mirror of
https://github.com/SerenityOS/serenity.git
synced 2025-01-23 18:02:05 -05:00
457a5df7d5
VirtualFileSystem -> VFS VirtualFileSystem::Node -> Vnode
141 lines
4.2 KiB
C++
141 lines
4.2 KiB
C++
#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 CoreInode;
|
|
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 {
|
|
DirectoryEntry(const char* name, InodeIdentifier, byte fileType);
|
|
DirectoryEntry(const char* name, Unix::size_t name_length, InodeIdentifier, byte fileType);
|
|
char name[256];
|
|
Unix::size_t name_length { 0 };
|
|
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;
|
|
|
|
virtual RetainPtr<CoreInode> get_inode(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 };
|
|
};
|
|
|
|
class CoreInode : public Retainable<CoreInode> {
|
|
friend class VFS;
|
|
public:
|
|
virtual ~CoreInode();
|
|
|
|
FileSystem& fs() { return m_fs; }
|
|
const FileSystem& fs() const { return m_fs; }
|
|
unsigned fsid() const;
|
|
unsigned index() const { return m_index; }
|
|
|
|
size_t size() const { return metadata().size; }
|
|
bool is_symlink() const { return metadata().isSymbolicLink(); }
|
|
bool is_directory() const { return metadata().isDirectory(); }
|
|
|
|
InodeIdentifier identifier() const { return { fsid(), index() }; }
|
|
const InodeMetadata& metadata() const { if (!m_metadata.isValid()) { populate_metadata(); } return m_metadata; }
|
|
|
|
virtual Unix::ssize_t read_bytes(Unix::off_t, Unix::size_t, byte* buffer, FileDescriptor*) = 0;
|
|
virtual bool traverse_as_directory(Function<bool(const FileSystem::DirectoryEntry&)>) = 0;
|
|
|
|
ByteBuffer read_entire(FileDescriptor* = nullptr);
|
|
|
|
protected:
|
|
CoreInode(FileSystem& fs, unsigned index)
|
|
: m_fs(fs)
|
|
, m_index(index)
|
|
{
|
|
}
|
|
|
|
virtual void populate_metadata() const = 0;
|
|
|
|
mutable InodeMetadata m_metadata;
|
|
private:
|
|
FileSystem& m_fs;
|
|
unsigned m_index { 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();
|
|
}
|
|
|
|
inline unsigned CoreInode::fsid() const
|
|
{
|
|
return m_fs.id();
|
|
}
|
|
|
|
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()); }
|
|
};
|
|
|
|
}
|
|
|