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