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construct/include/ircd/fs/dev.h

88 lines
2.3 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_DEV_H
namespace ircd::fs::dev
{
struct blk;
using major_minor = std::pair<ulong, ulong>;
using blk_closure = std::function<bool (const ulong &id, const blk &)>;
// Convert device ID's with the major(3) / minor(3) / makedev(3)
ulong id(const major_minor &);
major_minor id(const ulong &id);
// Convert device id integers into a string used as the directory name in sysfs(5)
string_view sysfs_id(const mutable_buffer &out, const major_minor &);
string_view sysfs_id(const mutable_buffer &out, const ulong &);
// Read data for a device from sysfs; path is relative to /sys/dev/block/$id/...
string_view sysfs(const mutable_buffer &out, const ulong &id, const string_view &path);
// Read data for a device lexical_cast'ed to type
template<class R = size_t,
size_t bufmax = 32>
R
sysfs(const ulong &id,
const string_view &path,
const R &def = 0);
bool for_each(const string_view &devtype, const blk_closure &);
bool for_each(const blk_closure &);
}
struct ircd::fs::dev::blk
{
static const size_t SECTOR_SIZE;
static const string_view BASE_PATH;
static string_view devtype(const mutable_buffer &, const ulong &id);
std::string type;
std::string vendor;
std::string model;
std::string rev;
size_t sector_size {0};
size_t physical_block {0};
size_t logical_block {0};
size_t minimum_io {0};
size_t optimal_io {0};
size_t sectors {0};
size_t queue_depth {0};
size_t nr_requests {0};
std::string scheduler;
bool rotational {false};
bool merges {false};
blk(const ulong &id);
blk() = default;
};
/// Return a lex_cast'able (an integer) from a sysfs target.
template<class T,
size_t bufmax>
T
ircd::fs::dev::sysfs(const ulong &id,
const string_view &path,
const T &def)
{
char buf[bufmax];
const string_view val
{
sysfs(buf, id, path)
};
return lex_castable<T>(val)?
lex_cast<T>(val):
def;
}