mirror of
https://github.com/matrix-construct/construct
synced 2024-12-26 15:33:54 +01:00
104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_FS_IOU_H
|
|
|
|
// Public and unconditional interface for io_uring. This file is part of the
|
|
// standard include stack and available whether or not this platform is Linux
|
|
// with io_uring (>= 5.1), and whether or not it's enabled, etc. If it is not
|
|
// most of this stuff does nothing and will have null values.
|
|
|
|
extern "C"
|
|
{
|
|
struct io_uring_sqe;
|
|
}
|
|
|
|
/// Input/Output Userspace Ring buffering.
|
|
///
|
|
/// Note that fs::aio and fs::iou are never used simultaneously. If io_uring
|
|
/// is supported by both the compilation and the kernel at runtime then it
|
|
/// will be selected over AIO.
|
|
namespace ircd::fs::iou
|
|
{
|
|
struct init;
|
|
struct stats;
|
|
struct system;
|
|
struct request;
|
|
enum state :uint8_t;
|
|
|
|
// a priori
|
|
extern const bool support;
|
|
extern const size_t MAX_EVENTS;
|
|
|
|
// configuration
|
|
extern conf::item<bool> enable;
|
|
extern conf::item<size_t> max_events;
|
|
extern conf::item<size_t> max_submit;
|
|
|
|
// runtime state
|
|
extern struct stats stats;
|
|
extern struct system *system;
|
|
|
|
// util
|
|
string_view reflect(const state &);
|
|
const_iovec_view iovec(const request &);
|
|
const struct ::io_uring_sqe &sqe(const request &);
|
|
struct ::io_uring_sqe &sqe(request &);
|
|
|
|
// iterate requests
|
|
static bool for_each(const state &, const std::function<bool (const request &)> &);
|
|
static bool for_each(const std::function<bool (const request &)> &);
|
|
|
|
// count requests
|
|
static size_t count(const state &, const op &);
|
|
static size_t count(const state &);
|
|
static size_t count(const op &);
|
|
}
|
|
|
|
struct ircd::fs::iou::request
|
|
{
|
|
const fs::opts *opts {nullptr};
|
|
fs::op op {fs::op::NOOP};
|
|
std::error_code ec;
|
|
int32_t res {-1};
|
|
int32_t id {-1};
|
|
|
|
request() = default;
|
|
request(const fd &, const const_iovec_view &, const fs::opts *const &);
|
|
~request() noexcept;
|
|
};
|
|
|
|
/// Enumeration of states for a request.
|
|
enum ircd::fs::iou::state
|
|
:uint8_t
|
|
{
|
|
INVALID,
|
|
QUEUED,
|
|
SUBMITTED,
|
|
COMPLETED,
|
|
|
|
_NUM
|
|
};
|
|
|
|
/// Reuse the same stats structure as fs::aio in fs::iou
|
|
struct ircd::fs::iou::stats
|
|
:aio::stats
|
|
{
|
|
using aio::stats::stats;
|
|
};
|
|
|
|
/// Internal use; this is simply declared here for when internal headers are
|
|
/// not available for this build so a weak no-op definition can be defined.
|
|
struct ircd::fs::iou::init
|
|
{
|
|
init();
|
|
~init() noexcept;
|
|
};
|