mirror of
https://github.com/SerenityOS/serenity
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ae2ec45e78
This is important for dmidecode because it does an fstat on the DMI blobs, trying to figure out their size. Because we already know the size of the blobs when creating the SysFS components, there's no performance penalty whatsoever, and this allows dmidecode to not use the /dev/mem device as a fallback.
67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/*
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* Copyright (c) 2021, 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/Error.h>
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#include <AK/Function.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Forward.h>
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namespace Kernel {
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struct SysFSInodeData : public OpenFileDescriptionData {
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OwnPtr<KBuffer> buffer;
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};
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class SysFSComponent : public RefCounted<SysFSComponent> {
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public:
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virtual StringView name() const = 0;
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { return Error::from_errno(ENOTIMPL); }
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
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virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
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virtual mode_t permissions() const;
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virtual ErrorOr<void> truncate(u64) { return EPERM; }
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virtual size_t size() const { return 0; }
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virtual ErrorOr<void> set_mtime(time_t) { return ENOTIMPL; }
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virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) { return EROFS; }
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virtual ErrorOr<void> refresh_data(OpenFileDescription&) const { return {}; }
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const&) const;
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InodeIndex component_index() const { return m_component_index; };
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virtual ~SysFSComponent() = default;
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protected:
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SysFSComponent();
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private:
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InodeIndex m_component_index {};
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};
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class SysFSDirectory : public SysFSComponent {
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public:
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
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protected:
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SysFSDirectory() = default;
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explicit SysFSDirectory(SysFSDirectory const& parent_directory);
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NonnullRefPtrVector<SysFSComponent> m_components;
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RefPtr<SysFSDirectory> m_parent_directory;
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};
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}
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