| 1 | #ifndef IO_URING_H |
| 2 | #define IO_URING_H |
| 3 | |
| 4 | #include <linux/fs.h> |
| 5 | |
| 6 | /* |
| 7 | * IO submission data structure |
| 8 | */ |
| 9 | struct io_uring_iocb { |
| 10 | u8 opcode; |
| 11 | u8 flags; |
| 12 | u16 ioprio; |
| 13 | s32 fd; |
| 14 | u64 off; |
| 15 | union { |
| 16 | void *addr; |
| 17 | u64 __pad; |
| 18 | }; |
| 19 | u32 len; |
| 20 | union { |
| 21 | __kernel_rwf_t rw_flags; |
| 22 | u32 __resv; |
| 23 | }; |
| 24 | }; |
| 25 | |
| 26 | /* |
| 27 | * io_uring_setup() flags |
| 28 | */ |
| 29 | #define IORING_SETUP_IOPOLL (1 << 0) /* io_context is polled */ |
| 30 | #define IORING_SETUP_FIXEDBUFS (1 << 1) /* IO buffers are fixed */ |
| 31 | #define IORING_SETUP_SQTHREAD (1 << 2) /* Use SQ thread */ |
| 32 | #define IORING_SETUP_SQWQ (1 << 3) /* Use SQ workqueue */ |
| 33 | #define IORING_SETUP_SQPOLL (1 << 4) /* SQ thread polls */ |
| 34 | |
| 35 | #define IORING_OP_READ 1 |
| 36 | #define IORING_OP_WRITE 2 |
| 37 | #define IORING_OP_FSYNC 3 |
| 38 | #define IORING_OP_FDSYNC 4 |
| 39 | #define IORING_OP_READ_FIXED 5 |
| 40 | #define IORING_OP_WRITE_FIXED 6 |
| 41 | |
| 42 | /* |
| 43 | * IO completion data structure |
| 44 | */ |
| 45 | struct io_uring_event { |
| 46 | __u64 index; /* what iocb this event came from */ |
| 47 | s32 res; /* result code for this event */ |
| 48 | u32 flags; |
| 49 | }; |
| 50 | |
| 51 | #define IOEV_FLAG_CACHEHIT (1 << 0) /* IO did not hit media */ |
| 52 | |
| 53 | /* |
| 54 | * Magic offsets for the application to mmap the data it needs |
| 55 | */ |
| 56 | #define IORING_OFF_SQ_RING 0ULL |
| 57 | #define IORING_OFF_CQ_RING 0x8000000ULL |
| 58 | #define IORING_OFF_IOCB 0x10000000ULL |
| 59 | |
| 60 | /* |
| 61 | * Filled with the offset for mmap(2) |
| 62 | */ |
| 63 | struct io_sqring_offsets { |
| 64 | u32 head; |
| 65 | u32 tail; |
| 66 | u32 ring_mask; |
| 67 | u32 ring_entries; |
| 68 | u32 flags; |
| 69 | u32 dropped; |
| 70 | u32 array; |
| 71 | u32 resv[3]; |
| 72 | }; |
| 73 | |
| 74 | #define IORING_SQ_NEED_WAKEUP (1 << 0) /* needs io_uring_enter wakeup */ |
| 75 | |
| 76 | struct io_cqring_offsets { |
| 77 | u32 head; |
| 78 | u32 tail; |
| 79 | u32 ring_mask; |
| 80 | u32 ring_entries; |
| 81 | u32 overflow; |
| 82 | u32 events; |
| 83 | u32 resv[4]; |
| 84 | }; |
| 85 | |
| 86 | #define IORING_ENTER_GETEVENTS (1 << 0) |
| 87 | |
| 88 | /* |
| 89 | * Passed in for io_uring_setup(2). Copied back with updated info on success |
| 90 | */ |
| 91 | struct io_uring_params { |
| 92 | u32 sq_entries; |
| 93 | u32 cq_entries; |
| 94 | u32 flags; |
| 95 | u16 sq_thread_cpu; |
| 96 | u16 resv[9]; |
| 97 | struct io_sqring_offsets sq_off; |
| 98 | struct io_cqring_offsets cq_off; |
| 99 | }; |
| 100 | |
| 101 | #endif |