db29503b4d
Now that backup metadata is stored at the start of the super partition,
this field is no longer needed. In actuality, it was not needed even
before then: both it and first_logical_sector exist for convenience,
since they can be re-derived at any time given an LpMetadataGeometry.
Bug: 116802789
Test: liblp_test gtest
device with dynamic partitions flashes and boots
Change-Id: I259a443097e689a0a9db7f822bbf1a52d40076dc
615 lines
22 KiB
C++
615 lines
22 KiB
C++
/*
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* Copyright (C) 2018 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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#include "liblp/builder.h"
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#if defined(__linux__)
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#include <linux/fs.h>
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#endif
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#include <string.h>
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#include <sys/ioctl.h>
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#include <algorithm>
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#include <android-base/unique_fd.h>
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#include "liblp/liblp.h"
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#include "reader.h"
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#include "utility.h"
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namespace android {
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namespace fs_mgr {
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bool GetBlockDeviceInfo(const std::string& block_device, BlockDeviceInfo* device_info) {
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#if defined(__linux__)
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android::base::unique_fd fd(open(block_device.c_str(), O_RDONLY));
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if (fd < 0) {
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PERROR << __PRETTY_FUNCTION__ << "open '" << block_device << "' failed";
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return false;
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}
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if (!GetDescriptorSize(fd, &device_info->size)) {
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return false;
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}
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if (ioctl(fd, BLKIOMIN, &device_info->alignment) < 0) {
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PERROR << __PRETTY_FUNCTION__ << "BLKIOMIN failed";
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return false;
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}
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int alignment_offset;
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if (ioctl(fd, BLKALIGNOFF, &alignment_offset) < 0) {
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PERROR << __PRETTY_FUNCTION__ << "BLKIOMIN failed";
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return false;
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}
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int logical_block_size;
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if (ioctl(fd, BLKSSZGET, &logical_block_size) < 0) {
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PERROR << __PRETTY_FUNCTION__ << "BLKSSZGET failed";
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return false;
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}
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device_info->alignment_offset = static_cast<uint32_t>(alignment_offset);
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device_info->logical_block_size = static_cast<uint32_t>(logical_block_size);
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return true;
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#else
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(void)block_device;
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(void)device_info;
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LERROR << __PRETTY_FUNCTION__ << ": Not supported on this operating system.";
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return false;
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#endif
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}
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void LinearExtent::AddTo(LpMetadata* out) const {
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out->extents.push_back(LpMetadataExtent{num_sectors_, LP_TARGET_TYPE_LINEAR, physical_sector_});
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}
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void ZeroExtent::AddTo(LpMetadata* out) const {
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out->extents.push_back(LpMetadataExtent{num_sectors_, LP_TARGET_TYPE_ZERO, 0});
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}
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Partition::Partition(const std::string& name, const std::string& group_name, uint32_t attributes)
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: name_(name), group_name_(group_name), attributes_(attributes), size_(0) {}
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void Partition::AddExtent(std::unique_ptr<Extent>&& extent) {
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size_ += extent->num_sectors() * LP_SECTOR_SIZE;
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if (LinearExtent* new_extent = extent->AsLinearExtent()) {
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if (!extents_.empty() && extents_.back()->AsLinearExtent() &&
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extents_.back()->AsLinearExtent()->end_sector() == new_extent->physical_sector()) {
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// If the previous extent can be merged into this new one, do so
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// to avoid creating unnecessary extents.
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LinearExtent* prev_extent = extents_.back()->AsLinearExtent();
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extent = std::make_unique<LinearExtent>(
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prev_extent->num_sectors() + new_extent->num_sectors(),
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prev_extent->physical_sector());
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extents_.pop_back();
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}
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}
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extents_.push_back(std::move(extent));
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}
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void Partition::RemoveExtents() {
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size_ = 0;
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extents_.clear();
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}
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void Partition::ShrinkTo(uint64_t aligned_size) {
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if (aligned_size == 0) {
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RemoveExtents();
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return;
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}
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// Remove or shrink extents of any kind until the total partition size is
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// equal to the requested size.
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uint64_t sectors_to_remove = (size_ - aligned_size) / LP_SECTOR_SIZE;
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while (sectors_to_remove) {
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Extent* extent = extents_.back().get();
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if (extent->num_sectors() > sectors_to_remove) {
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size_ -= sectors_to_remove * LP_SECTOR_SIZE;
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extent->set_num_sectors(extent->num_sectors() - sectors_to_remove);
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break;
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}
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size_ -= (extent->num_sectors() * LP_SECTOR_SIZE);
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sectors_to_remove -= extent->num_sectors();
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extents_.pop_back();
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}
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DCHECK(size_ == aligned_size);
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}
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uint64_t Partition::BytesOnDisk() const {
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uint64_t sectors = 0;
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for (const auto& extent : extents_) {
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if (!extent->AsLinearExtent()) {
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continue;
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}
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sectors += extent->num_sectors();
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}
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return sectors * LP_SECTOR_SIZE;
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}
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std::unique_ptr<MetadataBuilder> MetadataBuilder::New(const std::string& block_device,
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uint32_t slot_number) {
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std::unique_ptr<LpMetadata> metadata = ReadMetadata(block_device.c_str(), slot_number);
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if (!metadata) {
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return nullptr;
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}
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std::unique_ptr<MetadataBuilder> builder = New(*metadata.get());
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if (!builder) {
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return nullptr;
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}
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BlockDeviceInfo device_info;
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if (fs_mgr::GetBlockDeviceInfo(block_device, &device_info)) {
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builder->UpdateBlockDeviceInfo(device_info);
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}
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return builder;
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}
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std::unique_ptr<MetadataBuilder> MetadataBuilder::New(const BlockDeviceInfo& device_info,
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uint32_t metadata_max_size,
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uint32_t metadata_slot_count) {
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std::unique_ptr<MetadataBuilder> builder(new MetadataBuilder());
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if (!builder->Init(device_info, metadata_max_size, metadata_slot_count)) {
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return nullptr;
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}
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return builder;
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}
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std::unique_ptr<MetadataBuilder> MetadataBuilder::New(const LpMetadata& metadata) {
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std::unique_ptr<MetadataBuilder> builder(new MetadataBuilder());
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if (!builder->Init(metadata)) {
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return nullptr;
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}
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return builder;
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}
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MetadataBuilder::MetadataBuilder() {
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memset(&geometry_, 0, sizeof(geometry_));
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geometry_.magic = LP_METADATA_GEOMETRY_MAGIC;
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geometry_.struct_size = sizeof(geometry_);
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memset(&header_, 0, sizeof(header_));
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header_.magic = LP_METADATA_HEADER_MAGIC;
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header_.major_version = LP_METADATA_MAJOR_VERSION;
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header_.minor_version = LP_METADATA_MINOR_VERSION;
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header_.header_size = sizeof(header_);
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header_.partitions.entry_size = sizeof(LpMetadataPartition);
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header_.extents.entry_size = sizeof(LpMetadataExtent);
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header_.groups.entry_size = sizeof(LpMetadataPartitionGroup);
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}
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bool MetadataBuilder::Init(const LpMetadata& metadata) {
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geometry_ = metadata.geometry;
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for (const auto& group : metadata.groups) {
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std::string group_name = GetPartitionGroupName(group);
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if (!AddGroup(group_name, group.maximum_size)) {
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return false;
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}
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}
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for (const auto& partition : metadata.partitions) {
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std::string group_name = GetPartitionGroupName(metadata.groups[partition.group_index]);
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Partition* builder =
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AddPartition(GetPartitionName(partition), group_name, partition.attributes);
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if (!builder) {
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return false;
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}
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for (size_t i = 0; i < partition.num_extents; i++) {
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const LpMetadataExtent& extent = metadata.extents[partition.first_extent_index + i];
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if (extent.target_type == LP_TARGET_TYPE_LINEAR) {
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auto copy = std::make_unique<LinearExtent>(extent.num_sectors, extent.target_data);
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builder->AddExtent(std::move(copy));
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} else if (extent.target_type == LP_TARGET_TYPE_ZERO) {
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auto copy = std::make_unique<ZeroExtent>(extent.num_sectors);
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builder->AddExtent(std::move(copy));
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}
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}
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}
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return true;
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}
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bool MetadataBuilder::Init(const BlockDeviceInfo& device_info, uint32_t metadata_max_size,
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uint32_t metadata_slot_count) {
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if (metadata_max_size < sizeof(LpMetadataHeader)) {
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LERROR << "Invalid metadata maximum size.";
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return false;
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}
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if (metadata_slot_count == 0) {
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LERROR << "Invalid metadata slot count.";
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return false;
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}
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// Align the metadata size up to the nearest sector.
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metadata_max_size = AlignTo(metadata_max_size, LP_SECTOR_SIZE);
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// Check that device properties are sane.
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if (device_info.size % LP_SECTOR_SIZE != 0) {
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LERROR << "Block device size must be a multiple of 512.";
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return false;
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}
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if (device_info.logical_block_size % LP_SECTOR_SIZE != 0) {
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LERROR << "Logical block size must be a multiple of 512.";
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return false;
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}
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if (device_info.alignment_offset % LP_SECTOR_SIZE != 0) {
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LERROR << "Alignment offset is not sector-aligned.";
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return false;
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}
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if (device_info.alignment % LP_SECTOR_SIZE != 0) {
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LERROR << "Partition alignment is not sector-aligned.";
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return false;
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}
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if (device_info.alignment_offset > device_info.alignment) {
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LERROR << "Partition alignment offset is greater than its alignment.";
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return false;
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}
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// We reserve a geometry block (4KB) plus space for each copy of the
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// maximum size of a metadata blob. Then, we double that space since
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// we store a backup copy of everything.
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uint64_t reserved =
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LP_METADATA_GEOMETRY_SIZE + (uint64_t(metadata_max_size) * metadata_slot_count);
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uint64_t total_reserved = reserved * 2;
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if (device_info.size < total_reserved) {
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LERROR << "Attempting to create metadata on a block device that is too small.";
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return false;
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}
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// Compute the first free sector, factoring in alignment.
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uint64_t free_area_start =
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AlignTo(total_reserved, device_info.alignment, device_info.alignment_offset);
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uint64_t first_sector = free_area_start / LP_SECTOR_SIZE;
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// There must be one logical block of free space remaining (enough for one partition).
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uint64_t minimum_disk_size = (first_sector * LP_SECTOR_SIZE) + device_info.logical_block_size;
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if (device_info.size < minimum_disk_size) {
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LERROR << "Device must be at least " << minimum_disk_size << " bytes, only has "
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<< device_info.size;
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return false;
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}
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geometry_.first_logical_sector = first_sector;
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geometry_.metadata_max_size = metadata_max_size;
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geometry_.metadata_slot_count = metadata_slot_count;
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geometry_.alignment = device_info.alignment;
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geometry_.alignment_offset = device_info.alignment_offset;
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geometry_.block_device_size = device_info.size;
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geometry_.logical_block_size = device_info.logical_block_size;
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if (!AddGroup("default", 0)) {
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return false;
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}
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return true;
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}
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bool MetadataBuilder::AddGroup(const std::string& group_name, uint64_t maximum_size) {
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if (FindGroup(group_name)) {
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LERROR << "Group already exists: " << group_name;
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return false;
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}
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groups_.push_back(std::make_unique<PartitionGroup>(group_name, maximum_size));
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return true;
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}
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Partition* MetadataBuilder::AddPartition(const std::string& name, uint32_t attributes) {
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return AddPartition(name, "default", attributes);
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}
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Partition* MetadataBuilder::AddPartition(const std::string& name, const std::string& group_name,
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uint32_t attributes) {
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if (name.empty()) {
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LERROR << "Partition must have a non-empty name.";
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return nullptr;
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}
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if (FindPartition(name)) {
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LERROR << "Attempting to create duplication partition with name: " << name;
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return nullptr;
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}
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if (!FindGroup(group_name)) {
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LERROR << "Could not find partition group: " << group_name;
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return nullptr;
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}
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partitions_.push_back(std::make_unique<Partition>(name, group_name, attributes));
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return partitions_.back().get();
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}
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Partition* MetadataBuilder::FindPartition(const std::string& name) {
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for (const auto& partition : partitions_) {
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if (partition->name() == name) {
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return partition.get();
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}
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}
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return nullptr;
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}
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PartitionGroup* MetadataBuilder::FindGroup(const std::string& group_name) const {
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for (const auto& group : groups_) {
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if (group->name() == group_name) {
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return group.get();
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}
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}
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return nullptr;
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}
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uint64_t MetadataBuilder::TotalSizeOfGroup(PartitionGroup* group) const {
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uint64_t total = 0;
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for (const auto& partition : partitions_) {
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if (partition->group_name() != group->name()) {
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continue;
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}
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total += partition->BytesOnDisk();
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}
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return total;
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}
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void MetadataBuilder::RemovePartition(const std::string& name) {
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for (auto iter = partitions_.begin(); iter != partitions_.end(); iter++) {
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if ((*iter)->name() == name) {
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partitions_.erase(iter);
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return;
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}
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}
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}
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bool MetadataBuilder::GrowPartition(Partition* partition, uint64_t aligned_size) {
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PartitionGroup* group = FindGroup(partition->group_name());
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CHECK(group);
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// Figure out how much we need to allocate, and whether our group has
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// enough space remaining.
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uint64_t space_needed = aligned_size - partition->size();
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if (group->maximum_size() > 0) {
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uint64_t group_size = TotalSizeOfGroup(group);
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if (group_size >= group->maximum_size() ||
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group->maximum_size() - group_size < space_needed) {
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LERROR << "Partition " << partition->name() << " is part of group " << group->name()
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<< " which does not have enough space free (" << space_needed << "requested, "
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<< group_size << " used out of " << group->maximum_size();
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return false;
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}
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}
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uint64_t sectors_needed = space_needed / LP_SECTOR_SIZE;
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DCHECK(sectors_needed * LP_SECTOR_SIZE == space_needed);
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struct Interval {
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uint64_t start;
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uint64_t end;
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Interval(uint64_t start, uint64_t end) : start(start), end(end) {}
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uint64_t length() const { return end - start; }
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bool operator<(const Interval& other) const { return start < other.start; }
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};
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// Collect all extents in the partition table, then sort them by starting
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// sector.
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std::vector<Interval> extents;
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for (const auto& partition : partitions_) {
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for (const auto& extent : partition->extents()) {
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LinearExtent* linear = extent->AsLinearExtent();
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if (!linear) {
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continue;
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}
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extents.emplace_back(linear->physical_sector(),
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linear->physical_sector() + extent->num_sectors());
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}
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}
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std::sort(extents.begin(), extents.end());
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// Convert the extent list into a list of gaps between the extents; i.e.,
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// the list of ranges that are free on the disk.
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std::vector<Interval> free_regions;
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for (size_t i = 1; i < extents.size(); i++) {
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const Interval& previous = extents[i - 1];
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const Interval& current = extents[i];
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uint64_t aligned = AlignSector(previous.end);
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if (aligned >= current.start) {
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// There is no gap between these two extents, try the next one.
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// Note that we check with >= instead of >, since alignment may
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// bump the ending sector past the beginning of the next extent.
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continue;
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}
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// The new interval represents the free space starting at the end of
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// the previous interval, and ending at the start of the next interval.
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free_regions.emplace_back(aligned, current.start);
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}
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// Add a final interval representing the remainder of the free space.
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uint64_t last_free_extent_start =
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extents.empty() ? geometry_.first_logical_sector : extents.back().end;
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last_free_extent_start = AlignSector(last_free_extent_start);
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uint64_t last_sector = geometry_.block_device_size / LP_SECTOR_SIZE;
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if (last_free_extent_start < last_sector) {
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free_regions.emplace_back(last_free_extent_start, last_sector);
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}
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const uint64_t sectors_per_block = geometry_.logical_block_size / LP_SECTOR_SIZE;
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CHECK_NE(sectors_per_block, 0);
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CHECK(sectors_needed % sectors_per_block == 0);
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// Find gaps that we can use for new extents. Note we store new extents in a
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// temporary vector, and only commit them if we are guaranteed enough free
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// space.
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std::vector<std::unique_ptr<LinearExtent>> new_extents;
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for (auto& region : free_regions) {
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if (region.length() % sectors_per_block != 0) {
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// This should never happen, because it would imply that we
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// once allocated an extent that was not a multiple of the
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// block size. That extent would be rejected by DM_TABLE_LOAD.
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LERROR << "Region " << region.start << ".." << region.end
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<< " is not a multiple of the block size, " << sectors_per_block;
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// If for some reason the final region is mis-sized we still want
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// to be able to grow partitions. So just to be safe, round the
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// region down to the nearest block.
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region.end = region.start + (region.length() / sectors_per_block) * sectors_per_block;
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if (!region.length()) {
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continue;
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}
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}
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uint64_t sectors = std::min(sectors_needed, region.length());
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CHECK(sectors % sectors_per_block == 0);
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auto extent = std::make_unique<LinearExtent>(sectors, region.start);
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new_extents.push_back(std::move(extent));
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sectors_needed -= sectors;
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if (!sectors_needed) {
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break;
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}
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}
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if (sectors_needed) {
|
|
LERROR << "Not enough free space to expand partition: " << partition->name();
|
|
return false;
|
|
}
|
|
|
|
// Everything succeeded, so commit the new extents.
|
|
for (auto& extent : new_extents) {
|
|
partition->AddExtent(std::move(extent));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void MetadataBuilder::ShrinkPartition(Partition* partition, uint64_t aligned_size) {
|
|
partition->ShrinkTo(aligned_size);
|
|
}
|
|
|
|
std::unique_ptr<LpMetadata> MetadataBuilder::Export() {
|
|
std::unique_ptr<LpMetadata> metadata = std::make_unique<LpMetadata>();
|
|
metadata->header = header_;
|
|
metadata->geometry = geometry_;
|
|
|
|
std::map<std::string, size_t> group_indices;
|
|
for (const auto& group : groups_) {
|
|
LpMetadataPartitionGroup out = {};
|
|
|
|
if (group->name().size() > sizeof(out.name)) {
|
|
LERROR << "Partition group name is too long: " << group->name();
|
|
return nullptr;
|
|
}
|
|
strncpy(out.name, group->name().c_str(), sizeof(out.name));
|
|
out.maximum_size = group->maximum_size();
|
|
|
|
metadata->groups.push_back(out);
|
|
}
|
|
|
|
// Flatten the partition and extent structures into an LpMetadata, which
|
|
// makes it very easy to validate, serialize, or pass on to device-mapper.
|
|
for (const auto& partition : partitions_) {
|
|
LpMetadataPartition part;
|
|
memset(&part, 0, sizeof(part));
|
|
|
|
if (partition->name().size() > sizeof(part.name)) {
|
|
LERROR << "Partition name is too long: " << partition->name();
|
|
return nullptr;
|
|
}
|
|
if (partition->attributes() & ~(LP_PARTITION_ATTRIBUTE_MASK)) {
|
|
LERROR << "Partition " << partition->name() << " has unsupported attribute.";
|
|
return nullptr;
|
|
}
|
|
|
|
strncpy(part.name, partition->name().c_str(), sizeof(part.name));
|
|
part.first_extent_index = static_cast<uint32_t>(metadata->extents.size());
|
|
part.num_extents = static_cast<uint32_t>(partition->extents().size());
|
|
part.attributes = partition->attributes();
|
|
|
|
for (const auto& extent : partition->extents()) {
|
|
extent->AddTo(metadata.get());
|
|
}
|
|
metadata->partitions.push_back(part);
|
|
}
|
|
|
|
metadata->header.partitions.num_entries = static_cast<uint32_t>(metadata->partitions.size());
|
|
metadata->header.extents.num_entries = static_cast<uint32_t>(metadata->extents.size());
|
|
metadata->header.groups.num_entries = static_cast<uint32_t>(metadata->groups.size());
|
|
return metadata;
|
|
}
|
|
|
|
uint64_t MetadataBuilder::AllocatableSpace() const {
|
|
return geometry_.block_device_size - (geometry_.first_logical_sector * LP_SECTOR_SIZE);
|
|
}
|
|
|
|
uint64_t MetadataBuilder::UsedSpace() const {
|
|
uint64_t size = 0;
|
|
for (const auto& partition : partitions_) {
|
|
size += partition->size();
|
|
}
|
|
return size;
|
|
}
|
|
|
|
uint64_t MetadataBuilder::AlignSector(uint64_t sector) {
|
|
// Note: when reading alignment info from the Kernel, we don't assume it
|
|
// is aligned to the sector size, so we round up to the nearest sector.
|
|
uint64_t lba = sector * LP_SECTOR_SIZE;
|
|
uint64_t aligned = AlignTo(lba, geometry_.alignment, geometry_.alignment_offset);
|
|
return AlignTo(aligned, LP_SECTOR_SIZE) / LP_SECTOR_SIZE;
|
|
}
|
|
|
|
bool MetadataBuilder::GetBlockDeviceInfo(BlockDeviceInfo* info) const {
|
|
info->size = geometry_.block_device_size;
|
|
info->alignment = geometry_.alignment;
|
|
info->alignment_offset = geometry_.alignment_offset;
|
|
info->logical_block_size = geometry_.logical_block_size;
|
|
return true;
|
|
}
|
|
|
|
bool MetadataBuilder::UpdateBlockDeviceInfo(const BlockDeviceInfo& device_info) {
|
|
if (device_info.size != geometry_.block_device_size) {
|
|
LERROR << "Device size does not match (got " << device_info.size << ", expected "
|
|
<< geometry_.block_device_size << ")";
|
|
return false;
|
|
}
|
|
if (device_info.logical_block_size != geometry_.logical_block_size) {
|
|
LERROR << "Device logical block size does not match (got " << device_info.logical_block_size
|
|
<< ", expected " << geometry_.logical_block_size << ")";
|
|
return false;
|
|
}
|
|
|
|
// The kernel does not guarantee these values are present, so we only
|
|
// replace existing values if the new values are non-zero.
|
|
if (device_info.alignment) {
|
|
geometry_.alignment = device_info.alignment;
|
|
}
|
|
if (device_info.alignment_offset) {
|
|
geometry_.alignment_offset = device_info.alignment_offset;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool MetadataBuilder::ResizePartition(Partition* partition, uint64_t requested_size) {
|
|
// Align the space needed up to the nearest sector.
|
|
uint64_t aligned_size = AlignTo(requested_size, geometry_.logical_block_size);
|
|
uint64_t old_size = partition->size();
|
|
|
|
if (aligned_size > old_size) {
|
|
if (!GrowPartition(partition, aligned_size)) {
|
|
return false;
|
|
}
|
|
} else if (aligned_size < partition->size()) {
|
|
ShrinkPartition(partition, aligned_size);
|
|
}
|
|
|
|
if (partition->size() != old_size) {
|
|
LINFO << "Partition " << partition->name() << " will resize from " << old_size
|
|
<< " bytes to " << aligned_size << " bytes";
|
|
}
|
|
return true;
|
|
}
|
|
|
|
} // namespace fs_mgr
|
|
} // namespace android
|