btrfs: add forward declarations and headers, part 2

Do a cleanup in more headers:

- add forward declarations for types referenced by pointers
- add includes when types need them

This fixes potential compilation problems if the headers are reordered
or the missing includes are not provided indirectly.

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h
index 7d6ee1e609bf..9576f485a300 100644
--- a/fs/btrfs/locking.h
+++ b/fs/btrfs/locking.h
@@ -8,8 +8,14 @@
 
 #include <linux/atomic.h>
 #include <linux/wait.h>
+#include <linux/lockdep.h>
 #include <linux/percpu_counter.h>
 #include "extent_io.h"
+#include "locking.h"
+
+struct extent_buffer;
+struct btrfs_path;
+struct btrfs_root;
 
 #define BTRFS_WRITE_LOCK 1
 #define BTRFS_READ_LOCK 2
@@ -157,8 +163,6 @@ enum btrfs_lockdep_trans_states {
 static_assert(BTRFS_NESTING_MAX <= MAX_LOCKDEP_SUBCLASSES,
 	      "too many lock subclasses defined");
 
-struct btrfs_path;
-
 void __btrfs_tree_lock(struct extent_buffer *eb, enum btrfs_lock_nesting nest);
 void btrfs_tree_lock(struct extent_buffer *eb);
 void btrfs_tree_unlock(struct extent_buffer *eb);