mirror of
https://github.com/RGBCube/serenity
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1d4af51250
This is pretty inefficient for ext2fs. We walk the entire block group containing the inode, searching through every directory for an entry referencing this inode. It might be a good idea to cache this information somehow. I'm not sure how often we'll be searching for it. Obviously there are multiple caching layers missing in the file system.
52 lines
1.9 KiB
C++
52 lines
1.9 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 SyntheticFileSystem : public FileSystem {
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public:
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virtual ~SyntheticFileSystem() override;
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static RetainPtr<SyntheticFileSystem> create();
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virtual bool initialize() override;
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virtual const char* className() const override;
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virtual InodeIdentifier rootInode() const override;
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virtual bool writeInode(InodeIdentifier, const ByteBuffer&) override;
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virtual bool enumerateDirectoryInode(InodeIdentifier, Function<bool(const DirectoryEntry&)>) const override;
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virtual InodeMetadata inodeMetadata(InodeIdentifier) const override;
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virtual bool setModificationTime(InodeIdentifier, dword timestamp) override;
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virtual InodeIdentifier createInode(InodeIdentifier parentInode, const String& name, Unix::mode_t, unsigned size) override;
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virtual Unix::ssize_t readInodeBytes(InodeIdentifier, Unix::off_t offset, Unix::size_t count, byte* buffer, FileHandle*) const override;
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virtual InodeIdentifier makeDirectory(InodeIdentifier parentInode, const String& name, Unix::mode_t) override;
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virtual InodeIdentifier findParentOfInode(InodeIdentifier) const override;
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protected:
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typedef unsigned InodeIndex;
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InodeIndex generateInodeIndex();
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static constexpr InodeIndex RootInodeIndex = 1;
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SyntheticFileSystem();
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struct File {
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String name;
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InodeMetadata metadata;
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InodeIdentifier parent;
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ByteBuffer data;
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Function<ByteBuffer()> generator;
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Vector<File*> children;
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};
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OwnPtr<File> createDirectory(String&& name);
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OwnPtr<File> createTextFile(String&& name, String&& text);
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OwnPtr<File> createGeneratedFile(String&& name, Function<ByteBuffer()>&&);
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InodeIdentifier addFile(OwnPtr<File>&&, InodeIndex parent = RootInodeIndex);
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bool removeFile(InodeIndex);
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private:
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InodeIndex m_nextInodeIndex { 2 };
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HashMap<InodeIndex, OwnPtr<File>> m_inodes;
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};
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