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/******************************************************
The B-tree
(c) 1994-1996 Innobase Oy
Created 6/2/1994 Heikki Tuuri
*******************************************************/
#include "mach0data.h"
#include "mtr0mtr.h"
#include "mtr0log.h"
#define BTR_MAX_NODE_LEVEL 50 /* used in debug checking */
/******************************************************************
Gets a buffer page and declares its latching order level. */
UNIV_INLINE
page_t*
btr_page_get(
/*=========*/
ulint space, /* in: space id */
ulint page_no, /* in: page number */
ulint mode, /* in: latch mode */
mtr_t* mtr) /* in: mtr */
{
page_t* page;
page = buf_page_get(space, page_no, mode, mtr);
#ifdef UNIV_SYNC_DEBUG
if (mode != RW_NO_LATCH) {
buf_page_dbg_add_level(page, SYNC_TREE_NODE);
}
#endif
return(page);
}
/******************************************************************
Sets the index id field of a page. */
UNIV_INLINE
void
btr_page_set_index_id(
/*==================*/
page_t* page, /* in: page to be created */
dulint id, /* in: index id */
mtr_t* mtr) /* in: mtr */
{
mlog_write_dulint(page + PAGE_HEADER + PAGE_INDEX_ID, id, mtr);
}
/******************************************************************
Gets the index id field of a page. */
UNIV_INLINE
dulint
btr_page_get_index_id(
/*==================*/
/* out: index id */
page_t* page) /* in: index page */
{
return(mach_read_from_8(page + PAGE_HEADER + PAGE_INDEX_ID));
}
/************************************************************
Gets the node level field in an index page. */
UNIV_INLINE
ulint
btr_page_get_level_low(
/*===================*/
/* out: level, leaf level == 0 */
page_t* page) /* in: index page */
{
ulint level;
ut_ad(page);
level = mach_read_from_2(page + PAGE_HEADER + PAGE_LEVEL);
ut_ad(level <= BTR_MAX_NODE_LEVEL);
return(level);
}
/************************************************************
Gets the node level field in an index page. */
UNIV_INLINE
ulint
btr_page_get_level(
/*===============*/
/* out: level, leaf level == 0 */
page_t* page, /* in: index page */
mtr_t* mtr __attribute__((unused))) /* in: mini-transaction handle */
{
ut_ad(page && mtr);
return(btr_page_get_level_low(page));
}
/************************************************************
Sets the node level field in an index page. */
UNIV_INLINE
void
btr_page_set_level(
/*===============*/
page_t* page, /* in: index page */
ulint level, /* in: level, leaf level == 0 */
mtr_t* mtr) /* in: mini-transaction handle */
{
ut_ad(page && mtr);
ut_ad(level <= BTR_MAX_NODE_LEVEL);
mlog_write_ulint(page + PAGE_HEADER + PAGE_LEVEL, level,
MLOG_2BYTES, mtr);
}
/************************************************************
Gets the next index page number. */
UNIV_INLINE
ulint
btr_page_get_next(
/*==============*/
/* out: next page number */
page_t* page, /* in: index page */
mtr_t* mtr __attribute__((unused))) /* in: mini-transaction handle */
{
ut_ad(page && mtr);
ut_ad(mtr_memo_contains(mtr, buf_block_align(page),
MTR_MEMO_PAGE_X_FIX)
|| mtr_memo_contains(mtr, buf_block_align(page),
MTR_MEMO_PAGE_S_FIX));
return(mach_read_from_4(page + FIL_PAGE_NEXT));
}
/************************************************************
Sets the next index page field. */
UNIV_INLINE
void
btr_page_set_next(
/*==============*/
page_t* page, /* in: index page */
ulint next, /* in: next page number */
mtr_t* mtr) /* in: mini-transaction handle */
{
ut_ad(page && mtr);
mlog_write_ulint(page + FIL_PAGE_NEXT, next, MLOG_4BYTES, mtr);
}
/************************************************************
Gets the previous index page number. */
UNIV_INLINE
ulint
btr_page_get_prev(
/*==============*/
/* out: prev page number */
page_t* page, /* in: index page */
mtr_t* mtr __attribute__((unused))) /* in: mini-transaction handle */
{
ut_ad(page && mtr);
return(mach_read_from_4(page + FIL_PAGE_PREV));
}
/************************************************************
Sets the previous index page field. */
UNIV_INLINE
void
btr_page_set_prev(
/*==============*/
page_t* page, /* in: index page */
ulint prev, /* in: previous page number */
mtr_t* mtr) /* in: mini-transaction handle */
{
ut_ad(page && mtr);
mlog_write_ulint(page + FIL_PAGE_PREV, prev, MLOG_4BYTES, mtr);
}
/******************************************************************
Gets the child node file address in a node pointer. */
UNIV_INLINE
ulint
btr_node_ptr_get_child_page_no(
/*===========================*/
/* out: child node address */
rec_t* rec, /* in: node pointer record */
const ulint* offsets)/* in: array returned by rec_get_offsets() */
{
byte* field;
ulint len;
ulint page_no;
ut_ad(!rec_offs_comp(offsets) || rec_get_node_ptr_flag(rec));
/* The child address is in the last field */
field = rec_get_nth_field(rec, offsets,
rec_offs_n_fields(offsets) - 1, &len);
ut_ad(len == 4);
page_no = mach_read_from_4(field);
if (page_no == 0) {
fprintf(stderr,
"InnoDB: a nonsensical page number 0 in a node ptr record at offset %lu\n",
(unsigned long)(rec - buf_frame_align(rec)));
buf_page_print(buf_frame_align(rec));
}
return(page_no);
}
/******************************************************************
Releases the latches on a leaf page and bufferunfixes it. */
UNIV_INLINE
void
btr_leaf_page_release(
/*==================*/
page_t* page, /* in: page */
ulint latch_mode, /* in: BTR_SEARCH_LEAF or BTR_MODIFY_LEAF */
mtr_t* mtr) /* in: mtr */
{
ut_ad(!mtr_memo_contains(mtr, buf_block_align(page),
MTR_MEMO_MODIFY));
if (latch_mode == BTR_SEARCH_LEAF) {
mtr_memo_release(mtr, buf_block_align(page),
MTR_MEMO_PAGE_S_FIX);
} else {
ut_ad(latch_mode == BTR_MODIFY_LEAF);
mtr_memo_release(mtr, buf_block_align(page),
MTR_MEMO_PAGE_X_FIX);
}
}
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