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         if (buf->start != btrfs_header_bytenr(buf))
  41                 return 1;
  42
  43         if (memcmp_extent_buffer(buf, root->fs_info->fsid,
  44                                  (unsigned long)btrfs_header_fsid(buf),
  45                                  BTRFS_FSID_SIZE))
  46                 return 1;
  47         return 0;
  48 }
  49
  50 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  51 {
  52         return crc32c(seed, data, len);
  53 }
  54
  55 void btrfs_csum_final(u32 crc, char *result)
  56 {
  57         *(__le32 *)result = ~cpu_to_le32(crc);
  58 }
  59
  60 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
  61                     int verify)
  62 {
  63         char result[BTRFS_CRC32_SIZE];
  64         u32 len;
  65         u32 crc = ~(u32)0;
  66
  67         len = buf->len - BTRFS_CSUM_SIZE;
  68         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  69         btrfs_csum_final(crc, result);
  70
  71         if (verify) {
  72                 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
  73                         printk("checksum verify failed on %llu wanted %X "
  74                                "found %X\n", (unsigned long long)buf->start,
  75                                *((int *)result), *((int *)buf));
  76                         return 1;
  77                 }
  78         } else {
  79                 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
  80         }
  81         return 0;
  82 }
  83
  84 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  85                                             u64 bytenr, u32 blocksize)
  86 {
  87         return find_extent_buffer(&root->fs_info->extent_cache,
  88                                   bytenr, blocksize);
  89 }
  90
  91 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  92                                                  u64 bytenr, u32 blocksize)
  93 {
  94         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
  95                                    blocksize);
  96 }
  97
  98 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  99                          u64 parent_transid)
 100 {
 101         int ret;
 102         int dev_nr;
 103         struct extent_buffer *eb;
 104         u64 length;
 105         struct btrfs_multi_bio *multi = NULL;
 106         struct btrfs_device *device;
 107
 108         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 109         if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
 110                 free_extent_buffer(eb);
 111                 return 0;
 112         }
 113
 114         dev_nr = 0;
 115         length = blocksize;
 116         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 117                               bytenr, &length, &multi, 0);
 118         BUG_ON(ret);
 119         device = multi->stripes[0].dev;
 120         device->total_ios++;
 121         blocksize = min(blocksize, (u32)(64 * 1024));
 122         readahead(device->fd, multi->stripes[0].physical, blocksize);
 123         kfree(multi);
 124         return 0;
 125 }
 126
 127 static int verify_parent_transid(struct extent_io_tree *io_tree,
 128                                  struct extent_buffer *eb, u64 parent_transid)
 129 {
 130         int ret;
 131
 132         if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
 133                 return 0;
 134
 135         if (extent_buffer_uptodate(eb) &&
 136             btrfs_header_generation(eb) == parent_transid) {
 137                 ret = 0;
 138                 goto out;
 139         }
 140         printk("parent transid verify failed on %llu wanted %llu found %llu\n",
 141                (unsigned long long)eb->start,
 142                (unsigned long long)parent_transid,
 143                (unsigned long long)btrfs_header_generation(eb));
 144         ret = 1;
 145 out:
 146         clear_extent_buffer_uptodate(io_tree, eb);
 147         return ret;
 148
 149 }
 150
 151
 152 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 153                                      u32 blocksize, u64 parent_transid)
 154 {
 155         int ret;
 156         int dev_nr;
 157         struct extent_buffer *eb;
 158         u64 length;
 159         struct btrfs_multi_bio *multi = NULL;
 160         struct btrfs_device *device;
 161         int mirror_num = 0;
 162         int num_copies;
 163
 164         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 165         if (!eb)
 166                 return NULL;
 167
 168         if (btrfs_buffer_uptodate(eb, parent_transid))
 169                 return eb;
 170
 171         dev_nr = 0;
 172         length = blocksize;
 173         while (1) {
 174                 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 175                                       eb->start, &length, &multi, mirror_num);
 176                 BUG_ON(ret);
 177                 device = multi->stripes[0].dev;
 178                 eb->fd = device->fd;
 179                 device->total_ios++;
 180                 eb->dev_bytenr = multi->stripes[0].physical;
 181                 kfree(multi);
 182                 ret = read_extent_from_disk(eb);
 183                 if (ret == 0 && check_tree_block(root, eb) == 0 &&
 184                     csum_tree_block(root, eb, 1) == 0 &&
 185                     verify_parent_transid(eb->tree, eb, parent_transid) == 0) {
 186                         btrfs_set_buffer_uptodate(eb);
 187                         return eb;
 188                 }
 189                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 190                                               eb->start, eb->len);
 191                 if (num_copies == 1) {
 192                         break;
 193                 }
 194                 mirror_num++;
 195                 if (mirror_num > num_copies) {
 196                         break;
 197                 }
 198         }
 199         free_extent_buffer(eb);
 200         return NULL;
 201 }
 202
 203 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 204                      struct extent_buffer *eb)
 205 {
 206         int ret;
 207         int dev_nr;
 208         u64 length;
 209         struct btrfs_multi_bio *multi = NULL;
 210
 211         if (check_tree_block(root, eb))
 212                 BUG();
 213         if (!btrfs_buffer_uptodate(eb, trans->transid))
 214                 BUG();
 215
 216         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 217         csum_tree_block(root, eb, 0);
 218
 219         dev_nr = 0;
 220         length = eb->len;
 221         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 222                               eb->start, &length, &multi, 0);
 223
 224         while(dev_nr < multi->num_stripes) {
 225                 BUG_ON(ret);
 226                 eb->fd = multi->stripes[dev_nr].dev->fd;
 227                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 228                 multi->stripes[dev_nr].dev->total_ios++;
 229                 dev_nr++;
 230                 ret = write_extent_to_disk(eb);
 231                 BUG_ON(ret);
 232         }
 233         kfree(multi);
 234         return 0;
 235 }
 236
 237 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 238                         u32 stripesize, struct btrfs_root *root,
 239                         struct btrfs_fs_info *fs_info, u64 objectid)
 240 {
 241         root->node = NULL;
 242         root->commit_root = NULL;
 243         root->sectorsize = sectorsize;
 244         root->nodesize = nodesize;
 245         root->leafsize = leafsize;
 246         root->stripesize = stripesize;
 247         root->ref_cows = 0;
 248         root->track_dirty = 0;
 249
 250         root->fs_info = fs_info;
 251         root->objectid = objectid;
 252         root->last_trans = 0;
 253         root->highest_inode = 0;
 254         root->last_inode_alloc = 0;
 255
 256         INIT_LIST_HEAD(&root->dirty_list);
 257         memset(&root->root_key, 0, sizeof(root->root_key));
 258         memset(&root->root_item, 0, sizeof(root->root_item));
 259         root->root_key.objectid = objectid;
 260         return 0;
 261 }
 262
 263 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 264                                struct btrfs_root *root)
 265 {
 266         int ret;
 267         u64 old_root_bytenr;
 268         struct btrfs_root *tree_root = root->fs_info->tree_root;
 269
 270         btrfs_write_dirty_block_groups(trans, root);
 271         while(1) {
 272                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 273                 if (old_root_bytenr == root->node->start)
 274                         break;
 275                 btrfs_set_root_bytenr(&root->root_item,
 276                                        root->node->start);
 277                 btrfs_set_root_generation(&root->root_item,
 278                                           trans->transid);
 279                 root->root_item.level = btrfs_header_level(root->node);
 280                 ret = btrfs_update_root(trans, tree_root,
 281                                         &root->root_key,
 282                                         &root->root_item);
 283                 BUG_ON(ret);
 284                 btrfs_write_dirty_block_groups(trans, root);
 285         }
 286         return 0;
 287 }
 288
 289 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 290                              struct btrfs_fs_info *fs_info)
 291 {
 292         struct btrfs_root *root;
 293         struct list_head *next;
 294         struct extent_buffer *eb;
 295
 296         eb = fs_info->tree_root->node;
 297         extent_buffer_get(eb);
 298         btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 299         free_extent_buffer(eb);
 300
 301         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 302                 next = fs_info->dirty_cowonly_roots.next;
 303                 list_del_init(next);
 304                 root = list_entry(next, struct btrfs_root, dirty_list);
 305                 update_cowonly_root(trans, root);
 306         }
 307         return 0;
 308 }
 309
 310 static int __commit_transaction(struct btrfs_trans_handle *trans,
 311                                 struct btrfs_root *root)
 312 {
 313         u64 start;
 314         u64 end;
 315         struct extent_buffer *eb;
 316         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 317         int ret;
 318
 319         while(1) {
 320                 ret = find_first_extent_bit(tree, 0, &start, &end,
 321                                             EXTENT_DIRTY);
 322                 if (ret)
 323                         break;
 324                 while(start <= end) {
 325                         eb = find_first_extent_buffer(tree, start);
 326                         BUG_ON(!eb || eb->start != start);
 327                         ret = write_tree_block(trans, root, eb);
 328                         BUG_ON(ret);
 329                         start += eb->len;
 330                         clear_extent_buffer_dirty(eb);
 331                         free_extent_buffer(eb);
 332                 }
 333         }
 334         return 0;
 335 }
 336
 337 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 338                              struct btrfs_root *root)
 339 {
 340         int ret = 0;
 341         struct btrfs_root *new_root = NULL;
 342         struct btrfs_fs_info *fs_info = root->fs_info;
 343
 344         if (root->commit_root == root->node)
 345                 goto commit_tree;
 346
 347         new_root = malloc(sizeof(*new_root));
 348         if (!new_root)
 349                 return -ENOMEM;
 350         memcpy(new_root, root, sizeof(*new_root));
 351         new_root->node = root->commit_root;
 352         root->commit_root = NULL;
 353
 354         root->root_key.offset = trans->transid;
 355         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 356         btrfs_set_root_generation(&root->root_item, root->root_key.offset);
 357         root->root_item.level = btrfs_header_level(root->node);
 358         ret = btrfs_insert_root(trans, fs_info->tree_root,
 359                                 &root->root_key, &root->root_item);
 360         BUG_ON(ret);
 361
 362         btrfs_set_root_refs(&new_root->root_item, 0);
 363         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 364                                 &new_root->root_key, &new_root->root_item);
 365         BUG_ON(ret);
 366
 367         ret = commit_tree_roots(trans, fs_info);
 368         BUG_ON(ret);
 369         ret = __commit_transaction(trans, root);
 370         BUG_ON(ret);
 371         write_ctree_super(trans, root);
 372         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 373                                    &fs_info->pinned_extents);
 374         btrfs_free_transaction(root, trans);
 375         fs_info->running_transaction = NULL;
 376
 377         trans = btrfs_start_transaction(root, 1);
 378         ret = btrfs_drop_snapshot(trans, new_root);
 379         BUG_ON(ret);
 380         ret = btrfs_del_root(trans, fs_info->tree_root, &new_root->root_key);
 381         BUG_ON(ret);
 382 commit_tree:
 383         ret = commit_tree_roots(trans, fs_info);
 384         BUG_ON(ret);
 385         ret = __commit_transaction(trans, root);
 386         BUG_ON(ret);
 387         write_ctree_super(trans, root);
 388         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 389                                    &fs_info->pinned_extents);
 390         btrfs_free_transaction(root, trans);
 391         free_extent_buffer(root->commit_root);
 392         root->commit_root = NULL;
 393         fs_info->running_transaction = NULL;
 394         if (new_root) {
 395                 free_extent_buffer(new_root->node);
 396                 free(new_root);
 397         }
 398         return 0;
 399 }
 400
 401 static int find_and_setup_root(struct btrfs_root *tree_root,
 402                                struct btrfs_fs_info *fs_info,
 403                                u64 objectid, struct btrfs_root *root)
 404 {
 405         int ret;
 406         u32 blocksize;
 407         u64 generation;
 408
 409         __setup_root(tree_root->nodesize, tree_root->leafsize,
 410                      tree_root->sectorsize, tree_root->stripesize,
 411                      root, fs_info, objectid);
 412         ret = btrfs_find_last_root(tree_root, objectid,
 413                                    &root->root_item, &root->root_key);
 414         BUG_ON(ret);
 415
 416         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 417         generation = btrfs_root_generation(&root->root_item);
 418         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 419                                      blocksize, generation);
 420         BUG_ON(!root->node);
 421         return 0;
 422 }
 423
 424 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 425 {
 426         if (root->node)
 427                 free_extent_buffer(root->node);
 428         if (root->commit_root)
 429                 free_extent_buffer(root->commit_root);
 430
 431         free(root);
 432         return 0;
 433 }
 434
 435 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 436                                       struct btrfs_key *location)
 437 {
 438         struct btrfs_root *root;
 439         struct btrfs_root *tree_root = fs_info->tree_root;
 440         struct btrfs_path *path;
 441         struct extent_buffer *l;
 442         u64 generation;
 443         u32 blocksize;
 444         int ret = 0;
 445
 446         root = malloc(sizeof(*root));
 447         if (!root)
 448                 return ERR_PTR(-ENOMEM);
 449         memset(root, 0, sizeof(*root));
 450         if (location->offset == (u64)-1) {
 451                 ret = find_and_setup_root(tree_root, fs_info,
 452                                           location->objectid, root);
 453                 if (ret) {
 454                         free(root);
 455                         return ERR_PTR(ret);
 456                 }
 457                 goto insert;
 458         }
 459
 460         __setup_root(tree_root->nodesize, tree_root->leafsize,
 461                      tree_root->sectorsize, tree_root->stripesize,
 462                      root, fs_info, location->objectid);
 463
 464         path = btrfs_alloc_path();
 465         BUG_ON(!path);
 466         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 467         if (ret != 0) {
 468                 if (ret > 0)
 469                         ret = -ENOENT;
 470                 goto out;
 471         }
 472         l = path->nodes[0];
 473         read_extent_buffer(l, &root->root_item,
 474                btrfs_item_ptr_offset(l, path->slots[0]),
 475                sizeof(root->root_item));
 476         memcpy(&root->root_key, location, sizeof(*location));
 477         ret = 0;
 478 out:
 479         btrfs_release_path(root, path);
 480         btrfs_free_path(path);
 481         if (ret) {
 482                 free(root);
 483                 return ERR_PTR(ret);
 484         }
 485         generation = btrfs_root_generation(&root->root_item);
 486         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 487         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 488                                      blocksize, generation);
 489         BUG_ON(!root->node);
 490 insert:
 491         root->ref_cows = 1;
 492         return root;
 493 }
 494
 495 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
 496 {
 497         int fp;
 498         struct btrfs_root *root;
 499         int flags = O_CREAT | O_RDWR;
 500
 501         if (!writes)
 502                 flags = O_RDONLY;
 503
 504         fp = open(filename, flags, 0600);
 505         if (fp < 0) {
 506                 return NULL;
 507         }
 508         root = open_ctree_fd(fp, filename, sb_bytenr, writes);
 509         close(fp);
 510
 511         return root;
 512 }
 513
 514 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
 515                                  int writes)
 516 {
 517         u32 sectorsize;
 518         u32 nodesize;
 519         u32 leafsize;
 520         u32 blocksize;
 521         u32 stripesize;
 522         u64 generation;
 523         struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
 524         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 525         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 526         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 527         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 528         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 529         int ret;
 530         struct btrfs_super_block *disk_super;
 531         struct btrfs_fs_devices *fs_devices = NULL;
 532         u64 total_devs;
 533
 534         if (sb_bytenr == 0)
 535                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 536
 537         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 538                                     &total_devs, sb_bytenr);
 539
 540         if (ret) {
 541                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 542                 return NULL;
 543         }
 544
 545         if (total_devs != 1) {
 546                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 547                 BUG_ON(ret);
 548         }
 549
 550         memset(fs_info, 0, sizeof(*fs_info));
 551         fs_info->fs_root = root;
 552         fs_info->tree_root = tree_root;
 553         fs_info->extent_root = extent_root;
 554         fs_info->chunk_root = chunk_root;
 555         fs_info->dev_root = dev_root;
 556
 557         if (!writes)
 558                 fs_info->readonly = 1;
 559
 560         extent_io_tree_init(&fs_info->extent_cache);
 561         extent_io_tree_init(&fs_info->free_space_cache);
 562         extent_io_tree_init(&fs_info->block_group_cache);
 563         extent_io_tree_init(&fs_info->pinned_extents);
 564         extent_io_tree_init(&fs_info->pending_del);
 565         extent_io_tree_init(&fs_info->extent_ins);
 566
 567         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 568
 569         mutex_init(&fs_info->fs_mutex);
 570         fs_info->fs_devices = fs_devices;
 571         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 572         INIT_LIST_HEAD(&fs_info->space_info);
 573
 574         __setup_root(4096, 4096, 4096, 4096, tree_root,
 575                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 576
 577         if (writes)
 578                 ret = btrfs_open_devices(fs_devices, O_RDWR);
 579         else
 580                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
 581         BUG_ON(ret);
 582
 583         ret = btrfs_bootstrap_super_map(&fs_info->mapping_tree, fs_devices);
 584         BUG_ON(ret);
 585         fs_info->sb_buffer = btrfs_find_create_tree_block(tree_root, sb_bytenr,
 586                                                           4096);
 587         BUG_ON(!fs_info->sb_buffer);
 588         fs_info->sb_buffer->fd = fs_devices->latest_bdev;
 589         fs_info->sb_buffer->dev_bytenr = sb_bytenr;
 590         ret = read_extent_from_disk(fs_info->sb_buffer);
 591         BUG_ON(ret);
 592         btrfs_set_buffer_uptodate(fs_info->sb_buffer);
 593
 594         read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
 595                            sizeof(fs_info->super_copy));
 596         read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
 597                            (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
 598                            BTRFS_FSID_SIZE);
 599
 600         disk_super = &fs_info->super_copy;
 601         if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
 602                     sizeof(disk_super->magic))) {
 603                 printk("No valid btrfs found\n");
 604                 BUG_ON(1);
 605         }
 606         nodesize = btrfs_super_nodesize(disk_super);
 607         leafsize = btrfs_super_leafsize(disk_super);
 608         sectorsize = btrfs_super_sectorsize(disk_super);
 609         stripesize = btrfs_super_stripesize(disk_super);
 610         tree_root->nodesize = nodesize;
 611         tree_root->leafsize = leafsize;
 612         tree_root->sectorsize = sectorsize;
 613         tree_root->stripesize = stripesize;
 614
 615         ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
 616         BUG_ON(ret);
 617         ret = btrfs_read_sys_array(tree_root);
 618         BUG_ON(ret);
 619         blocksize = btrfs_level_size(tree_root,
 620                                      btrfs_super_chunk_root_level(disk_super));
 621         generation = btrfs_super_chunk_root_generation(disk_super);
 622
 623         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 624                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 625
 626         chunk_root->node = read_tree_block(chunk_root,
 627                                            btrfs_super_chunk_root(disk_super),
 628                                            blocksize, generation);
 629
 630         BUG_ON(!chunk_root->node);
 631
 632         read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
 633                  (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
 634                  BTRFS_UUID_SIZE);
 635
 636         ret = btrfs_read_chunk_tree(chunk_root);
 637         BUG_ON(ret);
 638
 639         blocksize = btrfs_level_size(tree_root,
 640                                      btrfs_super_root_level(disk_super));
 641         generation = btrfs_super_generation(disk_super);
 642
 643         tree_root->node = read_tree_block(tree_root,
 644                                           btrfs_super_root(disk_super),
 645                                           blocksize, generation);
 646         BUG_ON(!tree_root->node);
 647         ret = find_and_setup_root(tree_root, fs_info,
 648                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 649         BUG_ON(ret);
 650         extent_root->track_dirty = 1;
 651
 652         ret = find_and_setup_root(tree_root, fs_info,
 653                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 654         BUG_ON(ret);
 655         dev_root->track_dirty = 1;
 656
 657         ret = find_and_setup_root(tree_root, fs_info,
 658                                   BTRFS_FS_TREE_OBJECTID, root);
 659         BUG_ON(ret);
 660         root->ref_cows = 1;
 661         fs_info->generation = btrfs_super_generation(disk_super) + 1;
 662         btrfs_read_block_groups(root);
 663
 664         fs_info->data_alloc_profile = (u64)-1;
 665         fs_info->metadata_alloc_profile = (u64)-1;
 666         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 667
 668         return root;
 669 }
 670
 671 int write_all_supers(struct btrfs_root *root)
 672 {
 673         struct list_head *cur;
 674         struct list_head *head = &root->fs_info->fs_devices->devices;
 675         struct btrfs_device *dev;
 676         struct extent_buffer *sb;
 677         struct btrfs_dev_item *dev_item;
 678         int ret;
 679
 680         sb = root->fs_info->sb_buffer;
 681         dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
 682                                                       dev_item);
 683         list_for_each(cur, head) {
 684                 dev = list_entry(cur, struct btrfs_device, dev_list);
 685                 btrfs_set_device_type(sb, dev_item, dev->type);
 686                 btrfs_set_device_id(sb, dev_item, dev->devid);
 687                 btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
 688                 btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
 689                 btrfs_set_device_io_align(sb, dev_item, dev->io_align);
 690                 btrfs_set_device_io_width(sb, dev_item, dev->io_width);
 691                 btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
 692                 write_extent_buffer(sb, dev->uuid,
 693                                     (unsigned long)btrfs_device_uuid(dev_item),
 694                                     BTRFS_UUID_SIZE);
 695                 sb->fd = dev->fd;
 696                 sb->dev_bytenr = sb->start;
 697                 btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
 698                 csum_tree_block(root, sb, 0);
 699                 ret = write_extent_to_disk(sb);
 700                 BUG_ON(ret);
 701         }
 702         return 0;
 703 }
 704
 705 int write_ctree_super(struct btrfs_trans_handle *trans,
 706                       struct btrfs_root *root)
 707 {
 708         int ret;
 709         struct btrfs_root *tree_root = root->fs_info->tree_root;
 710         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
 711
 712         if (root->fs_info->readonly)
 713                 return 0;
 714
 715         btrfs_set_super_generation(&root->fs_info->super_copy,
 716                                    trans->transid);
 717         btrfs_set_super_root(&root->fs_info->super_copy,
 718                              tree_root->node->start);
 719         btrfs_set_super_root_level(&root->fs_info->super_copy,
 720                                    btrfs_header_level(tree_root->node));
 721         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
 722                                    chunk_root->node->start);
 723         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
 724                                          btrfs_header_level(chunk_root->node));
 725         btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
 726                                 btrfs_header_generation(chunk_root->node));
 727         write_extent_buffer(root->fs_info->sb_buffer,
 728                             &root->fs_info->super_copy, 0,
 729                             sizeof(root->fs_info->super_copy));
 730         ret = write_all_supers(root);
 731         if (ret)
 732                 fprintf(stderr, "failed to write new super block err %d\n", ret);
 733         return ret;
 734 }
 735
 736 static int close_all_devices(struct btrfs_fs_info *fs_info)
 737 {
 738         struct list_head *list;
 739         struct list_head *next;
 740         struct btrfs_device *device;
 741
 742         return 0;
 743
 744         list = &fs_info->fs_devices->devices;
 745         list_for_each(next, list) {
 746                 device = list_entry(next, struct btrfs_device, dev_list);
 747                 close(device->fd);
 748         }
 749         return 0;
 750 }
 751
 752 int close_ctree(struct btrfs_root *root)
 753 {
 754         int ret;
 755         struct btrfs_trans_handle *trans;
 756         struct btrfs_fs_info *fs_info = root->fs_info;
 757
 758         trans = btrfs_start_transaction(root, 1);
 759         btrfs_commit_transaction(trans, root);
 760         trans = btrfs_start_transaction(root, 1);
 761         ret = commit_tree_roots(trans, root->fs_info);
 762         BUG_ON(ret);
 763         ret = __commit_transaction(trans, root);
 764         BUG_ON(ret);
 765         write_ctree_super(trans, root);
 766         btrfs_free_transaction(root, trans);
 767         btrfs_free_block_groups(root->fs_info);
 768         if (root->node)
 769                 free_extent_buffer(root->node);
 770         if (root->fs_info->extent_root->node)
 771                 free_extent_buffer(root->fs_info->extent_root->node);
 772         if (root->fs_info->tree_root->node)
 773                 free_extent_buffer(root->fs_info->tree_root->node);
 774         free_extent_buffer(root->commit_root);
 775         free_extent_buffer(root->fs_info->sb_buffer);
 776
 777         if (root->fs_info->chunk_root->node);
 778                 free_extent_buffer(root->fs_info->chunk_root->node);
 779
 780         if (root->fs_info->dev_root->node);
 781                 free_extent_buffer(root->fs_info->dev_root->node);
 782
 783         close_all_devices(root->fs_info);
 784         extent_io_tree_cleanup(&fs_info->extent_cache);
 785         extent_io_tree_cleanup(&fs_info->free_space_cache);
 786         extent_io_tree_cleanup(&fs_info->block_group_cache);
 787         extent_io_tree_cleanup(&fs_info->pinned_extents);
 788         extent_io_tree_cleanup(&fs_info->pending_del);
 789         extent_io_tree_cleanup(&fs_info->extent_ins);
 790
 791         free(fs_info->tree_root);
 792         free(fs_info->extent_root);
 793         free(fs_info->fs_root);
 794         free(fs_info->chunk_root);
 795         free(fs_info->dev_root);
 796         free(fs_info);
 797
 798         return 0;
 799 }
 800
 801 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 802                      struct extent_buffer *eb)
 803 {
 804         return clear_extent_buffer_dirty(eb);
 805 }
 806
 807 int wait_on_tree_block_writeback(struct btrfs_root *root,
 808                                  struct extent_buffer *eb)
 809 {
 810         return 0;
 811 }
 812
 813 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
 814 {
 815         set_extent_buffer_dirty(eb);
 816 }
 817
 818 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
 819 {
 820         int ret;
 821
 822         ret = extent_buffer_uptodate(buf);
 823         if (!ret)
 824                 return ret;
 825
 826         ret = verify_parent_transid(buf->tree, buf, parent_transid);
 827         return !ret;
 828 }
 829
 830 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
 831 {
 832         return set_extent_buffer_uptodate(eb);
 833 }