/*****************************************************************************
Copyright (c) 2005, 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/page0zip.h
Compressed page interface
Created June 2005 by Marko Makela
*******************************************************/
#ifndef page0zip_h
#define page0zip_h
#ifdef UNIV_MATERIALIZE
# undef UNIV_INLINE
# define UNIV_INLINE
#endif
#include "mtr0types.h"
#include "page0types.h"
#include "buf0types.h"
#include "dict0types.h"
#include "trx0types.h"
#include "mem0mem.h"
/**********************************************************************//**
Determine the size of a compressed page in bytes.
@return size in bytes */
UNIV_INLINE
ulint
page_zip_get_size(
/*==============*/
const page_zip_des_t* page_zip) /*!< in: compressed page */
__attribute__((nonnull, pure));
/**********************************************************************//**
Set the size of a compressed page in bytes. */
UNIV_INLINE
void
page_zip_set_size(
/*==============*/
page_zip_des_t* page_zip, /*!< in/out: compressed page */
ulint size); /*!< in: size in bytes */
#ifndef UNIV_HOTBACKUP
/**********************************************************************//**
Determine if a record is so big that it needs to be stored externally.
@return FALSE if the entire record can be stored locally on the page */
UNIV_INLINE
ibool
page_zip_rec_needs_ext(
/*===================*/
ulint rec_size, /*!< in: length of the record in bytes */
ulint comp, /*!< in: nonzero=compact format */
ulint n_fields, /*!< in: number of fields in the record;
ignored if zip_size == 0 */
ulint zip_size) /*!< in: compressed page size in bytes, or 0 */
__attribute__((const));
/**********************************************************************//**
Determine the guaranteed free space on an empty page.
@return minimum payload size on the page */
UNIV_INTERN
ulint
page_zip_empty_size(
/*================*/
ulint n_fields, /*!< in: number of columns in the index */
ulint zip_size) /*!< in: compressed page size in bytes */
__attribute__((const));
#endif /* !UNIV_HOTBACKUP */
/**********************************************************************//**
Initialize a compressed page descriptor. */
UNIV_INLINE
void
page_zip_des_init(
/*==============*/
page_zip_des_t* page_zip); /*!< in/out: compressed page
descriptor */
/**********************************************************************//**
Configure the zlib allocator to use the given memory heap. */
UNIV_INTERN
void
page_zip_set_alloc(
/*===============*/
void* stream, /*!< in/out: zlib stream */
mem_heap_t* heap); /*!< in: memory heap to use */
/**********************************************************************//**
Compress a page.
@return TRUE on success, FALSE on failure; page_zip will be left
intact on failure. */
UNIV_INTERN
ibool
page_zip_compress(
/*==============*/
page_zip_des_t* page_zip,/*!< in: size; out: data, n_blobs,
m_start, m_end, m_nonempty */
const page_t* page, /*!< in: uncompressed page */
dict_index_t* index, /*!< in: index of the B-tree node */
mtr_t* mtr) /*!< in: mini-transaction, or NULL */
__attribute__((nonnull(1,2,3)));
/**********************************************************************//**
Decompress a page. This function should tolerate errors on the compressed
page. Instead of letting assertions fail, it will return FALSE if an
inconsistency is detected.
@return TRUE on success, FALSE on failure */
UNIV_INTERN
ibool
page_zip_decompress(
/*================*/
page_zip_des_t* page_zip,/*!< in: data, ssize;
out: m_start, m_end, m_nonempty, n_blobs */
page_t* page, /*!< out: uncompressed page, may be trashed */
ibool all) /*!< in: TRUE=decompress the whole page;
FALSE=verify but do not copy some
page header fields that should not change
after page creation */
__attribute__((nonnull(1,2)));
#ifdef UNIV_DEBUG
/**********************************************************************//**
Validate a compressed page descriptor.
@return TRUE if ok */
UNIV_INLINE
ibool
page_zip_simple_validate(
/*=====================*/
const page_zip_des_t* page_zip); /*!< in: compressed page
descriptor */
#endif /* UNIV_DEBUG */
#ifdef UNIV_ZIP_DEBUG
/**********************************************************************//**
Check that the compressed and decompressed pages match.
@return TRUE if valid, FALSE if not */
UNIV_INTERN
ibool
page_zip_validate_low(
/*==================*/
const page_zip_des_t* page_zip,/*!< in: compressed page */
const page_t* page, /*!< in: uncompressed page */
ibool sloppy) /*!< in: FALSE=strict,
TRUE=ignore the MIN_REC_FLAG */
__attribute__((nonnull));
/**********************************************************************//**
Check that the compressed and decompressed pages match. */
UNIV_INTERN
ibool
page_zip_validate(
/*==============*/
const page_zip_des_t* page_zip,/*!< in: compressed page */
const page_t* page) /*!< in: uncompressed page */
__attribute__((nonnull));
#endif /* UNIV_ZIP_DEBUG */
/**********************************************************************//**
Determine how big record can be inserted without recompressing the page.
@return a positive number indicating the maximum size of a record
whose insertion is guaranteed to succeed, or zero or negative */
UNIV_INLINE
lint
page_zip_max_ins_size(
/*==================*/
const page_zip_des_t* page_zip,/*!< in: compressed page */
ibool is_clust)/*!< in: TRUE if clustered index */
__attribute__((nonnull, pure));
/**********************************************************************//**
Determine if enough space is available in the modification log.
@return TRUE if page_zip_write_rec() will succeed */
UNIV_INLINE
ibool
page_zip_available(
/*===============*/
const page_zip_des_t* page_zip,/*!< in: compressed page */
ibool is_clust,/*!< in: TRUE if clustered index */
ulint length, /*!< in: combined size of the record */
ulint create) /*!< in: nonzero=add the record to
the heap */
__attribute__((nonnull, pure));
/**********************************************************************//**
Write data to the uncompressed header portion of a page. The data must
already have been written to the uncompressed page. */
UNIV_INLINE
void
page_zip_write_header(
/*==================*/
page_zip_des_t* page_zip,/*!< in/out: compressed page */
const byte* str, /*!< in: address on the uncompressed page */
ulint length, /*!< in: length of the data */
mtr_t* mtr) /*!< in: mini-transaction, or NULL */
__attribute__((nonnull(1,2)));
/**********************************************************************//**
Write an entire record on the compressed page. The data must already
have been written to the uncompressed page. */
UNIV_INTERN
void
page_zip_write_rec(
/*===============*/
page_zip_des_t* page_zip,/*!< in/out: compressed page */
const byte* rec, /*!< in: record being written */
dict_index_t* index, /*!< in: the index the record belongs to */
const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
ulint create) /*!< in: nonzero=insert, zero=update */
__attribute__((nonnull));
/***********************************************************//**
Parses a log record of writing a BLOB pointer of a record.
@return end of log record or NULL */
UNIV_INTERN
byte*
page_zip_parse_write_blob_ptr(
/*==========================*/
byte* ptr, /*!< in: redo log buffer */
byte* end_ptr,/*!< in: redo log buffer end */
page_t* page, /*!< in/out: uncompressed page */
page_zip_des_t* page_zip);/*!< in/out: compressed page */
/**********************************************************************//**
Write a BLOB pointer of a record on the leaf page of a clustered index.
The information must already have been updated on the uncompressed page. */
UNIV_INTERN
void
page_zip_write_blob_ptr(
/*====================*/
page_zip_des_t* page_zip,/*!< in/out: compressed page */
const byte* rec, /*!< in/out: record whose data is being
written */
dict_index_t* index, /*!< in: index of the page */
const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
ulint n, /*!< in: column index */
mtr_t* mtr) /*!< in: mini-transaction handle,
or NULL if no logging is needed */
__attribute__((nonnull(1,2,3,4)));
/***********************************************************//**
Parses a log record of writing the node pointer of a record.
@return end of log record or NULL */
UNIV_INTERN
byte*
page_zip_parse_write_node_ptr(
/*==========================*/
byte* ptr, /*!< in: redo log buffer */
byte* end_ptr,/*!< in: redo log buffer end */
page_t* page, /*!< in/out: uncompressed page */
page_zip_des_t* page_zip);/*!< in/out: compressed page */
/**********************************************************************//**
Write the node pointer of a record on a non-leaf compressed page. */
UNIV_INTERN
void
page_zip_write_node_ptr(
/*====================*/
page_zip_des_t* page_zip,/*!< in/out: compressed page */
byte* rec, /*!< in/out: record */
ulint size, /*!< in: data size of rec */
ulint ptr, /*!< in: node pointer */
mtr_t* mtr) /*!< in: mini-transaction, or NULL */
__attribute__((nonnull(1,2)));
/**********************************************************************//**
Write the trx_id and roll_ptr of a record on a B-tree leaf node page. */
UNIV_INTERN
void
page_zip_write_trx_id_and_roll_ptr(
/*===============================*/
page_zip_des_t* page_zip,/*!< in/out: compressed page */
byte* rec, /*!< in/out: record */
const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
ulint trx_id_col,/*!< in: column number of TRX_ID in rec */
trx_id_t trx_id, /*!< in: transaction identifier */
roll_ptr_t roll_ptr)/*!< in: roll_ptr */
__attribute__((nonnull));
/**********************************************************************//**
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));
/**********************************************************************//**
Insert a record to the dense page directory. */
UNIV_INTERN
void
page_zip_dir_insert(
/*================*/
page_zip_des_t* page_zip,/*!< in/out: compressed page */
const byte* prev_rec,/*!< in: record after which to insert */
const byte* free_rec,/*!< in: record from which rec was
allocated, or NULL */
byte* rec); /*!< in: record to insert */
/**********************************************************************//**
Shift the dense page directory and the array of BLOB pointers
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));
/***********************************************************//**
Parses a log record of writing to the header of a page.
@return end of log record or NULL */
UNIV_INTERN
byte*
page_zip_parse_write_header(
/*========================*/
byte* ptr, /*!< in: redo log buffer */
byte* end_ptr,/*!< in: redo log buffer end */
page_t* page, /*!< in/out: uncompressed page */
page_zip_des_t* page_zip);/*!< in/out: compressed page */
/**********************************************************************//**
Write data to the uncompressed header portion of a page. The data must
already have been written to the uncompressed page.
However, the data portion of the uncompressed page may differ from
the compressed page when a record is being inserted in
page_cur_insert_rec_low(). */
UNIV_INLINE
void
page_zip_write_header(
/*==================*/
page_zip_des_t* page_zip,/*!< in/out: compressed page */
const byte* str, /*!< in: address on the uncompressed page */
ulint length, /*!< in: length of the data */
mtr_t* mtr) /*!< in: mini-transaction, or NULL */
__attribute__((nonnull(1,2)));
/**********************************************************************//**
Reorganize and compress a page. This is a low-level operation for
compressed pages, to be used when page_zip_compress() fails.
On success, a redo log entry MLOG_ZIP_PAGE_COMPRESS will be written.
The function btr_page_reorganize() should be preferred whenever possible.
IMPORTANT: if page_zip_reorganize() is invoked on a leaf page of a
non-clustered index, the caller must update the insert buffer free
bits in the same mini-transaction in such a way that the modification
will be redo-logged.
@return TRUE on success, FALSE on failure; page_zip will be left
intact on failure, but page will be overwritten. */
UNIV_INTERN
ibool
page_zip_reorganize(
/*================*/
buf_block_t* block, /*!< in/out: page with compressed page;
on the compressed page, in: size;
out: data, n_blobs,
m_start, m_end, m_nonempty */
dict_index_t* index, /*!< in: index of the B-tree node */
mtr_t* mtr) /*!< in: mini-transaction */
__attribute__((nonnull));
#ifndef UNIV_HOTBACKUP
/**********************************************************************//**
Copy the records of a page byte for byte. Do not copy the page header
or trailer, except those B-tree header fields that are directly
related to the storage of records. Also copy PAGE_MAX_TRX_ID.
NOTE: The caller must update the lock table and the adaptive hash index. */
UNIV_INTERN
void
page_zip_copy_recs(
/*===============*/
page_zip_des_t* page_zip, /*!< out: copy of src_zip
(n_blobs, m_start, m_end,
m_nonempty, data[0..size-1]) */
page_t* page, /*!< out: copy of src */
const page_zip_des_t* src_zip, /*!< in: compressed page */
const page_t* src, /*!< in: page */
dict_index_t* index, /*!< in: index of the B-tree */
mtr_t* mtr) /*!< in: mini-transaction */
__attribute__((nonnull(1,2,3,4)));
#endif /* !UNIV_HOTBACKUP */
/**********************************************************************//**
Parses a log record of compressing an index page.
@return end of log record or NULL */
UNIV_INTERN
byte*
page_zip_parse_compress(
/*====================*/
byte* ptr, /*!< in: buffer */
byte* end_ptr,/*!< in: buffer end */
page_t* page, /*!< out: uncompressed page */
page_zip_des_t* page_zip)/*!< out: compressed page */
__attribute__((nonnull(1,2)));
/**********************************************************************//**
Calculate the compressed page checksum.
@return page checksum */
UNIV_INTERN
ulint
page_zip_calc_checksum(
/*===================*/
const void* data, /*!< in: compressed page */
ulint size) /*!< in: size of compressed page */
__attribute__((nonnull));
#ifndef UNIV_HOTBACKUP
/** Check if a pointer to an uncompressed page matches a compressed page.
@param ptr pointer to an uncompressed page frame
@param page_zip compressed page descriptor
@return TRUE if ptr and page_zip refer to the same block */
# define PAGE_ZIP_MATCH(ptr, page_zip) \
(buf_frame_get_page_zip(ptr) == (page_zip))
#else /* !UNIV_HOTBACKUP */
/** Check if a pointer to an uncompressed page matches a compressed page.
@param ptr pointer to an uncompressed page frame
@param page_zip compressed page descriptor
@return TRUE if ptr and page_zip refer to the same block */
# define PAGE_ZIP_MATCH(ptr, page_zip) \
(page_align(ptr) + UNIV_PAGE_SIZE == (page_zip)->data)
#endif /* !UNIV_HOTBACKUP */
#ifdef UNIV_MATERIALIZE
# undef UNIV_INLINE
# define UNIV_INLINE UNIV_INLINE_ORIGINAL
#endif
#ifndef UNIV_NONINL
# include "page0zip.ic"
#endif
#endif /* page0zip_h */