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Edit File : io_uring.h \| Size : 6.06 KB
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT / / * 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 / union { __u64 off; / offset into file / __u64 addr2; }; union { __u64 addr; / pointer to buffer or iovecs / __u64 splice_off_in; }; __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; __u32 accept_flags; __u32 cancel_flags; __u32 open_flags; __u32 statx_flags; __u32 fadvise_advice; __u32 splice_flags; }; __u64 user_data; / data to be passed back at completion time / union { struct { / pack this to avoid bogus arm OABI complaints / union { / index into fixed buffers, if used / __u16 buf_index; / for grouped buffer selection / __u16 buf_group; } __attribute__((packed)); / personality to use, if used / __u16 personality; __s32 splice_fd_in; }; __u64 __pad2[3]; }; }; enum { IOSQE_FIXED_FILE_BIT, IOSQE_IO_DRAIN_BIT, IOSQE_IO_LINK_BIT, IOSQE_IO_HARDLINK_BIT, IOSQE_ASYNC_BIT, IOSQE_BUFFER_SELECT_BIT, }; / * sqe->flags / / use fixed fileset / #define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT) / issue after inflight IO / #define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT) / links next sqe / #define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT) / like LINK, but stronger / #define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT) / always go async / #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) / select buffer from sqe->buf_group / #define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT) / * 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_SETUP_CQSIZE (1U << 3) / app defines CQ size / #define IORING_SETUP_CLAMP (1U << 4) / clamp SQ/CQ ring sizes / #define IORING_SETUP_ATTACH_WQ (1U << 5) / attach to existing wq / enum { IORING_OP_NOP, IORING_OP_READV, IORING_OP_WRITEV, IORING_OP_FSYNC, IORING_OP_READ_FIXED, IORING_OP_WRITE_FIXED, IORING_OP_POLL_ADD, IORING_OP_POLL_REMOVE, IORING_OP_SYNC_FILE_RANGE, IORING_OP_SENDMSG, IORING_OP_RECVMSG, IORING_OP_TIMEOUT, IORING_OP_TIMEOUT_REMOVE, IORING_OP_ACCEPT, IORING_OP_ASYNC_CANCEL, IORING_OP_LINK_TIMEOUT, IORING_OP_CONNECT, IORING_OP_FALLOCATE, IORING_OP_OPENAT, IORING_OP_CLOSE, IORING_OP_FILES_UPDATE, IORING_OP_STATX, IORING_OP_READ, IORING_OP_WRITE, IORING_OP_FADVISE, IORING_OP_MADVISE, IORING_OP_SEND, IORING_OP_RECV, IORING_OP_OPENAT2, IORING_OP_EPOLL_CTL, IORING_OP_SPLICE, IORING_OP_PROVIDE_BUFFERS, IORING_OP_REMOVE_BUFFERS, / this goes last, obviously / IORING_OP_LAST, }; / * sqe->fsync_flags / #define IORING_FSYNC_DATASYNC (1U << 0) / * sqe->timeout_flags / #define IORING_TIMEOUT_ABS (1U << 0) / * sqe->splice_flags * extends splice(2) flags / #define SPLICE_F_FD_IN_FIXED (1U << 31) / the last bit of __u32 / / * 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; }; / * cqe->flags * * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID / #define IORING_CQE_F_BUFFER (1U << 0) enum { IORING_CQE_BUFFER_SHIFT = 16, }; / * 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 wq_fd; __u32 resv[3]; struct io_sqring_offsets sq_off; struct io_cqring_offsets cq_off; }; / * io_uring_params->features flags / #define IORING_FEAT_SINGLE_MMAP (1U << 0) #define IORING_FEAT_NODROP (1U << 1) #define IORING_FEAT_SUBMIT_STABLE (1U << 2) #define IORING_FEAT_RW_CUR_POS (1U << 3) #define IORING_FEAT_CUR_PERSONALITY (1U << 4) #define IORING_FEAT_FAST_POLL (1U << 5) / * 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 #define IORING_REGISTER_FILES_UPDATE 6 #define IORING_REGISTER_EVENTFD_ASYNC 7 #define IORING_REGISTER_PROBE 8 #define IORING_REGISTER_PERSONALITY 9 #define IORING_UNREGISTER_PERSONALITY 10 struct io_uring_files_update { __u32 offset; __u32 resv; __aligned_u64 / __s32 * / fds; }; #define IO_URING_OP_SUPPORTED (1U << 0) struct io_uring_probe_op { __u8 op; __u8 resv; __u16 flags; / IO_URING_OP_* flags / __u32 resv2; }; struct io_uring_probe { __u8 last_op; / last opcode supported / __u8 ops_len; / length of ops[] array below */ __u16 resv; __u32 resv2[3]; struct io_uring_probe_op ops[0]; }; #endif Back

Edit File : io_uring.h | Size : 6.06 KB

/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
/*
 * 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 */
	union {
		__u64	off;	/* offset into file */
		__u64	addr2;
	};
	union {
		__u64	addr;	/* pointer to buffer or iovecs */
		__u64	splice_off_in;
	};
	__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;
		__u32		accept_flags;
		__u32		cancel_flags;
		__u32		open_flags;
		__u32		statx_flags;
		__u32		fadvise_advice;
		__u32		splice_flags;
	};
	__u64	user_data;	/* data to be passed back at completion time */
	union {
		struct {
			/* pack this to avoid bogus arm OABI complaints */
			union {
				/* index into fixed buffers, if used */
				__u16	buf_index;
				/* for grouped buffer selection */
				__u16	buf_group;
			} __attribute__((packed));
			/* personality to use, if used */
			__u16	personality;
			__s32	splice_fd_in;
		};
		__u64	__pad2[3];
	};
};

enum {
	IOSQE_FIXED_FILE_BIT,
	IOSQE_IO_DRAIN_BIT,
	IOSQE_IO_LINK_BIT,
	IOSQE_IO_HARDLINK_BIT,
	IOSQE_ASYNC_BIT,
	IOSQE_BUFFER_SELECT_BIT,
};

/*
 * sqe->flags
 */
/* use fixed fileset */
#define IOSQE_FIXED_FILE	(1U << IOSQE_FIXED_FILE_BIT)
/* issue after inflight IO */
#define IOSQE_IO_DRAIN		(1U << IOSQE_IO_DRAIN_BIT)
/* links next sqe */
#define IOSQE_IO_LINK		(1U << IOSQE_IO_LINK_BIT)
/* like LINK, but stronger */
#define IOSQE_IO_HARDLINK	(1U << IOSQE_IO_HARDLINK_BIT)
/* always go async */
#define IOSQE_ASYNC		(1U << IOSQE_ASYNC_BIT)
/* select buffer from sqe->buf_group */
#define IOSQE_BUFFER_SELECT	(1U << IOSQE_BUFFER_SELECT_BIT)

/*
 * 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_SETUP_CQSIZE	(1U << 3)	/* app defines CQ size */
#define IORING_SETUP_CLAMP	(1U << 4)	/* clamp SQ/CQ ring sizes */
#define IORING_SETUP_ATTACH_WQ	(1U << 5)	/* attach to existing wq */

enum {
	IORING_OP_NOP,
	IORING_OP_READV,
	IORING_OP_WRITEV,
	IORING_OP_FSYNC,
	IORING_OP_READ_FIXED,
	IORING_OP_WRITE_FIXED,
	IORING_OP_POLL_ADD,
	IORING_OP_POLL_REMOVE,
	IORING_OP_SYNC_FILE_RANGE,
	IORING_OP_SENDMSG,
	IORING_OP_RECVMSG,
	IORING_OP_TIMEOUT,
	IORING_OP_TIMEOUT_REMOVE,
	IORING_OP_ACCEPT,
	IORING_OP_ASYNC_CANCEL,
	IORING_OP_LINK_TIMEOUT,
	IORING_OP_CONNECT,
	IORING_OP_FALLOCATE,
	IORING_OP_OPENAT,
	IORING_OP_CLOSE,
	IORING_OP_FILES_UPDATE,
	IORING_OP_STATX,
	IORING_OP_READ,
	IORING_OP_WRITE,
	IORING_OP_FADVISE,
	IORING_OP_MADVISE,
	IORING_OP_SEND,
	IORING_OP_RECV,
	IORING_OP_OPENAT2,
	IORING_OP_EPOLL_CTL,
	IORING_OP_SPLICE,
	IORING_OP_PROVIDE_BUFFERS,
	IORING_OP_REMOVE_BUFFERS,

/* this goes last, obviously */
	IORING_OP_LAST,
};

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

/*
 * sqe->timeout_flags
 */
#define IORING_TIMEOUT_ABS	(1U << 0)

/*
 * sqe->splice_flags
 * extends splice(2) flags
 */
#define SPLICE_F_FD_IN_FIXED	(1U << 31) /* the last bit of __u32 */

/*
 * 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;
};

/*
 * cqe->flags
 *
 * IORING_CQE_F_BUFFER	If set, the upper 16 bits are the buffer ID
 */
#define IORING_CQE_F_BUFFER		(1U << 0)

enum {
	IORING_CQE_BUFFER_SHIFT		= 16,
};

/*
 * 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 wq_fd;
	__u32 resv[3];
	struct io_sqring_offsets sq_off;
	struct io_cqring_offsets cq_off;
};

/*
 * io_uring_params->features flags
 */
#define IORING_FEAT_SINGLE_MMAP		(1U << 0)
#define IORING_FEAT_NODROP		(1U << 1)
#define IORING_FEAT_SUBMIT_STABLE	(1U << 2)
#define IORING_FEAT_RW_CUR_POS		(1U << 3)
#define IORING_FEAT_CUR_PERSONALITY	(1U << 4)
#define IORING_FEAT_FAST_POLL		(1U << 5)

/*
 * 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
#define IORING_REGISTER_FILES_UPDATE	6
#define IORING_REGISTER_EVENTFD_ASYNC	7
#define IORING_REGISTER_PROBE		8
#define IORING_REGISTER_PERSONALITY	9
#define IORING_UNREGISTER_PERSONALITY	10

struct io_uring_files_update {
	__u32 offset;
	__u32 resv;
	__aligned_u64 /* __s32 * */ fds;
};

#define IO_URING_OP_SUPPORTED	(1U << 0)

struct io_uring_probe_op {
	__u8 op;
	__u8 resv;
	__u16 flags;	/* IO_URING_OP_* flags */
	__u32 resv2;
};

struct io_uring_probe {
	__u8 last_op;	/* last opcode supported */
	__u8 ops_len;	/* length of ops[] array below */
	__u16 resv;
	__u32 resv2[3];
	struct io_uring_probe_op ops[0];
};

#endif

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