btrfs: remove extent_map_tree forward declaration at extent_io.h

There's no need to do a forward declaration of struct extent_map_tree at
extent_io.h, as there are no function prototypes, inline functions or data
structures that refer to struct extent_map_tree.

So remove that forward declaration, which is not needed since commit
477a30ba5f8d ("btrfs: Sink extent_tree arguments in
try_release_extent_mapping").

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 8e5639597800a7d92b6030fa66a2f607ede039ac..3cbececc8c6ddd4544de0e75d5bdc3461a4adedf 100644 (file)
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -215,8 +215,6 @@ static inline void extent_changeset_free(struct extent_changeset *changeset)
        kfree(changeset);
 }
 
-struct extent_map_tree;
-
 int try_release_extent_mapping(struct page *page, gfp_t mask);
 int try_release_extent_buffer(struct page *page);