/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB      This library is free software; you can redistribute it and/or   modify it under the terms of the GNU Library General Public   License as published by the Free Software Foundation; either   version 2 of the License, or (at your option) any later version.      This library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Library General Public License for more details.      You should have received a copy of the GNU Library General Public   License along with this library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,   MA 02111-1307, USA *//* Parser needs these defines  always, even if USE_RAID is not defined */#define RAID_TYPE_0 1       // Striping#define RAID_TYPE_x 2       // Some new modes#define RAID_TYPE_y 3       // #define RAID_DEFAULT_CHUNKS 4#define RAID_DEFAULT_CHUNKSIZE 256*1024 /* 256kB */extern const char *raid_type_string[];#if defined(USE_RAID)#ifdef __GNUC__#pragma interface			/* gcc class implementation */#endif#include "my_dir.h"/* Trap all occurences of my_...() in source and use our wrapper around this function */#ifdef MAP_TO_USE_RAID#define my_read(A,B,C,D)     my_raid_read(A,B,C,D)#define my_write(A,B,C,D)    my_raid_write(A,B,C,D)#define my_pwrite(A,B,C,D,E) my_raid_pwrite(A,B,C,D,E)#define my_pread(A,B,C,D,E)  my_raid_pread(A,B,C,D,E)#define my_chsize(A,B,C)     my_raid_chsize(A,B,C)#define my_close(A,B)        my_raid_close(A,B)#define my_tell(A,B)         my_raid_tell(A,B)#define my_seek(A,B,C,D)     my_raid_seek(A,B,C,D)#define my_lock(A,B,C,D,E)     my_raid_lock(A,B,C,D,E)#define my_fstat(A,B,C)     my_raid_fstat(A,B,C)#endif /* MAP_TO_USE_RAID */#ifdef __cplusplusextern "C" {#endif  void init_raid(void);  void end_raid(void);  bool is_raid(File fd);  File my_raid_create(const char *FileName, int CreateFlags, int access_flags,		      uint raid_type, uint raid_chunks, ulong raid_chunksize,		      myf MyFlags);  File my_raid_open(const char *FileName, int Flags,		    uint raid_type, uint raid_chunks, ulong raid_chunksize,		    myf MyFlags);  int my_raid_rename(const char *from, const char *to, uint raid_chunks,		     myf MyFlags);  int my_raid_delete(const char *from, uint raid_chunks, myf MyFlags);  int my_raid_redel(const char *old_name, const char *new_name,		    uint raid_chunks, myf MyFlags);  my_off_t my_raid_seek(File fd, my_off_t pos, int whence, myf MyFlags);  my_off_t my_raid_tell(File fd, myf MyFlags);  uint my_raid_write(File,const byte *Buffer, uint Count, myf MyFlags);  uint my_raid_read(File Filedes, byte *Buffer, uint Count, myf MyFlags);  uint my_raid_pread(File Filedes, byte *Buffer, uint Count, my_off_t offset,		     myf MyFlags);  uint my_raid_pwrite(int Filedes, const byte *Buffer, uint Count,		      my_off_t offset, myf MyFlags);  int my_raid_lock(File,int locktype, my_off_t start, my_off_t length,		   myf MyFlags);  int my_raid_chsize(File fd, my_off_t newlength, myf MyFlags);  int my_raid_close(File, myf MyFlags);  int my_raid_fstat(int Filedes, struct stat *buf,  myf MyFlags);  const char *my_raid_type(int raid_type);#ifdef __cplusplus}class RaidName {  public:    RaidName(const char *FileName);    ~RaidName();    bool IsRaid();    int Rename(const char * from, const char * to, myf MyFlags);  private:    uint _raid_type;       // RAID_TYPE_0 or RAID_TYPE_1 or RAID_TYPE_5    uint _raid_chunks;     // 1..n    ulong _raid_chunksize; // 1..n in bytes};class RaidFd {  public:    RaidFd(uint raid_type, uint raid_chunks , ulong raid_chunksize);    ~RaidFd();    File Create(const char *FileName, int CreateFlags, int access_flags,		myf MyFlags);    File Open(const char *FileName, int Flags, myf MyFlags);    my_off_t Seek(my_off_t pos,int whence,myf MyFlags);    my_off_t Tell(myf MyFlags);    int Write(const byte *Buffer, uint Count, myf MyFlags);    int Read(const byte *Buffer, uint Count, myf MyFlags);    int Lock(int locktype, my_off_t start, my_off_t length, myf MyFlags);    int Chsize(File fd, my_off_t newlength, myf MyFlags);    int Fstat(int fd, MY_STAT *stat_area, myf MyFlags );    int Close(myf MyFlags);    static bool IsRaid(File fd);    static DYNAMIC_ARRAY _raid_map;		/* Map of RaidFD* */  private:    uint _raid_type;       // RAID_TYPE_0 or RAID_TYPE_1 or RAID_TYPE_5    uint _raid_chunks;     // 1..n    ulong _raid_chunksize; // 1..n in bytes    ulong _total_block;    // We are operating with block no x (can be 0..many).    uint _this_block;      // can be 0.._raid_chunks    uint _remaining_bytes; // Maximum bytes that can be written in this block    my_off_t _position;    my_off_t _size;        // Cached file size for faster seek(SEEK_END)    File _fd;    File *_fd_vector;		/* Array of File */    off_t *_seek_vector;	/* Array of cached seek positions */    inline void Calculate()    {      DBUG_ENTER("RaidFd::_Calculate");      DBUG_PRINT("info",("_position: %lu _raid_chunksize: %d, _size: %lu",			 (ulong) _position, _raid_chunksize, (ulong) _size));      _total_block = (ulong) (_position / _raid_chunksize);      _this_block = _total_block % _raid_chunks;    // can be 0.._raid_chunks      _remaining_bytes = (uint) (_raid_chunksize -				 (_position - _total_block * _raid_chunksize));      DBUG_PRINT("info",		 ("_total_block: %d  this_block: %d  _remaining_bytes:%d",		  _total_block, _this_block, _remaining_bytes));      DBUG_VOID_RETURN;    }};#endif /* __cplusplus */#endif /* USE_RAID */