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#pragma once
#include "DiskBackedFileSystem.h"
#include "UnixTypes.h"
#include <AK/Buffer.h>
#include <AK/OwnPtr.h>
#include "ext2_fs.h"
struct ext2_group_desc;
struct ext2_inode;
struct ext2_super_block;
class Ext2FS;
class Ext2FSInode final : public Inode {
friend class Ext2FS;
public:
virtual ~Ext2FSInode() override;
size_t size() const { return m_raw_inode.i_size; }
bool is_symlink() const { return ::is_symlink(m_raw_inode.i_mode); }
// ^Inode (Retainable magic)
virtual void one_retain_left() override;
private:
// ^Inode
virtual ssize_t read_bytes(off_t, ssize_t, byte* buffer, FileDescriptor*) const override;
virtual InodeMetadata metadata() const override;
virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) const override;
virtual InodeIdentifier lookup(const String& name) override;
virtual String reverse_lookup(InodeIdentifier) override;
virtual void flush_metadata() override;
virtual ssize_t write_bytes(off_t, ssize_t, const byte* data, FileDescriptor*) override;
virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) override;
virtual KResult remove_child(const String& name) override;
virtual RetainPtr<Inode> parent() const override;
virtual int set_atime(time_t) override;
virtual int set_ctime(time_t) override;
virtual int set_mtime(time_t) override;
virtual int increment_link_count() override;
virtual int decrement_link_count() override;
virtual size_t directory_entry_count() const override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(uid_t, gid_t) override;
void populate_lookup_cache() const;
Ext2FS& fs();
const Ext2FS& fs() const;
Ext2FSInode(Ext2FS&, unsigned index);
mutable Vector<unsigned> m_block_list;
mutable HashMap<String, unsigned> m_lookup_cache;
ext2_inode m_raw_inode;
mutable InodeIdentifier m_parent_id;
};
class Ext2FS final : public DiskBackedFS {
friend class Ext2FSInode;
public:
static Retained <Ext2FS> create(Retained<DiskDevice>&&);
virtual ~Ext2FS() override;
virtual bool initialize() override;
virtual unsigned total_block_count() const override;
virtual unsigned free_block_count() const override;
virtual unsigned total_inode_count() const override;
virtual unsigned free_inode_count() const override;
private:
typedef unsigned BlockIndex;
typedef unsigned GroupIndex;
typedef unsigned InodeIndex;
explicit Ext2FS(Retained<DiskDevice>&&);
const ext2_super_block& super_block() const;
const ext2_group_desc& group_descriptor(unsigned groupIndex) const;
void flush_block_group_descriptor_table();
unsigned first_block_of_group(unsigned groupIndex) const;
unsigned inodes_per_block() const;
unsigned inodes_per_group() const;
unsigned blocks_per_group() const;
unsigned inode_size() const;
bool write_ext2_inode(unsigned, const ext2_inode&);
ByteBuffer read_block_containing_inode(unsigned inode, unsigned& block_index, unsigned& offset) const;
ByteBuffer read_super_block() const;
bool write_super_block(const ext2_super_block&);
virtual const char* class_name() const override;
virtual InodeIdentifier root_inode() const override;
virtual RetainPtr<Inode> create_inode(InodeIdentifier parentInode, const String& name, mode_t, unsigned size, int& error) override;
virtual RetainPtr<Inode> create_directory(InodeIdentifier parentInode, const String& name, mode_t, int& error) override;
virtual RetainPtr<Inode> get_inode(InodeIdentifier) const override;
unsigned allocate_inode(unsigned preferredGroup, unsigned expectedSize);
Vector<BlockIndex> allocate_blocks(unsigned group, unsigned count);
unsigned group_index_from_inode(unsigned) const;
GroupIndex group_index_from_block_index(BlockIndex) const;
Vector<unsigned> block_list_for_inode(const ext2_inode&, bool include_block_list_blocks = false) const;
bool write_block_list_for_inode(InodeIndex, ext2_inode&, const Vector<BlockIndex>&);
void dump_block_bitmap(unsigned groupIndex) const;
void dump_inode_bitmap(unsigned groupIndex) const;
template<typename F> void traverse_inode_bitmap(unsigned groupIndex, F) const;
template<typename F> void traverse_block_bitmap(unsigned groupIndex, F) const;
bool add_inode_to_directory(InodeIndex parent, InodeIndex child, const String& name, byte file_type, int& error);
bool write_directory_inode(unsigned directoryInode, Vector<DirectoryEntry>&&);
bool get_inode_allocation_state(InodeIndex) const;
bool set_inode_allocation_state(unsigned inode, bool);
bool set_block_allocation_state(BlockIndex, bool);
void uncache_inode(InodeIndex);
void free_inode(Ext2FSInode&);
struct BlockListShape {
unsigned direct_blocks { 0 };
unsigned indirect_blocks { 0 };
unsigned doubly_indirect_blocks { 0 };
unsigned triply_indirect_blocks { 0 };
unsigned meta_blocks { 0 };
};
BlockListShape compute_block_list_shape(unsigned blocks);
unsigned m_block_group_count { 0 };
mutable ByteBuffer m_cached_super_block;
mutable ByteBuffer m_cached_group_descriptor_table;
mutable HashMap<BlockIndex, RetainPtr<Ext2FSInode>> m_inode_cache;
};
inline Ext2FS& Ext2FSInode::fs()
{
return static_cast<Ext2FS&>(Inode::fs());
}
inline const Ext2FS& Ext2FSInode::fs() const
{
return static_cast<const Ext2FS&>(Inode::fs());
}
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