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/*****************************************************************************
Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
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
*****************************************************************************/
/******************************************************************//**
@file include/fut0lst.ic
File-based list utilities
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_page(mtr, faddr, MTR_MEMO_PAGE_X_FIX));
ut_a(addr.page == FIL_NULL || addr.boffset >= FIL_PAGE_DATA);
ut_a(ut_align_offset(faddr, UNIV_PAGE_SIZE) >= FIL_PAGE_DATA);
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.
@return file address */
UNIV_INLINE
fil_addr_t
flst_read_addr(
/*===========*/
const 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);
ut_a(addr.page == FIL_NULL || addr.boffset >= FIL_PAGE_DATA);
ut_a(ut_align_offset(faddr, UNIV_PAGE_SIZE) >= FIL_PAGE_DATA);
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_page(mtr, 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.
@return length */
UNIV_INLINE
ulint
flst_get_len(
/*=========*/
const 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.
@return file address */
UNIV_INLINE
fil_addr_t
flst_get_first(
/*===========*/
const 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.
@return file address */
UNIV_INLINE
fil_addr_t
flst_get_last(
/*==========*/
const 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.
@return file address */
UNIV_INLINE
fil_addr_t
flst_get_next_addr(
/*===============*/
const 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.
@return file address */
UNIV_INLINE
fil_addr_t
flst_get_prev_addr(
/*===============*/
const 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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