btrfs_update_device
ret = btrfs_update_device(trans, chunk_map->stripes[i].dev);
ret = btrfs_update_device(trans, device);
ret = btrfs_update_device(trans, map->stripes[i].dev);
ret = btrfs_update_device(trans, device);
ret = btrfs_update_device(trans, device);
int btrfs_update_device(struct btrfs_trans_handle *trans, struct btrfs_device *device);