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(struct btrfs_root *root, 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)(64 * 1024));
 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_trans_handle *trans,
 430                      struct btrfs_root *root,
 431                      struct extent_buffer *eb)
 432 {
 433         int ret;
 434         int dev_nr;
 435         u64 length;
 436         u64 *raid_map = NULL;
 437         struct btrfs_multi_bio *multi = NULL;
 438
 439         dev_nr = 0;
 440         length = eb->len;
 441         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 442                               eb->start, &length, &multi, 0, &raid_map);
 443
 444         if (raid_map) {
 445                 ret = write_raid56_with_parity(root->fs_info, eb, multi,
 446                                                length, raid_map);
 447                 BUG_ON(ret);
 448         } else while (dev_nr < multi->num_stripes) {
 449                 BUG_ON(ret);
 450                 eb->fd = multi->stripes[dev_nr].dev->fd;
 451                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 452                 multi->stripes[dev_nr].dev->total_ios++;
 453                 dev_nr++;
 454                 ret = write_extent_to_disk(eb);
 455                 BUG_ON(ret);
 456         }
 457         kfree(raid_map);
 458         kfree(multi);
 459         return 0;
 460 }
 461
 462 int write_tree_block(struct btrfs_trans_handle *trans,
 463                      struct btrfs_root *root,
 464                      struct extent_buffer *eb)
 465 {
 466         if (check_tree_block(root->fs_info, eb)) {
 467                 print_tree_block_error(root->fs_info, eb,
 468                                 check_tree_block(root->fs_info, eb));
 469                 BUG();
 470         }
 471
 472         if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
 473                 BUG();
 474
 475         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 476         csum_tree_block(root, eb, 0);
 477
 478         return write_and_map_eb(trans, root, eb);
 479 }
 480
 481 void btrfs_setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 482                         u32 stripesize, struct btrfs_root *root,
 483                         struct btrfs_fs_info *fs_info, u64 objectid)
 484 {
 485         root->node = NULL;
 486         root->commit_root = NULL;
 487         root->sectorsize = sectorsize;
 488         root->nodesize = nodesize;
 489         root->leafsize = leafsize;
 490         root->stripesize = stripesize;
 491         root->ref_cows = 0;
 492         root->track_dirty = 0;
 493
 494         root->fs_info = fs_info;
 495         root->objectid = objectid;
 496         root->last_trans = 0;
 497         root->highest_inode = 0;
 498         root->last_inode_alloc = 0;
 499
 500         INIT_LIST_HEAD(&root->dirty_list);
 501         INIT_LIST_HEAD(&root->orphan_data_extents);
 502         memset(&root->root_key, 0, sizeof(root->root_key));
 503         memset(&root->root_item, 0, sizeof(root->root_item));
 504         root->root_key.objectid = objectid;
 505 }
 506
 507 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 508                                struct btrfs_root *root)
 509 {
 510         int ret;
 511         u64 old_root_bytenr;
 512         struct btrfs_root *tree_root = root->fs_info->tree_root;
 513
 514         btrfs_write_dirty_block_groups(trans, root);
 515         while(1) {
 516                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 517                 if (old_root_bytenr == root->node->start)
 518                         break;
 519                 btrfs_set_root_bytenr(&root->root_item,
 520                                        root->node->start);
 521                 btrfs_set_root_generation(&root->root_item,
 522                                           trans->transid);
 523                 root->root_item.level = btrfs_header_level(root->node);
 524                 ret = btrfs_update_root(trans, tree_root,
 525                                         &root->root_key,
 526                                         &root->root_item);
 527                 BUG_ON(ret);
 528                 btrfs_write_dirty_block_groups(trans, root);
 529         }
 530         return 0;
 531 }
 532
 533 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 534                              struct btrfs_fs_info *fs_info)
 535 {
 536         struct btrfs_root *root;
 537         struct list_head *next;
 538         struct extent_buffer *eb;
 539         int ret;
 540
 541         if (fs_info->readonly)
 542                 return 0;
 543
 544         eb = fs_info->tree_root->node;
 545         extent_buffer_get(eb);
 546         ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 547         free_extent_buffer(eb);
 548         if (ret)
 549                 return ret;
 550
 551         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 552                 next = fs_info->dirty_cowonly_roots.next;
 553                 list_del_init(next);
 554                 root = list_entry(next, struct btrfs_root, dirty_list);
 555                 update_cowonly_root(trans, root);
 556                 free_extent_buffer(root->commit_root);
 557                 root->commit_root = NULL;
 558         }
 559
 560         return 0;
 561 }
 562
 563 static int __commit_transaction(struct btrfs_trans_handle *trans,
 564                                 struct btrfs_root *root)
 565 {
 566         u64 start;
 567         u64 end;
 568         struct extent_buffer *eb;
 569         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 570         int ret;
 571
 572         while(1) {
 573                 ret = find_first_extent_bit(tree, 0, &start, &end,
 574                                             EXTENT_DIRTY);
 575                 if (ret)
 576                         break;
 577                 while(start <= end) {
 578                         eb = find_first_extent_buffer(tree, start);
 579                         BUG_ON(!eb || eb->start != start);
 580                         ret = write_tree_block(trans, root, eb);
 581                         BUG_ON(ret);
 582                         start += eb->len;
 583                         clear_extent_buffer_dirty(eb);
 584                         free_extent_buffer(eb);
 585                 }
 586         }
 587         return 0;
 588 }
 589
 590 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 591                              struct btrfs_root *root)
 592 {
 593         u64 transid = trans->transid;
 594         int ret = 0;
 595         struct btrfs_fs_info *fs_info = root->fs_info;
 596
 597         if (root->commit_root == root->node)
 598                 goto commit_tree;
 599         if (root == root->fs_info->tree_root)
 600                 goto commit_tree;
 601         if (root == root->fs_info->chunk_root)
 602                 goto commit_tree;
 603
 604         free_extent_buffer(root->commit_root);
 605         root->commit_root = NULL;
 606
 607         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 608         btrfs_set_root_generation(&root->root_item, trans->transid);
 609         root->root_item.level = btrfs_header_level(root->node);
 610         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 611                                 &root->root_key, &root->root_item);
 612         BUG_ON(ret);
 613 commit_tree:
 614         ret = commit_tree_roots(trans, fs_info);
 615         BUG_ON(ret);
 616         ret = __commit_transaction(trans, root);
 617         BUG_ON(ret);
 618         write_ctree_super(trans, root);
 619         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 620                                    &fs_info->pinned_extents);
 621         btrfs_free_transaction(root, trans);
 622         free_extent_buffer(root->commit_root);
 623         root->commit_root = NULL;
 624         fs_info->running_transaction = NULL;
 625         fs_info->last_trans_committed = transid;
 626         return 0;
 627 }
 628
 629 static int find_and_setup_root(struct btrfs_root *tree_root,
 630                                struct btrfs_fs_info *fs_info,
 631                                u64 objectid, struct btrfs_root *root)
 632 {
 633         int ret;
 634         u32 blocksize;
 635         u64 generation;
 636
 637         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 638                      tree_root->sectorsize, tree_root->stripesize,
 639                      root, fs_info, objectid);
 640         ret = btrfs_find_last_root(tree_root, objectid,
 641                                    &root->root_item, &root->root_key);
 642         if (ret)
 643                 return ret;
 644
 645         blocksize = root->nodesize;
 646         generation = btrfs_root_generation(&root->root_item);
 647         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 648                                      blocksize, generation);
 649         if (!extent_buffer_uptodate(root->node))
 650                 return -EIO;
 651
 652         return 0;
 653 }
 654
 655 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 656                                struct btrfs_fs_info *fs_info,
 657                                struct btrfs_super_block *disk_super)
 658 {
 659         u32 blocksize;
 660         u64 blocknr = btrfs_super_log_root(disk_super);
 661         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 662
 663         if (!log_root)
 664                 return -ENOMEM;
 665
 666         if (blocknr == 0) {
 667                 free(log_root);
 668                 return 0;
 669         }
 670
 671         blocksize = tree_root->nodesize;
 672
 673         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 674                      tree_root->sectorsize, tree_root->stripesize,
 675                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 676
 677         log_root->node = read_tree_block(tree_root, blocknr,
 678                                      blocksize,
 679                                      btrfs_super_generation(disk_super) + 1);
 680
 681         fs_info->log_root_tree = log_root;
 682
 683         if (!extent_buffer_uptodate(log_root->node)) {
 684                 free_extent_buffer(log_root->node);
 685                 free(log_root);
 686                 fs_info->log_root_tree = NULL;
 687                 return -EIO;
 688         }
 689
 690         return 0;
 691 }
 692
 693 int btrfs_free_fs_root(struct btrfs_root *root)
 694 {
 695         if (root->node)
 696                 free_extent_buffer(root->node);
 697         if (root->commit_root)
 698                 free_extent_buffer(root->commit_root);
 699         kfree(root);
 700         return 0;
 701 }
 702
 703 static void __free_fs_root(struct rb_node *node)
 704 {
 705         struct btrfs_root *root;
 706
 707         root = container_of(node, struct btrfs_root, rb_node);
 708         btrfs_free_fs_root(root);
 709 }
 710
 711 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
 712
 713 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 714                                                struct btrfs_key *location)
 715 {
 716         struct btrfs_root *root;
 717         struct btrfs_root *tree_root = fs_info->tree_root;
 718         struct btrfs_path *path;
 719         struct extent_buffer *l;
 720         u64 generation;
 721         u32 blocksize;
 722         int ret = 0;
 723
 724         root = calloc(1, sizeof(*root));
 725         if (!root)
 726                 return ERR_PTR(-ENOMEM);
 727         if (location->offset == (u64)-1) {
 728                 ret = find_and_setup_root(tree_root, fs_info,
 729                                           location->objectid, root);
 730                 if (ret) {
 731                         free(root);
 732                         return ERR_PTR(ret);
 733                 }
 734                 goto insert;
 735         }
 736
 737         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 738                      tree_root->sectorsize, tree_root->stripesize,
 739                      root, fs_info, location->objectid);
 740
 741         path = btrfs_alloc_path();
 742         if (!path) {
 743                 free(root);
 744                 return ERR_PTR(-ENOMEM);
 745         }
 746
 747         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 748         if (ret != 0) {
 749                 if (ret > 0)
 750                         ret = -ENOENT;
 751                 goto out;
 752         }
 753         l = path->nodes[0];
 754         read_extent_buffer(l, &root->root_item,
 755                btrfs_item_ptr_offset(l, path->slots[0]),
 756                sizeof(root->root_item));
 757         memcpy(&root->root_key, location, sizeof(*location));
 758         ret = 0;
 759 out:
 760         btrfs_free_path(path);
 761         if (ret) {
 762                 free(root);
 763                 return ERR_PTR(ret);
 764         }
 765         generation = btrfs_root_generation(&root->root_item);
 766         blocksize = root->nodesize;
 767         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 768                                      blocksize, generation);
 769         if (!extent_buffer_uptodate(root->node)) {
 770                 free(root);
 771                 return ERR_PTR(-EIO);
 772         }
 773 insert:
 774         root->ref_cows = 1;
 775         return root;
 776 }
 777
 778 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
 779                                             void *data)
 780 {
 781         u64 objectid = *((u64 *)data);
 782         struct btrfs_root *root;
 783
 784         root = rb_entry(node, struct btrfs_root, rb_node);
 785         if (objectid > root->objectid)
 786                 return 1;
 787         else if (objectid < root->objectid)
 788                 return -1;
 789         else
 790                 return 0;
 791 }
 792
 793 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
 794                                         struct rb_node *node2)
 795 {
 796         struct btrfs_root *root;
 797
 798         root = rb_entry(node2, struct btrfs_root, rb_node);
 799         return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
 800 }
 801
 802 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 803                                       struct btrfs_key *location)
 804 {
 805         struct btrfs_root *root;
 806         struct rb_node *node;
 807         int ret;
 808         u64 objectid = location->objectid;
 809
 810         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 811                 return fs_info->tree_root;
 812         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 813                 return fs_info->extent_root;
 814         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 815                 return fs_info->chunk_root;
 816         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 817                 return fs_info->dev_root;
 818         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 819                 return fs_info->csum_root;
 820         if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
 821                 return fs_info->quota_root;
 822
 823         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 824                location->offset != (u64)-1);
 825
 826         node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
 827                          btrfs_fs_roots_compare_objectids, NULL);
 828         if (node)
 829                 return container_of(node, struct btrfs_root, rb_node);
 830
 831         root = btrfs_read_fs_root_no_cache(fs_info, location);
 832         if (IS_ERR(root))
 833                 return root;
 834
 835         ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
 836                         btrfs_fs_roots_compare_roots);
 837         BUG_ON(ret);
 838         return root;
 839 }
 840
 841 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 842 {
 843         free(fs_info->tree_root);
 844         free(fs_info->extent_root);
 845         free(fs_info->chunk_root);
 846         free(fs_info->dev_root);
 847         free(fs_info->csum_root);
 848         free(fs_info->quota_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 == 0)
1064                 fs_info->quota_enabled = 1;
1065
1066         if (btrfs_fs_compat_ro(fs_info, BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE)) {
1067                 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1068                                           fs_info->free_space_root);
1069                 if (ret) {
1070                         printk("Couldn't read free space tree\n");
1071                         return -EIO;
1072                 }
1073                 fs_info->free_space_root->track_dirty = 1;
1074         }
1075
1076         ret = find_and_setup_log_root(root, fs_info, sb);
1077         if (ret) {
1078                 printk("Couldn't setup log root tree\n");
1079                 if (!(flags & OPEN_CTREE_PARTIAL))
1080                         return -EIO;
1081         }
1082
1083         fs_info->generation = generation;
1084         fs_info->last_trans_committed = generation;
1085         if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1086             !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1087                 btrfs_read_block_groups(fs_info->tree_root);
1088
1089         key.objectid = BTRFS_FS_TREE_OBJECTID;
1090         key.type = BTRFS_ROOT_ITEM_KEY;
1091         key.offset = (u64)-1;
1092         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1093
1094         if (IS_ERR(fs_info->fs_root))
1095                 return -EIO;
1096         return 0;
1097 }
1098
1099 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1100 {
1101         if (fs_info->free_space_root)
1102                 free_extent_buffer(fs_info->free_space_root->node);
1103         if (fs_info->quota_root)
1104                 free_extent_buffer(fs_info->quota_root->node);
1105         if (fs_info->csum_root)
1106                 free_extent_buffer(fs_info->csum_root->node);
1107         if (fs_info->dev_root)
1108                 free_extent_buffer(fs_info->dev_root->node);
1109         if (fs_info->extent_root)
1110                 free_extent_buffer(fs_info->extent_root->node);
1111         if (fs_info->tree_root)
1112                 free_extent_buffer(fs_info->tree_root->node);
1113         if (fs_info->log_root_tree)
1114                 free_extent_buffer(fs_info->log_root_tree->node);
1115         if (fs_info->chunk_root)
1116                 free_extent_buffer(fs_info->chunk_root->node);
1117 }
1118
1119 static void free_map_lookup(struct cache_extent *ce)
1120 {
1121         struct map_lookup *map;
1122
1123         map = container_of(ce, struct map_lookup, ce);
1124         kfree(map);
1125 }
1126
1127 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1128
1129 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1130 {
1131         while (!list_empty(&fs_info->recow_ebs)) {
1132                 struct extent_buffer *eb;
1133                 eb = list_first_entry(&fs_info->recow_ebs,
1134                                       struct extent_buffer, recow);
1135                 list_del_init(&eb->recow);
1136                 free_extent_buffer(eb);
1137         }
1138         free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1139         extent_io_tree_cleanup(&fs_info->extent_cache);
1140         extent_io_tree_cleanup(&fs_info->free_space_cache);
1141         extent_io_tree_cleanup(&fs_info->block_group_cache);
1142         extent_io_tree_cleanup(&fs_info->pinned_extents);
1143         extent_io_tree_cleanup(&fs_info->pending_del);
1144         extent_io_tree_cleanup(&fs_info->extent_ins);
1145 }
1146
1147 int btrfs_scan_fs_devices(int fd, const char *path,
1148                           struct btrfs_fs_devices **fs_devices,
1149                           u64 sb_bytenr, unsigned sbflags,
1150                           int skip_devices)
1151 {
1152         u64 total_devs;
1153         u64 dev_size;
1154         off_t seek_ret;
1155         int ret;
1156         if (!sb_bytenr)
1157                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1158
1159         seek_ret = lseek(fd, 0, SEEK_END);
1160         if (seek_ret < 0)
1161                 return -errno;
1162
1163         dev_size = seek_ret;
1164         lseek(fd, 0, SEEK_SET);
1165         if (sb_bytenr > dev_size) {
1166                 error("superblock bytenr %llu is larger than device size %llu",
1167                                 (unsigned long long)sb_bytenr,
1168                                 (unsigned long long)dev_size);
1169                 return -EINVAL;
1170         }
1171
1172         ret = btrfs_scan_one_device(fd, path, fs_devices,
1173                                     &total_devs, sb_bytenr, sbflags);
1174         if (ret) {
1175                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1176                 return ret;
1177         }
1178
1179         if (!skip_devices && total_devs != 1) {
1180                 ret = btrfs_scan_devices();
1181                 if (ret)
1182                         return ret;
1183         }
1184         return 0;
1185 }
1186
1187 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1188                                           u64 chunk_root_bytenr)
1189 {
1190         struct btrfs_super_block *sb = fs_info->super_copy;
1191         u32 sectorsize;
1192         u32 nodesize;
1193         u32 leafsize;
1194         u32 blocksize;
1195         u32 stripesize;
1196         u64 generation;
1197         int ret;
1198
1199         nodesize = btrfs_super_nodesize(sb);
1200         leafsize = btrfs_super_leafsize(sb);
1201         sectorsize = btrfs_super_sectorsize(sb);
1202         stripesize = btrfs_super_stripesize(sb);
1203
1204         btrfs_setup_root(nodesize, leafsize, sectorsize, stripesize,
1205                      fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1206
1207         ret = btrfs_read_sys_array(fs_info->chunk_root);
1208         if (ret)
1209                 return ret;
1210
1211         blocksize = fs_info->chunk_root->nodesize;
1212         generation = btrfs_super_chunk_root_generation(sb);
1213
1214         if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1215                                             btrfs_super_sectorsize(sb))) {
1216                 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1217                         chunk_root_bytenr, btrfs_super_sectorsize(sb));
1218                 chunk_root_bytenr = 0;
1219         }
1220
1221         if (!chunk_root_bytenr)
1222                 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1223         else
1224                 generation = 0;
1225
1226         fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
1227                                                     chunk_root_bytenr,
1228                                                     blocksize, generation);
1229         if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1230                 if (fs_info->ignore_chunk_tree_error) {
1231                         warning("cannot read chunk root, continue anyway");
1232                         fs_info->chunk_root = NULL;
1233                         return 0;
1234                 } else {
1235                         error("cannot read chunk root");
1236                         return -EIO;
1237                 }
1238         }
1239
1240         if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1241                 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1242                 if (ret) {
1243                         fprintf(stderr, "Couldn't read chunk tree\n");
1244                         return ret;
1245                 }
1246         }
1247         return 0;
1248 }
1249
1250 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1251                                              u64 sb_bytenr,
1252                                              u64 root_tree_bytenr,
1253                                              u64 chunk_root_bytenr,
1254                                              unsigned flags)
1255 {
1256         struct btrfs_fs_info *fs_info;
1257         struct btrfs_super_block *disk_super;
1258         struct btrfs_fs_devices *fs_devices = NULL;
1259         struct extent_buffer *eb;
1260         int ret;
1261         int oflags;
1262         unsigned sbflags = SBREAD_DEFAULT;
1263
1264         if (sb_bytenr == 0)
1265                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1266
1267         /* try to drop all the caches */
1268         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1269                 fprintf(stderr, "Warning, could not drop caches\n");
1270
1271         fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1272         if (!fs_info) {
1273                 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1274                 return NULL;
1275         }
1276         if (flags & OPEN_CTREE_RESTORE)
1277                 fs_info->on_restoring = 1;
1278         if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1279                 fs_info->suppress_check_block_errors = 1;
1280         if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1281                 fs_info->ignore_fsid_mismatch = 1;
1282         if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1283                 fs_info->ignore_chunk_tree_error = 1;
1284
1285         if ((flags & OPEN_CTREE_RECOVER_SUPER)
1286              && (flags & OPEN_CTREE_FS_PARTIAL)) {
1287                 fprintf(stderr,
1288                     "cannot open a partially created filesystem for recovery");
1289                 goto out;
1290         }
1291
1292         if (flags & OPEN_CTREE_FS_PARTIAL)
1293                 sbflags = SBREAD_PARTIAL;
1294
1295         ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1296                         (flags & OPEN_CTREE_NO_DEVICES));
1297         if (ret)
1298                 goto out;
1299
1300         fs_info->fs_devices = fs_devices;
1301         if (flags & OPEN_CTREE_WRITES)
1302                 oflags = O_RDWR;
1303         else
1304                 oflags = O_RDONLY;
1305
1306         if (flags & OPEN_CTREE_EXCLUSIVE)
1307                 oflags |= O_EXCL;
1308
1309         ret = btrfs_open_devices(fs_devices, oflags);
1310         if (ret)
1311                 goto out;
1312
1313         disk_super = fs_info->super_copy;
1314         if (flags & OPEN_CTREE_RECOVER_SUPER)
1315                 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1316                                 sb_bytenr, SBREAD_RECOVER);
1317         else
1318                 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1319                                 sbflags);
1320         if (ret) {
1321                 printk("No valid btrfs found\n");
1322                 goto out_devices;
1323         }
1324
1325         if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1326             !fs_info->ignore_fsid_mismatch) {
1327                 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1328                 goto out_devices;
1329         }
1330
1331         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1332
1333         ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
1334         if (ret)
1335                 goto out_devices;
1336
1337         ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1338         if (ret)
1339                 goto out_chunk;
1340
1341         /* Chunk tree root is unable to read, return directly */
1342         if (!fs_info->chunk_root)
1343                 return fs_info;
1344
1345         eb = fs_info->chunk_root->node;
1346         read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1347                            btrfs_header_chunk_tree_uuid(eb),
1348                            BTRFS_UUID_SIZE);
1349
1350         ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1351         if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1352             !fs_info->ignore_chunk_tree_error)
1353                 goto out_chunk;
1354
1355         return fs_info;
1356
1357 out_chunk:
1358         btrfs_release_all_roots(fs_info);
1359         btrfs_cleanup_all_caches(fs_info);
1360 out_devices:
1361         btrfs_close_devices(fs_devices);
1362 out:
1363         btrfs_free_fs_info(fs_info);
1364         return NULL;
1365 }
1366
1367 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1368                                          u64 sb_bytenr, u64 root_tree_bytenr,
1369                                          u64 chunk_root_bytenr,
1370                                          unsigned flags)
1371 {
1372         int fp;
1373         int ret;
1374         struct btrfs_fs_info *info;
1375         int oflags = O_RDWR;
1376         struct stat st;
1377
1378         ret = stat(filename, &st);
1379         if (ret < 0) {
1380                 error("cannot stat '%s': %s", filename, strerror(errno));
1381                 return NULL;
1382         }
1383         if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1384                 error("not a regular file or block device: %s", filename);
1385                 return NULL;
1386         }
1387
1388         if (!(flags & OPEN_CTREE_WRITES))
1389                 oflags = O_RDONLY;
1390
1391         fp = open(filename, oflags);
1392         if (fp < 0) {
1393                 error("cannot open '%s': %s", filename, strerror(errno));
1394                 return NULL;
1395         }
1396         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1397                                chunk_root_bytenr, flags);
1398         close(fp);
1399         return info;
1400 }
1401
1402 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1403                               unsigned flags)
1404 {
1405         struct btrfs_fs_info *info;
1406
1407         /* This flags may not return fs_info with any valid root */
1408         BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1409         info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1410         if (!info)
1411                 return NULL;
1412         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1413                 return info->chunk_root;
1414         return info->fs_root;
1415 }
1416
1417 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1418                                  unsigned flags)
1419 {
1420         struct btrfs_fs_info *info;
1421
1422         /* This flags may not return fs_info with any valid root */
1423         if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
1424                 error("invalid open_ctree flags: 0x%llx",
1425                                 (unsigned long long)flags);
1426                 return NULL;
1427         }
1428         info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1429         if (!info)
1430                 return NULL;
1431         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1432                 return info->chunk_root;
1433         return info->fs_root;
1434 }
1435
1436 /*
1437  * Check if the super is valid:
1438  * - nodesize/sectorsize - minimum, maximum, alignment
1439  * - tree block starts   - alignment
1440  * - number of devices   - something sane
1441  * - sys array size      - maximum
1442  */
1443 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1444 {
1445         u8 result[BTRFS_CSUM_SIZE];
1446         u32 crc;
1447         u16 csum_type;
1448         int csum_size;
1449
1450         if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1451                 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1452                         if (!(sbflags & SBREAD_PARTIAL)) {
1453                                 error("superblock magic doesn't match");
1454                                 return -EIO;
1455                         }
1456                 }
1457         }
1458
1459         csum_type = btrfs_super_csum_type(sb);
1460         if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1461                 error("unsupported checksum algorithm %u", csum_type);
1462                 return -EIO;
1463         }
1464         csum_size = btrfs_csum_sizes[csum_type];
1465
1466         crc = ~(u32)0;
1467         crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1468                               BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1469         btrfs_csum_final(crc, result);
1470
1471         if (memcmp(result, sb->csum, csum_size)) {
1472                 error("superblock checksum mismatch");
1473                 return -EIO;
1474         }
1475         if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1476                 error("tree_root level too big: %d >= %d",
1477                         btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1478                 goto error_out;
1479         }
1480         if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1481                 error("chunk_root level too big: %d >= %d",
1482                         btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1483                 goto error_out;
1484         }
1485         if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1486                 error("log_root level too big: %d >= %d",
1487                         btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1488                 goto error_out;
1489         }
1490
1491         if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1492                 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1493                 goto error_out;
1494         }
1495         if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1496                 error("chunk_root block unaligned: %llu",
1497                         btrfs_super_chunk_root(sb));
1498                 goto error_out;
1499         }
1500         if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1501                 error("log_root block unaligned: %llu",
1502                         btrfs_super_log_root(sb));
1503                 goto error_out;
1504         }
1505         if (btrfs_super_nodesize(sb) < 4096) {
1506                 error("nodesize too small: %u < 4096",
1507                         btrfs_super_nodesize(sb));
1508                 goto error_out;
1509         }
1510         if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1511                 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1512                 goto error_out;
1513         }
1514         if (btrfs_super_sectorsize(sb) < 4096) {
1515                 error("sectorsize too small: %u < 4096",
1516                         btrfs_super_sectorsize(sb));
1517                 goto error_out;
1518         }
1519         if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1520                 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1521                 goto error_out;
1522         }
1523         if (btrfs_super_total_bytes(sb) == 0) {
1524                 error("invalid total_bytes 0");
1525                 goto error_out;
1526         }
1527         if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1528                 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1529                 goto error_out;
1530         }
1531         if ((btrfs_super_stripesize(sb) != 4096)
1532                 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1533                 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1534                 goto error_out;
1535         }
1536
1537         if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1538                 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1539                 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1540
1541                 uuid_unparse(sb->fsid, fsid);
1542                 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1543                 error("dev_item UUID does not match fsid: %s != %s",
1544                         dev_fsid, fsid);
1545                 goto error_out;
1546         }
1547
1548         /*
1549          * Hint to catch really bogus numbers, bitflips or so
1550          */
1551         if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1552                 warning("suspicious number of devices: %llu",
1553                         btrfs_super_num_devices(sb));
1554         }
1555
1556         if (btrfs_super_num_devices(sb) == 0) {
1557                 error("number of devices is 0");
1558                 goto error_out;
1559         }
1560
1561         /*
1562          * Obvious sys_chunk_array corruptions, it must hold at least one key
1563          * and one chunk
1564          */
1565         if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1566                 error("system chunk array too big %u > %u",
1567                       btrfs_super_sys_array_size(sb),
1568                       BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1569                 goto error_out;
1570         }
1571         if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1572                         + sizeof(struct btrfs_chunk)) {
1573                 error("system chunk array too small %u < %zu",
1574                       btrfs_super_sys_array_size(sb),
1575                       sizeof(struct btrfs_disk_key) +
1576                       sizeof(struct btrfs_chunk));
1577                 goto error_out;
1578         }
1579
1580         return 0;
1581
1582 error_out:
1583         error("superblock checksum matches but it has invalid members");
1584         return -EIO;
1585 }
1586
1587 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1588                          unsigned sbflags)
1589 {
1590         u8 fsid[BTRFS_FSID_SIZE];
1591         int fsid_is_initialized = 0;
1592         char tmp[BTRFS_SUPER_INFO_SIZE];
1593         struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1594         int i;
1595         int ret;
1596         int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1597         u64 transid = 0;
1598         u64 bytenr;
1599
1600         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1601                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1602                 /* real error */
1603                 if (ret < 0)
1604                         return -errno;
1605
1606                 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1607                 if (ret < BTRFS_SUPER_INFO_SIZE)
1608                         return -ENOENT;
1609
1610                 if (btrfs_super_bytenr(buf) != sb_bytenr)
1611                         return -EIO;
1612
1613                 ret = check_super(buf, sbflags);
1614                 if (ret < 0)
1615                         return ret;
1616                 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1617                 return 0;
1618         }
1619
1620         /*
1621         * we would like to check all the supers, but that would make
1622         * a btrfs mount succeed after a mkfs from a different FS.
1623         * So, we need to add a special mount option to scan for
1624         * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1625         */
1626
1627         for (i = 0; i < max_super; i++) {
1628                 bytenr = btrfs_sb_offset(i);
1629                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1630                 if (ret < BTRFS_SUPER_INFO_SIZE)
1631                         break;
1632
1633                 if (btrfs_super_bytenr(buf) != bytenr )
1634                         continue;
1635                 /* if magic is NULL, the device was removed */
1636                 if (btrfs_super_magic(buf) == 0 && i == 0)
1637                         break;
1638                 if (check_super(buf, sbflags))
1639                         continue;
1640
1641                 if (!fsid_is_initialized) {
1642                         memcpy(fsid, buf->fsid, sizeof(fsid));
1643                         fsid_is_initialized = 1;
1644                 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1645                         /*
1646                          * the superblocks (the original one and
1647                          * its backups) contain data of different
1648                          * filesystems -> the super cannot be trusted
1649                          */
1650                         continue;
1651                 }
1652
1653                 if (btrfs_super_generation(buf) > transid) {
1654                         memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1655                         transid = btrfs_super_generation(buf);
1656                 }
1657         }
1658
1659         return transid > 0 ? 0 : -1;
1660 }
1661
1662 static int write_dev_supers(struct btrfs_root *root,
1663                             struct btrfs_super_block *sb,
1664                             struct btrfs_device *device)
1665 {
1666         u64 bytenr;
1667         u32 crc;
1668         int i, ret;
1669
1670         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1671                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1672                 crc = ~(u32)0;
1673                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1674                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1675                 btrfs_csum_final(crc, &sb->csum[0]);
1676
1677                 /*
1678                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1679                  * zero filled, we can use it directly
1680                  */
1681                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1682                                 BTRFS_SUPER_INFO_SIZE,
1683                                 root->fs_info->super_bytenr);
1684                 if (ret != BTRFS_SUPER_INFO_SIZE)
1685                         goto write_err;
1686                 return 0;
1687         }
1688
1689         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1690                 bytenr = btrfs_sb_offset(i);
1691                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1692                         break;
1693
1694                 btrfs_set_super_bytenr(sb, bytenr);
1695
1696                 crc = ~(u32)0;
1697                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1698                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1699                 btrfs_csum_final(crc, &sb->csum[0]);
1700
1701                 /*
1702                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1703                  * zero filled, we can use it directly
1704                  */
1705                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1706                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1707                 if (ret != BTRFS_SUPER_INFO_SIZE)
1708                         goto write_err;
1709         }
1710
1711         return 0;
1712
1713 write_err:
1714         if (ret > 0)
1715                 fprintf(stderr, "WARNING: failed to write all sb data\n");
1716         else
1717                 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1718                         strerror(errno));
1719         return ret;
1720 }
1721
1722 int write_all_supers(struct btrfs_root *root)
1723 {
1724         struct list_head *cur;
1725         struct list_head *head = &root->fs_info->fs_devices->devices;
1726         struct btrfs_device *dev;
1727         struct btrfs_super_block *sb;
1728         struct btrfs_dev_item *dev_item;
1729         int ret;
1730         u64 flags;
1731
1732         sb = root->fs_info->super_copy;
1733         dev_item = &sb->dev_item;
1734         list_for_each(cur, head) {
1735                 dev = list_entry(cur, struct btrfs_device, dev_list);
1736                 if (!dev->writeable)
1737                         continue;
1738
1739                 btrfs_set_stack_device_generation(dev_item, 0);
1740                 btrfs_set_stack_device_type(dev_item, dev->type);
1741                 btrfs_set_stack_device_id(dev_item, dev->devid);
1742                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1743                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1744                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1745                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1746                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1747                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1748                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1749
1750                 flags = btrfs_super_flags(sb);
1751                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1752
1753                 ret = write_dev_supers(root, sb, dev);
1754                 BUG_ON(ret);
1755         }
1756         return 0;
1757 }
1758
1759 int write_ctree_super(struct btrfs_trans_handle *trans,
1760                       struct btrfs_root *root)
1761 {
1762         int ret;
1763         struct btrfs_root *tree_root = root->fs_info->tree_root;
1764         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1765
1766         if (root->fs_info->readonly)
1767                 return 0;
1768
1769         btrfs_set_super_generation(root->fs_info->super_copy,
1770                                    trans->transid);
1771         btrfs_set_super_root(root->fs_info->super_copy,
1772                              tree_root->node->start);
1773         btrfs_set_super_root_level(root->fs_info->super_copy,
1774                                    btrfs_header_level(tree_root->node));
1775         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1776                                    chunk_root->node->start);
1777         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1778                                          btrfs_header_level(chunk_root->node));
1779         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1780                                 btrfs_header_generation(chunk_root->node));
1781
1782         ret = write_all_supers(root);
1783         if (ret)
1784                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1785         return ret;
1786 }
1787
1788 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1789 {
1790         int ret;
1791         struct btrfs_trans_handle *trans;
1792         struct btrfs_root *root = fs_info->tree_root;
1793
1794         if (fs_info->last_trans_committed !=
1795             fs_info->generation) {
1796                 BUG_ON(!root);
1797                 trans = btrfs_start_transaction(root, 1);
1798                 btrfs_commit_transaction(trans, root);
1799                 trans = btrfs_start_transaction(root, 1);
1800                 ret = commit_tree_roots(trans, fs_info);
1801                 BUG_ON(ret);
1802                 ret = __commit_transaction(trans, root);
1803                 BUG_ON(ret);
1804                 write_ctree_super(trans, root);
1805                 btrfs_free_transaction(root, trans);
1806         }
1807
1808         if (fs_info->finalize_on_close) {
1809                 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1810                 root->fs_info->finalize_on_close = 0;
1811                 ret = write_all_supers(root);
1812                 if (ret)
1813                         fprintf(stderr,
1814                                 "failed to write new super block err %d\n", ret);
1815         }
1816         btrfs_free_block_groups(fs_info);
1817
1818         free_fs_roots_tree(&fs_info->fs_root_tree);
1819
1820         btrfs_release_all_roots(fs_info);
1821         btrfs_close_devices(fs_info->fs_devices);
1822         btrfs_cleanup_all_caches(fs_info);
1823         btrfs_free_fs_info(fs_info);
1824         return 0;
1825 }
1826
1827 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1828                      struct extent_buffer *eb)
1829 {
1830         return clear_extent_buffer_dirty(eb);
1831 }
1832
1833 int wait_on_tree_block_writeback(struct btrfs_root *root,
1834                                  struct extent_buffer *eb)
1835 {
1836         return 0;
1837 }
1838
1839 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1840 {
1841         set_extent_buffer_dirty(eb);
1842 }
1843
1844 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1845 {
1846         int ret;
1847
1848         ret = extent_buffer_uptodate(buf);
1849         if (!ret)
1850                 return ret;
1851
1852         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1853         return !ret;
1854 }
1855
1856 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1857 {
1858         return set_extent_buffer_uptodate(eb);
1859 }