btrfs_swapfile_pin
struct btrfs_swapfile_pin *sp, *entry;
entry = rb_entry(parent, struct btrfs_swapfile_pin, node);
struct btrfs_swapfile_pin *sp;
sp = rb_entry(node, struct btrfs_swapfile_pin, node);
struct btrfs_swapfile_pin *sp;
sp = rb_entry(node, struct btrfs_swapfile_pin, node);