Btrfs: Extent based page cache code. This uses an rbtree of extents and tests

obj-m  := btrfs.o

btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \

	   hash.o file-item.o inode-item.o inode-map.o disk-io.o \

	   transaction.o bit-radix.o inode.o file.o tree-defrag.o

	   transaction.o bit-radix.o inode.o file.o tree-defrag.o \

	   extent_map.o

#btrfs-y := ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \

#	  root-tree.o dir-item.o hash.o file-item.o inode-item.o \

#ifndef __BTRFS_I__

#define __BTRFS_I__

#include "extent_map.h"

/* in memory btrfs inode */

struct btrfs_inode {

	struct btrfs_root *root;

	struct btrfs_block_group_cache *block_group;

	struct btrfs_key location;

	struct extent_map_tree extent_tree;

	struct inode vfs_inode;

	/*

		       unsigned from, unsigned to);

int btrfs_get_block(struct inode *inode, sector_t iblock,

		    struct buffer_head *result, int create);

struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,

				    size_t page_offset, u64 start, u64 end,

				    int create);

int btrfs_update_inode(struct btrfs_trans_handle *trans,

			      struct btrfs_root *root,

			      struct inode *inode);

/* file.c */

int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);

extern struct file_operations btrfs_file_operations;

int btrfs_drop_extents(struct btrfs_trans_handle *trans,

		       struct btrfs_root *root, struct inode *inode,

			   u64 num_blocks);

int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,

			     u64 logical);

int btrfs_releasepage(struct page *page, gfp_t flags);

void btrfs_btree_balance_dirty(struct btrfs_root *root);

int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);

void btrfs_mark_buffer_dirty(struct buffer_head *bh);