5 * IO submission data structure
19 __kernel_rwf_t rw_flags;
25 * io_uring_setup() flags
27 #define IORING_SETUP_IOPOLL (1 << 0) /* io_context is polled */
28 #define IORING_SETUP_FIXEDBUFS (1 << 1) /* IO buffers are fixed */
29 #define IORING_SETUP_SQTHREAD (1 << 2) /* Use SQ thread */
30 #define IORING_SETUP_SQWQ (1 << 3) /* Use SQ workqueue */
31 #define IORING_SETUP_SQPOLL (1 << 4) /* SQ thread polls */
33 #define IORING_OP_READ 1
34 #define IORING_OP_WRITE 2
35 #define IORING_OP_FSYNC 3
36 #define IORING_OP_FDSYNC 4
37 #define IORING_OP_READ_FIXED 5
38 #define IORING_OP_WRITE_FIXED 6
41 * IO completion data structure
43 struct io_uring_event {
44 __u64 index; /* what iocb this event came from */
45 s32 res; /* result code for this event */
49 #define IOEV_FLAG_CACHEHIT (1 << 0) /* IO did not hit media */
52 * Magic offsets for the application to mmap the data it needs
54 #define IORING_OFF_SQ_RING 0ULL
55 #define IORING_OFF_CQ_RING 0x8000000ULL
56 #define IORING_OFF_IOCB 0x10000000ULL
59 * Filled with the offset for mmap(2)
61 struct io_sqring_offsets {
72 #define IORING_SQ_NEED_WAKEUP (1 << 0) /* needs io_uring_enter wakeup */
74 struct io_cqring_offsets {
84 #define IORING_ENTER_GETEVENTS (1 << 0)
87 * Passed in for io_uring_setup(2). Copied back with updated info on success
89 struct io_uring_params {
95 struct io_sqring_offsets sq_off;
96 struct io_cqring_offsets cq_off;