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/*****************************************************************************
Copyright (c) 1995, 2013, Oracle and/or its affiliates. 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.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/buf0types.h
The database buffer pool global types for the directory
Created 11/17/1995 Heikki Tuuri
*******************************************************/
#ifndef buf0types_h
#define buf0types_h
#if defined(INNODB_PAGE_ATOMIC_REF_COUNT) && defined(HAVE_ATOMIC_BUILTINS)
#define PAGE_ATOMIC_REF_COUNT
#endif /* INNODB_PAGE_ATOMIC_REF_COUNT && HAVE_ATOMIC_BUILTINS */
/** Buffer page (uncompressed or compressed) */
struct buf_page_t;
/** Buffer block for which an uncompressed page exists */
struct buf_block_t;
/** Buffer pool chunk comprising buf_block_t */
struct buf_chunk_t;
/** Buffer pool comprising buf_chunk_t */
struct buf_pool_t;
/** Buffer pool statistics struct */
struct buf_pool_stat_t;
/** Buffer pool buddy statistics struct */
struct buf_buddy_stat_t;
/** Doublewrite memory struct */
struct buf_dblwr_t;
/** A buffer frame. @see page_t */
typedef byte buf_frame_t;
/** Flags for flush types */
enum buf_flush_t {
BUF_FLUSH_LRU = 0, /*!< flush via the LRU list */
BUF_FLUSH_LIST, /*!< flush via the flush list
of dirty blocks */
BUF_FLUSH_SINGLE_PAGE, /*!< flush via the LRU list
but only a single page */
BUF_FLUSH_N_TYPES /*!< index of last element + 1 */
};
/** Algorithm to remove the pages for a tablespace from the buffer pool.
See buf_LRU_flush_or_remove_pages(). */
enum buf_remove_t {
BUF_REMOVE_ALL_NO_WRITE, /*!< Remove all pages from the buffer
pool, don't write or sync to disk */
BUF_REMOVE_FLUSH_NO_WRITE, /*!< Remove only, from the flush list,
don't write or sync to disk */
BUF_REMOVE_FLUSH_WRITE /*!< Flush dirty pages to disk only
don't remove from the buffer pool */
};
/** Flags for io_fix types */
enum buf_io_fix {
BUF_IO_NONE = 0, /**< no pending I/O */
BUF_IO_READ, /**< read pending */
BUF_IO_WRITE, /**< write pending */
BUF_IO_PIN /**< disallow relocation of
block and its removal of from
the flush_list */
};
/** Alternatives for srv_checksum_algorithm, which can be changed by
setting innodb_checksum_algorithm */
enum srv_checksum_algorithm_t {
SRV_CHECKSUM_ALGORITHM_CRC32, /*!< Write crc32, allow crc32,
innodb or none when reading */
SRV_CHECKSUM_ALGORITHM_STRICT_CRC32, /*!< Write crc32, allow crc32
when reading */
SRV_CHECKSUM_ALGORITHM_INNODB, /*!< Write innodb, allow crc32,
innodb or none when reading */
SRV_CHECKSUM_ALGORITHM_STRICT_INNODB, /*!< Write innodb, allow
innodb when reading */
SRV_CHECKSUM_ALGORITHM_NONE, /*!< Write none, allow crc32,
innodb or none when reading */
SRV_CHECKSUM_ALGORITHM_STRICT_NONE /*!< Write none, allow none
when reading */
};
/** Parameters of binary buddy system for compressed pages (buf0buddy.h) */
/* @{ */
/** Zip shift value for the smallest page size */
#define BUF_BUDDY_LOW_SHIFT UNIV_ZIP_SIZE_SHIFT_MIN
/** Smallest buddy page size */
#define BUF_BUDDY_LOW (1U << BUF_BUDDY_LOW_SHIFT)
/** Actual number of buddy sizes based on current page size */
#define BUF_BUDDY_SIZES (UNIV_PAGE_SIZE_SHIFT - BUF_BUDDY_LOW_SHIFT)
/** Maximum number of buddy sizes based on the max page size */
#define BUF_BUDDY_SIZES_MAX (UNIV_PAGE_SIZE_SHIFT_MAX \
- BUF_BUDDY_LOW_SHIFT)
/** twice the maximum block size of the buddy system;
the underlying memory is aligned by this amount:
this must be equal to UNIV_PAGE_SIZE */
#define BUF_BUDDY_HIGH (BUF_BUDDY_LOW << BUF_BUDDY_SIZES)
/* @} */
#endif /* buf0types.h */
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