Fields
opcode: IORING_OP,
flags: u8,
ioprio: u16,
fd: i32,
off: u64,
addr: u64,
len: u32,
rw_flags: u32,
user_data: u64,
buf_index: u16,
personality: u16,
splice_fd_in: i32,
__pad2: [2]u64,
opcode: IORING_OP,
flags: u8,
ioprio: u16,
fd: i32,
off: u64,
addr: u64,
len: u32,
rw_flags: u32,
user_data: u64,
buf_index: u16,
personality: u16,
splice_fd_in: i32,
__pad2: [2]u64,