Annotation of win32/sql/mysql/include/raid.h, revision 1.1.1.1
1.1 parser 1: /* Copyright (C) 1999 Monty Program KB
2:
3: This software is distributed with NO WARRANTY OF ANY KIND. No author or
4: distributor accepts any responsibility for the consequences of using it, or
5: for whether it serves any particular purpose or works at all, unless he or
6: she says so in writing. Refer to the Free Public License (the "License")
7: for full details.
8:
9: Every copy of this file must include a copy of the License, normally in a
10: plain ASCII text file named PUBLIC. The License grants you the right to
11: copy, modify and redistribute this file, but only under certain conditions
12: described in the License. Among other things, the License requires that
13: the copyright notice and this notice be preserved on all copies. */
14:
15:
16: /* Parser needs these defines always, even if USE_RAID is not defined */
17: #define RAID_TYPE_0 1 // Striping
18: #define RAID_TYPE_x 2 // Some new modes
19: #define RAID_TYPE_y 3 //
20:
21: #define RAID_DEFAULT_CHUNKS 4
22: #define RAID_DEFAULT_CHUNKSIZE 256*1024 /* 256kB */
23:
24: extern const char *raid_type_string[];
25:
26: #if defined(USE_RAID)
27:
28: #ifdef __GNUC__
29: #pragma interface /* gcc class implementation */
30: #endif
31: #include "my_dir.h"
32:
33: /* Trap all occurences of my_...() in source and use our wrapper around this function */
34:
35: #ifdef MAP_TO_USE_RAID
36: #define my_read(A,B,C,D) my_raid_read(A,B,C,D)
37: #define my_write(A,B,C,D) my_raid_write(A,B,C,D)
38: #define my_pwrite(A,B,C,D,E) my_raid_pwrite(A,B,C,D,E)
39: #define my_pread(A,B,C,D,E) my_raid_pread(A,B,C,D,E)
40: #define my_chsize(A,B,C) my_raid_chsize(A,B,C)
41: #define my_close(A,B) my_raid_close(A,B)
42: #define my_tell(A,B) my_raid_tell(A,B)
43: #define my_seek(A,B,C,D) my_raid_seek(A,B,C,D)
44: #define my_lock(A,B,C,D,E) my_raid_lock(A,B,C,D,E)
45: #define my_fstat(A,B,C) my_raid_fstat(A,B,C)
46: #endif /* MAP_TO_USE_RAID */
47:
48: #ifdef __cplusplus
49: extern "C" {
50: #endif
51:
52: void init_raid(void);
53: void end_raid(void);
54:
55: bool is_raid(File fd);
56: File my_raid_create(const char *FileName, int CreateFlags, int access_flags,
57: uint raid_type, uint raid_chunks, ulong raid_chunksize,
58: myf MyFlags);
59: File my_raid_open(const char *FileName, int Flags,
60: uint raid_type, uint raid_chunks, ulong raid_chunksize,
61: myf MyFlags);
62: int my_raid_rename(const char *from, const char *to, uint raid_chunks,
63: myf MyFlags);
64: int my_raid_delete(const char *from, uint raid_chunks, myf MyFlags);
65: int my_raid_redel(const char *old_name, const char *new_name,
66: uint raid_chunks, myf MyFlags);
67:
68: my_off_t my_raid_seek(File fd, my_off_t pos, int whence, myf MyFlags);
69: my_off_t my_raid_tell(File fd, myf MyFlags);
70:
71: uint my_raid_write(File,const byte *Buffer, uint Count, myf MyFlags);
72: uint my_raid_read(File Filedes, byte *Buffer, uint Count, myf MyFlags);
73:
74: uint my_raid_pread(File Filedes, byte *Buffer, uint Count, my_off_t offset,
75: myf MyFlags);
76: uint my_raid_pwrite(int Filedes, const byte *Buffer, uint Count,
77: my_off_t offset, myf MyFlags);
78:
79: int my_raid_lock(File,int locktype, my_off_t start, my_off_t length,
80: myf MyFlags);
81: int my_raid_chsize(File fd, my_off_t newlength, myf MyFlags);
82: int my_raid_close(File, myf MyFlags);
83: int my_raid_fstat(int Filedes, struct stat *buf, myf MyFlags);
84:
85: const char *my_raid_type(int raid_type);
86:
87: #ifdef __cplusplus
88: }
89:
90: class RaidName {
91: public:
92: RaidName(const char *FileName);
93: ~RaidName();
94: bool IsRaid();
95: int Rename(const char * from, const char * to, myf MyFlags);
96: private:
97: uint _raid_type; // RAID_TYPE_0 or RAID_TYPE_1 or RAID_TYPE_5
98: uint _raid_chunks; // 1..n
99: ulong _raid_chunksize; // 1..n in bytes
100: };
101:
102: class RaidFd {
103: public:
104: RaidFd(uint raid_type, uint raid_chunks , ulong raid_chunksize);
105: ~RaidFd();
106: File Create(const char *FileName, int CreateFlags, int access_flags,
107: myf MyFlags);
108: File Open(const char *FileName, int Flags, myf MyFlags);
109: my_off_t Seek(my_off_t pos,int whence,myf MyFlags);
110: my_off_t Tell(myf MyFlags);
111: int Write(const byte *Buffer, uint Count, myf MyFlags);
112: int Read(const byte *Buffer, uint Count, myf MyFlags);
113: int Lock(int locktype, my_off_t start, my_off_t length, myf MyFlags);
114: int Chsize(File fd, my_off_t newlength, myf MyFlags);
115: int Fstat(int fd, MY_STAT *stat_area, myf MyFlags );
116: int Close(myf MyFlags);
117: static bool IsRaid(File fd);
118: static DYNAMIC_ARRAY _raid_map; /* Map of RaidFD* */
119: private:
120:
121: uint _raid_type; // RAID_TYPE_0 or RAID_TYPE_1 or RAID_TYPE_5
122: uint _raid_chunks; // 1..n
123: ulong _raid_chunksize; // 1..n in bytes
124:
125: ulong _total_block; // We are operating with block no x (can be 0..many).
126: uint _this_block; // can be 0.._raid_chunks
127: uint _remaining_bytes; // Maximum bytes that can be written in this block
128:
129: my_off_t _position;
130: my_off_t _size; // Cached file size for faster seek(SEEK_END)
131: File _fd;
132: File *_fd_vector; /* Array of File */
133: off_t *_seek_vector; /* Array of cached seek positions */
134:
135: inline void Calculate()
136: {
137: DBUG_ENTER("RaidFd::_Calculate");
138: DBUG_PRINT("info",("_position: %lu _raid_chunksize: %d, _size: %lu",
139: (ulong) _position, _raid_chunksize, (ulong) _size));
140:
141: _total_block = (ulong) (_position / _raid_chunksize);
142: _this_block = _total_block % _raid_chunks; // can be 0.._raid_chunks
143: _remaining_bytes = (uint) (_raid_chunksize -
144: (_position - _total_block * _raid_chunksize));
145: DBUG_PRINT("info",
146: ("_total_block: %d this_block: %d _remaining_bytes:%d",
147: _total_block, _this_block, _remaining_bytes));
148: DBUG_VOID_RETURN;
149: }
150: };
151:
152: #endif /* __cplusplus */
153: #endif /* USE_RAID */
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