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construct/include/ircd/fs/opts.h

47 lines
1.4 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 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_SYNC_OPTS_H
namespace ircd::fs
{
struct opts extern const opts_default;
}
/// Options common to all operations
struct ircd::fs::opts
{
/// Offset in the file.
off_t offset {0};
/// Request priority. Lower value takes priority over higher.
int8_t priority {0};
/// Submits the I/O request immediately rather than allowing IRCd to
/// queue requests for a few iterations of the ircd::ios event loop.
/// (only relevant to aio).
bool nodelay {false};
/// Determines whether this operation is conducted via AIO. If not, a
/// direct syscall is made. Using AIO will only block one ircd::ctx while
/// a direct syscall will block the thread (all contexts). If AIO is not
/// available or not enabled, or doesn't support this operation, setting
/// this has no effect.
bool aio {true};
opts(const off_t &);
opts() = default;
};
inline
ircd::fs::opts::opts(const off_t &offset)
:offset{offset}
{}