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->last_inode_alloc = 0;
 498
 499         INIT_LIST_HEAD(&root->dirty_list);
 500         INIT_LIST_HEAD(&root->orphan_data_extents);
 501         memset(&root->root_key, 0, sizeof(root->root_key));
 502         memset(&root->root_item, 0, sizeof(root->root_item));
 503         root->root_key.objectid = objectid;
 504 }
 505
 506 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 507                                struct btrfs_root *root)
 508 {
 509         int ret;
 510         u64 old_root_bytenr;
 511         struct btrfs_root *tree_root = root->fs_info->tree_root;
 512
 513         btrfs_write_dirty_block_groups(trans, root);
 514         while(1) {
 515                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 516                 if (old_root_bytenr == root->node->start)
 517                         break;
 518                 btrfs_set_root_bytenr(&root->root_item,
 519                                        root->node->start);
 520                 btrfs_set_root_generation(&root->root_item,
 521                                           trans->transid);
 522                 root->root_item.level = btrfs_header_level(root->node);
 523                 ret = btrfs_update_root(trans, tree_root,
 524                                         &root->root_key,
 525                                         &root->root_item);
 526                 BUG_ON(ret);
 527                 btrfs_write_dirty_block_groups(trans, root);
 528         }
 529         return 0;
 530 }
 531
 532 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 533                              struct btrfs_fs_info *fs_info)
 534 {
 535         struct btrfs_root *root;
 536         struct list_head *next;
 537         struct extent_buffer *eb;
 538         int ret;
 539
 540         if (fs_info->readonly)
 541                 return 0;
 542
 543         eb = fs_info->tree_root->node;
 544         extent_buffer_get(eb);
 545         ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 546         free_extent_buffer(eb);
 547         if (ret)
 548                 return ret;
 549
 550         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 551                 next = fs_info->dirty_cowonly_roots.next;
 552                 list_del_init(next);
 553                 root = list_entry(next, struct btrfs_root, dirty_list);
 554                 update_cowonly_root(trans, root);
 555                 free_extent_buffer(root->commit_root);
 556                 root->commit_root = NULL;
 557         }
 558
 559         return 0;
 560 }
 561
 562 static int __commit_transaction(struct btrfs_trans_handle *trans,
 563                                 struct btrfs_root *root)
 564 {
 565         u64 start;
 566         u64 end;
 567         struct extent_buffer *eb;
 568         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 569         int ret;
 570
 571         while(1) {
 572                 ret = find_first_extent_bit(tree, 0, &start, &end,
 573                                             EXTENT_DIRTY);
 574                 if (ret)
 575                         break;
 576                 while(start <= end) {
 577                         eb = find_first_extent_buffer(tree, start);
 578                         BUG_ON(!eb || eb->start != start);
 579                         ret = write_tree_block(trans, root, eb);
 580                         BUG_ON(ret);
 581                         start += eb->len;
 582                         clear_extent_buffer_dirty(eb);
 583                         free_extent_buffer(eb);
 584                 }
 585         }
 586         return 0;
 587 }
 588
 589 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 590                              struct btrfs_root *root)
 591 {
 592         u64 transid = trans->transid;
 593         int ret = 0;
 594         struct btrfs_fs_info *fs_info = root->fs_info;
 595
 596         if (root->commit_root == root->node)
 597                 goto commit_tree;
 598         if (root == root->fs_info->tree_root)
 599                 goto commit_tree;
 600         if (root == root->fs_info->chunk_root)
 601                 goto commit_tree;
 602
 603         free_extent_buffer(root->commit_root);
 604         root->commit_root = NULL;
 605
 606         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 607         btrfs_set_root_generation(&root->root_item, trans->transid);
 608         root->root_item.level = btrfs_header_level(root->node);
 609         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 610                                 &root->root_key, &root->root_item);
 611         BUG_ON(ret);
 612 commit_tree:
 613         ret = commit_tree_roots(trans, fs_info);
 614         BUG_ON(ret);
 615         ret = __commit_transaction(trans, root);
 616         BUG_ON(ret);
 617         write_ctree_super(trans, root);
 618         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 619                                    &fs_info->pinned_extents);
 620         btrfs_free_transaction(root, trans);
 621         free_extent_buffer(root->commit_root);
 622         root->commit_root = NULL;
 623         fs_info->running_transaction = NULL;
 624         fs_info->last_trans_committed = transid;
 625         return 0;
 626 }
 627
 628 static int find_and_setup_root(struct btrfs_root *tree_root,
 629                                struct btrfs_fs_info *fs_info,
 630                                u64 objectid, struct btrfs_root *root)
 631 {
 632         int ret;
 633         u32 blocksize;
 634         u64 generation;
 635
 636         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 637                      tree_root->sectorsize, tree_root->stripesize,
 638                      root, fs_info, objectid);
 639         ret = btrfs_find_last_root(tree_root, objectid,
 640                                    &root->root_item, &root->root_key);
 641         if (ret)
 642                 return ret;
 643
 644         blocksize = root->nodesize;
 645         generation = btrfs_root_generation(&root->root_item);
 646         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 647                                      blocksize, generation);
 648         if (!extent_buffer_uptodate(root->node))
 649                 return -EIO;
 650
 651         return 0;
 652 }
 653
 654 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 655                                struct btrfs_fs_info *fs_info,
 656                                struct btrfs_super_block *disk_super)
 657 {
 658         u32 blocksize;
 659         u64 blocknr = btrfs_super_log_root(disk_super);
 660         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 661
 662         if (!log_root)
 663                 return -ENOMEM;
 664
 665         if (blocknr == 0) {
 666                 free(log_root);
 667                 return 0;
 668         }
 669
 670         blocksize = tree_root->nodesize;
 671
 672         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 673                      tree_root->sectorsize, tree_root->stripesize,
 674                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 675
 676         log_root->node = read_tree_block(tree_root, blocknr,
 677                                      blocksize,
 678                                      btrfs_super_generation(disk_super) + 1);
 679
 680         fs_info->log_root_tree = log_root;
 681
 682         if (!extent_buffer_uptodate(log_root->node)) {
 683                 free_extent_buffer(log_root->node);
 684                 free(log_root);
 685                 fs_info->log_root_tree = NULL;
 686                 return -EIO;
 687         }
 688
 689         return 0;
 690 }
 691
 692 int btrfs_free_fs_root(struct btrfs_root *root)
 693 {
 694         if (root->node)
 695                 free_extent_buffer(root->node);
 696         if (root->commit_root)
 697                 free_extent_buffer(root->commit_root);
 698         kfree(root);
 699         return 0;
 700 }
 701
 702 static void __free_fs_root(struct rb_node *node)
 703 {
 704         struct btrfs_root *root;
 705
 706         root = container_of(node, struct btrfs_root, rb_node);
 707         btrfs_free_fs_root(root);
 708 }
 709
 710 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
 711
 712 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 713                                                struct btrfs_key *location)
 714 {
 715         struct btrfs_root *root;
 716         struct btrfs_root *tree_root = fs_info->tree_root;
 717         struct btrfs_path *path;
 718         struct extent_buffer *l;
 719         u64 generation;
 720         u32 blocksize;
 721         int ret = 0;
 722
 723         root = calloc(1, sizeof(*root));
 724         if (!root)
 725                 return ERR_PTR(-ENOMEM);
 726         if (location->offset == (u64)-1) {
 727                 ret = find_and_setup_root(tree_root, fs_info,
 728                                           location->objectid, root);
 729                 if (ret) {
 730                         free(root);
 731                         return ERR_PTR(ret);
 732                 }
 733                 goto insert;
 734         }
 735
 736         btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
 737                      tree_root->sectorsize, tree_root->stripesize,
 738                      root, fs_info, location->objectid);
 739
 740         path = btrfs_alloc_path();
 741         if (!path) {
 742                 free(root);
 743                 return ERR_PTR(-ENOMEM);
 744         }
 745
 746         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 747         if (ret != 0) {
 748                 if (ret > 0)
 749                         ret = -ENOENT;
 750                 goto out;
 751         }
 752         l = path->nodes[0];
 753         read_extent_buffer(l, &root->root_item,
 754                btrfs_item_ptr_offset(l, path->slots[0]),
 755                sizeof(root->root_item));
 756         memcpy(&root->root_key, location, sizeof(*location));
 757         ret = 0;
 758 out:
 759         btrfs_free_path(path);
 760         if (ret) {
 761                 free(root);
 762                 return ERR_PTR(ret);
 763         }
 764         generation = btrfs_root_generation(&root->root_item);
 765         blocksize = root->nodesize;
 766         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 767                                      blocksize, generation);
 768         if (!extent_buffer_uptodate(root->node)) {
 769                 free(root);
 770                 return ERR_PTR(-EIO);
 771         }
 772 insert:
 773         root->ref_cows = 1;
 774         return root;
 775 }
 776
 777 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
 778                                             void *data)
 779 {
 780         u64 objectid = *((u64 *)data);
 781         struct btrfs_root *root;
 782
 783         root = rb_entry(node, struct btrfs_root, rb_node);
 784         if (objectid > root->objectid)
 785                 return 1;
 786         else if (objectid < root->objectid)
 787                 return -1;
 788         else
 789                 return 0;
 790 }
 791
 792 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
 793                                         struct rb_node *node2)
 794 {
 795         struct btrfs_root *root;
 796
 797         root = rb_entry(node2, struct btrfs_root, rb_node);
 798         return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
 799 }
 800
 801 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 802                                       struct btrfs_key *location)
 803 {
 804         struct btrfs_root *root;
 805         struct rb_node *node;
 806         int ret;
 807         u64 objectid = location->objectid;
 808
 809         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 810                 return fs_info->tree_root;
 811         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 812                 return fs_info->extent_root;
 813         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 814                 return fs_info->chunk_root;
 815         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 816                 return fs_info->dev_root;
 817         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 818                 return fs_info->csum_root;
 819         if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
 820                 return fs_info->quota_root;
 821
 822         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 823                location->offset != (u64)-1);
 824
 825         node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
 826                          btrfs_fs_roots_compare_objectids, NULL);
 827         if (node)
 828                 return container_of(node, struct btrfs_root, rb_node);
 829
 830         root = btrfs_read_fs_root_no_cache(fs_info, location);
 831         if (IS_ERR(root))
 832                 return root;
 833
 834         ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
 835                         btrfs_fs_roots_compare_roots);
 836         BUG_ON(ret);
 837         return root;
 838 }
 839
 840 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 841 {
 842         free(fs_info->tree_root);
 843         free(fs_info->extent_root);
 844         free(fs_info->chunk_root);
 845         free(fs_info->dev_root);
 846         free(fs_info->csum_root);
 847         free(fs_info->quota_root);
 848         free(fs_info->free_space_root);
 849         free(fs_info->super_copy);
 850         free(fs_info->log_root_tree);
 851         free(fs_info);
 852 }
 853
 854 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
 855 {
 856         struct btrfs_fs_info *fs_info;
 857
 858         fs_info = calloc(1, sizeof(struct btrfs_fs_info));
 859         if (!fs_info)
 860                 return NULL;
 861
 862         fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
 863         fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
 864         fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
 865         fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
 866         fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
 867         fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
 868         fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
 869         fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
 870
 871         if (!fs_info->tree_root || !fs_info->extent_root ||
 872             !fs_info->chunk_root || !fs_info->dev_root ||
 873             !fs_info->csum_root || !fs_info->quota_root ||
 874             !fs_info->free_space_root || !fs_info->super_copy)
 875                 goto free_all;
 876
 877         extent_io_tree_init(&fs_info->extent_cache);
 878         extent_io_tree_init(&fs_info->free_space_cache);
 879         extent_io_tree_init(&fs_info->block_group_cache);
 880         extent_io_tree_init(&fs_info->pinned_extents);
 881         extent_io_tree_init(&fs_info->pending_del);
 882         extent_io_tree_init(&fs_info->extent_ins);
 883         fs_info->excluded_extents = NULL;
 884
 885         fs_info->fs_root_tree = RB_ROOT;
 886         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 887
 888         mutex_init(&fs_info->fs_mutex);
 889         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 890         INIT_LIST_HEAD(&fs_info->space_info);
 891         INIT_LIST_HEAD(&fs_info->recow_ebs);
 892
 893         if (!writable)
 894                 fs_info->readonly = 1;
 895
 896         fs_info->super_bytenr = sb_bytenr;
 897         fs_info->data_alloc_profile = (u64)-1;
 898         fs_info->metadata_alloc_profile = (u64)-1;
 899         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 900         return fs_info;
 901 free_all:
 902         btrfs_free_fs_info(fs_info);
 903         return NULL;
 904 }
 905
 906 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
 907                                  unsigned int flags)
 908 {
 909         u64 features;
 910
 911         features = btrfs_super_incompat_flags(sb) &
 912                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 913         if (features) {
 914                 printk("couldn't open because of unsupported "
 915                        "option features (%Lx).\n",
 916                        (unsigned long long)features);
 917                 return -ENOTSUP;
 918         }
 919
 920         features = btrfs_super_incompat_flags(sb);
 921         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 922                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 923                 btrfs_set_super_incompat_flags(sb, features);
 924         }
 925
 926         features = btrfs_super_compat_ro_flags(sb);
 927         if (flags & OPEN_CTREE_WRITES) {
 928                 if (flags & OPEN_CTREE_INVALIDATE_FST) {
 929                         /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
 930                         features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
 931                         btrfs_set_super_compat_ro_flags(sb, features);
 932                         /* ... and ignore the free space tree bit. */
 933                         features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
 934                 }
 935                 if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
 936                         printk("couldn't open RDWR because of unsupported "
 937                                "option features (%Lx).\n",
 938                                (unsigned long long)features);
 939                         return -ENOTSUP;
 940                 }
 941
 942         }
 943         return 0;
 944 }
 945
 946 static int find_best_backup_root(struct btrfs_super_block *super)
 947 {
 948         struct btrfs_root_backup *backup;
 949         u64 orig_gen = btrfs_super_generation(super);
 950         u64 gen = 0;
 951         int best_index = 0;
 952         int i;
 953
 954         for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
 955                 backup = super->super_roots + i;
 956                 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
 957                     btrfs_backup_tree_root_gen(backup) > gen) {
 958                         best_index = i;
 959                         gen = btrfs_backup_tree_root_gen(backup);
 960                 }
 961         }
 962         return best_index;
 963 }
 964
 965 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
 966                                       unsigned flags,
 967                                       struct btrfs_root *info_root,
 968                                       u64 objectid, char *str)
 969 {
 970         struct btrfs_super_block *sb = fs_info->super_copy;
 971         struct btrfs_root *root = fs_info->tree_root;
 972         u32 nodesize = btrfs_super_nodesize(sb);
 973         int ret;
 974
 975         ret = find_and_setup_root(root, fs_info, objectid, info_root);
 976         if (ret) {
 977                 printk("Couldn't setup %s tree\n", str);
 978                 if (!(flags & OPEN_CTREE_PARTIAL))
 979                         return -EIO;
 980                 /*
 981                  * Need a blank node here just so we don't screw up in the
 982                  * million of places that assume a root has a valid ->node
 983                  */
 984                 info_root->node =
 985                         btrfs_find_create_tree_block(fs_info, 0, nodesize);
 986                 if (!info_root->node)
 987                         return -ENOMEM;
 988                 clear_extent_buffer_uptodate(info_root->node);
 989         }
 990
 991         return 0;
 992 }
 993
 994 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
 995                           unsigned flags)
 996 {
 997         struct btrfs_super_block *sb = fs_info->super_copy;
 998         struct btrfs_root *root;
 999         struct btrfs_key key;
1000         u32 sectorsize;
1001         u32 nodesize;
1002         u32 leafsize;
1003         u32 stripesize;
1004         u64 generation;
1005         u32 blocksize;
1006         int ret;
1007
1008         nodesize = btrfs_super_nodesize(sb);
1009         leafsize = btrfs_super_leafsize(sb);
1010         sectorsize = btrfs_super_sectorsize(sb);
1011         stripesize = btrfs_super_stripesize(sb);
1012
1013         root = fs_info->tree_root;
1014         btrfs_setup_root(nodesize, leafsize, sectorsize, stripesize,
1015                      root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
1016         blocksize = root->nodesize;
1017         generation = btrfs_super_generation(sb);
1018
1019         if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
1020                 root_tree_bytenr = btrfs_super_root(sb);
1021         } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
1022                 struct btrfs_root_backup *backup;
1023                 int index = find_best_backup_root(sb);
1024                 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
1025                         fprintf(stderr, "Invalid backup root number\n");
1026                         return -EIO;
1027                 }
1028                 backup = fs_info->super_copy->super_roots + index;
1029                 root_tree_bytenr = btrfs_backup_tree_root(backup);
1030                 generation = btrfs_backup_tree_root_gen(backup);
1031         }
1032
1033         root->node = read_tree_block(root, root_tree_bytenr, blocksize,
1034                                      generation);
1035         if (!extent_buffer_uptodate(root->node)) {
1036                 fprintf(stderr, "Couldn't read tree root\n");
1037                 return -EIO;
1038         }
1039
1040         ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
1041                                          BTRFS_EXTENT_TREE_OBJECTID, "extent");
1042         if (ret)
1043                 return ret;
1044         fs_info->extent_root->track_dirty = 1;
1045
1046         ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1047                                   fs_info->dev_root);
1048         if (ret) {
1049                 printk("Couldn't setup device tree\n");
1050                 return -EIO;
1051         }
1052         fs_info->dev_root->track_dirty = 1;
1053
1054         ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1055                                          BTRFS_CSUM_TREE_OBJECTID, "csum");
1056         if (ret)
1057                 return ret;
1058         fs_info->csum_root->track_dirty = 1;
1059
1060         ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1061                                   fs_info->quota_root);
1062         if (ret == 0)
1063                 fs_info->quota_enabled = 1;
1064
1065         if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
1066                 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1067                                           fs_info->free_space_root);
1068                 if (ret) {
1069                         printk("Couldn't read free space tree\n");
1070                         return -EIO;
1071                 }
1072                 fs_info->free_space_root->track_dirty = 1;
1073         }
1074
1075         ret = find_and_setup_log_root(root, fs_info, sb);
1076         if (ret) {
1077                 printk("Couldn't setup log root tree\n");
1078                 if (!(flags & OPEN_CTREE_PARTIAL))
1079                         return -EIO;
1080         }
1081
1082         fs_info->generation = generation;
1083         fs_info->last_trans_committed = generation;
1084         if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1085             !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1086                 btrfs_read_block_groups(fs_info->tree_root);
1087
1088         key.objectid = BTRFS_FS_TREE_OBJECTID;
1089         key.type = BTRFS_ROOT_ITEM_KEY;
1090         key.offset = (u64)-1;
1091         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1092
1093         if (IS_ERR(fs_info->fs_root))
1094                 return -EIO;
1095         return 0;
1096 }
1097
1098 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1099 {
1100         if (fs_info->free_space_root)
1101                 free_extent_buffer(fs_info->free_space_root->node);
1102         if (fs_info->quota_root)
1103                 free_extent_buffer(fs_info->quota_root->node);
1104         if (fs_info->csum_root)
1105                 free_extent_buffer(fs_info->csum_root->node);
1106         if (fs_info->dev_root)
1107                 free_extent_buffer(fs_info->dev_root->node);
1108         if (fs_info->extent_root)
1109                 free_extent_buffer(fs_info->extent_root->node);
1110         if (fs_info->tree_root)
1111                 free_extent_buffer(fs_info->tree_root->node);
1112         if (fs_info->log_root_tree)
1113                 free_extent_buffer(fs_info->log_root_tree->node);
1114         if (fs_info->chunk_root)
1115                 free_extent_buffer(fs_info->chunk_root->node);
1116 }
1117
1118 static void free_map_lookup(struct cache_extent *ce)
1119 {
1120         struct map_lookup *map;
1121
1122         map = container_of(ce, struct map_lookup, ce);
1123         kfree(map);
1124 }
1125
1126 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1127
1128 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1129 {
1130         while (!list_empty(&fs_info->recow_ebs)) {
1131                 struct extent_buffer *eb;
1132                 eb = list_first_entry(&fs_info->recow_ebs,
1133                                       struct extent_buffer, recow);
1134                 list_del_init(&eb->recow);
1135                 free_extent_buffer(eb);
1136         }
1137         free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1138         extent_io_tree_cleanup(&fs_info->extent_cache);
1139         extent_io_tree_cleanup(&fs_info->free_space_cache);
1140         extent_io_tree_cleanup(&fs_info->block_group_cache);
1141         extent_io_tree_cleanup(&fs_info->pinned_extents);
1142         extent_io_tree_cleanup(&fs_info->pending_del);
1143         extent_io_tree_cleanup(&fs_info->extent_ins);
1144 }
1145
1146 int btrfs_scan_fs_devices(int fd, const char *path,
1147                           struct btrfs_fs_devices **fs_devices,
1148                           u64 sb_bytenr, unsigned sbflags,
1149                           int skip_devices)
1150 {
1151         u64 total_devs;
1152         u64 dev_size;
1153         off_t seek_ret;
1154         int ret;
1155         if (!sb_bytenr)
1156                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1157
1158         seek_ret = lseek(fd, 0, SEEK_END);
1159         if (seek_ret < 0)
1160                 return -errno;
1161
1162         dev_size = seek_ret;
1163         lseek(fd, 0, SEEK_SET);
1164         if (sb_bytenr > dev_size) {
1165                 error("superblock bytenr %llu is larger than device size %llu",
1166                                 (unsigned long long)sb_bytenr,
1167                                 (unsigned long long)dev_size);
1168                 return -EINVAL;
1169         }
1170
1171         ret = btrfs_scan_one_device(fd, path, fs_devices,
1172                                     &total_devs, sb_bytenr, sbflags);
1173         if (ret) {
1174                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1175                 return ret;
1176         }
1177
1178         if (!skip_devices && total_devs != 1) {
1179                 ret = btrfs_scan_devices();
1180                 if (ret)
1181                         return ret;
1182         }
1183         return 0;
1184 }
1185
1186 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1187                                           u64 chunk_root_bytenr)
1188 {
1189         struct btrfs_super_block *sb = fs_info->super_copy;
1190         u32 sectorsize;
1191         u32 nodesize;
1192         u32 leafsize;
1193         u32 blocksize;
1194         u32 stripesize;
1195         u64 generation;
1196         int ret;
1197
1198         nodesize = btrfs_super_nodesize(sb);
1199         leafsize = btrfs_super_leafsize(sb);
1200         sectorsize = btrfs_super_sectorsize(sb);
1201         stripesize = btrfs_super_stripesize(sb);
1202
1203         btrfs_setup_root(nodesize, leafsize, sectorsize, stripesize,
1204                      fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1205
1206         ret = btrfs_read_sys_array(fs_info->chunk_root);
1207         if (ret)
1208                 return ret;
1209
1210         blocksize = fs_info->chunk_root->nodesize;
1211         generation = btrfs_super_chunk_root_generation(sb);
1212
1213         if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1214                                             btrfs_super_sectorsize(sb))) {
1215                 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1216                         chunk_root_bytenr, btrfs_super_sectorsize(sb));
1217                 chunk_root_bytenr = 0;
1218         }
1219
1220         if (!chunk_root_bytenr)
1221                 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1222         else
1223                 generation = 0;
1224
1225         fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
1226                                                     chunk_root_bytenr,
1227                                                     blocksize, generation);
1228         if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1229                 if (fs_info->ignore_chunk_tree_error) {
1230                         warning("cannot read chunk root, continue anyway");
1231                         fs_info->chunk_root = NULL;
1232                         return 0;
1233                 } else {
1234                         error("cannot read chunk root");
1235                         return -EIO;
1236                 }
1237         }
1238
1239         if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1240                 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1241                 if (ret) {
1242                         fprintf(stderr, "Couldn't read chunk tree\n");
1243                         return ret;
1244                 }
1245         }
1246         return 0;
1247 }
1248
1249 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1250                                              u64 sb_bytenr,
1251                                              u64 root_tree_bytenr,
1252                                              u64 chunk_root_bytenr,
1253                                              unsigned flags)
1254 {
1255         struct btrfs_fs_info *fs_info;
1256         struct btrfs_super_block *disk_super;
1257         struct btrfs_fs_devices *fs_devices = NULL;
1258         struct extent_buffer *eb;
1259         int ret;
1260         int oflags;
1261         unsigned sbflags = SBREAD_DEFAULT;
1262
1263         if (sb_bytenr == 0)
1264                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1265
1266         /* try to drop all the caches */
1267         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1268                 fprintf(stderr, "Warning, could not drop caches\n");
1269
1270         fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1271         if (!fs_info) {
1272                 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1273                 return NULL;
1274         }
1275         if (flags & OPEN_CTREE_RESTORE)
1276                 fs_info->on_restoring = 1;
1277         if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1278                 fs_info->suppress_check_block_errors = 1;
1279         if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1280                 fs_info->ignore_fsid_mismatch = 1;
1281         if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1282                 fs_info->ignore_chunk_tree_error = 1;
1283
1284         if ((flags & OPEN_CTREE_RECOVER_SUPER)
1285              && (flags & OPEN_CTREE_FS_PARTIAL)) {
1286                 fprintf(stderr,
1287                     "cannot open a partially created filesystem for recovery");
1288                 goto out;
1289         }
1290
1291         if (flags & OPEN_CTREE_FS_PARTIAL)
1292                 sbflags = SBREAD_PARTIAL;
1293
1294         ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1295                         (flags & OPEN_CTREE_NO_DEVICES));
1296         if (ret)
1297                 goto out;
1298
1299         fs_info->fs_devices = fs_devices;
1300         if (flags & OPEN_CTREE_WRITES)
1301                 oflags = O_RDWR;
1302         else
1303                 oflags = O_RDONLY;
1304
1305         if (flags & OPEN_CTREE_EXCLUSIVE)
1306                 oflags |= O_EXCL;
1307
1308         ret = btrfs_open_devices(fs_devices, oflags);
1309         if (ret)
1310                 goto out;
1311
1312         disk_super = fs_info->super_copy;
1313         if (flags & OPEN_CTREE_RECOVER_SUPER)
1314                 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1315                                 sb_bytenr, SBREAD_RECOVER);
1316         else
1317                 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1318                                 sbflags);
1319         if (ret) {
1320                 printk("No valid btrfs found\n");
1321                 goto out_devices;
1322         }
1323
1324         if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1325             !fs_info->ignore_fsid_mismatch) {
1326                 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1327                 goto out_devices;
1328         }
1329
1330         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1331
1332         ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
1333         if (ret)
1334                 goto out_devices;
1335
1336         ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1337         if (ret)
1338                 goto out_chunk;
1339
1340         /* Chunk tree root is unable to read, return directly */
1341         if (!fs_info->chunk_root)
1342                 return fs_info;
1343
1344         eb = fs_info->chunk_root->node;
1345         read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1346                            btrfs_header_chunk_tree_uuid(eb),
1347                            BTRFS_UUID_SIZE);
1348
1349         ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1350         if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1351             !fs_info->ignore_chunk_tree_error)
1352                 goto out_chunk;
1353
1354         return fs_info;
1355
1356 out_chunk:
1357         btrfs_release_all_roots(fs_info);
1358         btrfs_cleanup_all_caches(fs_info);
1359 out_devices:
1360         btrfs_close_devices(fs_devices);
1361 out:
1362         btrfs_free_fs_info(fs_info);
1363         return NULL;
1364 }
1365
1366 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1367                                          u64 sb_bytenr, u64 root_tree_bytenr,
1368                                          u64 chunk_root_bytenr,
1369                                          unsigned flags)
1370 {
1371         int fp;
1372         int ret;
1373         struct btrfs_fs_info *info;
1374         int oflags = O_RDWR;
1375         struct stat st;
1376
1377         ret = stat(filename, &st);
1378         if (ret < 0) {
1379                 error("cannot stat '%s': %s", filename, strerror(errno));
1380                 return NULL;
1381         }
1382         if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1383                 error("not a regular file or block device: %s", filename);
1384                 return NULL;
1385         }
1386
1387         if (!(flags & OPEN_CTREE_WRITES))
1388                 oflags = O_RDONLY;
1389
1390         fp = open(filename, oflags);
1391         if (fp < 0) {
1392                 error("cannot open '%s': %s", filename, strerror(errno));
1393                 return NULL;
1394         }
1395         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1396                                chunk_root_bytenr, flags);
1397         close(fp);
1398         return info;
1399 }
1400
1401 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1402                               unsigned flags)
1403 {
1404         struct btrfs_fs_info *info;
1405
1406         /* This flags may not return fs_info with any valid root */
1407         BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1408         info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1409         if (!info)
1410                 return NULL;
1411         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1412                 return info->chunk_root;
1413         return info->fs_root;
1414 }
1415
1416 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1417                                  unsigned flags)
1418 {
1419         struct btrfs_fs_info *info;
1420
1421         /* This flags may not return fs_info with any valid root */
1422         if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
1423                 error("invalid open_ctree flags: 0x%llx",
1424                                 (unsigned long long)flags);
1425                 return NULL;
1426         }
1427         info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1428         if (!info)
1429                 return NULL;
1430         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1431                 return info->chunk_root;
1432         return info->fs_root;
1433 }
1434
1435 /*
1436  * Check if the super is valid:
1437  * - nodesize/sectorsize - minimum, maximum, alignment
1438  * - tree block starts   - alignment
1439  * - number of devices   - something sane
1440  * - sys array size      - maximum
1441  */
1442 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1443 {
1444         u8 result[BTRFS_CSUM_SIZE];
1445         u32 crc;
1446         u16 csum_type;
1447         int csum_size;
1448
1449         if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1450                 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1451                         if (!(sbflags & SBREAD_PARTIAL)) {
1452                                 error("superblock magic doesn't match");
1453                                 return -EIO;
1454                         }
1455                 }
1456         }
1457
1458         csum_type = btrfs_super_csum_type(sb);
1459         if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1460                 error("unsupported checksum algorithm %u", csum_type);
1461                 return -EIO;
1462         }
1463         csum_size = btrfs_csum_sizes[csum_type];
1464
1465         crc = ~(u32)0;
1466         crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1467                               BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1468         btrfs_csum_final(crc, result);
1469
1470         if (memcmp(result, sb->csum, csum_size)) {
1471                 error("superblock checksum mismatch");
1472                 return -EIO;
1473         }
1474         if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1475                 error("tree_root level too big: %d >= %d",
1476                         btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1477                 goto error_out;
1478         }
1479         if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1480                 error("chunk_root level too big: %d >= %d",
1481                         btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1482                 goto error_out;
1483         }
1484         if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1485                 error("log_root level too big: %d >= %d",
1486                         btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1487                 goto error_out;
1488         }
1489
1490         if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1491                 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1492                 goto error_out;
1493         }
1494         if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1495                 error("chunk_root block unaligned: %llu",
1496                         btrfs_super_chunk_root(sb));
1497                 goto error_out;
1498         }
1499         if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1500                 error("log_root block unaligned: %llu",
1501                         btrfs_super_log_root(sb));
1502                 goto error_out;
1503         }
1504         if (btrfs_super_nodesize(sb) < 4096) {
1505                 error("nodesize too small: %u < 4096",
1506                         btrfs_super_nodesize(sb));
1507                 goto error_out;
1508         }
1509         if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1510                 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1511                 goto error_out;
1512         }
1513         if (btrfs_super_sectorsize(sb) < 4096) {
1514                 error("sectorsize too small: %u < 4096",
1515                         btrfs_super_sectorsize(sb));
1516                 goto error_out;
1517         }
1518         if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1519                 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1520                 goto error_out;
1521         }
1522         if (btrfs_super_total_bytes(sb) == 0) {
1523                 error("invalid total_bytes 0");
1524                 goto error_out;
1525         }
1526         if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1527                 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1528                 goto error_out;
1529         }
1530         if ((btrfs_super_stripesize(sb) != 4096)
1531                 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1532                 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1533                 goto error_out;
1534         }
1535
1536         if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1537                 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1538                 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1539
1540                 uuid_unparse(sb->fsid, fsid);
1541                 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1542                 error("dev_item UUID does not match fsid: %s != %s",
1543                         dev_fsid, fsid);
1544                 goto error_out;
1545         }
1546
1547         /*
1548          * Hint to catch really bogus numbers, bitflips or so
1549          */
1550         if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1551                 warning("suspicious number of devices: %llu",
1552                         btrfs_super_num_devices(sb));
1553         }
1554
1555         if (btrfs_super_num_devices(sb) == 0) {
1556                 error("number of devices is 0");
1557                 goto error_out;
1558         }
1559
1560         /*
1561          * Obvious sys_chunk_array corruptions, it must hold at least one key
1562          * and one chunk
1563          */
1564         if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1565                 error("system chunk array too big %u > %u",
1566                       btrfs_super_sys_array_size(sb),
1567                       BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1568                 goto error_out;
1569         }
1570         if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1571                         + sizeof(struct btrfs_chunk)) {
1572                 error("system chunk array too small %u < %zu",
1573                       btrfs_super_sys_array_size(sb),
1574                       sizeof(struct btrfs_disk_key) +
1575                       sizeof(struct btrfs_chunk));
1576                 goto error_out;
1577         }
1578
1579         return 0;
1580
1581 error_out:
1582         error("superblock checksum matches but it has invalid members");
1583         return -EIO;
1584 }
1585
1586 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1587                          unsigned sbflags)
1588 {
1589         u8 fsid[BTRFS_FSID_SIZE];
1590         int fsid_is_initialized = 0;
1591         char tmp[BTRFS_SUPER_INFO_SIZE];
1592         struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1593         int i;
1594         int ret;
1595         int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1596         u64 transid = 0;
1597         u64 bytenr;
1598
1599         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1600                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1601                 /* real error */
1602                 if (ret < 0)
1603                         return -errno;
1604
1605                 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1606                 if (ret < BTRFS_SUPER_INFO_SIZE)
1607                         return -ENOENT;
1608
1609                 if (btrfs_super_bytenr(buf) != sb_bytenr)
1610                         return -EIO;
1611
1612                 ret = check_super(buf, sbflags);
1613                 if (ret < 0)
1614                         return ret;
1615                 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1616                 return 0;
1617         }
1618
1619         /*
1620         * we would like to check all the supers, but that would make
1621         * a btrfs mount succeed after a mkfs from a different FS.
1622         * So, we need to add a special mount option to scan for
1623         * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1624         */
1625
1626         for (i = 0; i < max_super; i++) {
1627                 bytenr = btrfs_sb_offset(i);
1628                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1629                 if (ret < BTRFS_SUPER_INFO_SIZE)
1630                         break;
1631
1632                 if (btrfs_super_bytenr(buf) != bytenr )
1633                         continue;
1634                 /* if magic is NULL, the device was removed */
1635                 if (btrfs_super_magic(buf) == 0 && i == 0)
1636                         break;
1637                 if (check_super(buf, sbflags))
1638                         continue;
1639
1640                 if (!fsid_is_initialized) {
1641                         memcpy(fsid, buf->fsid, sizeof(fsid));
1642                         fsid_is_initialized = 1;
1643                 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1644                         /*
1645                          * the superblocks (the original one and
1646                          * its backups) contain data of different
1647                          * filesystems -> the super cannot be trusted
1648                          */
1649                         continue;
1650                 }
1651
1652                 if (btrfs_super_generation(buf) > transid) {
1653                         memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1654                         transid = btrfs_super_generation(buf);
1655                 }
1656         }
1657
1658         return transid > 0 ? 0 : -1;
1659 }
1660
1661 static int write_dev_supers(struct btrfs_root *root,
1662                             struct btrfs_super_block *sb,
1663                             struct btrfs_device *device)
1664 {
1665         u64 bytenr;
1666         u32 crc;
1667         int i, ret;
1668
1669         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1670                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1671                 crc = ~(u32)0;
1672                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1673                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1674                 btrfs_csum_final(crc, &sb->csum[0]);
1675
1676                 /*
1677                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1678                  * zero filled, we can use it directly
1679                  */
1680                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1681                                 BTRFS_SUPER_INFO_SIZE,
1682                                 root->fs_info->super_bytenr);
1683                 if (ret != BTRFS_SUPER_INFO_SIZE)
1684                         goto write_err;
1685                 return 0;
1686         }
1687
1688         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1689                 bytenr = btrfs_sb_offset(i);
1690                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1691                         break;
1692
1693                 btrfs_set_super_bytenr(sb, bytenr);
1694
1695                 crc = ~(u32)0;
1696                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1697                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1698                 btrfs_csum_final(crc, &sb->csum[0]);
1699
1700                 /*
1701                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1702                  * zero filled, we can use it directly
1703                  */
1704                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1705                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1706                 if (ret != BTRFS_SUPER_INFO_SIZE)
1707                         goto write_err;
1708         }
1709
1710         return 0;
1711
1712 write_err:
1713         if (ret > 0)
1714                 fprintf(stderr, "WARNING: failed to write all sb data\n");
1715         else
1716                 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1717                         strerror(errno));
1718         return ret;
1719 }
1720
1721 int write_all_supers(struct btrfs_root *root)
1722 {
1723         struct list_head *cur;
1724         struct list_head *head = &root->fs_info->fs_devices->devices;
1725         struct btrfs_device *dev;
1726         struct btrfs_super_block *sb;
1727         struct btrfs_dev_item *dev_item;
1728         int ret;
1729         u64 flags;
1730
1731         sb = root->fs_info->super_copy;
1732         dev_item = &sb->dev_item;
1733         list_for_each(cur, head) {
1734                 dev = list_entry(cur, struct btrfs_device, dev_list);
1735                 if (!dev->writeable)
1736                         continue;
1737
1738                 btrfs_set_stack_device_generation(dev_item, 0);
1739                 btrfs_set_stack_device_type(dev_item, dev->type);
1740                 btrfs_set_stack_device_id(dev_item, dev->devid);
1741                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1742                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1743                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1744                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1745                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1746                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1747                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1748
1749                 flags = btrfs_super_flags(sb);
1750                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1751
1752                 ret = write_dev_supers(root, sb, dev);
1753                 BUG_ON(ret);
1754         }
1755         return 0;
1756 }
1757
1758 int write_ctree_super(struct btrfs_trans_handle *trans,
1759                       struct btrfs_root *root)
1760 {
1761         int ret;
1762         struct btrfs_root *tree_root = root->fs_info->tree_root;
1763         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1764
1765         if (root->fs_info->readonly)
1766                 return 0;
1767
1768         btrfs_set_super_generation(root->fs_info->super_copy,
1769                                    trans->transid);
1770         btrfs_set_super_root(root->fs_info->super_copy,
1771                              tree_root->node->start);
1772         btrfs_set_super_root_level(root->fs_info->super_copy,
1773                                    btrfs_header_level(tree_root->node));
1774         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1775                                    chunk_root->node->start);
1776         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1777                                          btrfs_header_level(chunk_root->node));
1778         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1779                                 btrfs_header_generation(chunk_root->node));
1780
1781         ret = write_all_supers(root);
1782         if (ret)
1783                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1784         return ret;
1785 }
1786
1787 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1788 {
1789         int ret;
1790         struct btrfs_trans_handle *trans;
1791         struct btrfs_root *root = fs_info->tree_root;
1792
1793         if (fs_info->last_trans_committed !=
1794             fs_info->generation) {
1795                 BUG_ON(!root);
1796                 trans = btrfs_start_transaction(root, 1);
1797                 btrfs_commit_transaction(trans, root);
1798                 trans = btrfs_start_transaction(root, 1);
1799                 ret = commit_tree_roots(trans, fs_info);
1800                 BUG_ON(ret);
1801                 ret = __commit_transaction(trans, root);
1802                 BUG_ON(ret);
1803                 write_ctree_super(trans, root);
1804                 btrfs_free_transaction(root, trans);
1805         }
1806
1807         if (fs_info->finalize_on_close) {
1808                 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1809                 root->fs_info->finalize_on_close = 0;
1810                 ret = write_all_supers(root);
1811                 if (ret)
1812                         fprintf(stderr,
1813                                 "failed to write new super block err %d\n", ret);
1814         }
1815         btrfs_free_block_groups(fs_info);
1816
1817         free_fs_roots_tree(&fs_info->fs_root_tree);
1818
1819         btrfs_release_all_roots(fs_info);
1820         btrfs_close_devices(fs_info->fs_devices);
1821         btrfs_cleanup_all_caches(fs_info);
1822         btrfs_free_fs_info(fs_info);
1823         return 0;
1824 }
1825
1826 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1827                      struct extent_buffer *eb)
1828 {
1829         return clear_extent_buffer_dirty(eb);
1830 }
1831
1832 int wait_on_tree_block_writeback(struct btrfs_root *root,
1833                                  struct extent_buffer *eb)
1834 {
1835         return 0;
1836 }
1837
1838 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1839 {
1840         set_extent_buffer_dirty(eb);
1841 }
1842
1843 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1844 {
1845         int ret;
1846
1847         ret = extent_buffer_uptodate(buf);
1848         if (!ret)
1849                 return ret;
1850
1851         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1852         return !ret;
1853 }
1854
1855 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1856 {
1857         return set_extent_buffer_uptodate(eb);
1858 }