294 строки
6.4 KiB
C
294 строки
6.4 KiB
C
/* 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; /* compatibility */
|
|
__u32 poll32_events; /* word-reversed for BE */
|
|
__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,
|
|
IORING_OP_TEE,
|
|
|
|
/* 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 */
|
|
#define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */
|
|
|
|
struct io_cqring_offsets {
|
|
__u32 head;
|
|
__u32 tail;
|
|
__u32 ring_mask;
|
|
__u32 ring_entries;
|
|
__u32 overflow;
|
|
__u32 cqes;
|
|
__u32 flags;
|
|
__u32 resv1;
|
|
__u64 resv2;
|
|
};
|
|
|
|
/*
|
|
* cq_ring->flags
|
|
*/
|
|
|
|
/* disable eventfd notifications */
|
|
#define IORING_CQ_EVENTFD_DISABLED (1U << 0)
|
|
|
|
/*
|
|
* 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)
|
|
#define IORING_FEAT_POLL_32BITS (1U << 6)
|
|
|
|
/*
|
|
* 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
|