| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| /* |
| * Header file for the io_uring interface. |
| * |
| * Copyright (C) 2019 Jens Axboe |
| * Copyright (C) 2019 Christoph Hellwig |
| */ |
| #ifndef LINUX_IO_URING_H |
| #define LINUX_IO_URING_H |
| |
| #include <linux/fs.h> |
| #include <linux/types.h> |
| |
| /* |
| * IO submission data structure (Submission Queue Entry) |
| */ |
| struct io_uring_sqe { |
| __u8 opcode; /* type of operation for this sqe */ |
| __u8 flags; /* as of now unused */ |
| __u16 ioprio; /* ioprio for the request */ |
| __s32 fd; /* file descriptor to do IO on */ |
| __u64 off; /* offset into file */ |
| __u64 addr; /* pointer to buffer or iovecs */ |
| __u32 len; /* buffer size or number of iovecs */ |
| union { |
| __kernel_rwf_t rw_flags; |
| __u32 __resv; |
| }; |
| __u64 user_data; /* data to be passed back at completion time */ |
| __u64 __pad2[3]; |
| }; |
| |
| #define IORING_OP_NOP 0 |
| #define IORING_OP_READV 1 |
| #define IORING_OP_WRITEV 2 |
| |
| /* |
| * IO completion data structure (Completion Queue Entry) |
| */ |
| struct io_uring_cqe { |
| __u64 user_data; /* sqe->data submission passed back */ |
| __s32 res; /* result code for this event */ |
| __u32 flags; |
| }; |
| |
| /* |
| * Magic offsets for the application to mmap the data it needs |
| */ |
| #define IORING_OFF_SQ_RING 0ULL |
| #define IORING_OFF_CQ_RING 0x8000000ULL |
| #define IORING_OFF_SQES 0x10000000ULL |
| |
| /* |
| * Filled with the offset for mmap(2) |
| */ |
| struct io_sqring_offsets { |
| __u32 head; |
| __u32 tail; |
| __u32 ring_mask; |
| __u32 ring_entries; |
| __u32 flags; |
| __u32 dropped; |
| __u32 array; |
| __u32 resv1; |
| __u64 resv2; |
| }; |
| |
| struct io_cqring_offsets { |
| __u32 head; |
| __u32 tail; |
| __u32 ring_mask; |
| __u32 ring_entries; |
| __u32 overflow; |
| __u32 cqes; |
| __u64 resv[2]; |
| }; |
| |
| /* |
| * io_uring_enter(2) flags |
| */ |
| #define IORING_ENTER_GETEVENTS (1U << 0) |
| |
| /* |
| * Passed in for io_uring_setup(2). Copied back with updated info on success |
| */ |
| struct io_uring_params { |
| __u32 sq_entries; |
| __u32 cq_entries; |
| __u32 flags; |
| __u32 resv[7]; |
| struct io_sqring_offsets sq_off; |
| struct io_cqring_offsets cq_off; |
| }; |
| |
| #endif |