btrfs: remove btrfs_path::recurse

With my async free space cache loading patches ("btrfs: load free space
cache asynchronously") we no longer have a user of path->recurse and can
remove it.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.c

@@ -2533,7 +2533,7 @@ static struct extent_buffer *btrfs_search_slot_get_root(struct btrfs_root *root,
 		 * We don't know the level of the root node until we actually
 		 * have it read locked
 		 */
-		b = __btrfs_read_lock_root_node(root, p->recurse);
+		b = __btrfs_read_lock_root_node(root, 0);
 		level = btrfs_header_level(b);
 		if (level > write_lock_level)
 			goto out;
@@ -2802,8 +2802,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 				btrfs_tree_lock(b);
 				p->locks[level] = BTRFS_WRITE_LOCK;
 			} else {
-				__btrfs_tree_read_lock(b, BTRFS_NESTING_NORMAL,
-						       p->recurse);
+				__btrfs_tree_read_lock(b, BTRFS_NESTING_NORMAL, 0);
 				p->locks[level] = BTRFS_READ_LOCK;
 			}
 			p->nodes[level] = b;

fs/btrfs/ctree.h

@@ -374,7 +374,6 @@ struct btrfs_path {
 	unsigned int search_commit_root:1;
 	unsigned int need_commit_sem:1;
 	unsigned int skip_release_on_error:1;
-	unsigned int recurse:1;
 };
 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
 					sizeof(struct btrfs_item))