1 /* 2 * Copyright (C) 2020 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 specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef FRAMEWORKS_BASE_CORE_JNI_MISC_UTILS_H_ 18 #define FRAMEWORKS_BASE_CORE_JNI_MISC_UTILS_H_ 19 20 #include <android-base/file.h> 21 #include <android-base/logging.h> 22 #include <android-base/properties.h> 23 #include <fcntl.h> 24 #include <linux/fs.h> 25 26 namespace { 27 static constexpr const char* kExternalStorageSdcardfs = "external_storage.sdcardfs.enabled"; 28 IsFilesystemSupported(const std::string & fsType)29static bool IsFilesystemSupported(const std::string& fsType) { 30 std::string supported; 31 if (!android::base::ReadFileToString("/proc/filesystems", &supported)) { 32 ALOGE("Failed to read supported filesystems"); 33 return false; 34 } 35 return supported.find(fsType + "\n") != std::string::npos; 36 } 37 IsSdcardfsUsed()38static inline bool IsSdcardfsUsed() { 39 return IsFilesystemSupported("sdcardfs") && 40 android::base::GetBoolProperty(kExternalStorageSdcardfs, true); 41 } 42 } // namespace 43 #endif // FRAMEWORKS_BASE_CORE_JNI_MISC_UTILS_H_ 44