Import changeset

1 files changed, 155 insertions, 0 deletions

diff --git a/include/raid.h b/include/raid.h
new file mode 100644
index 00000000000..119f2b9b3b8
--- /dev/null
+++ b/include/raid.h
@@ -0,0 +1,155 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; 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 */
+
+extern const char *raid_type_string[];
+
+#if defined(USE_RAID)
+
+#ifdef __GNUC__
+#pragma interface			/* gcc class implementation */
+#endif
+#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)     my_raid_chsize(A,B,C)
+#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, myf MyFlags);
+  int my_raid_close(File, myf MyFlags);
+  int my_raid_fstat(int Filedes, struct stat *buf,  myf MyFlags);
+
+  const char *my_raid_type(int raid_type);
+
+#ifdef __cplusplus
+}
+
+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, 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 */