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641.2.2
by Monty Taylor
InnoDB Plugin 1.0.3 |
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/*****************************************************************************
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Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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641.1.2
by Monty Taylor
Imported 1.0.1 with clean - with no changes. |
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/******************************************************
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The B-tree
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Created 6/2/1994 Heikki Tuuri
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*******************************************************/
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#ifndef btr0btr_h
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#define btr0btr_h
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#include "univ.i" |
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#include "dict0dict.h" |
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#include "data0data.h" |
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#include "page0cur.h" |
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#include "mtr0mtr.h" |
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#include "btr0types.h" |
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/* Maximum record size which can be stored on a page, without using the
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special big record storage structure */
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#define BTR_PAGE_MAX_REC_SIZE (UNIV_PAGE_SIZE / 2 - 200)
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/* Maximum depth of a B-tree in InnoDB. Note that this isn't a maximum as
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such; none of the tree operations avoid producing trees bigger than this. It
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is instead a "max depth that other code must work with", useful for e.g.
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fixed-size arrays that must store some information about each level in a
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tree. In other words: if a B-tree with bigger depth than this is
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encountered, it is not acceptable for it to lead to mysterious memory
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corruption, but it is acceptable for the program to die with a clear assert
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failure. */
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#define BTR_MAX_LEVELS 100
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/* Latching modes for btr_cur_search_to_nth_level(). */
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#define BTR_SEARCH_LEAF RW_S_LATCH
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#define BTR_MODIFY_LEAF RW_X_LATCH
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#define BTR_NO_LATCHES RW_NO_LATCH
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#define BTR_MODIFY_TREE 33
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#define BTR_CONT_MODIFY_TREE 34
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#define BTR_SEARCH_PREV 35
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#define BTR_MODIFY_PREV 36
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/* If this is ORed to the latch mode, it means that the search tuple will be
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inserted to the index, at the searched position */
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#define BTR_INSERT 512
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/* This flag ORed to latch mode says that we do the search in query
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optimization */
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#define BTR_ESTIMATE 1024
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/* This flag ORed to latch mode says that we can ignore possible
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UNIQUE definition on secondary indexes when we decide if we can use the
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insert buffer to speed up inserts */
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#define BTR_IGNORE_SEC_UNIQUE 2048
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/******************************************************************
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Gets the root node of a tree and x-latches it. */
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UNIV_INTERN
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page_t* |
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btr_root_get( |
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/*=========*/
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/* out: root page, x-latched */
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dict_index_t* index, /* in: index tree */ |
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mtr_t* mtr); /* in: mtr */ |
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/******************************************************************
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Gets a buffer page and declares its latching order level. */
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UNIV_INLINE
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buf_block_t* |
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btr_block_get( |
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/*==========*/
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ulint space, /* in: space id */ |
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ulint zip_size, /* in: compressed page size in bytes |
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or 0 for uncompressed pages */
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ulint page_no, /* in: page number */ |
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ulint mode, /* in: latch mode */ |
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mtr_t* mtr); /* in: mtr */ |
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/******************************************************************
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Gets a buffer page and declares its latching order level. */
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UNIV_INLINE
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page_t* |
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btr_page_get( |
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/*=========*/
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ulint space, /* in: space id */ |
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ulint zip_size, /* in: compressed page size in bytes |
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or 0 for uncompressed pages */
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ulint page_no, /* in: page number */ |
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ulint mode, /* in: latch mode */ |
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mtr_t* mtr); /* in: mtr */ |
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/******************************************************************
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Gets the index id field of a page. */
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UNIV_INLINE
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dulint
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btr_page_get_index_id( |
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/*==================*/
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/* out: index id */
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const page_t* page); /* in: index page */ |
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/************************************************************
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Gets the node level field in an index page. */
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UNIV_INLINE
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ulint
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btr_page_get_level_low( |
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/*===================*/
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/* out: level, leaf level == 0 */
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const page_t* page); /* in: index page */ |
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/************************************************************
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Gets the node level field in an index page. */
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UNIV_INLINE
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ulint
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btr_page_get_level( |
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/*===============*/
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/* out: level, leaf level == 0 */
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const page_t* page, /* in: index page */ |
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mtr_t* mtr); /* in: mini-transaction handle */ |
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/************************************************************
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Gets the next index page number. */
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UNIV_INLINE
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ulint
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btr_page_get_next( |
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/*==============*/
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/* out: next page number */
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const page_t* page, /* in: index page */ |
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mtr_t* mtr); /* in: mini-transaction handle */ |
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/************************************************************
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Gets the previous index page number. */
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UNIV_INLINE
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ulint
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btr_page_get_prev( |
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/*==============*/
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/* out: prev page number */
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const page_t* page, /* in: index page */ |
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mtr_t* mtr); /* in: mini-transaction handle */ |
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/*****************************************************************
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Gets pointer to the previous user record in the tree. It is assumed
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that the caller has appropriate latches on the page and its neighbor. */
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UNIV_INTERN
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rec_t* |
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btr_get_prev_user_rec( |
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/*==================*/
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/* out: previous user record, NULL if there is none */
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rec_t* rec, /* in: record on leaf level */ |
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mtr_t* mtr); /* in: mtr holding a latch on the page, and if |
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needed, also to the previous page */
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/*****************************************************************
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Gets pointer to the next user record in the tree. It is assumed
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that the caller has appropriate latches on the page and its neighbor. */
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UNIV_INTERN
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rec_t* |
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btr_get_next_user_rec( |
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/*==================*/
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/* out: next user record, NULL if there is none */
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rec_t* rec, /* in: record on leaf level */ |
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mtr_t* mtr); /* in: mtr holding a latch on the page, and if |
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needed, also to the next page */
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/******************************************************************
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Releases the latch on a leaf page and bufferunfixes it. */
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UNIV_INLINE
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void
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btr_leaf_page_release( |
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/*==================*/
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buf_block_t* block, /* in: buffer block */ |
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ulint latch_mode, /* in: BTR_SEARCH_LEAF or |
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BTR_MODIFY_LEAF */
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mtr_t* mtr); /* in: mtr */ |
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/******************************************************************
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Gets the child node file address in a node pointer. */
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UNIV_INLINE
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ulint
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btr_node_ptr_get_child_page_no( |
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/*===========================*/
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/* out: child node address */
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const rec_t* rec, /* in: node pointer record */ |
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const ulint* offsets);/* in: array returned by rec_get_offsets() */ |
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/****************************************************************
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Creates the root node for a new index tree. */
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UNIV_INTERN
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ulint
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btr_create( |
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/*=======*/
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/* out: page number of the created root,
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FIL_NULL if did not succeed */
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ulint type, /* in: type of the index */ |
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ulint space, /* in: space where created */ |
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ulint zip_size,/* in: compressed page size in bytes |
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or 0 for uncompressed pages */
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dulint index_id,/* in: index id */ |
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dict_index_t* index, /* in: index */ |
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mtr_t* mtr); /* in: mini-transaction handle */ |
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/****************************************************************
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Frees a B-tree except the root page, which MUST be freed after this
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by calling btr_free_root. */
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UNIV_INTERN
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void
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btr_free_but_not_root( |
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/*==================*/
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ulint space, /* in: space where created */ |
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ulint zip_size, /* in: compressed page size in bytes |
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or 0 for uncompressed pages */
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ulint root_page_no); /* in: root page number */ |
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/****************************************************************
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Frees the B-tree root page. Other tree MUST already have been freed. */
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UNIV_INTERN
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void
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btr_free_root( |
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/*==========*/
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ulint space, /* in: space where created */ |
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ulint zip_size, /* in: compressed page size in bytes |
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or 0 for uncompressed pages */
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ulint root_page_no, /* in: root page number */ |
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mtr_t* mtr); /* in: a mini-transaction which has already |
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been started */
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/*****************************************************************
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Makes tree one level higher by splitting the root, and inserts
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the tuple. It is assumed that mtr contains an x-latch on the tree.
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NOTE that the operation of this function must always succeed,
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we cannot reverse it: therefore enough free disk space must be
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guaranteed to be available before this function is called. */
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UNIV_INTERN
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rec_t* |
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btr_root_raise_and_insert( |
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/*======================*/
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/* out: inserted record */
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btr_cur_t* cursor, /* in: cursor at which to insert: must be |
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on the root page; when the function returns,
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the cursor is positioned on the predecessor
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of the inserted record */
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const dtuple_t* tuple, /* in: tuple to insert */ |
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ulint n_ext, /* in: number of externally stored columns */ |
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mtr_t* mtr); /* in: mtr */ |
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/*****************************************************************
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Reorganizes an index page.
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IMPORTANT: if btr_page_reorganize() is invoked on a compressed leaf
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page of a non-clustered index, the caller must update the insert
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buffer free bits in the same mini-transaction in such a way that the
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modification will be redo-logged. */
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UNIV_INTERN
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ibool
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btr_page_reorganize( |
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/*================*/
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/* out: TRUE on success, FALSE on failure */
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buf_block_t* block, /* in: page to be reorganized */ |
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dict_index_t* index, /* in: record descriptor */ |
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mtr_t* mtr); /* in: mtr */ |
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/*****************************************************************
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Decides if the page should be split at the convergence point of
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inserts converging to left. */
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UNIV_INTERN
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ibool
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btr_page_get_split_rec_to_left( |
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/*===========================*/
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/* out: TRUE if split recommended */
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btr_cur_t* cursor, /* in: cursor at which to insert */ |
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rec_t** split_rec);/* out: if split recommended, |
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the first record on upper half page,
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or NULL if tuple should be first */
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/*****************************************************************
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Decides if the page should be split at the convergence point of
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inserts converging to right. */
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UNIV_INTERN
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ibool
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btr_page_get_split_rec_to_right( |
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/*============================*/
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/* out: TRUE if split recommended */
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btr_cur_t* cursor, /* in: cursor at which to insert */ |
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rec_t** split_rec);/* out: if split recommended, |
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the first record on upper half page,
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or NULL if tuple should be first */
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/*****************************************************************
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Splits an index page to halves and inserts the tuple. It is assumed
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that mtr holds an x-latch to the index tree. NOTE: the tree x-latch
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is released within this function! NOTE that the operation of this
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function must always succeed, we cannot reverse it: therefore
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enough free disk space must be guaranteed to be available before
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this function is called. */
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UNIV_INTERN
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rec_t* |
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btr_page_split_and_insert( |
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/*======================*/
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/* out: inserted record; NOTE: the tree
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x-latch is released! NOTE: 2 free disk
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pages must be available! */
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btr_cur_t* cursor, /* in: cursor at which to insert; when the |
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function returns, the cursor is positioned
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on the predecessor of the inserted record */
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const dtuple_t* tuple, /* in: tuple to insert */ |
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ulint n_ext, /* in: number of externally stored columns */ |
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mtr_t* mtr); /* in: mtr */ |
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/***********************************************************
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Inserts a data tuple to a tree on a non-leaf level. It is assumed
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that mtr holds an x-latch on the tree. */
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UNIV_INTERN
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void
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btr_insert_on_non_leaf_level( |
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/*=========================*/
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dict_index_t* index, /* in: index */ |
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ulint level, /* in: level, must be > 0 */ |
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dtuple_t* tuple, /* in: the record to be inserted */ |
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mtr_t* mtr); /* in: mtr */ |
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/********************************************************************
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Sets a record as the predefined minimum record. */
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UNIV_INTERN
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void
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btr_set_min_rec_mark( |
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/*=================*/
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rec_t* rec, /* in/out: record */ |
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mtr_t* mtr); /* in: mtr */ |
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/*****************************************************************
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Deletes on the upper level the node pointer to a page. */
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UNIV_INTERN
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void
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btr_node_ptr_delete( |
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328 |
/*================*/
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dict_index_t* index, /* in: index tree */ |
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buf_block_t* block, /* in: page whose node pointer is deleted */ |
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mtr_t* mtr); /* in: mtr */ |
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#ifdef UNIV_DEBUG
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/****************************************************************
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Checks that the node pointer to a page is appropriate. */
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UNIV_INTERN
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336 |
ibool
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btr_check_node_ptr( |
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338 |
/*===============*/
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/* out: TRUE */
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340 |
dict_index_t* index, /* in: index tree */ |
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341 |
buf_block_t* block, /* in: index page */ |
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mtr_t* mtr); /* in: mtr */ |
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#endif /* UNIV_DEBUG */ |
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344 |
/*****************************************************************
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Tries to merge the page first to the left immediate brother if such a
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brother exists, and the node pointers to the current page and to the
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brother reside on the same page. If the left brother does not satisfy these
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conditions, looks at the right brother. If the page is the only one on that
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level lifts the records of the page to the father page, thus reducing the
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tree height. It is assumed that mtr holds an x-latch on the tree and on the
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page. If cursor is on the leaf level, mtr must also hold x-latches to
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the brothers, if they exist. */
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UNIV_INTERN
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354 |
ibool
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355 |
btr_compress( |
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356 |
/*=========*/
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357 |
/* out: TRUE on success */
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358 |
btr_cur_t* cursor, /* in: cursor on the page to merge or lift; |
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359 |
the page must not be empty: in record delete
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360 |
use btr_discard_page if the page would become
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361 |
empty */
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362 |
mtr_t* mtr); /* in: mtr */ |
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363 |
/*****************************************************************
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364 |
Discards a page from a B-tree. This is used to remove the last record from
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365 |
a B-tree page: the whole page must be removed at the same time. This cannot
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366 |
be used for the root page, which is allowed to be empty. */
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367 |
UNIV_INTERN
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368 |
void
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369 |
btr_discard_page( |
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370 |
/*=============*/
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371 |
btr_cur_t* cursor, /* in: cursor on the page to discard: not on |
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372 |
the root page */
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373 |
mtr_t* mtr); /* in: mtr */ |
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374 |
/********************************************************************
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375 |
Parses the redo log record for setting an index record as the predefined
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376 |
minimum record. */
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377 |
UNIV_INTERN
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378 |
byte* |
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379 |
btr_parse_set_min_rec_mark( |
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380 |
/*=======================*/
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381 |
/* out: end of log record or NULL */
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382 |
byte* ptr, /* in: buffer */ |
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383 |
byte* end_ptr,/* in: buffer end */ |
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384 |
ulint comp, /* in: nonzero=compact page format */ |
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385 |
page_t* page, /* in: page or NULL */ |
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386 |
mtr_t* mtr); /* in: mtr or NULL */ |
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387 |
/***************************************************************
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388 |
Parses a redo log record of reorganizing a page. */
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389 |
UNIV_INTERN
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390 |
byte* |
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391 |
btr_parse_page_reorganize( |
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392 |
/*======================*/
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393 |
/* out: end of log record or NULL */
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394 |
byte* ptr, /* in: buffer */ |
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395 |
byte* end_ptr,/* in: buffer end */ |
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396 |
dict_index_t* index, /* in: record descriptor */ |
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397 |
buf_block_t* block, /* in: page to be reorganized, or NULL */ |
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398 |
mtr_t* mtr); /* in: mtr or NULL */ |
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399 |
/******************************************************************
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400 |
Gets the number of pages in a B-tree. */
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|
401 |
UNIV_INTERN
|
|
402 |
ulint
|
|
403 |
btr_get_size( |
|
404 |
/*=========*/
|
|
405 |
/* out: number of pages */
|
|
406 |
dict_index_t* index, /* in: index */ |
|
407 |
ulint flag); /* in: BTR_N_LEAF_PAGES or BTR_TOTAL_SIZE */ |
|
408 |
/******************************************************************
|
|
409 |
Allocates a new file page to be used in an index tree. NOTE: we assume
|
|
410 |
that the caller has made the reservation for free extents! */
|
|
411 |
UNIV_INTERN
|
|
412 |
buf_block_t* |
|
413 |
btr_page_alloc( |
|
414 |
/*===========*/
|
|
415 |
/* out: new allocated block, x-latched;
|
|
416 |
NULL if out of space */
|
|
417 |
dict_index_t* index, /* in: index tree */ |
|
418 |
ulint hint_page_no, /* in: hint of a good page */ |
|
419 |
byte file_direction, /* in: direction where a possible |
|
420 |
page split is made */
|
|
421 |
ulint level, /* in: level where the page is placed |
|
422 |
in the tree */
|
|
423 |
mtr_t* mtr); /* in: mtr */ |
|
424 |
/******************************************************************
|
|
425 |
Frees a file page used in an index tree. NOTE: cannot free field external
|
|
426 |
storage pages because the page must contain info on its level. */
|
|
427 |
UNIV_INTERN
|
|
428 |
void
|
|
429 |
btr_page_free( |
|
430 |
/*==========*/
|
|
431 |
dict_index_t* index, /* in: index tree */ |
|
432 |
buf_block_t* block, /* in: block to be freed, x-latched */ |
|
433 |
mtr_t* mtr); /* in: mtr */ |
|
434 |
/******************************************************************
|
|
435 |
Frees a file page used in an index tree. Can be used also to BLOB
|
|
436 |
external storage pages, because the page level 0 can be given as an
|
|
437 |
argument. */
|
|
438 |
UNIV_INTERN
|
|
439 |
void
|
|
440 |
btr_page_free_low( |
|
441 |
/*==============*/
|
|
442 |
dict_index_t* index, /* in: index tree */ |
|
443 |
buf_block_t* block, /* in: block to be freed, x-latched */ |
|
444 |
ulint level, /* in: page level */ |
|
445 |
mtr_t* mtr); /* in: mtr */ |
|
446 |
#ifdef UNIV_BTR_PRINT
|
|
447 |
/*****************************************************************
|
|
448 |
Prints size info of a B-tree. */
|
|
449 |
UNIV_INTERN
|
|
450 |
void
|
|
451 |
btr_print_size( |
|
452 |
/*===========*/
|
|
453 |
dict_index_t* index); /* in: index tree */ |
|
454 |
/******************************************************************
|
|
455 |
Prints directories and other info of all nodes in the index. */
|
|
456 |
UNIV_INTERN
|
|
457 |
void
|
|
458 |
btr_print_index( |
|
459 |
/*============*/
|
|
460 |
dict_index_t* index, /* in: index */ |
|
461 |
ulint width); /* in: print this many entries from start |
|
462 |
and end */
|
|
463 |
#endif /* UNIV_BTR_PRINT */ |
|
464 |
/****************************************************************
|
|
465 |
Checks the size and number of fields in a record based on the definition of
|
|
466 |
the index. */
|
|
467 |
UNIV_INTERN
|
|
468 |
ibool
|
|
469 |
btr_index_rec_validate( |
|
470 |
/*===================*/
|
|
471 |
/* out: TRUE if ok */
|
|
472 |
const rec_t* rec, /* in: index record */ |
|
473 |
const dict_index_t* index, /* in: index */ |
|
474 |
ibool dump_on_error); /* in: TRUE if the function |
|
475 |
should print hex dump of record
|
|
476 |
and page on error */
|
|
477 |
/******************************************************************
|
|
478 |
Checks the consistency of an index tree. */
|
|
479 |
UNIV_INTERN
|
|
480 |
ibool
|
|
481 |
btr_validate_index( |
|
482 |
/*===============*/
|
|
483 |
/* out: TRUE if ok */
|
|
484 |
dict_index_t* index, /* in: index */ |
|
485 |
trx_t* trx); /* in: transaction or NULL */ |
|
486 |
||
487 |
#define BTR_N_LEAF_PAGES 1
|
|
488 |
#define BTR_TOTAL_SIZE 2
|
|
489 |
||
490 |
#ifndef UNIV_NONINL
|
|
491 |
#include "btr0btr.ic" |
|
492 |
#endif
|
|
493 |
||
494 |
#endif
|