Ext4.cpp revision 344ca10856f3d3087a3288ce8f91ad83665d93fb 
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
33#include <linux/kdev_t.h>
34#include <linux/fs.h>
35
36#define LOG_TAG "Vold"
37
38#include <cutils/log.h>
39#include <cutils/properties.h>
40
41#include "Ext4.h"
42
43#define MKEXT4FS_PATH "/system/bin/make_ext4fs";
44
45extern "C" int logwrap(int argc, const char **argv, int background);
46
47
48int 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
70int Ext4::format(const char *fsPath) {
71    int fd;
72    const char *args[4];
73    int rc;
74
75    args[0] = MKEXT4FS_PATH;
76    args[1] = "-J";
77    args[2] = fsPath;
78    args[3] = NULL;
79    rc = logwrap(3, args, 1);
80
81    if (rc == 0) {
82        SLOGI("Filesystem (ext4) formatted OK");
83        return 0;
84    } else {
85        SLOGE("Format (ext4) failed (unknown exit code %d)", rc);
86        errno = EIO;
87        return -1;
88    }
89    return 0;
90}
91