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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.
76 lines
3.1 KiB
C++
76 lines
3.1 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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virtual bool initialize() 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 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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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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