| /* |
| * Copyright (C) 2018 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. |
| */ |
| |
| #include "QuotaUtils.h" |
| |
| #include <fstream> |
| #include <unordered_map> |
| |
| #include <sys/quota.h> |
| |
| #include <android-base/logging.h> |
| |
| #include "utils.h" |
| |
| namespace android { |
| namespace installd { |
| |
| namespace { |
| |
| std::recursive_mutex mMountsLock; |
| |
| /* Map of all quota mounts from target to source */ |
| std::unordered_map<std::string, std::string> mQuotaReverseMounts; |
| |
| std::string& FindQuotaDeviceForUuid(const std::string& uuid) { |
| std::lock_guard<std::recursive_mutex> lock(mMountsLock); |
| auto path = create_data_path(uuid.empty() ? nullptr : uuid.c_str()); |
| return mQuotaReverseMounts[path]; |
| } |
| |
| } // namespace |
| |
| bool InvalidateQuotaMounts() { |
| std::lock_guard<std::recursive_mutex> lock(mMountsLock); |
| |
| mQuotaReverseMounts.clear(); |
| |
| std::ifstream in("/proc/mounts"); |
| if (!in.is_open()) { |
| return false; |
| } |
| |
| std::string source; |
| std::string target; |
| std::string ignored; |
| while (!in.eof()) { |
| std::getline(in, source, ' '); |
| std::getline(in, target, ' '); |
| std::getline(in, ignored); |
| |
| if (source.compare(0, 11, "/dev/block/") == 0) { |
| struct dqblk dq; |
| if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), source.c_str(), 0, |
| reinterpret_cast<char*>(&dq)) == 0) { |
| LOG(DEBUG) << "Found quota mount " << source << " at " << target; |
| mQuotaReverseMounts[target] = source; |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool IsQuotaSupported(const std::string& uuid) { |
| return !FindQuotaDeviceForUuid(uuid).empty(); |
| } |
| |
| int64_t GetOccupiedSpaceForUid(const std::string& uuid, uid_t uid) { |
| const std::string device = FindQuotaDeviceForUuid(uuid); |
| if (device == "") { |
| return -1; |
| } |
| struct dqblk dq; |
| if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), device.c_str(), uid, |
| reinterpret_cast<char*>(&dq)) != 0) { |
| if (errno != ESRCH) { |
| PLOG(ERROR) << "Failed to quotactl " << device << " for UID " << uid; |
| } |
| return -1; |
| } else { |
| #if MEASURE_DEBUG |
| LOG(DEBUG) << "quotactl() for UID " << uid << " " << dq.dqb_curspace; |
| #endif |
| return dq.dqb_curspace; |
| } |
| } |
| |
| int64_t GetOccupiedSpaceForGid(const std::string& uuid, gid_t gid) { |
| const std::string device = FindQuotaDeviceForUuid(uuid); |
| if (device == "") { |
| return -1; |
| } |
| struct dqblk dq; |
| if (quotactl(QCMD(Q_GETQUOTA, GRPQUOTA), device.c_str(), gid, |
| reinterpret_cast<char*>(&dq)) != 0) { |
| if (errno != ESRCH) { |
| PLOG(ERROR) << "Failed to quotactl " << device << " for GID " << gid; |
| } |
| return -1; |
| } else { |
| #if MEASURE_DEBUG |
| LOG(DEBUG) << "quotactl() for GID " << gid << " " << dq.dqb_curspace; |
| #endif |
| return dq.dqb_curspace; |
| } |
| |
| } |
| |
| } // namespace installd |
| } // namespace android |