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#pragma once
#include "DiskDevice.h"
#include "InodeIdentifier.h"
#include "InodeMetadata.h"
#include "Limits.h"
#include "UnixTypes.h"
#include <AK/ByteBuffer.h>
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/Retainable.h>
#include <AK/RetainPtr.h>
#include <AK/String.h>
#include <AK/Function.h>
#include <AK/kstdio.h>
static const dword mepoch = 476763780;
class FileDescriptor;
class FileSystem : public Retainable<FileSystem> {
public:
static void initializeGlobals();
virtual ~FileSystem();
dword id() const { return m_id; }
static FileSystem* fromID(dword);
virtual bool initialize() = 0;
virtual const char* className() const = 0;
virtual InodeIdentifier rootInode() const = 0;
virtual bool writeInode(InodeIdentifier, const ByteBuffer&) = 0;
virtual InodeMetadata inodeMetadata(InodeIdentifier) const = 0;
virtual Unix::ssize_t readInodeBytes(InodeIdentifier, Unix::off_t offset, Unix::size_t count, byte* buffer, FileDescriptor*) const = 0;
struct DirectoryEntry {
String name;
InodeIdentifier inode;
byte fileType { 0 };
};
virtual bool enumerateDirectoryInode(InodeIdentifier, Function<bool(const DirectoryEntry&)>) const = 0;
virtual bool setModificationTime(InodeIdentifier, dword timestamp) = 0;
virtual InodeIdentifier createInode(InodeIdentifier parentInode, const String& name, Unix::mode_t, unsigned size) = 0;
virtual InodeIdentifier makeDirectory(InodeIdentifier parentInode, const String& name, Unix::mode_t) = 0;
virtual InodeIdentifier findParentOfInode(InodeIdentifier) const = 0;
InodeIdentifier childOfDirectoryInodeWithName(InodeIdentifier, const String& name) const;
ByteBuffer readEntireInode(InodeIdentifier, FileDescriptor* = nullptr) const;
String nameOfChildInDirectory(InodeIdentifier parent, InodeIdentifier child) const;
protected:
FileSystem();
private:
dword m_id { 0 };
};
inline FileSystem* InodeIdentifier::fileSystem()
{
return FileSystem::fromID(m_fileSystemID);
}
inline const FileSystem* InodeIdentifier::fileSystem() const
{
return FileSystem::fromID(m_fileSystemID);
}
inline InodeMetadata InodeIdentifier::metadata() const
{
if (!isValid())
return InodeMetadata();
return fileSystem()->inodeMetadata(*this);
}
inline bool InodeIdentifier::isRootInode() const
{
return (*this) == fileSystem()->rootInode();
}
namespace AK {
template<>
struct Traits<InodeIdentifier> {
// FIXME: This is a shitty hash.
static unsigned hash(const InodeIdentifier& inode) { return Traits<unsigned>::hash(inode.fileSystemID()) + Traits<unsigned>::hash(inode.index()); }
static void dump(const InodeIdentifier& inode) { kprintf("%02u:%08u", inode.fileSystemID(), inode.index()); }
};
}
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