1 /*
2  * Copyright (C) 2015 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 "F2fs.h"
18 #include "Utils.h"
19 
20 #include <android-base/logging.h>
21 #include <android-base/properties.h>
22 #include <android-base/stringprintf.h>
23 #include <ext4_utils/ext4_crypt.h>
24 
25 #include <vector>
26 #include <string>
27 
28 #include <sys/mount.h>
29 
30 using android::base::StringPrintf;
31 
32 namespace android {
33 namespace vold {
34 namespace f2fs {
35 
36 static const char* kMkfsPath = "/system/bin/make_f2fs";
37 static const char* kFsckPath = "/system/bin/fsck.f2fs";
38 
39 bool IsSupported() {
40     return access(kMkfsPath, X_OK) == 0
41             && access(kFsckPath, X_OK) == 0
42             && IsFilesystemSupported("f2fs");
43 }
44 
45 status_t Check(const std::string& source) {
46     std::vector<std::string> cmd;
47     cmd.push_back(kFsckPath);
48     cmd.push_back("-a");
49     cmd.push_back(source);
50 
51     // f2fs devices are currently always trusted
52     return ForkExecvp(cmd, sFsckContext);
53 }
54 
55 status_t Mount(const std::string& source, const std::string& target) {
56     const char* c_source = source.c_str();
57     const char* c_target = target.c_str();
58     unsigned long flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
59 
60     int res = mount(c_source, c_target, "f2fs", flags, NULL);
61     if (res != 0) {
62         PLOG(ERROR) << "Failed to mount " << source;
63         if (errno == EROFS) {
64             res = mount(c_source, c_target, "f2fs", flags | MS_RDONLY, NULL);
65             if (res != 0) {
66                 PLOG(ERROR) << "Failed to mount read-only " << source;
67             }
68         }
69     }
70 
71     return res;
72 }
73 
74 status_t Format(const std::string& source) {
75     std::vector<std::string> cmd;
76     cmd.push_back(kMkfsPath);
77 
78     cmd.push_back("-f");
79     cmd.push_back("-d1");
80 
81     if (android::base::GetBoolProperty("vold.has_quota", false)) {
82         cmd.push_back("-O");
83         cmd.push_back("quota");
84     }
85     if (e4crypt_is_native()) {
86         cmd.push_back("-O");
87         cmd.push_back("encrypt");
88     }
89 
90     cmd.push_back("-O");
91     cmd.push_back("verity");
92 
93     cmd.push_back(source);
94     return ForkExecvp(cmd);
95 }
96 
97 }  // namespace f2fs
98 }  // namespace vold
99 }  // namespace android
100