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99 lines
3.9 KiB
C++
99 lines
3.9 KiB
C++
#pragma once
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#include <AK/Lock.h>
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#include <AK/Types.h>
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#include <Kernel/FileSystem.h>
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class Process;
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class ProcFSInode;
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class ProcFS final : public FS {
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friend class ProcFSInode;
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public:
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[[gnu::pure]] static ProcFS& the();
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virtual ~ProcFS() override;
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static Retained<ProcFS> create();
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virtual bool initialize() override;
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virtual const char* class_name() const override;
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virtual InodeIdentifier root_inode() const override;
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virtual RetainPtr<Inode> get_inode(InodeIdentifier) const override;
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virtual RetainPtr<Inode> create_inode(InodeIdentifier parent_id, const String& name, mode_t, unsigned size, int& error) override;
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virtual RetainPtr<Inode> create_directory(InodeIdentifier parent_id, const String& name, mode_t, int& error) override;
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void add_sys_file(String&&, Function<ByteBuffer(ProcFSInode&)>&& read_callback, Function<ssize_t(ProcFSInode&, const ByteBuffer&)>&& write_callback);
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void add_sys_bool(String&&, Lockable<bool>&, Function<void()>&& notify_callback = nullptr);
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void add_sys_string(String&&, Lockable<String>&, Function<void()>&& notify_callback = nullptr);
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private:
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ProcFS();
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struct ProcFSDirectoryEntry {
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ProcFSDirectoryEntry() { }
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ProcFSDirectoryEntry(const char* a_name, unsigned a_proc_file_type, Function<ByteBuffer(InodeIdentifier)>&& a_read_callback = nullptr, Function<ssize_t(InodeIdentifier, const ByteBuffer&)>&& a_write_callback = nullptr, RetainPtr<ProcFSInode>&& a_inode = nullptr)
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: name(a_name)
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, proc_file_type(a_proc_file_type)
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, read_callback(move(a_read_callback))
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, write_callback(move(a_write_callback))
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, inode(move(a_inode))
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{
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}
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const char* name { nullptr };
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unsigned proc_file_type { 0 };
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Function<ByteBuffer(InodeIdentifier)> read_callback;
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Function<ssize_t(InodeIdentifier, const ByteBuffer&)> write_callback;
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RetainPtr<ProcFSInode> inode;
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InodeIdentifier identifier(unsigned fsid) const;
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};
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ProcFSDirectoryEntry* get_directory_entry(InodeIdentifier) const;
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Vector<ProcFSDirectoryEntry> m_entries;
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Vector<ProcFSDirectoryEntry> m_sys_entries;
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mutable Lock m_inodes_lock;
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mutable HashMap<unsigned, ProcFSInode*> m_inodes;
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RetainPtr<ProcFSInode> m_root_inode;
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};
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struct ProcFSInodeCustomData {
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virtual ~ProcFSInodeCustomData();
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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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virtual ~ProcFSInode() override;
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void set_custom_data(OwnPtr<ProcFSInodeCustomData>&& custom_data) { m_custom_data = move(custom_data); }
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ProcFSInodeCustomData* custom_data() { return m_custom_data.ptr(); }
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const ProcFSInodeCustomData* custom_data() const { return m_custom_data.ptr(); }
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private:
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// ^Inode
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virtual ssize_t read_bytes(off_t, ssize_t, byte* buffer, FileDescriptor*) const override;
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virtual InodeMetadata metadata() const override;
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virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) const override;
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virtual InodeIdentifier lookup(const String& name) override;
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virtual String reverse_lookup(InodeIdentifier) override;
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virtual void flush_metadata() override;
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virtual ssize_t write_bytes(off_t, ssize_t, const byte* buffer, FileDescriptor*) override;
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virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) override;
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virtual KResult remove_child(const String& name) override;
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virtual RetainPtr<Inode> parent() const override;
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virtual size_t directory_entry_count() const override;
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virtual KResult chmod(mode_t) override;
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virtual KResult chown(uid_t, gid_t) override;
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ProcFS& fs() { return static_cast<ProcFS&>(Inode::fs()); }
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const ProcFS& fs() const { return static_cast<const ProcFS&>(Inode::fs()); }
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ProcFSInode(ProcFS&, unsigned index);
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OwnPtr<ProcFSInodeCustomData> m_custom_data;
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};
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