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
FindQuotaDeviceForUuid(const std::string & uuid)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
InvalidateQuotaMounts()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 (target.compare(0, 13, "/data_mirror/") == 0) {
65 continue;
66 }
67
68 if (source.compare(0, 11, "/dev/block/") == 0) {
69 struct dqblk dq;
70 if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), source.c_str(), 0,
71 reinterpret_cast<char*>(&dq)) == 0) {
72 LOG(DEBUG) << "Found quota mount " << source << " at " << target;
73 mQuotaReverseMounts[target] = source;
74 }
75 }
76 }
77 return true;
78 }
79
IsQuotaSupported(const std::string & uuid)80 bool IsQuotaSupported(const std::string& uuid) {
81 return !FindQuotaDeviceForUuid(uuid).empty();
82 }
83
GetOccupiedSpaceForUid(const std::string & uuid,uid_t uid)84 int64_t GetOccupiedSpaceForUid(const std::string& uuid, uid_t uid) {
85 const std::string device = FindQuotaDeviceForUuid(uuid);
86 if (device == "") {
87 return -1;
88 }
89 struct dqblk dq;
90 if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), device.c_str(), uid,
91 reinterpret_cast<char*>(&dq)) != 0) {
92 if (errno != ESRCH) {
93 PLOG(ERROR) << "Failed to quotactl " << device << " for UID " << uid;
94 }
95 return -1;
96 } else {
97 #if MEASURE_DEBUG
98 LOG(DEBUG) << "quotactl() for UID " << uid << " " << dq.dqb_curspace;
99 #endif
100 return dq.dqb_curspace;
101 }
102 }
103
GetOccupiedSpaceForProjectId(const std::string & uuid,int projectId)104 int64_t GetOccupiedSpaceForProjectId(const std::string& uuid, int projectId) {
105 const std::string device = FindQuotaDeviceForUuid(uuid);
106 if (device == "") {
107 return -1;
108 }
109 struct dqblk dq;
110 if (quotactl(QCMD(Q_GETQUOTA, PRJQUOTA), device.c_str(), projectId,
111 reinterpret_cast<char*>(&dq)) != 0) {
112 if (errno != ESRCH) {
113 PLOG(ERROR) << "Failed to quotactl " << device << " for Project ID " << projectId;
114 }
115 return -1;
116 } else {
117 #if MEASURE_DEBUG
118 LOG(DEBUG) << "quotactl() for Project ID " << projectId << " " << dq.dqb_curspace;
119 #endif
120 return dq.dqb_curspace;
121 }
122 }
123
GetOccupiedSpaceForGid(const std::string & uuid,gid_t gid)124 int64_t GetOccupiedSpaceForGid(const std::string& uuid, gid_t gid) {
125 const std::string device = FindQuotaDeviceForUuid(uuid);
126 if (device == "") {
127 return -1;
128 }
129 struct dqblk dq;
130 if (quotactl(QCMD(Q_GETQUOTA, GRPQUOTA), device.c_str(), gid,
131 reinterpret_cast<char*>(&dq)) != 0) {
132 if (errno != ESRCH) {
133 PLOG(ERROR) << "Failed to quotactl " << device << " for GID " << gid;
134 }
135 return -1;
136 } else {
137 #if MEASURE_DEBUG
138 LOG(DEBUG) << "quotactl() for GID " << gid << " " << dq.dqb_curspace;
139 #endif
140 return dq.dqb_curspace;
141 }
142
143 }
144
145 } // namespace installd
146 } // namespace android
147