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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 #define RESIZE2FS_PATH "/system/bin/resize2fs"
     48 
     49 int Ext4::doMount(const char *fsPath, const char *mountPoint, bool ro, bool remount,
     50         bool executable) {
     51     int rc;
     52     unsigned long flags;
     53 
     54     flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
     55 
     56     flags |= (executable ? 0 : MS_NOEXEC);
     57     flags |= (ro ? MS_RDONLY : 0);
     58     flags |= (remount ? MS_REMOUNT : 0);
     59 
     60     rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
     61 
     62     if (rc && errno == EROFS) {
     63         SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
     64         flags |= MS_RDONLY;
     65         rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
     66     }
     67 
     68     return rc;
     69 }
     70 
     71 int Ext4::resize(const char *fspath, unsigned int numSectors) {
     72     const char *args[4];
     73     char* size_str;
     74     int rc;
     75     int status;
     76 
     77     args[0] = RESIZE2FS_PATH;
     78     args[1] = "-f";
     79     args[2] = fspath;
     80     if (asprintf(&size_str, "%ds", numSectors) < 0)
     81     {
     82       SLOGE("Filesystem (ext4) resize failed to set size");
     83       return -1;
     84     }
     85     args[3] = size_str;
     86     rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status, false,
     87             true);
     88     free(size_str);
     89     if (rc != 0) {
     90         SLOGE("Filesystem (ext4) resize failed due to logwrap error");
     91         errno = EIO;
     92         return -1;
     93     }
     94 
     95     if (!WIFEXITED(status)) {
     96         SLOGE("Filesystem (ext4) resize did not exit properly");
     97         errno = EIO;
     98         return -1;
     99     }
    100 
    101     status = WEXITSTATUS(status);
    102 
    103     if (status == 0) {
    104         SLOGI("Filesystem (ext4) resized OK");
    105         return 0;
    106     } else {
    107         SLOGE("Resize (ext4) failed (unknown exit code %d)", status);
    108         errno = EIO;
    109         return -1;
    110     }
    111     return 0;
    112 }
    113 
    114 int Ext4::format(const char *fsPath, unsigned int numSectors, const char *mountpoint) {
    115     int fd;
    116     const char *args[7];
    117     int rc;
    118     int status;
    119 
    120     args[0] = MKEXT4FS_PATH;
    121     args[1] = "-J";
    122     args[2] = "-a";
    123     args[3] = mountpoint;
    124     if (numSectors) {
    125         char tmp[32];
    126         snprintf(tmp, sizeof(tmp), "%u", numSectors * 512);
    127         const char *size = tmp;
    128         args[4] = "-l";
    129         args[5] = size;
    130         args[6] = fsPath;
    131         rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status, false, true);
    132     } else {
    133         args[4] = fsPath;
    134         rc = android_fork_execvp(5, (char **)args, &status, false, true);
    135     }
    136     rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status, false,
    137             true);
    138     if (rc != 0) {
    139         SLOGE("Filesystem (ext4) format failed due to logwrap error");
    140         errno = EIO;
    141         return -1;
    142     }
    143 
    144     if (!WIFEXITED(status)) {
    145         SLOGE("Filesystem (ext4) format did not exit properly");
    146         errno = EIO;
    147         return -1;
    148     }
    149 
    150     status = WEXITSTATUS(status);
    151 
    152     if (status == 0) {
    153         SLOGI("Filesystem (ext4) formatted OK");
    154         return 0;
    155     } else {
    156         SLOGE("Format (ext4) failed (unknown exit code %d)", status);
    157         errno = EIO;
    158         return -1;
    159     }
    160     return 0;
    161 }
    162