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