fcp_cmd
struct fcoe_fcp_cmd_payload fcp_cmd;
struct fcoe_fcp_cmd_payload fcp_cmd;
task->txwr_rxrd.union_ctx.fcp_cmd.opaque;
#define FCP_IOCTL_CMD _IOWR('S', 0x65, struct fcp_cmd)
struct fcp_cmd __user *arg)
struct fcp_cmd cmd;