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