btrfs-progs: export read_extent_data function

Export it for later btrfs-map-logical cleanup.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 2 insertions, 0 deletions

diff --git a/disk-io.h b/disk-io.h
index 2d625dab..d3e3aaac 100644
--- a/disk-io.h
+++ b/disk-io.h
@@ -69,6 +69,8 @@ struct btrfs_device;
 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 				      u32 blocksize, u64 parent_transid);
+int read_extent_data(struct btrfs_root *root, char *data, u64 logical,
+		     u64 *len, int mirror);
 void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
 			  u64 parent_transid);
 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,