blob: b238dd36e30335b662f380ee32813fc681148683 [file] [log] [blame]
/*
* 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