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      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 
     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 
     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 
     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