fs/btrfs/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 <linux/fs.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/crc32c.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/swap.h>
  24 #include <linux/radix-tree.h>
  25 #include <linux/writeback.h>
  26 #include <linux/buffer_head.h> // for block_sync_page
  27 #include "ctree.h"
  28 #include "disk-io.h"
  29 #include "transaction.h"
  30 #include "btrfs_inode.h"
  31
  32 #if 0
  33 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
  34 {
  35         if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
  36                 printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
  37                        (unsigned long long)extent_buffer_blocknr(buf),
  38                        (unsigned long long)btrfs_header_blocknr(buf));
  39                 return 1;
  40         }
  41         return 0;
  42 }
  43 #endif
  44
  45 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  46                                             u64 blocknr)
  47 {
  48         struct inode *btree_inode = root->fs_info->btree_inode;
  49         return find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
  50                                    blocknr * root->sectorsize,
  51                                    root->sectorsize, GFP_NOFS);
  52 }
  53
  54 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  55                                                  u64 blocknr)
  56 {
  57         struct inode *btree_inode = root->fs_info->btree_inode;
  58         return alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
  59                                    blocknr * root->sectorsize,
  60                                    root->sectorsize, GFP_NOFS);
  61 }
  62
  63 struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
  64                                     size_t page_offset, u64 start, u64 end,
  65                                     int create)
  66 {
  67         struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
  68         struct extent_map *em;
  69         int ret;
  70
  71 again:
  72         em = lookup_extent_mapping(em_tree, start, end);
  73         if (em) {
  74                 goto out;
  75         }
  76         em = alloc_extent_map(GFP_NOFS);
  77         if (!em) {
  78                 em = ERR_PTR(-ENOMEM);
  79                 goto out;
  80         }
  81         em->start = 0;
  82         em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1;
  83         em->block_start = 0;
  84         em->block_end = em->end;
  85         em->bdev = inode->i_sb->s_bdev;
  86         ret = add_extent_mapping(em_tree, em);
  87         if (ret == -EEXIST) {
  88                 free_extent_map(em);
  89                 em = NULL;
  90                 goto again;
  91         } else if (ret) {
  92                 em = ERR_PTR(ret);
  93         }
  94 out:
  95         return em;
  96 }
  97
  98 static int btree_writepage(struct page *page, struct writeback_control *wbc)
  99 {
 100         struct extent_map_tree *tree;
 101         tree = &BTRFS_I(page->mapping->host)->extent_tree;
 102         return extent_write_full_page(tree, page, btree_get_extent, wbc);
 103 }
 104 int btree_readpage(struct file *file, struct page *page)
 105 {
 106         struct extent_map_tree *tree;
 107         tree = &BTRFS_I(page->mapping->host)->extent_tree;
 108         return extent_read_full_page(tree, page, btree_get_extent);
 109 }
 110
 111 static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
 112 {
 113         struct extent_map_tree *tree;
 114         int ret;
 115
 116         BUG_ON(page->private != 1);
 117         tree = &BTRFS_I(page->mapping->host)->extent_tree;
 118         ret = try_release_extent_mapping(tree, page);
 119         if (ret == 1) {
 120                 ClearPagePrivate(page);
 121                 set_page_private(page, 0);
 122                 page_cache_release(page);
 123         }
 124         return ret;
 125 }
 126
 127 static void btree_invalidatepage(struct page *page, unsigned long offset)
 128 {
 129         struct extent_map_tree *tree;
 130         tree = &BTRFS_I(page->mapping->host)->extent_tree;
 131         extent_invalidatepage(tree, page, offset);
 132         btree_releasepage(page, GFP_NOFS);
 133 }
 134
 135 int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
 136                     char *result)
 137 {
 138         return 0;
 139 #if 0
 140         u32 crc;
 141         crc = crc32c(0, data, len);
 142         memcpy(result, &crc, BTRFS_CRC32_SIZE);
 143         return 0;
 144 #endif
 145 }
 146
 147 #if 0
 148 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 149                            int verify)
 150 {
 151         return 0;
 152         char result[BTRFS_CRC32_SIZE];
 153         int ret;
 154         struct btrfs_node *node;
 155
 156         ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
 157                               bh->b_size - BTRFS_CSUM_SIZE, result);
 158         if (ret)
 159                 return ret;
 160         if (verify) {
 161                 if (memcmp(bh->b_data, result, BTRFS_CRC32_SIZE)) {
 162                         printk("btrfs: %s checksum verify failed on %llu\n",
 163                                root->fs_info->sb->s_id,
 164                                (unsigned long long)bh_blocknr(bh));
 165                         return 1;
 166                 }
 167         } else {
 168                 node = btrfs_buffer_node(bh);
 169                 memcpy(node->header.csum, result, BTRFS_CRC32_SIZE);
 170         }
 171         return 0;
 172 }
 173 #endif
 174
 175 #if 0
 176 static int btree_writepage(struct page *page, struct writeback_control *wbc)
 177 {
 178         struct buffer_head *bh;
 179         struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
 180         struct buffer_head *head;
 181         if (!page_has_buffers(page)) {
 182                 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
 183                                         (1 << BH_Dirty)|(1 << BH_Uptodate));
 184         }
 185         head = page_buffers(page);
 186         bh = head;
 187         do {
 188                 if (buffer_dirty(bh))
 189                         csum_tree_block(root, bh, 0);
 190                 bh = bh->b_this_page;
 191         } while (bh != head);
 192         return block_write_full_page(page, btree_get_block, wbc);
 193 }
 194 #endif
 195
 196 static struct address_space_operations btree_aops = {
 197         .readpage       = btree_readpage,
 198         .writepage      = btree_writepage,
 199         .releasepage    = btree_releasepage,
 200         .invalidatepage = btree_invalidatepage,
 201         .sync_page      = block_sync_page,
 202 };
 203
 204 int readahead_tree_block(struct btrfs_root *root, u64 blocknr)
 205 {
 206         struct extent_buffer *buf = NULL;
 207         struct inode *btree_inode = root->fs_info->btree_inode;
 208         int ret = 0;
 209
 210         buf = btrfs_find_create_tree_block(root, blocknr);
 211         if (!buf)
 212                 return 0;
 213         read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
 214                                  buf, 0);
 215         free_extent_buffer(buf);
 216         return ret;
 217 }
 218
 219 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr)
 220 {
 221         struct extent_buffer *buf = NULL;
 222         struct inode *btree_inode = root->fs_info->btree_inode;
 223
 224         buf = btrfs_find_create_tree_block(root, blocknr);
 225         if (!buf)
 226                 return NULL;
 227         read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
 228                                  buf, 1);
 229         return buf;
 230 }
 231
 232 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 233                      struct extent_buffer *buf)
 234 {
 235         struct inode *btree_inode = root->fs_info->btree_inode;
 236         clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
 237         return 0;
 238 }
 239
 240 int wait_on_tree_block_writeback(struct btrfs_root *root,
 241                                  struct extent_buffer *buf)
 242 {
 243         struct inode *btree_inode = root->fs_info->btree_inode;
 244         wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
 245                                         buf);
 246         return 0;
 247 }
 248
 249 int set_tree_block_dirty(struct btrfs_root *root, struct extent_buffer *buf)
 250 {
 251         struct inode *btree_inode = root->fs_info->btree_inode;
 252         set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
 253         return 0;
 254 }
 255
 256 static int __setup_root(int blocksize,
 257                         struct btrfs_root *root,
 258                         struct btrfs_fs_info *fs_info,
 259                         u64 objectid)
 260 {
 261         root->node = NULL;
 262         root->inode = NULL;
 263         root->commit_root = NULL;
 264         root->sectorsize = blocksize;
 265         root->nodesize = blocksize;
 266         root->leafsize = blocksize;
 267         root->ref_cows = 0;
 268         root->fs_info = fs_info;
 269         root->objectid = objectid;
 270         root->last_trans = 0;
 271         root->highest_inode = 0;
 272         root->last_inode_alloc = 0;
 273         root->name = NULL;
 274         memset(&root->root_key, 0, sizeof(root->root_key));
 275         memset(&root->root_item, 0, sizeof(root->root_item));
 276         memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
 277         memset(&root->root_kobj, 0, sizeof(root->root_kobj));
 278         init_completion(&root->kobj_unregister);
 279         init_rwsem(&root->snap_sem);
 280         root->defrag_running = 0;
 281         root->defrag_level = 0;
 282         root->root_key.objectid = objectid;
 283         return 0;
 284 }
 285
 286 static int find_and_setup_root(int blocksize,
 287                                struct btrfs_root *tree_root,
 288                                struct btrfs_fs_info *fs_info,
 289                                u64 objectid,
 290                                struct btrfs_root *root)
 291 {
 292         int ret;
 293
 294         __setup_root(blocksize, root, fs_info, objectid);
 295         ret = btrfs_find_last_root(tree_root, objectid,
 296                                    &root->root_item, &root->root_key);
 297         BUG_ON(ret);
 298
 299         root->node = read_tree_block(root,
 300                                      btrfs_root_blocknr(&root->root_item));
 301         BUG_ON(!root->node);
 302         return 0;
 303 }
 304
 305 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
 306                                                struct btrfs_key *location)
 307 {
 308         struct btrfs_root *root;
 309         struct btrfs_root *tree_root = fs_info->tree_root;
 310         struct btrfs_path *path;
 311         struct extent_buffer *l;
 312         u64 highest_inode;
 313         int ret = 0;
 314
 315         root = kzalloc(sizeof(*root), GFP_NOFS);
 316         if (!root)
 317                 return ERR_PTR(-ENOMEM);
 318         if (location->offset == (u64)-1) {
 319                 ret = find_and_setup_root(fs_info->sb->s_blocksize,
 320                                           fs_info->tree_root, fs_info,
 321                                           location->objectid, root);
 322                 if (ret) {
 323                         kfree(root);
 324                         return ERR_PTR(ret);
 325                 }
 326                 goto insert;
 327         }
 328
 329         __setup_root(fs_info->sb->s_blocksize, root, fs_info,
 330                      location->objectid);
 331
 332         path = btrfs_alloc_path();
 333         BUG_ON(!path);
 334         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 335         if (ret != 0) {
 336                 if (ret > 0)
 337                         ret = -ENOENT;
 338                 goto out;
 339         }
 340         l = path->nodes[0];
 341         read_extent_buffer(l, &root->root_item,
 342                btrfs_item_ptr_offset(l, path->slots[0]),
 343                sizeof(root->root_item));
 344         ret = 0;
 345 out:
 346         btrfs_release_path(root, path);
 347         btrfs_free_path(path);
 348         if (ret) {
 349                 kfree(root);
 350                 return ERR_PTR(ret);
 351         }
 352         root->node = read_tree_block(root,
 353                                      btrfs_root_blocknr(&root->root_item));
 354         BUG_ON(!root->node);
 355 insert:
 356         root->ref_cows = 1;
 357         ret = btrfs_find_highest_inode(root, &highest_inode);
 358         if (ret == 0) {
 359                 root->highest_inode = highest_inode;
 360                 root->last_inode_alloc = highest_inode;
 361         }
 362         return root;
 363 }
 364
 365 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 366                                       struct btrfs_key *location,
 367                                       const char *name, int namelen)
 368 {
 369         struct btrfs_root *root;
 370         int ret;
 371
 372         root = radix_tree_lookup(&fs_info->fs_roots_radix,
 373                                  (unsigned long)location->objectid);
 374         if (root)
 375                 return root;
 376
 377         root = btrfs_read_fs_root_no_radix(fs_info, location);
 378         if (IS_ERR(root))
 379                 return root;
 380         ret = radix_tree_insert(&fs_info->fs_roots_radix,
 381                                 (unsigned long)root->root_key.objectid,
 382                                 root);
 383         if (ret) {
 384                 free_extent_buffer(root->node);
 385                 kfree(root);
 386                 return ERR_PTR(ret);
 387         }
 388
 389         ret = btrfs_set_root_name(root, name, namelen);
 390         if (ret) {
 391                 free_extent_buffer(root->node);
 392                 kfree(root);
 393                 return ERR_PTR(ret);
 394         }
 395
 396         ret = btrfs_sysfs_add_root(root);
 397         if (ret) {
 398                 free_extent_buffer(root->node);
 399                 kfree(root->name);
 400                 kfree(root);
 401                 return ERR_PTR(ret);
 402         }
 403
 404         ret = btrfs_find_dead_roots(fs_info->tree_root,
 405                                     root->root_key.objectid, root);
 406         BUG_ON(ret);
 407
 408         return root;
 409 }
 410
 411 struct btrfs_root *open_ctree(struct super_block *sb)
 412 {
 413         struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
 414                                                  GFP_NOFS);
 415         struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
 416                                                GFP_NOFS);
 417         struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
 418                                                 GFP_NOFS);
 419         int ret;
 420         int err = -EIO;
 421         struct btrfs_super_block *disk_super;
 422
 423         if (!extent_root || !tree_root || !fs_info) {
 424                 err = -ENOMEM;
 425                 goto fail;
 426         }
 427         init_bit_radix(&fs_info->pinned_radix);
 428         init_bit_radix(&fs_info->pending_del_radix);
 429         init_bit_radix(&fs_info->extent_map_radix);
 430         init_bit_radix(&fs_info->extent_ins_radix);
 431         INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
 432         INIT_RADIX_TREE(&fs_info->block_group_radix, GFP_KERNEL);
 433         INIT_RADIX_TREE(&fs_info->block_group_data_radix, GFP_KERNEL);
 434         INIT_LIST_HEAD(&fs_info->trans_list);
 435         INIT_LIST_HEAD(&fs_info->dead_roots);
 436         memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
 437         init_completion(&fs_info->kobj_unregister);
 438         sb_set_blocksize(sb, 4096);
 439         fs_info->running_transaction = NULL;
 440         fs_info->last_trans_committed = 0;
 441         fs_info->tree_root = tree_root;
 442         fs_info->extent_root = extent_root;
 443         fs_info->sb = sb;
 444         fs_info->btree_inode = new_inode(sb);
 445         fs_info->btree_inode->i_ino = 1;
 446         fs_info->btree_inode->i_nlink = 1;
 447         fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
 448         fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
 449         extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
 450                              fs_info->btree_inode->i_mapping,
 451                              GFP_NOFS);
 452         fs_info->do_barriers = 1;
 453         fs_info->closing = 0;
 454
 455         INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
 456         BTRFS_I(fs_info->btree_inode)->root = tree_root;
 457         memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
 458                sizeof(struct btrfs_key));
 459         insert_inode_hash(fs_info->btree_inode);
 460         mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
 461
 462         mutex_init(&fs_info->trans_mutex);
 463         mutex_init(&fs_info->fs_mutex);
 464
 465         __setup_root(sb->s_blocksize, tree_root,
 466                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 467
 468         fs_info->sb_buffer = read_tree_block(tree_root,
 469                                              BTRFS_SUPER_INFO_OFFSET /
 470                                              sb->s_blocksize);
 471
 472         if (!fs_info->sb_buffer)
 473                 goto fail_iput;
 474
 475         read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
 476                            sizeof(fs_info->super_copy));
 477
 478         read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
 479                            (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
 480                            BTRFS_FSID_SIZE);
 481         disk_super = &fs_info->super_copy;
 482         if (!btrfs_super_root(disk_super))
 483                 goto fail_sb_buffer;
 484
 485         i_size_write(fs_info->btree_inode,
 486                      btrfs_super_total_blocks(disk_super) <<
 487                      fs_info->btree_inode->i_blkbits);
 488
 489
 490         if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
 491                     sizeof(disk_super->magic))) {
 492                 printk("btrfs: valid FS not found on %s\n", sb->s_id);
 493                 goto fail_sb_buffer;
 494         }
 495         tree_root->node = read_tree_block(tree_root,
 496                                           btrfs_super_root(disk_super));
 497         if (!tree_root->node)
 498                 goto fail_sb_buffer;
 499
 500         mutex_lock(&fs_info->fs_mutex);
 501         ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info,
 502                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 503         if (ret) {
 504                 mutex_unlock(&fs_info->fs_mutex);
 505                 goto fail_tree_root;
 506         }
 507
 508         btrfs_read_block_groups(extent_root);
 509
 510         fs_info->generation = btrfs_super_generation(disk_super) + 1;
 511         mutex_unlock(&fs_info->fs_mutex);
 512         return tree_root;
 513
 514 fail_tree_root:
 515         free_extent_buffer(tree_root->node);
 516 fail_sb_buffer:
 517         free_extent_buffer(fs_info->sb_buffer);
 518 fail_iput:
 519         iput(fs_info->btree_inode);
 520 fail:
 521         kfree(extent_root);
 522         kfree(tree_root);
 523         kfree(fs_info);
 524         return ERR_PTR(err);
 525 }
 526
 527 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
 528                       *root)
 529 {
 530         int ret;
 531         struct extent_buffer *super = root->fs_info->sb_buffer;
 532         struct inode *btree_inode = root->fs_info->btree_inode;
 533
 534         set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
 535         ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
 536                                      super->start, super->len);
 537         return ret;
 538 }
 539
 540 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 541 {
 542         radix_tree_delete(&fs_info->fs_roots_radix,
 543                           (unsigned long)root->root_key.objectid);
 544         btrfs_sysfs_del_root(root);
 545         if (root->inode)
 546                 iput(root->inode);
 547         if (root->node)
 548                 free_extent_buffer(root->node);
 549         if (root->commit_root)
 550                 free_extent_buffer(root->commit_root);
 551         if (root->name)
 552                 kfree(root->name);
 553         kfree(root);
 554         return 0;
 555 }
 556
 557 static int del_fs_roots(struct btrfs_fs_info *fs_info)
 558 {
 559         int ret;
 560         struct btrfs_root *gang[8];
 561         int i;
 562
 563         while(1) {
 564                 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
 565                                              (void **)gang, 0,
 566                                              ARRAY_SIZE(gang));
 567                 if (!ret)
 568                         break;
 569                 for (i = 0; i < ret; i++)
 570                         btrfs_free_fs_root(fs_info, gang[i]);
 571         }
 572         return 0;
 573 }
 574
 575 int close_ctree(struct btrfs_root *root)
 576 {
 577         int ret;
 578         struct btrfs_trans_handle *trans;
 579         struct btrfs_fs_info *fs_info = root->fs_info;
 580
 581         fs_info->closing = 1;
 582         btrfs_transaction_flush_work(root);
 583         mutex_lock(&fs_info->fs_mutex);
 584         btrfs_defrag_dirty_roots(root->fs_info);
 585         trans = btrfs_start_transaction(root, 1);
 586         ret = btrfs_commit_transaction(trans, root);
 587         /* run commit again to  drop the original snapshot */
 588         trans = btrfs_start_transaction(root, 1);
 589         btrfs_commit_transaction(trans, root);
 590         ret = btrfs_write_and_wait_transaction(NULL, root);
 591         BUG_ON(ret);
 592         write_ctree_super(NULL, root);
 593         mutex_unlock(&fs_info->fs_mutex);
 594
 595         if (fs_info->extent_root->node)
 596                 free_extent_buffer(fs_info->extent_root->node);
 597         if (fs_info->tree_root->node)
 598                 free_extent_buffer(fs_info->tree_root->node);
 599         free_extent_buffer(fs_info->sb_buffer);
 600         truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
 601         iput(fs_info->btree_inode);
 602
 603         btrfs_free_block_groups(root->fs_info);
 604         del_fs_roots(fs_info);
 605         kfree(fs_info->extent_root);
 606         kfree(fs_info->tree_root);
 607         return 0;
 608 }
 609
 610 int btrfs_buffer_uptodate(struct extent_buffer *buf)
 611 {
 612         struct inode *btree_inode = buf->first_page->mapping->host;
 613         return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf);
 614 }
 615
 616 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
 617 {
 618         struct inode *btree_inode = buf->first_page->mapping->host;
 619         return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
 620                                           buf);
 621 }
 622
 623 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
 624 {
 625         struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
 626         u64 transid = btrfs_header_generation(buf);
 627         struct inode *btree_inode = root->fs_info->btree_inode;
 628
 629         if (transid != root->fs_info->generation) {
 630                 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
 631                         (unsigned long long)extent_buffer_blocknr(buf),
 632                         transid, root->fs_info->generation);
 633                 WARN_ON(1);
 634         }
 635         set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
 636 }
 637
 638 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
 639 {
 640         balance_dirty_pages_ratelimited_nr(
 641                         root->fs_info->btree_inode->i_mapping, nr);
 642 }