1 /*
2 * Copyright (C) 2019 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 // Need to use LOGE_EX.
18 #define LOG_TAG "FuseDaemonJNI"
19
20 #include <nativehelper/scoped_utf_chars.h>
21
22 #include <string>
23
24 #include "FuseDaemon.h"
25 #include "MediaProviderWrapper.h"
26 #include "android-base/logging.h"
27 #include "android-base/unique_fd.h"
28
29 namespace mediaprovider {
30 namespace {
31
32 constexpr const char* CLASS_NAME = "com/android/providers/media/fuse/FuseDaemon";
33 static jclass gFuseDaemonClass;
34
com_android_providers_media_FuseDaemon_new(JNIEnv * env,jobject self,jobject media_provider)35 jlong com_android_providers_media_FuseDaemon_new(JNIEnv* env, jobject self,
36 jobject media_provider) {
37 LOG(DEBUG) << "Creating the FUSE daemon...";
38 return reinterpret_cast<jlong>(new fuse::FuseDaemon(env, media_provider));
39 }
40
com_android_providers_media_FuseDaemon_start(JNIEnv * env,jobject self,jlong java_daemon,jint fd,jstring java_path)41 void com_android_providers_media_FuseDaemon_start(JNIEnv* env, jobject self, jlong java_daemon,
42 jint fd, jstring java_path) {
43 LOG(DEBUG) << "Starting the FUSE daemon...";
44 fuse::FuseDaemon* const daemon = reinterpret_cast<fuse::FuseDaemon*>(java_daemon);
45
46 android::base::unique_fd ufd(fd);
47
48 ScopedUtfChars utf_chars_path(env, java_path);
49 if (!utf_chars_path.c_str()) {
50 return;
51 }
52
53 daemon->Start(std::move(ufd), utf_chars_path.c_str());
54 }
55
com_android_providers_media_FuseDaemon_is_started(JNIEnv * env,jobject self,jlong java_daemon)56 bool com_android_providers_media_FuseDaemon_is_started(JNIEnv* env, jobject self,
57 jlong java_daemon) {
58 LOG(DEBUG) << "Checking if FUSE daemon started...";
59 const fuse::FuseDaemon* daemon = reinterpret_cast<fuse::FuseDaemon*>(java_daemon);
60 return daemon->IsStarted();
61 }
62
com_android_providers_media_FuseDaemon_delete(JNIEnv * env,jobject self,jlong java_daemon)63 void com_android_providers_media_FuseDaemon_delete(JNIEnv* env, jobject self, jlong java_daemon) {
64 LOG(DEBUG) << "Destroying the FUSE daemon...";
65 fuse::FuseDaemon* const daemon = reinterpret_cast<fuse::FuseDaemon*>(java_daemon);
66 delete daemon;
67 }
68
com_android_providers_media_FuseDaemon_should_open_with_fuse(JNIEnv * env,jobject self,jlong java_daemon,jstring java_path,jboolean for_read,jint fd)69 jboolean com_android_providers_media_FuseDaemon_should_open_with_fuse(JNIEnv* env, jobject self,
70 jlong java_daemon,
71 jstring java_path,
72 jboolean for_read, jint fd) {
73 fuse::FuseDaemon* const daemon = reinterpret_cast<fuse::FuseDaemon*>(java_daemon);
74 if (daemon) {
75 ScopedUtfChars utf_chars_path(env, java_path);
76 if (!utf_chars_path.c_str()) {
77 // TODO(b/145741852): Throw exception
78 return JNI_FALSE;
79 }
80
81 return daemon->ShouldOpenWithFuse(fd, for_read, utf_chars_path.c_str());
82 }
83 // TODO(b/145741852): Throw exception
84 return JNI_FALSE;
85 }
86
com_android_providers_media_FuseDaemon_invalidate_fuse_dentry_cache(JNIEnv * env,jobject self,jlong java_daemon,jstring java_path)87 void com_android_providers_media_FuseDaemon_invalidate_fuse_dentry_cache(JNIEnv* env, jobject self,
88 jlong java_daemon,
89 jstring java_path) {
90 fuse::FuseDaemon* const daemon = reinterpret_cast<fuse::FuseDaemon*>(java_daemon);
91 if (daemon) {
92 ScopedUtfChars utf_chars_path(env, java_path);
93 if (!utf_chars_path.c_str()) {
94 // TODO(b/145741152): Throw exception
95 return;
96 }
97
98 CHECK(pthread_getspecific(fuse::MediaProviderWrapper::gJniEnvKey) == nullptr);
99 daemon->InvalidateFuseDentryCache(utf_chars_path.c_str());
100 }
101 // TODO(b/145741152): Throw exception
102 }
103
com_android_providers_media_FuseDaemon_is_fuse_thread(JNIEnv * env,jclass clazz)104 bool com_android_providers_media_FuseDaemon_is_fuse_thread(JNIEnv* env, jclass clazz) {
105 return pthread_getspecific(fuse::MediaProviderWrapper::gJniEnvKey) != nullptr;
106 }
107
108 const JNINativeMethod methods[] = {
109 {"native_new", "(Lcom/android/providers/media/MediaProvider;)J",
110 reinterpret_cast<void*>(com_android_providers_media_FuseDaemon_new)},
111 {"native_start", "(JILjava/lang/String;)V",
112 reinterpret_cast<void*>(com_android_providers_media_FuseDaemon_start)},
113 {"native_delete", "(J)V",
114 reinterpret_cast<void*>(com_android_providers_media_FuseDaemon_delete)},
115 {"native_should_open_with_fuse", "(JLjava/lang/String;ZI)Z",
116 reinterpret_cast<void*>(com_android_providers_media_FuseDaemon_should_open_with_fuse)},
117 {"native_is_fuse_thread", "()Z",
118 reinterpret_cast<void*>(com_android_providers_media_FuseDaemon_is_fuse_thread)},
119 {"native_is_started", "(J)Z",
120 reinterpret_cast<void*>(com_android_providers_media_FuseDaemon_is_started)},
121 {"native_invalidate_fuse_dentry_cache", "(JLjava/lang/String;)V",
122 reinterpret_cast<void*>(
123 com_android_providers_media_FuseDaemon_invalidate_fuse_dentry_cache)}};
124 } // namespace
125
register_android_providers_media_FuseDaemon(JavaVM * vm,JNIEnv * env)126 void register_android_providers_media_FuseDaemon(JavaVM* vm, JNIEnv* env) {
127 gFuseDaemonClass = static_cast<jclass>(env->NewGlobalRef(env->FindClass(CLASS_NAME)));
128
129 if (gFuseDaemonClass == nullptr) {
130 LOG(FATAL) << "Unable to find class : " << CLASS_NAME;
131 }
132
133 if (env->RegisterNatives(gFuseDaemonClass, methods, sizeof(methods) / sizeof(methods[0])) < 0) {
134 LOG(FATAL) << "Unable to register native methods";
135 }
136
137 fuse::MediaProviderWrapper::OneTimeInit(vm);
138 }
139 } // namespace mediaprovider
140