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Diffstat (limited to 'src/mysql/raid.h')
| -rw-r--r-- | src/mysql/raid.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/src/mysql/raid.h b/src/mysql/raid.h new file mode 100644 index 000000000..519ba9e4d --- /dev/null +++ b/src/mysql/raid.h @@ -0,0 +1,159 @@ +/* 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 */
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