raid.h
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:6k
- /* 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 USE_PRAGMA_INTERFACE
- #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 */