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/*
* Copyright (C) 2012 The Android Open Source Project
* Copyright (C) 2019 The LineageOS Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <string>
#include <vector>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <linux/kdev_t.h>
#define LOG_TAG "Vold"
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <cutils/log.h>
#include <cutils/properties.h>
#include <logwrap/logwrap.h>
#include <private/android_filesystem_config.h>
#include <selinux/selinux.h>
#include "Ext4.h"
#include "Utils.h"
using android::base::StringPrintf;
namespace android {
namespace volmgr {
namespace ext4 {
static const char* kFsckPath = "/sbin/e2fsck";
status_t Check(const std::string& source, const std::string& target, bool trusted) {
// The following is shamelessly borrowed from fs_mgr.c, so it should be
// kept in sync with any changes over there.
const char* c_source = source.c_str();
const char* c_target = target.c_str();
int ret;
long tmpmnt_flags = MS_NOATIME | MS_NOEXEC | MS_NOSUID;
char* tmpmnt_opts = (char*)"nomblk_io_submit,errors=remount-ro";
/*
* First try to mount and unmount the filesystem. We do this because
* the kernel is more efficient than e2fsck in running the journal and
* processing orphaned inodes, and on at least one device with a
* performance issue in the emmc firmware, it can take e2fsck 2.5 minutes
* to do what the kernel does in about a second.
*
* After mounting and unmounting the filesystem, run e2fsck, and if an
* error is recorded in the filesystem superblock, e2fsck will do a full
* check. Otherwise, it does nothing. If the kernel cannot mount the
* filesytsem due to an error, e2fsck is still run to do a full check
* fix the filesystem.
*/
ret = mount(c_source, c_target, "ext4", tmpmnt_flags, tmpmnt_opts);
if (!ret) {
int i;
for (i = 0; i < 5; i++) {
// Try to umount 5 times before continuing on.
// Should we try rebooting if all attempts fail?
int result = umount(c_target);
if (result == 0) {
break;
}
ALOGW("%s(): umount(%s)=%d: %s\n", __func__, c_target, result, strerror(errno));
sleep(1);
}
}
/*
* Some system images do not have e2fsck for licensing reasons
* (e.g. recent SDK system images). Detect these and skip the check.
*/
if (access(kFsckPath, X_OK)) {
ALOGD("Not running %s on %s (executable not in system image)\n", kFsckPath, c_source);
} else {
ALOGD("Running %s on %s\n", kFsckPath, c_source);
std::vector<std::string> cmd;
cmd.push_back(kFsckPath);
cmd.push_back("-y");
cmd.push_back(c_source);
return ForkExecvp(cmd, trusted ? sFsckContext : sFsckUntrustedContext);
}
return 0;
}
status_t Mount(const std::string& source, const std::string& target, bool ro, bool remount,
bool executable, const std::string& opts /* = "" */, bool trusted, bool portable) {
int rc;
unsigned long flags;
std::string data(opts);
if (portable) {
if (!data.empty()) {
data += ",";
}
data += "context=u:object_r:sdcard_posix:s0";
}
const char* c_source = source.c_str();
const char* c_target = target.c_str();
const char* c_data = data.c_str();
flags = MS_NOATIME | MS_NODEV | MS_NOSUID;
// Only use MS_DIRSYNC if we're not mounting adopted storage
if (!trusted) {
flags |= MS_DIRSYNC;
}
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
rc = mount(c_source, c_target, "ext4", flags, c_data);
if (portable && rc == 0) {
chown(c_target, AID_MEDIA_RW, AID_MEDIA_RW);
chmod(c_target, 0775);
}
if (rc && errno == EROFS) {
SLOGE("%s appears to be a read only filesystem - retrying mount RO", c_source);
flags |= MS_RDONLY;
rc = mount(c_source, c_target, "ext4", flags, c_data);
}
return rc;
}
} // namespace ext4
} // namespace volmgr
} // namespace android
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