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/* Copyright (C) 2003 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; version 2 of the License.
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 */
#ifndef __NDB_DISKPAGE_HPP
#define __NDB_DISKPAGE_HPP
#include <ndb_types.h>
struct File_formats
{
STATIC_CONST( NDB_PAGE_SIZE = 32768 );
STATIC_CONST( NDB_PAGE_SIZE_WORDS = NDB_PAGE_SIZE >> 2);
enum File_type
{
FT_Datafile = 0x1,
FT_Undofile = 0x2
};
struct Page_header
{
Uint32 m_page_lsn_hi;
Uint32 m_page_lsn_lo;
Uint32 m_page_type;
};
enum Page_type
{
PT_Unallocated = 0x0,
PT_Extent_page = 0x1,
PT_Tup_fixsize_page = 0x2,
PT_Tup_varsize_page = 0x3,
PT_Undopage = 0x4
};
struct Zero_page_header
{
char m_magic[8];
Uint32 m_byte_order;
Uint32 m_page_size;
Uint32 m_ndb_version;
Uint32 m_node_id;
Uint32 m_file_type;
Uint32 m_time; // time(0)
void init(File_type ft, Uint32 node_id, Uint32 version, Uint32 now);
int validate(File_type ft, Uint32 node_id, Uint32 version, Uint32 now);
};
STATIC_CONST( NDB_PAGE_HEADER_WORDS = sizeof(Page_header) >> 2);
struct Datafile
{
struct Zero_page
{
struct Zero_page_header m_page_header;
Uint32 m_file_no; // Local_key
Uint32 m_file_id; // DICT id
Uint32 m_tablespace_id;
Uint32 m_tablespace_version;
Uint32 m_data_pages;
Uint32 m_extent_pages;
Uint32 m_extent_size;
Uint32 m_extent_count;
Uint32 m_extent_headers_per_page;
Uint32 m_extent_header_words;
Uint32 m_extent_header_bits_per_page;
};
struct Extent_header
{
Uint32 m_table;
union
{
Uint32 m_fragment_id;
Uint32 m_next_free_extent;
};
Uint32 m_page_bitmask[1]; // (BitsPerPage*ExtentSize)/(32*PageSize)
Uint32 get_free_bits(Uint32 page) const;
Uint32 get_free_word_offset(Uint32 page) const;
void update_free_bits(Uint32 page, Uint32 bit);
bool check_free(Uint32 extent_size) const ;
};
STATIC_CONST( EXTENT_HEADER_BITMASK_BITS_PER_PAGE = 4 );
STATIC_CONST( EXTENT_HEADER_FIXED_WORDS = (sizeof(Extent_header)>>2) - 1);
static Uint32 extent_header_words(Uint32 extent_size_in_pages);
struct Extent_page
{
struct Page_header m_page_header;
Extent_header m_extents[1];
Extent_header* get_header(Uint32 extent_no, Uint32 extent_size);
};
STATIC_CONST( EXTENT_PAGE_WORDS = NDB_PAGE_SIZE_WORDS - NDB_PAGE_HEADER_WORDS );
struct Data_page
{
struct Page_header m_page_header;
};
};
struct Undofile
{
struct Zero_page
{
struct Zero_page_header m_page_header;
Uint32 m_file_id;
Uint32 m_logfile_group_id;
Uint32 m_logfile_group_version;
Uint32 m_undo_pages;
};
struct Undo_page
{
struct Page_header m_page_header;
Uint32 m_words_used;
Uint32 m_data[1];
};
struct Undo_entry
{
Uint32 m_file_no;
Uint32 m_page_no;
struct
{
Uint32 m_len_offset;
Uint32 m_data[1];
} m_changes[1];
Uint32 m_length; // [ 16-bit type | 16 bit length of entry ]
};
enum Undo_type {
UNDO_LCP_FIRST = 1 // First LCP record with specific lcp id
,UNDO_LCP = 2 // LCP Start
/**
* TUP Undo record
*/
,UNDO_TUP_ALLOC = 3
,UNDO_TUP_UPDATE = 4
,UNDO_TUP_FREE = 5
,UNDO_TUP_CREATE = 6
,UNDO_TUP_DROP = 7
,UNDO_TUP_ALLOC_EXTENT = 8
,UNDO_TUP_FREE_EXTENT = 9
,UNDO_END = 0x7FFF
,UNDO_NEXT_LSN = 0x8000
};
struct Undo_lcp
{
Uint32 m_lcp_id;
Uint32 m_type_length; // 16 bit type, 16 bit length
};
};
STATIC_CONST( UNDO_PAGE_WORDS = NDB_PAGE_SIZE_WORDS - NDB_PAGE_HEADER_WORDS - 1);
};
/**
* Compute size of extent header in words
*/
inline Uint32
File_formats::Datafile::extent_header_words(Uint32 extent_size_in_pages)
{
return EXTENT_HEADER_FIXED_WORDS +
((extent_size_in_pages * EXTENT_HEADER_BITMASK_BITS_PER_PAGE + 31) >> 5);
}
inline
File_formats::Datafile::Extent_header*
File_formats::Datafile::Extent_page::get_header(Uint32 no, Uint32 extent_size)
{
Uint32 * tmp = (Uint32*)m_extents;
tmp += no*File_formats::Datafile::extent_header_words(extent_size);
return (Extent_header*)tmp;
}
inline
Uint32
File_formats::Datafile::Extent_header::get_free_bits(Uint32 page) const
{
return ((m_page_bitmask[page >> 3] >> ((page & 7) << 2))) & 15;
}
inline
Uint32
File_formats::Datafile::Extent_header::get_free_word_offset(Uint32 page) const
{
return page >> 3;
}
inline
void
File_formats::Datafile::Extent_header::update_free_bits(Uint32 page,
Uint32 bit)
{
Uint32 shift = (page & 7) << 2;
Uint32 mask = (15 << shift);
Uint32 org = m_page_bitmask[page >> 3];
m_page_bitmask[page >> 3] = (org & ~mask) | (bit << shift);
}
inline
bool
File_formats::Datafile::Extent_header::check_free(Uint32 extent_size) const
{
Uint32 words = (extent_size * EXTENT_HEADER_BITMASK_BITS_PER_PAGE + 31) >> 5;
Uint32 sum = 0;
for(; words; words--)
sum |= m_page_bitmask[words-1];
if(sum & 0x3333)
return false;
return true;
}
#include <NdbOut.hpp>
NdbOut& operator<<(NdbOut& out, const File_formats::Zero_page_header&);
NdbOut& operator<<(NdbOut& out, const File_formats::Datafile::Zero_page&);
NdbOut& operator<<(NdbOut& out, const File_formats::Undofile::Zero_page&);
#endif
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