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bda0c935c2
This patch adds most of the plumbing for working file deletion in Ext2FS. Directory entries are removed and inode link counts updated. We don't yet update the inode or block bitmaps, I will do that separately.
90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
#pragma once
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#include "FileSystem.h"
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#include "UnixTypes.h"
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#include <AK/HashMap.h>
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class SynthFSInode;
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class SynthFS : public FS {
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public:
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virtual ~SynthFS() override;
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static RetainPtr<SynthFS> 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> create_inode(InodeIdentifier parentInode, const String& name, Unix::mode_t, unsigned size, int& error) override;
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virtual RetainPtr<Inode> create_directory(InodeIdentifier parentInode, const String& name, Unix::mode_t, int& error) override;
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virtual RetainPtr<Inode> get_inode(InodeIdentifier) const override;
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protected:
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typedef unsigned InodeIndex;
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InodeIndex generate_inode_index();
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static constexpr InodeIndex RootInodeIndex = 1;
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SynthFS();
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RetainPtr<SynthFSInode> create_directory(String&& name);
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RetainPtr<SynthFSInode> create_text_file(String&& name, ByteBuffer&&, Unix::mode_t = 0010644);
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RetainPtr<SynthFSInode> create_generated_file(String&& name, Function<ByteBuffer(SynthFSInode&)>&&, Unix::mode_t = 0100644);
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RetainPtr<SynthFSInode> create_generated_file(String&& name, Function<ByteBuffer(SynthFSInode&)>&&, Function<ssize_t(SynthFSInode&, const ByteBuffer&)>&&, Unix::mode_t = 0100644);
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InodeIdentifier add_file(RetainPtr<SynthFSInode>&&, InodeIndex parent = RootInodeIndex);
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bool remove_file(InodeIndex);
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private:
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InodeIndex m_next_inode_index { 2 };
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HashMap<InodeIndex, RetainPtr<SynthFSInode>> m_inodes;
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};
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struct SynthFSInodeCustomData {
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virtual ~SynthFSInodeCustomData();
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};
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class SynthFSInode final : public Inode {
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friend class SynthFS;
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public:
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virtual ~SynthFSInode() override;
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void set_custom_data(OwnPtr<SynthFSInodeCustomData>&& custom_data) { m_custom_data = move(custom_data); }
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SynthFSInodeCustomData* custom_data() { return m_custom_data.ptr(); }
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const SynthFSInodeCustomData* 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(Unix::off_t, size_t, byte* buffer, FileDescriptor*) override;
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virtual InodeMetadata metadata() const override;
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virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) 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 bool write(const ByteBuffer&) override;
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virtual bool add_child(InodeIdentifier child_id, const String& name, byte file_type, int& error) override;
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virtual bool remove_child(const String& name, int& error) override;
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virtual RetainPtr<Inode> parent() const override;
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SynthFS& fs();
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const SynthFS& fs() const;
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SynthFSInode(SynthFS&, unsigned index);
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String m_name;
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InodeIdentifier m_parent;
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ByteBuffer m_data;
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Function<ByteBuffer(SynthFSInode&)> m_generator;
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Function<ssize_t(SynthFSInode&, const ByteBuffer&)> m_write_callback;
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Vector<SynthFSInode*> m_children;
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InodeMetadata m_metadata;
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OwnPtr<SynthFSInodeCustomData> m_custom_data;
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};
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inline SynthFS& SynthFSInode::fs()
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{
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return static_cast<SynthFS&>(Inode::fs());
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}
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inline const SynthFS& SynthFSInode::fs() const
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{
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return static_cast<const SynthFS&>(Inode::fs());
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}
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