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9cd0a34b5c
BlockDevice was the wrong name for this abstraction, since a block device is a type of file in a unix system, and we should use that name for that concept in the fs implementation.
75 lines
3 KiB
C++
75 lines
3 KiB
C++
#pragma once
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#include "DiskBackedFileSystem.h"
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#include "UnixTypes.h"
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#include <AK/Buffer.h>
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#include <AK/OwnPtr.h>
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struct ext2_group_desc;
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struct ext2_inode;
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struct ext2_super_block;
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class Ext2FileSystem final : public DiskBackedFileSystem {
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public:
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static RetainPtr<Ext2FileSystem> create(RetainPtr<DiskDevice>&&);
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virtual ~Ext2FileSystem() override;
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private:
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typedef unsigned BlockIndex;
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typedef unsigned GroupIndex;
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typedef unsigned InodeIndex;
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explicit Ext2FileSystem(RetainPtr<DiskDevice>&&);
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const ext2_super_block& superBlock() const;
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const ext2_group_desc& blockGroupDescriptor(unsigned groupIndex) const;
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unsigned firstBlockOfGroup(unsigned groupIndex) const;
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unsigned inodesPerBlock() const;
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unsigned inodesPerGroup() const;
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unsigned blocksPerGroup() const;
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unsigned inodeSize() const;
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OwnPtr<ext2_inode> lookupExt2Inode(unsigned) const;
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bool writeExt2Inode(unsigned, const ext2_inode&);
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ByteBuffer readBlockContainingInode(unsigned inode, unsigned& blockIndex, unsigned& offset) const;
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ByteBuffer readSuperBlock() const;
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bool writeSuperBlock(const ext2_super_block&);
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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, std::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) const override;
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virtual InodeIdentifier makeDirectory(InodeIdentifier parentInode, const String& name, Unix::mode_t) override;
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bool isDirectoryInode(unsigned) const;
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unsigned allocateInode(unsigned preferredGroup, unsigned expectedSize);
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Vector<BlockIndex> allocateBlocks(unsigned group, unsigned count);
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unsigned groupIndexFromInode(unsigned) const;
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Vector<unsigned> blockListForInode(const ext2_inode&) const;
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void dumpBlockBitmap(unsigned groupIndex) const;
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void dumpInodeBitmap(unsigned groupIndex) const;
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template<typename F> void traverseInodeBitmap(unsigned groupIndex, F) const;
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template<typename F> void traverseBlockBitmap(unsigned groupIndex, F) const;
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bool addInodeToDirectory(unsigned directoryInode, unsigned inode, const String& name, byte fileType);
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bool writeDirectoryInode(unsigned directoryInode, Vector<DirectoryEntry>&&);
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bool setInodeAllocationState(unsigned inode, bool);
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bool setBlockAllocationState(GroupIndex, BlockIndex, bool);
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bool modifyLinkCount(InodeIndex, int delta);
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unsigned m_blockGroupCount { 0 };
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mutable ByteBuffer m_cachedSuperBlock;
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mutable ByteBuffer m_cachedBlockGroupDescriptorTable;
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};
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