b92247368a
This mostly 1:1 replaces manual ioctls to device-mapper with calls to
libdm. There were two exceptions:
(1) There is a very old table-load-retry loop to workaround issues with
umount (b/7220345). This loop has been preserved, however, it now
includes DM_DEV_CREATE as well as DM_TABLE_LOAD.
(2) There was some ancient code to set DM_DEV_GEOMETRY for obb
dm-devices. This never did anything since geometry must be set after
loading a table. When setting it before (as vold was doing), the
subsequent DM_TABLE_LOAD will clear it.
Bug: 132206403
Test: FBE device boots
FBE device w/ metadata encryption boots
FDE device boots
atest StorageManagerIntegrationTest
Change-Id: Ib6db6b47329f093ac7084edaf604eddace8b9ac6
102 lines
3 KiB
C++
102 lines
3 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <linux/kdev_t.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include <libdm/dm.h>
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#include <utils/Trace.h>
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#include "Devmapper.h"
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using android::base::StringPrintf;
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using namespace android::dm;
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static const char* kVoldPrefix = "vold:";
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int Devmapper::create(const char* name_raw, const char* loopFile, const char* key,
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unsigned long numSectors, char* ubuffer, size_t len) {
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auto& dm = DeviceMapper::Instance();
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auto name_string = StringPrintf("%s%s", kVoldPrefix, name_raw);
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DmTable table;
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table.Emplace<DmTargetCrypt>(0, numSectors, "twofish", key, 0, loopFile, 0);
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if (!dm.CreateDevice(name_string, table)) {
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LOG(ERROR) << "Failed to create device-mapper device " << name_string;
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return -1;
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}
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std::string path;
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if (!dm.GetDmDevicePathByName(name_string, &path)) {
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LOG(ERROR) << "Failed to get device-mapper device path for " << name_string;
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return -1;
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}
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snprintf(ubuffer, len, "%s", path.c_str());
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return 0;
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}
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int Devmapper::destroy(const char* name_raw) {
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auto& dm = DeviceMapper::Instance();
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auto name_string = StringPrintf("%s%s", kVoldPrefix, name_raw);
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if (!dm.DeleteDevice(name_string)) {
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if (errno != ENXIO) {
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PLOG(ERROR) << "Failed DM_DEV_REMOVE";
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}
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return -1;
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}
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return 0;
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}
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int Devmapper::destroyAll() {
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ATRACE_NAME("Devmapper::destroyAll");
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auto& dm = DeviceMapper::Instance();
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std::vector<DeviceMapper::DmBlockDevice> devices;
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if (!dm.GetAvailableDevices(&devices)) {
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LOG(ERROR) << "Failed to get dm devices";
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return -1;
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}
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for (const auto& device : devices) {
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if (android::base::StartsWith(device.name(), kVoldPrefix)) {
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LOG(DEBUG) << "Tearing down stale dm device named " << device.name();
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if (!dm.DeleteDevice(device.name())) {
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if (errno != ENXIO) {
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PLOG(WARNING) << "Failed to destroy dm device named " << device.name();
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}
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}
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} else {
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LOG(DEBUG) << "Found unmanaged dm device named " << device.name();
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}
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}
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return 0;
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}
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