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1dbd32488f
This change in fact does the following:
1. Use support for symlinks between /sys/dev/block/ storage device
identifier nodes and devices in /sys/devices/storage/{LUN}.
2. Add basic nodes in a /sys/devices/storage/{LUN} directory, to let
userspace to know about the device and its details.
110 lines
4.3 KiB
C++
110 lines
4.3 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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#pragma once
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#include <AK/IntrusiveList.h>
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/Interrupts/IRQHandler.h>
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#include <Kernel/Locking/Mutex.h>
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#include <Kernel/Storage/Partition/DiskPartition.h>
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#include <Kernel/Storage/StorageController.h>
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namespace Kernel {
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class StorageDevice : public BlockDevice {
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friend class StorageManagement;
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friend class DeviceManagement;
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public:
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// Note: this attribute describes the internal command set of a Storage device.
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// For example, an ordinary harddrive utilizes the ATA command set, while
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// an ATAPI device (e.g. Optical drive) that is connected to the ATA bus,
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// is actually using SCSI commands (packets) encapsulated inside an ATA command.
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// The IDE controller code being aware of the possibility of ATAPI devices attached
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// to the ATA bus, will check whether the Command set is ATA or SCSI and will act
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// accordingly.
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enum class CommandSet {
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PlainMemory,
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SCSI,
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ATA,
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NVMe,
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};
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// Note: this attribute describes the interface type of a Storage device.
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// For example, an ordinary harddrive utilizes the ATA command set, while
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// an ATAPI device (e.g. Optical drive) that is connected to the ATA bus,
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// is actually using SCSI commands (packets) encapsulated inside an ATA command.
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// Therefore, an ATAPI device is still using the ATA interface.
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enum class InterfaceType {
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PlainMemory,
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SCSI,
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ATA,
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NVMe,
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};
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// Note: The most reliable way to address this device from userspace interfaces,
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// such as SysFS, is to have one way to enumerate everything in the eyes of userspace.
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// Therefore, SCSI LUN (logical unit number) addressing seem to be the most generic way to do this.
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// For example, on a legacy ATA instance, one might connect an harddrive to the second IDE controller,
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// to the Primary channel as a slave device, which translates to LUN 1:0:1.
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// On NVMe, for example, connecting a second PCIe NVMe storage device as a sole NVMe namespace translates
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// to LUN 1:0:0.
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// TODO: LUNs are also useful also when specifying the boot drive on boot. Consider doing that.
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struct LUNAddress {
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u32 controller_id;
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u32 target_id;
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u32 disk_id;
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};
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public:
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virtual u64 max_addressable_block() const { return m_max_addressable_block; }
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// ^BlockDevice
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual bool can_read(OpenFileDescription const&, u64) const override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
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virtual bool can_write(OpenFileDescription const&, u64) const override;
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virtual void prepare_for_unplug() { m_partitions.clear(); }
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// FIXME: Remove this method after figuring out another scheme for naming.
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StringView early_storage_name() const;
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NonnullRefPtrVector<DiskPartition> const& partitions() const { return m_partitions; }
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void add_partition(NonnullRefPtr<DiskPartition> disk_partition) { MUST(m_partitions.try_append(disk_partition)); }
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LUNAddress const& logical_unit_number_address() const { return m_logical_unit_number_address; }
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virtual CommandSet command_set() const = 0;
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StringView interface_type_to_string_view() const;
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StringView command_set_to_string_view() const;
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// ^File
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virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) final;
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protected:
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StorageDevice(LUNAddress, MajorNumber, MinorNumber, size_t, u64, NonnullOwnPtr<KString>);
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// ^DiskDevice
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virtual StringView class_name() const override;
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private:
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virtual void after_inserting() override;
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virtual void will_be_destroyed() override;
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virtual InterfaceType interface_type() const = 0;
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mutable IntrusiveListNode<StorageDevice, RefPtr<StorageDevice>> m_list_node;
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NonnullRefPtrVector<DiskPartition> m_partitions;
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// FIXME: Remove this method after figuring out another scheme for naming.
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NonnullOwnPtr<KString> m_early_storage_device_name;
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LUNAddress const m_logical_unit_number_address;
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u64 m_max_addressable_block { 0 };
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size_t m_blocks_per_page { 0 };
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};
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}
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