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Kernel: Introduce the DeviceManagement singleton

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This singleton simplifies many aspects that we struggled with before:
1. There's no need to make derived classes of Device expose the
constructor as public anymore. The singleton is a friend of them, so he
can call the constructor. This solves the issue with try_create_device
helper neatly, hopefully for good.
2. Getting a reference of the NullDevice is now being done from this
singleton, which means that NullDevice no longer needs to use its own
singleton, and we can apply the try_create_device helper on it too :)
3. We can now defer registration completely after the Device constructor
which means the Device constructor is merely assigning the major and
minor numbers of the Device, and the try_create_device helper ensures it
calls the after_inserting method immediately after construction. This
creates a great opportunity to make registration more OOM-safe.
This commit is contained in:
Liav A 2021-09-11 09:19:20 +03:00 • committed by Idan Horowitz
parent 9aa6dd6b78
commit aee4786d8e
43 changed files with 244 additions and 123 deletions
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3
Kernel/Storage/Partition/DiskPartition.cpp
View file

@ -5,6 +5,7 @@
*/
#include <Kernel/Debug.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/Storage/Partition/DiskPartition.h>
@ -12,7 +13,7 @@ namespace Kernel {
NonnullRefPtr<DiskPartition> DiskPartition::create(BlockDevice& device, unsigned minor_number, DiskPartitionMetadata metadata)
{
auto partition_or_error = try_create_device<DiskPartition>(device, minor_number, metadata);
auto partition_or_error = DeviceManagement::try_create_device<DiskPartition>(device, minor_number, metadata);
// FIXME: Find a way to propagate errors
VERIFY(!partition_or_error.is_error());
return partition_or_error.release_value();

6
Kernel/Storage/Partition/DiskPartition.h
View file

@ -14,6 +14,8 @@
namespace Kernel {
class DiskPartition final : public BlockDevice {
friend class DeviceManagement;
public:
static NonnullRefPtr<DiskPartition> create(BlockDevice&, unsigned, DiskPartitionMetadata);
virtual ~DiskPartition();
@ -28,10 +30,8 @@ public:
const DiskPartitionMetadata& metadata() const;
// FIXME: We expose this constructor to make try_create_device helper to work
DiskPartition(BlockDevice&, unsigned, DiskPartitionMetadata);
private:
DiskPartition(BlockDevice&, unsigned, DiskPartitionMetadata);
virtual StringView class_name() const override;
WeakPtr<BlockDevice> m_device;