blob: 00fb4b3cf451fd62bc8af96945e38b2be6bcf73f [file] [log] [blame]
/*
* Copyright (C) 2008 The Android Open Source 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.
*/
#define ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <linux/kdev_t.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <libdm/dm.h>
#include <utils/Trace.h>
#include "Devmapper.h"
using android::base::StringPrintf;
using namespace android::dm;
static const char* kVoldPrefix = "vold:";
int Devmapper::create(const char* name_raw, const char* loopFile, const char* key,
unsigned long numSectors, char* ubuffer, size_t len) {
auto& dm = DeviceMapper::Instance();
auto name_string = StringPrintf("%s%s", kVoldPrefix, name_raw);
DmTable table;
table.Emplace<DmTargetCrypt>(0, numSectors, "twofish", key, 0, loopFile, 0);
if (!dm.CreateDevice(name_string, table)) {
LOG(ERROR) << "Failed to create device-mapper device " << name_string;
return -1;
}
std::string path;
if (!dm.GetDmDevicePathByName(name_string, &path)) {
LOG(ERROR) << "Failed to get device-mapper device path for " << name_string;
return -1;
}
snprintf(ubuffer, len, "%s", path.c_str());
return 0;
}
int Devmapper::destroy(const char* name_raw) {
auto& dm = DeviceMapper::Instance();
auto name_string = StringPrintf("%s%s", kVoldPrefix, name_raw);
if (!dm.DeleteDevice(name_string)) {
if (errno != ENXIO) {
PLOG(ERROR) << "Failed DM_DEV_REMOVE";
}
return -1;
}
return 0;
}
int Devmapper::destroyAll() {
ATRACE_NAME("Devmapper::destroyAll");
auto& dm = DeviceMapper::Instance();
std::vector<DeviceMapper::DmBlockDevice> devices;
if (!dm.GetAvailableDevices(&devices)) {
LOG(ERROR) << "Failed to get dm devices";
return -1;
}
for (const auto& device : devices) {
if (android::base::StartsWith(device.name(), kVoldPrefix)) {
LOG(DEBUG) << "Tearing down stale dm device named " << device.name();
if (!dm.DeleteDevice(device.name())) {
if (errno != ENXIO) {
PLOG(WARNING) << "Failed to destroy dm device named " << device.name();
}
}
}
}
return 0;
}