btrfs_tree_lock
btrfs_tree_lock(b);
btrfs_tree_lock(child);
btrfs_tree_lock(cur);
btrfs_tree_lock(eb);
btrfs_tree_lock(next);
btrfs_tree_lock(next);
btrfs_tree_lock(eb);
btrfs_tree_lock(eb);
btrfs_tree_lock(path->nodes[level]);
btrfs_tree_lock(eb);
btrfs_tree_lock(eb);
btrfs_tree_lock(free_space_root->node);
btrfs_tree_lock(leaf);
btrfs_tree_lock(eb);
btrfs_tree_lock(quota_root->node);
btrfs_tree_lock(eb);
btrfs_tree_lock(eb);
btrfs_tree_lock(eb);
DEFINE_EVENT(btrfs_sleep_tree_lock, btrfs_tree_lock,