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https://github.com/RGBCube/serenity
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f8489da8ee
Normally, trying to truncate a SysFSInode should result in EPERM error. However, as suggested by Ali (@alimpfard), we can allow the PowerState node to be "truncated" so one can open that file with O_TRUNC option. Likewise, we also need to provide a way to set modified time on SysFS inodes. For most inodes, we should return ENOTIMPL error, but for the power state switch, we ignore the modified time setting and just return KSuccess. These fixes allow to do "echo -n 1 > /sys/firmware/power_state" in Shell after gaining root permissions, to switch the power state.
66 lines
2.3 KiB
C++
66 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/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/API/KResult.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 { return m_name->view(); }
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virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { VERIFY_NOT_REACHED(); }
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virtual KResult traverse_as_directory(unsigned, Function<bool(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 KResult truncate(u64) { return EPERM; }
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virtual KResult set_mtime(time_t) { return ENOTIMPL; }
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virtual KResultOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) { return EROFS; }
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virtual KResult refresh_data(OpenFileDescription&) const { return KSuccess; }
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virtual KResultOr<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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explicit SysFSComponent(StringView name);
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private:
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NonnullOwnPtr<KString> m_name;
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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 KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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virtual KResultOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
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protected:
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explicit SysFSDirectory(StringView name);
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SysFSDirectory(StringView name, 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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