Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specic language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "libappfuse/FuseBridgeLoop.h" |
| 18 | |
| 19 | #include <android-base/logging.h> |
| 20 | #include <android-base/unique_fd.h> |
| 21 | |
| 22 | namespace android { |
| 23 | |
| 24 | bool FuseBridgeLoop::Start( |
| 25 | int raw_dev_fd, int raw_proxy_fd, FuseBridgeLoop::Callback* callback) { |
| 26 | base::unique_fd dev_fd(raw_dev_fd); |
| 27 | base::unique_fd proxy_fd(raw_proxy_fd); |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 28 | fuse::FuseBuffer buffer; |
Daichi Hirono | 30e6808 | 2016-11-15 09:31:21 +0900 | [diff] [blame^] | 29 | size_t open_count = 0; |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 30 | |
| 31 | LOG(DEBUG) << "Start fuse loop."; |
| 32 | while (true) { |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 33 | if (!buffer.request.Read(dev_fd)) { |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 34 | return false; |
| 35 | } |
| 36 | |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 37 | const uint32_t opcode = buffer.request.header.opcode; |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 38 | LOG(VERBOSE) << "Read a fuse packet, opcode=" << opcode; |
| 39 | switch (opcode) { |
| 40 | case FUSE_FORGET: |
| 41 | // Do not reply to FUSE_FORGET. |
| 42 | continue; |
| 43 | |
| 44 | case FUSE_LOOKUP: |
| 45 | case FUSE_GETATTR: |
| 46 | case FUSE_OPEN: |
| 47 | case FUSE_READ: |
| 48 | case FUSE_WRITE: |
| 49 | case FUSE_RELEASE: |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 50 | case FUSE_FSYNC: |
| 51 | if (!buffer.request.Write(proxy_fd)) { |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 52 | LOG(ERROR) << "Failed to write a request to the proxy."; |
| 53 | return false; |
| 54 | } |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 55 | if (!buffer.response.Read(proxy_fd)) { |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 56 | LOG(ERROR) << "Failed to read a response from the proxy."; |
| 57 | return false; |
| 58 | } |
| 59 | break; |
| 60 | |
| 61 | case FUSE_INIT: |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 62 | buffer.HandleInit(); |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 63 | break; |
| 64 | |
| 65 | default: |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 66 | buffer.HandleNotImpl(); |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 67 | break; |
| 68 | } |
| 69 | |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 70 | if (!buffer.response.Write(dev_fd)) { |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 71 | LOG(ERROR) << "Failed to write a response to the device."; |
| 72 | return false; |
| 73 | } |
| 74 | |
Daichi Hirono | 30e6808 | 2016-11-15 09:31:21 +0900 | [diff] [blame^] | 75 | switch (opcode) { |
| 76 | case FUSE_INIT: |
| 77 | callback->OnMount(); |
| 78 | break; |
| 79 | case FUSE_OPEN: |
| 80 | if (buffer.response.header.error == fuse::kFuseSuccess) { |
| 81 | open_count++; |
| 82 | } |
| 83 | break; |
| 84 | case FUSE_RELEASE: |
| 85 | if (open_count != 0) { |
| 86 | open_count--; |
| 87 | } else { |
| 88 | LOG(WARNING) << "Unexpected FUSE_RELEASE before opening a file."; |
| 89 | break; |
| 90 | } |
| 91 | if (open_count == 0) { |
| 92 | return true; |
| 93 | } |
| 94 | break; |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 95 | } |
| 96 | } |
| 97 | } |
| 98 | |
Daichi Hirono | a0aecda | 2016-11-08 10:17:51 +0900 | [diff] [blame] | 99 | namespace fuse { |
| 100 | |
| 101 | bool StartFuseBridgeLoop( |
| 102 | int raw_dev_fd, int raw_proxy_fd, FuseBridgeLoopCallback* callback) { |
| 103 | return FuseBridgeLoop().Start(raw_dev_fd, raw_proxy_fd, callback); |
| 104 | } |
| 105 | |
| 106 | } // namespace fuse |
Daichi Hirono | c613476 | 2016-10-27 14:57:55 +0900 | [diff] [blame] | 107 | } // namespace android |