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raid.h
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raid.h
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/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; 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 */
C_MODE_START
#define my_raid_type(raid_type) raid_type_string[(int)(raid_type)]
extern const char *raid_type_string[];
C_MODE_END
#ifdef DONT_USE_RAID
#undef USE_RAID
#endif
#if defined(USE_RAID)
#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,D) my_raid_chsize(A,B,C,D)
#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 __cplusplus
extern "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, int filler, myf MyFlags);
int my_raid_close(File, myf MyFlags);
int my_raid_fstat(int Filedes, struct stat *buf, myf MyFlags);
#ifdef __cplusplus
}
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
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, int filler, 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 */