write_setup
REG(write_setup)
.write_setup = nfs3_proc_write_setup,
.write_setup = nfs4_proc_write_setup,
.write_setup = nfs_proc_write_setup,
rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client);
void (*write_setup)(struct nfs_pgio_header *, struct rpc_message *,