disk-io.c

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #define _XOPEN_SOURCE 600
  20 #define __USE_XOPEN2K
  21 #define _GNU_SOURCE 1
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include "kerncompat.h"
  29 #include "radix-tree.h"
  30 #include "ctree.h"
  31 #include "disk-io.h"
  32 #include "volumes.h"
  33 #include "transaction.h"
  34 #include "crc32c.h"
  35 #include "utils.h"
  36 #include "print-tree.h"
  37
  38 static int close_all_devices(struct btrfs_fs_info *fs_info);
  39
  40 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
  41 {
  42
  43         struct btrfs_fs_devices *fs_devices;
  44         int ret = 1;
  45
  46         if (buf->start != btrfs_header_bytenr(buf)) {
  47                 printk("Check tree block failed, want=%Lu, have=%Lu\n",
  48                        buf->start, btrfs_header_bytenr(buf));
  49                 return ret;
  50         }
  51
  52         fs_devices = root->fs_info->fs_devices;
  53         while (fs_devices) {
  54                 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
  55                                           (unsigned long)btrfs_header_fsid(buf),
  56                                           BTRFS_FSID_SIZE)) {
  57                         ret = 0;
  58                         break;
  59                 }
  60                 fs_devices = fs_devices->seed;
  61         }
  62         return ret;
  63 }
  64
  65 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  66 {
  67         return crc32c(seed, data, len);
  68 }
  69
  70 void btrfs_csum_final(u32 crc, char *result)
  71 {
  72         *(__le32 *)result = ~cpu_to_le32(crc);
  73 }
  74
  75 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
  76                          int verify)
  77 {
  78         char *result;
  79         u32 len;
  80         u32 crc = ~(u32)0;
  81
  82         result = malloc(csum_size * sizeof(char));
  83         if (!result)
  84                 return 1;
  85
  86         len = buf->len - BTRFS_CSUM_SIZE;
  87         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  88         btrfs_csum_final(crc, result);
  89
  90         if (verify) {
  91                 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
  92                         printk("checksum verify failed on %llu found %X "
  93                                "wanted %X\n", (unsigned long long)buf->start,
  94                                *((int *)result), *((char *)buf->data));
  95                         free(result);
  96                         return 1;
  97                 }
  98         } else {
  99                 write_extent_buffer(buf, result, 0, csum_size);
 100         }
 101         free(result);
 102         return 0;
 103 }
 104
 105 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 106                     int verify)
 107 {
 108         u16 csum_size =
 109                 btrfs_super_csum_size(&root->fs_info->super_copy);
 110         return csum_tree_block_size(buf, csum_size, verify);
 111 }
 112
 113 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 114                                             u64 bytenr, u32 blocksize)
 115 {
 116         return find_extent_buffer(&root->fs_info->extent_cache,
 117                                   bytenr, blocksize);
 118 }
 119
 120 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 121                                                  u64 bytenr, u32 blocksize)
 122 {
 123         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
 124                                    blocksize);
 125 }
 126
 127 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
 128                          u64 parent_transid)
 129 {
 130         int ret;
 131         struct extent_buffer *eb;
 132         u64 length;
 133         struct btrfs_multi_bio *multi = NULL;
 134         struct btrfs_device *device;
 135
 136         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 137         if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
 138                 free_extent_buffer(eb);
 139                 return 0;
 140         }
 141
 142         length = blocksize;
 143         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 144                               bytenr, &length, &multi, 0, NULL);
 145         BUG_ON(ret);
 146         device = multi->stripes[0].dev;
 147         device->total_ios++;
 148         blocksize = min(blocksize, (u32)(64 * 1024));
 149         readahead(device->fd, multi->stripes[0].physical, blocksize);
 150         kfree(multi);
 151         return 0;
 152 }
 153
 154 static int verify_parent_transid(struct extent_io_tree *io_tree,
 155                                  struct extent_buffer *eb, u64 parent_transid,
 156                                  int ignore)
 157 {
 158         int ret;
 159
 160         if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
 161                 return 0;
 162
 163         if (extent_buffer_uptodate(eb) &&
 164             btrfs_header_generation(eb) == parent_transid) {
 165                 ret = 0;
 166                 goto out;
 167         }
 168         printk("parent transid verify failed on %llu wanted %llu found %llu\n",
 169                (unsigned long long)eb->start,
 170                (unsigned long long)parent_transid,
 171                (unsigned long long)btrfs_header_generation(eb));
 172         if (ignore) {
 173                 printk("Ignoring transid failure\n");
 174                 return 0;
 175         }
 176
 177         ret = 1;
 178 out:
 179         clear_extent_buffer_uptodate(io_tree, eb);
 180         return ret;
 181
 182 }
 183
 184
 185 static int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
 186 {
 187         unsigned long offset = 0;
 188         struct btrfs_multi_bio *multi = NULL;
 189         struct btrfs_device *device;
 190         int ret = 0;
 191         u64 read_len;
 192         unsigned long bytes_left = eb->len;
 193
 194         while (bytes_left) {
 195                 read_len = bytes_left;
 196                 ret = btrfs_map_block(&info->mapping_tree, READ,
 197                                       eb->start + offset, &read_len, &multi,
 198                                       mirror, NULL);
 199                 if (ret) {
 200                         printk("Couldn't map the block %Lu\n", eb->start + offset);
 201                         return -EIO;
 202                 }
 203                 device = multi->stripes[0].dev;
 204
 205                 if (device->fd == 0)
 206                         return -EIO;
 207
 208                 eb->fd = device->fd;
 209                 device->total_ios++;
 210                 eb->dev_bytenr = multi->stripes[0].physical;
 211                 kfree(multi);
 212
 213                 if (read_len > bytes_left)
 214                         read_len = bytes_left;
 215
 216                 ret = read_extent_from_disk(eb, offset, read_len);
 217                 if (ret)
 218                         return -EIO;
 219                 offset += read_len;
 220                 bytes_left -= read_len;
 221         }
 222         return 0;
 223 }
 224
 225 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 226                                      u32 blocksize, u64 parent_transid)
 227 {
 228         int ret;
 229         struct extent_buffer *eb;
 230         u64 best_transid = 0;
 231         int mirror_num = 0;
 232         int good_mirror = 0;
 233         int num_copies;
 234         int ignore = 0;
 235
 236         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 237         if (!eb)
 238                 return NULL;
 239
 240         if (btrfs_buffer_uptodate(eb, parent_transid))
 241                 return eb;
 242
 243         while (1) {
 244                 ret = read_whole_eb(root->fs_info, eb, mirror_num);
 245                 if (ret == 0 && check_tree_block(root, eb) == 0 &&
 246                     csum_tree_block(root, eb, 1) == 0 &&
 247                     verify_parent_transid(eb->tree, eb, parent_transid, ignore)
 248                     == 0) {
 249                         btrfs_set_buffer_uptodate(eb);
 250                         return eb;
 251                 }
 252                 if (ignore) {
 253                         if (check_tree_block(root, eb))
 254                                 printk("read block failed check_tree_block\n");
 255                         else
 256                                 printk("Csum didn't match\n");
 257                         break;
 258                 }
 259                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 260                                               eb->start, eb->len);
 261                 if (num_copies == 1) {
 262                         ignore = 1;
 263                         continue;
 264                 }
 265                 if (btrfs_header_generation(eb) > best_transid) {
 266                         best_transid = btrfs_header_generation(eb);
 267                         good_mirror = mirror_num;
 268                 }
 269                 mirror_num++;
 270                 if (mirror_num > num_copies) {
 271                         mirror_num = good_mirror;
 272                         ignore = 1;
 273                         continue;
 274                 }
 275         }
 276         free_extent_buffer(eb);
 277         return NULL;
 278 }
 279
 280 static int rmw_eb(struct btrfs_fs_info *info,
 281                   struct extent_buffer *eb, struct extent_buffer *orig_eb)
 282 {
 283         int ret;
 284         unsigned long orig_off = 0;
 285         unsigned long dest_off = 0;
 286         unsigned long copy_len = eb->len;
 287
 288         ret = read_whole_eb(info, eb, 0);
 289         if (ret)
 290                 return ret;
 291
 292         if (eb->start + eb->len <= orig_eb->start ||
 293             eb->start >= orig_eb->start + orig_eb->len)
 294                 return 0;
 295         /*
 296          * | ----- orig_eb ------- |
 297          *         | ----- stripe -------  |
 298          *         | ----- orig_eb ------- |
 299          *              | ----- orig_eb ------- |
 300          */
 301         if (eb->start > orig_eb->start)
 302                 orig_off = eb->start - orig_eb->start;
 303         if (orig_eb->start > eb->start)
 304                 dest_off = orig_eb->start - eb->start;
 305
 306         if (copy_len > orig_eb->len - orig_off)
 307                 copy_len = orig_eb->len - orig_off;
 308         if (copy_len > eb->len - dest_off)
 309                 copy_len = eb->len - dest_off;
 310
 311         memcpy(eb->data + dest_off, orig_eb->data + orig_off, copy_len);
 312         return 0;
 313 }
 314
 315 static void split_eb_for_raid56(struct btrfs_fs_info *info,
 316                                 struct extent_buffer *orig_eb,
 317                                struct extent_buffer **ebs,
 318                                u64 stripe_len, u64 *raid_map,
 319                                int num_stripes)
 320 {
 321         struct extent_buffer *eb;
 322         u64 start = orig_eb->start;
 323         u64 this_eb_start;
 324         int i;
 325         int ret;
 326
 327         for (i = 0; i < num_stripes; i++) {
 328                 if (raid_map[i] >= BTRFS_RAID5_P_STRIPE)
 329                         break;
 330
 331                 eb = malloc(sizeof(struct extent_buffer) + stripe_len);
 332                 if (!eb)
 333                         BUG();
 334                 memset(eb, 0, sizeof(struct extent_buffer) + stripe_len);
 335
 336                 eb->start = raid_map[i];
 337                 eb->len = stripe_len;
 338                 eb->refs = 1;
 339                 eb->flags = 0;
 340                 eb->fd = -1;
 341                 eb->dev_bytenr = (u64)-1;
 342
 343                 this_eb_start = raid_map[i];
 344
 345                 if (start > this_eb_start ||
 346                     start + orig_eb->len < this_eb_start + stripe_len) {
 347                         ret = rmw_eb(info, eb, orig_eb);
 348                         BUG_ON(ret);
 349                 } else {
 350                         memcpy(eb->data, orig_eb->data + eb->start - start, stripe_len);
 351                 }
 352                 ebs[i] = eb;
 353         }
 354 }
 355
 356 static int write_raid56_with_parity(struct btrfs_fs_info *info,
 357                                     struct extent_buffer *eb,
 358                                     struct btrfs_multi_bio *multi,
 359                                     u64 stripe_len, u64 *raid_map)
 360 {
 361         struct extent_buffer *ebs[multi->num_stripes], *p_eb = NULL, *q_eb = NULL;
 362         int i;
 363         int j;
 364         int ret;
 365         int alloc_size = eb->len;
 366
 367         if (stripe_len > alloc_size)
 368                 alloc_size = stripe_len;
 369
 370         split_eb_for_raid56(info, eb, ebs, stripe_len, raid_map,
 371                             multi->num_stripes);
 372
 373         for (i = 0; i < multi->num_stripes; i++) {
 374                 struct extent_buffer *new_eb;
 375                 if (raid_map[i] < BTRFS_RAID5_P_STRIPE) {
 376                         ebs[i]->dev_bytenr = multi->stripes[i].physical;
 377                         ebs[i]->fd = multi->stripes[i].dev->fd;
 378                         multi->stripes[i].dev->total_ios++;
 379                         BUG_ON(ebs[i]->start != raid_map[i]);
 380                         continue;
 381                 }
 382                 new_eb = kmalloc(sizeof(*eb) + alloc_size, GFP_NOFS);
 383                 BUG_ON(!new_eb);
 384                 new_eb->dev_bytenr = multi->stripes[i].physical;
 385                 new_eb->fd = multi->stripes[i].dev->fd;
 386                 multi->stripes[i].dev->total_ios++;
 387                 new_eb->len = stripe_len;
 388
 389                 if (raid_map[i] == BTRFS_RAID5_P_STRIPE)
 390                         p_eb = new_eb;
 391                 else if (raid_map[i] == BTRFS_RAID6_Q_STRIPE)
 392                         q_eb = new_eb;
 393         }
 394         if (q_eb) {
 395                 void *pointers[multi->num_stripes];
 396                 ebs[multi->num_stripes - 2] = p_eb;
 397                 ebs[multi->num_stripes - 1] = q_eb;
 398
 399                 for (i = 0; i < multi->num_stripes; i++)
 400                         pointers[i] = ebs[i]->data;
 401
 402                 raid6_gen_syndrome(multi->num_stripes, stripe_len, pointers);
 403         } else {
 404                 ebs[multi->num_stripes - 1] = p_eb;
 405                 memcpy(p_eb->data, ebs[0]->data, stripe_len);
 406                 for (j = 1; j < multi->num_stripes - 1; j++) {
 407                         for (i = 0; i < stripe_len; i += sizeof(unsigned long)) {
 408                                 *(unsigned long *)(p_eb->data + i) ^=
 409                                         *(unsigned long *)(ebs[j]->data + i);
 410                         }
 411                 }
 412         }
 413
 414         for (i = 0; i < multi->num_stripes; i++) {
 415                 ret = write_extent_to_disk(ebs[i]);
 416                 BUG_ON(ret);
 417                 if (ebs[i] != eb)
 418                         kfree(ebs[i]);
 419         }
 420         return 0;
 421 }
 422
 423 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 424                      struct extent_buffer *eb)
 425 {
 426         int ret;
 427         int dev_nr;
 428         u64 length;
 429         u64 *raid_map = NULL;
 430         struct btrfs_multi_bio *multi = NULL;
 431
 432         if (check_tree_block(root, eb))
 433                 BUG();
 434         if (!btrfs_buffer_uptodate(eb, trans->transid))
 435                 BUG();
 436
 437         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 438         csum_tree_block(root, eb, 0);
 439
 440         dev_nr = 0;
 441         length = eb->len;
 442         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 443                               eb->start, &length, &multi, 0, &raid_map);
 444
 445         if (raid_map) {
 446                 ret = write_raid56_with_parity(root->fs_info, eb, multi,
 447                                                length, raid_map);
 448                 BUG_ON(ret);
 449         } else while (dev_nr < multi->num_stripes) {
 450                 BUG_ON(ret);
 451                 eb->fd = multi->stripes[dev_nr].dev->fd;
 452                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 453                 multi->stripes[dev_nr].dev->total_ios++;
 454                 dev_nr++;
 455                 ret = write_extent_to_disk(eb);
 456                 BUG_ON(ret);
 457         }
 458         kfree(multi);
 459         return 0;
 460 }
 461
 462 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 463                         u32 stripesize, struct btrfs_root *root,
 464                         struct btrfs_fs_info *fs_info, u64 objectid)
 465 {
 466         root->node = NULL;
 467         root->commit_root = NULL;
 468         root->sectorsize = sectorsize;
 469         root->nodesize = nodesize;
 470         root->leafsize = leafsize;
 471         root->stripesize = stripesize;
 472         root->ref_cows = 0;
 473         root->track_dirty = 0;
 474
 475         root->fs_info = fs_info;
 476         root->objectid = objectid;
 477         root->last_trans = 0;
 478         root->highest_inode = 0;
 479         root->last_inode_alloc = 0;
 480
 481         INIT_LIST_HEAD(&root->dirty_list);
 482         memset(&root->root_key, 0, sizeof(root->root_key));
 483         memset(&root->root_item, 0, sizeof(root->root_item));
 484         root->root_key.objectid = objectid;
 485         return 0;
 486 }
 487
 488 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 489                                struct btrfs_root *root)
 490 {
 491         int ret;
 492         u64 old_root_bytenr;
 493         struct btrfs_root *tree_root = root->fs_info->tree_root;
 494
 495         btrfs_write_dirty_block_groups(trans, root);
 496         while(1) {
 497                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 498                 if (old_root_bytenr == root->node->start)
 499                         break;
 500                 btrfs_set_root_bytenr(&root->root_item,
 501                                        root->node->start);
 502                 btrfs_set_root_generation(&root->root_item,
 503                                           trans->transid);
 504                 root->root_item.level = btrfs_header_level(root->node);
 505                 ret = btrfs_update_root(trans, tree_root,
 506                                         &root->root_key,
 507                                         &root->root_item);
 508                 BUG_ON(ret);
 509                 btrfs_write_dirty_block_groups(trans, root);
 510         }
 511         return 0;
 512 }
 513
 514 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 515                              struct btrfs_fs_info *fs_info)
 516 {
 517         struct btrfs_root *root;
 518         struct list_head *next;
 519         struct extent_buffer *eb;
 520         int ret;
 521
 522         if (fs_info->readonly)
 523                 return 0;
 524
 525         eb = fs_info->tree_root->node;
 526         extent_buffer_get(eb);
 527         ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 528         free_extent_buffer(eb);
 529         if (ret)
 530                 return ret;
 531
 532         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 533                 next = fs_info->dirty_cowonly_roots.next;
 534                 list_del_init(next);
 535                 root = list_entry(next, struct btrfs_root, dirty_list);
 536                 update_cowonly_root(trans, root);
 537         }
 538         return 0;
 539 }
 540
 541 static int __commit_transaction(struct btrfs_trans_handle *trans,
 542                                 struct btrfs_root *root)
 543 {
 544         u64 start;
 545         u64 end;
 546         struct extent_buffer *eb;
 547         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 548         int ret;
 549
 550         while(1) {
 551                 ret = find_first_extent_bit(tree, 0, &start, &end,
 552                                             EXTENT_DIRTY);
 553                 if (ret)
 554                         break;
 555                 while(start <= end) {
 556                         eb = find_first_extent_buffer(tree, start);
 557                         BUG_ON(!eb || eb->start != start);
 558                         ret = write_tree_block(trans, root, eb);
 559                         BUG_ON(ret);
 560                         start += eb->len;
 561                         clear_extent_buffer_dirty(eb);
 562                         free_extent_buffer(eb);
 563                 }
 564         }
 565         return 0;
 566 }
 567
 568 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 569                              struct btrfs_root *root)
 570 {
 571         u64 transid = trans->transid;
 572         int ret = 0;
 573         struct btrfs_fs_info *fs_info = root->fs_info;
 574
 575         if (root->commit_root == root->node)
 576                 goto commit_tree;
 577
 578         free_extent_buffer(root->commit_root);
 579         root->commit_root = NULL;
 580
 581         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 582         btrfs_set_root_generation(&root->root_item, trans->transid);
 583         root->root_item.level = btrfs_header_level(root->node);
 584         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 585                                 &root->root_key, &root->root_item);
 586         BUG_ON(ret);
 587 commit_tree:
 588         ret = commit_tree_roots(trans, fs_info);
 589         BUG_ON(ret);
 590         ret = __commit_transaction(trans, root);
 591         BUG_ON(ret);
 592         write_ctree_super(trans, root);
 593         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 594                                    &fs_info->pinned_extents);
 595         btrfs_free_transaction(root, trans);
 596         free_extent_buffer(root->commit_root);
 597         root->commit_root = NULL;
 598         fs_info->running_transaction = NULL;
 599         fs_info->last_trans_committed = transid;
 600         return 0;
 601 }
 602
 603 static int find_and_setup_root(struct btrfs_root *tree_root,
 604                                struct btrfs_fs_info *fs_info,
 605                                u64 objectid, struct btrfs_root *root)
 606 {
 607         int ret;
 608         u32 blocksize;
 609         u64 generation;
 610
 611         __setup_root(tree_root->nodesize, tree_root->leafsize,
 612                      tree_root->sectorsize, tree_root->stripesize,
 613                      root, fs_info, objectid);
 614         ret = btrfs_find_last_root(tree_root, objectid,
 615                                    &root->root_item, &root->root_key);
 616         BUG_ON(ret);
 617
 618         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 619         generation = btrfs_root_generation(&root->root_item);
 620         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 621                                      blocksize, generation);
 622         if (!extent_buffer_uptodate(root->node))
 623                 return -EIO;
 624
 625         return 0;
 626 }
 627
 628 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 629                                struct btrfs_fs_info *fs_info,
 630                                struct btrfs_super_block *disk_super)
 631 {
 632         u32 blocksize;
 633         u64 blocknr = btrfs_super_log_root(disk_super);
 634         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 635
 636         if (!log_root)
 637                 return -ENOMEM;
 638
 639         if (blocknr == 0) {
 640                 free(log_root);
 641                 return 0;
 642         }
 643
 644         blocksize = btrfs_level_size(tree_root,
 645                              btrfs_super_log_root_level(disk_super));
 646
 647         __setup_root(tree_root->nodesize, tree_root->leafsize,
 648                      tree_root->sectorsize, tree_root->stripesize,
 649                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 650
 651         log_root->node = read_tree_block(tree_root, blocknr,
 652                                      blocksize,
 653                                      btrfs_super_generation(disk_super) + 1);
 654
 655         fs_info->log_root_tree = log_root;
 656
 657         if (!extent_buffer_uptodate(log_root->node)) {
 658                 free(log_root);
 659                 return -EIO;
 660         }
 661
 662         free(log_root);
 663         return 0;
 664 }
 665
 666
 667 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info,
 668                        struct btrfs_root *root)
 669 {
 670         if (root->node)
 671                 free_extent_buffer(root->node);
 672         if (root->commit_root)
 673                 free_extent_buffer(root->commit_root);
 674         kfree(root);
 675         return 0;
 676 }
 677
 678 static int free_fs_roots(struct btrfs_fs_info *fs_info)
 679 {
 680         struct cache_extent *cache;
 681         struct btrfs_root *root;
 682
 683         while (1) {
 684                 cache = find_first_cache_extent(&fs_info->fs_root_cache, 0);
 685                 if (!cache)
 686                         break;
 687                 root = container_of(cache, struct btrfs_root, cache);
 688                 remove_cache_extent(&fs_info->fs_root_cache, cache);
 689                 btrfs_free_fs_root(fs_info, root);
 690         }
 691         return 0;
 692 }
 693
 694 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 695                                                struct btrfs_key *location)
 696 {
 697         struct btrfs_root *root;
 698         struct btrfs_root *tree_root = fs_info->tree_root;
 699         struct btrfs_path *path;
 700         struct extent_buffer *l;
 701         u64 generation;
 702         u32 blocksize;
 703         int ret = 0;
 704
 705         root = malloc(sizeof(*root));
 706         if (!root)
 707                 return ERR_PTR(-ENOMEM);
 708         memset(root, 0, sizeof(*root));
 709         if (location->offset == (u64)-1) {
 710                 ret = find_and_setup_root(tree_root, fs_info,
 711                                           location->objectid, root);
 712                 if (ret) {
 713                         free(root);
 714                         return ERR_PTR(ret);
 715                 }
 716                 goto insert;
 717         }
 718
 719         __setup_root(tree_root->nodesize, tree_root->leafsize,
 720                      tree_root->sectorsize, tree_root->stripesize,
 721                      root, fs_info, location->objectid);
 722
 723         path = btrfs_alloc_path();
 724         BUG_ON(!path);
 725         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 726         if (ret != 0) {
 727                 if (ret > 0)
 728                         ret = -ENOENT;
 729                 goto out;
 730         }
 731         l = path->nodes[0];
 732         read_extent_buffer(l, &root->root_item,
 733                btrfs_item_ptr_offset(l, path->slots[0]),
 734                sizeof(root->root_item));
 735         memcpy(&root->root_key, location, sizeof(*location));
 736         ret = 0;
 737 out:
 738         btrfs_release_path(root, path);
 739         btrfs_free_path(path);
 740         if (ret) {
 741                 free(root);
 742                 return ERR_PTR(ret);
 743         }
 744         generation = btrfs_root_generation(&root->root_item);
 745         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 746         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 747                                      blocksize, generation);
 748         BUG_ON(!root->node);
 749 insert:
 750         root->ref_cows = 1;
 751         return root;
 752 }
 753
 754 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 755                                       struct btrfs_key *location)
 756 {
 757         struct btrfs_root *root;
 758         struct cache_extent *cache;
 759         int ret;
 760
 761         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 762                 return fs_info->tree_root;
 763         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 764                 return fs_info->extent_root;
 765         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 766                 return fs_info->chunk_root;
 767         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 768                 return fs_info->dev_root;
 769         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 770                 return fs_info->csum_root;
 771
 772         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 773                location->offset != (u64)-1);
 774
 775         cache = find_cache_extent(&fs_info->fs_root_cache,
 776                                   location->objectid, 1);
 777         if (cache)
 778                 return container_of(cache, struct btrfs_root, cache);
 779
 780         root = btrfs_read_fs_root_no_cache(fs_info, location);
 781         if (IS_ERR(root))
 782                 return root;
 783
 784         root->cache.start = location->objectid;
 785         root->cache.size = 1;
 786         ret = insert_existing_cache_extent(&fs_info->fs_root_cache,
 787                                            &root->cache);
 788         BUG_ON(ret);
 789         return root;
 790 }
 791
 792 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
 793                                              u64 sb_bytenr,
 794                                              u64 root_tree_bytenr, int writes,
 795                                              int partial)
 796 {
 797         u32 sectorsize;
 798         u32 nodesize;
 799         u32 leafsize;
 800         u32 blocksize;
 801         u32 stripesize;
 802         u64 generation;
 803         struct btrfs_key key;
 804         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 805         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 806         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 807         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 808         struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
 809         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 810         int ret;
 811         struct btrfs_super_block *disk_super;
 812         struct btrfs_fs_devices *fs_devices = NULL;
 813         u64 total_devs;
 814         u64 features;
 815
 816         if (sb_bytenr == 0)
 817                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 818
 819         /* try to drop all the caches */
 820         posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED);
 821
 822         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 823                                     &total_devs, sb_bytenr);
 824
 825         if (ret) {
 826                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 827                 goto out;
 828         }
 829
 830         if (total_devs != 1) {
 831                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 832                 if (ret)
 833                         goto out;
 834         }
 835
 836         memset(fs_info, 0, sizeof(*fs_info));
 837         fs_info->tree_root = tree_root;
 838         fs_info->extent_root = extent_root;
 839         fs_info->chunk_root = chunk_root;
 840         fs_info->dev_root = dev_root;
 841         fs_info->csum_root = csum_root;
 842
 843         if (!writes)
 844                 fs_info->readonly = 1;
 845
 846         extent_io_tree_init(&fs_info->extent_cache);
 847         extent_io_tree_init(&fs_info->free_space_cache);
 848         extent_io_tree_init(&fs_info->block_group_cache);
 849         extent_io_tree_init(&fs_info->pinned_extents);
 850         extent_io_tree_init(&fs_info->pending_del);
 851         extent_io_tree_init(&fs_info->extent_ins);
 852         cache_tree_init(&fs_info->fs_root_cache);
 853
 854         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 855
 856         mutex_init(&fs_info->fs_mutex);
 857         fs_info->fs_devices = fs_devices;
 858         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 859         INIT_LIST_HEAD(&fs_info->space_info);
 860
 861         __setup_root(4096, 4096, 4096, 4096, tree_root,
 862                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 863
 864         if (writes)
 865                 ret = btrfs_open_devices(fs_devices, O_RDWR);
 866         else
 867                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
 868         if (ret)
 869                 goto out_cleanup;
 870
 871         fs_info->super_bytenr = sb_bytenr;
 872         disk_super = &fs_info->super_copy;
 873         ret = btrfs_read_dev_super(fs_devices->latest_bdev,
 874                                    disk_super, sb_bytenr);
 875         if (ret) {
 876                 printk("No valid btrfs found\n");
 877                 goto out_devices;
 878         }
 879
 880         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
 881
 882
 883         features = btrfs_super_incompat_flags(disk_super) &
 884                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 885         if (features) {
 886                 printk("couldn't open because of unsupported "
 887                        "option features (%Lx).\n",
 888                        (unsigned long long)features);
 889                 goto out_devices;
 890         }
 891
 892         features = btrfs_super_incompat_flags(disk_super);
 893         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 894                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 895                 btrfs_set_super_incompat_flags(disk_super, features);
 896         }
 897
 898         features = btrfs_super_compat_ro_flags(disk_super) &
 899                 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
 900         if (writes && features) {
 901                 printk("couldn't open RDWR because of unsupported "
 902                        "option features (%Lx).\n",
 903                        (unsigned long long)features);
 904                 goto out_devices;
 905         }
 906
 907         nodesize = btrfs_super_nodesize(disk_super);
 908         leafsize = btrfs_super_leafsize(disk_super);
 909         sectorsize = btrfs_super_sectorsize(disk_super);
 910         stripesize = btrfs_super_stripesize(disk_super);
 911         tree_root->nodesize = nodesize;
 912         tree_root->leafsize = leafsize;
 913         tree_root->sectorsize = sectorsize;
 914         tree_root->stripesize = stripesize;
 915
 916         ret = btrfs_read_sys_array(tree_root);
 917         if (ret)
 918                 goto out_devices;
 919         blocksize = btrfs_level_size(tree_root,
 920                                      btrfs_super_chunk_root_level(disk_super));
 921         generation = btrfs_super_chunk_root_generation(disk_super);
 922
 923         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 924                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 925
 926         chunk_root->node = read_tree_block(chunk_root,
 927                                            btrfs_super_chunk_root(disk_super),
 928                                            blocksize, generation);
 929         if (!extent_buffer_uptodate(chunk_root->node)) {
 930                 printk("Couldn't read chunk root\n");
 931                 goto out_devices;
 932         }
 933
 934         read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
 935                  (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
 936                  BTRFS_UUID_SIZE);
 937
 938         if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
 939                 ret = btrfs_read_chunk_tree(chunk_root);
 940                 if (ret)
 941                         goto out_failed;
 942         }
 943
 944         blocksize = btrfs_level_size(tree_root,
 945                                      btrfs_super_root_level(disk_super));
 946         generation = btrfs_super_generation(disk_super);
 947
 948         if (!root_tree_bytenr)
 949                 root_tree_bytenr = btrfs_super_root(disk_super);
 950         tree_root->node = read_tree_block(tree_root,
 951                                           root_tree_bytenr,
 952                                           blocksize, generation);
 953         if (!extent_buffer_uptodate(tree_root->node)) {
 954                 printk("Couldn't read tree root\n");
 955                 goto out_failed;
 956         }
 957         ret = find_and_setup_root(tree_root, fs_info,
 958                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 959         if (ret) {
 960                 printk("Couldn't setup extent tree\n");
 961                 goto out_failed;
 962         }
 963         extent_root->track_dirty = 1;
 964
 965         ret = find_and_setup_root(tree_root, fs_info,
 966                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 967         if (ret) {
 968                 printk("Couldn't setup device tree\n");
 969                 goto out_failed;
 970         }
 971         dev_root->track_dirty = 1;
 972
 973         ret = find_and_setup_root(tree_root, fs_info,
 974                                   BTRFS_CSUM_TREE_OBJECTID, csum_root);
 975         if (ret) {
 976                 printk("Couldn't setup csum tree\n");
 977                 if (!partial)
 978                         goto out_failed;
 979         }
 980         csum_root->track_dirty = 1;
 981
 982         find_and_setup_log_root(tree_root, fs_info, disk_super);
 983
 984         fs_info->generation = generation;
 985         fs_info->last_trans_committed = generation;
 986         btrfs_read_block_groups(fs_info->tree_root);
 987
 988         key.objectid = BTRFS_FS_TREE_OBJECTID;
 989         key.type = BTRFS_ROOT_ITEM_KEY;
 990         key.offset = (u64)-1;
 991         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
 992
 993         if (!fs_info->fs_root)
 994                 goto out_failed;
 995
 996         fs_info->data_alloc_profile = (u64)-1;
 997         fs_info->metadata_alloc_profile = (u64)-1;
 998         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 999
1000         return fs_info;
1001
1002 out_failed:
1003         if (partial)
1004                 return fs_info;
1005
1006         if (fs_info->csum_root)
1007                 free_extent_buffer(fs_info->csum_root->node);
1008         if (fs_info->dev_root)
1009                 free_extent_buffer(fs_info->dev_root->node);
1010         if (fs_info->extent_root)
1011                 free_extent_buffer(fs_info->extent_root->node);
1012         if (fs_info->tree_root)
1013                 free_extent_buffer(fs_info->tree_root->node);
1014         if (fs_info->chunk_root)
1015                 free_extent_buffer(fs_info->chunk_root->node);
1016 out_devices:
1017         close_all_devices(fs_info);
1018 out_cleanup:
1019         extent_io_tree_cleanup(&fs_info->extent_cache);
1020         extent_io_tree_cleanup(&fs_info->free_space_cache);
1021         extent_io_tree_cleanup(&fs_info->block_group_cache);
1022         extent_io_tree_cleanup(&fs_info->pinned_extents);
1023         extent_io_tree_cleanup(&fs_info->pending_del);
1024         extent_io_tree_cleanup(&fs_info->extent_ins);
1025 out:
1026         free(tree_root);
1027         free(extent_root);
1028         free(chunk_root);
1029         free(dev_root);
1030         free(csum_root);
1031         free(fs_info);
1032         return NULL;
1033 }
1034
1035 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1036                                          u64 sb_bytenr, int writes,
1037                                          int partial)
1038 {
1039         int fp;
1040         struct btrfs_fs_info *info;
1041         int flags = O_CREAT | O_RDWR;
1042
1043         if (!writes)
1044                 flags = O_RDONLY;
1045
1046         fp = open(filename, flags, 0600);
1047         if (fp < 0) {
1048                 fprintf (stderr, "Could not open %s\n", filename);
1049                 return NULL;
1050         }
1051         info = __open_ctree_fd(fp, filename, sb_bytenr, 0, writes, partial);
1052         close(fp);
1053         return info;
1054 }
1055
1056 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
1057 {
1058         struct btrfs_fs_info *info;
1059
1060         info = open_ctree_fs_info(filename, sb_bytenr, writes, 0);
1061         if (!info)
1062                 return NULL;
1063         return info->fs_root;
1064 }
1065
1066 struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
1067                                        u64 root_tree_bytenr)
1068 {
1069         int fp;
1070         struct btrfs_fs_info *info;
1071
1072
1073         fp = open(filename, O_RDONLY);
1074         if (fp < 0) {
1075                 fprintf (stderr, "Could not open %s\n", filename);
1076                 return NULL;
1077         }
1078         info = __open_ctree_fd(fp, filename, sb_bytenr,
1079                                root_tree_bytenr, 0, 0);
1080         close(fp);
1081
1082         if (!info)
1083                 return NULL;
1084         return info->fs_root;
1085 }
1086
1087 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1088                                  int writes)
1089 {
1090         struct btrfs_fs_info *info;
1091         info = __open_ctree_fd(fp, path, sb_bytenr, 0, writes, 0);
1092         if (!info)
1093                 return NULL;
1094         return info->fs_root;
1095 }
1096
1097 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
1098 {
1099         u8 fsid[BTRFS_FSID_SIZE];
1100         int fsid_is_initialized = 0;
1101         struct btrfs_super_block buf;
1102         int i;
1103         int ret;
1104         u64 transid = 0;
1105         u64 bytenr;
1106
1107         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1108                 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
1109                 if (ret < sizeof(buf))
1110                         return -1;
1111
1112                 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
1113                     buf.magic != cpu_to_le64(BTRFS_MAGIC))
1114                         return -1;
1115
1116                 memcpy(sb, &buf, sizeof(*sb));
1117                 return 0;
1118         }
1119
1120         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1121                 bytenr = btrfs_sb_offset(i);
1122                 ret = pread64(fd, &buf, sizeof(buf), bytenr);
1123                 if (ret < sizeof(buf))
1124                         break;
1125
1126                 if (btrfs_super_bytenr(&buf) != bytenr )
1127                         continue;
1128                 /* if magic is NULL, the device was removed */
1129                 if (buf.magic == 0 && i == 0)
1130                         return -1;
1131                 if (buf.magic != cpu_to_le64(BTRFS_MAGIC))
1132                         continue;
1133
1134                 if (!fsid_is_initialized) {
1135                         memcpy(fsid, buf.fsid, sizeof(fsid));
1136                         fsid_is_initialized = 1;
1137                 } else if (memcmp(fsid, buf.fsid, sizeof(fsid))) {
1138                         /*
1139                          * the superblocks (the original one and
1140                          * its backups) contain data of different
1141                          * filesystems -> the super cannot be trusted
1142                          */
1143                         continue;
1144                 }
1145
1146                 if (btrfs_super_generation(&buf) > transid) {
1147                         memcpy(sb, &buf, sizeof(*sb));
1148                         transid = btrfs_super_generation(&buf);
1149                 }
1150         }
1151
1152         return transid > 0 ? 0 : -1;
1153 }
1154
1155 int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
1156                      struct btrfs_device *device)
1157 {
1158         u64 bytenr;
1159         u32 crc;
1160         int i, ret;
1161         void *buf;
1162
1163         buf = calloc(1, BTRFS_SUPER_INFO_SIZE);
1164         BUG_ON(!buf);
1165
1166         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1167                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1168                 crc = ~(u32)0;
1169                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1170                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1171                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1172
1173                 memcpy(buf, sb, sizeof(*sb));
1174                 ret = pwrite64(device->fd, buf, BTRFS_SUPER_INFO_SIZE,
1175                                root->fs_info->super_bytenr);
1176                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1177                 goto out;
1178         }
1179
1180         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1181                 bytenr = btrfs_sb_offset(i);
1182                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1183                         break;
1184
1185                 btrfs_set_super_bytenr(sb, bytenr);
1186
1187                 crc = ~(u32)0;
1188                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1189                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1190                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1191
1192                 memcpy(buf, sb, sizeof(*sb));
1193                 ret = pwrite64(device->fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1194                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1195         }
1196 out:
1197         free(buf);
1198         return 0;
1199 }
1200
1201 int write_all_supers(struct btrfs_root *root)
1202 {
1203         struct list_head *cur;
1204         struct list_head *head = &root->fs_info->fs_devices->devices;
1205         struct btrfs_device *dev;
1206         struct btrfs_super_block *sb;
1207         struct btrfs_dev_item *dev_item;
1208         int ret;
1209         u64 flags;
1210
1211         sb = &root->fs_info->super_copy;
1212         dev_item = &sb->dev_item;
1213         list_for_each(cur, head) {
1214                 dev = list_entry(cur, struct btrfs_device, dev_list);
1215                 if (!dev->writeable)
1216                         continue;
1217
1218                 btrfs_set_stack_device_generation(dev_item, 0);
1219                 btrfs_set_stack_device_type(dev_item, dev->type);
1220                 btrfs_set_stack_device_id(dev_item, dev->devid);
1221                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1222                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1223                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1224                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1225                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1226                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1227                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1228
1229                 flags = btrfs_super_flags(sb);
1230                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1231
1232                 ret = write_dev_supers(root, sb, dev);
1233                 BUG_ON(ret);
1234         }
1235         return 0;
1236 }
1237
1238 int write_ctree_super(struct btrfs_trans_handle *trans,
1239                       struct btrfs_root *root)
1240 {
1241         int ret;
1242         struct btrfs_root *tree_root = root->fs_info->tree_root;
1243         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1244
1245         if (root->fs_info->readonly)
1246                 return 0;
1247
1248         btrfs_set_super_generation(&root->fs_info->super_copy,
1249                                    trans->transid);
1250         btrfs_set_super_root(&root->fs_info->super_copy,
1251                              tree_root->node->start);
1252         btrfs_set_super_root_level(&root->fs_info->super_copy,
1253                                    btrfs_header_level(tree_root->node));
1254         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
1255                                    chunk_root->node->start);
1256         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
1257                                          btrfs_header_level(chunk_root->node));
1258         btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
1259                                 btrfs_header_generation(chunk_root->node));
1260
1261         ret = write_all_supers(root);
1262         if (ret)
1263                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1264         return ret;
1265 }
1266
1267 static int close_all_devices(struct btrfs_fs_info *fs_info)
1268 {
1269         struct list_head *list;
1270         struct list_head *next;
1271         struct btrfs_device *device;
1272
1273         return 0;
1274
1275         list = &fs_info->fs_devices->devices;
1276         list_for_each(next, list) {
1277                 device = list_entry(next, struct btrfs_device, dev_list);
1278                 if (device->fd) {
1279                         fsync(device->fd);
1280                         posix_fadvise(device->fd, 0, 0, POSIX_FADV_DONTNEED);
1281                 }
1282                 close(device->fd);
1283         }
1284         return 0;
1285 }
1286
1287 int close_ctree(struct btrfs_root *root)
1288 {
1289         int ret;
1290         struct btrfs_trans_handle *trans;
1291         struct btrfs_fs_info *fs_info = root->fs_info;
1292
1293         if (fs_info->last_trans_committed !=
1294             fs_info->generation) {
1295                 trans = btrfs_start_transaction(root, 1);
1296                 btrfs_commit_transaction(trans, root);
1297                 trans = btrfs_start_transaction(root, 1);
1298                 ret = commit_tree_roots(trans, fs_info);
1299                 BUG_ON(ret);
1300                 ret = __commit_transaction(trans, root);
1301                 BUG_ON(ret);
1302                 write_ctree_super(trans, root);
1303                 btrfs_free_transaction(root, trans);
1304         }
1305         btrfs_free_block_groups(fs_info);
1306
1307         free_fs_roots(fs_info);
1308
1309         if (fs_info->extent_root->node)
1310                 free_extent_buffer(fs_info->extent_root->node);
1311         if (fs_info->tree_root->node)
1312                 free_extent_buffer(fs_info->tree_root->node);
1313         if (fs_info->chunk_root->node)
1314                 free_extent_buffer(fs_info->chunk_root->node);
1315         if (fs_info->dev_root->node)
1316                 free_extent_buffer(fs_info->dev_root->node);
1317         if (fs_info->csum_root->node)
1318                 free_extent_buffer(fs_info->csum_root->node);
1319
1320         if (fs_info->log_root_tree) {
1321                 if (fs_info->log_root_tree->node)
1322                         free_extent_buffer(fs_info->log_root_tree->node);
1323                 free(fs_info->log_root_tree);
1324         }
1325
1326         close_all_devices(fs_info);
1327         extent_io_tree_cleanup(&fs_info->extent_cache);
1328         extent_io_tree_cleanup(&fs_info->free_space_cache);
1329         extent_io_tree_cleanup(&fs_info->block_group_cache);
1330         extent_io_tree_cleanup(&fs_info->pinned_extents);
1331         extent_io_tree_cleanup(&fs_info->pending_del);
1332         extent_io_tree_cleanup(&fs_info->extent_ins);
1333
1334         free(fs_info->tree_root);
1335         free(fs_info->extent_root);
1336         free(fs_info->chunk_root);
1337         free(fs_info->dev_root);
1338         free(fs_info->csum_root);
1339         free(fs_info);
1340
1341         return 0;
1342 }
1343
1344 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1345                      struct extent_buffer *eb)
1346 {
1347         return clear_extent_buffer_dirty(eb);
1348 }
1349
1350 int wait_on_tree_block_writeback(struct btrfs_root *root,
1351                                  struct extent_buffer *eb)
1352 {
1353         return 0;
1354 }
1355
1356 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1357 {
1358         set_extent_buffer_dirty(eb);
1359 }
1360
1361 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1362 {
1363         int ret;
1364
1365         ret = extent_buffer_uptodate(buf);
1366         if (!ret)
1367                 return ret;
1368
1369         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1370         return !ret;
1371 }
1372
1373 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1374 {
1375         return set_extent_buffer_uptodate(eb);
1376 }