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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022-2023, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/FileSystem/ProcFS/Definitions.h>
#include <Kernel/FileSystem/ProcFS/FileSystem.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
struct ProcFSInodeData : public OpenFileDescriptionData {
OwnPtr<KBuffer> buffer;
};
class ProcFSInode final : public Inode {
friend class ProcFS;
public:
enum class Type {
RootDirectory,
SelfProcessLink,
ProcessProperty,
ProcessDirectory,
ProcessSubdirectory,
};
static InodeIndex create_index_from_global_directory_entry(segmented_global_inode_index entry);
static InodeIndex create_index_from_process_directory_entry(ProcessID pid, segmented_process_directory_entry entry);
virtual ~ProcFSInode() override;
private:
ProcFSInode(ProcFS const&, InodeIndex);
ProcFS& procfs() { return static_cast<ProcFS&>(Inode::fs()); }
ProcFS const& procfs() const { return static_cast<ProcFS const&>(Inode::fs()); }
// ^Inode (EROFS handling)
virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView, mode_t, dev_t, UserID, GroupID) override { return EROFS; }
virtual ErrorOr<void> add_child(Inode&, StringView, mode_t) override { return EROFS; }
virtual ErrorOr<void> remove_child(StringView) override { return EROFS; }
virtual ErrorOr<void> replace_child(StringView, Inode&) override { return EROFS; }
virtual ErrorOr<void> chmod(mode_t) override { return EROFS; }
virtual ErrorOr<void> chown(UserID, GroupID) override { return EROFS; }
virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) override { return EROFS; }
virtual ErrorOr<void> truncate(u64) override { return EROFS; }
// ^Inode (Silent ignore handling)
virtual ErrorOr<void> flush_metadata() override { return {}; }
virtual ErrorOr<void> update_timestamps(Optional<Time>, Optional<Time>, Optional<Time>) override { return {}; }
// ^Inode
virtual ErrorOr<void> attach(OpenFileDescription& description) override;
virtual void did_seek(OpenFileDescription&, off_t) override;
ErrorOr<void> traverse_as_root_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual InodeMetadata metadata() const override;
virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
ErrorOr<NonnullRefPtr<Inode>> lookup_as_root_directory(StringView name);
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override final;
ErrorOr<void> refresh_process_property_data(OpenFileDescription& description);
ErrorOr<void> try_fetch_process_property_data(NonnullLockRefPtr<Process>, KBufferBuilder& builder) const;
Type m_type;
Optional<ProcessID> const m_associated_pid {};
u16 const m_subdirectory { 0 };
u32 const m_property { 0 };
mutable Mutex m_refresh_lock;
};
}
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