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/*
* Copyright (C) 2007-2011 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef MYRIAD_FS_H
#define MYRIAD_FS_H
#include "bu/myriad.h"
namespace Bu
{
class Stream;
subExceptionDecl( MyriadFsException );
/**
* A POSIX compliant, node based filesystem built on top of Myriad.
*
* Think about putting this all in one stream, on block boundaries.
*
* A header is placed into stream 1.
* Header format:
* int32_t iMagicHeader (A7188B39)
* int8_t iVersion (1)
* int32_t iNodeSize
* int32_t iNumNodes
* NodeLookup[iNumNodes] nNode
*
* Node lookup:
* int32_t iInode
* int32_t iPosition
*
* The node headers or inode structures have a base size of 22 bytes.
* Everything else in the block is used for the name. I.e. if you have
* a blocksize of 512 bytes then you wind up with a max name size of
* 512-22=490 characters, or a blocksize of 256 gives you 234 chraacters
* as a max. The node headers are all stored in stream 2.
* Basic node header format:
* int32_t iUser
* int32_t iGroup
* int16_t iPerms
* int16_t iLinks
* int32_t iStreamIndex
* int32_t iParentNode
* int64_t iATime
* int64_t iMTime
* int64_t iCTime
* int16_t iNameSize
* char[iNameSize] sName
*/
class MyriadFs
{
public:
MyriadFs( Bu::Stream &rStore, int iBlockSize=512 );
virtual ~MyriadFs();
enum
{
permOthX = 0000001,
permOthW = 0000002,
permOthR = 0000004,
permGrpX = 0000010,
permGrpW = 0000020,
permGrpR = 0000040,
permUsrX = 0000100,
permUsrW = 0000200,
permUsrR = 0000400,
permSticky = 0001000,
permSetGid = 0002000,
permSetUid = 0004000,
typeFifo = 0010000,
typeChrDev = 0020000,
typeDir = 0040000,
typeBlkDev = 0060000,
typeRegFile = 0100000,
typeSymLink = 0120000,
typeSocket = 0140000,
typeMask = 0170000
}
private:
Bu::Stream &rStore;
Bu::Myriad mStore;
};
};
#endif
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