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1682f0b760
SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteBuffer.h>
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#include <Kernel/Storage/Partition/EBRPartitionTable.h>
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namespace Kernel {
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Result<NonnullOwnPtr<EBRPartitionTable>, PartitionTable::Error> EBRPartitionTable::try_to_initialize(const StorageDevice& device)
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{
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auto table = make<EBRPartitionTable>(device);
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if (table->is_protective_mbr())
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return { PartitionTable::Error::MBRProtective };
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if (!table->is_valid())
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return { PartitionTable::Error::Invalid };
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return table;
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}
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void EBRPartitionTable::search_extended_partition(const StorageDevice& device, MBRPartitionTable& checked_ebr, u64 current_block_offset, size_t limit)
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{
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if (limit == 0)
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return;
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// EBRs should not carry more than 2 partitions (because they need to form a linked list)
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VERIFY(checked_ebr.partitions_count() <= 2);
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auto checked_logical_partition = checked_ebr.partition(0);
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// If we are pointed to an invalid logical partition, something is seriously wrong.
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VERIFY(checked_logical_partition.has_value());
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m_partitions.append(checked_logical_partition.value().offset(current_block_offset));
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if (!checked_ebr.contains_ebr())
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return;
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current_block_offset += checked_ebr.partition(1).value().start_block();
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auto next_ebr = MBRPartitionTable::try_to_initialize(device, current_block_offset);
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if (!next_ebr)
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return;
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search_extended_partition(device, *next_ebr, current_block_offset, (limit - 1));
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}
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EBRPartitionTable::EBRPartitionTable(const StorageDevice& device)
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: MBRPartitionTable(device)
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{
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if (!is_header_valid())
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return;
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m_valid = true;
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VERIFY(partitions_count() == 0);
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auto& header = this->header();
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for (size_t index = 0; index < 4; index++) {
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auto& entry = header.entry[index];
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// Start enumerating all logical partitions
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if (entry.type == 0xf) {
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auto checked_ebr = MBRPartitionTable::try_to_initialize(device, entry.offset);
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if (!checked_ebr)
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continue;
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// It's quite unlikely to see that amount of partitions, so stop at 128 partitions.
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search_extended_partition(device, *checked_ebr, entry.offset, 128);
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continue;
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}
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if (entry.offset == 0x00) {
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continue;
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}
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auto partition_type = ByteBuffer::create_zeroed(sizeof(u8));
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partition_type.data()[0] = entry.type;
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m_partitions.append(DiskPartitionMetadata({ entry.offset, (entry.offset + entry.length), partition_type }));
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}
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}
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EBRPartitionTable::~EBRPartitionTable()
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{
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}
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}
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