mirror of
https://github.com/RGBCube/serenity
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c56e1c5378
Since the ProcFS doesn't hold many global objects within it, the need for a fully-structured design of backing components and a registry like with the SysFS is no longer true. To acommodate this, let's remove all backing store and components of the ProcFS, so now it resembles what we had in the early days of ProcFS in the project - a mostly-static filesystem, with very small amount of kmalloc allocations needed. We still use the inode index mechanism to understand the role of each inode, but this is done in a much "static"ier way than before.
82 lines
3.3 KiB
C++
82 lines
3.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022-2023, 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 <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/FileSystem/ProcFS/Definitions.h>
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#include <Kernel/FileSystem/ProcFS/FileSystem.h>
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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struct ProcFSInodeData : public OpenFileDescriptionData {
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OwnPtr<KBuffer> buffer;
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};
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class ProcFSInode final : public Inode {
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friend class ProcFS;
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public:
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enum class Type {
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RootDirectory,
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SelfProcessLink,
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ProcessProperty,
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ProcessDirectory,
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ProcessSubdirectory,
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};
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static InodeIndex create_index_from_global_directory_entry(segmented_global_inode_index entry);
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static InodeIndex create_index_from_process_directory_entry(ProcessID pid, segmented_process_directory_entry entry);
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virtual ~ProcFSInode() override;
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private:
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ProcFSInode(ProcFS const&, InodeIndex);
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ProcFS& procfs() { return static_cast<ProcFS&>(Inode::fs()); }
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ProcFS const& procfs() const { return static_cast<ProcFS const&>(Inode::fs()); }
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// ^Inode (EROFS handling)
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virtual ErrorOr<NonnullLockRefPtr<Inode>> create_child(StringView, mode_t, dev_t, UserID, GroupID) override { return EROFS; }
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virtual ErrorOr<void> add_child(Inode&, StringView, mode_t) override { return EROFS; }
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virtual ErrorOr<void> remove_child(StringView) override { return EROFS; }
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virtual ErrorOr<void> replace_child(StringView, Inode&) override { return EROFS; }
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virtual ErrorOr<void> chmod(mode_t) override { return EROFS; }
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virtual ErrorOr<void> chown(UserID, GroupID) override { return EROFS; }
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) override { return EROFS; }
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virtual ErrorOr<void> truncate(u64) override { return EROFS; }
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// ^Inode (Silent ignore handling)
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virtual ErrorOr<void> flush_metadata() override { return {}; }
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virtual ErrorOr<void> update_timestamps(Optional<Time>, Optional<Time>, Optional<Time>) override { return {}; }
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// ^Inode
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virtual ErrorOr<void> attach(OpenFileDescription& description) override;
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virtual void did_seek(OpenFileDescription&, off_t) override;
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ErrorOr<void> traverse_as_root_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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ErrorOr<NonnullLockRefPtr<Inode>> lookup_as_root_directory(StringView name);
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virtual ErrorOr<NonnullLockRefPtr<Inode>> lookup(StringView name) override final;
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ErrorOr<void> refresh_process_property_data(OpenFileDescription& description);
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ErrorOr<void> try_fetch_process_property_data(NonnullLockRefPtr<Process>, KBufferBuilder& builder) const;
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Type m_type;
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Optional<ProcessID> const m_associated_pid {};
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u16 const m_subdirectory { 0 };
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u32 const m_property { 0 };
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mutable Mutex m_refresh_lock;
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};
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}
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