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Kernel: Allow to boot from a partition with partition UUID

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Instead of specifying the boot argument to be root=/dev/hdXY, now
one can write root=PARTUUID= with the right UUID, and if the partition
is found, the kernel will boot from it.

This feature is mainly used with GUID partitions, and is considered to
be the most reliable way for the kernel to identify partitions.
This commit is contained in:
Liav A 2020-12-31 13:17:03 +02:00 • committed by Andreas Kling
parent d22d29a29a
commit 9dc8bea3e7
9 changed files with 162 additions and 62 deletions
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31
Kernel/Storage/Partition/DiskPartitionMetadata.h
View file

@ -27,14 +27,33 @@
#pragma once
#include <AK/RefPtr.h>
#include <AK/UUID.h>
#include <Kernel/Devices/BlockDevice.h>
namespace Kernel {
class DiskPartitionMetadata {
private:
class PartitionType {
friend class DiskPartitionMetadata;
public:
explicit PartitionType(u8 partition_type);
explicit PartitionType(Array<u8, 16> partition_type);
UUID to_uuid() const;
u8 to_byte_indicator() const;
bool is_uuid() const;
bool is_valid() const;
private:
Array<u8, 16> m_partition_type {};
bool m_partition_type_is_uuid { false };
};
public:
DiskPartitionMetadata(u64 block_offset, u64 block_limit, ByteBuffer partition_type);
DiskPartitionMetadata(u64 block_offset, u64 block_limit, ByteBuffer partition_type, ByteBuffer unique_guid, u64 special_attributes, String name);
DiskPartitionMetadata(u64 block_offset, u64 block_limit, u8 partition_type);
DiskPartitionMetadata(u64 start_block, u64 end_block, Array<u8, 16> partition_type);
DiskPartitionMetadata(u64 block_offset, u64 block_limit, Array<u8, 16> partition_type, UUID unique_guid, u64 special_attributes, String name);
u64 start_block() const;
u64 end_block() const;
@ -42,14 +61,14 @@ public:
Optional<u64> special_attributes() const;
Optional<String> name() const;
Optional<ByteBuffer> partition_type() const;
Optional<ByteBuffer> unique_guid() const;
const PartitionType& type() const;
const UUID& unique_guid() const;
private:
u64 m_start_block;
u64 m_end_block;
ByteBuffer m_partition_type;
ByteBuffer m_unique_guid;
PartitionType m_type;
UUID m_unique_guid {};
u64 m_attributes { 0 };
String m_name;
};