/*
* 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