1268 int write_ctree_super(struct btrfs_trans_handle *trans,
1269                       struct btrfs_root *root)
1270 {
1271         int ret;
1272         struct btrfs_root *tree_root = root->fs_info->tree_root;
1273         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1274
1275         if (root->fs_info->readonly)
1276                 return 0;
1277
1278         btrfs_set_super_generation(root->fs_info->super_copy,
1279                                    trans->transid);
1280         btrfs_set_super_root(root->fs_info->super_copy,
1281                              tree_root->node->start);
1282         btrfs_set_super_root_level(root->fs_info->super_copy,
1283                                    btrfs_header_level(tree_root->node));
1284         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1285                                    chunk_root->node->start);
1286         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1287                                          btrfs_header_level(chunk_root->node));
1288         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1289                                 btrfs_header_generation(chunk_root->node));
1290
1291         ret = write_all_supers(root);
1292         if (ret)
1293                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1294         return ret;
1295 }
1296
1297 int close_ctree(struct btrfs_root *root)
1298 {
1299         int ret;
1300         struct btrfs_trans_handle *trans;
1301         struct btrfs_fs_info *fs_info = root->fs_info;
1302
1303         if (fs_info->last_trans_committed !=
1304             fs_info->generation) {
1305                 trans = btrfs_start_transaction(root, 1);
1306                 btrfs_commit_transaction(trans, root);
1307                 trans = btrfs_start_transaction(root, 1);
1308                 ret = commit_tree_roots(trans, fs_info);
1309                 BUG_ON(ret);
1310                 ret = __commit_transaction(trans, root);
1311                 BUG_ON(ret);
1312                 write_ctree_super(trans, root);
1313                 btrfs_free_transaction(root, trans);
1314         }
1315         btrfs_free_block_groups(fs_info);
1316
1317         free_fs_roots_tree(&fs_info->fs_root_tree);
1318
1319         btrfs_release_all_roots(fs_info);
1320         btrfs_close_devices(fs_info->fs_devices);
1321         btrfs_cleanup_all_caches(fs_info);
1322         btrfs_free_fs_info(fs_info);
1323         return 0;
1324 }
1325
1326 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1327                      struct extent_buffer *eb)
1328 {
1329         return clear_extent_buffer_dirty(eb);
1330 }
1331
1332 int wait_on_tree_block_writeback(struct btrfs_root *root,
1333                                  struct extent_buffer *eb)
1334 {
1335         return 0;
1336 }
1337
1338 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1339 {
1340         set_extent_buffer_dirty(eb);
1341 }
1342
1343 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1344 {
1345         int ret;
1346
1347         ret = extent_buffer_uptodate(buf);
1348         if (!ret)
1349                 return ret;
1350
1351         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1352         return !ret;
1353 }
1354
1355 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1356 {
1357         return set_extent_buffer_uptodate(eb);
1358 }