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150 lines
5.2 KiB
C
150 lines
5.2 KiB
C
/*****************************************************************************
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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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/**************************************************//**
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@file include/page0types.h
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Index page routines
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Created 2/2/1994 Heikki Tuuri
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*******************************************************/
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#ifndef page0types_h
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#define page0types_h
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#include "univ.i"
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#include "dict0types.h"
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#include "mtr0types.h"
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/** Eliminates a name collision on HP-UX */
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#define page_t ib_page_t
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/** Type of the index page */
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typedef byte page_t;
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/** Index page cursor */
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typedef struct page_cur_struct page_cur_t;
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/** Compressed index page */
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typedef byte page_zip_t;
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/** Compressed page descriptor */
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typedef struct page_zip_des_struct page_zip_des_t;
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/* The following definitions would better belong to page0zip.h,
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but we cannot include page0zip.h from rem0rec.ic, because
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page0*.h includes rem0rec.h and may include rem0rec.ic. */
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/** Number of bits needed for representing different compressed page sizes */
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#define PAGE_ZIP_SSIZE_BITS 3
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/** log2 of smallest compressed page size */
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#define PAGE_ZIP_MIN_SIZE_SHIFT 10
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/** Smallest compressed page size */
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#define PAGE_ZIP_MIN_SIZE (1 << PAGE_ZIP_MIN_SIZE_SHIFT)
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/** Number of supported compressed page sizes */
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#define PAGE_ZIP_NUM_SSIZE (UNIV_PAGE_SIZE_SHIFT - PAGE_ZIP_MIN_SIZE_SHIFT + 2)
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#if PAGE_ZIP_NUM_SSIZE > (1 << PAGE_ZIP_SSIZE_BITS)
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# error "PAGE_ZIP_NUM_SSIZE > (1 << PAGE_ZIP_SSIZE_BITS)"
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#endif
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/** Compressed page descriptor */
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struct page_zip_des_struct
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{
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page_zip_t* data; /*!< compressed page data */
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#ifdef UNIV_DEBUG
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unsigned m_start:16; /*!< start offset of modification log */
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#endif /* UNIV_DEBUG */
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unsigned m_end:16; /*!< end offset of modification log */
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unsigned m_nonempty:1; /*!< TRUE if the modification log
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is not empty */
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unsigned n_blobs:12; /*!< number of externally stored
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columns on the page; the maximum
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is 744 on a 16 KiB page */
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unsigned ssize:PAGE_ZIP_SSIZE_BITS;
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/*!< 0 or compressed page size;
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the size in bytes is
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PAGE_ZIP_MIN_SIZE << (ssize - 1). */
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};
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/** Compression statistics for a given page size */
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struct page_zip_stat_struct {
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/** Number of page compressions */
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ulint compressed;
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/** Number of successful page compressions */
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ulint compressed_ok;
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/** Number of page decompressions */
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ulint decompressed;
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/** Duration of page compressions in microseconds */
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ib_uint64_t compressed_usec;
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/** Duration of page decompressions in microseconds */
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ib_uint64_t decompressed_usec;
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};
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/** Compression statistics */
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typedef struct page_zip_stat_struct page_zip_stat_t;
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/** Statistics on compression, indexed by page_zip_des_struct::ssize - 1 */
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extern page_zip_stat_t page_zip_stat[PAGE_ZIP_NUM_SSIZE - 1];
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/**********************************************************************//**
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Write the "deleted" flag of a record on a compressed page. The flag must
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already have been written on the uncompressed page. */
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UNIV_INTERN
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void
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page_zip_rec_set_deleted(
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/*=====================*/
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page_zip_des_t* page_zip,/*!< in/out: compressed page */
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const byte* rec, /*!< in: record on the uncompressed page */
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ulint flag) /*!< in: the deleted flag (nonzero=TRUE) */
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__attribute__((nonnull));
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/**********************************************************************//**
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Write the "owned" flag of a record on a compressed page. The n_owned field
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must already have been written on the uncompressed page. */
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UNIV_INTERN
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void
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page_zip_rec_set_owned(
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/*===================*/
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page_zip_des_t* page_zip,/*!< in/out: compressed page */
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const byte* rec, /*!< in: record on the uncompressed page */
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ulint flag) /*!< in: the owned flag (nonzero=TRUE) */
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__attribute__((nonnull));
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/**********************************************************************//**
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Shift the dense page directory when a record is deleted. */
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UNIV_INTERN
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void
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page_zip_dir_delete(
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/*================*/
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page_zip_des_t* page_zip,/*!< in/out: compressed page */
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byte* rec, /*!< in: deleted record */
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dict_index_t* index, /*!< in: index of rec */
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const ulint* offsets,/*!< in: rec_get_offsets(rec) */
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const byte* free) /*!< in: previous start of the free list */
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__attribute__((nonnull(1,2,3,4)));
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/**********************************************************************//**
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Add a slot to the dense page directory. */
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UNIV_INTERN
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void
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page_zip_dir_add_slot(
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/*==================*/
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page_zip_des_t* page_zip, /*!< in/out: compressed page */
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ulint is_clustered) /*!< in: nonzero for clustered index,
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zero for others */
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__attribute__((nonnull));
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#endif
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