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Kernel: Introduce a new partitioning subsystem

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The partitioning code was very outdated, and required a full refactor.
The new subsystem removes duplicated code and uses more AK containers.

The most important change is that all implementations of the
PartitionTable class conform to one interface, which made it possible
to remove unnecessary code in the EBRPartitionTable class.

Finding partitions is now done in the StorageManagement singleton,
instead of doing so in init.cpp.

Also, now we don't try to find partitions on demand - the kernel will
try to detect if a StorageDevice is partitioned, and if so, will check
what is the partition table, which could be MBR, GUID or EBR.
Then, it will create DiskPartitionMetadata object for each partition
that is available in the partition table. This object will be used
by the partition enumeration code to create a DiskPartition with the
correct minor number.
This commit is contained in:
Liav A 2020-12-26 16:53:30 +02:00 • committed by Andreas Kling
parent bc18712adf
commit 72b1998f0d
20 changed files with 639 additions and 561 deletions
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39
Kernel/Storage/Partition/EBRPartitionTable.h
View file

@ -26,46 +26,29 @@
#pragma once
#include <AK/NonnullOwnPtr.h>
#include <AK/RefPtr.h>
#include <AK/Result.h>
#include <AK/Vector.h>
#include <Kernel/Storage/Partition/DiskPartition.h>
#include <Kernel/Storage/Partition/MBRPartitionTable.h>
namespace Kernel {
struct [[gnu::packed]] EBRPartitionExtension
{
u8 unused_area[446];
MBRPartitionEntry entry;
MBRPartitionEntry next_chained_ebr_extension;
MBRPartitionEntry unused[2];
u16 mbr_signature;
};
class EBRPartitionTable {
struct EBRPartitionHeader;
class EBRPartitionTable : public MBRPartitionTable {
public:
explicit EBRPartitionTable(NonnullRefPtr<BlockDevice>);
~EBRPartitionTable();
bool initialize();
RefPtr<DiskPartition> partition(unsigned index);
static Result<NonnullOwnPtr<EBRPartitionTable>, PartitionTable::Error> try_to_initialize(const StorageDevice&);
explicit EBRPartitionTable(const StorageDevice&);
virtual bool is_valid() const override { return m_valid; };
virtual Type type() const override { return Type::EBR; };
private:
int index_of_ebr_container() const;
NonnullRefPtr<BlockDevice> m_device;
void search_extended_partition(const StorageDevice&, MBRPartitionTable&, u64, size_t limit);
const MBRPartitionHeader& header() const;
const EBRPartitionExtension& ebr_extension() const;
bool index_is_extended_partition(unsigned index) const;
RefPtr<DiskPartition> get_extended_partition(unsigned index);
RefPtr<DiskPartition> get_non_extended_partition(unsigned index);
u8 m_ebr_container_id { 0 };
size_t m_ebr_chained_extensions_count { 0 };
u8 m_cached_mbr_header[512];
u8 m_cached_ebr_header[512];
bool m_valid { false };
size_t m_partitions_count { 0 };
};
}