blob: 2386bf84b81ec327fc7bf23036f63d7fbf1a7110 [file] [log] [blame]
Daichi Hironoc6134762016-10-27 14:57:55 +09001/*
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
22namespace android {
Daichi Hirono691739b2016-11-15 15:42:05 +090023namespace fuse {
Daichi Hironoc6134762016-10-27 14:57:55 +090024
Daichi Hirono691739b2016-11-15 15:42:05 +090025bool StartFuseBridgeLoop(
26 int raw_dev_fd, int raw_proxy_fd, FuseBridgeLoopCallback* callback) {
Daichi Hironoc6134762016-10-27 14:57:55 +090027 base::unique_fd dev_fd(raw_dev_fd);
28 base::unique_fd proxy_fd(raw_proxy_fd);
Daichi Hirono691739b2016-11-15 15:42:05 +090029 FuseBuffer buffer;
Daichi Hirono30e68082016-11-15 09:31:21 +090030 size_t open_count = 0;
Daichi Hironoc6134762016-10-27 14:57:55 +090031
32 LOG(DEBUG) << "Start fuse loop.";
33 while (true) {
Daichi Hironoa0aecda2016-11-08 10:17:51 +090034 if (!buffer.request.Read(dev_fd)) {
Daichi Hironoc6134762016-10-27 14:57:55 +090035 return false;
36 }
37
Daichi Hironoa0aecda2016-11-08 10:17:51 +090038 const uint32_t opcode = buffer.request.header.opcode;
Daichi Hironoc6134762016-10-27 14:57:55 +090039 LOG(VERBOSE) << "Read a fuse packet, opcode=" << opcode;
40 switch (opcode) {
41 case FUSE_FORGET:
42 // Do not reply to FUSE_FORGET.
43 continue;
44
45 case FUSE_LOOKUP:
46 case FUSE_GETATTR:
47 case FUSE_OPEN:
48 case FUSE_READ:
49 case FUSE_WRITE:
50 case FUSE_RELEASE:
Daichi Hironoa0aecda2016-11-08 10:17:51 +090051 case FUSE_FSYNC:
52 if (!buffer.request.Write(proxy_fd)) {
Daichi Hironoc6134762016-10-27 14:57:55 +090053 LOG(ERROR) << "Failed to write a request to the proxy.";
54 return false;
55 }
Daichi Hironoa0aecda2016-11-08 10:17:51 +090056 if (!buffer.response.Read(proxy_fd)) {
Daichi Hironoc6134762016-10-27 14:57:55 +090057 LOG(ERROR) << "Failed to read a response from the proxy.";
58 return false;
59 }
60 break;
61
62 case FUSE_INIT:
Daichi Hironoa0aecda2016-11-08 10:17:51 +090063 buffer.HandleInit();
Daichi Hironoc6134762016-10-27 14:57:55 +090064 break;
65
66 default:
Daichi Hironoa0aecda2016-11-08 10:17:51 +090067 buffer.HandleNotImpl();
Daichi Hironoc6134762016-10-27 14:57:55 +090068 break;
69 }
70
Daichi Hironoa0aecda2016-11-08 10:17:51 +090071 if (!buffer.response.Write(dev_fd)) {
Daichi Hironoc6134762016-10-27 14:57:55 +090072 LOG(ERROR) << "Failed to write a response to the device.";
73 return false;
74 }
75
Daichi Hirono30e68082016-11-15 09:31:21 +090076 switch (opcode) {
77 case FUSE_INIT:
78 callback->OnMount();
79 break;
80 case FUSE_OPEN:
81 if (buffer.response.header.error == fuse::kFuseSuccess) {
82 open_count++;
83 }
84 break;
85 case FUSE_RELEASE:
86 if (open_count != 0) {
87 open_count--;
88 } else {
89 LOG(WARNING) << "Unexpected FUSE_RELEASE before opening a file.";
90 break;
91 }
92 if (open_count == 0) {
93 return true;
94 }
95 break;
Daichi Hironoc6134762016-10-27 14:57:55 +090096 }
97 }
98}
99
Daichi Hironoa0aecda2016-11-08 10:17:51 +0900100} // namespace fuse
Daichi Hironoc6134762016-10-27 14:57:55 +0900101} // namespace android