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Kernel/Storage: Restore booting from MBR partitions functionality

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We had such functionality in the past, but it was regressed and now is
restored.
This commit is contained in:
Liav A 2021-11-27 09:10:10 +02:00 • committed by Andreas Kling
parent cf4fa936be
commit ed5a4f2938
2 changed files with 16 additions and 1 deletions
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2
Kernel/Storage/StorageDevice.h
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@ -46,7 +46,7 @@ public:
// FIXME: Remove this method after figuring out another scheme for naming.
StringView early_storage_name() const;
NonnullRefPtrVector<DiskPartition> partitions() const { return m_partitions; }
NonnullRefPtrVector<DiskPartition> const& partitions() const { return m_partitions; }
virtual CommandSet command_set() const = 0;

15
Kernel/Storage/StorageManagement.cpp
View file

@ -128,6 +128,21 @@ UNMAP_AFTER_INIT void StorageManagement::determine_boot_device()
for (auto& storage_device : m_storage_devices) {
if (storage_device.early_storage_name() == storage_name) {
m_boot_block_device = storage_device;
break;
}
auto start_storage_name = storage_name.substring_view(0, min(storage_device.early_storage_name().length(), storage_name.length()));
if (storage_device.early_storage_name().starts_with(start_storage_name)) {
StringView partition_sign = storage_name.substring_view(start_storage_name.length());
auto possible_partition_number = partition_sign.to_uint<size_t>();
if (!possible_partition_number.has_value())
break;
if (possible_partition_number.value() == 0)
break;
if (storage_device.partitions().size() < possible_partition_number.value())
break;
m_boot_block_device = storage_device.partitions()[possible_partition_number.value() - 1];
break;
}
}
}