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Current File : /usr/include/linux/io_uring.h

/* 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;		/* IOSQE_ flags */
	__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		fsync_flags;
		__u16		poll_events;
		__u32		sync_range_flags;
		__u32		msg_flags;
		__u32		timeout_flags;
	};
	__u64	user_data;	/* data to be passed back at completion time */
	union {
		__u16	buf_index;	/* index into fixed buffers, if used */
		__u64	__pad2[3];
	};
};

/*
 * sqe->flags
 */
#define IOSQE_FIXED_FILE	(1U << 0)	/* use fixed fileset */
#define IOSQE_IO_DRAIN		(1U << 1)	/* issue after inflight IO */
#define IOSQE_IO_LINK		(1U << 2)	/* links next sqe */

/*
 * io_uring_setup() flags
 */
#define IORING_SETUP_IOPOLL	(1U << 0)	/* io_context is polled */
#define IORING_SETUP_SQPOLL	(1U << 1)	/* SQ poll thread */
#define IORING_SETUP_SQ_AFF	(1U << 2)	/* sq_thread_cpu is valid */

#define IORING_OP_NOP		0
#define IORING_OP_READV		1
#define IORING_OP_WRITEV	2
#define IORING_OP_FSYNC		3
#define IORING_OP_READ_FIXED	4
#define IORING_OP_WRITE_FIXED	5
#define IORING_OP_POLL_ADD	6
#define IORING_OP_POLL_REMOVE	7
#define IORING_OP_SYNC_FILE_RANGE	8
#define IORING_OP_SENDMSG	9
#define IORING_OP_RECVMSG	10
#define IORING_OP_TIMEOUT	11

/*
 * sqe->fsync_flags
 */
#define IORING_FSYNC_DATASYNC	(1U << 0)

/*
 * 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;
};

/*
 * sq_ring->flags
 */
#define IORING_SQ_NEED_WAKEUP	(1U << 0) /* needs io_uring_enter wakeup */

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)
#define IORING_ENTER_SQ_WAKEUP	(1U << 1)

/*
 * 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 sq_thread_cpu;
	__u32 sq_thread_idle;
	__u32 features;
	__u32 resv[4];
	struct io_sqring_offsets sq_off;
	struct io_cqring_offsets cq_off;
};

/*
 * io_uring_params->features flags
 */
#define IORING_FEAT_SINGLE_MMAP		(1U << 0)

/*
 * io_uring_register(2) opcodes and arguments
 */
#define IORING_REGISTER_BUFFERS		0
#define IORING_UNREGISTER_BUFFERS	1
#define IORING_REGISTER_FILES		2
#define IORING_UNREGISTER_FILES		3
#define IORING_REGISTER_EVENTFD		4
#define IORING_UNREGISTER_EVENTFD	5

#endif

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