IoUringIoOps Class — netty Architecture

Source Code

transport-classes-io_uring/src/main/java/io/netty/channel/uring/IoUringIoOps.java lines 24–484

public final class IoUringIoOps implements IoOps {

    private final byte opcode;
    private final byte flags;
    private final short ioPrio;
    private final int fd;
    private final long union1;
    private final long union2;
    private final int len;
    private final int union3;
    private final short data;
    private final short personality;
    private final short union4;
    private final int union5;
    private final long union6;

    /**
     * Create a new instance which represents the {@code io_uring_sqe} struct.
     *
     * <pre>{@code
     *  struct io_uring_sqe {
     *      __u8    opcode;    // type of operation for this sqe
     *      __u8    flags;     // IOSQE_ flags
     *      __u16   ioprio;    // ioprio for the request
     *      __s32   fd;        // file descriptor to do IO on
     *
     *      union {            // union1
     *          __u64 off;     // offset into file
     *          __u64 addr2;
     *          struct {
     *              __u32 cmd_op;
     *              __u32 __pad1;
     *          };
     *      };
     *
     *      union {             // union2
     *          __u64 addr;    // pointer to buffer or iovecs
     *          __u64 splice_off_in;
     *          struct {
     *              __u32 level;
     *              __u32 optname;
     *          };
     *      };
     *      __u32 len;        // buffer size or number of iovecs
     *
     *      union {           // union3
     *          __kernel_rwf_t rw_flags;
     *          __u32 fsync_flags;
     *          __u16 poll_events;    // compatibility
     *          __u32 poll32_events; // word-reversed for BE
     *          __u32 sync_range_flags;
     *          __u32 msg_flags;
     *          __u32 timeout_flags;
     *          __u32 accept_flags;
     *          __u32 cancel_flags;
     *          __u32 open_flags;
     *          __u32 statx_flags;
     *          __u32 fadvise_advice;
     *          __u32 splice_flags;
     *          __u32 rename_flags;
     *          __u32 unlink_flags;
     *          __u32 hardlink_flags;
     *          __u32 xeattr_flags;
     *          __u32 msg_ring_flags;
     *          __u32 uring_cmd_flags;
     *          __u32 waitid_flags;
     *          __u32 futex_flags;
     *          __u32 install_fd_flags;
     *          __u32 nop_flags;
     *      };
     *      __u64 user_data;    // data to be passed back at completion time
     *                          // pack this to avoid bogus arm OABI complaints
     *
     *      union {             // union4
     *
     *          // index into fixed buffers, if used
     *          __u16 buf_index;
     *          // for grouped buffer selection
     *          __u16 buf_group;
     *      }__attribute__((packed));
     *      // personality to use, if used