Annotation of win32/sql/mysql/include/raid.h, revision 1.2
1.2 ! misha 1: /* Copyright (C) 2000 MySQL AB
1.1 parser 2:
1.2 ! misha 3: This program is free software; you can redistribute it and/or modify
! 4: it under the terms of the GNU General Public License as published by
! 5: the Free Software Foundation; version 2 of the License.
! 6:
! 7: This program is distributed in the hope that it will be useful,
! 8: but WITHOUT ANY WARRANTY; without even the implied warranty of
! 9: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 10: GNU General Public License for more details.
! 11:
! 12: You should have received a copy of the GNU General Public License
! 13: along with this program; if not, write to the Free Software
! 14: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
1.1 parser 15:
16: /* Parser needs these defines always, even if USE_RAID is not defined */
1.2 ! misha 17: #define RAID_TYPE_0 1 /* Striping */
! 18: #define RAID_TYPE_x 2 /* Some new modes */
! 19: #define RAID_TYPE_y 3
1.1 parser 20:
21: #define RAID_DEFAULT_CHUNKS 4
22: #define RAID_DEFAULT_CHUNKSIZE 256*1024 /* 256kB */
23:
1.2 ! misha 24: C_MODE_START
! 25: #define my_raid_type(raid_type) raid_type_string[(int)(raid_type)]
1.1 parser 26: extern const char *raid_type_string[];
1.2 ! misha 27: C_MODE_END
1.1 parser 28:
1.2 ! misha 29: #ifdef DONT_USE_RAID
! 30: #undef USE_RAID
! 31: #endif
1.1 parser 32: #if defined(USE_RAID)
33:
34: #include "my_dir.h"
35:
36: /* Trap all occurences of my_...() in source and use our wrapper around this function */
37:
38: #ifdef MAP_TO_USE_RAID
39: #define my_read(A,B,C,D) my_raid_read(A,B,C,D)
40: #define my_write(A,B,C,D) my_raid_write(A,B,C,D)
41: #define my_pwrite(A,B,C,D,E) my_raid_pwrite(A,B,C,D,E)
42: #define my_pread(A,B,C,D,E) my_raid_pread(A,B,C,D,E)
1.2 ! misha 43: #define my_chsize(A,B,C,D) my_raid_chsize(A,B,C,D)
1.1 parser 44: #define my_close(A,B) my_raid_close(A,B)
45: #define my_tell(A,B) my_raid_tell(A,B)
46: #define my_seek(A,B,C,D) my_raid_seek(A,B,C,D)
47: #define my_lock(A,B,C,D,E) my_raid_lock(A,B,C,D,E)
48: #define my_fstat(A,B,C) my_raid_fstat(A,B,C)
49: #endif /* MAP_TO_USE_RAID */
50:
51: #ifdef __cplusplus
52: extern "C" {
53: #endif
54:
55: void init_raid(void);
56: void end_raid(void);
57:
58: bool is_raid(File fd);
59: File my_raid_create(const char *FileName, int CreateFlags, int access_flags,
60: uint raid_type, uint raid_chunks, ulong raid_chunksize,
61: myf MyFlags);
62: File my_raid_open(const char *FileName, int Flags,
63: uint raid_type, uint raid_chunks, ulong raid_chunksize,
64: myf MyFlags);
65: int my_raid_rename(const char *from, const char *to, uint raid_chunks,
66: myf MyFlags);
67: int my_raid_delete(const char *from, uint raid_chunks, myf MyFlags);
68: int my_raid_redel(const char *old_name, const char *new_name,
69: uint raid_chunks, myf MyFlags);
70:
71: my_off_t my_raid_seek(File fd, my_off_t pos, int whence, myf MyFlags);
72: my_off_t my_raid_tell(File fd, myf MyFlags);
73:
74: uint my_raid_write(File,const byte *Buffer, uint Count, myf MyFlags);
75: uint my_raid_read(File Filedes, byte *Buffer, uint Count, myf MyFlags);
76:
77: uint my_raid_pread(File Filedes, byte *Buffer, uint Count, my_off_t offset,
78: myf MyFlags);
79: uint my_raid_pwrite(int Filedes, const byte *Buffer, uint Count,
80: my_off_t offset, myf MyFlags);
81:
82: int my_raid_lock(File,int locktype, my_off_t start, my_off_t length,
83: myf MyFlags);
1.2 ! misha 84: int my_raid_chsize(File fd, my_off_t newlength, int filler, myf MyFlags);
1.1 parser 85: int my_raid_close(File, myf MyFlags);
86: int my_raid_fstat(int Filedes, struct stat *buf, myf MyFlags);
87:
88: #ifdef __cplusplus
89: }
90:
1.2 ! misha 91: #ifdef USE_PRAGMA_INTERFACE
! 92: #pragma interface /* gcc class implementation */
! 93: #endif
! 94:
1.1 parser 95: class RaidName {
96: public:
97: RaidName(const char *FileName);
98: ~RaidName();
99: bool IsRaid();
100: int Rename(const char * from, const char * to, myf MyFlags);
101: private:
1.2 ! misha 102: uint _raid_type; /* RAID_TYPE_0 or RAID_TYPE_1 or RAID_TYPE_5 */
! 103: uint _raid_chunks; /* 1..n */
! 104: ulong _raid_chunksize; /* 1..n in bytes */
1.1 parser 105: };
106:
107: class RaidFd {
108: public:
109: RaidFd(uint raid_type, uint raid_chunks , ulong raid_chunksize);
110: ~RaidFd();
111: File Create(const char *FileName, int CreateFlags, int access_flags,
112: myf MyFlags);
113: File Open(const char *FileName, int Flags, myf MyFlags);
114: my_off_t Seek(my_off_t pos,int whence,myf MyFlags);
115: my_off_t Tell(myf MyFlags);
116: int Write(const byte *Buffer, uint Count, myf MyFlags);
117: int Read(const byte *Buffer, uint Count, myf MyFlags);
118: int Lock(int locktype, my_off_t start, my_off_t length, myf MyFlags);
1.2 ! misha 119: int Chsize(File fd, my_off_t newlength, int filler, myf MyFlags);
1.1 parser 120: int Fstat(int fd, MY_STAT *stat_area, myf MyFlags );
121: int Close(myf MyFlags);
122: static bool IsRaid(File fd);
123: static DYNAMIC_ARRAY _raid_map; /* Map of RaidFD* */
124: private:
125:
1.2 ! misha 126: uint _raid_type; /* RAID_TYPE_0 or RAID_TYPE_1 or RAID_TYPE_5 */
! 127: uint _raid_chunks; /* 1..n */
! 128: ulong _raid_chunksize; /* 1..n in bytes */
! 129:
! 130: ulong _total_block; /* We are operating with block no x (can be 0..many). */
! 131: uint _this_block; /* can be 0.._raid_chunks */
! 132: uint _remaining_bytes; /* Maximum bytes that can be written in this block */
1.1 parser 133:
134: my_off_t _position;
1.2 ! misha 135: my_off_t _size; /* Cached file size for faster seek(SEEK_END) */
1.1 parser 136: File _fd;
137: File *_fd_vector; /* Array of File */
138: off_t *_seek_vector; /* Array of cached seek positions */
139:
140: inline void Calculate()
141: {
142: DBUG_ENTER("RaidFd::_Calculate");
1.2 ! misha 143: DBUG_PRINT("info",("_position: %lu _raid_chunksize: %lu _size: %lu",
1.1 parser 144: (ulong) _position, _raid_chunksize, (ulong) _size));
145:
146: _total_block = (ulong) (_position / _raid_chunksize);
1.2 ! misha 147: _this_block = _total_block % _raid_chunks; /* can be 0.._raid_chunks */
1.1 parser 148: _remaining_bytes = (uint) (_raid_chunksize -
149: (_position - _total_block * _raid_chunksize));
150: DBUG_PRINT("info",
1.2 ! misha 151: ("_total_block: %lu this_block: %d _remaining_bytes: %d",
1.1 parser 152: _total_block, _this_block, _remaining_bytes));
153: DBUG_VOID_RETURN;
154: }
155: };
156:
157: #endif /* __cplusplus */
158: #endif /* USE_RAID */
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