fs/localfs.h

/*
Copyright 2022 The Photon Authors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

#pragma once
#include <photon/fs/filesystem.h>
#include <sys/types.h>

namespace photon {
namespace fs
{
    class IFile;
    class IFileSystem;


    const int ioengine_psync = 0;

    const int ioengine_libaio = 1;          // libaio depends on photon::libaio_wrapper_init(),
                                            // and photon::fd-events ( fd_events_init() )

    const int ioengine_posixaio = 2;        // posixaio depends on photon::fd-events ( fd_events_init() )

    const int ioengine_iouring = 3;         // depends on photon::iouring_wrapper_init()


    extern "C" IFileSystem* new_localfs_adaptor(const char* root_path = nullptr,
                                                int io_engine_type = 0);

    extern "C" IFile* new_localfile_adaptor(int fd, int io_engine_type = 0);

    extern "C" IFile* open_localfile_adaptor(const char* filename, int flags,
                                             mode_t mode = 0644, int io_engine_type = 0);

    inline __attribute__((always_inline))
    IFile* new_libaio_file_adaptor(int fd)
    {
        return new_localfile_adaptor(fd, ioengine_libaio);
    }

    inline __attribute__((always_inline))
    IFile* new_posixaio_file_adaptor(int fd)
    {
        return new_localfile_adaptor(fd, ioengine_posixaio);
    }
}
}