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      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 
     48 int Ext4::doMount(const char *fsPath, const char *mountPoint, bool ro, bool remount,
     49         bool executable) {
     50     int rc;
     51     unsigned long flags;
     52 
     53     flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
     54 
     55     flags |= (executable ? 0 : MS_NOEXEC);
     56     flags |= (ro ? MS_RDONLY : 0);
     57     flags |= (remount ? MS_REMOUNT : 0);
     58 
     59     rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
     60 
     61     if (rc && errno == EROFS) {
     62         SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
     63         flags |= MS_RDONLY;
     64         rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
     65     }
     66 
     67     return rc;
     68 }
     69 
     70 int Ext4::format(const char *fsPath, const char *mountpoint) {
     71     int fd;
     72     const char *args[5];
     73     int rc;
     74     int status;
     75 
     76     args[0] = MKEXT4FS_PATH;
     77     args[1] = "-J";
     78     args[2] = "-a";
     79     args[3] = mountpoint;
     80     args[4] = fsPath;
     81     rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status, false,
     82             true);
     83     if (rc != 0) {
     84         SLOGE("Filesystem (ext4) format failed due to logwrap error");
     85         errno = EIO;
     86         return -1;
     87     }
     88 
     89     if (!WIFEXITED(status)) {
     90         SLOGE("Filesystem (ext4) format did not exit properly");
     91         errno = EIO;
     92         return -1;
     93     }
     94 
     95     status = WEXITSTATUS(status);
     96 
     97     if (status == 0) {
     98         SLOGI("Filesystem (ext4) formatted OK");
     99         return 0;
    100     } else {
    101         SLOGE("Format (ext4) failed (unknown exit code %d)", status);
    102         errno = EIO;
    103         return -1;
    104     }
    105     return 0;
    106 }
    107