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                 root->root_item.level = btrfs_header_level(root->node);
 278                 ret = btrfs_update_root(trans, tree_root,
 279                                         &root->root_key,
 280                                         &root->root_item);
 281                 BUG_ON(ret);
 282                 btrfs_write_dirty_block_groups(trans, root);
 283         }
 284         return 0;
 285 }
 286
 287 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 288                              struct btrfs_fs_info *fs_info)
 289 {
 290         struct btrfs_root *root;
 291         struct list_head *next;
 292
 293         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 294                 next = fs_info->dirty_cowonly_roots.next;
 295                 list_del_init(next);
 296                 root = list_entry(next, struct btrfs_root, dirty_list);
 297                 update_cowonly_root(trans, root);
 298         }
 299         return 0;
 300 }
 301
 302 static int __commit_transaction(struct btrfs_trans_handle *trans,
 303                                 struct btrfs_root *root)
 304 {
 305         u64 start;
 306         u64 end;
 307         struct extent_buffer *eb;
 308         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 309         int ret;
 310
 311         while(1) {
 312                 ret = find_first_extent_bit(tree, 0, &start, &end,
 313                                             EXTENT_DIRTY);
 314                 if (ret)
 315                         break;
 316                 while(start <= end) {
 317                         eb = find_first_extent_buffer(tree, start);
 318                         BUG_ON(!eb || eb->start != start);
 319                         ret = write_tree_block(trans, root, eb);
 320                         BUG_ON(ret);
 321                         start += eb->len;
 322                         clear_extent_buffer_dirty(eb);
 323                         free_extent_buffer(eb);
 324                 }
 325         }
 326         return 0;
 327 }
 328
 329 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 330                              struct btrfs_root *root)
 331 {
 332         int ret = 0;
 333         struct btrfs_root *new_root = NULL;
 334         struct btrfs_fs_info *fs_info = root->fs_info;
 335
 336         if (root->commit_root == root->node)
 337                 goto commit_tree;
 338
 339         new_root = malloc(sizeof(*new_root));
 340         if (!new_root)
 341                 return -ENOMEM;
 342         memcpy(new_root, root, sizeof(*new_root));
 343         new_root->node = root->commit_root;
 344         root->commit_root = NULL;
 345
 346         root->root_key.offset = trans->transid;
 347         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 348         root->root_item.level = btrfs_header_level(root->node);
 349         ret = btrfs_insert_root(trans, fs_info->tree_root,
 350                                 &root->root_key, &root->root_item);
 351         BUG_ON(ret);
 352
 353         btrfs_set_root_refs(&new_root->root_item, 0);
 354         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 355                                 &new_root->root_key, &new_root->root_item);
 356         BUG_ON(ret);
 357
 358         ret = commit_tree_roots(trans, fs_info);
 359         BUG_ON(ret);
 360         ret = __commit_transaction(trans, root);
 361         BUG_ON(ret);
 362         write_ctree_super(trans, root);
 363         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 364                                    &fs_info->pinned_extents);
 365         btrfs_free_transaction(root, trans);
 366         fs_info->running_transaction = NULL;
 367
 368         trans = btrfs_start_transaction(root, 1);
 369         ret = btrfs_drop_snapshot(trans, new_root);
 370         BUG_ON(ret);
 371         ret = btrfs_del_root(trans, fs_info->tree_root, &new_root->root_key);
 372         BUG_ON(ret);
 373 commit_tree:
 374         ret = commit_tree_roots(trans, fs_info);
 375         BUG_ON(ret);
 376         ret = __commit_transaction(trans, root);
 377         BUG_ON(ret);
 378         write_ctree_super(trans, root);
 379         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 380                                    &fs_info->pinned_extents);
 381         btrfs_free_transaction(root, trans);
 382         free_extent_buffer(root->commit_root);
 383         root->commit_root = NULL;
 384         fs_info->running_transaction = NULL;
 385         if (new_root) {
 386                 free_extent_buffer(new_root->node);
 387                 free(new_root);
 388         }
 389         return 0;
 390 }
 391
 392 static int find_and_setup_root(struct btrfs_root *tree_root,
 393                                struct btrfs_fs_info *fs_info,
 394                                u64 objectid, struct btrfs_root *root)
 395 {
 396         int ret;
 397         u32 blocksize;
 398
 399         __setup_root(tree_root->nodesize, tree_root->leafsize,
 400                      tree_root->sectorsize, tree_root->stripesize,
 401                      root, fs_info, objectid);
 402         ret = btrfs_find_last_root(tree_root, objectid,
 403                                    &root->root_item, &root->root_key);
 404         BUG_ON(ret);
 405
 406         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 407         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 408                                      blocksize, 0);
 409         BUG_ON(!root->node);
 410         return 0;
 411 }
 412
 413 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 414 {
 415         if (root->node)
 416                 free_extent_buffer(root->node);
 417         if (root->commit_root)
 418                 free_extent_buffer(root->commit_root);
 419
 420         free(root);
 421         return 0;
 422 }
 423
 424 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 425                                       struct btrfs_key *location)
 426 {
 427         struct btrfs_root *root;
 428         struct btrfs_root *tree_root = fs_info->tree_root;
 429         struct btrfs_path *path;
 430         struct extent_buffer *l;
 431         u32 blocksize;
 432         int ret = 0;
 433
 434         root = malloc(sizeof(*root));
 435         if (!root)
 436                 return ERR_PTR(-ENOMEM);
 437         memset(root, 0, sizeof(*root));
 438         if (location->offset == (u64)-1) {
 439                 ret = find_and_setup_root(tree_root, fs_info,
 440                                           location->objectid, root);
 441                 if (ret) {
 442                         free(root);
 443                         return ERR_PTR(ret);
 444                 }
 445                 goto insert;
 446         }
 447
 448         __setup_root(tree_root->nodesize, tree_root->leafsize,
 449                      tree_root->sectorsize, tree_root->stripesize,
 450                      root, fs_info, location->objectid);
 451
 452         path = btrfs_alloc_path();
 453         BUG_ON(!path);
 454         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 455         if (ret != 0) {
 456                 if (ret > 0)
 457                         ret = -ENOENT;
 458                 goto out;
 459         }
 460         l = path->nodes[0];
 461         read_extent_buffer(l, &root->root_item,
 462                btrfs_item_ptr_offset(l, path->slots[0]),
 463                sizeof(root->root_item));
 464         memcpy(&root->root_key, location, sizeof(*location));
 465         ret = 0;
 466 out:
 467         btrfs_release_path(root, path);
 468         btrfs_free_path(path);
 469         if (ret) {
 470                 free(root);
 471                 return ERR_PTR(ret);
 472         }
 473         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 474         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 475                                      blocksize, 0);
 476         BUG_ON(!root->node);
 477 insert:
 478         root->ref_cows = 1;
 479         return root;
 480 }
 481
 482 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
 483 {
 484         int fp;
 485         struct btrfs_root *root;
 486         int flags = O_CREAT | O_RDWR;
 487
 488         if (!writes)
 489                 flags = O_RDONLY;
 490
 491         fp = open(filename, flags, 0600);
 492         if (fp < 0) {
 493                 return NULL;
 494         }
 495         root = open_ctree_fd(fp, filename, sb_bytenr, writes);
 496         close(fp);
 497
 498         return root;
 499 }
 500
 501 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
 502                                  int writes)
 503 {
 504         u32 sectorsize;
 505         u32 nodesize;
 506         u32 leafsize;
 507         u32 blocksize;
 508         u32 stripesize;
 509         struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
 510         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 511         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 512         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 513         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 514         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 515         int ret;
 516         struct btrfs_super_block *disk_super;
 517         struct btrfs_fs_devices *fs_devices = NULL;
 518         u64 total_devs;
 519
 520         if (sb_bytenr == 0)
 521                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 522
 523         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 524                                     &total_devs, sb_bytenr);
 525
 526         if (ret) {
 527                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 528                 return NULL;
 529         }
 530
 531         if (total_devs != 1) {
 532                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 533                 BUG_ON(ret);
 534         }
 535
 536         memset(fs_info, 0, sizeof(*fs_info));
 537         fs_info->fs_root = root;
 538         fs_info->tree_root = tree_root;
 539         fs_info->extent_root = extent_root;
 540         fs_info->chunk_root = chunk_root;
 541         fs_info->dev_root = dev_root;
 542
 543         if (!writes)
 544                 fs_info->readonly = 1;
 545
 546         extent_io_tree_init(&fs_info->extent_cache);
 547         extent_io_tree_init(&fs_info->free_space_cache);
 548         extent_io_tree_init(&fs_info->block_group_cache);
 549         extent_io_tree_init(&fs_info->pinned_extents);
 550         extent_io_tree_init(&fs_info->pending_del);
 551         extent_io_tree_init(&fs_info->extent_ins);
 552
 553         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 554
 555         mutex_init(&fs_info->fs_mutex);
 556         fs_info->fs_devices = fs_devices;
 557         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 558         INIT_LIST_HEAD(&fs_info->space_info);
 559
 560         __setup_root(4096, 4096, 4096, 4096, tree_root,
 561                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 562
 563         if (writes)
 564                 ret = btrfs_open_devices(fs_devices, O_RDWR);
 565         else
 566                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
 567         BUG_ON(ret);
 568
 569         ret = btrfs_bootstrap_super_map(&fs_info->mapping_tree, fs_devices);
 570         BUG_ON(ret);
 571         fs_info->sb_buffer = btrfs_find_create_tree_block(tree_root, sb_bytenr,
 572                                                           4096);
 573         BUG_ON(!fs_info->sb_buffer);
 574         fs_info->sb_buffer->fd = fs_devices->latest_bdev;
 575         fs_info->sb_buffer->dev_bytenr = sb_bytenr;
 576         ret = read_extent_from_disk(fs_info->sb_buffer);
 577         BUG_ON(ret);
 578         btrfs_set_buffer_uptodate(fs_info->sb_buffer);
 579
 580         read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
 581                            sizeof(fs_info->super_copy));
 582         read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
 583                            (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
 584                            BTRFS_FSID_SIZE);
 585
 586         disk_super = &fs_info->super_copy;
 587         if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
 588                     sizeof(disk_super->magic))) {
 589                 printk("No valid btrfs found\n");
 590                 BUG_ON(1);
 591         }
 592         nodesize = btrfs_super_nodesize(disk_super);
 593         leafsize = btrfs_super_leafsize(disk_super);
 594         sectorsize = btrfs_super_sectorsize(disk_super);
 595         stripesize = btrfs_super_stripesize(disk_super);
 596         tree_root->nodesize = nodesize;
 597         tree_root->leafsize = leafsize;
 598         tree_root->sectorsize = sectorsize;
 599         tree_root->stripesize = stripesize;
 600
 601         ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
 602         BUG_ON(ret);
 603         ret = btrfs_read_sys_array(tree_root);
 604         BUG_ON(ret);
 605         blocksize = btrfs_level_size(tree_root,
 606                                      btrfs_super_chunk_root_level(disk_super));
 607
 608         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 609                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 610
 611         chunk_root->node = read_tree_block(chunk_root,
 612                                            btrfs_super_chunk_root(disk_super),
 613                                            blocksize, 0);
 614
 615         BUG_ON(!chunk_root->node);
 616
 617         read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
 618                  (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
 619                  BTRFS_UUID_SIZE);
 620
 621         ret = btrfs_read_chunk_tree(chunk_root);
 622         BUG_ON(ret);
 623
 624         blocksize = btrfs_level_size(tree_root,
 625                                      btrfs_super_root_level(disk_super));
 626
 627         tree_root->node = read_tree_block(tree_root,
 628                                           btrfs_super_root(disk_super),
 629                                           blocksize, 0);
 630         BUG_ON(!tree_root->node);
 631         ret = find_and_setup_root(tree_root, fs_info,
 632                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 633         BUG_ON(ret);
 634         extent_root->track_dirty = 1;
 635
 636         ret = find_and_setup_root(tree_root, fs_info,
 637                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 638         BUG_ON(ret);
 639         dev_root->track_dirty = 1;
 640
 641         ret = find_and_setup_root(tree_root, fs_info,
 642                                   BTRFS_FS_TREE_OBJECTID, root);
 643         BUG_ON(ret);
 644         root->ref_cows = 1;
 645         fs_info->generation = btrfs_super_generation(disk_super) + 1;
 646         btrfs_read_block_groups(root);
 647
 648         fs_info->data_alloc_profile = (u64)-1;
 649         fs_info->metadata_alloc_profile = (u64)-1;
 650         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 651
 652         return root;
 653 }
 654
 655 int write_all_supers(struct btrfs_root *root)
 656 {
 657         struct list_head *cur;
 658         struct list_head *head = &root->fs_info->fs_devices->devices;
 659         struct btrfs_device *dev;
 660         struct extent_buffer *sb;
 661         struct btrfs_dev_item *dev_item;
 662         int ret;
 663
 664         sb = root->fs_info->sb_buffer;
 665         dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
 666                                                       dev_item);
 667         list_for_each(cur, head) {
 668                 dev = list_entry(cur, struct btrfs_device, dev_list);
 669                 btrfs_set_device_type(sb, dev_item, dev->type);
 670                 btrfs_set_device_id(sb, dev_item, dev->devid);
 671                 btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
 672                 btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
 673                 btrfs_set_device_io_align(sb, dev_item, dev->io_align);
 674                 btrfs_set_device_io_width(sb, dev_item, dev->io_width);
 675                 btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
 676                 write_extent_buffer(sb, dev->uuid,
 677                                     (unsigned long)btrfs_device_uuid(dev_item),
 678                                     BTRFS_UUID_SIZE);
 679                 sb->fd = dev->fd;
 680                 sb->dev_bytenr = sb->start;
 681                 btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
 682                 csum_tree_block(root, sb, 0);
 683                 ret = write_extent_to_disk(sb);
 684                 BUG_ON(ret);
 685         }
 686         return 0;
 687 }
 688
 689 int write_ctree_super(struct btrfs_trans_handle *trans,
 690                       struct btrfs_root *root)
 691 {
 692         int ret;
 693         struct btrfs_root *tree_root = root->fs_info->tree_root;
 694         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
 695
 696         if (root->fs_info->readonly)
 697                 return 0;
 698
 699         btrfs_set_super_generation(&root->fs_info->super_copy,
 700                                    trans->transid);
 701         btrfs_set_super_root(&root->fs_info->super_copy,
 702                              tree_root->node->start);
 703         btrfs_set_super_root_level(&root->fs_info->super_copy,
 704                                    btrfs_header_level(tree_root->node));
 705         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
 706                                    chunk_root->node->start);
 707         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
 708                                          btrfs_header_level(chunk_root->node));
 709         write_extent_buffer(root->fs_info->sb_buffer,
 710                             &root->fs_info->super_copy, 0,
 711                             sizeof(root->fs_info->super_copy));
 712         ret = write_all_supers(root);
 713         if (ret)
 714                 fprintf(stderr, "failed to write new super block err %d\n", ret);
 715         return ret;
 716 }
 717
 718 static int close_all_devices(struct btrfs_fs_info *fs_info)
 719 {
 720         struct list_head *list;
 721         struct list_head *next;
 722         struct btrfs_device *device;
 723
 724         return 0;
 725
 726         list = &fs_info->fs_devices->devices;
 727         list_for_each(next, list) {
 728                 device = list_entry(next, struct btrfs_device, dev_list);
 729                 close(device->fd);
 730         }
 731         return 0;
 732 }
 733
 734 int close_ctree(struct btrfs_root *root)
 735 {
 736         int ret;
 737         struct btrfs_trans_handle *trans;
 738         struct btrfs_fs_info *fs_info = root->fs_info;
 739
 740         trans = btrfs_start_transaction(root, 1);
 741         btrfs_commit_transaction(trans, root);
 742         trans = btrfs_start_transaction(root, 1);
 743         ret = commit_tree_roots(trans, root->fs_info);
 744         BUG_ON(ret);
 745         ret = __commit_transaction(trans, root);
 746         BUG_ON(ret);
 747         write_ctree_super(trans, root);
 748         btrfs_free_transaction(root, trans);
 749         btrfs_free_block_groups(root->fs_info);
 750         if (root->node)
 751                 free_extent_buffer(root->node);
 752         if (root->fs_info->extent_root->node)
 753                 free_extent_buffer(root->fs_info->extent_root->node);
 754         if (root->fs_info->tree_root->node)
 755                 free_extent_buffer(root->fs_info->tree_root->node);
 756         free_extent_buffer(root->commit_root);
 757         free_extent_buffer(root->fs_info->sb_buffer);
 758
 759         if (root->fs_info->chunk_root->node);
 760                 free_extent_buffer(root->fs_info->chunk_root->node);
 761
 762         if (root->fs_info->dev_root->node);
 763                 free_extent_buffer(root->fs_info->dev_root->node);
 764
 765         close_all_devices(root->fs_info);
 766         extent_io_tree_cleanup(&fs_info->extent_cache);
 767         extent_io_tree_cleanup(&fs_info->free_space_cache);
 768         extent_io_tree_cleanup(&fs_info->block_group_cache);
 769         extent_io_tree_cleanup(&fs_info->pinned_extents);
 770         extent_io_tree_cleanup(&fs_info->pending_del);
 771         extent_io_tree_cleanup(&fs_info->extent_ins);
 772
 773         free(fs_info->tree_root);
 774         free(fs_info->extent_root);
 775         free(fs_info->fs_root);
 776         free(fs_info->chunk_root);
 777         free(fs_info->dev_root);
 778         free(fs_info);
 779
 780         return 0;
 781 }
 782
 783 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 784                      struct extent_buffer *eb)
 785 {
 786         return clear_extent_buffer_dirty(eb);
 787 }
 788
 789 int wait_on_tree_block_writeback(struct btrfs_root *root,
 790                                  struct extent_buffer *eb)
 791 {
 792         return 0;
 793 }
 794
 795 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
 796 {
 797         set_extent_buffer_dirty(eb);
 798 }
 799
 800 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
 801 {
 802         int ret;
 803
 804         ret = extent_buffer_uptodate(buf);
 805         if (!ret)
 806                 return ret;
 807
 808         ret = verify_parent_transid(buf->tree, buf, parent_transid);
 809         return !ret;
 810 }
 811
 812 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
 813 {
 814         return set_extent_buffer_uptodate(eb);
 815 }