Home | History | Annotate | Download | only in fs_mgr 
      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 get_dev_sz(char *fs_blkdev, uint64_t *dev_sz)
     38 {
     39     int fd;
     40 
     41     if ((fd = open(fs_blkdev, O_RDONLY)) < 0) {
     42         PERROR << "Cannot open block device";
     43         return -1;
     44     }
     45 
     46     if ((ioctl(fd, BLKGETSIZE64, dev_sz)) == -1) {
     47         PERROR << "Cannot get block device size";
     48         close(fd);
     49         return -1;
     50     }
     51 
     52     close(fd);
     53     return 0;
     54 }
     55 
     56 static int format_ext4(char *fs_blkdev, char *fs_mnt_point, bool crypt_footer)
     57 {
     58     uint64_t dev_sz;
     59     int rc = 0;
     60     int status;
     61 
     62     rc = get_dev_sz(fs_blkdev, &dev_sz);
     63     if (rc) {
     64         return rc;
     65     }
     66 
     67     /* Format the partition using the calculated length */
     68     if (crypt_footer) {
     69         dev_sz -= CRYPT_FOOTER_OFFSET;
     70     }
     71 
     72     std::string size_str = std::to_string(dev_sz / 4096);
     73     const char* const mke2fs_args[] = {
     74         "/system/bin/mke2fs", "-t", "ext4", "-b", "4096", fs_blkdev, size_str.c_str(), nullptr};
     75 
     76     rc = android_fork_execvp_ext(arraysize(mke2fs_args), const_cast<char**>(mke2fs_args), NULL,
     77                                  true, LOG_KLOG, true, nullptr, nullptr, 0);
     78     if (rc) {
     79         LERROR << "mke2fs returned " << rc;
     80         return rc;
     81     }
     82 
     83     const char* const e2fsdroid_args[] = {
     84         "/system/bin/e2fsdroid",
     85         "-e",
     86         "-a",
     87         fs_mnt_point,
     88         fs_blkdev,
     89         nullptr};
     90 
     91     rc = android_fork_execvp_ext(arraysize(e2fsdroid_args), const_cast<char**>(e2fsdroid_args),
     92                                  NULL, true, LOG_KLOG, true, nullptr, nullptr, 0);
     93     if (rc) {
     94         LERROR << "e2fsdroid returned " << rc;
     95     }
     96 
     97     return rc;
     98 }
     99 
    100 static int format_f2fs(char *fs_blkdev, uint64_t dev_sz, bool crypt_footer)
    101 {
    102     int status;
    103 
    104     if (!dev_sz) {
    105         int rc = get_dev_sz(fs_blkdev, &dev_sz);
    106         if (rc) {
    107             return rc;
    108         }
    109     }
    110 
    111     /* Format the partition using the calculated length */
    112     if (crypt_footer) {
    113         dev_sz -= CRYPT_FOOTER_OFFSET;
    114     }
    115 
    116     std::string size_str = std::to_string(dev_sz / 4096);
    117     // clang-format off
    118     const char* const args[] = {
    119         "/system/bin/make_f2fs",
    120         "-d1",
    121         "-f",
    122         "-O", "encrypt",
    123         "-O", "quota",
    124         "-O", "verity",
    125         "-w", "4096",
    126         fs_blkdev,
    127         size_str.c_str(),
    128         nullptr
    129     };
    130     // clang-format on
    131 
    132     return android_fork_execvp_ext(arraysize(args), const_cast<char**>(args), NULL, true,
    133                                    LOG_KLOG, true, nullptr, nullptr, 0);
    134 }
    135 
    136 int fs_mgr_do_format(struct fstab_rec *fstab, bool crypt_footer)
    137 {
    138     int rc = -EINVAL;
    139 
    140     LERROR << __FUNCTION__ << ": Format " << fstab->blk_device
    141            << " as '" << fstab->fs_type << "'";
    142 
    143     if (!strncmp(fstab->fs_type, "f2fs", 4)) {
    144         rc = format_f2fs(fstab->blk_device, fstab->length, crypt_footer);
    145     } else if (!strncmp(fstab->fs_type, "ext4", 4)) {
    146         rc = format_ext4(fstab->blk_device, fstab->mount_point, crypt_footer);
    147     } else {
    148         LERROR << "File system type '" << fstab->fs_type << "' is not supported";
    149     }
    150 
    151     return rc;
    152 }
    153