btrfs_qgroup_reserve_data
ret = btrfs_qgroup_reserve_data(inode, reserved, start, len);
ret = btrfs_qgroup_reserve_data(BTRFS_I(inode), &data_reserved,
ret = btrfs_qgroup_reserve_data(BTRFS_I(inode),
ret = btrfs_qgroup_reserve_data(inode, &data_reserved, start, num_bytes);
int btrfs_qgroup_reserve_data(struct btrfs_inode *inode,
DEFINE_EVENT(btrfs__qgroup_rsv_data, btrfs_qgroup_reserve_data,