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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 specic language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_LIBAPPFUSE_FUSEBUFFER_H_
#define ANDROID_LIBAPPFUSE_FUSEBUFFER_H_
#include <linux/fuse.h>
namespace android {
// The numbers came from sdcard.c.
// Maximum number of bytes to write/read in one request/one reply.
constexpr size_t kFuseMaxWrite = 256 * 1024;
constexpr size_t kFuseMaxRead = 128 * 1024;
constexpr int32_t kFuseSuccess = 0;
template<typename T, typename Header>
struct FuseMessage {
Header header;
bool Read(int fd);
bool Write(int fd) const;
private:
bool CheckHeaderLength() const;
bool CheckResult(int result, const char* operation_name) const;
};
struct FuseRequest : public FuseMessage<FuseRequest, fuse_in_header> {
union {
struct {
fuse_write_in write_in;
char write_data[kFuseMaxWrite];
};
fuse_open_in open_in;
fuse_init_in init_in;
fuse_read_in read_in;
char lookup_name[0];
};
};
struct FuseResponse : public FuseMessage<FuseResponse, fuse_out_header> {
union {
fuse_init_out init_out;
fuse_entry_out entry_out;
fuse_attr_out attr_out;
fuse_open_out open_out;
char read_data[kFuseMaxRead];
fuse_write_out write_out;
};
void Reset(uint32_t data_length, int32_t error, uint64_t unique);
void ResetHeader(uint32_t data_length, int32_t error, uint64_t unique);
};
union FuseBuffer {
FuseRequest request;
FuseResponse response;
void HandleInit();
void HandleNotImpl();
};
class FuseProxyLoop {
class IFuseProxyLoopCallback {
public:
virtual void OnMount() = 0;
virtual ~IFuseProxyLoopCallback() = default;
};
bool Start(int dev_fd, int proxy_fd, IFuseProxyLoopCallback* callback);
private:
FuseBuffer buffer_;
};
} // namespace android
#endif // ANDROID_LIBAPPFUSE_FUSEBUFFER_H_
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