diff options
Diffstat (limited to 'storage/maria/ma_blockrec.h')
| -rw-r--r-- | storage/maria/ma_blockrec.h | 54 |
1 files changed, 35 insertions, 19 deletions
diff --git a/storage/maria/ma_blockrec.h b/storage/maria/ma_blockrec.h index 54145319b83..9e251a8c59d 100644 --- a/storage/maria/ma_blockrec.h +++ b/storage/maria/ma_blockrec.h @@ -18,11 +18,11 @@ */ #define LSN_SIZE 7 -#define DIRCOUNT_SIZE 1 /* Stores number of rows on page */ +#define DIR_COUNT_SIZE 1 /* Stores number of rows on page */ #define EMPTY_SPACE_SIZE 2 /* Stores empty space on page */ #define PAGE_TYPE_SIZE 1 #define PAGE_SUFFIX_SIZE 0 /* Bytes for page suffix */ -#define PAGE_HEADER_SIZE (LSN_SIZE + DIRCOUNT_SIZE + EMPTY_SPACE_SIZE +\ +#define PAGE_HEADER_SIZE (LSN_SIZE + DIR_COUNT_SIZE + EMPTY_SPACE_SIZE +\ PAGE_TYPE_SIZE) #define PAGE_OVERHEAD_SIZE (PAGE_HEADER_SIZE + DIR_ENTRY_SIZE + \ PAGE_SUFFIX_SIZE) @@ -34,14 +34,18 @@ #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 +#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 @@ -51,8 +55,8 @@ enum en_page_type { UNALLOCATED_PAGE, HEAD_PAGE, TAIL_PAGE, BLOB_PAGE, MAX_PAGE_TYPE }; #define PAGE_TYPE_OFFSET LSN_SIZE -#define DIR_ENTRY_OFFSET LSN_SIZE+PAGE_TYPE_SIZE -#define EMPTY_SPACE_OFFSET (DIR_ENTRY_OFFSET + DIRCOUNT_SIZE) +#define DIR_COUNT_OFFSET LSN_SIZE+PAGE_TYPE_SIZE +#define EMPTY_SPACE_OFFSET (DIR_COUNT_OFFSET + DIR_COUNT_SIZE) #define PAGE_CAN_BE_COMPACTED 128 /* Bit in PAGE_TYPE */ @@ -64,10 +68,15 @@ enum en_page_type { UNALLOCATED_PAGE, HEAD_PAGE, TAIL_PAGE, BLOB_PAGE, MAX_PAGE_ #define ROW_FLAG_EXTENTS 128 #define ROW_FLAG_ALL (1+2+4+8+128) -/* Variables that affects how data pages are utilized */ +/******** Variables that affects how data pages are utilized ********/ + +/* Minium size of tail segment */ #define MIN_TAIL_SIZE 32 -/* Fixed part of Max possible header size; See table in ma_blockrec.c */ +/* + 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 + \ @@ -77,21 +86,30 @@ enum en_page_type { UNALLOCATED_PAGE, HEAD_PAGE, TAIL_PAGE, BLOB_PAGE, MAX_PAGE_ #define MAX_ROWS_PER_PAGE 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 */ +/******* defines that affects allocation (density) of data *******/ -/* If we fill up a block to 75 %, don't create a new tail page for it */ +/* + If the tail part (from the main block or a blob) uses 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) +extern uchar maria_bitmap_marker[2]; + /* Functions to convert MARIA_RECORD_POS to/from page:offset */ -static inline MARIA_RECORD_POS ma_recordpos(ulonglong page, uint offset) +static inline MARIA_RECORD_POS ma_recordpos(ulonglong page, uint dir_entry) { - DBUG_ASSERT(offset <= 255); - return (MARIA_RECORD_POS) ((page << 8) | offset); + 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) @@ -99,17 +117,17 @@ static inline my_off_t ma_recordpos_to_page(MARIA_RECORD_POS record_pos) return record_pos >> 8; } -static inline my_off_t ma_recordpos_to_offset(MARIA_RECORD_POS record_pos) +static inline my_off_t ma_recordpos_to_dir_entry(MARIA_RECORD_POS record_pos) { return record_pos & 255; } /* ma_blockrec.c */ void _ma_init_block_record_data(void); -my_bool _ma_once_init_block_row(MARIA_SHARE *share, File dfile); -my_bool _ma_once_end_block_row(MARIA_SHARE *share); -my_bool _ma_init_block_row(MARIA_HA *info); -void _ma_end_block_row(MARIA_HA *info); +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 byte *record); @@ -136,8 +154,6 @@ my_bool _ma_compare_block_record(register MARIA_HA *info, 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_read_bitmap_page(MARIA_SHARE *share, MARIA_FILE_BITMAP *bitmap, - ulonglong page); 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); |