io_uring/opdef.c

File Facts

System

Linux kernel

Corpus path

io_uring/opdef.c

Extension

.c

Size

19032 bytes

Lines

882

Domain

Kernel Services

Bucket

io_uring

Inferred role

Kernel Services: implementation source

Status

source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/errno.h
• linux/fs.h
• linux/file.h
• linux/io_uring.h
• linux/io_uring/cmd.h
• io_uring.h
• opdef.h
• refs.h
• tctx.h
• sqpoll.h
• fdinfo.h
• kbuf.h
• rsrc.h
• xattr.h
• nop.h
• fs.h
• splice.h
• sync.h
• advise.h
• openclose.h
• uring_cmd.h
• epoll.h
• statx.h
• net.h
• msg_ring.h
• timeout.h
• poll.h
• cancel.h
• rw.h
• waitid.h
• futex.h

Detected Declarations

• function io_no_issue
• function io_eopnotsupp_prep
• function io_uring_op_supported
• function io_uring_optable_init

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * io_uring opcode handling table
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/io_uring.h>
#include <linux/io_uring/cmd.h>

#include "io_uring.h"
#include "opdef.h"
#include "refs.h"
#include "tctx.h"
#include "sqpoll.h"
#include "fdinfo.h"
#include "kbuf.h"
#include "rsrc.h"

#include "xattr.h"
#include "nop.h"
#include "fs.h"
#include "splice.h"
#include "sync.h"
#include "advise.h"
#include "openclose.h"
#include "uring_cmd.h"
#include "epoll.h"
#include "statx.h"
#include "net.h"
#include "msg_ring.h"
#include "timeout.h"
#include "poll.h"
#include "cancel.h"
#include "rw.h"
#include "waitid.h"
#include "futex.h"
#include "truncate.h"
#include "zcrx.h"

static int io_no_issue(struct io_kiocb *req, unsigned int issue_flags)
{
	WARN_ON_ONCE(1);
	return -ECANCELED;
}

static __maybe_unused int io_eopnotsupp_prep(struct io_kiocb *kiocb,
					     const struct io_uring_sqe *sqe)
{
	return -EOPNOTSUPP;
}

const struct io_issue_def io_issue_defs[] = {
	[IORING_OP_NOP] = {
		.audit_skip		= 1,
		.iopoll			= 1,
		.prep			= io_nop_prep,
		.issue			= io_nop,
	},
	[IORING_OP_READV] = {
		.needs_file		= 1,
		.unbound_nonreg_file	= 1,
		.pollin			= 1,
		.buffer_select		= 1,
		.plug			= 1,
		.audit_skip		= 1,
		.ioprio			= 1,
		.iopoll			= 1,
		.vectored		= 1,
		.async_size		= sizeof(struct io_async_rw),
		.prep			= io_prep_readv,
		.issue			= io_read,
	},
	[IORING_OP_WRITEV] = {
		.needs_file		= 1,
		.hash_reg_file		= 1,
		.unbound_nonreg_file	= 1,
		.pollout		= 1,
		.plug			= 1,
		.audit_skip		= 1,
		.ioprio			= 1,
		.iopoll			= 1,
		.vectored		= 1,
		.async_size		= sizeof(struct io_async_rw),
		.prep			= io_prep_writev,
		.issue			= io_write,
	},
	[IORING_OP_FSYNC] = {
		.needs_file		= 1,

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/fs.h`, `linux/file.h`, `linux/io_uring.h`, `linux/io_uring/cmd.h`, `io_uring.h`, `opdef.h`.
• Detected declarations: `function io_no_issue`, `function io_eopnotsupp_prep`, `function io_uring_op_supported`, `function io_uring_optable_init`.
• Atlas domain: Kernel Services / io_uring.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.