ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / include / linux

/* 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>
/*
 * this file is shared with liburing and that has to autodetect
 * if linux/time_types.h is available or not, it can
 * define UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H
 * if linux/time_types.h is not available
 */
#ifndef UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H
#include <linux/time_types.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

/*
 * 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;
		struct {
			__u32	cmd_op;
			__u32	__pad1;
		};
	};
	union {
		__u64	addr;	/* pointer to buffer or iovecs */
		__u64	splice_off_in;
		struct {
			__u32	level;
			__u32	optname;
		};
	};
	__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;
		__u32		rename_flags;
		__u32		unlink_flags;
		__u32		hardlink_flags;
		__u32		xattr_flags;
		__u32		msg_ring_flags;
		__u32		uring_cmd_flags;
		__u32		waitid_flags;
		__u32		futex_flags;
		__u32		install_fd_flags;
		__u32		nop_flags;
	};
	__u64	user_data;	/* data to be passed back at completion time */
	/* 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;
	union {
		__s32	splice_fd_in;
		__u32	file_index;
		__u32	optlen;
		struct {
			__u16	addr_len;
			__u16	__pad3[1];
		};
	};
	union {
		struct {
			__u64	addr3;
			__u64	__pad2[1];
		};
		__u64	optval;
		/*
		 * If the ring is initialized with IORING_SETUP_SQE128, then
		 * this field is used for 80 bytes of arbitrary command data
		 */
		__u8	cmd[0];
	};
};

/*
 * If sqe->file_index is set to this for opcodes that instantiate a new
 * direct descriptor (like openat/openat2/accept), then io_uring will allocate
 * an available direct descriptor instead of having the application pass one
 * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE
 * if the space is full.
 */
#define IORING_FILE_INDEX_ALLOC		(~0U)

enum io_uring_sqe_flags_bit {
	IOSQE_FIXED_FILE_BIT,
	IOSQE_IO_DRAIN_BIT,
	IOSQE_IO_LINK_BIT,
	IOSQE_IO_HARDLINK_BIT,
	IOSQE_ASYNC_BIT,
	IOSQE_BUFFER_SELECT_BIT,
	IOSQE_CQE_SKIP_SUCCESS_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)
/* don't post CQE if request succeeded */
#define IOSQE_CQE_SKIP_SUCCESS	(1U << IOSQE_CQE_SKIP_SUCCESS_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 */
#define IORING_SETUP_R_DISABLED	(1U << 6)	/* start with ring disabled */
#define IORING_SETUP_SUBMIT_ALL	(1U << 7)	/* continue submit on error */
/*
 * Cooperative task running. When requests complete, they often require
 * forcing the submitter to transition to the kernel to complete. If this
 * flag is set, work will be done when the task transitions anyway, rather
 * than force an inter-processor interrupt reschedule. This avoids interrupting
 * a task running in userspace, and saves an IPI.
 */
#define IORING_SETUP_COOP_TASKRUN	(1U << 8)
/*
 * If COOP_TASKRUN is set, get notified if task work is available for
 * running and a kernel transition would be needed to run it. This sets
 * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
 */
#define IORING_SETUP_TASKRUN_FLAG	(1U << 9)
#define IORING_SETUP_SQE128		(1U << 10) /* SQEs are 128 byte */
#define IORING_SETUP_CQE32		(1U << 11) /* CQEs are 32 byte */
/*
 * Only one task is allowed to submit requests
 */
#define IORING_SETUP_SINGLE_ISSUER	(1U << 12)

/*
 * Defer running task work to get events.
 * Rather than running bits of task work whenever the task transitions
 * try to do it just before it is needed.
 */
#define IORING_SETUP_DEFER_TASKRUN	(1U << 13)

/*
 * Application provides the memory for the rings
 */
#define IORING_SETUP_NO_MMAP		(1U << 14)

/*
 * Register the ring fd in itself for use with
 * IORING_REGISTER_USE_REGISTERED_RING; return a registered fd index rather
 * than an fd.
 */
#define IORING_SETUP_REGISTERED_FD_ONLY	(1U << 15)

/*
 * Removes indirection through the SQ index array.
 */
#define IORING_SETUP_NO_SQARRAY		(1U << 16)

enum io_uring_op {
	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,
	IORING_OP_SHUTDOWN,
	IORING_OP_RENAMEAT,
	IORING_OP_UNLINKAT,
	IORING_OP_MKDIRAT,
	IORING_OP_SYMLINKAT,
	IORING_OP_LINKAT,
	IORING_OP_MSG_RING,
	IORING_OP_FSETXATTR,
	IORING_OP_SETXATTR,
	IORING_OP_FGETXATTR,
	IORING_OP_GETXATTR,
	IORING_OP_SOCKET,
	IORING_OP_URING_CMD,
	IORING_OP_SEND_ZC,
	IORING_OP_SENDMSG_ZC,
	IORING_OP_READ_MULTISHOT,
	IORING_OP_WAITID,
	IORING_OP_FUTEX_WAIT,
	IORING_OP_FUTEX_WAKE,
	IORING_OP_FUTEX_WAITV,
	IORING_OP_FIXED_FD_INSTALL,
	IORING_OP_FTRUNCATE,

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

/*
 * sqe->uring_cmd_flags		top 8bits aren't available for userspace
 * IORING_URING_CMD_FIXED	use registered buffer; pass this flag
 *				along with setting sqe->buf_index.
 */
#define IORING_URING_CMD_FIXED	(1U << 0)
#define IORING_URING_CMD_MASK	IORING_URING_CMD_FIXED

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

/*
 * sqe->timeout_flags
 */
#define IORING_TIMEOUT_ABS		(1U << 0)
#define IORING_TIMEOUT_UPDATE		(1U << 1)
#define IORING_TIMEOUT_BOOTTIME		(1U << 2)
#define IORING_TIMEOUT_REALTIME		(1U << 3)
#define IORING_LINK_TIMEOUT_UPDATE	(1U << 4)
#define IORING_TIMEOUT_ETIME_SUCCESS	(1U << 5)
#define IORING_TIMEOUT_MULTISHOT	(1U << 6)
#define IORING_TIMEOUT_CLOCK_MASK	(IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME)
#define IORING_TIMEOUT_UPDATE_MASK	(IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE)
/*
 * sqe->splice_flags
 * extends splice(2) flags
 */
#define SPLICE_F_FD_IN_FIXED	(1U << 31) /* the last bit of __u32 */

/*
 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the
 * command flags for POLL_ADD are stored in sqe->len.
 *
 * IORING_POLL_ADD_MULTI	Multishot poll. Sets IORING_CQE_F_MORE if
 *				the poll handler will continue to report
 *				CQEs on behalf of the same SQE.
 *
 * IORING_POLL_UPDATE		Update existing poll request, matching
 *				sqe->addr as the old user_data field.
 *
 * IORING_POLL_LEVEL		Level triggered poll.
 */
#define IORING_POLL_ADD_MULTI	(1U << 0)
#define IORING_POLL_UPDATE_EVENTS	(1U << 1)
#define IORING_POLL_UPDATE_USER_DATA	(1U << 2)
#define IORING_POLL_ADD_LEVEL		(1U << 3)

/*
 * ASYNC_CANCEL flags.
 *
 * IORING_ASYNC_CANCEL_ALL	Cancel all requests that match the given key
 * IORING_ASYNC_CANCEL_FD	Key off 'fd' for cancelation rather than the
 *				request 'user_data'
 * IORING_ASYNC_CANCEL_ANY	Match any request
 * IORING_ASYNC_CANCEL_FD_FIXED	'fd' passed in is a fixed descriptor
 * IORING_ASYNC_CANCEL_USERDATA	Match on user_data, default for no other key
 * IORING_ASYNC_CANCEL_OP	Match request based on opcode
 */
#define IORING_ASYNC_CANCEL_ALL	(1U << 0)
#define IORING_ASYNC_CANCEL_FD	(1U << 1)
#define IORING_ASYNC_CANCEL_ANY	(1U << 2)
#define IORING_ASYNC_CANCEL_FD_FIXED	(1U << 3)
#define IORING_ASYNC_CANCEL_USERDATA	(1U << 4)
#define IORING_ASYNC_CANCEL_OP	(1U << 5)

/*
 * send/sendmsg and recv/recvmsg flags (sqe->ioprio)
 *
 * IORING_RECVSEND_POLL_FIRST	If set, instead of first attempting to send
 *				or receive and arm poll if that yields an
 *				-EAGAIN result, arm poll upfront and skip
 *				the initial transfer attempt.
 *
 * IORING_RECV_MULTISHOT	Multishot recv. Sets IORING_CQE_F_MORE if
 *				the handler will continue to report
 *				CQEs on behalf of the same SQE.
 *
 * IORING_RECVSEND_FIXED_BUF	Use registered buffers, the index is stored in
 *				the buf_index field.
 *
 * IORING_SEND_ZC_REPORT_USAGE
 *				If set, SEND[MSG]_ZC should report
 *				the zerocopy usage in cqe.res
 *				for the IORING_CQE_F_NOTIF cqe.
 *				0 is reported if zerocopy was actually possible.
 *				IORING_NOTIF_USAGE_ZC_COPIED if data was copied
 *				(at least partially).
 *
 * IORING_RECVSEND_BUNDLE	Used with IOSQE_BUFFER_SELECT. If set, send or
 *				recv will grab as many buffers from the buffer
 *				group ID given and send them all. The completion
 *				result 	will be the number of buffers send, with
 *				the starting buffer ID in cqe->flags as per
 *				usual for provided buffer usage. The buffers
 *				will be	contigious from the starting buffer ID.
 */
#define IORING_RECVSEND_POLL_FIRST	(1U << 0)
#define IORING_RECV_MULTISHOT		(1U << 1)
#define IORING_RECVSEND_FIXED_BUF	(1U << 2)
#define IORING_SEND_ZC_REPORT_USAGE	(1U << 3)
#define IORING_RECVSEND_BUNDLE		(1U << 4)

/*
 * cqe.res for IORING_CQE_F_NOTIF if
 * IORING_SEND_ZC_REPORT_USAGE was requested
 *
 * It should be treated as a flag, all other
 * bits of cqe.res should be treated as reserved!
 */
#define IORING_NOTIF_USAGE_ZC_COPIED    (1U << 31)

/*
 * accept flags stored in sqe->ioprio
 */
#define IORING_ACCEPT_MULTISHOT	(1U << 0)
#define IORING_ACCEPT_DONTWAIT	(1U << 1)
#define IORING_ACCEPT_POLL_FIRST	(1U << 2)

/*
 * IORING_OP_MSG_RING command types, stored in sqe->addr
 */
enum io_uring_msg_ring_flags {
	IORING_MSG_DATA,	/* pass sqe->len as 'res' and off as user_data */
	IORING_MSG_SEND_FD,	/* send a registered fd to another ring */
};

/*
 * IORING_OP_MSG_RING flags (sqe->msg_ring_flags)
 *
 * IORING_MSG_RING_CQE_SKIP	Don't post a CQE to the target ring. Not
 *				applicable for IORING_MSG_DATA, obviously.
 */
#define IORING_MSG_RING_CQE_SKIP	(1U << 0)
/* Pass through the flags from sqe->file_index to cqe->flags */
#define IORING_MSG_RING_FLAGS_PASS	(1U << 1)

/*
 * IORING_OP_FIXED_FD_INSTALL flags (sqe->install_fd_flags)
 *
 * IORING_FIXED_FD_NO_CLOEXEC	Don't mark the fd as O_CLOEXEC
 */
#define IORING_FIXED_FD_NO_CLOEXEC	(1U << 0)

/*
 * IORING_OP_NOP flags (sqe->nop_flags)
 *
 * IORING_NOP_INJECT_RESULT	Inject result from sqe->result
 */
#define IORING_NOP_INJECT_RESULT	(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;

/*
	 * If the ring is initialized with IORING_SETUP_CQE32, then this field
	 * contains 16-bytes of padding, doubling the size of the CQE.
	 */
	__u64 big_cqe[];
};

/*
 * cqe->flags
 *
 * IORING_CQE_F_BUFFER	If set, the upper 16 bits are the buffer ID
 * IORING_CQE_F_MORE	If set, parent SQE will generate more CQE entries
 * IORING_CQE_F_SOCK_NONEMPTY	If set, more data to read after socket recv
 * IORING_CQE_F_NOTIF	Set for notification CQEs. Can be used to distinct
 * 			them from sends.
 */
#define IORING_CQE_F_BUFFER		(1U << 0)
#define IORING_CQE_F_MORE		(1U << 1)
#define IORING_CQE_F_SOCK_NONEMPTY	(1U << 2)
#define IORING_CQE_F_NOTIF		(1U << 3)

#define 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
#define IORING_OFF_PBUF_RING		0x80000000ULL
#define IORING_OFF_PBUF_SHIFT		16
#define IORING_OFF_MMAP_MASK		0xf8000000ULL

/*
 * 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 user_addr;
};

/*
 * 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 */
#define IORING_SQ_TASKRUN	(1U << 2) /* task should enter the kernel */

struct io_cqring_offsets {
	__u32 head;
	__u32 tail;
	__u32 ring_mask;
	__u32 ring_entries;
	__u32 overflow;
	__u32 cqes;
	__u32 flags;
	__u32 resv1;
	__u64 user_addr;
};

/*
 * 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)
#define IORING_ENTER_SQ_WAIT		(1U << 2)
#define IORING_ENTER_EXT_ARG		(1U << 3)
#define IORING_ENTER_REGISTERED_RING	(1U << 4)

/*
 * 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)
#define IORING_FEAT_SQPOLL_NONFIXED	(1U << 7)
#define IORING_FEAT_EXT_ARG		(1U << 8)
#define IORING_FEAT_NATIVE_WORKERS	(1U << 9)
#define IORING_FEAT_RSRC_TAGS		(1U << 10)
#define IORING_FEAT_CQE_SKIP		(1U << 11)
#define IORING_FEAT_LINKED_FILE		(1U << 12)
#define IORING_FEAT_REG_REG_RING	(1U << 13)
#define IORING_FEAT_RECVSEND_BUNDLE	(1U << 14)

/*
 * io_uring_register(2) opcodes and arguments
 */
enum io_uring_register_op {
	IORING_REGISTER_BUFFERS			= 0,
	IORING_UNREGISTER_BUFFERS		= 1,
	IORING_REGISTER_FILES			= 2,
	IORING_UNREGISTER_FILES			= 3,
	IORING_REGISTER_EVENTFD			= 4,
	IORING_UNREGISTER_EVENTFD		= 5,
	IORING_REGISTER_FILES_UPDATE		= 6,
	IORING_REGISTER_EVENTFD_ASYNC		= 7,
	IORING_REGISTER_PROBE			= 8,
	IORING_REGISTER_PERSONALITY		= 9,
	IORING_UNREGISTER_PERSONALITY		= 10,
	IORING_REGISTER_RESTRICTIONS		= 11,
	IORING_REGISTER_ENABLE_RINGS		= 12,

/* extended with tagging */
	IORING_REGISTER_FILES2			= 13,
	IORING_REGISTER_FILES_UPDATE2		= 14,
	IORING_REGISTER_BUFFERS2		= 15,
	IORING_REGISTER_BUFFERS_UPDATE		= 16,

/* set/clear io-wq thread affinities */
	IORING_REGISTER_IOWQ_AFF		= 17,
	IORING_UNREGISTER_IOWQ_AFF		= 18,

/* set/get max number of io-wq workers */
	IORING_REGISTER_IOWQ_MAX_WORKERS	= 19,

/* register/unregister io_uring fd with the ring */
	IORING_REGISTER_RING_FDS		= 20,
	IORING_UNREGISTER_RING_FDS		= 21,

/* register ring based provide buffer group */
	IORING_REGISTER_PBUF_RING		= 22,
	IORING_UNREGISTER_PBUF_RING		= 23,

/* sync cancelation API */
	IORING_REGISTER_SYNC_CANCEL		= 24,

/* register a range of fixed file slots for automatic slot allocation */
	IORING_REGISTER_FILE_ALLOC_RANGE	= 25,

/* return status information for a buffer group */
	IORING_REGISTER_PBUF_STATUS		= 26,

/* set/clear busy poll settings */
	IORING_REGISTER_NAPI			= 27,
	IORING_UNREGISTER_NAPI			= 28,

/* this goes last */
	IORING_REGISTER_LAST,

/* flag added to the opcode to use a registered ring fd */
	IORING_REGISTER_USE_REGISTERED_RING	= 1U << 31
};

/* io-wq worker categories */
enum io_wq_type {
	IO_WQ_BOUND,
	IO_WQ_UNBOUND,
};

/* deprecated, see struct io_uring_rsrc_update */
struct io_uring_files_update {
	__u32 offset;
	__u32 resv;
	__aligned_u64 /* __s32 * */ fds;
};

/*
 * Register a fully sparse file space, rather than pass in an array of all
 * -1 file descriptors.
 */
#define IORING_RSRC_REGISTER_SPARSE	(1U << 0)

struct io_uring_rsrc_register {
	__u32 nr;
	__u32 flags;
	__u64 resv2;
	__aligned_u64 data;
	__aligned_u64 tags;
};

struct io_uring_rsrc_update {
	__u32 offset;
	__u32 resv;
	__aligned_u64 data;
};

struct io_uring_rsrc_update2 {
	__u32 offset;
	__u32 resv;
	__aligned_u64 data;
	__aligned_u64 tags;
	__u32 nr;
	__u32 resv2;
};

/* Skip updating fd indexes set to this value in the fd table */
#define IORING_REGISTER_FILES_SKIP	(-2)

#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[];
};

struct io_uring_restriction {
	__u16 opcode;
	union {
		__u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */
		__u8 sqe_op;      /* IORING_RESTRICTION_SQE_OP */
		__u8 sqe_flags;   /* IORING_RESTRICTION_SQE_FLAGS_* */
	};
	__u8 resv;
	__u32 resv2[3];
};

struct io_uring_buf {
	__u64	addr;
	__u32	len;
	__u16	bid;
	__u16	resv;
};

struct io_uring_buf_ring {
	union {
		/*
		 * To avoid spilling into more pages than we need to, the
		 * ring tail is overlaid with the io_uring_buf->resv field.
		 */
		struct {
			__u64	resv1;
			__u32	resv2;
			__u16	resv3;
			__u16	tail;
		};
		__DECLARE_FLEX_ARRAY(struct io_uring_buf, bufs);
	};
};

/*
 * Flags for IORING_REGISTER_PBUF_RING.
 *
 * IOU_PBUF_RING_MMAP:	If set, kernel will allocate the memory for the ring.
 *			The application must not set a ring_addr in struct
 *			io_uring_buf_reg, instead it must subsequently call
 *			mmap(2) with the offset set as:
 *			IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT)
 *			to get a virtual mapping for the ring.
 */
enum io_uring_register_pbuf_ring_flags {
	IOU_PBUF_RING_MMAP	= 1,
};

/* argument for IORING_(UN)REGISTER_PBUF_RING */
struct io_uring_buf_reg {
	__u64	ring_addr;
	__u32	ring_entries;
	__u16	bgid;
	__u16	flags;
	__u64	resv[3];
};

/* argument for IORING_REGISTER_PBUF_STATUS */
struct io_uring_buf_status {
	__u32	buf_group;	/* input */
	__u32	head;		/* output */
	__u32	resv[8];
};

/* argument for IORING_(UN)REGISTER_NAPI */
struct io_uring_napi {
	__u32	busy_poll_to;
	__u8	prefer_busy_poll;
	__u8	pad[3];
	__u64	resv;
};

/*
 * io_uring_restriction->opcode values
 */
enum io_uring_register_restriction_op {
	/* Allow an io_uring_register(2) opcode */
	IORING_RESTRICTION_REGISTER_OP		= 0,

/* Allow an sqe opcode */
	IORING_RESTRICTION_SQE_OP		= 1,

/* Allow sqe flags */
	IORING_RESTRICTION_SQE_FLAGS_ALLOWED	= 2,

/* Require sqe flags (these flags must be set on each submission) */
	IORING_RESTRICTION_SQE_FLAGS_REQUIRED	= 3,

IORING_RESTRICTION_LAST
};

struct io_uring_getevents_arg {
	__u64	sigmask;
	__u32	sigmask_sz;
	__u32	pad;
	__u64	ts;
};

/*
 * Argument for IORING_REGISTER_SYNC_CANCEL
 */
struct io_uring_sync_cancel_reg {
	__u64				addr;
	__s32				fd;
	__u32				flags;
	struct __kernel_timespec	timeout;
	__u8				opcode;
	__u8				pad[7];
	__u64				pad2[3];
};

/*
 * Argument for IORING_REGISTER_FILE_ALLOC_RANGE
 * The range is specified as [off, off + len)
 */
struct io_uring_file_index_range {
	__u32	off;
	__u32	len;
	__u64	resv;
};

struct io_uring_recvmsg_out {
	__u32 namelen;
	__u32 controllen;
	__u32 payloadlen;
	__u32 flags;
};

/*
 * Argument for IORING_OP_URING_CMD when file is a socket
 */
enum io_uring_socket_op {
	SOCKET_URING_OP_SIOCINQ		= 0,
	SOCKET_URING_OP_SIOCOUTQ,
	SOCKET_URING_OP_GETSOCKOPT,
	SOCKET_URING_OP_SETSOCKOPT,
};

#ifdef __cplusplus
}
#endif

#endif

[+] ..
[-] nfs3.h [edit]
[-] bfs_fs.h [edit]
[-] types.h [edit]
[-] vbox_err.h [edit]
[-] posix_acl.h [edit]
[-] net_tstamp.h [edit]
[-] am437x-vpfe.h [edit]
[-] atm_zatm.h [edit]
[-] pg.h [edit]
[-] rkisp1-config.h [edit]
[-] limits.h [edit]
[-] omap3isp.h [edit]
[-] kcmp.h [edit]
[-] ipmi_ssif_bmc.h [edit]
[-] atmapi.h [edit]
[+] raid
[-] fuse.h [edit]
[-] cciss_ioctl.h [edit]
[-] reiserfs_fs.h [edit]
[-] random.h [edit]
[-] taskstats.h [edit]
[+] netfilter_ipv4
[-] hpet.h [edit]
[-] time.h [edit]
[-] netfilter.h [edit]
[-] vtpm_proxy.h [edit]
[-] erspan.h [edit]
[-] media-bus-format.h [edit]
[-] dlm_plock.h [edit]
[-] ultrasound.h [edit]
[-] romfs_fs.h [edit]
[-] ipmi_bmc.h [edit]
[-] soundcard.h [edit]
[-] dcbnl.h [edit]
[-] seg6_genl.h [edit]
[-] switchtec_ioctl.h [edit]
[-] ppp-comp.h [edit]
[-] mei_uuid.h [edit]
[-] if_ether.h [edit]
[-] lp.h [edit]
[-] meye.h [edit]
[-] perf_event.h [edit]
[-] if_phonet.h [edit]
[-] pktcdvd.h [edit]
[-] cramfs_fs.h [edit]
[-] virtio_console.h [edit]
[-] termios.h [edit]
[-] mptcp_pm.h [edit]
[-] nfs_idmap.h [edit]
[-] smc_diag.h [edit]
[-] synclink.h [edit]
[-] kcov.h [edit]
[-] fiemap.h [edit]
[-] nbd-netlink.h [edit]
[-] ip_vs.h [edit]
[-] kvm_para.h [edit]
[-] pps.h [edit]
[-] uio.h [edit]
[-] jffs2.h [edit]
[-] ipv6.h [edit]
[-] ipx.h [edit]
[-] acrn.h [edit]
[-] um_timetravel.h [edit]
[+] android
[-] vsockmon.h [edit]
[-] cm4000_cs.h [edit]
[-] bcm933xx_hcs.h [edit]
[-] map_to_7segment.h [edit]
[-] tipc.h [edit]
[+] netfilter_ipv6
[-] bt-bmc.h [edit]
[-] netfilter_ipv4.h [edit]
[-] bits.h [edit]
[-] ioctl.h [edit]
[-] icmpv6.h [edit]
[+] hsi
[-] netfilter_arp.h [edit]
[-] userfaultfd.h [edit]
[-] mount.h [edit]
[-] psample.h [edit]
[-] psp-sev.h [edit]
[-] in6.h [edit]
[-] rfkill.h [edit]
[-] dns_resolver.h [edit]
[+] usb
[-] tty_flags.h [edit]
[+] mmc
[-] prctl.h [edit]
[-] cuda.h [edit]
[-] netfilter_bridge.h [edit]
[-] if_packet.h [edit]
[-] input.h [edit]
[-] if_bonding.h [edit]
[-] nfs_fs.h [edit]
[-] tipc_netlink.h [edit]
[-] phonet.h [edit]
[-] handshake.h [edit]
[-] screen_info.h [edit]
[-] if_team.h [edit]
[-] fou.h [edit]
[-] atalk.h [edit]
[-] adb.h [edit]
[-] time_types.h [edit]
[-] sync_file.h [edit]
[-] version.h [edit]
[-] pmu.h [edit]
[-] veth.h [edit]
[-] virtio_pmem.h [edit]
[-] zorro.h [edit]
[-] ethtool_netlink.h [edit]
[-] nvram.h [edit]
[-] kvm.h [edit]
[-] nl80211.h [edit]
[-] udp.h [edit]
[-] udmabuf.h [edit]
[-] fb.h [edit]
[-] atm_nicstar.h [edit]
[-] vfio_ccw.h [edit]
[-] vm_sockets_diag.h [edit]
[-] netlink.h [edit]
[-] dlmconstants.h [edit]
[-] auto_fs4.h [edit]
[-] nfs.h [edit]
[-] dqblk_xfs.h [edit]
[-] usbdevice_fs.h [edit]
[-] max2175.h [edit]
[-] matroxfb.h [edit]
[-] if_addrlabel.h [edit]
[-] in_route.h [edit]
[-] sed-opal.h [edit]
[+] can
[-] gsmmux.h [edit]
[-] fscrypt.h [edit]
[-] blktrace_api.h [edit]
[-] if_infiniband.h [edit]
[+] genwqe
[-] kdev_t.h [edit]
[-] loop.h [edit]
[-] serial.h [edit]
[-] fanotify.h [edit]
[-] edd.h [edit]
[+] spi
[-] openat2.h [edit]
[-] dlm_netlink.h [edit]
[-] udf_fs_i.h [edit]
[-] netrom.h [edit]
[-] virtio_fs.h [edit]
[-] i2c-dev.h [edit]
[-] v4l2-mediabus.h [edit]
[-] virtio_blk.h [edit]
[-] ife.h [edit]
[-] sysctl.h [edit]
[-] neighbour.h [edit]
[-] dlm_device.h [edit]
[-] media.h [edit]
[-] sonet.h [edit]
[-] wait.h [edit]
[-] aspeed-lpc-ctrl.h [edit]
[-] phantom.h [edit]
[-] signalfd.h [edit]
[-] rio_cm_cdev.h [edit]
[-] if_ltalk.h [edit]
[-] tty.h [edit]
[-] vduse.h [edit]
[-] in.h [edit]
[-] cxl_mem.h [edit]
[-] idxd.h [edit]
[-] if_link.h [edit]
[-] dm-log-userspace.h [edit]
[-] target_core_user.h [edit]
[-] virtio_gpio.h [edit]
[-] btf.h [edit]
[-] rtnetlink.h [edit]
[-] mptcp.h [edit]
[-] vhost_types.h [edit]
[-] audit.h [edit]
[-] close_range.h [edit]
[-] qnx4_fs.h [edit]
[-] tee.h [edit]
[-] mroute.h [edit]
[-] nfs4_mount.h [edit]
[-] can.h [edit]
[-] virtio_mem.h [edit]
[-] pkt_cls.h [edit]
[-] kernelcapi.h [edit]
[-] elf-fdpic.h [edit]
[-] btrfs.h [edit]
[-] dpll.h [edit]
[-] posix_types.h [edit]
[-] cn_proc.h [edit]
[-] quota.h [edit]
[-] timex.h [edit]
[+] cifs
[+] caif
[-] ethtool.h [edit]
[-] virtio_ring.h [edit]
[-] fd.h [edit]
[-] capi.h [edit]
[-] if_pppol2tp.h [edit]
[-] thermal.h [edit]
[-] igmp.h [edit]
[-] chio.h [edit]
[-] fsverity.h [edit]
[-] ncsi.h [edit]
[-] wwan.h [edit]
[-] hsr_netlink.h [edit]
[-] atm_he.h [edit]
[-] timerfd.h [edit]
[-] radeonfb.h [edit]
[-] atmclip.h [edit]
[-] pci.h [edit]
[-] coresight-stm.h [edit]
[-] cachefiles.h [edit]
[-] if_macsec.h [edit]
[-] mman.h [edit]
[-] ila.h [edit]
[-] if_plip.h [edit]
[-] swab.h [edit]
[-] atmbr2684.h [edit]
[+] netfilter_bridge
[-] binfmts.h [edit]
[-] watchdog.h [edit]
[-] rseq.h [edit]
[-] smc.h [edit]
[-] seg6_local.h [edit]
[-] pci_regs.h [edit]
[-] genetlink.h [edit]
[-] sev-guest.h [edit]
[-] atmdev.h [edit]
[-] joystick.h [edit]
[-] string.h [edit]
[-] sonypi.h [edit]
[-] netconf.h [edit]
[-] batman_adv.h [edit]
[-] arm_sdei.h [edit]
[-] keyboard.h [edit]
[-] hash_info.h [edit]
[-] nfc.h [edit]
[-] hidraw.h [edit]
[-] kfd_sysfs.h [edit]
[-] tps6594_pfsm.h [edit]
[-] virtio_snd.h [edit]
[-] sem.h [edit]
[-] gameport.h [edit]
[-] errno.h [edit]
[-] dn.h [edit]
[-] fib_rules.h [edit]
[-] mqueue.h [edit]
[-] adfs_fs.h [edit]
[-] pfkeyv2.h [edit]
[-] mmtimer.h [edit]
[-] route.h [edit]
[-] hyperv.h [edit]
[-] ivtv.h [edit]
[-] vdpa.h [edit]
[-] membarrier.h [edit]
[-] ppp-ioctl.h [edit]
[-] if_hippi.h [edit]
[-] vbox_vmmdev_types.h [edit]
[-] cryptouser.h [edit]
[-] cycx_cfm.h [edit]
[-] if_fc.h [edit]
[-] nfs4.h [edit]
[-] parport.h [edit]
[-] mrp_bridge.h [edit]
[-] vm_sockets.h [edit]
[-] watch_queue.h [edit]
[+] netfilter
[+] hdlc
[-] cgroupstats.h [edit]
[-] mdio.h [edit]
[-] nfsacl.h [edit]
[-] iommufd.h [edit]
[-] atm_idt77105.h [edit]
[-] virtio_scmi.h [edit]
[-] nsfs.h [edit]
[-] sockios.h [edit]
[-] tdx-guest.h [edit]
[-] apm_bios.h [edit]
[-] blkpg.h [edit]
[-] virtio_bt.h [edit]
[-] btrfs_tree.h [edit]
[-] netfilter_decnet.h [edit]
[-] bsg.h [edit]
[-] netfilter_ipv6.h [edit]
[-] kernel.h [edit]
[-] ptrace.h [edit]
[-] iso_fs.h [edit]
[-] kd.h [edit]
[-] patchkey.h [edit]
[-] arcfb.h [edit]
[-] signal.h [edit]
[-] virtio_pci.h [edit]
[-] tcp_metrics.h [edit]
[-] xfrm.h [edit]
[-] unistd.h [edit]
[-] if_vlan.h [edit]
[-] io_uring.h [edit]
[+] misc
[-] dma-buf.h [edit]
[-] wireguard.h [edit]
[-] remoteproc_cdev.h [edit]
[-] l2tp.h [edit]
[-] elf.h [edit]
[-] ptp_clock.h [edit]
[-] loadpin.h [edit]
[-] pr.h [edit]
[-] scif_ioctl.h [edit]
[-] videodev2.h [edit]
[-] dlm.h [edit]
[-] cciss_defs.h [edit]
[-] reiserfs_xattr.h [edit]
[-] psci.h [edit]
[-] virtio_vsock.h [edit]
[-] serio.h [edit]
[-] nfsd_netlink.h [edit]
[-] msdos_fs.h [edit]
[-] virtio_9p.h [edit]
[-] fsi.h [edit]
[+] byteorder
[-] rpl_iptunnel.h [edit]
[-] serial_core.h [edit]
[-] kfd_ioctl.h [edit]
[-] virtio_gpu.h [edit]
[-] magic.h [edit]
[-] netlink_diag.h [edit]
[-] un.h [edit]
[-] if_alg.h [edit]
[-] sysinfo.h [edit]
[-] coda.h [edit]
[-] virtio_iommu.h [edit]
[-] if_tunnel.h [edit]
[-] if_arcnet.h [edit]
[-] capability.h [edit]
[-] seg6_hmac.h [edit]
[-] if_pppox.h [edit]
[-] nitro_enclaves.h [edit]
[-] i8k.h [edit]
[-] if_slip.h [edit]
[-] ioprio.h [edit]
[-] packet_diag.h [edit]
[-] usbip.h [edit]
[-] tls.h [edit]
[-] wmi.h [edit]
[-] tcp.h [edit]
[-] qemu_fw_cfg.h [edit]
[-] pkt_sched.h [edit]
[-] landlock.h [edit]
[-] irqnr.h [edit]
[-] atmlec.h [edit]
[-] if_cablemodem.h [edit]
[-] isst_if.h [edit]
[-] const.h [edit]
[-] module.h [edit]
[-] utsname.h [edit]
[-] vmcore.h [edit]
[-] lsm.h [edit]
[-] nvme_ioctl.h [edit]
[-] if_arp.h [edit]
[-] fpga-dfl.h [edit]
[-] i2o-dev.h [edit]
[-] userio.h [edit]
[-] efs_fs_sb.h [edit]
[-] nubus.h [edit]
[-] netdevice.h [edit]
[-] if_xdp.h [edit]
[-] stm.h [edit]
[-] ipmi_msgdefs.h [edit]
[-] devlink.h [edit]
[-] zorro_ids.h [edit]
[-] inet_diag.h [edit]
[-] falloc.h [edit]
[-] psp-dbc.h [edit]
[-] virtio_rng.h [edit]
[-] fadvise.h [edit]
[-] reboot.h [edit]
[-] tiocl.h [edit]
[-] if_addr.h [edit]
[-] filter.h [edit]
[+] nfsd
[-] kexec.h [edit]
[-] mei.h [edit]
[-] f2fs.h [edit]
[+] tc_act
[-] xilinx-v4l2-controls.h [edit]
[-] gfs2_ondisk.h [edit]
[-] sctp.h [edit]
[-] uuid.h [edit]
[-] rose.h [edit]
[-] v4l2-controls.h [edit]
[-] seg6.h [edit]
[-] eventpoll.h [edit]
[-] bpf_common.h [edit]
[-] hdreg.h [edit]
[-] param.h [edit]
[-] input-event-codes.h [edit]
[-] atmppp.h [edit]
[-] unix_diag.h [edit]
[-] virtio_mmio.h [edit]
[-] serial_reg.h [edit]
[-] ppdev.h [edit]
[-] hw_breakpoint.h [edit]
[-] ipsec.h [edit]
[-] socket.h [edit]
[-] qnxtypes.h [edit]
[+] dvb
[+] surface_aggregator
[-] gen_stats.h [edit]
[-] atm_eni.h [edit]
[-] openvswitch.h [edit]
[-] resource.h [edit]
[-] ax25.h [edit]
[-] atmsap.h [edit]
[-] connector.h [edit]
[-] rds.h [edit]
[-] atmarp.h [edit]
[-] elf-em.h [edit]
[-] qrtr.h [edit]
[-] fsmap.h [edit]
[-] stat.h [edit]
[-] virtio_types.h [edit]
[-] coff.h [edit]
[-] wireless.h [edit]
[-] fs.h [edit]
[-] ip6_tunnel.h [edit]
[-] eventfd.h [edit]
[-] atmsvc.h [edit]
[-] aspeed-p2a-ctrl.h [edit]
[-] errqueue.h [edit]
[-] mpls_iptunnel.h [edit]
[-] virtio_scsi.h [edit]
[-] kernel-page-flags.h [edit]
[-] atmioc.h [edit]
[-] agpgart.h [edit]
[-] net_namespace.h [edit]
[-] virtio_input.h [edit]
[-] bpf_perf_event.h [edit]
[-] bpf.h [edit]
[-] sound.h [edit]
[-] atm_tcp.h [edit]
[-] futex.h [edit]
[-] pidfd.h [edit]
[-] sched.h [edit]
[-] snmp.h [edit]
[-] xdp_diag.h [edit]
[-] x25.h [edit]
[-] nexthop.h [edit]
[-] uleds.h [edit]
[-] cdrom.h [edit]
[-] suspend_ioctls.h [edit]
[-] firewire-constants.h [edit]
[-] pcitest.h [edit]
[-] cec.h [edit]
[-] netdev.h [edit]
[-] vfio.h [edit]
[-] inotify.h [edit]
[-] omapfb.h [edit]
[-] cec-funcs.h [edit]
[-] lirc.h [edit]
[-] mshv.h [edit]
[-] if_bridge.h [edit]
[-] seg6_iptunnel.h [edit]
[-] bpqether.h [edit]
[-] tipc_sockets_diag.h [edit]
[-] i2c.h [edit]
[-] net_shaper.h [edit]
[-] affs_hardblocks.h [edit]
[-] mtio.h [edit]
[-] seccomp.h [edit]
[-] v4l2-dv-timings.h [edit]
[-] hid.h [edit]
[-] auto_fs.h [edit]
[+] sunrpc
[-] nfs2.h [edit]
[-] keyctl.h [edit]
[-] cfm_bridge.h [edit]
[-] virtio_balloon.h [edit]
[-] rpmsg_types.h [edit]
[-] aio_abi.h [edit]
[-] memfd.h [edit]
[-] major.h [edit]
[-] toshiba.h [edit]
[-] oom.h [edit]
[-] atmmpc.h [edit]
[-] rio_mport_cdev.h [edit]
[-] selinux_netlink.h [edit]
[-] nfs_mount.h [edit]
[-] firewire-cdev.h [edit]
[-] dccp.h [edit]
[-] ndctl.h [edit]
[-] xattr.h [edit]
[+] netfilter_arp
[-] gtp.h [edit]
[-] ppp_defs.h [edit]
[-] fsl_hypervisor.h [edit]
[-] uvcvideo.h [edit]
[+] iio
[-] nilfs2_ondisk.h [edit]
[-] rxrpc.h [edit]
[-] ivtvfb.h [edit]
[-] atm.h [edit]
[-] vt.h [edit]
[-] sock_diag.h [edit]
[-] llc.h [edit]
[-] ipc.h [edit]
[-] if_ppp.h [edit]
[-] hdlc.h [edit]
[-] baycom.h [edit]
[-] v4l2-common.h [edit]
[-] vhost.h [edit]
[+] isdn
[-] virtio_i2c.h [edit]
[-] rtc.h [edit]
[-] if_eql.h [edit]
[-] v4l2-subdev.h [edit]
[-] fcntl.h [edit]
[-] batadv_packet.h [edit]
[-] if_x25.h [edit]
[-] if_tun.h [edit]
[-] nbd.h [edit]
[-] net.h [edit]
[-] ccs.h [edit]
[-] a.out.h [edit]
[-] mii.h [edit]
[-] dm-ioctl.h [edit]
[-] ip.h [edit]
[-] rpl.h [edit]
[-] personality.h [edit]
[-] stddef.h [edit]
[-] rpmsg.h [edit]
[-] vboxguest.h [edit]
[-] smiapp.h [edit]
[-] auxvec.h [edit]
[-] vfio_zdev.h [edit]
[-] minix_fs.h [edit]
[-] fdreg.h [edit]
[-] ipmi.h [edit]
[-] msg.h [edit]
[-] blkzoned.h [edit]
[-] securebits.h [edit]
[-] pfrut.h [edit]
[-] virtio_crypto.h [edit]
[-] acct.h [edit]
[-] virtio_net.h [edit]
[-] scc.h [edit]
[-] uhid.h [edit]
[-] times.h [edit]
[-] uinput.h [edit]
[-] mpls.h [edit]
[-] utime.h [edit]
[-] auto_dev-ioctl.h [edit]
[-] fsl_mc.h [edit]
[-] lwtunnel.h [edit]
[-] poll.h [edit]
[-] icmp.h [edit]
[-] virtio_pcidev.h [edit]
[-] gpio.h [edit]
[-] shm.h [edit]
[-] ipv6_route.h [edit]
[-] tipc_config.h [edit]
[-] ethtool_netlink_generated.h [edit]
[-] mroute6.h [edit]
[-] virtio_ids.h [edit]
[-] net_dropmon.h [edit]
[-] posix_acl_xattr.h [edit]
[-] bpfilter.h [edit]
[-] virtio_config.h [edit]
[-] libc-compat.h [edit]
[-] hiddev.h [edit]
[-] nilfs2_api.h [edit]
[+] sched
[+] tc_ematch
[-] hdlcdrv.h [edit]
[-] dma-heap.h [edit]
[-] kcm.h [edit]
[-] if.h [edit]
[-] if_fddi.h [edit]
[-] mempolicy.h [edit]