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, char *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         char 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(io_tree, 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 (!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 (!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         eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
 340         if (!eb)
 341                 return ERR_PTR(-ENOMEM);
 342
 343         if (btrfs_buffer_uptodate(eb, parent_transid))
 344                 return eb;
 345
 346         while (1) {
 347                 ret = read_whole_eb(fs_info, eb, mirror_num);
 348                 if (ret == 0 && csum_tree_block_fs_info(fs_info, eb, 1) == 0 &&
 349                     check_tree_block(fs_info, eb) == 0 &&
 350                     verify_parent_transid(eb->tree, eb, parent_transid, ignore)
 351                     == 0) {
 352                         if (eb->flags & EXTENT_BAD_TRANSID &&
 353                             list_empty(&eb->recow)) {
 354                                 list_add_tail(&eb->recow,
 355                                               &fs_info->recow_ebs);
 356                                 eb->refs++;
 357                         }
 358                         btrfs_set_buffer_uptodate(eb);
 359                         return eb;
 360                 }
 361                 if (ignore) {
 362                         if (check_tree_block(fs_info, eb)) {
 363                                 if (!fs_info->suppress_check_block_errors)
 364                                         print_tree_block_error(fs_info, eb,
 365                                                 check_tree_block(fs_info, eb));
 366                         } else {
 367                                 if (!fs_info->suppress_check_block_errors)
 368                                         fprintf(stderr, "Csum didn't match\n");
 369                         }
 370                         ret = -EIO;
 371                         break;
 372                 }
 373                 num_copies = btrfs_num_copies(&fs_info->mapping_tree,
 374                                               eb->start, eb->len);
 375                 if (num_copies == 1) {
 376                         ignore = 1;
 377                         continue;
 378                 }
 379                 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
 380                         best_transid = btrfs_header_generation(eb);
 381                         good_mirror = mirror_num;
 382                 }
 383                 mirror_num++;
 384                 if (mirror_num > num_copies) {
 385                         mirror_num = good_mirror;
 386                         ignore = 1;
 387                         continue;
 388                 }
 389         }
 390         free_extent_buffer(eb);
 391         return ERR_PTR(ret);
 392 }
 393
 394 int read_extent_data(struct btrfs_root *root, char *data,
 395                            u64 logical, u64 *len, int mirror)
 396 {
 397         u64 offset = 0;
 398         struct btrfs_multi_bio *multi = NULL;
 399         struct btrfs_fs_info *info = root->fs_info;
 400         struct btrfs_device *device;
 401         int ret = 0;
 402         u64 max_len = *len;
 403
 404         ret = btrfs_map_block(&info->mapping_tree, READ, logical, len,
 405                               &multi, mirror, NULL);
 406         if (ret) {
 407                 fprintf(stderr, "Couldn't map the block %llu\n",
 408                                 logical + offset);
 409                 goto err;
 410         }
 411         device = multi->stripes[0].dev;
 412
 413         if (device->fd <= 0)
 414                 goto err;
 415         if (*len > max_len)
 416                 *len = max_len;
 417
 418         ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
 419         if (ret != *len)
 420                 ret = -EIO;
 421         else
 422                 ret = 0;
 423 err:
 424         kfree(multi);
 425         return ret;
 426 }
 427
 428 int write_and_map_eb(struct btrfs_trans_handle *trans,
 429                      struct btrfs_root *root,
 430                      struct extent_buffer *eb)
 431 {
 432         int ret;
 433         int dev_nr;
 434         u64 length;
 435         u64 *raid_map = NULL;
 436         struct btrfs_multi_bio *multi = NULL;
 437
 438         dev_nr = 0;
 439         length = eb->len;
 440         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 441                               eb->start, &length, &multi, 0, &raid_map);
 442
 443         if (raid_map) {
 444                 ret = write_raid56_with_parity(root->fs_info, eb, multi,
 445                                                length, raid_map);
 446                 BUG_ON(ret);
 447         } else while (dev_nr < multi->num_stripes) {
 448                 BUG_ON(ret);
 449                 eb->fd = multi->stripes[dev_nr].dev->fd;
 450                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 451                 multi->stripes[dev_nr].dev->total_ios++;
 452                 dev_nr++;
 453                 ret = write_extent_to_disk(eb);
 454                 BUG_ON(ret);
 455         }
 456         kfree(raid_map);
 457         kfree(multi);
 458         return 0;
 459 }
 460
 461 int write_tree_block(struct btrfs_trans_handle *trans,
 462                      struct btrfs_root *root,
 463                      struct extent_buffer *eb)
 464 {
 465         if (check_tree_block(root->fs_info, eb)) {
 466                 print_tree_block_error(root->fs_info, eb,
 467                                 check_tree_block(root->fs_info, eb));
 468                 BUG();
 469         }
 470
 471         if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
 472                 BUG();
 473
 474         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 475         csum_tree_block(root, eb, 0);
 476
 477         return write_and_map_eb(trans, root, eb);
 478 }
 479
 480 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 481                         u32 stripesize, struct btrfs_root *root,
 482                         struct btrfs_fs_info *fs_info, u64 objectid)
 483 {
 484         root->node = NULL;
 485         root->commit_root = NULL;
 486         root->sectorsize = sectorsize;
 487         root->nodesize = nodesize;
 488         root->leafsize = leafsize;
 489         root->stripesize = stripesize;
 490         root->ref_cows = 0;
 491         root->track_dirty = 0;
 492
 493         root->fs_info = fs_info;
 494         root->objectid = objectid;
 495         root->last_trans = 0;
 496         root->highest_inode = 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         return 0;
 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         __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         __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         __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         BUG_ON(!path);
 743         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 744         if (ret != 0) {
 745                 if (ret > 0)
 746                         ret = -ENOENT;
 747                 goto out;
 748         }
 749         l = path->nodes[0];
 750         read_extent_buffer(l, &root->root_item,
 751                btrfs_item_ptr_offset(l, path->slots[0]),
 752                sizeof(root->root_item));
 753         memcpy(&root->root_key, location, sizeof(*location));
 754         ret = 0;
 755 out:
 756         btrfs_free_path(path);
 757         if (ret) {
 758                 free(root);
 759                 return ERR_PTR(ret);
 760         }
 761         generation = btrfs_root_generation(&root->root_item);
 762         blocksize = root->nodesize;
 763         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 764                                      blocksize, generation);
 765         if (!extent_buffer_uptodate(root->node)) {
 766                 free(root);
 767                 return ERR_PTR(-EIO);
 768         }
 769 insert:
 770         root->ref_cows = 1;
 771         return root;
 772 }
 773
 774 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
 775                                             void *data)
 776 {
 777         u64 objectid = *((u64 *)data);
 778         struct btrfs_root *root;
 779
 780         root = rb_entry(node, struct btrfs_root, rb_node);
 781         if (objectid > root->objectid)
 782                 return 1;
 783         else if (objectid < root->objectid)
 784                 return -1;
 785         else
 786                 return 0;
 787 }
 788
 789 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
 790                                         struct rb_node *node2)
 791 {
 792         struct btrfs_root *root;
 793
 794         root = rb_entry(node2, struct btrfs_root, rb_node);
 795         return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
 796 }
 797
 798 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 799                                       struct btrfs_key *location)
 800 {
 801         struct btrfs_root *root;
 802         struct rb_node *node;
 803         int ret;
 804         u64 objectid = location->objectid;
 805
 806         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 807                 return fs_info->tree_root;
 808         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 809                 return fs_info->extent_root;
 810         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 811                 return fs_info->chunk_root;
 812         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 813                 return fs_info->dev_root;
 814         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 815                 return fs_info->csum_root;
 816         if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
 817                 return fs_info->quota_root;
 818
 819         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 820                location->offset != (u64)-1);
 821
 822         node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
 823                          btrfs_fs_roots_compare_objectids, NULL);
 824         if (node)
 825                 return container_of(node, struct btrfs_root, rb_node);
 826
 827         root = btrfs_read_fs_root_no_cache(fs_info, location);
 828         if (IS_ERR(root))
 829                 return root;
 830
 831         ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
 832                         btrfs_fs_roots_compare_roots);
 833         BUG_ON(ret);
 834         return root;
 835 }
 836
 837 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 838 {
 839         free(fs_info->tree_root);
 840         free(fs_info->extent_root);
 841         free(fs_info->chunk_root);
 842         free(fs_info->dev_root);
 843         free(fs_info->csum_root);
 844         free(fs_info->quota_root);
 845         free(fs_info->free_space_root);
 846         free(fs_info->super_copy);
 847         free(fs_info->log_root_tree);
 848         free(fs_info);
 849 }
 850
 851 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
 852 {
 853         struct btrfs_fs_info *fs_info;
 854
 855         fs_info = calloc(1, sizeof(struct btrfs_fs_info));
 856         if (!fs_info)
 857                 return NULL;
 858
 859         fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
 860         fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
 861         fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
 862         fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
 863         fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
 864         fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
 865         fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
 866         fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
 867
 868         if (!fs_info->tree_root || !fs_info->extent_root ||
 869             !fs_info->chunk_root || !fs_info->dev_root ||
 870             !fs_info->csum_root || !fs_info->quota_root ||
 871             !fs_info->free_space_root || !fs_info->super_copy)
 872                 goto free_all;
 873
 874         extent_io_tree_init(&fs_info->extent_cache);
 875         extent_io_tree_init(&fs_info->free_space_cache);
 876         extent_io_tree_init(&fs_info->block_group_cache);
 877         extent_io_tree_init(&fs_info->pinned_extents);
 878         extent_io_tree_init(&fs_info->pending_del);
 879         extent_io_tree_init(&fs_info->extent_ins);
 880         fs_info->excluded_extents = NULL;
 881
 882         fs_info->fs_root_tree = RB_ROOT;
 883         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 884
 885         mutex_init(&fs_info->fs_mutex);
 886         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 887         INIT_LIST_HEAD(&fs_info->space_info);
 888         INIT_LIST_HEAD(&fs_info->recow_ebs);
 889
 890         if (!writable)
 891                 fs_info->readonly = 1;
 892
 893         fs_info->super_bytenr = sb_bytenr;
 894         fs_info->data_alloc_profile = (u64)-1;
 895         fs_info->metadata_alloc_profile = (u64)-1;
 896         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 897         return fs_info;
 898 free_all:
 899         btrfs_free_fs_info(fs_info);
 900         return NULL;
 901 }
 902
 903 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
 904 {
 905         u64 features;
 906
 907         features = btrfs_super_incompat_flags(sb) &
 908                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 909         if (features) {
 910                 printk("couldn't open because of unsupported "
 911                        "option features (%Lx).\n",
 912                        (unsigned long long)features);
 913                 return -ENOTSUP;
 914         }
 915
 916         features = btrfs_super_incompat_flags(sb);
 917         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 918                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 919                 btrfs_set_super_incompat_flags(sb, features);
 920         }
 921
 922         features = btrfs_super_compat_ro_flags(sb) &
 923                 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
 924         if (writable && features) {
 925                 printk("couldn't open RDWR because of unsupported "
 926                        "option features (%Lx).\n",
 927                        (unsigned long long)features);
 928                 return -ENOTSUP;
 929         }
 930         return 0;
 931 }
 932
 933 static int find_best_backup_root(struct btrfs_super_block *super)
 934 {
 935         struct btrfs_root_backup *backup;
 936         u64 orig_gen = btrfs_super_generation(super);
 937         u64 gen = 0;
 938         int best_index = 0;
 939         int i;
 940
 941         for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
 942                 backup = super->super_roots + i;
 943                 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
 944                     btrfs_backup_tree_root_gen(backup) > gen) {
 945                         best_index = i;
 946                         gen = btrfs_backup_tree_root_gen(backup);
 947                 }
 948         }
 949         return best_index;
 950 }
 951
 952 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
 953                                       unsigned flags,
 954                                       struct btrfs_root *info_root,
 955                                       u64 objectid, char *str)
 956 {
 957         struct btrfs_super_block *sb = fs_info->super_copy;
 958         struct btrfs_root *root = fs_info->tree_root;
 959         u32 nodesize = btrfs_super_nodesize(sb);
 960         int ret;
 961
 962         ret = find_and_setup_root(root, fs_info, objectid, info_root);
 963         if (ret) {
 964                 printk("Couldn't setup %s tree\n", str);
 965                 if (!(flags & OPEN_CTREE_PARTIAL))
 966                         return -EIO;
 967                 /*
 968                  * Need a blank node here just so we don't screw up in the
 969                  * million of places that assume a root has a valid ->node
 970                  */
 971                 info_root->node =
 972                         btrfs_find_create_tree_block(fs_info, 0, nodesize);
 973                 if (!info_root->node)
 974                         return -ENOMEM;
 975                 clear_extent_buffer_uptodate(NULL, info_root->node);
 976         }
 977
 978         return 0;
 979 }
 980
 981 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
 982                           unsigned flags)
 983 {
 984         struct btrfs_super_block *sb = fs_info->super_copy;
 985         struct btrfs_root *root;
 986         struct btrfs_key key;
 987         u32 sectorsize;
 988         u32 nodesize;
 989         u32 leafsize;
 990         u32 stripesize;
 991         u64 generation;
 992         u32 blocksize;
 993         int ret;
 994
 995         nodesize = btrfs_super_nodesize(sb);
 996         leafsize = btrfs_super_leafsize(sb);
 997         sectorsize = btrfs_super_sectorsize(sb);
 998         stripesize = btrfs_super_stripesize(sb);
 999
1000         root = fs_info->tree_root;
1001         __setup_root(nodesize, leafsize, sectorsize, stripesize,
1002                      root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
1003         blocksize = root->nodesize;
1004         generation = btrfs_super_generation(sb);
1005
1006         if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
1007                 root_tree_bytenr = btrfs_super_root(sb);
1008         } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
1009                 struct btrfs_root_backup *backup;
1010                 int index = find_best_backup_root(sb);
1011                 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
1012                         fprintf(stderr, "Invalid backup root number\n");
1013                         return -EIO;
1014                 }
1015                 backup = fs_info->super_copy->super_roots + index;
1016                 root_tree_bytenr = btrfs_backup_tree_root(backup);
1017                 generation = btrfs_backup_tree_root_gen(backup);
1018         }
1019
1020         root->node = read_tree_block(root, root_tree_bytenr, blocksize,
1021                                      generation);
1022         if (!extent_buffer_uptodate(root->node)) {
1023                 fprintf(stderr, "Couldn't read tree root\n");
1024                 return -EIO;
1025         }
1026
1027         ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
1028                                          BTRFS_EXTENT_TREE_OBJECTID, "extent");
1029         if (ret)
1030                 return ret;
1031         fs_info->extent_root->track_dirty = 1;
1032
1033         ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1034                                   fs_info->dev_root);
1035         if (ret) {
1036                 printk("Couldn't setup device tree\n");
1037                 return -EIO;
1038         }
1039         fs_info->dev_root->track_dirty = 1;
1040
1041         ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1042                                          BTRFS_CSUM_TREE_OBJECTID, "csum");
1043         if (ret)
1044                 return ret;
1045         fs_info->csum_root->track_dirty = 1;
1046
1047         ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1048                                   fs_info->quota_root);
1049         if (ret == 0)
1050                 fs_info->quota_enabled = 1;
1051
1052         if (btrfs_fs_compat_ro(fs_info, BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE)) {
1053                 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1054                                           fs_info->free_space_root);
1055                 if (ret) {
1056                         printk("Couldn't read free space tree\n");
1057                         return -EIO;
1058                 }
1059                 fs_info->free_space_root->track_dirty = 1;
1060         }
1061
1062         ret = find_and_setup_log_root(root, fs_info, sb);
1063         if (ret) {
1064                 printk("Couldn't setup log root tree\n");
1065                 if (!(flags & OPEN_CTREE_PARTIAL))
1066                         return -EIO;
1067         }
1068
1069         fs_info->generation = generation;
1070         fs_info->last_trans_committed = generation;
1071         if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1072             !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1073                 btrfs_read_block_groups(fs_info->tree_root);
1074
1075         key.objectid = BTRFS_FS_TREE_OBJECTID;
1076         key.type = BTRFS_ROOT_ITEM_KEY;
1077         key.offset = (u64)-1;
1078         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1079
1080         if (IS_ERR(fs_info->fs_root))
1081                 return -EIO;
1082         return 0;
1083 }
1084
1085 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1086 {
1087         if (fs_info->free_space_root)
1088                 free_extent_buffer(fs_info->free_space_root->node);
1089         if (fs_info->quota_root)
1090                 free_extent_buffer(fs_info->quota_root->node);
1091         if (fs_info->csum_root)
1092                 free_extent_buffer(fs_info->csum_root->node);
1093         if (fs_info->dev_root)
1094                 free_extent_buffer(fs_info->dev_root->node);
1095         if (fs_info->extent_root)
1096                 free_extent_buffer(fs_info->extent_root->node);
1097         if (fs_info->tree_root)
1098                 free_extent_buffer(fs_info->tree_root->node);
1099         if (fs_info->log_root_tree)
1100                 free_extent_buffer(fs_info->log_root_tree->node);
1101         if (fs_info->chunk_root)
1102                 free_extent_buffer(fs_info->chunk_root->node);
1103 }
1104
1105 static void free_map_lookup(struct cache_extent *ce)
1106 {
1107         struct map_lookup *map;
1108
1109         map = container_of(ce, struct map_lookup, ce);
1110         kfree(map);
1111 }
1112
1113 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1114
1115 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1116 {
1117         while (!list_empty(&fs_info->recow_ebs)) {
1118                 struct extent_buffer *eb;
1119                 eb = list_first_entry(&fs_info->recow_ebs,
1120                                       struct extent_buffer, recow);
1121                 list_del_init(&eb->recow);
1122                 free_extent_buffer(eb);
1123         }
1124         free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1125         extent_io_tree_cleanup(&fs_info->extent_cache);
1126         extent_io_tree_cleanup(&fs_info->free_space_cache);
1127         extent_io_tree_cleanup(&fs_info->block_group_cache);
1128         extent_io_tree_cleanup(&fs_info->pinned_extents);
1129         extent_io_tree_cleanup(&fs_info->pending_del);
1130         extent_io_tree_cleanup(&fs_info->extent_ins);
1131 }
1132
1133 int btrfs_scan_fs_devices(int fd, const char *path,
1134                           struct btrfs_fs_devices **fs_devices,
1135                           u64 sb_bytenr, unsigned sbflags,
1136                           int skip_devices)
1137 {
1138         u64 total_devs;
1139         u64 dev_size;
1140         off_t seek_ret;
1141         int ret;
1142         if (!sb_bytenr)
1143                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1144
1145         seek_ret = lseek(fd, 0, SEEK_END);
1146         if (seek_ret < 0)
1147                 return -errno;
1148
1149         dev_size = seek_ret;
1150         lseek(fd, 0, SEEK_SET);
1151         if (sb_bytenr > dev_size) {
1152                 error("superblock bytenr %llu is larger than device size %llu",
1153                                 (unsigned long long)sb_bytenr,
1154                                 (unsigned long long)dev_size);
1155                 return -EINVAL;
1156         }
1157
1158         ret = btrfs_scan_one_device(fd, path, fs_devices,
1159                                     &total_devs, sb_bytenr, sbflags);
1160         if (ret) {
1161                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1162                 return ret;
1163         }
1164
1165         if (!skip_devices && total_devs != 1) {
1166                 ret = btrfs_scan_lblkid();
1167                 if (ret)
1168                         return ret;
1169         }
1170         return 0;
1171 }
1172
1173 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1174                                           u64 chunk_root_bytenr)
1175 {
1176         struct btrfs_super_block *sb = fs_info->super_copy;
1177         u32 sectorsize;
1178         u32 nodesize;
1179         u32 leafsize;
1180         u32 blocksize;
1181         u32 stripesize;
1182         u64 generation;
1183         int ret;
1184
1185         nodesize = btrfs_super_nodesize(sb);
1186         leafsize = btrfs_super_leafsize(sb);
1187         sectorsize = btrfs_super_sectorsize(sb);
1188         stripesize = btrfs_super_stripesize(sb);
1189
1190         __setup_root(nodesize, leafsize, sectorsize, stripesize,
1191                      fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1192
1193         ret = btrfs_read_sys_array(fs_info->chunk_root);
1194         if (ret)
1195                 return ret;
1196
1197         blocksize = fs_info->chunk_root->nodesize;
1198         generation = btrfs_super_chunk_root_generation(sb);
1199
1200         if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1201                                             btrfs_super_sectorsize(sb))) {
1202                 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1203                         chunk_root_bytenr, btrfs_super_sectorsize(sb));
1204                 chunk_root_bytenr = 0;
1205         }
1206
1207         if (!chunk_root_bytenr)
1208                 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1209         else
1210                 generation = 0;
1211
1212         fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
1213                                                     chunk_root_bytenr,
1214                                                     blocksize, generation);
1215         if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1216                 if (fs_info->ignore_chunk_tree_error) {
1217                         warning("cannot read chunk root, continue anyway");
1218                         fs_info->chunk_root = NULL;
1219                         return 0;
1220                 } else {
1221                         error("cannot read chunk root");
1222                         return -EIO;
1223                 }
1224         }
1225
1226         if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1227                 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1228                 if (ret) {
1229                         fprintf(stderr, "Couldn't read chunk tree\n");
1230                         return ret;
1231                 }
1232         }
1233         return 0;
1234 }
1235
1236 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1237                                              u64 sb_bytenr,
1238                                              u64 root_tree_bytenr,
1239                                              u64 chunk_root_bytenr,
1240                                              unsigned flags)
1241 {
1242         struct btrfs_fs_info *fs_info;
1243         struct btrfs_super_block *disk_super;
1244         struct btrfs_fs_devices *fs_devices = NULL;
1245         struct extent_buffer *eb;
1246         int ret;
1247         int oflags;
1248         unsigned sbflags = SBREAD_DEFAULT;
1249
1250         if (sb_bytenr == 0)
1251                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1252
1253         /* try to drop all the caches */
1254         if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1255                 fprintf(stderr, "Warning, could not drop caches\n");
1256
1257         fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1258         if (!fs_info) {
1259                 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1260                 return NULL;
1261         }
1262         if (flags & OPEN_CTREE_RESTORE)
1263                 fs_info->on_restoring = 1;
1264         if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1265                 fs_info->suppress_check_block_errors = 1;
1266         if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1267                 fs_info->ignore_fsid_mismatch = 1;
1268         if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1269                 fs_info->ignore_chunk_tree_error = 1;
1270
1271         if ((flags & OPEN_CTREE_RECOVER_SUPER)
1272              && (flags & OPEN_CTREE_FS_PARTIAL)) {
1273                 fprintf(stderr,
1274                     "cannot open a partially created filesystem for recovery");
1275                 goto out;
1276         }
1277
1278         if (flags & OPEN_CTREE_FS_PARTIAL)
1279                 sbflags = SBREAD_PARTIAL;
1280
1281         ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1282                         (flags & OPEN_CTREE_NO_DEVICES));
1283         if (ret)
1284                 goto out;
1285
1286         fs_info->fs_devices = fs_devices;
1287         if (flags & OPEN_CTREE_WRITES)
1288                 oflags = O_RDWR;
1289         else
1290                 oflags = O_RDONLY;
1291
1292         if (flags & OPEN_CTREE_EXCLUSIVE)
1293                 oflags |= O_EXCL;
1294
1295         ret = btrfs_open_devices(fs_devices, oflags);
1296         if (ret)
1297                 goto out;
1298
1299         disk_super = fs_info->super_copy;
1300         if (flags & OPEN_CTREE_RECOVER_SUPER)
1301                 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1302                                 sb_bytenr, SBREAD_RECOVER);
1303         else
1304                 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1305                                 sbflags);
1306         if (ret) {
1307                 printk("No valid btrfs found\n");
1308                 goto out_devices;
1309         }
1310
1311         if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1312             !fs_info->ignore_fsid_mismatch) {
1313                 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1314                 goto out_devices;
1315         }
1316
1317         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1318
1319         ret = btrfs_check_fs_compatibility(fs_info->super_copy,
1320                                            flags & OPEN_CTREE_WRITES);
1321         if (ret)
1322                 goto out_devices;
1323
1324         ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1325         if (ret)
1326                 goto out_chunk;
1327
1328         /* Chunk tree root is unable to read, return directly */
1329         if (!fs_info->chunk_root)
1330                 return fs_info;
1331
1332         eb = fs_info->chunk_root->node;
1333         read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1334                            btrfs_header_chunk_tree_uuid(eb),
1335                            BTRFS_UUID_SIZE);
1336
1337         ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1338         if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1339             !fs_info->ignore_chunk_tree_error)
1340                 goto out_chunk;
1341
1342         return fs_info;
1343
1344 out_chunk:
1345         btrfs_release_all_roots(fs_info);
1346         btrfs_cleanup_all_caches(fs_info);
1347 out_devices:
1348         btrfs_close_devices(fs_devices);
1349 out:
1350         btrfs_free_fs_info(fs_info);
1351         return NULL;
1352 }
1353
1354 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1355                                          u64 sb_bytenr, u64 root_tree_bytenr,
1356                                          u64 chunk_root_bytenr,
1357                                          unsigned flags)
1358 {
1359         int fp;
1360         int ret;
1361         struct btrfs_fs_info *info;
1362         int oflags = O_RDWR;
1363         struct stat st;
1364
1365         ret = stat(filename, &st);
1366         if (ret < 0) {
1367                 error("cannot stat '%s': %s", filename, strerror(errno));
1368                 return NULL;
1369         }
1370         if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1371                 error("not a regular file or block device: %s", filename);
1372                 return NULL;
1373         }
1374
1375         if (!(flags & OPEN_CTREE_WRITES))
1376                 oflags = O_RDONLY;
1377
1378         fp = open(filename, oflags);
1379         if (fp < 0) {
1380                 error("cannot open '%s': %s", filename, strerror(errno));
1381                 return NULL;
1382         }
1383         info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1384                                chunk_root_bytenr, flags);
1385         close(fp);
1386         return info;
1387 }
1388
1389 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1390                               unsigned flags)
1391 {
1392         struct btrfs_fs_info *info;
1393
1394         /* This flags may not return fs_info with any valid root */
1395         BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1396         info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1397         if (!info)
1398                 return NULL;
1399         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1400                 return info->chunk_root;
1401         return info->fs_root;
1402 }
1403
1404 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1405                                  unsigned flags)
1406 {
1407         struct btrfs_fs_info *info;
1408
1409         /* This flags may not return fs_info with any valid root */
1410         BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1411         info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1412         if (!info)
1413                 return NULL;
1414         if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1415                 return info->chunk_root;
1416         return info->fs_root;
1417 }
1418
1419 /*
1420  * Check if the super is valid:
1421  * - nodesize/sectorsize - minimum, maximum, alignment
1422  * - tree block starts   - alignment
1423  * - number of devices   - something sane
1424  * - sys array size      - maximum
1425  */
1426 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1427 {
1428         char result[BTRFS_CSUM_SIZE];
1429         u32 crc;
1430         u16 csum_type;
1431         int csum_size;
1432
1433         if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1434                 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1435                         if (!(sbflags & SBREAD_PARTIAL)) {
1436                                 error("superblock magic doesn't match");
1437                                 return -EIO;
1438                         }
1439                 }
1440         }
1441
1442         csum_type = btrfs_super_csum_type(sb);
1443         if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1444                 error("unsupported checksum algorithm %u", csum_type);
1445                 return -EIO;
1446         }
1447         csum_size = btrfs_csum_sizes[csum_type];
1448
1449         crc = ~(u32)0;
1450         crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1451                               BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1452         btrfs_csum_final(crc, result);
1453
1454         if (memcmp(result, sb->csum, csum_size)) {
1455                 error("superblock checksum mismatch");
1456                 return -EIO;
1457         }
1458         if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1459                 error("tree_root level too big: %d >= %d",
1460                         btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1461                 goto error_out;
1462         }
1463         if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1464                 error("chunk_root level too big: %d >= %d",
1465                         btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1466                 goto error_out;
1467         }
1468         if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1469                 error("log_root level too big: %d >= %d",
1470                         btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1471                 goto error_out;
1472         }
1473
1474         if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1475                 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1476                 goto error_out;
1477         }
1478         if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1479                 error("chunk_root block unaligned: %llu",
1480                         btrfs_super_chunk_root(sb));
1481                 goto error_out;
1482         }
1483         if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1484                 error("log_root block unaligned: %llu",
1485                         btrfs_super_log_root(sb));
1486                 goto error_out;
1487         }
1488         if (btrfs_super_nodesize(sb) < 4096) {
1489                 error("nodesize too small: %u < 4096",
1490                         btrfs_super_nodesize(sb));
1491                 goto error_out;
1492         }
1493         if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1494                 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1495                 goto error_out;
1496         }
1497         if (btrfs_super_sectorsize(sb) < 4096) {
1498                 error("sectorsize too small: %u < 4096",
1499                         btrfs_super_sectorsize(sb));
1500                 goto error_out;
1501         }
1502         if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1503                 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1504                 goto error_out;
1505         }
1506         if (btrfs_super_total_bytes(sb) == 0) {
1507                 error("invalid total_bytes 0");
1508                 goto error_out;
1509         }
1510         if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1511                 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1512                 goto error_out;
1513         }
1514         if ((btrfs_super_stripesize(sb) != 4096)
1515                 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1516                 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1517                 goto error_out;
1518         }
1519
1520         if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1521                 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1522                 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1523
1524                 uuid_unparse(sb->fsid, fsid);
1525                 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1526                 error("dev_item UUID does not match fsid: %s != %s",
1527                         dev_fsid, fsid);
1528                 goto error_out;
1529         }
1530
1531         /*
1532          * Hint to catch really bogus numbers, bitflips or so
1533          */
1534         if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1535                 warning("suspicious number of devices: %llu",
1536                         btrfs_super_num_devices(sb));
1537         }
1538
1539         if (btrfs_super_num_devices(sb) == 0) {
1540                 error("number of devices is 0");
1541                 goto error_out;
1542         }
1543
1544         /*
1545          * Obvious sys_chunk_array corruptions, it must hold at least one key
1546          * and one chunk
1547          */
1548         if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1549                 error("system chunk array too big %u > %u",
1550                       btrfs_super_sys_array_size(sb),
1551                       BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1552                 goto error_out;
1553         }
1554         if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1555                         + sizeof(struct btrfs_chunk)) {
1556                 error("system chunk array too small %u < %lu",
1557                       btrfs_super_sys_array_size(sb),
1558                       sizeof(struct btrfs_disk_key) +
1559                       sizeof(struct btrfs_chunk));
1560                 goto error_out;
1561         }
1562
1563         return 0;
1564
1565 error_out:
1566         error("superblock checksum matches but it has invalid members");
1567         return -EIO;
1568 }
1569
1570 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1571                          unsigned sbflags)
1572 {
1573         u8 fsid[BTRFS_FSID_SIZE];
1574         int fsid_is_initialized = 0;
1575         char tmp[BTRFS_SUPER_INFO_SIZE];
1576         struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1577         int i;
1578         int ret;
1579         int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1580         u64 transid = 0;
1581         u64 bytenr;
1582
1583         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1584                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1585                 if (ret < BTRFS_SUPER_INFO_SIZE)
1586                         return -1;
1587
1588                 if (btrfs_super_bytenr(buf) != sb_bytenr)
1589                         return -1;
1590
1591                 if (check_super(buf, sbflags))
1592                         return -1;
1593                 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1594                 return 0;
1595         }
1596
1597         /*
1598         * we would like to check all the supers, but that would make
1599         * a btrfs mount succeed after a mkfs from a different FS.
1600         * So, we need to add a special mount option to scan for
1601         * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1602         */
1603
1604         for (i = 0; i < max_super; i++) {
1605                 bytenr = btrfs_sb_offset(i);
1606                 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1607                 if (ret < BTRFS_SUPER_INFO_SIZE)
1608                         break;
1609
1610                 if (btrfs_super_bytenr(buf) != bytenr )
1611                         continue;
1612                 /* if magic is NULL, the device was removed */
1613                 if (btrfs_super_magic(buf) == 0 && i == 0)
1614                         break;
1615                 if (check_super(buf, sbflags))
1616                         continue;
1617
1618                 if (!fsid_is_initialized) {
1619                         memcpy(fsid, buf->fsid, sizeof(fsid));
1620                         fsid_is_initialized = 1;
1621                 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1622                         /*
1623                          * the superblocks (the original one and
1624                          * its backups) contain data of different
1625                          * filesystems -> the super cannot be trusted
1626                          */
1627                         continue;
1628                 }
1629
1630                 if (btrfs_super_generation(buf) > transid) {
1631                         memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1632                         transid = btrfs_super_generation(buf);
1633                 }
1634         }
1635
1636         return transid > 0 ? 0 : -1;
1637 }
1638
1639 static int write_dev_supers(struct btrfs_root *root,
1640                             struct btrfs_super_block *sb,
1641                             struct btrfs_device *device)
1642 {
1643         u64 bytenr;
1644         u32 crc;
1645         int i, ret;
1646
1647         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1648                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1649                 crc = ~(u32)0;
1650                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1651                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1652                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1653
1654                 /*
1655                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1656                  * zero filled, we can use it directly
1657                  */
1658                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1659                                 BTRFS_SUPER_INFO_SIZE,
1660                                 root->fs_info->super_bytenr);
1661                 if (ret != BTRFS_SUPER_INFO_SIZE)
1662                         goto write_err;
1663                 return 0;
1664         }
1665
1666         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1667                 bytenr = btrfs_sb_offset(i);
1668                 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1669                         break;
1670
1671                 btrfs_set_super_bytenr(sb, bytenr);
1672
1673                 crc = ~(u32)0;
1674                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1675                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1676                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1677
1678                 /*
1679                  * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1680                  * zero filled, we can use it directly
1681                  */
1682                 ret = pwrite64(device->fd, root->fs_info->super_copy,
1683                                 BTRFS_SUPER_INFO_SIZE, bytenr);
1684                 if (ret != BTRFS_SUPER_INFO_SIZE)
1685                         goto write_err;
1686         }
1687
1688         return 0;
1689
1690 write_err:
1691         if (ret > 0)
1692                 fprintf(stderr, "WARNING: failed to write all sb data\n");
1693         else
1694                 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1695                         strerror(errno));
1696         return ret;
1697 }
1698
1699 int write_all_supers(struct btrfs_root *root)
1700 {
1701         struct list_head *cur;
1702         struct list_head *head = &root->fs_info->fs_devices->devices;
1703         struct btrfs_device *dev;
1704         struct btrfs_super_block *sb;
1705         struct btrfs_dev_item *dev_item;
1706         int ret;
1707         u64 flags;
1708
1709         sb = root->fs_info->super_copy;
1710         dev_item = &sb->dev_item;
1711         list_for_each(cur, head) {
1712                 dev = list_entry(cur, struct btrfs_device, dev_list);
1713                 if (!dev->writeable)
1714                         continue;
1715
1716                 btrfs_set_stack_device_generation(dev_item, 0);
1717                 btrfs_set_stack_device_type(dev_item, dev->type);
1718                 btrfs_set_stack_device_id(dev_item, dev->devid);
1719                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1720                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1721                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1722                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1723                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1724                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1725                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1726
1727                 flags = btrfs_super_flags(sb);
1728                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1729
1730                 ret = write_dev_supers(root, sb, dev);
1731                 BUG_ON(ret);
1732         }
1733         return 0;
1734 }
1735
1736 int write_ctree_super(struct btrfs_trans_handle *trans,
1737                       struct btrfs_root *root)
1738 {
1739         int ret;
1740         struct btrfs_root *tree_root = root->fs_info->tree_root;
1741         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1742
1743         if (root->fs_info->readonly)
1744                 return 0;
1745
1746         btrfs_set_super_generation(root->fs_info->super_copy,
1747                                    trans->transid);
1748         btrfs_set_super_root(root->fs_info->super_copy,
1749                              tree_root->node->start);
1750         btrfs_set_super_root_level(root->fs_info->super_copy,
1751                                    btrfs_header_level(tree_root->node));
1752         btrfs_set_super_chunk_root(root->fs_info->super_copy,
1753                                    chunk_root->node->start);
1754         btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1755                                          btrfs_header_level(chunk_root->node));
1756         btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1757                                 btrfs_header_generation(chunk_root->node));
1758
1759         ret = write_all_supers(root);
1760         if (ret)
1761                 fprintf(stderr, "failed to write new super block err %d\n", ret);
1762         return ret;
1763 }
1764
1765 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1766 {
1767         int ret;
1768         struct btrfs_trans_handle *trans;
1769         struct btrfs_root *root = fs_info->tree_root;
1770
1771         if (fs_info->last_trans_committed !=
1772             fs_info->generation) {
1773                 BUG_ON(!root);
1774                 trans = btrfs_start_transaction(root, 1);
1775                 btrfs_commit_transaction(trans, root);
1776                 trans = btrfs_start_transaction(root, 1);
1777                 ret = commit_tree_roots(trans, fs_info);
1778                 BUG_ON(ret);
1779                 ret = __commit_transaction(trans, root);
1780                 BUG_ON(ret);
1781                 write_ctree_super(trans, root);
1782                 btrfs_free_transaction(root, trans);
1783         }
1784
1785         if (fs_info->finalize_on_close) {
1786                 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1787                 root->fs_info->finalize_on_close = 0;
1788                 ret = write_all_supers(root);
1789                 if (ret)
1790                         fprintf(stderr,
1791                                 "failed to write new super block err %d\n", ret);
1792         }
1793         btrfs_free_block_groups(fs_info);
1794
1795         free_fs_roots_tree(&fs_info->fs_root_tree);
1796
1797         btrfs_release_all_roots(fs_info);
1798         btrfs_close_devices(fs_info->fs_devices);
1799         btrfs_cleanup_all_caches(fs_info);
1800         btrfs_free_fs_info(fs_info);
1801         return 0;
1802 }
1803
1804 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1805                      struct extent_buffer *eb)
1806 {
1807         return clear_extent_buffer_dirty(eb);
1808 }
1809
1810 int wait_on_tree_block_writeback(struct btrfs_root *root,
1811                                  struct extent_buffer *eb)
1812 {
1813         return 0;
1814 }
1815
1816 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1817 {
1818         set_extent_buffer_dirty(eb);
1819 }
1820
1821 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1822 {
1823         int ret;
1824
1825         ret = extent_buffer_uptodate(buf);
1826         if (!ret)
1827                 return ret;
1828
1829         ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1830         return !ret;
1831 }
1832
1833 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1834 {
1835         return set_extent_buffer_uptodate(eb);
1836 }