mirror of
https://github.com/SerenityOS/serenity.git
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141 lines
4.2 KiB
C++
141 lines
4.2 KiB
C++
#pragma once
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#include "DiskDevice.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 "UnixTypes.h"
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#include <AK/ByteBuffer.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/Retainable.h>
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#include <AK/RetainPtr.h>
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#include <AK/String.h>
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#include <AK/Function.h>
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#include <AK/kstdio.h>
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static const dword mepoch = 476763780;
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class CoreInode;
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class FileDescriptor;
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class FileSystem : public Retainable<FileSystem> {
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public:
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static void initializeGlobals();
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virtual ~FileSystem();
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dword id() const { return m_id; }
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static FileSystem* fromID(dword);
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virtual bool initialize() = 0;
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virtual const char* className() const = 0;
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virtual InodeIdentifier rootInode() const = 0;
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virtual bool writeInode(InodeIdentifier, const ByteBuffer&) = 0;
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virtual InodeMetadata inodeMetadata(InodeIdentifier) const = 0;
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virtual Unix::ssize_t readInodeBytes(InodeIdentifier, Unix::off_t offset, Unix::size_t count, byte* buffer, FileDescriptor*) const = 0;
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struct DirectoryEntry {
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DirectoryEntry(const char* name, InodeIdentifier, byte fileType);
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DirectoryEntry(const char* name, Unix::size_t name_length, InodeIdentifier, byte fileType);
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char name[256];
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Unix::size_t name_length { 0 };
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InodeIdentifier inode;
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byte fileType { 0 };
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};
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virtual bool enumerateDirectoryInode(InodeIdentifier, Function<bool(const DirectoryEntry&)>) const = 0;
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virtual bool setModificationTime(InodeIdentifier, dword timestamp) = 0;
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virtual InodeIdentifier createInode(InodeIdentifier parentInode, const String& name, Unix::mode_t, unsigned size) = 0;
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virtual InodeIdentifier makeDirectory(InodeIdentifier parentInode, const String& name, Unix::mode_t) = 0;
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virtual InodeIdentifier find_parent_of_inode(InodeIdentifier) const = 0;
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virtual RetainPtr<CoreInode> get_inode(InodeIdentifier) const = 0;
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InodeIdentifier child_of_directory_inode_with_name(InodeIdentifier, const String& name) const;
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ByteBuffer readEntireInode(InodeIdentifier, FileDescriptor* = nullptr) const;
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String name_of_child_in_directory(InodeIdentifier parent, InodeIdentifier child) const;
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protected:
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FileSystem();
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private:
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dword m_id { 0 };
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};
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class CoreInode : public Retainable<CoreInode> {
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friend class VFS;
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public:
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virtual ~CoreInode();
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FileSystem& fs() { return m_fs; }
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const FileSystem& fs() const { return m_fs; }
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unsigned fsid() const;
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unsigned index() const { return m_index; }
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size_t size() const { return metadata().size; }
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bool is_symlink() const { return metadata().isSymbolicLink(); }
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bool is_directory() const { return metadata().isDirectory(); }
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InodeIdentifier identifier() const { return { fsid(), index() }; }
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const InodeMetadata& metadata() const { if (!m_metadata.isValid()) { populate_metadata(); } return m_metadata; }
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virtual Unix::ssize_t read_bytes(Unix::off_t, Unix::size_t, byte* buffer, FileDescriptor*) = 0;
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virtual bool traverse_as_directory(Function<bool(const FileSystem::DirectoryEntry&)>) = 0;
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ByteBuffer read_entire(FileDescriptor* = nullptr);
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protected:
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CoreInode(FileSystem& fs, unsigned index)
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: m_fs(fs)
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, m_index(index)
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{
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}
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virtual void populate_metadata() const = 0;
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mutable InodeMetadata m_metadata;
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private:
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FileSystem& m_fs;
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unsigned m_index { 0 };
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};
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inline FileSystem* InodeIdentifier::fileSystem()
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{
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return FileSystem::fromID(m_fileSystemID);
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}
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inline const FileSystem* InodeIdentifier::fileSystem() const
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{
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return FileSystem::fromID(m_fileSystemID);
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}
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inline InodeMetadata InodeIdentifier::metadata() const
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{
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if (!isValid())
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return InodeMetadata();
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return fileSystem()->inodeMetadata(*this);
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}
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inline bool InodeIdentifier::isRootInode() const
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{
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return (*this) == fileSystem()->rootInode();
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}
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inline unsigned CoreInode::fsid() const
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{
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return m_fs.id();
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}
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namespace AK {
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template<>
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struct Traits<InodeIdentifier> {
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// FIXME: This is a shitty hash.
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static unsigned hash(const InodeIdentifier& inode) { return Traits<unsigned>::hash(inode.fsid()) + Traits<unsigned>::hash(inode.index()); }
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static void dump(const InodeIdentifier& inode) { kprintf("%02u:%08u", inode.fsid(), inode.index()); }
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};
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}
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