sortix--sortix/ext/inode.h

/*
 * Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * inode.h
 * Filesystem inode.
 */

#ifndef INODE_H
#define INODE_H

class Block;
class Filesystem;

class Inode
{
public:
	Inode(Filesystem* filesystem, uint32_t inode_id);
	~Inode();

public:
	Inode* prev_inode;
	Inode* next_inode;
	Inode* prev_hashed;
	Inode* next_hashed;
	Inode* prev_dirty;
	Inode* next_dirty;
	Block* data_block;
	struct ext_inode* data;
	Filesystem* filesystem;
	size_t reference_count;
	size_t remote_reference_count;
	uint32_t inode_id;
	bool dirty;

public:
	uint32_t Mode();
	uint32_t UserId();
	uint32_t GroupId();
	uint64_t Size();
	void SetMode(uint32_t mode);
	void SetUserId(uint32_t user);
	void SetGroupId(uint32_t group);
	void SetSize(uint64_t new_size);
	void Truncate(uint64_t new_size);
	bool FreeIndirect(uint64_t from, uint64_t offset, uint32_t block_id,
	                  int indirection, uint64_t entry_span);
	Block* GetBlock(uint64_t offset);
	Block* GetBlockFromTable(Block* table, uint32_t index);
	Inode* Open(const char* elem, int flags, mode_t mode);
	bool Link(const char* elem, Inode* dest, bool directories);
	bool Symlink(const char* elem, const char* dest);
	bool Unlink(const char* elem, bool directories, bool force=false);
	Inode* UnlinkKeep(const char* elem, bool directories, bool force=false);
	ssize_t ReadAt(uint8_t* buffer, size_t count, off_t offset);
	ssize_t WriteAt(const uint8_t* buffer, size_t count, off_t offset);
	bool UnembedInInode();
	bool Rename(Inode* olddir, const char* oldname, const char* newname);
	Inode* CreateDirectory(const char* path, mode_t mode);
	bool RemoveDirectory(const char* path);
	bool IsEmptyDirectory();
	void Refer();
	void Unref();
	void RemoteRefer();
	void RemoteUnref();
	void Sync();
	void BeginWrite();
	void FinishWrite();
	void Modified();
	void Use();
	void Unlink();
	void Prelink();
	void Delete();

};

#endif