| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "FuseAppLoopJNI" |
| #define LOG_NDEBUG 0 |
| |
| #include <stdlib.h> |
| #include <sys/stat.h> |
| |
| #include <map> |
| #include <memory> |
| |
| #include <android_runtime/Log.h> |
| #include <android-base/logging.h> |
| #include <android-base/unique_fd.h> |
| #include <jni.h> |
| #include <libappfuse/FuseAppLoop.h> |
| #include <nativehelper/ScopedLocalRef.h> |
| #include <nativehelper/ScopedPrimitiveArray.h> |
| |
| #include "core_jni_helpers.h" |
| |
| namespace android { |
| namespace { |
| constexpr const char* CLASS_NAME = "com/android/internal/os/FuseAppLoop"; |
| |
| jclass gFuseAppLoopClass; |
| jmethodID gOnCommandMethod; |
| jmethodID gOnOpenMethod; |
| |
| class Callback : public fuse::FuseAppLoopCallback { |
| private: |
| typedef ScopedLocalRef<jbyteArray> LocalBytes; |
| JNIEnv* const mEnv; |
| jobject const mSelf; |
| std::map<uint64_t, std::unique_ptr<LocalBytes>> mBuffers; |
| |
| public: |
| Callback(JNIEnv* env, jobject self) : |
| mEnv(env), mSelf(self) {} |
| |
| void OnLookup(uint64_t unique, uint64_t inode) override { |
| CallOnCommand(FUSE_LOOKUP, unique, inode, 0, 0, nullptr); |
| } |
| |
| void OnGetAttr(uint64_t unique, uint64_t inode) override { |
| CallOnCommand(FUSE_GETATTR, unique, inode, 0, 0, nullptr); |
| } |
| |
| void OnOpen(uint64_t unique, uint64_t inode) override { |
| const jbyteArray buffer = static_cast<jbyteArray>(mEnv->CallObjectMethod( |
| mSelf, gOnOpenMethod, unique, inode)); |
| CHECK(!mEnv->ExceptionCheck()); |
| if (buffer == nullptr) { |
| return; |
| } |
| |
| mBuffers.insert(std::make_pair(inode, std::unique_ptr<LocalBytes>( |
| new LocalBytes(mEnv, buffer)))); |
| } |
| |
| void OnFsync(uint64_t unique, uint64_t inode) override { |
| CallOnCommand(FUSE_FSYNC, unique, inode, 0, 0, nullptr); |
| } |
| |
| void OnRelease(uint64_t unique, uint64_t inode) override { |
| mBuffers.erase(inode); |
| CallOnCommand(FUSE_RELEASE, unique, inode, 0, 0, nullptr); |
| } |
| |
| void OnRead(uint64_t unique, uint64_t inode, uint64_t offset, uint32_t size) override { |
| CHECK_LE(size, static_cast<uint32_t>(fuse::kFuseMaxRead)); |
| |
| auto it = mBuffers.find(inode); |
| CHECK(it != mBuffers.end()); |
| |
| CallOnCommand(FUSE_READ, unique, inode, offset, size, it->second->get()); |
| } |
| |
| void OnWrite(uint64_t unique, uint64_t inode, uint64_t offset, uint32_t size, |
| const void* buffer) override { |
| CHECK_LE(size, static_cast<uint32_t>(fuse::kFuseMaxWrite)); |
| |
| auto it = mBuffers.find(inode); |
| CHECK(it != mBuffers.end()); |
| |
| jbyteArray const javaBuffer = it->second->get(); |
| |
| mEnv->SetByteArrayRegion(javaBuffer, 0, size, static_cast<const jbyte*>(buffer)); |
| CHECK(!mEnv->ExceptionCheck()); |
| |
| CallOnCommand(FUSE_WRITE, unique, inode, offset, size, javaBuffer); |
| } |
| |
| private: |
| // Helper function to make sure we invoke CallVoidMethod with correct size of integer arguments. |
| void CallOnCommand(jint command, jlong unique, jlong inode, jlong offset, jint size, |
| jobject bytes) { |
| mEnv->CallVoidMethod(mSelf, gOnCommandMethod, command, unique, inode, offset, size, bytes); |
| CHECK(!mEnv->ExceptionCheck()); |
| } |
| }; |
| |
| jlong com_android_internal_os_FuseAppLoop_new(JNIEnv* env, jobject self, jint jfd) { |
| return reinterpret_cast<jlong>(new fuse::FuseAppLoop(base::unique_fd(jfd))); |
| } |
| |
| void com_android_internal_os_FuseAppLoop_delete(JNIEnv* env, jobject self, jlong ptr) { |
| delete reinterpret_cast<fuse::FuseAppLoop*>(ptr); |
| } |
| |
| void com_android_internal_os_FuseAppLoop_start(JNIEnv* env, jobject self, jlong ptr) { |
| Callback callback(env, self); |
| reinterpret_cast<fuse::FuseAppLoop*>(ptr)->Start(&callback); |
| } |
| |
| void com_android_internal_os_FuseAppLoop_replySimple( |
| JNIEnv* env, jobject self, jlong ptr, jlong unique, jint result) { |
| if (!reinterpret_cast<fuse::FuseAppLoop*>(ptr)->ReplySimple(unique, result)) { |
| reinterpret_cast<fuse::FuseAppLoop*>(ptr)->Break(); |
| } |
| } |
| |
| void com_android_internal_os_FuseAppLoop_replyOpen( |
| JNIEnv* env, jobject self, jlong ptr, jlong unique, jlong fh) { |
| if (!reinterpret_cast<fuse::FuseAppLoop*>(ptr)->ReplyOpen(unique, fh)) { |
| reinterpret_cast<fuse::FuseAppLoop*>(ptr)->Break(); |
| } |
| } |
| |
| void com_android_internal_os_FuseAppLoop_replyLookup( |
| JNIEnv* env, jobject self, jlong ptr, jlong unique, jlong inode, jlong size) { |
| if (!reinterpret_cast<fuse::FuseAppLoop*>(ptr)->ReplyLookup(unique, inode, size)) { |
| reinterpret_cast<fuse::FuseAppLoop*>(ptr)->Break(); |
| } |
| } |
| |
| void com_android_internal_os_FuseAppLoop_replyGetAttr( |
| JNIEnv* env, jobject self, jlong ptr, jlong unique, jlong inode, jlong size) { |
| if (!reinterpret_cast<fuse::FuseAppLoop*>(ptr)->ReplyGetAttr( |
| unique, inode, size, S_IFREG | 0777)) { |
| reinterpret_cast<fuse::FuseAppLoop*>(ptr)->Break(); |
| } |
| } |
| |
| void com_android_internal_os_FuseAppLoop_replyWrite( |
| JNIEnv* env, jobject self, jlong ptr, jlong unique, jint size) { |
| if (!reinterpret_cast<fuse::FuseAppLoop*>(ptr)->ReplyWrite(unique, size)) { |
| reinterpret_cast<fuse::FuseAppLoop*>(ptr)->Break(); |
| } |
| } |
| |
| void com_android_internal_os_FuseAppLoop_replyRead( |
| JNIEnv* env, jobject self, jlong ptr, jlong unique, jint size, jbyteArray data) { |
| ScopedByteArrayRO array(env, data); |
| CHECK_GE(size, 0); |
| CHECK_LE(static_cast<size_t>(size), array.size()); |
| if (!reinterpret_cast<fuse::FuseAppLoop*>(ptr)->ReplyRead(unique, size, array.get())) { |
| reinterpret_cast<fuse::FuseAppLoop*>(ptr)->Break(); |
| } |
| } |
| |
| const JNINativeMethod methods[] = { |
| { |
| "native_new", |
| "(I)J", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_new) |
| }, |
| { |
| "native_delete", |
| "(J)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_delete) |
| }, |
| { |
| "native_start", |
| "(J)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_start) |
| }, |
| { |
| "native_replySimple", |
| "(JJI)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_replySimple) |
| }, |
| { |
| "native_replyOpen", |
| "(JJJ)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_replyOpen) |
| }, |
| { |
| "native_replyLookup", |
| "(JJJJ)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_replyLookup) |
| }, |
| { |
| "native_replyGetAttr", |
| "(JJJJ)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_replyGetAttr) |
| }, |
| { |
| "native_replyRead", |
| "(JJI[B)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_replyRead) |
| }, |
| { |
| "native_replyWrite", |
| "(JJI)V", |
| reinterpret_cast<void*>(com_android_internal_os_FuseAppLoop_replyWrite) |
| }, |
| }; |
| } // namespace |
| |
| int register_com_android_internal_os_FuseAppLoop(JNIEnv* env) { |
| gFuseAppLoopClass = MakeGlobalRefOrDie(env, FindClassOrDie(env, CLASS_NAME)); |
| gOnCommandMethod = GetMethodIDOrDie(env, gFuseAppLoopClass, "onCommand", "(IJJJI[B)V"); |
| gOnOpenMethod = GetMethodIDOrDie(env, gFuseAppLoopClass, "onOpen", "(JJ)[B"); |
| RegisterMethodsOrDie(env, CLASS_NAME, methods, NELEM(methods)); |
| return 0; |
| } |
| } // namespace android |