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