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 <stdio.h>
18 #include <unistd.h>
19 #include <sys/types.h>
20 #include <sys/stat.h>
21 #include <fcntl.h>
22 #include <sys/wait.h>
23 #include <errno.h>
24 #include <cutils/partition_utils.h>
25 #include <sys/mount.h>
26
27 #include <ext4_utils/ext4.h>
28 #include <ext4_utils/ext4_utils.h>
29 #include <logwrap/logwrap.h>
30 #include <selinux/android.h>
31 #include <selinux/label.h>
32 #include <selinux/selinux.h>
33
34 #include "fs_mgr_priv.h"
35 #include "cryptfs.h"
36
format_ext4(char * fs_blkdev,char * fs_mnt_point,bool crypt_footer)37 static int format_ext4(char *fs_blkdev, char *fs_mnt_point, bool crypt_footer)
38 {
39 uint64_t dev_sz;
40 int fd, rc = 0;
41
42 if ((fd = open(fs_blkdev, O_WRONLY)) < 0) {
43 PERROR << "Cannot open block device";
44 return -1;
45 }
46
47 if ((ioctl(fd, BLKGETSIZE64, &dev_sz)) == -1) {
48 PERROR << "Cannot get block device size";
49 close(fd);
50 return -1;
51 }
52
53 close(fd);
54
55 /* Format the partition using the calculated length */
56 if (crypt_footer) {
57 dev_sz -= CRYPT_FOOTER_OFFSET;
58 }
59
60 std::string size_str = std::to_string(dev_sz / 4096);
61 const char* const mke2fs_args[] = {
62 "/system/bin/mke2fs", "-t", "ext4", "-b", "4096", fs_blkdev, size_str.c_str(), nullptr};
63
64 rc = android_fork_execvp_ext(arraysize(mke2fs_args), const_cast<char**>(mke2fs_args), NULL,
65 true, LOG_KLOG, true, nullptr, nullptr, 0);
66 if (rc) {
67 LERROR << "mke2fs returned " << rc;
68 return rc;
69 }
70
71 const char* const e2fsdroid_args[] = {
72 "/system/bin/e2fsdroid",
73 "-e",
74 "-a",
75 fs_mnt_point,
76 fs_blkdev,
77 nullptr};
78
79 rc = android_fork_execvp_ext(arraysize(e2fsdroid_args), const_cast<char**>(e2fsdroid_args),
80 NULL, true, LOG_KLOG, true, nullptr, nullptr, 0);
81 if (rc) {
82 LERROR << "e2fsdroid returned " << rc;
83 }
84
85 return rc;
86 }
87
format_f2fs(char * fs_blkdev)88 static int format_f2fs(char *fs_blkdev)
89 {
90 const char* const args[] = {"/system/bin/make_f2fs", "-f", "-O encrypt", fs_blkdev, nullptr};
91
92 return android_fork_execvp_ext(arraysize(args), const_cast<char**>(args), NULL, true,
93 LOG_KLOG, true, nullptr, nullptr, 0);
94 }
95
fs_mgr_do_format(struct fstab_rec * fstab,bool crypt_footer)96 int fs_mgr_do_format(struct fstab_rec *fstab, bool crypt_footer)
97 {
98 int rc = -EINVAL;
99
100 LERROR << __FUNCTION__ << ": Format " << fstab->blk_device
101 << " as '" << fstab->fs_type << "'";
102
103 if (!strncmp(fstab->fs_type, "f2fs", 4)) {
104 rc = format_f2fs(fstab->blk_device);
105 } else if (!strncmp(fstab->fs_type, "ext4", 4)) {
106 rc = format_ext4(fstab->blk_device, fstab->mount_point, crypt_footer);
107 } else {
108 LERROR << "File system type '" << fstab->fs_type << "' is not supported";
109 }
110
111 return rc;
112 }
113