/*****************************************************************************

Copyright (c) 1995, 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/mtr0mtr.h
Mini-transaction buffer

Created 11/26/1995 Heikki Tuuri
*******************************************************/

#ifndef mtr0mtr_h
#define mtr0mtr_h

#include "univ.i"
#include "mem0mem.h"
#include "dyn0dyn.h"
#include "buf0types.h"
#include "sync0rw.h"
#include "ut0byte.h"
#include "mtr0types.h"
#include "page0types.h"

/* Logging modes for a mini-transaction */
#define MTR_LOG_ALL		21	/* default mode: log all operations
					modifying disk-based data */
#define	MTR_LOG_NONE		22	/* log no operations */
/*#define	MTR_LOG_SPACE	23 */	/* log only operations modifying
					file space page allocation data
					(operations in fsp0fsp.* ) */
#define	MTR_LOG_SHORT_INSERTS	24	/* inserts are logged in a shorter
					form */

/* Types for the mlock objects to store in the mtr memo; NOTE that the
first 3 values must be RW_S_LATCH, RW_X_LATCH, RW_NO_LATCH */
#define	MTR_MEMO_PAGE_S_FIX	RW_S_LATCH
#define	MTR_MEMO_PAGE_X_FIX	RW_X_LATCH
#define	MTR_MEMO_BUF_FIX	RW_NO_LATCH
#define MTR_MEMO_MODIFY		54
#define	MTR_MEMO_S_LOCK		55
#define	MTR_MEMO_X_LOCK		56

/** @name Log item types
The log items are declared 'byte' so that the compiler can warn if val
and type parameters are switched in a call to mlog_write_ulint. NOTE!
For 1 - 8 bytes, the flag value must give the length also! @{ */
#define	MLOG_SINGLE_REC_FLAG	128		/*!< if the mtr contains only
						one log record for one page,
						i.e., write_initial_log_record
						has been called only once,
						this flag is ORed to the type
						of that first log record */
#define	MLOG_1BYTE		(1)		/*!< one byte is written */
#define	MLOG_2BYTES		(2)		/*!< 2 bytes ... */
#define	MLOG_4BYTES		(4)		/*!< 4 bytes ... */
#define	MLOG_8BYTES		(8)		/*!< 8 bytes ... */
#define	MLOG_REC_INSERT		((byte)9)	/*!< record insert */
#define	MLOG_REC_CLUST_DELETE_MARK ((byte)10)	/*!< mark clustered index record
						deleted */
#define	MLOG_REC_SEC_DELETE_MARK ((byte)11)	/*!< mark secondary index record
						deleted */
#define MLOG_REC_UPDATE_IN_PLACE ((byte)13)	/*!< update of a record,
						preserves record field sizes */
#define MLOG_REC_DELETE		((byte)14)	/*!< delete a record from a
						page */
#define	MLOG_LIST_END_DELETE	((byte)15)	/*!< delete record list end on
						index page */
#define	MLOG_LIST_START_DELETE	((byte)16)	/*!< delete record list start on
						index page */
#define	MLOG_LIST_END_COPY_CREATED ((byte)17)	/*!< copy record list end to a
						new created index page */
#define	MLOG_PAGE_REORGANIZE	((byte)18)	/*!< reorganize an
						index page in
						ROW_FORMAT=REDUNDANT */
#define MLOG_PAGE_CREATE	((byte)19)	/*!< create an index page */
#define	MLOG_UNDO_INSERT	((byte)20)	/*!< insert entry in an undo
						log */
#define MLOG_UNDO_ERASE_END	((byte)21)	/*!< erase an undo log
						page end */
#define	MLOG_UNDO_INIT		((byte)22)	/*!< initialize a page in an
						undo log */
#define MLOG_UNDO_HDR_DISCARD	((byte)23)	/*!< discard an update undo log
						header */
#define	MLOG_UNDO_HDR_REUSE	((byte)24)	/*!< reuse an insert undo log
						header */
#define MLOG_UNDO_HDR_CREATE	((byte)25)	/*!< create an undo
						log header */
#define MLOG_REC_MIN_MARK	((byte)26)	/*!< mark an index
						record as the
						predefined minimum
						record */
#define MLOG_IBUF_BITMAP_INIT	((byte)27)	/*!< initialize an
						ibuf bitmap page */
/*#define	MLOG_FULL_PAGE	((byte)28)	full contents of a page */
#ifdef UNIV_LOG_LSN_DEBUG
# define MLOG_LSN		((byte)28)	/* current LSN */
#endif
#define MLOG_INIT_FILE_PAGE	((byte)29)	/*!< this means that a
						file page is taken
						into use and the prior
						contents of the page
						should be ignored: in
						recovery we must not
						trust the lsn values
						stored to the file
						page */
#define MLOG_WRITE_STRING	((byte)30)	/*!< write a string to
						a page */
#define	MLOG_MULTI_REC_END	((byte)31)	/*!< if a single mtr writes
						several log records,
						this log record ends the
						sequence of these records */
#define MLOG_DUMMY_RECORD	((byte)32)	/*!< dummy log record used to
						pad a log block full */
#define MLOG_FILE_CREATE	((byte)33)	/*!< log record about an .ibd
						file creation */
#define MLOG_FILE_RENAME	((byte)34)	/*!< log record about an .ibd
						file rename */
#define MLOG_FILE_DELETE	((byte)35)	/*!< log record about an .ibd
						file deletion */
#define MLOG_COMP_REC_MIN_MARK	((byte)36)	/*!< mark a compact
						index record as the
						predefined minimum
						record */
#define MLOG_COMP_PAGE_CREATE	((byte)37)	/*!< create a compact
						index page */
#define MLOG_COMP_REC_INSERT	((byte)38)	/*!< compact record insert */
#define MLOG_COMP_REC_CLUST_DELETE_MARK ((byte)39)
						/*!< mark compact
						clustered index record
						deleted */
#define MLOG_COMP_REC_SEC_DELETE_MARK ((byte)40)/*!< mark compact
						secondary index record
						deleted; this log
						record type is
						redundant, as
						MLOG_REC_SEC_DELETE_MARK
						is independent of the
						record format. */
#define MLOG_COMP_REC_UPDATE_IN_PLACE ((byte)41)/*!< update of a
						compact record,
						preserves record field
						sizes */
#define MLOG_COMP_REC_DELETE	((byte)42)	/*!< delete a compact record
						from a page */
#define MLOG_COMP_LIST_END_DELETE ((byte)43)	/*!< delete compact record list
						end on index page */
#define MLOG_COMP_LIST_START_DELETE ((byte)44)	/*!< delete compact record list
						start on index page */
#define MLOG_COMP_LIST_END_COPY_CREATED ((byte)45)
						/*!< copy compact
						record list end to a
						new created index
						page */
#define MLOG_COMP_PAGE_REORGANIZE ((byte)46)	/*!< reorganize an index page */
#define MLOG_FILE_CREATE2	((byte)47)	/*!< log record about creating
						an .ibd file, with format */
#define MLOG_ZIP_WRITE_NODE_PTR	((byte)48)	/*!< write the node pointer of
						a record on a compressed
						non-leaf B-tree page */
#define MLOG_ZIP_WRITE_BLOB_PTR	((byte)49)	/*!< write the BLOB pointer
						of an externally stored column
						on a compressed page */
#define MLOG_ZIP_WRITE_HEADER	((byte)50)	/*!< write to compressed page
						header */
#define MLOG_ZIP_PAGE_COMPRESS	((byte)51)	/*!< compress an index page */
#define MLOG_BIGGEST_TYPE	((byte)51)	/*!< biggest value (used in
						assertions) */
/* @} */

/** @name Flags for MLOG_FILE operations
(stored in the page number parameter, called log_flags in the
functions).  The page number parameter was originally written as 0. @{ */
#define MLOG_FILE_FLAG_TEMP	1	/*!< identifies TEMPORARY TABLE in
					MLOG_FILE_CREATE, MLOG_FILE_CREATE2 */
/* @} */

/***************************************************************//**
Starts a mini-transaction and creates a mini-transaction handle
and buffer in the memory buffer given by the caller.
@return	mtr buffer which also acts as the mtr handle */
UNIV_INLINE
mtr_t*
mtr_start(
/*======*/
	mtr_t*	mtr);	/*!< in: memory buffer for the mtr buffer */
/***************************************************************//**
Commits a mini-transaction. */
UNIV_INTERN
void
mtr_commit(
/*=======*/
	mtr_t*	mtr);	/*!< in: mini-transaction */
/**********************************************************//**
Sets and returns a savepoint in mtr.
@return	savepoint */
UNIV_INLINE
ulint
mtr_set_savepoint(
/*==============*/
	mtr_t*	mtr);	/*!< in: mtr */
/**********************************************************//**
Releases the latches stored in an mtr memo down to a savepoint.
NOTE! The mtr must not have made changes to buffer pages after the
savepoint, as these can be handled only by mtr_commit. */
UNIV_INTERN
void
mtr_rollback_to_savepoint(
/*======================*/
	mtr_t*	mtr,		/*!< in: mtr */
	ulint	savepoint);	/*!< in: savepoint */
#ifndef UNIV_HOTBACKUP
/**********************************************************//**
Releases the (index tree) s-latch stored in an mtr memo after a
savepoint. */
UNIV_INLINE
void
mtr_release_s_latch_at_savepoint(
/*=============================*/
	mtr_t*		mtr,		/*!< in: mtr */
	ulint		savepoint,	/*!< in: savepoint */
	rw_lock_t*	lock);		/*!< in: latch to release */
#else /* !UNIV_HOTBACKUP */
# define mtr_release_s_latch_at_savepoint(mtr,savepoint,lock) ((void) 0)
#endif /* !UNIV_HOTBACKUP */
/***************************************************************//**
Gets the logging mode of a mini-transaction.
@return	logging mode: MTR_LOG_NONE, ... */
UNIV_INLINE
ulint
mtr_get_log_mode(
/*=============*/
	mtr_t*	mtr);	/*!< in: mtr */
/***************************************************************//**
Changes the logging mode of a mini-transaction.
@return	old mode */
UNIV_INLINE
ulint
mtr_set_log_mode(
/*=============*/
	mtr_t*	mtr,	/*!< in: mtr */
	ulint	mode);	/*!< in: logging mode: MTR_LOG_NONE, ... */
/********************************************************//**
Reads 1 - 4 bytes from a file page buffered in the buffer pool.
@return	value read */
UNIV_INTERN
ulint
mtr_read_ulint(
/*===========*/
	const byte*	ptr,	/*!< in: pointer from where to read */
	ulint		type,	/*!< in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES */
	mtr_t*		mtr);	/*!< in: mini-transaction handle */
/********************************************************//**
Reads 8 bytes from a file page buffered in the buffer pool.
@return	value read */
UNIV_INTERN
dulint
mtr_read_dulint(
/*============*/
	const byte*	ptr,	/*!< in: pointer from where to read */
	mtr_t*		mtr);	/*!< in: mini-transaction handle */
#ifndef UNIV_HOTBACKUP
/*********************************************************************//**
This macro locks an rw-lock in s-mode. */
#define mtr_s_lock(B, MTR)	mtr_s_lock_func((B), __FILE__, __LINE__,\
						(MTR))
/*********************************************************************//**
This macro locks an rw-lock in x-mode. */
#define mtr_x_lock(B, MTR)	mtr_x_lock_func((B), __FILE__, __LINE__,\
						(MTR))
/*********************************************************************//**
NOTE! Use the macro above!
Locks a lock in s-mode. */
UNIV_INLINE
void
mtr_s_lock_func(
/*============*/
	rw_lock_t*	lock,	/*!< in: rw-lock */
	const char*	file,	/*!< in: file name */
	ulint		line,	/*!< in: line number */
	mtr_t*		mtr);	/*!< in: mtr */
/*********************************************************************//**
NOTE! Use the macro above!
Locks a lock in x-mode. */
UNIV_INLINE
void
mtr_x_lock_func(
/*============*/
	rw_lock_t*	lock,	/*!< in: rw-lock */
	const char*	file,	/*!< in: file name */
	ulint		line,	/*!< in: line number */
	mtr_t*		mtr);	/*!< in: mtr */
#endif /* !UNIV_HOTBACKUP */

/***************************************************//**
Releases an object in the memo stack. */
UNIV_INTERN
void
mtr_memo_release(
/*=============*/
	mtr_t*	mtr,	/*!< in: mtr */
	void*	object,	/*!< in: object */
	ulint	type);	/*!< in: object type: MTR_MEMO_S_LOCK, ... */
#ifdef UNIV_DEBUG
# ifndef UNIV_HOTBACKUP
/**********************************************************//**
Checks if memo contains the given item.
@return	TRUE if contains */
UNIV_INLINE
ibool
mtr_memo_contains(
/*==============*/
	mtr_t*		mtr,	/*!< in: mtr */
	const void*	object,	/*!< in: object to search */
	ulint		type);	/*!< in: type of object */

/**********************************************************//**
Checks if memo contains the given page.
@return	TRUE if contains */
UNIV_INTERN
ibool
mtr_memo_contains_page(
/*===================*/
	mtr_t*		mtr,	/*!< in: mtr */
	const byte*	ptr,	/*!< in: pointer to buffer frame */
	ulint		type);	/*!< in: type of object */
/*********************************************************//**
Prints info of an mtr handle. */
UNIV_INTERN
void
mtr_print(
/*======*/
	mtr_t*	mtr);	/*!< in: mtr */
# else /* !UNIV_HOTBACKUP */
#  define mtr_memo_contains(mtr, object, type)		TRUE
#  define mtr_memo_contains_page(mtr, ptr, type)	TRUE
# endif /* !UNIV_HOTBACKUP */
#endif /* UNIV_DEBUG */
/*######################################################################*/

#define	MTR_BUF_MEMO_SIZE	200	/* number of slots in memo */

/***************************************************************//**
Returns the log object of a mini-transaction buffer.
@return	log */
UNIV_INLINE
dyn_array_t*
mtr_get_log(
/*========*/
	mtr_t*	mtr);	/*!< in: mini-transaction */
/***************************************************//**
Pushes an object to an mtr memo stack. */
UNIV_INLINE
void
mtr_memo_push(
/*==========*/
	mtr_t*	mtr,	/*!< in: mtr */
	void*	object,	/*!< in: object */
	ulint	type);	/*!< in: object type: MTR_MEMO_S_LOCK, ... */


/* Type definition of a mini-transaction memo stack slot. */
typedef	struct mtr_memo_slot_struct	mtr_memo_slot_t;
struct mtr_memo_slot_struct{
	ulint	type;	/*!< type of the stored object (MTR_MEMO_S_LOCK, ...) */
	void*	object;	/*!< pointer to the object */
};

/* Mini-transaction handle and buffer */
struct mtr_struct{
#ifdef UNIV_DEBUG
	ulint		state;	/*!< MTR_ACTIVE, MTR_COMMITTING, MTR_COMMITTED */
#endif
	dyn_array_t	memo;	/*!< memo stack for locks etc. */
	dyn_array_t	log;	/*!< mini-transaction log */
	ibool		modifications;
				/* TRUE if the mtr made modifications to
				buffer pool pages */
	ulint		n_log_recs;
				/* count of how many page initial log records
				have been written to the mtr log */
	ulint		log_mode; /* specifies which operations should be
				logged; default value MTR_LOG_ALL */
	ib_uint64_t	start_lsn;/* start lsn of the possible log entry for
				this mtr */
	ib_uint64_t	end_lsn;/* end lsn of the possible log entry for
				this mtr */
#ifdef UNIV_DEBUG
	ulint		magic_n;
#endif /* UNIV_DEBUG */
};

#ifdef UNIV_DEBUG
# define MTR_MAGIC_N		54551
#endif /* UNIV_DEBUG */

#define MTR_ACTIVE		12231
#define MTR_COMMITTING		56456
#define MTR_COMMITTED		34676

#ifndef UNIV_NONINL
#include "mtr0mtr.ic"
#endif

#endif