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/**********************************************************************
File-based list utilities
(c) 1995 Innobase Oy
Created 11/28/1995 Heikki Tuuri
***********************************************************************/
#include "fut0fut.h"
#include "mtr0log.h"
#include "buf0buf.h"
/* We define the field offsets of a node for the list */
#define FLST_PREV 0 /* 6-byte address of the previous list element;
the page part of address is FIL_NULL, if no
previous element */
#define FLST_NEXT FIL_ADDR_SIZE /* 6-byte address of the next
list element; the page part of address
is FIL_NULL, if no next element */
/* We define the field offsets of a base node for the list */
#define FLST_LEN 0 /* 32-bit list length field */
#define FLST_FIRST 4 /* 6-byte address of the first element
of the list; undefined if empty list */
#define FLST_LAST (4 + FIL_ADDR_SIZE) /* 6-byte address of the
last element of the list; undefined
if empty list */
/************************************************************************
Writes a file address. */
UNIV_INLINE
void
flst_write_addr(
/*============*/
fil_faddr_t* faddr, /* in: pointer to file faddress */
fil_addr_t addr, /* in: file address */
mtr_t* mtr) /* in: mini-transaction handle */
{
ut_ad(faddr && mtr);
ut_ad(mtr_memo_contains(mtr, buf_block_align(faddr),
MTR_MEMO_PAGE_X_FIX));
mlog_write_ulint(faddr + FIL_ADDR_PAGE, addr.page, MLOG_4BYTES, mtr);
mlog_write_ulint(faddr + FIL_ADDR_BYTE, addr.boffset,
MLOG_2BYTES, mtr);
}
/************************************************************************
Reads a file address. */
UNIV_INLINE
fil_addr_t
flst_read_addr(
/*===========*/
/* out: file address */
fil_faddr_t* faddr, /* in: pointer to file faddress */
mtr_t* mtr) /* in: mini-transaction handle */
{
fil_addr_t addr;
ut_ad(faddr && mtr);
addr.page = mtr_read_ulint(faddr + FIL_ADDR_PAGE, MLOG_4BYTES, mtr);
addr.boffset = mtr_read_ulint(faddr + FIL_ADDR_BYTE, MLOG_2BYTES,
mtr);
return(addr);
}
/************************************************************************
Initializes a list base node. */
UNIV_INLINE
void
flst_init(
/*======*/
flst_base_node_t* base, /* in: pointer to base node */
mtr_t* mtr) /* in: mini-transaction handle */
{
ut_ad(mtr_memo_contains(mtr, buf_block_align(base),
MTR_MEMO_PAGE_X_FIX));
mlog_write_ulint(base + FLST_LEN, 0, MLOG_4BYTES, mtr);
flst_write_addr(base + FLST_FIRST, fil_addr_null, mtr);
flst_write_addr(base + FLST_LAST, fil_addr_null, mtr);
}
/************************************************************************
Gets list length. */
UNIV_INLINE
ulint
flst_get_len(
/*=========*/
/* out: length */
flst_base_node_t* base, /* in: pointer to base node */
mtr_t* mtr) /* in: mini-transaction handle */
{
return(mtr_read_ulint(base + FLST_LEN, MLOG_4BYTES, mtr));
}
/************************************************************************
Gets list first node address. */
UNIV_INLINE
fil_addr_t
flst_get_first(
/*===========*/
/* out: file address */
flst_base_node_t* base, /* in: pointer to base node */
mtr_t* mtr) /* in: mini-transaction handle */
{
return(flst_read_addr(base + FLST_FIRST, mtr));
}
/************************************************************************
Gets list last node address. */
UNIV_INLINE
fil_addr_t
flst_get_last(
/*==========*/
/* out: file address */
flst_base_node_t* base, /* in: pointer to base node */
mtr_t* mtr) /* in: mini-transaction handle */
{
return(flst_read_addr(base + FLST_LAST, mtr));
}
/************************************************************************
Gets list next node address. */
UNIV_INLINE
fil_addr_t
flst_get_next_addr(
/*===============*/
/* out: file address */
flst_node_t* node, /* in: pointer to node */
mtr_t* mtr) /* in: mini-transaction handle */
{
return(flst_read_addr(node + FLST_NEXT, mtr));
}
/************************************************************************
Gets list prev node address. */
UNIV_INLINE
fil_addr_t
flst_get_prev_addr(
/*===============*/
/* out: file address */
flst_node_t* node, /* in: pointer to node */
mtr_t* mtr) /* in: mini-transaction handle */
{
return(flst_read_addr(node + FLST_PREV, mtr));
}
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