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/***************************************************************************
* lib/io/create_file.cpp
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2002 Roman Dementiev <dementiev@mpi-sb.mpg.de>
* Copyright (C) 2008, 2010 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
* Copyright (C) 2008, 2009 Johannes Singler <singler@ira.uka.de>
* Copyright (C) 2013 Timo Bingmann <tb@panthema.net>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#include <stxxl/bits/common/error_handling.h>
#include <stxxl/bits/common/exceptions.h>
#include <stxxl/bits/io/create_file.h>
#include <stxxl/bits/io/io.h>
#include <stxxl/bits/mng/config.h>
#include <ostream>
#include <stdexcept>
STXXL_BEGIN_NAMESPACE
file * create_file(const std::string& io_impl,
const std::string& filename,
int options, int physical_device_id, int disk_allocator_id)
{
// construct temporary disk_config structure
disk_config cfg(filename, 0, io_impl);
cfg.queue = physical_device_id;
cfg.direct =
(options& file::REQUIRE_DIRECT) ? disk_config::DIRECT_ON :
(options& file::DIRECT) ? disk_config::DIRECT_TRY :
disk_config::DIRECT_OFF;
return create_file(cfg, options, disk_allocator_id);
}
file * create_file(disk_config& cfg, int mode, int disk_allocator_id)
{
// apply disk_config settings to open mode
mode &= ~(file::DIRECT | file::REQUIRE_DIRECT); // clear DIRECT and REQUIRE_DIRECT
switch (cfg.direct) {
case disk_config::DIRECT_OFF:
break;
case disk_config::DIRECT_TRY:
mode |= file::DIRECT;
break;
case disk_config::DIRECT_ON:
mode |= file::DIRECT | file::REQUIRE_DIRECT;
break;
}
// automatically enumerate disks as separate device ids
if (cfg.device_id == file::DEFAULT_DEVICE_ID)
{
cfg.device_id = config::get_instance()->get_next_device_id();
}
else
{
config::get_instance()->update_max_device_id(cfg.device_id);
}
// *** Select fileio Implementation
if (cfg.io_impl == "syscall")
{
ufs_file_base* result =
new syscall_file(cfg.path, mode, cfg.queue, disk_allocator_id,
cfg.device_id);
result->lock();
// if marked as device but file is not -> throw!
if (cfg.raw_device && !result->is_device())
{
delete result;
STXXL_THROW(io_error, "Disk " << cfg.path << " was expected to be "
"a raw block device, but it is a normal file!");
}
// if is raw_device -> get size and remove some flags.
if (result->is_device())
{
cfg.raw_device = true;
cfg.size = result->size();
cfg.autogrow = cfg.delete_on_exit = cfg.unlink_on_open = false;
}
if (cfg.unlink_on_open)
result->unlink();
return result;
}
else if (cfg.io_impl == "fileperblock_syscall")
{
fileperblock_file<syscall_file>* result =
new fileperblock_file<syscall_file>(cfg.path, mode, cfg.queue,
disk_allocator_id, cfg.device_id);
result->lock();
return result;
}
else if (cfg.io_impl == "memory")
{
mem_file* result = new mem_file(cfg.queue, disk_allocator_id, cfg.device_id);
result->lock();
return result;
}
#if STXXL_HAVE_LINUXAIO_FILE
// linuxaio can have the desired queue length, specified as queue_length=?
else if (cfg.io_impl == "linuxaio")
{
// linuxaio_queue is a singleton.
cfg.queue = file::DEFAULT_LINUXAIO_QUEUE;
ufs_file_base* result =
new linuxaio_file(cfg.path, mode, cfg.queue, disk_allocator_id,
cfg.device_id, cfg.queue_length);
result->lock();
// if marked as device but file is not -> throw!
if (cfg.raw_device && !result->is_device())
{
delete result;
STXXL_THROW(io_error, "Disk " << cfg.path << " was expected to be "
"a raw block device, but it is a normal file!");
}
// if is raw_device -> get size and remove some flags.
if (result->is_device())
{
cfg.raw_device = true;
cfg.size = result->size();
cfg.autogrow = cfg.delete_on_exit = cfg.unlink_on_open = false;
}
if (cfg.unlink_on_open)
result->unlink();
return result;
}
#endif
#if STXXL_HAVE_MMAP_FILE
else if (cfg.io_impl == "mmap")
{
ufs_file_base* result =
new mmap_file(cfg.path, mode, cfg.queue, disk_allocator_id,
cfg.device_id);
result->lock();
if (cfg.unlink_on_open)
result->unlink();
return result;
}
else if (cfg.io_impl == "fileperblock_mmap")
{
fileperblock_file<mmap_file>* result =
new fileperblock_file<mmap_file>(cfg.path, mode, cfg.queue,
disk_allocator_id, cfg.device_id);
result->lock();
return result;
}
#endif
#if STXXL_HAVE_SIMDISK_FILE
else if (cfg.io_impl == "simdisk")
{
mode &= ~(file::DIRECT | file::REQUIRE_DIRECT); // clear the DIRECT flag, this file is supposed to be on tmpfs
ufs_file_base* result =
new sim_disk_file(cfg.path, mode, cfg.queue, disk_allocator_id,
cfg.device_id);
result->lock();
return result;
}
#endif
#if STXXL_HAVE_WINCALL_FILE
else if (cfg.io_impl == "wincall")
{
wfs_file_base* result =
new wincall_file(cfg.path, mode, cfg.queue, disk_allocator_id,
cfg.device_id);
result->lock();
return result;
}
else if (cfg.io_impl == "fileperblock_wincall")
{
fileperblock_file<wincall_file>* result =
new fileperblock_file<wincall_file>(cfg.path, mode, cfg.queue,
disk_allocator_id, cfg.device_id);
result->lock();
return result;
}
#endif
#if STXXL_HAVE_BOOSTFD_FILE
else if (cfg.io_impl == "boostfd")
{
boostfd_file* result =
new boostfd_file(cfg.path, mode, cfg.queue, disk_allocator_id,
cfg.device_id);
result->lock();
return result;
}
else if (cfg.io_impl == "fileperblock_boostfd")
{
fileperblock_file<boostfd_file>* result =
new fileperblock_file<boostfd_file>(cfg.path, mode, cfg.queue,
disk_allocator_id, cfg.device_id);
result->lock();
return result;
}
#endif
#if STXXL_HAVE_WBTL_FILE
else if (cfg.io_impl == "wbtl")
{
ufs_file_base* backend =
new syscall_file(cfg.path, mode, -1, -1); // FIXME: ID
wbtl_file* result =
new stxxl::wbtl_file(backend, 16 * 1024 * 1024, 2, cfg.queue,
disk_allocator_id);
result->lock();
if (cfg.unlink_on_open)
backend->unlink();
return result;
}
#endif
STXXL_THROW(std::runtime_error,
"Unsupported disk I/O implementation '" << cfg.io_impl << "'.");
}
STXXL_END_NAMESPACE
// vim: et:ts=4:sw=4
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