Btrfs: make things static and include the right headers

Shut up various sparse warnings about symbols that should be either
static or have their declarations in scope.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index be4fc30..4fcfc8b 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -23,6 +23,7 @@
 #include "locking.h"
 #include "print-tree.h"
 #include "compat.h"
+#include "tree-log.h"
 
 /* magic values for the inode_only field in btrfs_log_inode:
  *
@@ -78,7 +79,7 @@
  * tree of log tree roots.  This must be called with a tree log transaction
  * running (see start_log_trans).
  */
-int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
+static int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
 		      struct btrfs_root *root)
 {
 	struct btrfs_key key;
@@ -1934,7 +1935,7 @@
 	return ret;
 }
 
-int wait_log_commit(struct btrfs_root *log)
+static int wait_log_commit(struct btrfs_root *log)
 {
 	DEFINE_WAIT(wait);
 	u64 transid = log->fs_info->tree_log_transid;