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authorDaichi Hirono2016-10-26 20:37:05 -0500
committerDaichi Hirono2016-10-26 22:40:24 -0500
commit7f8e819ded361e963df7aa648ca2c6d49c7b46b6 (patch)
tree33e131ab74de2a90c895c66066d561fc923fae84 /libappfuse/include/libappfuse
parent459ec807a7c2da0e45cd30e43fa5bf12e5f017dd (diff)
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Add utility functions for FUSE.
The CL adds utility functions to framework to parse FUSE messages from the kernel. The library will be used from framework JNI and service JNI. Bug: 32260320 Test: libappfuse_test Change-Id: Ib89b26d34789e6c26a3288beceb3ea145c1ae780
Diffstat (limited to 'libappfuse/include/libappfuse')
-rw-r--r--libappfuse/include/libappfuse/AppFuse.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/libappfuse/include/libappfuse/AppFuse.h b/libappfuse/include/libappfuse/AppFuse.h
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+++ b/libappfuse/include/libappfuse/AppFuse.h
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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#ifndef ANDROID_LIBAPPFUSE_APPFUSE_H_
18#define ANDROID_LIBAPPFUSE_APPFUSE_H_
19
20#include <linux/fuse.h>
21
22namespace android {
23
24// The numbers came from sdcard.c.
25// Maximum number of bytes to write/read in one request/one reply.
26constexpr size_t kFuseMaxWrite = 256 * 1024;
27constexpr size_t kFuseMaxRead = 128 * 1024;
28constexpr int32_t kFuseSuccess = 0;
29
30template<typename T, typename Header>
31struct FuseMessage {
32 Header header;
33 bool Read(int fd);
34 bool Write(int fd) const;
35 private:
36 bool CheckHeaderLength() const;
37 bool CheckResult(int result, const char* operation_name) const;
38};
39
40struct FuseRequest : public FuseMessage<FuseRequest, fuse_in_header> {
41 union {
42 struct {
43 fuse_write_in write_in;
44 char write_data[kFuseMaxWrite];
45 };
46 fuse_open_in open_in;
47 fuse_init_in init_in;
48 fuse_read_in read_in;
49 char lookup_name[];
50 };
51};
52
53struct FuseResponse : public FuseMessage<FuseResponse, fuse_out_header> {
54 union {
55 fuse_init_out init_out;
56 fuse_entry_out entry_out;
57 fuse_attr_out attr_out;
58 fuse_open_out open_out;
59 char read_data[kFuseMaxRead];
60 fuse_write_out write_out;
61 };
62 void Reset(uint32_t data_length, int32_t error, uint64_t unique);
63 void ResetHeader(uint32_t data_length, int32_t error, uint64_t unique);
64};
65
66union FuseBuffer {
67 FuseRequest request;
68 FuseResponse response;
69
70 void HandleInit();
71 void HandleNotImpl();
72};
73
74} // namespace android
75
76#endif // ANDROID_LIBAPPFUSE_APPFUSE_H_