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 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <uuid/uuid.h>
  26 #include "kerncompat.h"
  27 #include "radix-tree.h"
  28 #include "ctree.h"
  29 #include "disk-io.h"
  30 #include "volumes.h"
  31 #include "transaction.h"
  32 #include "crc32c.h"
  33 #include "utils.h"
  34 #include "print-tree.h"
  35 #include "rbtree-utils.h"
  36
  37 /* specified errno for check_tree_block */
  38 #define BTRFS_BAD_BYTENR                (-1)
  39 #define BTRFS_BAD_FSID                  (-2)
  40 #define BTRFS_BAD_LEVEL                 (-3)
  41 #define BTRFS_BAD_NRITEMS               (-4)
  42
  43 /* Calculate max possible nritems for a leaf/node */
  44 static u32 max_nritems(u8 level, u32 nodesize)
  45 {
  46
  47         if (level == 0)
  48                 return ((nodesize - sizeof(struct btrfs_header)) /
  49                         sizeof(struct btrfs_item));
  50         return ((nodesize - sizeof(struct btrfs_header)) /
  51                 sizeof(struct btrfs_key_ptr));
  52 }
  53
  54 static int check_tree_block(struct btrfs_fs_info *fs_info,
  55                             struct extent_buffer *buf)
  56 {
  57
  58         struct btrfs_fs_devices *fs_devices;
  59         u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
  60         int ret = BTRFS_BAD_FSID;
  61
  62         if (buf->start != btrfs_header_bytenr(buf))
  63                 return BTRFS_BAD_BYTENR;
  64         if (btrfs_header_level(buf) >= BTRFS_MAX_LEVEL)
  65                 return BTRFS_BAD_LEVEL;
  66         if (btrfs_header_nritems(buf) > max_nritems(btrfs_header_level(buf),
  67                                                     nodesize))
  68                 return BTRFS_BAD_NRITEMS;
  69
  70         /* Only leaf can be empty */
  71         if (btrfs_header_nritems(buf) == 0 &&
  72             btrfs_header_level(buf) != 0)
  73                 return BTRFS_BAD_NRITEMS;
  74
  75         fs_devices = fs_info->fs_devices;
  76         while (fs_devices) {
  77                 if (fs_info->ignore_fsid_mismatch ||
  78                     !memcmp_extent_buffer(buf, fs_devices->fsid,
  79                                           btrfs_header_fsid(),
  80                                           BTRFS_FSID_SIZE)) {
  81                         ret = 0;
  82                         break;
  83                 }
  84                 fs_devices = fs_devices->seed;
  85         }
  86         return ret;
  87 }
  88
  89 static void print_tree_block_error(struct btrfs_fs_info *fs_info,
  90                                 struct extent_buffer *eb,
  91                                 int err)
  92 {
  93         char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
  94         char found_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
  95         u8 buf[BTRFS_UUID_SIZE];
  96
  97         switch (err) {
  98         case BTRFS_BAD_FSID:
  99                 read_extent_buffer(eb, buf, btrfs_header_fsid(),
 100                                    BTRFS_UUID_SIZE);
 101                 uuid_unparse(buf, found_uuid);
 102                 uuid_unparse(fs_info->fsid, fs_uuid);
 103                 fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
 104                         fs_uuid, found_uuid);
 105                 break;
 106         case BTRFS_BAD_BYTENR:
 107                 fprintf(stderr, "bytenr mismatch, want=%llu, have=%llu\n",
 108                         eb->start, btrfs_header_bytenr(eb));
 109                 break;
 110         case BTRFS_BAD_LEVEL:
 111                 fprintf(stderr, "bad level, %u > %u\n",
 112                         btrfs_header_level(eb), BTRFS_MAX_LEVEL);
 113                 break;
 114         case BTRFS_BAD_NRITEMS:
 115                 fprintf(stderr, "invalid nr_items: %u\n",
 116                         btrfs_header_nritems(eb));
 117                 break;
 118         }
 119 }
 120
 121 u32 btrfs_csum_data(char *data, u32 seed, size_t len)
 122 {
 123         return crc32c(seed, data, len);
 124 }
 125
 126 void btrfs_csum_final(u32 crc, u8 *result)
 127 {
 128         put_unaligned_le32(~crc, result);
 129 }
 130
 131 static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
 132                                   int verify, int silent)
 133 {
 134         u8 result[BTRFS_CSUM_SIZE];
 135         u32 len;
 136         u32 crc = ~(u32)0;
 137
 138         len = buf->len - BTRFS_CSUM_SIZE;
 139         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
 140         btrfs_csum_final(crc, result);
 141
 142         if (verify) {
 143                 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
 144                         if (!silent)
 145                                 printk("checksum verify failed on %llu found %08X wanted %08X\n",
 146                                        (unsigned long long)buf->start,
 147                                        *((u32 *)result),
 148                                        *((u32*)(char *)buf->data));
 149                         return 1;
 150                 }
 151         } else {
 152                 write_extent_buffer(buf, result, 0, csum_size);
 153         }
 154         return 0;
 155 }
 156
 157 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
 158 {
 159         return __csum_tree_block_size(buf, csum_size, verify, 0);
 160 }
 161
 162 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
 163 {
 164         return __csum_tree_block_size(buf, csum_size, 1, 1);
 165 }
 166
 167 static int csum_tree_block_fs_info(struct btrfs_fs_info *fs_info,
 168                                    struct extent_buffer *buf, int verify)
 169 {
 170         u16 csum_size =
 171                 btrfs_super_csum_size(fs_info->super_copy);
 172         if (verify && fs_info->suppress_check_block_errors)
 173                 return verify_tree_block_csum_silent(buf, csum_size);
 174         return csum_tree_block_size(buf, csum_size, verify);
 175 }
 176
 177 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 178                            int verify)
 179 {
 180         return csum_tree_block_fs_info(root->fs_info, buf, verify);
 181 }
 182
 183 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 184                                             u64 bytenr, u32 blocksize)
 185 {
 186         return find_extent_buffer(&root->fs_info->extent_cache,
 187                                   bytenr, blocksize);
 188 }
 189
 190 struct extent_buffer* btrfs_find_create_tree_block(
 191                 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize)
 192 {
 193         return alloc_extent_buffer(&fs_info->extent_cache, bytenr, blocksize);
 194 }
 195
 196 void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
 197                           u64 parent_transid)
 198 {
 199         struct extent_buffer *eb;
 200         u64 length;
 201         struct btrfs_multi_bio *multi = NULL;
 202         struct btrfs_device *device;
 203
 204         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 205         if (!(eb && btrfs_buffer_uptodate(eb, parent_transid)) &&
 206             !btrfs_map_block(&root->fs_info->mapping_tree, READ,
 207                              bytenr, &length, &multi, 0, NULL)) {
 208                 device = multi->stripes[0].dev;
 209                 device->total_ios++;
 210                 blocksize = min(blocksize, (u32)SZ_64K);
 211                 readahead(device->fd, multi->stripes[0].physical, blocksize);
 212         }
 213
 214         free_extent_buffer(eb);
 215         kfree(multi);
 216 }
 217
 218 static int verify_parent_transid(struct extent_io_tree *io_tree,
 219                                  struct extent_buffer *eb, u64 parent_transid,
 220                                  int ignore)
 221 {
 222         int ret;
 223
 224         if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
 225                 return 0;
 226
 227         if (extent_buffer_uptodate(eb) &&
 228             btrfs_header_generation(eb) == parent_transid) {
 229                 ret = 0;
 230                 goto out;
 231         }
 232         printk("parent transid verify failed on %llu wanted %llu found %llu\n",
 233                (unsigned long long)eb->start,
 234                (unsigned long long)parent_transid,
 235                (unsigned long long)btrfs_header_generation(eb));
 236         if (ignore) {
 237                 eb->flags |= EXTENT_BAD_TRANSID;
 238                 printk("Ignoring transid failure\n");
 239                 return 0;
 240         }
 241
 242         ret = 1;
 243 out:
 244         clear_extent_buffer_uptodate(eb);
 245         return ret;
 246
 247 }
 248
 249
 250 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
 251 {
 252         unsigned long offset = 0;
 253         struct btrfs_multi_bio *multi = NULL;
 254         struct btrfs_device *device;
 255         int ret = 0;
 256         u64 read_len;
 257         unsigned long bytes_left = eb->len;
 258
 259         while (bytes_left) {
 260                 read_len = bytes_left;
 261                 device = NULL;
 262
 263                 if (!info->on_restoring &&
 264                     eb->start != BTRFS_SUPER_INFO_OFFSET) {
 265                         ret = btrfs_map_block(&info->mapping_tree, READ,
 266                                               eb->start + offset, &read_len, &multi,
 267                                               mirror, NULL);
 268                         if (ret) {
 269                                 printk("Couldn't map the block %Lu\n", eb->start + offset);
 270                                 kfree(multi);
 271                                 return -EIO;
 272                         }
 273                         device = multi->stripes[0].dev;
 274
 275                         if (device->fd <= 0) {
 276                                 kfree(multi);
 277                                 return -EIO;
 278                         }
 279
 280                         eb->fd = device->fd;
 281                         device->total_ios++;
 282                         eb->dev_bytenr = multi->stripes[0].physical;
 283                         kfree(multi);
 284                         multi = NULL;
 285                 } else {
 286                         /* special case for restore metadump */
 287                         list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
 288                                 if (device->devid == 1)
 289                                         break;
 290                         }
 291
 292                         eb->fd = device->fd;
 293                         eb->dev_bytenr = eb->start;
 294                         device->total_ios++;
 295                 }
 296
 297                 if (read_len > bytes_left)
 298                         read_len = bytes_left;
 299
 300                 ret = read_extent_from_disk(eb, offset, read_len);
 301                 if (ret)
 302                         return -EIO;
 303                 offset += read_len;
 304                 bytes_left -= read_len;
 305         }
 306         return 0;
 307 }
 308
 309 struct extent_buffer* read_tree_block_fs_info(
 310                 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
 311                 u64 parent_transid)
 312 {
 313         int ret;
 314         struct extent_buffer *eb;
 315         u64 best_transid = 0;
 316         u32 sectorsize = btrfs_super_sectorsize(fs_info->super_copy);
 317         u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
 318         int mirror_num = 0;
 319         int good_mirror = 0;
 320         int num_copies;
 321         int ignore = 0;
 322
 323         /*
 324          * Don't even try to create tree block for unaligned tree block
 325          * bytenr.
 326          * Such unaligned tree block will free overlapping extent buffer,
 327          * causing use-after-free bugs for fuzzed images.
 328          */
 329         if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
 330                 error("tree block bytenr %llu is not aligned to sectorsize %u",
 331                       bytenr, sectorsize);
 332                 return ERR_PTR(-EIO);
 333         }
 334         if (blocksize < nodesize || !IS_ALIGNED(blocksize, nodesize)) {
 335                 error("tree block size %u is not aligned to nodesize %u",
 336                       blocksize, nodesize);
 337                 return ERR_PTR(-EIO);
 338         }
 339
 340         eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
 341         if (!eb)
 342                 return ERR_PTR(-ENOMEM);
 343
 344         if (btrfs_buffer_uptodate(eb, parent_transid))
 345                 return eb;
 346
 347         while (1) {
 348                 ret = read_whole_eb(fs_info, eb, mirror_num);
 349                 if (ret == 0 && csum_tree_block_fs_info(fs_info, eb, 1) == 0 &&
 350                     check_tree_block(fs_info, eb) == 0 &&
 351                     verify_parent_transid(eb->tree, eb, parent_transid, ignore)
 352                     == 0) {
 353                         if (eb->flags & EXTENT_BAD_TRANSID &&
 354                             list_empty(&eb->recow)) {
 355                                 list_add_tail(&eb->recow,
 356                                               &fs_info->recow_ebs);
 357                                 eb->refs++;
 358                         }
 359                         btrfs_set_buffer_uptodate(eb);
 360                         return eb;
 361                 }
 362                 if (ignore) {
 363                         if (check_tree_block(fs_info, eb)) {
 364                                 if (!fs_info->suppress_check_block_errors)
 365                                         print_tree_block_error(fs_info, eb,
 366                                                 check_tree_block(fs_info, eb));
 367                         } else {
 368                                 if (!fs_info->suppress_check_block_errors)
 369                                         fprintf(stderr, "Csum didn't match\n");
 370                         }
 371                         ret = -EIO;
 372                         break;
 373                 }
 374                 num_copies = btrfs_num_copies(&fs_info->mapping_tree,
 375                                               eb->start, eb->len);
 376                 if (num_copies == 1) {
 377                         ignore = 1;
 378                         continue;
 379                 }
 380                 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
 381                         best_transid = btrfs_header_generation(eb);
 382                         good_mirror = mirror_num;
 383                 }
 384                 mirror_num++;
 385                 if (mirror_num > num_copies) {
 386                         mirror_num = good_mirror;
 387                         ignore = 1;
 388                         continue;
 389                 }
 390         }
 391         free_extent_buffer(eb);
 392         return ERR_PTR(ret);
 393 }
 394
 395 int read_extent_data(struct btrfs_root *root, char *data,
 396                            u64 logical, u64 *len, int mirror)
 397 {
 398         u64 offset = 0;
 399         struct btrfs_multi_bio *multi = NULL;
 400         struct btrfs_fs_info *info = root->fs_info;
 401         struct btrfs_device *device;
 402         int ret = 0;
 403         u64 max_len = *len;
 404
 405         ret = btrfs_map_block(&info->mapping_tree, READ, logical, len,
 406                               &multi, mirror, NULL);
 407         if (ret) {
 408                 fprintf(stderr, "Couldn't map the block %llu\n",
 409                                 logical + offset);
 410                 goto err;
 411         }
 412         device = multi->stripes[0].dev;
 413
 414         if (device->fd <= 0)
 415                 goto err;
 416         if (*len > max_len)
 417                 *len = max_len;
 418
 419         ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
 420         if (ret != *len)
 421                 ret = -EIO;
 422         else
 423                 ret = 0;
 424 err:
 425         kfree(multi);
 426         return ret;
 427 }
 428
 429 int write_and_map_eb(struct btrfs_root *root, struct extent_buffer *eb)
 430 {
 431         int ret;
 432         int dev_nr;
 433         u64 length;
 434         u64 *raid_map = NULL;
 435         struct btrfs_multi_bio *multi = NULL;
 436
 437         dev_nr = 0;
 438         length = eb->len;
 439         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 440                               eb->start, &length, &multi, 0, &raid_map);
 441
 442         if (raid_map) {
 443                 ret = write_raid56_with_parity(root->fs_info, eb, multi,
 444                                                length, raid_map);
 445                 BUG_ON(ret);
 446         } else while (dev_nr < multi->num_stripes) {
 447                 BUG_ON(ret);
 448                 eb->fd = multi->stripes[dev_nr].dev->fd;
 449                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 450                 multi->stripes[dev_nr].dev->total_ios++;
 451                 dev_nr++;
 452                 ret = write_extent_to_disk(eb);
 453                 BUG_ON(ret);
 454         }
 455         kfree(raid_map);
 456         kfree(multi);
 457         return 0;
 458 }
 459
 460 int write_tree_block(struct btrfs_trans_handle *trans,
 461                      struct btrfs_root *root,
 462                      struct extent_buffer *eb)
 463 {
 464         if (check_tree_block(root->fs_info, eb)) {
 465                 print_tree_block_error(root->fs_info, eb,
 466                                 check_tree_block(root->fs_info, eb));
 467                 BUG();
 468         }
 469
 470         if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
 471                 BUG();
 472
 473         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 474         csum_tree_block(root, eb, 0);
 475
 476         return write_and_map_eb(root, eb);
 477 }
 478
 479 void btrfs_setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 480                         u32 stripesize, struct btrfs_root *root,
 481                         struct btrfs_fs_info *fs_info, u64 objectid)
 482 {
 483         root->node = NULL;
 484         root->commit_root = NULL;
 485         root->sectorsize = sectorsize;
 486         root->nodesize = nodesize;
 487         root->leafsize = leafsize;
 488         root->stripesize = stripesize;
 489         root->ref_cows = 0;
 490         root->track_dirty = 0;
 491
 492         root->fs_info = fs_info;
 493         root->objectid = objectid;
 494         root->last_trans = 0;
 495         root->last_inode_alloc = 0;
 496
 497         INIT_LIST_HEAD(&root->dirty_list);
 498         INIT_LIST_HEAD(&root->orphan_data_extents);
 499         memset(&root->root_key, 0, sizeof(root->root_key));
 500         memset(&root->root_item, 0, sizeof(root->root_item));
 501         root->root_key.objectid = objectid;
 502 }
 503
 504 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 505                                struct btrfs_root *root)
 506 {
 507         int ret;
 508         u64 old_root_bytenr;
 509         struct btrfs_root *tree_root = root->fs_info->tree_root;
 510
 511         btrfs_write_dirty_block_groups(trans, root);
 512         while(1) {
 513                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 514                 if (old_root_bytenr == root->node->start)
 515                         break;
 516                 btrfs_set_root_bytenr(&root->root_item,
 517                                        root->node->start);
 518                 btrfs_set_root_generation(&root->root_item,
 519                                           trans->transid);
 520                 root->root_item.level = btrfs_header_level(root->node);
 521                 ret = btrfs_update_root(trans, tree_root,
 522                                         &root->root_key,
 523                                         &root->root_item);
 524                 BUG_ON(ret);
 525                 btrfs_write_dirty_block_groups(trans, root);
 526         }
 527         return 0;
 528 }
 529
 530 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 531                              struct btrfs_fs_info *fs_info)
 532 {
 533         struct btrfs_root *root;
 534         struct list_head *next;
 535         struct extent_buffer *eb;
 536         int ret;
 537
 538         if (fs_info->readonly)
 539                 return 0;
 540
 541         eb = fs_info->tree_root->node;
 542         extent_buffer_get(eb);
 543         ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 544         free_extent_buffer(eb);
 545         if (ret)
 546                 return ret;
 547
 548         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 549                 next = fs_info->dirty_cowonly_roots.next;
 550                 list_del_init(next);
 551                 root = list_entry(next, struct btrfs_root, dirty_list);
 552                 update_cowonly_root(trans, root);
 553                 free_extent_buffer(root->commit_root);
 554                 root->commit_root = NULL;
 555         }
 556
 557         return 0;
 558 }
 559
 560 static int __commit_transaction(struct btrfs_trans_handle *trans,
 561                                 struct btrfs_root *root)
 562 {
 563         u64 start;
 564         u64 end;
 565         struct extent_buffer *eb;
 566         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 567         int ret;
 568
 569         while(1) {
 570                 ret = find_first_extent_bit(tree, 0, &start, &end,
 571                                             EXTENT_DIRTY);
 572                 if (ret)
 573                         break;
 574                 while(start <= end) {
 575                         eb = find_first_extent_buffer(tree, start);
 576                         BUG_ON(!eb || eb->start != start);
 577                         ret = write_tree_block(trans, root, eb);
 578                         BUG_ON(ret);
 579                         start += eb->len;
 580                         clear_extent_buffer_dirty(eb);
 581                         free_extent_buffer(eb);
 582                 }
 583         }
 584         return 0;
 585 }
 586
 587 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 588                              struct btrfs_root *root)
 589 {
 590         u64 transid = trans->transid;
 591         int ret = 0;
 592         struct btrfs_fs_info *fs_info = root->fs_info;
 593
 594         if (root->commit_root == root->node)
 595                 goto commit_tree;
 596         if (root == root->fs_info->tree_root)
 597                 goto commit_tree;
 598         if (root == root->fs_info->chunk_root)
 599                 goto commit_tree;
 600
 601         free_extent_buffer(root->commit_root);
 602         root->commit_root = NULL;
 603
 604         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 605         btrfs_set_root_generation(&root->root_item, trans->transid);
 606         root->root_item.level = btrfs_header_level(root->node);
 607         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 608                                 &root->root_key, &root->root_item);
 609         BUG_ON(ret);
 610 commit_tree:
 611         ret = commit_tree_roots(trans, fs_info);
 612         BUG_ON(ret);
 613         ret = __commit_transaction(trans, root);
 614         BUG_ON(ret);
 615         write_ctree_super(trans, root);
 616         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 617                                    &fs_info->pinned_extents);
 618         kfree(trans);
 619         free_extent_buffer(root->commit_root);
 620         root->commit_root = NULL;
 621         fs_info->running_transaction = NULL;
 622         fs_info->last_trans_committed = transid;
 623         return 0;
 624 }
 625
 626 static int find_and_setup_root(struct btrfs_root *tree_root,
 627                                struct btrfs_fs_info *fs_info,
 628                                u64 objectid, struct btrfs_root *root)
 629 {
 630         int ret;
 631         u32 blocksize;
 632         u64 generation;
 633
 634         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 635                      tree_root->sectorsize, tree_root->stripesize,
 636                      root, fs_info, objectid);
 637         ret = btrfs_find_last_root(tree_root, objectid,
 638                                    &root->root_item, &root->root_key);
 639         if (ret)
 640                 return ret;
 641
 642         blocksize = root->nodesize;
 643         generation = btrfs_root_generation(&root->root_item);
 644         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 645                                      blocksize, generation);
 646         if (!extent_buffer_uptodate(root->node))
 647                 return -EIO;
 648
 649         return 0;
 650 }
 651
 652 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 653                                struct btrfs_fs_info *fs_info,
 654                                struct btrfs_super_block *disk_super)
 655 {
 656         u32 blocksize;
 657         u64 blocknr = btrfs_super_log_root(disk_super);
 658         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 659
 660         if (!log_root)
 661                 return -ENOMEM;
 662
 663         if (blocknr == 0) {
 664                 free(log_root);
 665                 return 0;
 666         }
 667
 668         blocksize = tree_root->nodesize;
 669
 670         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 671                      tree_root->sectorsize, tree_root->stripesize,
 672                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 673
 674         log_root->node = read_tree_block(tree_root, blocknr,
 675                                      blocksize,
 676                                      btrfs_super_generation(disk_super) + 1);
 677
 678         fs_info->log_root_tree = log_root;
 679
 680         if (!extent_buffer_uptodate(log_root->node)) {
 681                 free_extent_buffer(log_root->node);
 682                 free(log_root);
 683                 fs_info->log_root_tree = NULL;
 684                 return -EIO;
 685         }
 686
 687         return 0;
 688 }
 689
 690 int btrfs_free_fs_root(struct btrfs_root *root)
 691 {
 692         if (root->node)
 693                 free_extent_buffer(root->node);
 694         if (root->commit_root)
 695                 free_extent_buffer(root->commit_root);
 696         kfree(root);
 697         return 0;
 698 }
 699
 700 static void __free_fs_root(struct rb_node *node)
 701 {
 702         struct btrfs_root *root;
 703
 704         root = container_of(node, struct btrfs_root, rb_node);
 705         btrfs_free_fs_root(root);
 706 }
 707
 708 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
 709
 710 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 711                                                struct btrfs_key *location)
 712 {
 713         struct btrfs_root *root;
 714         struct btrfs_root *tree_root = fs_info->tree_root;
 715         struct btrfs_path *path;
 716         struct extent_buffer *l;
 717         u64 generation;
 718         u32 blocksize;
 719         int ret = 0;
 720
 721         root = calloc(1, sizeof(*root));
 722         if (!root)
 723                 return ERR_PTR(-ENOMEM);
 724         if (location->offset == (u64)-1) {
 725                 ret = find_and_setup_root(tree_root, fs_info,
 726                                           location->objectid, root);
 727                 if (ret) {
 728                         free(root);
 729                         return ERR_PTR(ret);
 730                 }
 731                 goto insert;
 732         }
 733
 734         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 735                      tree_root->sectorsize, tree_root->stripesize,
 736                      root, fs_info, location->objectid);
 737
 738         path = btrfs_alloc_path();
 739         if (!path) {
 740                 free(root);
 741                 return ERR_PTR(-ENOMEM);
 742         }
 743
 744         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 745         if (ret != 0) {
 746                 if (ret > 0)
 747                         ret = -ENOENT;
 748                 goto out;
 749         }
 750         l = path->nodes[0];
 751         read_extent_buffer(l, &root->root_item,
 752                btrfs_item_ptr_offset(l, path->slots[0]),
 753                sizeof(root->root_item));
 754         memcpy(&root->root_key, location, sizeof(*location));
 755         ret = 0;
 756 out:
 757         btrfs_free_path(path);
 758         if (ret) {
 759                 free(root);
 760                 return ERR_PTR(ret);
 761         }
 762         generation = btrfs_root_generation(&root->root_item);
 763         blocksize = root->nodesize;
 764         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 765                                      blocksize, generation);
 766         if (!extent_buffer_uptodate(root->node)) {
 767                 free(root);
 768                 return ERR_PTR(-EIO);
 769         }
 770 insert:
 771         root->ref_cows = 1;
 772         return root;
 773 }
 774
 775 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
 776                                             void *data)
 777 {
 778         u64 objectid = *((u64 *)data);
 779         struct btrfs_root *root;
 780
 781         root = rb_entry(node, struct btrfs_root, rb_node);
 782         if (objectid > root->objectid)
 783                 return 1;
 784         else if (objectid < root->objectid)
 785                 return -1;
 786         else
 787                 return 0;
 788 }
 789
 790 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
 791                                         struct rb_node *node2)
 792 {
 793         struct btrfs_root *root;
 794
 795         root = rb_entry(node2, struct btrfs_root, rb_node);
 796         return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
 797 }
 798
 799 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 800                                       struct btrfs_key *location)
 801 {
 802         struct btrfs_root *root;
 803         struct rb_node *node;
 804         int ret;
 805         u64 objectid = location->objectid;
 806
 807         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 808                 return fs_info->tree_root;
 809         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 810                 return fs_info->extent_root;
 811         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 812                 return fs_info->chunk_root;
 813         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 814                 return fs_info->dev_root;
 815         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 816                 return fs_info->csum_root;
 817         if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
 818                 return fs_info->quota_enabled ? fs_info->quota_root :
 819                                 ERR_PTR(-ENOENT);
 820
 821         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 822                location->offset != (u64)-1);
 823
 824         node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
 825                          btrfs_fs_roots_compare_objectids, NULL);
 826         if (node)
 827                 return container_of(node, struct btrfs_root, rb_node);
 828
 829         root = btrfs_read_fs_root_no_cache(fs_info, location);
 830         if (IS_ERR(root))
 831                 return root;
 832
 833         ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
 834                         btrfs_fs_roots_compare_roots);
 835         BUG_ON(ret);
 836         return root;
 837 }
 838
 839 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 840 {
 841         if (fs_info->quota_root)
 842                 free(fs_info->quota_root);
 843
 844         free(fs_info->tree_root);
 845         free(fs_info->extent_root);
 846         free(fs_info->chunk_root);
 847         free(fs_info->dev_root);
 848         free(fs_info->csum_root);
 849         free(fs_info->free_space_root);
 850         free(fs_info->super_copy);
 851         free(fs_info->log_root_tree);
 852         free(fs_info);
 853 }
 854
 855 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
 856 {
 857         struct btrfs_fs_info *fs_info;
 858
 859         fs_info = calloc(1, sizeof(struct btrfs_fs_info));
 860         if (!fs_info)
 861                 return NULL;
 862
 863         fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
 864         fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
 865         fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
 866         fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
 867         fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
 868         fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
 869         fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
 870         fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
 871
 872         if (!fs_info->tree_root || !fs_info->extent_root ||
 873             !fs_info->chunk_root || !fs_info->dev_root ||
 874             !fs_info->csum_root || !fs_info->quota_root ||
 875             !fs_info->free_space_root || !fs_info->super_copy)
 876                 goto free_all;
 877
 878         extent_io_tree_init(&fs_info->extent_cache);
 879         extent_io_tree_init(&fs_info->free_space_cache);
 880         extent_io_tree_init(&fs_info->block_group_cache);
 881         extent_io_tree_init(&fs_info->pinned_extents);
 882         extent_io_tree_init(&fs_info->pending_del);
 883         extent_io_tree_init(&fs_info->extent_ins);
 884         fs_info->excluded_extents = NULL;
 885
 886         fs_info->fs_root_tree = RB_ROOT;
 887         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 888
 889         mutex_init(&fs_info->fs_mutex);
 890         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 891         INIT_LIST_HEAD(&fs_info->space_info);
 892         INIT_LIST_HEAD(&fs_info->recow_ebs);
 893
 894         if (!writable)
 895                 fs_info->readonly = 1;
 896
 897         fs_info->super_bytenr = sb_bytenr;
 898         fs_info->data_alloc_profile = (u64)-1;
 899         fs_info->metadata_alloc_profile = (u64)-1;
 900         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 901         return fs_info;
 902 free_all:
 903         btrfs_free_fs_info(fs_info);
 904         return NULL;
 905 }
 906
 907 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
 908                                  unsigned int flags)
 909 {
 910         u64 features;
 911
 912         features = btrfs_super_incompat_flags(sb) &
 913                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 914         if (features) {
 915                 printk("couldn't open because of unsupported "
 916                        "option features (%Lx).\n",
 917                        (unsigned long long)features);
 918                 return -ENOTSUP;
 919         }
 920
 921         features = btrfs_super_incompat_flags(sb);
 922         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 923                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 924                 btrfs_set_super_incompat_flags(sb, features);
 925         }
 926
 927         features = btrfs_super_compat_ro_flags(sb);
 928         if (flags & OPEN_CTREE_WRITES) {
 929                 if (flags & OPEN_CTREE_INVALIDATE_FST) {
 930                         /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
 931                         features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
 932                         btrfs_set_super_compat_ro_flags(sb, features);
 933                         /* ... and ignore the free space tree bit. */
 934                         features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
 935                 }
 936                 if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
 937                         printk("couldn't open RDWR because of unsupported "
 938                                "option features (%Lx).\n",
 939                                (unsigned long long)features);
 940                         return -ENOTSUP;
 941                 }
 942
 943         }
 944         return 0;
 945 }
 946
 947 static int find_best_backup_root(struct btrfs_super_block *super)
 948 {
 949         struct btrfs_root_backup *backup;
 950         u64 orig_gen = btrfs_super_generation(super);
 951         u64 gen = 0;
 952         int best_index = 0;
 953         int i;
 954
 955         for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
 956                 backup = super->super_roots + i;
 957                 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
 958                     btrfs_backup_tree_root_gen(backup) > gen) {
 959                         best_index = i;
 960                         gen = btrfs_backup_tree_root_gen(backup);
 961                 }
 962         }
 963         return best_index;
 964 }
 965
 966 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
 967                                       unsigned flags,
 968                                       struct btrfs_root *info_root,
 969                                       u64 objectid, char *str)
 970 {
 971         struct btrfs_super_block *sb = fs_info->super_copy;
 972         struct btrfs_root *root = fs_info->tree_root;
 973         u32 nodesize = btrfs_super_nodesize(sb);
 974         int ret;
 975
 976         ret = find_and_setup_root(root, fs_info, objectid, info_root);
 977         if (ret) {
 978                 printk("Couldn't setup %s tree\n", str);
 979                 if (!(flags & OPEN_CTREE_PARTIAL))
 980                         return -EIO;
 981                 /*
 982                  * Need a blank node here just so we don't screw up in the
 983                  * million of places that assume a root has a valid ->node
 984                  */
 985                 info_root->node =
 986                         btrfs_find_create_tree_block(fs_info, 0, nodesize);
 987                 if (!info_root->node)
 988                         return -ENOMEM;
 989                 clear_extent_buffer_uptodate(info_root->node);
 990         }
 991
 992         return 0;
 993 }
 994
 995 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
 996                           unsigned flags)
 997 {
 998         struct btrfs_super_block *sb = fs_info->super_copy;
 999         struct btrfs_root *root;
1000         struct btrfs_key key;
1001         u32 sectorsize;
1002         u32 nodesize;
1003         u32 leafsize;
1004         u32 stripesize;
1005         u64 generation;
1006         u32 blocksize;
1007         int ret;
1008
1009         nodesize = btrfs_super_nodesize(sb);
1010         leafsize = btrfs_super_leafsize(sb);
1011         sectorsize = btrfs_super_sectorsize(sb);
1012         stripesize = btrfs_super_stripesize(sb);
1013
1014         root = fs_info->tree_root;
1015         btrfs_setup_root(nodesize, leafsize, sectorsize, stripesize,
1016                      root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
1017         blocksize = root->nodesize;
1018         generation = btrfs_super_generation(sb);
1019
1020         if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
1021                 root_tree_bytenr = btrfs_super_root(sb);
1022         } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
1023                 struct btrfs_root_backup *backup;
1024                 int index = find_best_backup_root(sb);
1025                 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
1026                         fprintf(stderr, "Invalid backup root number\n");
1027                         return -EIO;
1028                 }
1029                 backup = fs_info->super_copy->super_roots + index;
1030                 root_tree_bytenr = btrfs_backup_tree_root(backup);
1031                 generation = btrfs_backup_tree_root_gen(backup);
1032         }
1033
1034         root->node = read_tree_block(root, root_tree_bytenr, blocksize,
1035                                      generation);
1036         if (!extent_buffer_uptodate(root->node)) {
1037                 fprintf(stderr, "Couldn't read tree root\n");
1038                 return -EIO;
1039         }
1040
1041         ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
1042                                          BTRFS_EXTENT_TREE_OBJECTID, "extent");
1043         if (ret)
1044                 return ret;
1045         fs_info->extent_root->track_dirty = 1;
1046
1047         ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1048                                   fs_info->dev_root);
1049         if (ret) {
1050                 printk("Couldn't setup device tree\n");
1051                 return -EIO;
1052         }
1053         fs_info->dev_root->track_dirty = 1;
1054
1055         ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1056                                          BTRFS_CSUM_TREE_OBJECTID, "csum");
1057         if (ret)
1058                 return ret;
1059         fs_info->csum_root->track_dirty = 1;
1060
1061         ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1062                                   fs_info->quota_root);
1063         if (ret) {
1064                 free(fs_info->quota_root);
1065                 fs_info->quota_root = NULL;
1066         } else {
1067                 fs_info->quota_enabled = 1;
1068         }
1069
1070         if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
1071                 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1072                                           fs_info->free_space_root);
1073                 if (ret) {
1074                         printk("Couldn't read free space tree\n");
1075                         return -EIO;
1076                 }
1077                 fs_info->free_space_root->track_dirty = 1;
1078         }
1079
1080         ret = find_and_setup_log_root(root, fs_info, sb);
1081         if (ret) {
1082                 printk("Couldn't setup log root tree\n");
1083                 if (!(flags & OPEN_CTREE_PARTIAL))
1084                         return -EIO;
1085         }
1086
1087         fs_info->generation = generation;
1088         fs_info->last_trans_committed = generation;
1089         if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1090             !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1091                 btrfs_read_block_groups(fs_info->tree_root);
1092
1093         key.objectid = BTRFS_FS_TREE_OBJECTID;
1094         key.type = BTRFS_ROOT_ITEM_KEY;
1095         key.offset = (u64)-1;
1096         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1097
1098         if (IS_ERR(fs_info->fs_root))
1099                 return -EIO;
1100         return 0;
1101 }
1102
1103 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1104 {
1105         if (fs_info->free_space_root)
1106                 free_extent_buffer(fs_info->free_space_root->node);
1107         if (fs_info->quota_root)
1108                 free_extent_buffer(fs_info->quota_root->node);
1109         if (fs_info->csum_root)
1110                 free_extent_buffer(fs_info->csum_root->node);
1111         if (fs_info->dev_root)
1112                 free_extent_buffer(fs_info->dev_root->node);
1113         if (fs_info->extent_root)
1114                 free_extent_buffer(fs_info->extent_root->node);
1115         if (fs_info->tree_root)
1116                 free_extent_buffer(fs_info->tree_root->node);
1117         if (fs_info->log_root_tree)
1118                 free_extent_buffer(fs_info->log_root_tree->node);
1119         if (fs_info->chunk_root)
1120                 free_extent_buffer(fs_info->chunk_root->node);
1121 }
1122
1123 static void free_map_lookup(struct cache_extent *ce)
1124 {
1125         struct map_lookup *map;
1126
1127         map = container_of(ce, struct map_lookup, ce);
1128         kfree(map);
1129 }
1130
1131 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1132
1133 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1134 {
1135         while (!list_empty(&fs_info->recow_ebs)) {
1136                 struct extent_buffer *eb;
1137                 eb = list_first_entry(&fs_info->recow_ebs,
1138                                       struct extent_buffer, recow);
1139                 list_del_init(&eb->recow);
1140                 free_extent_buffer(eb);
1141         }
1142         free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1143         extent_io_tree_cleanup(&fs_info->extent_cache);
1144         extent_io_tree_cleanup(&fs_info->free_space_cache);
1145         extent_io_tree_cleanup(&fs_info->block_group_cache);
1146         extent_io_tree_cleanup(&fs_info->pinned_extents);
1147         extent_io_tree_cleanup(&fs_info->pending_del);
1148         extent_io_tree_cleanup(&fs_info->extent_ins);
1149 }
1150
1151 int btrfs_scan_fs_devices(int fd, const char *path,
1152                           struct btrfs_fs_devices **fs_devices,
1153                           u64 sb_bytenr, unsigned sbflags,
1154                           int skip_devices)
1155 {
1156         u64 total_devs;
1157         u64 dev_size;
1158         off_t seek_ret;
1159         int ret;
1160         if (!sb_bytenr)
1161                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1162
1163         seek_ret = lseek(fd, 0, SEEK_END);
1164         if (seek_ret < 0)
1165                 return -errno;
1166
1167         dev_size = seek_ret;
1168         lseek(fd, 0, SEEK_SET);
1169         if (sb_bytenr > dev_size) {
1170                 error("superblock bytenr %llu is larger than device size %llu",
1171                                 (unsigned long long)sb_bytenr,
1172                                 (unsigned long long)dev_size);
1173                 return -EINVAL;
1174         }
1175
1176         ret = btrfs_scan_one_device(fd, path, fs_devices,
1177                                     &total_devs, sb_bytenr, sbflags);
1178         if (ret) {
1179                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1180                 return ret;
1181         }
1182
1183         if (!skip_devices && total_devs != 1) {
1184                 ret = btrfs_scan_devices();
1185                 if (ret)
1186                         return ret;
1187         }
1188         return 0;
1189 }
1190
1191 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1192                                           u64 chunk_root_bytenr)
1193 {
1194         struct btrfs_super_block *sb = fs_info->super_copy;
1195         u32 sectorsize;
1196         u32 nodesize;
1197         u32 leafsize;
1198         u32 blocksize;
1199         u32 stripesize;
1200         u64 generation;
1201         int ret;
1202
1203         nodesize = btrfs_super_nodesize(sb);
1204         leafsize = btrfs_super_leafsize(sb);
1205         sectorsize = btrfs_super_sectorsize(sb);
1206         stripesize = btrfs_super_stripesize(sb);
1207
1208         btrfs_setup_root(nodesize, leafsize, sectorsize, stripesize,
1209                      fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1210
1211         ret = btrfs_read_sys_array(fs_info->chunk_root);
1212         if (ret)
1213                 return ret;
1214
1215         blocksize = fs_info->chunk_root->nodesize;
1216         generation = btrfs_super_chunk_root_generation(sb);
1217
1218         if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1219                                             btrfs_super_sectorsize(sb))) {
1220                 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1221                         chunk_root_bytenr, btrfs_super_sectorsize(sb));
1222                 chunk_root_bytenr = 0;
1223         }
1224
1225         if (!chunk_root_bytenr)
1226                 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1227         else
1228                 generation = 0;
1229
1230         fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
1231                                                     chunk_root_bytenr,
1232                                                     blocksize, generation);
1233         if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1234                 if (fs_info->ignore_chunk_tree_error) {
1235                         warning("cannot read chunk root, continue anyway");
1236                         fs_info->chunk_root = NULL;
1237                         return 0;
1238                 } else {
1239                         error("cannot read chunk root");
1240                         return -EIO;
1241                 }
1242         }
1243
1244         if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1245                 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1246                 if (ret) {
1247                         fprintf(stderr, "Couldn't read chunk tree\n");
1248                         return ret;
1249                 }
1250         }
1251         return 0;
1252 }
1253
1254 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1255                                              u64 sb_bytenr,
1256                                              u64 root_tree_bytenr,
1257                                              u64 chunk_root_bytenr,
1258                                              unsigned flags)
1259 {
1260         struct btrfs_fs_info *fs_info;
1261         struct btrfs_super_block *disk_super;
1262         struct btrfs_fs_devices *fs_devices = NULL;
1263         struct extent_buffer *eb;
1264         int ret;
1265         int oflags;
1266         unsigned sbflags = SBREAD_DEFAULT;
1267
1268         if (sb_bytenr == 0)
1269                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1270
1271         /* try to drop all the caches */
1272         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1273                 fprintf(stderr, "Warning, could not drop caches\n");
1274
1275         fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1276         if (!fs_info) {
1277                 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1278                 return NULL;
1279         }
1280         if (flags & OPEN_CTREE_RESTORE)
1281                 fs_info->on_restoring = 1;
1282         if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1283                 fs_info->suppress_check_block_errors = 1;
1284         if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1285                 fs_info->ignore_fsid_mismatch = 1;
1286         if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1287                 fs_info->ignore_chunk_tree_error = 1;
1288
1289         if ((flags & OPEN_CTREE_RECOVER_SUPER)
1290              && (flags & OPEN_CTREE_FS_PARTIAL)) {
1291                 fprintf(stderr,
1292                     "cannot open a partially created filesystem for recovery");
1293                 goto out;
1294         }
1295
1296         if (flags & OPEN_CTREE_FS_PARTIAL)
1297                 sbflags = SBREAD_PARTIAL;
1298
1299         ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1300                         (flags & OPEN_CTREE_NO_DEVICES));
1301         if (ret)
1302                 goto out;
1303
1304         fs_info->fs_devices = fs_devices;
1305         if (flags & OPEN_CTREE_WRITES)
1306                 oflags = O_RDWR;
1307         else
1308                 oflags = O_RDONLY;
1309
1310         if (flags & OPEN_CTREE_EXCLUSIVE)
1311                 oflags |= O_EXCL;
1312
1313         ret = btrfs_open_devices(fs_devices, oflags);
1314         if (ret)
1315                 goto out;
1316
1317         disk_super = fs_info->super_copy;
1318         if (flags & OPEN_CTREE_RECOVER_SUPER)
1319                 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1320                                 sb_bytenr, SBREAD_RECOVER);
1321         else
1322                 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1323                                 sbflags);
1324         if (ret) {
1325                 printk("No valid btrfs found\n");
1326                 goto out_devices;
1327         }
1328
1329         if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1330             !fs_info->ignore_fsid_mismatch) {
1331                 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1332                 goto out_devices;
1333         }
1334
1335         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1336
1337         ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
1338         if (ret)
1339                 goto out_devices;
1340
1341         ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1342         if (ret)
1343                 goto out_chunk;
1344
1345         /* Chunk tree root is unable to read, return directly */
1346         if (!fs_info->chunk_root)
1347                 return fs_info;
1348
1349         eb = fs_info->chunk_root->node;
1350         read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1351                            btrfs_header_chunk_tree_uuid(eb),
1352                            BTRFS_UUID_SIZE);
1353
1354         ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1355         if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1356             !fs_info->ignore_chunk_tree_error)
1357                 goto out_chunk;
1358
1359         return fs_info;
1360
1361 out_chunk:
1362         btrfs_release_all_roots(fs_info);
1363         btrfs_cleanup_all_caches(fs_info);
1364 out_devices:
1365         btrfs_close_devices(fs_devices);
1366 out:
1367         btrfs_free_fs_info(fs_info);
1368         return NULL;
1369 }
1370
1371 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1372                                          u64 sb_bytenr, u64 root_tree_bytenr,
1373                                          u64 chunk_root_bytenr,
1374                                          unsigned flags)
1375 {
1376         int fp;
1377         int ret;
1378         struct btrfs_fs_info *info;
1379         int oflags = O_RDWR;
1380         struct stat st;
1381
1382         ret = stat(filename, &st);
1383         if (ret < 0) {
1384                 error("cannot stat '%s': %s", filename, strerror(errno));
1385                 return NULL;
1386         }
1387         if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1388                 error("not a regular file or block device: %s", filename);
1389                 return NULL;
1390         }
1391
1392         if (!(flags & OPEN_CTREE_WRITES))
1393                 oflags = O_RDONLY;
1394
1395         fp = open(filename, oflags);
1396         if (fp < 0) {
1397                 error("cannot open '%s': %s", filename, strerror(errno));
1398                 return NULL;
1399         }
1400         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1401                                chunk_root_bytenr, flags);
1402         close(fp);
1403         return info;
1404 }
1405
1406 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1407                               unsigned flags)
1408 {
1409         struct btrfs_fs_info *info;
1410
1411         /* This flags may not return fs_info with any valid root */
1412         BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1413         info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1414         if (!info)
1415                 return NULL;
1416         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1417                 return info->chunk_root;
1418         return info->fs_root;
1419 }
1420
1421 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1422                                  unsigned flags)
1423 {
1424         struct btrfs_fs_info *info;
1425
1426         /* This flags may not return fs_info with any valid root */
1427         if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
1428                 error("invalid open_ctree flags: 0x%llx",
1429                                 (unsigned long long)flags);
1430                 return NULL;
1431         }
1432         info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1433         if (!info)
1434                 return NULL;
1435         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1436                 return info->chunk_root;
1437         return info->fs_root;
1438 }
1439
1440 /*
1441  * Check if the super is valid:
1442  * - nodesize/sectorsize - minimum, maximum, alignment
1443  * - tree block starts   - alignment
1444  * - number of devices   - something sane
1445  * - sys array size      - maximum
1446  */
1447 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1448 {
1449         u8 result[BTRFS_CSUM_SIZE];
1450         u32 crc;
1451         u16 csum_type;
1452         int csum_size;
1453
1454         if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1455                 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1456                         if (!(sbflags & SBREAD_PARTIAL)) {
1457                                 error("superblock magic doesn't match");
1458                                 return -EIO;
1459                         }
1460                 }
1461         }
1462
1463         csum_type = btrfs_super_csum_type(sb);
1464         if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1465                 error("unsupported checksum algorithm %u", csum_type);
1466                 return -EIO;
1467         }
1468         csum_size = btrfs_csum_sizes[csum_type];
1469
1470         crc = ~(u32)0;
1471         crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1472                               BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1473         btrfs_csum_final(crc, result);
1474
1475         if (memcmp(result, sb->csum, csum_size)) {
1476                 error("superblock checksum mismatch");
1477                 return -EIO;
1478         }
1479         if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1480                 error("tree_root level too big: %d >= %d",
1481                         btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1482                 goto error_out;
1483         }
1484         if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1485                 error("chunk_root level too big: %d >= %d",
1486                         btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1487                 goto error_out;
1488         }
1489         if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1490                 error("log_root level too big: %d >= %d",
1491                         btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1492                 goto error_out;
1493         }
1494
1495         if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1496                 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1497                 goto error_out;
1498         }
1499         if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1500                 error("chunk_root block unaligned: %llu",
1501                         btrfs_super_chunk_root(sb));
1502                 goto error_out;
1503         }
1504         if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1505                 error("log_root block unaligned: %llu",
1506                         btrfs_super_log_root(sb));
1507                 goto error_out;
1508         }
1509         if (btrfs_super_nodesize(sb) < 4096) {
1510                 error("nodesize too small: %u < 4096",
1511                         btrfs_super_nodesize(sb));
1512                 goto error_out;
1513         }
1514         if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1515                 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1516                 goto error_out;
1517         }
1518         if (btrfs_super_sectorsize(sb) < 4096) {
1519                 error("sectorsize too small: %u < 4096",
1520                         btrfs_super_sectorsize(sb));
1521                 goto error_out;
1522         }
1523         if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1524                 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1525                 goto error_out;
1526         }
1527         if (btrfs_super_total_bytes(sb) == 0) {
1528                 error("invalid total_bytes 0");
1529                 goto error_out;
1530         }
1531         if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1532                 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1533                 goto error_out;
1534         }
1535         if ((btrfs_super_stripesize(sb) != 4096)
1536                 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1537                 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1538                 goto error_out;
1539         }
1540
1541         if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1542                 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1543                 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1544
1545                 uuid_unparse(sb->fsid, fsid);
1546                 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1547                 error("dev_item UUID does not match fsid: %s != %s",
1548                         dev_fsid, fsid);
1549                 goto error_out;
1550         }
1551
1552         /*
1553          * Hint to catch really bogus numbers, bitflips or so
1554          */
1555         if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1556                 warning("suspicious number of devices: %llu",
1557                         btrfs_super_num_devices(sb));
1558         }
1559
1560         if (btrfs_super_num_devices(sb) == 0) {
1561                 error("number of devices is 0");
1562                 goto error_out;
1563         }
1564
1565         /*
1566          * Obvious sys_chunk_array corruptions, it must hold at least one key
1567          * and one chunk
1568          */
1569         if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1570                 error("system chunk array too big %u > %u",
1571                       btrfs_super_sys_array_size(sb),
1572                       BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1573                 goto error_out;
1574         }
1575         if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1576                         + sizeof(struct btrfs_chunk)) {
1577                 error("system chunk array too small %u < %zu",
1578                       btrfs_super_sys_array_size(sb),
1579                       sizeof(struct btrfs_disk_key) +
1580                       sizeof(struct btrfs_chunk));
1581                 goto error_out;
1582         }
1583
1584         return 0;
1585
1586 error_out:
1587         error("superblock checksum matches but it has invalid members");
1588         return -EIO;
1589 }
1590
1591 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1592                          unsigned sbflags)
1593 {
1594         u8 fsid[BTRFS_FSID_SIZE];
1595         int fsid_is_initialized = 0;
1596         char tmp[BTRFS_SUPER_INFO_SIZE];
1597         struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1598         int i;
1599         int ret;
1600         int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1601         u64 transid = 0;
1602         u64 bytenr;
1603
1604         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1605                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1606                 /* real error */
1607                 if (ret < 0)
1608                         return -errno;
1609
1610                 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1611                 if (ret < BTRFS_SUPER_INFO_SIZE)
1612                         return -ENOENT;
1613
1614                 if (btrfs_super_bytenr(buf) != sb_bytenr)
1615                         return -EIO;
1616
1617                 ret = check_super(buf, sbflags);
1618                 if (ret < 0)
1619                         return ret;
1620                 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1621                 return 0;
1622         }
1623
1624         /*
1625         * we would like to check all the supers, but that would make
1626         * a btrfs mount succeed after a mkfs from a different FS.
1627         * So, we need to add a special mount option to scan for
1628         * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1629         */
1630
1631         for (i = 0; i < max_super; i++) {
1632                 bytenr = btrfs_sb_offset(i);
1633                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1634                 if (ret < BTRFS_SUPER_INFO_SIZE)
1635                         break;
1636
1637                 if (btrfs_super_bytenr(buf) != bytenr )
1638                         continue;
1639                 /* if magic is NULL, the device was removed */
1640                 if (btrfs_super_magic(buf) == 0 && i == 0)
1641                         break;
1642                 if (check_super(buf, sbflags))
1643                         continue;
1644
1645                 if (!fsid_is_initialized) {
1646                         memcpy(fsid, buf->fsid, sizeof(fsid));
1647                         fsid_is_initialized = 1;
1648                 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1649                         /*
1650                          * the superblocks (the original one and
1651                          * its backups) contain data of different
1652                          * filesystems -> the super cannot be trusted
1653                          */
1654                         continue;
1655                 }
1656
1657                 if (btrfs_super_generation(buf) > transid) {
1658                         memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1659                         transid = btrfs_super_generation(buf);
1660                 }
1661         }
1662
1663         return transid > 0 ? 0 : -1;
1664 }
1665
1666 static int write_dev_supers(struct btrfs_root *root,
1667                             struct btrfs_super_block *sb,
1668                             struct btrfs_device *device)
1669 {
1670         u64 bytenr;
1671         u32 crc;
1672         int i, ret;
1673
1674         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1675                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1676                 crc = ~(u32)0;
1677                 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1678                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1679                 btrfs_csum_final(crc, &sb->csum[0]);
1680
1681                 /*
1682                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1683                  * zero filled, we can use it directly
1684                  */
1685                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1686                                 BTRFS_SUPER_INFO_SIZE,
1687                                 root->fs_info->super_bytenr);
1688                 if (ret != BTRFS_SUPER_INFO_SIZE)
1689                         goto write_err;
1690                 return 0;
1691         }
1692
1693         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1694                 bytenr = btrfs_sb_offset(i);
1695                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1696                         break;
1697
1698                 btrfs_set_super_bytenr(sb, bytenr);
1699
1700                 crc = ~(u32)0;
1701                 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1702                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1703                 btrfs_csum_final(crc, &sb->csum[0]);
1704
1705                 /*
1706                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1707                  * zero filled, we can use it directly
1708                  */
1709                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1710                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1711                 if (ret != BTRFS_SUPER_INFO_SIZE)
1712                         goto write_err;
1713         }
1714
1715         return 0;
1716
1717 write_err:
1718         if (ret > 0)
1719                 fprintf(stderr, "WARNING: failed to write all sb data\n");
1720         else
1721                 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1722                         strerror(errno));
1723         return ret;
1724 }
1725
1726 int write_all_supers(struct btrfs_root *root)
1727 {
1728         struct list_head *cur;
1729         struct list_head *head = &root->fs_info->fs_devices->devices;
1730         struct btrfs_device *dev;
1731         struct btrfs_super_block *sb;
1732         struct btrfs_dev_item *dev_item;
1733         int ret;
1734         u64 flags;
1735
1736         sb = root->fs_info->super_copy;
1737         dev_item = &sb->dev_item;
1738         list_for_each(cur, head) {
1739                 dev = list_entry(cur, struct btrfs_device, dev_list);
1740                 if (!dev->writeable)
1741                         continue;
1742
1743                 btrfs_set_stack_device_generation(dev_item, 0);
1744                 btrfs_set_stack_device_type(dev_item, dev->type);
1745                 btrfs_set_stack_device_id(dev_item, dev->devid);
1746                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1747                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1748                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1749                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1750                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1751                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1752                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1753
1754                 flags = btrfs_super_flags(sb);
1755                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1756
1757                 ret = write_dev_supers(root, sb, dev);
1758                 BUG_ON(ret);
1759         }
1760         return 0;
1761 }
1762
1763 int write_ctree_super(struct btrfs_trans_handle *trans,
1764                       struct btrfs_root *root)
1765 {
1766         int ret;
1767         struct btrfs_root *tree_root = root->fs_info->tree_root;
1768         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1769
1770         if (root->fs_info->readonly)
1771                 return 0;
1772
1773         btrfs_set_super_generation(root->fs_info->super_copy,
1774                                    trans->transid);
1775         btrfs_set_super_root(root->fs_info->super_copy,
1776                              tree_root->node->start);
1777         btrfs_set_super_root_level(root->fs_info->super_copy,
1778                                    btrfs_header_level(tree_root->node));
1779         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1780                                    chunk_root->node->start);
1781         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1782                                          btrfs_header_level(chunk_root->node));
1783         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1784                                 btrfs_header_generation(chunk_root->node));
1785
1786         ret = write_all_supers(root);
1787         if (ret)
1788                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1789         return ret;
1790 }
1791
1792 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1793 {
1794         int ret;
1795         struct btrfs_trans_handle *trans;
1796         struct btrfs_root *root = fs_info->tree_root;
1797
1798         if (fs_info->last_trans_committed !=
1799             fs_info->generation) {
1800                 BUG_ON(!root);
1801                 trans = btrfs_start_transaction(root, 1);
1802                 btrfs_commit_transaction(trans, root);
1803                 trans = btrfs_start_transaction(root, 1);
1804                 ret = commit_tree_roots(trans, fs_info);
1805                 BUG_ON(ret);
1806                 ret = __commit_transaction(trans, root);
1807                 BUG_ON(ret);
1808                 write_ctree_super(trans, root);
1809                 kfree(trans);
1810         }
1811
1812         if (fs_info->finalize_on_close) {
1813                 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1814                 root->fs_info->finalize_on_close = 0;
1815                 ret = write_all_supers(root);
1816                 if (ret)
1817                         fprintf(stderr,
1818                                 "failed to write new super block err %d\n", ret);
1819         }
1820         btrfs_free_block_groups(fs_info);
1821
1822         free_fs_roots_tree(&fs_info->fs_root_tree);
1823
1824         btrfs_release_all_roots(fs_info);
1825         ret = btrfs_close_devices(fs_info->fs_devices);
1826         btrfs_cleanup_all_caches(fs_info);
1827         btrfs_free_fs_info(fs_info);
1828         return ret;
1829 }
1830
1831 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1832                      struct extent_buffer *eb)
1833 {
1834         return clear_extent_buffer_dirty(eb);
1835 }
1836
1837 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1838 {
1839         set_extent_buffer_dirty(eb);
1840 }
1841
1842 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1843 {
1844         int ret;
1845
1846         ret = extent_buffer_uptodate(buf);
1847         if (!ret)
1848                 return ret;
1849
1850         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1851         return !ret;
1852 }
1853
1854 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1855 {
1856         return set_extent_buffer_uptodate(eb);
1857 }