101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specic language governing permissions and
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* limitations under the License.
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*/
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#include "libappfuse/FuseBridgeLoop.h"
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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namespace android {
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namespace fuse {
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bool StartFuseBridgeLoop(
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int raw_dev_fd, int raw_proxy_fd, FuseBridgeLoopCallback* callback) {
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base::unique_fd dev_fd(raw_dev_fd);
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base::unique_fd proxy_fd(raw_proxy_fd);
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FuseBuffer buffer;
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size_t open_count = 0;
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LOG(DEBUG) << "Start fuse loop.";
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while (true) {
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if (!buffer.request.Read(dev_fd)) {
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return false;
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}
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const uint32_t opcode = buffer.request.header.opcode;
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LOG(VERBOSE) << "Read a fuse packet, opcode=" << opcode;
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switch (opcode) {
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case FUSE_FORGET:
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// Do not reply to FUSE_FORGET.
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continue;
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case FUSE_LOOKUP:
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case FUSE_GETATTR:
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case FUSE_OPEN:
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case FUSE_READ:
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case FUSE_WRITE:
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case FUSE_RELEASE:
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case FUSE_FSYNC:
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if (!buffer.request.Write(proxy_fd)) {
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LOG(ERROR) << "Failed to write a request to the proxy.";
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return false;
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}
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if (!buffer.response.Read(proxy_fd)) {
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LOG(ERROR) << "Failed to read a response from the proxy.";
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return false;
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}
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break;
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case FUSE_INIT:
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buffer.HandleInit();
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break;
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default:
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buffer.HandleNotImpl();
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break;
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}
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if (!buffer.response.Write(dev_fd)) {
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LOG(ERROR) << "Failed to write a response to the device.";
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return false;
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}
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switch (opcode) {
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case FUSE_INIT:
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callback->OnMount();
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break;
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case FUSE_OPEN:
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if (buffer.response.header.error == fuse::kFuseSuccess) {
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open_count++;
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}
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break;
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case FUSE_RELEASE:
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if (open_count != 0) {
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open_count--;
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} else {
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LOG(WARNING) << "Unexpected FUSE_RELEASE before opening a file.";
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break;
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}
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if (open_count == 0) {
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return true;
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}
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break;
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}
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}
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}
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} // namespace fuse
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} // namespace android
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