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      1 /*
      2  * Copyright (C) 2018 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 #include "QuotaUtils.h"
     18 
     19 #include <fstream>
     20 #include <unordered_map>
     21 
     22 #include <sys/quota.h>
     23 
     24 #include <android-base/logging.h>
     25 
     26 #include "utils.h"
     27 
     28 namespace android {
     29 namespace installd {
     30 
     31 namespace {
     32 
     33 std::recursive_mutex mMountsLock;
     34 
     35 /* Map of all quota mounts from target to source */
     36 std::unordered_map<std::string, std::string> mQuotaReverseMounts;
     37 
     38 std::string& FindQuotaDeviceForUuid(const std::string& uuid) {
     39     std::lock_guard<std::recursive_mutex> lock(mMountsLock);
     40     auto path = create_data_path(uuid.empty() ? nullptr : uuid.c_str());
     41     return mQuotaReverseMounts[path];
     42 }
     43 
     44 } // namespace
     45 
     46 bool InvalidateQuotaMounts() {
     47     std::lock_guard<std::recursive_mutex> lock(mMountsLock);
     48 
     49     mQuotaReverseMounts.clear();
     50 
     51     std::ifstream in("/proc/mounts");
     52     if (!in.is_open()) {
     53         return false;
     54     }
     55 
     56     std::string source;
     57     std::string target;
     58     std::string ignored;
     59     while (!in.eof()) {
     60         std::getline(in, source, ' ');
     61         std::getline(in, target, ' ');
     62         std::getline(in, ignored);
     63 
     64         if (source.compare(0, 11, "/dev/block/") == 0) {
     65             struct dqblk dq;
     66             if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), source.c_str(), 0,
     67                     reinterpret_cast<char*>(&dq)) == 0) {
     68                 LOG(DEBUG) << "Found quota mount " << source << " at " << target;
     69                 mQuotaReverseMounts[target] = source;
     70             }
     71         }
     72     }
     73     return true;
     74 }
     75 
     76 bool IsQuotaSupported(const std::string& uuid) {
     77     return !FindQuotaDeviceForUuid(uuid).empty();
     78 }
     79 
     80 int64_t GetOccupiedSpaceForUid(const std::string& uuid, uid_t uid) {
     81     const std::string device = FindQuotaDeviceForUuid(uuid);
     82     if (device == "") {
     83         return -1;
     84     }
     85     struct dqblk dq;
     86     if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), device.c_str(), uid,
     87             reinterpret_cast<char*>(&dq)) != 0) {
     88         if (errno != ESRCH) {
     89             PLOG(ERROR) << "Failed to quotactl " << device << " for UID " << uid;
     90         }
     91         return -1;
     92     } else {
     93 #if MEASURE_DEBUG
     94         LOG(DEBUG) << "quotactl() for UID " << uid << " " << dq.dqb_curspace;
     95 #endif
     96         return dq.dqb_curspace;
     97     }
     98 }
     99 
    100 int64_t GetOccupiedSpaceForGid(const std::string& uuid, gid_t gid) {
    101     const std::string device = FindQuotaDeviceForUuid(uuid);
    102     if (device == "") {
    103         return -1;
    104     }
    105     struct dqblk dq;
    106     if (quotactl(QCMD(Q_GETQUOTA, GRPQUOTA), device.c_str(), gid,
    107             reinterpret_cast<char*>(&dq)) != 0) {
    108         if (errno != ESRCH) {
    109             PLOG(ERROR) << "Failed to quotactl " << device << " for GID " << gid;
    110         }
    111         return -1;
    112     } else {
    113 #if MEASURE_DEBUG
    114         LOG(DEBUG) << "quotactl() for GID " << gid << " " << dq.dqb_curspace;
    115 #endif
    116         return dq.dqb_curspace;
    117     }
    118 
    119 }
    120 
    121 }  // namespace installd
    122 }  // namespace android
    123