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.
127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
#pragma once
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/RetainPtr.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <AK/Lock.h>
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#include <AK/Function.h>
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#include "InodeIdentifier.h"
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#include "InodeMetadata.h"
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#include "Limits.h"
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#include "FileSystem.h"
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class CharacterDevice;
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class FileHandle;
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class VirtualFileSystem {
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public:
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static void initializeGlobals();
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static SpinLock& lock();
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class Mount {
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public:
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Mount(InodeIdentifier host, RetainPtr<FileSystem>&&);
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InodeIdentifier host() const { return m_host; }
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InodeIdentifier guest() const { return m_guest; }
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const FileSystem& fileSystem() const { return *m_fileSystem; }
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private:
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InodeIdentifier m_host;
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InodeIdentifier m_guest;
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RetainPtr<FileSystem> m_fileSystem;
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};
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struct Node {
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InodeIdentifier inode;
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const InodeMetadata& metadata() const;
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bool inUse() const { return inode.isValid(); }
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bool isCharacterDevice() const { return m_characterDevice; }
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CharacterDevice* characterDevice() { return m_characterDevice; }
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void retain();
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void release();
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FileSystem* fileSystem() { return inode.fileSystem(); }
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const FileSystem* fileSystem() const { return inode.fileSystem(); }
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VirtualFileSystem* vfs() { return m_vfs; }
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const VirtualFileSystem* vfs() const { return m_vfs; }
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private:
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friend class VirtualFileSystem;
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VirtualFileSystem* m_vfs { nullptr };
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unsigned retainCount { 0 };
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CharacterDevice* m_characterDevice { nullptr };
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mutable InodeMetadata m_cachedMetadata;
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};
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static VirtualFileSystem& the() PURE;
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VirtualFileSystem();
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~VirtualFileSystem();
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bool isDirectory(const String& path, InodeIdentifier base = InodeIdentifier());
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void listDirectory(const String& path);
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void listDirectoryRecursively(const String& path);
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unsigned maxNodeCount() const { return m_maxNodeCount; }
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unsigned allocatedNodeCount() const { return m_maxNodeCount - m_nodeFreeList.size(); }
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Node* root() { return m_rootNode.ptr(); }
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const Node* root() const { return m_rootNode.ptr(); }
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bool mountRoot(RetainPtr<FileSystem>&&);
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bool mount(RetainPtr<FileSystem>&&, const String& path);
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OwnPtr<FileHandle> open(const String& path, InodeIdentifier base = InodeIdentifier());
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OwnPtr<FileHandle> create(const String& path, InodeIdentifier base = InodeIdentifier());
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OwnPtr<FileHandle> mkdir(const String& path, InodeIdentifier base = InodeIdentifier());
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bool isRoot(InodeIdentifier) const;
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bool touch(const String&path);
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void registerCharacterDevice(unsigned major, unsigned minor, CharacterDevice&);
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size_t mountCount() const { return m_mounts.size(); }
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void forEachMount(Function<void(const Mount&)>) const;
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String absolutePath(InodeIdentifier);
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private:
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friend class FileHandle;
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void enumerateDirectoryInode(InodeIdentifier, Function<bool(const FileSystem::DirectoryEntry&)>);
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InodeIdentifier resolvePath(const String& path, InodeIdentifier base = InodeIdentifier());
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InodeIdentifier resolveSymbolicLink(const String& basePath, InodeIdentifier symlinkInode);
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RetainPtr<Node> allocateNode();
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void freeNode(Node*);
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RetainPtr<Node> makeNode(InodeIdentifier);
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RetainPtr<Node> getOrCreateNode(InodeIdentifier);
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Mount* findMountForHost(InodeIdentifier);
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Mount* findMountForGuest(InodeIdentifier);
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HashMap<InodeIdentifier, Node*> m_inode2vnode;
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HashMap<dword, Node*> m_device2vnode;
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Vector<OwnPtr<Mount>> m_mounts;
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unsigned m_maxNodeCount { 0 };
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Node* m_nodes { nullptr };
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Vector<Node*> m_nodeFreeList;
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RetainPtr<Node> m_rootNode;
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HashMap<dword, CharacterDevice*> m_characterDevices;
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};
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