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/* Copyright (C) 2007 Michael Widenius
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 */
/*
Storage of records in block
*/
#define LSN_SIZE 7
#define DIR_COUNT_SIZE 1 /* Stores number of rows on page */
#define DIR_FREE_SIZE 1 /* Pointer to first free dir entry */
#define EMPTY_SPACE_SIZE 2 /* Stores empty space on page */
#define PAGE_TYPE_SIZE 1
#define PAGE_SUFFIX_SIZE 4 /* Bytes for checksum */
#define PAGE_HEADER_SIZE (LSN_SIZE + DIR_COUNT_SIZE + DIR_FREE_SIZE +\
EMPTY_SPACE_SIZE + PAGE_TYPE_SIZE)
#define PAGE_OVERHEAD_SIZE (PAGE_HEADER_SIZE + DIR_ENTRY_SIZE + \
PAGE_SUFFIX_SIZE)
#define BLOCK_RECORD_POINTER_SIZE 6
#define FULL_PAGE_SIZE(block_size) ((block_size) - LSN_SIZE - PAGE_TYPE_SIZE - \
PAGE_SUFFIX_SIZE)
#define ROW_EXTENT_PAGE_SIZE 5
#define ROW_EXTENT_COUNT_SIZE 2
#define ROW_EXTENT_SIZE (ROW_EXTENT_PAGE_SIZE + ROW_EXTENT_COUNT_SIZE)
#define TAIL_BIT 0x8000 /* Bit in page_count to signify tail */
/* Number of extents reserved MARIA_BITMAP_BLOCKS to store head part */
#define ELEMENTS_RESERVED_FOR_MAIN_PART 4
/* Fields before 'row->null_field_lengths' used by find_where_to_split_row */
#define EXTRA_LENGTH_FIELDS 3
/* Size for the different parts in the row header (and head page) */
#define FLAG_SIZE 1
#define TRANSID_SIZE 6
#define VERPTR_SIZE 7
#define DIR_ENTRY_SIZE 4
#define FIELD_OFFSET_SIZE 2 /* size of pointers to field starts */
/* Minimum header size needed for a new row */
#define BASE_ROW_HEADER_SIZE FLAG_SIZE
#define TRANS_ROW_EXTRA_HEADER_SIZE TRANSID_SIZE
#define PAGE_TYPE_MASK 7
enum en_page_type { UNALLOCATED_PAGE, HEAD_PAGE, TAIL_PAGE, BLOB_PAGE, MAX_PAGE_TYPE };
#define PAGE_TYPE_OFFSET LSN_SIZE
#define DIR_COUNT_OFFSET (LSN_SIZE+PAGE_TYPE_SIZE)
#define DIR_FREE_OFFSET (DIR_COUNT_OFFSET+DIR_COUNT_SIZE)
#define EMPTY_SPACE_OFFSET (DIR_FREE_OFFSET+DIR_FREE_SIZE)
#define PAGE_CAN_BE_COMPACTED 128 /* Bit in PAGE_TYPE */
/* Bits used for flag uchar (one byte, first in record) */
#define ROW_FLAG_TRANSID 1
#define ROW_FLAG_VER_PTR 2
#define ROW_FLAG_DELETE_TRANSID 4
#define ROW_FLAG_NULLS_EXTENDED 8
#define ROW_FLAG_EXTENTS 128
#define ROW_FLAG_ALL (1+2+4+8+128)
/******** Variables that affects how data pages are utilized ********/
/* Minium size of tail segment */
#define MIN_TAIL_SIZE 32
/*
Fixed length part of Max possible header size; See row data structure
table in ma_blockrec.c.
*/
#define MAX_FIXED_HEADER_SIZE (FLAG_SIZE + 3 + ROW_EXTENT_SIZE + 3)
#define TRANS_MAX_FIXED_HEADER_SIZE (MAX_FIXED_HEADER_SIZE + \
TRANSID_SIZE + VERPTR_SIZE + \
TRANSID_SIZE)
/* We use 1 uchar in record header to store number of directory entries */
#define MAX_ROWS_PER_PAGE 255
#define END_OF_DIR_FREE_LIST ((uchar) 255)
/* Bits for MARIA_BITMAP_BLOCKS->used */
/* We stored data on disk in the block */
#define BLOCKUSED_USED 1
/* Bitmap on disk is block->org_bitmap_value ; Happens only on update */
#define BLOCKUSED_USE_ORG_BITMAP 2
/* We stored tail data on disk for the block */
#define BLOCKUSED_TAIL 4
/******* defines that affects allocation (density) of data *******/
/*
If the tail part (from the main block or a blob) would use more than 75 % of
the size of page, store the tail on a full page instead of a shared
tail page.
*/
#define MAX_TAIL_SIZE(block_size) ((block_size) *3 / 4)
/* Don't allocate memory for too many row extents on the stack */
#define ROW_EXTENTS_ON_STACK 32
/* Functions to convert MARIA_RECORD_POS to/from page:offset */
static inline MARIA_RECORD_POS ma_recordpos(ulonglong page, uint dir_entry)
{
DBUG_ASSERT(dir_entry <= 255);
return (MARIA_RECORD_POS) ((page << 8) | dir_entry);
}
static inline my_off_t ma_recordpos_to_page(MARIA_RECORD_POS record_pos)
{
return record_pos >> 8;
}
static inline uint ma_recordpos_to_dir_entry(MARIA_RECORD_POS record_pos)
{
return (uint) (record_pos & 255);
}
static inline uchar *dir_entry_pos(uchar *buff, uint block_size, uint pos)
{
return (buff + block_size - DIR_ENTRY_SIZE * pos - PAGE_SUFFIX_SIZE -
DIR_ENTRY_SIZE);
}
/* ma_blockrec.c */
void _ma_init_block_record_data(void);
my_bool _ma_once_init_block_record(MARIA_SHARE *share, File dfile);
my_bool _ma_once_end_block_record(MARIA_SHARE *share);
my_bool _ma_init_block_record(MARIA_HA *info);
void _ma_end_block_record(MARIA_HA *info);
my_bool _ma_update_block_record(MARIA_HA *info, MARIA_RECORD_POS pos,
const uchar *oldrec, const uchar *newrec);
my_bool _ma_delete_block_record(MARIA_HA *info, const uchar *record);
int _ma_read_block_record(MARIA_HA *info, uchar *record,
MARIA_RECORD_POS record_pos);
int _ma_read_block_record2(MARIA_HA *info, uchar *record,
uchar *data, uchar *end_of_data);
int _ma_scan_block_record(MARIA_HA *info, uchar *record,
MARIA_RECORD_POS, my_bool);
my_bool _ma_cmp_block_unique(MARIA_HA *info, MARIA_UNIQUEDEF *def,
const uchar *record, MARIA_RECORD_POS pos);
my_bool _ma_scan_init_block_record(MARIA_HA *info);
void _ma_scan_end_block_record(MARIA_HA *info);
MARIA_RECORD_POS _ma_write_init_block_record(MARIA_HA *info,
const uchar *record);
my_bool _ma_write_block_record(MARIA_HA *info, const uchar *record);
my_bool _ma_write_abort_block_record(MARIA_HA *info);
my_bool _ma_compare_block_record(register MARIA_HA *info,
register const uchar *record);
/* ma_bitmap.c */
my_bool _ma_bitmap_init(MARIA_SHARE *share, File file);
my_bool _ma_bitmap_end(MARIA_SHARE *share);
my_bool _ma_flush_bitmap(MARIA_SHARE *share);
my_bool _ma_bitmap_find_place(MARIA_HA *info, MARIA_ROW *row,
MARIA_BITMAP_BLOCKS *result_blocks);
my_bool _ma_bitmap_release_unused(MARIA_HA *info, MARIA_BITMAP_BLOCKS *blocks);
my_bool _ma_bitmap_free_full_pages(MARIA_HA *info, const uchar *extents,
uint count);
my_bool _ma_bitmap_set(MARIA_HA *info, ulonglong pos, my_bool head,
uint empty_space);
my_bool _ma_reset_full_page_bits(MARIA_HA *info, MARIA_FILE_BITMAP *bitmap,
ulonglong page, uint page_count);
uint _ma_free_size_to_head_pattern(MARIA_FILE_BITMAP *bitmap, uint size);
my_bool _ma_bitmap_find_new_place(MARIA_HA *info, MARIA_ROW *new_row,
ulonglong page, uint free_size,
MARIA_BITMAP_BLOCKS *result_blocks);
my_bool _ma_check_bitmap_data(MARIA_HA *info,
enum en_page_type page_type, ulonglong page,
uint empty_space, uint *bitmap_pattern);
my_bool _ma_check_if_right_bitmap_type(MARIA_HA *info,
enum en_page_type page_type,
ulonglong page,
uint *bitmap_pattern);
void _ma_bitmap_delete_all(MARIA_SHARE *share);
int _ma_bitmap_create_first(MARIA_SHARE *share);
uint _ma_apply_redo_insert_row_head_or_tail(MARIA_HA *info, LSN lsn,
uint page_type,
const uchar *header,
const uchar *data,
size_t data_length);
uint _ma_apply_redo_purge_row_head_or_tail(MARIA_HA *info, LSN lsn,
uint page_type,
const uchar *header);
uint _ma_apply_redo_purge_blocks(MARIA_HA *info, LSN lsn,
const uchar *header);
my_bool _ma_apply_undo_row_insert(MARIA_HA *info, LSN undo_lsn,
const uchar *header);
my_bool _ma_apply_undo_row_delete(MARIA_HA *info, LSN undo_lsn,
const uchar *header, size_t length);
my_bool _ma_apply_undo_row_update(MARIA_HA *info, LSN undo_lsn,
const uchar *header, size_t length);
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