1 /*
2 * Copyright (C) 2012 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 <stdio.h>
18 #include <stdlib.h>
19 #include <fcntl.h>
20 #include <unistd.h>
21 #include <errno.h>
22 #include <string.h>
23 #include <dirent.h>
24 #include <errno.h>
25 #include <fcntl.h>
26
27 #include <sys/types.h>
28 #include <sys/stat.h>
29 #include <sys/types.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/wait.h>
33
34 #include <linux/kdev_t.h>
35
36 #define LOG_TAG "Vold"
37
38 #include <cutils/log.h>
39 #include <cutils/properties.h>
40
41 #include <logwrap/logwrap.h>
42
43 #include "Ext4.h"
44 #include "VoldUtil.h"
45
46 #define MKEXT4FS_PATH "/system/bin/make_ext4fs"
47 #define RESIZE2FS_PATH "/system/bin/resize2fs"
48
doMount(const char * fsPath,const char * mountPoint,bool ro,bool remount,bool executable)49 int Ext4::doMount(const char *fsPath, const char *mountPoint, bool ro, bool remount,
50 bool executable) {
51 int rc;
52 unsigned long flags;
53
54 flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
55
56 flags |= (executable ? 0 : MS_NOEXEC);
57 flags |= (ro ? MS_RDONLY : 0);
58 flags |= (remount ? MS_REMOUNT : 0);
59
60 rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
61
62 if (rc && errno == EROFS) {
63 SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
64 flags |= MS_RDONLY;
65 rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
66 }
67
68 return rc;
69 }
70
resize(const char * fspath,unsigned int numSectors)71 int Ext4::resize(const char *fspath, unsigned int numSectors) {
72 const char *args[4];
73 char* size_str;
74 int rc;
75 int status;
76
77 args[0] = RESIZE2FS_PATH;
78 args[1] = "-f";
79 args[2] = fspath;
80 if (asprintf(&size_str, "%ds", numSectors) < 0)
81 {
82 SLOGE("Filesystem (ext4) resize failed to set size");
83 return -1;
84 }
85 args[3] = size_str;
86 rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status, false,
87 true);
88 free(size_str);
89 if (rc != 0) {
90 SLOGE("Filesystem (ext4) resize failed due to logwrap error");
91 errno = EIO;
92 return -1;
93 }
94
95 if (!WIFEXITED(status)) {
96 SLOGE("Filesystem (ext4) resize did not exit properly");
97 errno = EIO;
98 return -1;
99 }
100
101 status = WEXITSTATUS(status);
102
103 if (status == 0) {
104 SLOGI("Filesystem (ext4) resized OK");
105 return 0;
106 } else {
107 SLOGE("Resize (ext4) failed (unknown exit code %d)", status);
108 errno = EIO;
109 return -1;
110 }
111 return 0;
112 }
113
format(const char * fsPath,unsigned int numSectors,const char * mountpoint)114 int Ext4::format(const char *fsPath, unsigned int numSectors, const char *mountpoint) {
115 int fd;
116 const char *args[7];
117 int rc;
118 int status;
119
120 args[0] = MKEXT4FS_PATH;
121 args[1] = "-J";
122 args[2] = "-a";
123 args[3] = mountpoint;
124 if (numSectors) {
125 char tmp[32];
126 snprintf(tmp, sizeof(tmp), "%u", numSectors * 512);
127 const char *size = tmp;
128 args[4] = "-l";
129 args[5] = size;
130 args[6] = fsPath;
131 rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status, false, true);
132 } else {
133 args[4] = fsPath;
134 rc = android_fork_execvp(5, (char **)args, &status, false, true);
135 }
136 rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status, false,
137 true);
138 if (rc != 0) {
139 SLOGE("Filesystem (ext4) format failed due to logwrap error");
140 errno = EIO;
141 return -1;
142 }
143
144 if (!WIFEXITED(status)) {
145 SLOGE("Filesystem (ext4) format did not exit properly");
146 errno = EIO;
147 return -1;
148 }
149
150 status = WEXITSTATUS(status);
151
152 if (status == 0) {
153 SLOGI("Filesystem (ext4) formatted OK");
154 return 0;
155 } else {
156 SLOGE("Format (ext4) failed (unknown exit code %d)", status);
157 errno = EIO;
158 return -1;
159 }
160 return 0;
161 }
162