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

Copyright (c) 2000, 2009, MySQL AB & Innobase Oy. All Rights Reserved.
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Copyright (c) 2008, 2009 Google Inc.
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Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
briefly in the InnoDB documentation. The contributions by Google are
incorporated with their permission, and subject to the conditions contained in
the file COPYING.Google.

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

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

Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
Copyright (c) 2009, Percona Inc.

Portions of this file contain modifications contributed and copyrighted
by Percona Inc.. Those modifications are
gratefully acknowledged and are described briefly in the InnoDB
documentation. The contributions by Percona Inc. are incorporated with
their permission, and subject to the conditions contained in the file
COPYING.Percona.

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

***********************************************************************/
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/* TODO list for the InnoDB handler in 5.0:
  - Remove the flag trx->active_trans and look at trx->conc_state
  - fix savepoint functions to use savepoint storage area
  - Find out what kind of problems the OS X case-insensitivity causes to
    table and database names; should we 'normalize' the names like we do
    in Windows?
*/

#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation				// gcc: Class implementation
#endif

#include <mysql_priv.h>

#include <m_ctype.h>
#include <mysys_err.h>
#include <mysql/plugin.h>

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/** @file ha_innodb.cc */

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/* Include necessary InnoDB headers */
extern "C" {
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#include "univ.i"
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#include "buf0lru.h"
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#include "btr0sea.h"
#include "os0file.h"
#include "os0thread.h"
#include "srv0start.h"
#include "srv0srv.h"
#include "trx0roll.h"
#include "trx0trx.h"
#include "trx0sys.h"
#include "mtr0mtr.h"
#include "row0ins.h"
#include "row0mysql.h"
#include "row0sel.h"
#include "row0upd.h"
#include "log0log.h"
#include "lock0lock.h"
#include "dict0crea.h"
#include "btr0cur.h"
#include "btr0btr.h"
#include "fsp0fsp.h"
#include "sync0sync.h"
#include "fil0fil.h"
#include "trx0xa.h"
#include "row0merge.h"
#include "thr0loc.h"
#include "dict0boot.h"
#include "ha_prototypes.h"
#include "ut0mem.h"
#include "ibuf0ibuf.h"
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}

#include "ha_innodb.h"
#include "i_s.h"

#ifndef MYSQL_SERVER
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# ifndef MYSQL_PLUGIN_IMPORT
#  define MYSQL_PLUGIN_IMPORT /* nothing */
# endif /* MYSQL_PLUGIN_IMPORT */
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#if MYSQL_VERSION_ID < 50124
/* this is defined in mysql_priv.h inside #ifdef MYSQL_SERVER
but we need it here */
bool check_global_access(THD *thd, ulong want_access);
#endif /* MYSQL_VERSION_ID < 50124 */
#endif /* MYSQL_SERVER */

/** to protect innobase_open_files */
static pthread_mutex_t innobase_share_mutex;
/** to force correct commit order in binlog */
static pthread_mutex_t prepare_commit_mutex;
static ulong commit_threads = 0;
static pthread_mutex_t commit_threads_m;
static pthread_cond_t commit_cond;
static pthread_mutex_t commit_cond_m;
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static pthread_mutex_t analyze_mutex;
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static bool innodb_inited = 0;

#define INSIDE_HA_INNOBASE_CC

/* In the Windows plugin, the return value of current_thd is
undefined.  Map it to NULL. */
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#define EQ_CURRENT_THD(thd) ((thd) == current_thd)

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static struct handlerton* innodb_hton_ptr;

static const long AUTOINC_OLD_STYLE_LOCKING = 0;
static const long AUTOINC_NEW_STYLE_LOCKING = 1;
static const long AUTOINC_NO_LOCKING = 2;

static long innobase_mirrored_log_groups, innobase_log_files_in_group,
	innobase_log_buffer_size,
	innobase_additional_mem_pool_size, innobase_file_io_threads,
	innobase_force_recovery, innobase_open_files,
	innobase_autoinc_lock_mode;
static ulong innobase_commit_concurrency = 0;
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static ulong innobase_read_io_threads;
static ulong innobase_write_io_threads;
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static long long innobase_buffer_pool_size, innobase_log_file_size;

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/** Percentage of the buffer pool to reserve for 'old' blocks.
Connected to buf_LRU_old_ratio. */
static uint innobase_old_blocks_pct;

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/* The default values for the following char* start-up parameters
are determined in innobase_init below: */

static char*	innobase_data_home_dir			= NULL;
static char*	innobase_data_file_path			= NULL;
static char*	innobase_log_group_home_dir		= NULL;
static char*	innobase_file_format_name		= NULL;
static char*	innobase_change_buffering		= NULL;

/* Note: This variable can be set to on/off and any of the supported
file formats in the configuration file, but can only be set to any
of the supported file formats during runtime. */
static char*	innobase_file_format_check		= NULL;

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static char*	innobase_file_flush_method		= NULL;
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/* Below we have boolean-valued start-up parameters, and their default
values */

static ulong	innobase_fast_shutdown			= 1;
#ifdef UNIV_LOG_ARCHIVE
static my_bool	innobase_log_archive			= FALSE;
static char*	innobase_log_arch_dir			= NULL;
#endif /* UNIV_LOG_ARCHIVE */
static my_bool	innobase_use_doublewrite		= TRUE;
static my_bool	innobase_use_checksums			= TRUE;
static my_bool	innobase_locks_unsafe_for_binlog	= FALSE;
static my_bool	innobase_rollback_on_timeout		= FALSE;
static my_bool	innobase_create_status_file		= FALSE;
static my_bool	innobase_stats_on_metadata		= TRUE;

static char*	internal_innobase_data_file_path	= NULL;

static char*	innodb_version_str = (char*) INNODB_VERSION_STR;

/* The following counter is used to convey information to InnoDB
about server activity: in selects it is not sensible to call
srv_active_wake_master_thread after each fetch or search, we only do
it every INNOBASE_WAKE_INTERVAL'th step. */

#define INNOBASE_WAKE_INTERVAL	32
static ulong	innobase_active_counter	= 0;

static hash_table_t*	innobase_open_tables;

#ifdef __NETWARE__	/* some special cleanup for NetWare */
bool nw_panic = FALSE;
#endif

/** Allowed values of innodb_change_buffering */
static const char* innobase_change_buffering_values[IBUF_USE_COUNT] = {
	"none",		/* IBUF_USE_NONE */
	"inserts"	/* IBUF_USE_INSERT */
};

static INNOBASE_SHARE *get_share(const char *table_name);
static void free_share(INNOBASE_SHARE *share);
static int innobase_close_connection(handlerton *hton, THD* thd);
static int innobase_commit(handlerton *hton, THD* thd, bool all);
static int innobase_rollback(handlerton *hton, THD* thd, bool all);
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static int innobase_rollback_to_savepoint(handlerton *hton, THD* thd,
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           void *savepoint);
static int innobase_savepoint(handlerton *hton, THD* thd, void *savepoint);
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static int innobase_release_savepoint(handlerton *hton, THD* thd,
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           void *savepoint);
static handler *innobase_create_handler(handlerton *hton,
                                        TABLE_SHARE *table,
                                        MEM_ROOT *mem_root);

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/* "GEN_CLUST_INDEX" is the name reserved for Innodb default
system primary index. */
static const char innobase_index_reserve_name[]= "GEN_CLUST_INDEX";

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/** @brief Initialize the default value of innodb_commit_concurrency.

Once InnoDB is running, the innodb_commit_concurrency must not change
from zero to nonzero. (Bug #42101)

The initial default value is 0, and without this extra initialization,
SET GLOBAL innodb_commit_concurrency=DEFAULT would set the parameter
to 0, even if it was initially set to nonzero at the command line
or configuration file. */
static
void
innobase_commit_concurrency_init_default(void);
/*==========================================*/

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/************************************************************//**
Validate the file format name and return its corresponding id.
@return	valid file format id */
static
uint
innobase_file_format_name_lookup(
/*=============================*/
	const char*	format_name);		/*!< in: pointer to file format
						name */
/************************************************************//**
Validate the file format check config parameters, as a side effect it
sets the srv_check_file_format_at_startup variable.
@return	true if one of  "on" or "off" */
static
bool
innobase_file_format_check_on_off(
/*==============================*/
	const char*	format_check);		/*!< in: parameter value */
/************************************************************//**
Validate the file format check config parameters, as a side effect it
sets the srv_check_file_format_at_startup variable.
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@return	the format_id if valid config value, otherwise, return -1 */
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static
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int
innobase_file_format_validate_and_set(
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/*================================*/
	const char*	format_check);		/*!< in: parameter value */
/****************************************************************//**
Return alter table flags supported in an InnoDB database. */
static
uint
innobase_alter_table_flags(
/*=======================*/
	uint	flags);

static const char innobase_hton_name[]= "InnoDB";

/*************************************************************//**
Check for a valid value of innobase_commit_concurrency.
@return	0 for valid innodb_commit_concurrency */
static
int
innobase_commit_concurrency_validate(
/*=================================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	long long	intbuf;
	ulong		commit_concurrency;

	DBUG_ENTER("innobase_commit_concurrency_validate");

	if (value->val_int(value, &intbuf)) {
		/* The value is NULL. That is invalid. */
		DBUG_RETURN(1);
	}

	*reinterpret_cast<ulong*>(save) = commit_concurrency
		= static_cast<ulong>(intbuf);

	/* Allow the value to be updated, as long as it remains zero
	or nonzero. */
	DBUG_RETURN(!(!commit_concurrency == !innobase_commit_concurrency));
}

static MYSQL_THDVAR_BOOL(support_xa, PLUGIN_VAR_OPCMDARG,
  "Enable InnoDB support for the XA two-phase commit",
  /* check_func */ NULL, /* update_func */ NULL,
  /* default */ TRUE);

static MYSQL_THDVAR_BOOL(table_locks, PLUGIN_VAR_OPCMDARG,
  "Enable InnoDB locking in LOCK TABLES",
  /* check_func */ NULL, /* update_func */ NULL,
  /* default */ TRUE);

static MYSQL_THDVAR_BOOL(strict_mode, PLUGIN_VAR_OPCMDARG,
  "Use strict mode when evaluating create options.",
  NULL, NULL, FALSE);

static MYSQL_THDVAR_ULONG(lock_wait_timeout, PLUGIN_VAR_RQCMDARG,
  "Timeout in seconds an InnoDB transaction may wait for a lock before being rolled back. Values above 100000000 disable the timeout.",
  NULL, NULL, 50, 1, 1024 * 1024 * 1024, 0);


static handler *innobase_create_handler(handlerton *hton,
                                        TABLE_SHARE *table, 
                                        MEM_ROOT *mem_root)
{
  return new (mem_root) ha_innobase(hton, table);
}

/*******************************************************************//**
This function is used to prepare an X/Open XA distributed transaction.
@return	0 or error number */
static
int
innobase_xa_prepare(
/*================*/
        handlerton*	hton,	/*!< in: InnoDB handlerton */
	THD*		thd,	/*!< in: handle to the MySQL thread of
				the user whose XA transaction should
				be prepared */
	bool		all);	/*!< in: TRUE - commit transaction
				FALSE - the current SQL statement
				ended */
/*******************************************************************//**
This function is used to recover X/Open XA distributed transactions.
@return	number of prepared transactions stored in xid_list */
static
int
innobase_xa_recover(
/*================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	XID*		xid_list,/*!< in/out: prepared transactions */
	uint		len);	/*!< in: number of slots in xid_list */
/*******************************************************************//**
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state
@return	0 or error number */
static
int
innobase_commit_by_xid(
/*===================*/
	handlerton* hton,
	XID*	xid);	/*!< in: X/Open XA transaction identification */
/*******************************************************************//**
This function is used to rollback one X/Open XA distributed transaction
which is in the prepared state
@return	0 or error number */
static
int
innobase_rollback_by_xid(
/*=====================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	XID*		xid);	/*!< in: X/Open XA transaction
				identification */
/*******************************************************************//**
Create a consistent view for a cursor based on current transaction
which is created if the corresponding MySQL thread still lacks one.
This consistent view is then used inside of MySQL when accessing records
using a cursor.
@return	pointer to cursor view or NULL */
static
void*
innobase_create_cursor_view(
/*========================*/
	handlerton*	hton,	/*!< in: innobase hton */
	THD*		thd);	/*!< in: user thread handle */
/*******************************************************************//**
Set the given consistent cursor view to a transaction which is created
if the corresponding MySQL thread still lacks one. If the given
consistent cursor view is NULL global read view of a transaction is
restored to a transaction read view. */
static
void
innobase_set_cursor_view(
/*=====================*/
	handlerton* hton,
	THD*	thd,	/*!< in: user thread handle */
	void*	curview);/*!< in: Consistent cursor view to be set */
/*******************************************************************//**
Close the given consistent cursor view of a transaction and restore
global read view to a transaction read view. Transaction is created if the
corresponding MySQL thread still lacks one. */
static
void
innobase_close_cursor_view(
/*=======================*/
	handlerton* hton,
	THD*	thd,	/*!< in: user thread handle */
	void*	curview);/*!< in: Consistent read view to be closed */
/*****************************************************************//**
Removes all tables in the named database inside InnoDB. */
static
void
innobase_drop_database(
/*===================*/
	handlerton* hton, /*!< in: handlerton of Innodb */
	char*	path);	/*!< in: database path; inside InnoDB the name
			of the last directory in the path is used as
			the database name: for example, in 'mysql/data/test'
			the database name is 'test' */
/*******************************************************************//**
Closes an InnoDB database. */
static
int
innobase_end(handlerton *hton, ha_panic_function type);

/*****************************************************************//**
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
assigns a new snapshot for a consistent read if the transaction does not yet
have one.
@return	0 */
static
int
innobase_start_trx_and_assign_read_view(
/*====================================*/
	handlerton* hton, /*!< in: Innodb handlerton */ 
	THD*	thd);	/*!< in: MySQL thread handle of the user for whom
			the transaction should be committed */
/****************************************************************//**
Flushes InnoDB logs to disk and makes a checkpoint. Really, a commit flushes
the logs, and the name of this function should be innobase_checkpoint.
@return	TRUE if error */
static
bool
innobase_flush_logs(
/*================*/
	handlerton*	hton);	/*!< in: InnoDB handlerton */

/************************************************************************//**
Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
Monitor to the client. */
static
bool
innodb_show_status(
/*===============*/
	handlerton*	hton,	/*!< in: the innodb handlerton */
	THD*	thd,	/*!< in: the MySQL query thread of the caller */
	stat_print_fn *stat_print);
static
bool innobase_show_status(handlerton *hton, THD* thd, 
                          stat_print_fn* stat_print,
                          enum ha_stat_type stat_type);

/*****************************************************************//**
Commits a transaction in an InnoDB database. */
static
void
innobase_commit_low(
/*================*/
	trx_t*	trx);	/*!< in: transaction handle */

static SHOW_VAR innodb_status_variables[]= {
  {"buffer_pool_pages_data",
  (char*) &export_vars.innodb_buffer_pool_pages_data,	  SHOW_LONG},
  {"buffer_pool_pages_dirty",
  (char*) &export_vars.innodb_buffer_pool_pages_dirty,	  SHOW_LONG},
  {"buffer_pool_pages_flushed",
  (char*) &export_vars.innodb_buffer_pool_pages_flushed,  SHOW_LONG},
  {"buffer_pool_pages_free",
  (char*) &export_vars.innodb_buffer_pool_pages_free,	  SHOW_LONG},
#ifdef UNIV_DEBUG
  {"buffer_pool_pages_latched",
  (char*) &export_vars.innodb_buffer_pool_pages_latched,  SHOW_LONG},
#endif /* UNIV_DEBUG */
  {"buffer_pool_pages_misc",
  (char*) &export_vars.innodb_buffer_pool_pages_misc,	  SHOW_LONG},
  {"buffer_pool_pages_total",
  (char*) &export_vars.innodb_buffer_pool_pages_total,	  SHOW_LONG},
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  {"buffer_pool_read_ahead",
  (char*) &export_vars.innodb_buffer_pool_read_ahead,	  SHOW_LONG},
  {"buffer_pool_read_ahead_evicted",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_evicted, SHOW_LONG},
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  {"buffer_pool_read_requests",
  (char*) &export_vars.innodb_buffer_pool_read_requests,  SHOW_LONG},
  {"buffer_pool_reads",
  (char*) &export_vars.innodb_buffer_pool_reads,	  SHOW_LONG},
  {"buffer_pool_wait_free",
  (char*) &export_vars.innodb_buffer_pool_wait_free,	  SHOW_LONG},
  {"buffer_pool_write_requests",
  (char*) &export_vars.innodb_buffer_pool_write_requests, SHOW_LONG},
  {"data_fsyncs",
  (char*) &export_vars.innodb_data_fsyncs,		  SHOW_LONG},
  {"data_pending_fsyncs",
  (char*) &export_vars.innodb_data_pending_fsyncs,	  SHOW_LONG},
  {"data_pending_reads",
  (char*) &export_vars.innodb_data_pending_reads,	  SHOW_LONG},
  {"data_pending_writes",
  (char*) &export_vars.innodb_data_pending_writes,	  SHOW_LONG},
  {"data_read",
  (char*) &export_vars.innodb_data_read,		  SHOW_LONG},
  {"data_reads",
  (char*) &export_vars.innodb_data_reads,		  SHOW_LONG},
  {"data_writes",
  (char*) &export_vars.innodb_data_writes,		  SHOW_LONG},
  {"data_written",
  (char*) &export_vars.innodb_data_written,		  SHOW_LONG},
  {"dblwr_pages_written",
  (char*) &export_vars.innodb_dblwr_pages_written,	  SHOW_LONG},
  {"dblwr_writes",
  (char*) &export_vars.innodb_dblwr_writes,		  SHOW_LONG},
  {"have_atomic_builtins",
  (char*) &export_vars.innodb_have_atomic_builtins,	  SHOW_BOOL},
  {"log_waits",
  (char*) &export_vars.innodb_log_waits,		  SHOW_LONG},
  {"log_write_requests",
  (char*) &export_vars.innodb_log_write_requests,	  SHOW_LONG},
  {"log_writes",
  (char*) &export_vars.innodb_log_writes,		  SHOW_LONG},
  {"os_log_fsyncs",
  (char*) &export_vars.innodb_os_log_fsyncs,		  SHOW_LONG},
  {"os_log_pending_fsyncs",
  (char*) &export_vars.innodb_os_log_pending_fsyncs,	  SHOW_LONG},
  {"os_log_pending_writes",
  (char*) &export_vars.innodb_os_log_pending_writes,	  SHOW_LONG},
  {"os_log_written",
  (char*) &export_vars.innodb_os_log_written,		  SHOW_LONG},
  {"page_size",
  (char*) &export_vars.innodb_page_size,		  SHOW_LONG},
  {"pages_created",
  (char*) &export_vars.innodb_pages_created,		  SHOW_LONG},
  {"pages_read",
  (char*) &export_vars.innodb_pages_read,		  SHOW_LONG},
  {"pages_written",
  (char*) &export_vars.innodb_pages_written,		  SHOW_LONG},
  {"row_lock_current_waits",
  (char*) &export_vars.innodb_row_lock_current_waits,	  SHOW_LONG},
  {"row_lock_time",
  (char*) &export_vars.innodb_row_lock_time,		  SHOW_LONGLONG},
  {"row_lock_time_avg",
  (char*) &export_vars.innodb_row_lock_time_avg,	  SHOW_LONG},
  {"row_lock_time_max",
  (char*) &export_vars.innodb_row_lock_time_max,	  SHOW_LONG},
  {"row_lock_waits",
  (char*) &export_vars.innodb_row_lock_waits,		  SHOW_LONG},
  {"rows_deleted",
  (char*) &export_vars.innodb_rows_deleted,		  SHOW_LONG},
  {"rows_inserted",
  (char*) &export_vars.innodb_rows_inserted,		  SHOW_LONG},
  {"rows_read",
  (char*) &export_vars.innodb_rows_read,		  SHOW_LONG},
  {"rows_updated",
  (char*) &export_vars.innodb_rows_updated,		  SHOW_LONG},
  {NullS, NullS, SHOW_LONG}
};

/* General functions */

/******************************************************************//**
Returns true if the thread is the replication thread on the slave
server. Used in srv_conc_enter_innodb() to determine if the thread
should be allowed to enter InnoDB - the replication thread is treated
differently than other threads. Also used in
srv_conc_force_exit_innodb().
@return	true if thd is the replication thread */
extern "C" UNIV_INTERN
ibool
thd_is_replication_slave_thread(
/*============================*/
	void*	thd)	/*!< in: thread handle (THD*) */
{
	return((ibool) thd_slave_thread((THD*) thd));
}

/******************************************************************//**
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
static inline
void
innodb_srv_conc_enter_innodb(
/*=========================*/
	trx_t*	trx)	/*!< in: transaction handle */
{
	if (UNIV_LIKELY(!srv_thread_concurrency)) {

		return;
	}

	srv_conc_enter_innodb(trx);
}

/******************************************************************//**
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
static inline
void
innodb_srv_conc_exit_innodb(
/*========================*/
	trx_t*	trx)	/*!< in: transaction handle */
{
	if (UNIV_LIKELY(!trx->declared_to_be_inside_innodb)) {

		return;
	}

	srv_conc_exit_innodb(trx);
}

/******************************************************************//**
Releases possible search latch and InnoDB thread FIFO ticket. These should
be released at each SQL statement end, and also when mysqld passes the
control to the client. It does no harm to release these also in the middle
of an SQL statement. */
static inline
void
innobase_release_stat_resources(
/*============================*/
	trx_t*	trx)	/*!< in: transaction object */
{
	if (trx->has_search_latch) {
		trx_search_latch_release_if_reserved(trx);
	}

	if (trx->declared_to_be_inside_innodb) {
		/* Release our possible ticket in the FIFO */

		srv_conc_force_exit_innodb(trx);
	}
}

/******************************************************************//**
Returns true if the transaction this thread is processing has edited
non-transactional tables. Used by the deadlock detector when deciding
which transaction to rollback in case of a deadlock - we try to avoid
rolling back transactions that have edited non-transactional tables.
@return	true if non-transactional tables have been edited */
extern "C" UNIV_INTERN
ibool
thd_has_edited_nontrans_tables(
/*===========================*/
	void*	thd)	/*!< in: thread handle (THD*) */
{
	return((ibool) thd_non_transactional_update((THD*) thd));
}

/******************************************************************//**
Returns true if the thread is executing a SELECT statement.
@return	true if thd is executing SELECT */
extern "C" UNIV_INTERN
ibool
thd_is_select(
/*==========*/
	const void*	thd)	/*!< in: thread handle (THD*) */
{
	return(thd_sql_command((const THD*) thd) == SQLCOM_SELECT);
}

/******************************************************************//**
Returns true if the thread supports XA,
global value of innodb_supports_xa if thd is NULL.
@return	true if thd has XA support */
extern "C" UNIV_INTERN
ibool
thd_supports_xa(
/*============*/
	void*	thd)	/*!< in: thread handle (THD*), or NULL to query
			the global innodb_supports_xa */
{
	return(THDVAR((THD*) thd, support_xa));
}

/******************************************************************//**
Returns the lock wait timeout for the current connection.
@return	the lock wait timeout, in seconds */
extern "C" UNIV_INTERN
ulong
thd_lock_wait_timeout(
/*==================*/
	void*	thd)	/*!< in: thread handle (THD*), or NULL to query
			the global innodb_lock_wait_timeout */
{
	/* According to <mysql/plugin.h>, passing thd == NULL
	returns the global value of the session variable. */
	return(THDVAR((THD*) thd, lock_wait_timeout));
}

/********************************************************************//**
Obtain the InnoDB transaction of a MySQL thread.
@return	reference to transaction pointer */
static inline
trx_t*&
thd_to_trx(
/*=======*/
	THD*	thd)	/*!< in: MySQL thread */
{
	return(*(trx_t**) thd_ha_data(thd, innodb_hton_ptr));
}

/********************************************************************//**
Call this function when mysqld passes control to the client. That is to
avoid deadlocks on the adaptive hash S-latch possibly held by thd. For more
documentation, see handler.cc.
@return	0 */
static
int
innobase_release_temporary_latches(
/*===============================*/
	handlerton*	hton,	/*!< in: handlerton */
	THD*		thd)	/*!< in: MySQL thread */
{
	trx_t*	trx;

	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (!innodb_inited) {

		return(0);
	}

	trx = thd_to_trx(thd);

	if (trx) {
		innobase_release_stat_resources(trx);
	}
	return(0);
}

/********************************************************************//**
Increments innobase_active_counter and every INNOBASE_WAKE_INTERVALth
time calls srv_active_wake_master_thread. This function should be used
when a single database operation may introduce a small need for
server utility activity, like checkpointing. */
static inline
void
innobase_active_small(void)
/*=======================*/
{
	innobase_active_counter++;

	if ((innobase_active_counter % INNOBASE_WAKE_INTERVAL) == 0) {
		srv_active_wake_master_thread();
	}
}

/********************************************************************//**
Converts an InnoDB error code to a MySQL error code and also tells to MySQL
about a possible transaction rollback inside InnoDB caused by a lock wait
timeout or a deadlock.
@return	MySQL error code */
extern "C" UNIV_INTERN
int
convert_error_code_to_mysql(
/*========================*/
	int	error,	/*!< in: InnoDB error code */
	ulint	flags,	/*!< in: InnoDB table flags, or 0 */
	THD*	thd)	/*!< in: user thread handle or NULL */
{
	switch (error) {
	case DB_SUCCESS:
		return(0);

785 786 787
	case DB_INTERRUPTED:
		my_error(ER_QUERY_INTERRUPTED, MYF(0));
		/* fall through */
788 789 790 791 792
	case DB_ERROR:
	default:
		return(-1); /* unspecified error */

	case DB_DUPLICATE_KEY:
793 794 795 796 797 798
		/* Be cautious with returning this error, since
		mysql could re-enter the storage layer to get
		duplicated key info, the operation requires a
		valid table handle and/or transaction information,
		which might not always be available in the error
		handling stage. */
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		return(HA_ERR_FOUND_DUPP_KEY);

	case DB_FOREIGN_DUPLICATE_KEY:
		return(HA_ERR_FOREIGN_DUPLICATE_KEY);

	case DB_MISSING_HISTORY:
		return(HA_ERR_TABLE_DEF_CHANGED);

	case DB_RECORD_NOT_FOUND:
		return(HA_ERR_NO_ACTIVE_RECORD);

	case DB_DEADLOCK:
		/* Since we rolled back the whole transaction, we must
		tell it also to MySQL so that MySQL knows to empty the
		cached binlog for this transaction */

		if (thd) {
			thd_mark_transaction_to_rollback(thd, TRUE);
		}

		return(HA_ERR_LOCK_DEADLOCK);

	case DB_LOCK_WAIT_TIMEOUT:
		/* Starting from 5.0.13, we let MySQL just roll back the
		latest SQL statement in a lock wait timeout. Previously, we
		rolled back the whole transaction. */

		if (thd) {
			thd_mark_transaction_to_rollback(
				thd, (bool)row_rollback_on_timeout);
		}

		return(HA_ERR_LOCK_WAIT_TIMEOUT);

	case DB_NO_REFERENCED_ROW:
		return(HA_ERR_NO_REFERENCED_ROW);

	case DB_ROW_IS_REFERENCED:
		return(HA_ERR_ROW_IS_REFERENCED);

	case DB_CANNOT_ADD_CONSTRAINT:
		return(HA_ERR_CANNOT_ADD_FOREIGN);

	case DB_CANNOT_DROP_CONSTRAINT:

		return(HA_ERR_ROW_IS_REFERENCED); /* TODO: This is a bit
						misleading, a new MySQL error
						code should be introduced */

	case DB_COL_APPEARS_TWICE_IN_INDEX:
	case DB_CORRUPTION:
		return(HA_ERR_CRASHED);

	case DB_OUT_OF_FILE_SPACE:
		return(HA_ERR_RECORD_FILE_FULL);

	case DB_TABLE_IS_BEING_USED:
		return(HA_ERR_WRONG_COMMAND);

	case DB_TABLE_NOT_FOUND:
		return(HA_ERR_NO_SUCH_TABLE);

	case DB_TOO_BIG_RECORD:
		my_error(ER_TOO_BIG_ROWSIZE, MYF(0),
			 page_get_free_space_of_empty(flags
						      & DICT_TF_COMPACT) / 2);
		return(HA_ERR_TO_BIG_ROW);

	case DB_NO_SAVEPOINT:
		return(HA_ERR_NO_SAVEPOINT);

	case DB_LOCK_TABLE_FULL:
		/* Since we rolled back the whole transaction, we must
		tell it also to MySQL so that MySQL knows to empty the
		cached binlog for this transaction */

		if (thd) {
			thd_mark_transaction_to_rollback(thd, TRUE);
		}

		return(HA_ERR_LOCK_TABLE_FULL);

	case DB_PRIMARY_KEY_IS_NULL:
		return(ER_PRIMARY_CANT_HAVE_NULL);

	case DB_TOO_MANY_CONCURRENT_TRXS:
885 886 887 888 889 890
		/* New error code HA_ERR_TOO_MANY_CONCURRENT_TRXS is only
		available in 5.1.38 and later, but the plugin should still
		work with previous versions of MySQL. */
#ifdef HA_ERR_TOO_MANY_CONCURRENT_TRXS
		return(HA_ERR_TOO_MANY_CONCURRENT_TRXS);
#else /* HA_ERR_TOO_MANY_CONCURRENT_TRXS */
891
		return(HA_ERR_RECORD_FILE_FULL);
892
#endif /* HA_ERR_TOO_MANY_CONCURRENT_TRXS */
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	case DB_UNSUPPORTED:
		return(HA_ERR_UNSUPPORTED);
	}
}

/*************************************************************//**
Prints info of a THD object (== user session thread) to the given file. */
extern "C" UNIV_INTERN
void
innobase_mysql_print_thd(
/*=====================*/
	FILE*	f,		/*!< in: output stream */
	void*	thd,		/*!< in: pointer to a MySQL THD object */
	uint	max_query_len)	/*!< in: max query length to print, or 0 to
				   use the default max length */
{
	char	buffer[1024];

	fputs(thd_security_context((THD*) thd, buffer, sizeof buffer,
				   max_query_len), f);
	putc('\n', f);
}

/******************************************************************//**
Get the variable length bounds of the given character set. */
extern "C" UNIV_INTERN
void
innobase_get_cset_width(
/*====================*/
	ulint	cset,		/*!< in: MySQL charset-collation code */
	ulint*	mbminlen,	/*!< out: minimum length of a char (in bytes) */
	ulint*	mbmaxlen)	/*!< out: maximum length of a char (in bytes) */
{
	CHARSET_INFO*	cs;
	ut_ad(cset < 256);
	ut_ad(mbminlen);
	ut_ad(mbmaxlen);

	cs = all_charsets[cset];
	if (cs) {
		*mbminlen = cs->mbminlen;
		*mbmaxlen = cs->mbmaxlen;
	} else {
936 937 938
		THD*	thd = current_thd;

		if (thd && thd_sql_command(thd) == SQLCOM_DROP_TABLE) {
939 940 941 942 943 944 945 946 947 948 949 950 951 952

			/* Fix bug#46256: allow tables to be dropped if the
			collation is not found, but issue a warning. */
			if ((global_system_variables.log_warnings)
			    && (cset != 0)){

				sql_print_warning(
					"Unknown collation #%lu.", cset);
			}
		} else {

			ut_a(cset == 0);
		}

953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
		*mbminlen = *mbmaxlen = 0;
	}
}

/******************************************************************//**
Converts an identifier to a table name. */
extern "C" UNIV_INTERN
void
innobase_convert_from_table_id(
/*===========================*/
	struct charset_info_st*	cs,	/*!< in: the 'from' character set */
	char*			to,	/*!< out: converted identifier */
	const char*		from,	/*!< in: identifier to convert */
	ulint			len)	/*!< in: length of 'to', in bytes */
{
	uint	errors;

	strconvert(cs, from, &my_charset_filename, to, (uint) len, &errors);
}

/******************************************************************//**
Converts an identifier to UTF-8. */
extern "C" UNIV_INTERN
void
innobase_convert_from_id(
/*=====================*/
	struct charset_info_st*	cs,	/*!< in: the 'from' character set */
	char*			to,	/*!< out: converted identifier */
	const char*		from,	/*!< in: identifier to convert */
	ulint			len)	/*!< in: length of 'to', in bytes */
{
	uint	errors;

	strconvert(cs, from, system_charset_info, to, (uint) len, &errors);
}

/******************************************************************//**
Compares NUL-terminated UTF-8 strings case insensitively.
@return	0 if a=b, <0 if a<b, >1 if a>b */
extern "C" UNIV_INTERN
int
innobase_strcasecmp(
/*================*/
	const char*	a,	/*!< in: first string to compare */
	const char*	b)	/*!< in: second string to compare */
{
	return(my_strcasecmp(system_charset_info, a, b));
}

/******************************************************************//**
Makes all characters in a NUL-terminated UTF-8 string lower case. */
extern "C" UNIV_INTERN
void
innobase_casedn_str(
/*================*/
	char*	a)	/*!< in/out: string to put in lower case */
{
	my_casedn_str(system_charset_info, a);
}

/**********************************************************************//**
Determines the connection character set.
@return	connection character set */
extern "C" UNIV_INTERN
struct charset_info_st*
innobase_get_charset(
/*=================*/
	void*	mysql_thd)	/*!< in: MySQL thread handle */
{
	return(thd_charset((THD*) mysql_thd));
}

#if defined (__WIN__) && defined (MYSQL_DYNAMIC_PLUGIN)
1026
extern MYSQL_PLUGIN_IMPORT MY_TMPDIR mysql_tmpdir_list;
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/*******************************************************************//**
Map an OS error to an errno value. The OS error number is stored in
_doserrno and the mapped value is stored in errno) */
extern "C"
void __cdecl
_dosmaperr(
	unsigned long);	/*!< in: OS error value */

/*********************************************************************//**
Creates a temporary file.
@return	temporary file descriptor, or < 0 on error */
extern "C" UNIV_INTERN
int
innobase_mysql_tmpfile(void)
/*========================*/
{
	int	fd;				/* handle of opened file */
	HANDLE	osfh;				/* OS handle of opened file */
	char*	tmpdir;				/* point to the directory
						where to create file */
	TCHAR	path_buf[MAX_PATH - 14];	/* buffer for tmp file path.
						The length cannot be longer
						than MAX_PATH - 14, or
						GetTempFileName will fail. */
	char	filename[MAX_PATH];		/* name of the tmpfile */
	DWORD	fileaccess = GENERIC_READ	/* OS file access */
			     | GENERIC_WRITE
			     | DELETE;
	DWORD	fileshare = FILE_SHARE_READ	/* OS file sharing mode */
			    | FILE_SHARE_WRITE
			    | FILE_SHARE_DELETE;
	DWORD	filecreate = CREATE_ALWAYS;	/* OS method of open/create */
	DWORD	fileattrib =			/* OS file attribute flags */
			     FILE_ATTRIBUTE_NORMAL
			     | FILE_FLAG_DELETE_ON_CLOSE
			     | FILE_ATTRIBUTE_TEMPORARY
			     | FILE_FLAG_SEQUENTIAL_SCAN;

	DBUG_ENTER("innobase_mysql_tmpfile");

	tmpdir = my_tmpdir(&mysql_tmpdir_list);

	/* The tmpdir parameter can not be NULL for GetTempFileName. */
	if (!tmpdir) {
		uint	ret;

		/* Use GetTempPath to determine path for temporary files. */
		ret = GetTempPath(sizeof(path_buf), path_buf);
		if (ret > sizeof(path_buf) || (ret == 0)) {

			_dosmaperr(GetLastError());	/* map error */
			DBUG_RETURN(-1);
		}

		tmpdir = path_buf;
	}

	/* Use GetTempFileName to generate a unique filename. */
	if (!GetTempFileName(tmpdir, "ib", 0, filename)) {

		_dosmaperr(GetLastError());	/* map error */
		DBUG_RETURN(-1);
	}

	DBUG_PRINT("info", ("filename: %s", filename));

	/* Open/Create the file. */
	osfh = CreateFile(filename, fileaccess, fileshare, NULL,
			  filecreate, fileattrib, NULL);
	if (osfh == INVALID_HANDLE_VALUE) {

		/* open/create file failed! */
		_dosmaperr(GetLastError());	/* map error */
		DBUG_RETURN(-1);
	}

	do {
		/* Associates a CRT file descriptor with the OS file handle. */
		fd = _open_osfhandle((intptr_t) osfh, 0);
	} while (fd == -1 && errno == EINTR);

	if (fd == -1) {
		/* Open failed, close the file handle. */

		_dosmaperr(GetLastError());	/* map error */
		CloseHandle(osfh);		/* no need to check if
						CloseHandle fails */
	}

	DBUG_RETURN(fd);
}
#else
/*********************************************************************//**
Creates a temporary file.
@return	temporary file descriptor, or < 0 on error */
extern "C" UNIV_INTERN
int
innobase_mysql_tmpfile(void)
/*========================*/
{
	int	fd2 = -1;
	File	fd = mysql_tmpfile("ib");
	if (fd >= 0) {
		/* Copy the file descriptor, so that the additional resources
		allocated by create_temp_file() can be freed by invoking
		my_close().

		Because the file descriptor returned by this function
		will be passed to fdopen(), it will be closed by invoking
		fclose(), which in turn will invoke close() instead of
		my_close(). */
		fd2 = dup(fd);
		if (fd2 < 0) {
			DBUG_PRINT("error",("Got error %d on dup",fd2));
			my_errno=errno;
			my_error(EE_OUT_OF_FILERESOURCES,
				 MYF(ME_BELL+ME_WAITTANG),
				 "ib*", my_errno);
		}
		my_close(fd, MYF(MY_WME));
	}
	return(fd2);
}
#endif /* defined (__WIN__) && defined (MYSQL_DYNAMIC_PLUGIN) */

/*********************************************************************//**
Wrapper around MySQL's copy_and_convert function.
@return	number of bytes copied to 'to' */
extern "C" UNIV_INTERN
ulint
innobase_convert_string(
/*====================*/
	void*		to,		/*!< out: converted string */
	ulint		to_length,	/*!< in: number of bytes reserved
					for the converted string */
	CHARSET_INFO*	to_cs,		/*!< in: character set to convert to */
	const void*	from,		/*!< in: string to convert */
	ulint		from_length,	/*!< in: number of bytes to convert */
	CHARSET_INFO*	from_cs,	/*!< in: character set to convert from */
	uint*		errors)		/*!< out: number of errors encountered
					during the conversion */
{
  return(copy_and_convert((char*)to, (uint32) to_length, to_cs,
                          (const char*)from, (uint32) from_length, from_cs,
                          errors));
}

/*******************************************************************//**
Formats the raw data in "data" (in InnoDB on-disk format) that is of
type DATA_(CHAR|VARCHAR|MYSQL|VARMYSQL) using "charset_coll" and writes
the result to "buf". The result is converted to "system_charset_info".
Not more than "buf_size" bytes are written to "buf".
The result is always NUL-terminated (provided buf_size > 0) and the
number of bytes that were written to "buf" is returned (including the
terminating NUL).
@return	number of bytes that were written */
extern "C" UNIV_INTERN
ulint
innobase_raw_format(
/*================*/
	const char*	data,		/*!< in: raw data */
	ulint		data_len,	/*!< in: raw data length
					in bytes */
	ulint		charset_coll,	/*!< in: charset collation */
	char*		buf,		/*!< out: output buffer */
	ulint		buf_size)	/*!< in: output buffer size
					in bytes */
{
	/* XXX we use a hard limit instead of allocating
	but_size bytes from the heap */
	CHARSET_INFO*	data_cs;
	char		buf_tmp[8192];
	ulint		buf_tmp_used;
	uint		num_errors;

	data_cs = all_charsets[charset_coll];

	buf_tmp_used = innobase_convert_string(buf_tmp, sizeof(buf_tmp),
					       system_charset_info,
					       data, data_len, data_cs,
					       &num_errors);

	return(ut_str_sql_format(buf_tmp, buf_tmp_used, buf, buf_size));
}

/*********************************************************************//**
Compute the next autoinc value.

For MySQL replication the autoincrement values can be partitioned among
the nodes. The offset is the start or origin of the autoincrement value
for a particular node. For n nodes the increment will be n and the offset
will be in the interval [1, n]. The formula tries to allocate the next
value for a particular node.

Note: This function is also called with increment set to the number of
values we want to reserve for multi-value inserts e.g.,

	INSERT INTO T VALUES(), (), ();

innobase_next_autoinc() will be called with increment set to
n * 3 where autoinc_lock_mode != TRADITIONAL because we want
to reserve 3 values for the multi-value INSERT above.
@return	the next value */
static
ulonglong
innobase_next_autoinc(
/*==================*/
	ulonglong	current,	/*!< in: Current value */
	ulonglong	increment,	/*!< in: increment current by */
	ulonglong	offset,		/*!< in: AUTOINC offset */
	ulonglong	max_value)	/*!< in: max value for type */
{
	ulonglong	next_value;

	/* Should never be 0. */
	ut_a(increment > 0);

	/* According to MySQL documentation, if the offset is greater than
	the increment then the offset is ignored. */
	if (offset > increment) {
		offset = 0;
	}

	if (max_value <= current) {
		next_value = max_value;
	} else if (offset <= 1) {
		/* Offset 0 and 1 are the same, because there must be at
		least one node in the system. */
		if (max_value - current <= increment) {
			next_value = max_value;
		} else {
			next_value = current + increment;
		}
	} else if (max_value > current) {
		if (current > offset) {
			next_value = ((current - offset) / increment) + 1;
		} else {
			next_value = ((offset - current) / increment) + 1;
		}

		ut_a(increment > 0);
		ut_a(next_value > 0);

		/* Check for multiplication overflow. */
		if (increment > (max_value / next_value)) {

			next_value = max_value;
		} else {
			next_value *= increment;

			ut_a(max_value >= next_value);

			/* Check for overflow. */
			if (max_value - next_value <= offset) {
				next_value = max_value;
			} else {
				next_value += offset;
			}
		}
	} else {
		next_value = max_value;
	}

	ut_a(next_value <= max_value);

	return(next_value);
}

/*********************************************************************//**
Initializes some fields in an InnoDB transaction object. */
static
void
innobase_trx_init(
/*==============*/
	THD*	thd,	/*!< in: user thread handle */
	trx_t*	trx)	/*!< in/out: InnoDB transaction handle */
{
	DBUG_ENTER("innobase_trx_init");
	DBUG_ASSERT(EQ_CURRENT_THD(thd));
	DBUG_ASSERT(thd == trx->mysql_thd);

	trx->check_foreigns = !thd_test_options(
		thd, OPTION_NO_FOREIGN_KEY_CHECKS);

	trx->check_unique_secondary = !thd_test_options(
		thd, OPTION_RELAXED_UNIQUE_CHECKS);

	DBUG_VOID_RETURN;
}

/*********************************************************************//**
Allocates an InnoDB transaction for a MySQL handler object.
@return	InnoDB transaction handle */
extern "C" UNIV_INTERN
trx_t*
innobase_trx_allocate(
/*==================*/
	THD*	thd)	/*!< in: user thread handle */
{
	trx_t*	trx;

	DBUG_ENTER("innobase_trx_allocate");
	DBUG_ASSERT(thd != NULL);
	DBUG_ASSERT(EQ_CURRENT_THD(thd));

	trx = trx_allocate_for_mysql();

	trx->mysql_thd = thd;
	trx->mysql_query_str = thd_query(thd);

	innobase_trx_init(thd, trx);

	DBUG_RETURN(trx);
}

/*********************************************************************//**
Gets the InnoDB transaction handle for a MySQL handler object, creates
an InnoDB transaction struct if the corresponding MySQL thread struct still
lacks one.
@return	InnoDB transaction handle */
static
trx_t*
check_trx_exists(
/*=============*/
	THD*	thd)	/*!< in: user thread handle */
{
	trx_t*&	trx = thd_to_trx(thd);

	ut_ad(EQ_CURRENT_THD(thd));

	if (trx == NULL) {
		trx = innobase_trx_allocate(thd);
	} else if (UNIV_UNLIKELY(trx->magic_n != TRX_MAGIC_N)) {
		mem_analyze_corruption(trx);
		ut_error;
	}

	innobase_trx_init(thd, trx);

	return(trx);
}


/*********************************************************************//**
Construct ha_innobase handler. */
UNIV_INTERN
ha_innobase::ha_innobase(handlerton *hton, TABLE_SHARE *table_arg)
  :handler(hton, table_arg),
  int_table_flags(HA_REC_NOT_IN_SEQ |
		  HA_NULL_IN_KEY |
		  HA_CAN_INDEX_BLOBS |
		  HA_CAN_SQL_HANDLER |
		  HA_PRIMARY_KEY_REQUIRED_FOR_POSITION |
		  HA_PRIMARY_KEY_IN_READ_INDEX |
		  HA_BINLOG_ROW_CAPABLE |
		  HA_CAN_GEOMETRY | HA_PARTIAL_COLUMN_READ |
		  HA_TABLE_SCAN_ON_INDEX),
  start_of_scan(0),
  num_write_row(0)
{}

/*********************************************************************//**
Destruct ha_innobase handler. */
UNIV_INTERN
ha_innobase::~ha_innobase()
{
}

/*********************************************************************//**
Updates the user_thd field in a handle and also allocates a new InnoDB
transaction handle if needed, and updates the transaction fields in the
prebuilt struct. */
UNIV_INTERN inline
void
ha_innobase::update_thd(
/*====================*/
	THD*	thd)	/*!< in: thd to use the handle */
{
	trx_t*		trx;

	trx = check_trx_exists(thd);

	if (prebuilt->trx != trx) {

		row_update_prebuilt_trx(prebuilt, trx);
	}

	user_thd = thd;
}

/*********************************************************************//**
Updates the user_thd field in a handle and also allocates a new InnoDB
transaction handle if needed, and updates the transaction fields in the
prebuilt struct. */
UNIV_INTERN
void
ha_innobase::update_thd()
/*=====================*/
{
	THD*	thd = ha_thd();
	ut_ad(EQ_CURRENT_THD(thd));
	update_thd(thd);
}

/*********************************************************************//**
Registers that InnoDB takes part in an SQL statement, so that MySQL knows to
roll back the statement if the statement results in an error. This MUST be
called for every SQL statement that may be rolled back by MySQL. Calling this
several times to register the same statement is allowed, too. */
static inline
void
innobase_register_stmt(
/*===================*/
        handlerton*	hton,	/*!< in: Innobase hton */
	THD*	thd)	/*!< in: MySQL thd (connection) object */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);
	/* Register the statement */
	trans_register_ha(thd, FALSE, hton);
}

/*********************************************************************//**
Registers an InnoDB transaction in MySQL, so that the MySQL XA code knows
to call the InnoDB prepare and commit, or rollback for the transaction. This
MUST be called for every transaction for which the user may call commit or
rollback. Calling this several times to register the same transaction is
allowed, too.
This function also registers the current SQL statement. */
static inline
void
innobase_register_trx_and_stmt(
/*===========================*/
        handlerton *hton, /*!< in: Innobase handlerton */
	THD*	thd)	/*!< in: MySQL thd (connection) object */
{
	/* NOTE that actually innobase_register_stmt() registers also
	the transaction in the AUTOCOMMIT=1 mode. */

	innobase_register_stmt(hton, thd);

	if (thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

		/* No autocommit mode, register for a transaction */
		trans_register_ha(thd, TRUE, hton);
	}
}

/*   BACKGROUND INFO: HOW THE MYSQL QUERY CACHE WORKS WITH INNODB
     ------------------------------------------------------------

1) The use of the query cache for TBL is disabled when there is an
uncommitted change to TBL.

2) When a change to TBL commits, InnoDB stores the current value of
its global trx id counter, let us denote it by INV_TRX_ID, to the table object
in the InnoDB data dictionary, and does only allow such transactions whose
id <= INV_TRX_ID to use the query cache.

3) When InnoDB does an INSERT/DELETE/UPDATE to a table TBL, or an implicit
modification because an ON DELETE CASCADE, we invalidate the MySQL query cache
of TBL immediately.

How this is implemented inside InnoDB:

1) Since every modification always sets an IX type table lock on the InnoDB
table, it is easy to check if there can be uncommitted modifications for a
table: just check if there are locks in the lock list of the table.

2) When a transaction inside InnoDB commits, it reads the global trx id
counter and stores the value INV_TRX_ID to the tables on which it had a lock.

3) If there is an implicit table change from ON DELETE CASCADE or SET NULL,
InnoDB calls an invalidate method for the MySQL query cache for that table.

How this is implemented inside sql_cache.cc:

1) The query cache for an InnoDB table TBL is invalidated immediately at an
INSERT/UPDATE/DELETE, just like in the case of MyISAM. No need to delay
invalidation to the transaction commit.

2) To store or retrieve a value from the query cache of an InnoDB table TBL,
any query must first ask InnoDB's permission. We must pass the thd as a
parameter because InnoDB will look at the trx id, if any, associated with
that thd.

3) Use of the query cache for InnoDB tables is now allowed also when
AUTOCOMMIT==0 or we are inside BEGIN ... COMMIT. Thus transactions no longer
put restrictions on the use of the query cache.
*/

/******************************************************************//**
The MySQL query cache uses this to check from InnoDB if the query cache at
the moment is allowed to operate on an InnoDB table. The SQL query must
be a non-locking SELECT.

The query cache is allowed to operate on certain query only if this function
returns TRUE for all tables in the query.

If thd is not in the autocommit state, this function also starts a new
transaction for thd if there is no active trx yet, and assigns a consistent
read view to it if there is no read view yet.

Why a deadlock of threads is not possible: the query cache calls this function
at the start of a SELECT processing. Then the calling thread cannot be
holding any InnoDB semaphores. The calling thread is holding the
query cache mutex, and this function will reserver the InnoDB kernel mutex.
Thus, the 'rank' in sync0sync.h of the MySQL query cache mutex is above
the InnoDB kernel mutex.
@return TRUE if permitted, FALSE if not; note that the value FALSE
does not mean we should invalidate the query cache: invalidation is
called explicitly */
static
my_bool
innobase_query_caching_of_table_permitted(
/*======================================*/
	THD*	thd,		/*!< in: thd of the user who is trying to
				store a result to the query cache or
				retrieve it */
	char*	full_name,	/*!< in: concatenation of database name,
				the null character NUL, and the table
				name */
	uint	full_name_len,	/*!< in: length of the full name, i.e.
				len(dbname) + len(tablename) + 1 */
	ulonglong *unused)	/*!< unused for this engine */
{
	ibool	is_autocommit;
	trx_t*	trx;
	char	norm_name[1000];

	ut_a(full_name_len < 999);

	trx = check_trx_exists(thd);

	if (trx->isolation_level == TRX_ISO_SERIALIZABLE) {
		/* In the SERIALIZABLE mode we add LOCK IN SHARE MODE to every
		plain SELECT if AUTOCOMMIT is not on. */

		return((my_bool)FALSE);
	}

	if (trx->has_search_latch) {
		sql_print_error("The calling thread is holding the adaptive "
				"search, latch though calling "
				"innobase_query_caching_of_table_permitted.");

		mutex_enter(&kernel_mutex);
		trx_print(stderr, trx, 1024);
		mutex_exit(&kernel_mutex);
	}

	innobase_release_stat_resources(trx);

	if (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

		is_autocommit = TRUE;
	} else {
		is_autocommit = FALSE;

	}

	if (is_autocommit && trx->n_mysql_tables_in_use == 0) {
		/* We are going to retrieve the query result from the query
		cache. This cannot be a store operation to the query cache
		because then MySQL would have locks on tables already.

		TODO: if the user has used LOCK TABLES to lock the table,
		then we open a transaction in the call of row_.. below.
		That trx can stay open until UNLOCK TABLES. The same problem
		exists even if we do not use the query cache. MySQL should be
		modified so that it ALWAYS calls some cleanup function when
		the processing of a query ends!

		We can imagine we instantaneously serialize this consistent
		read trx to the current trx id counter. If trx2 would have
		changed the tables of a query result stored in the cache, and
		trx2 would have already committed, making the result obsolete,
		then trx2 would have already invalidated the cache. Thus we
		can trust the result in the cache is ok for this query. */

		return((my_bool)TRUE);
	}

	/* Normalize the table name to InnoDB format */

	memcpy(norm_name, full_name, full_name_len);

	norm_name[strlen(norm_name)] = '/'; /* InnoDB uses '/' as the
					    separator between db and table */
	norm_name[full_name_len] = '\0';
#ifdef __WIN__
	innobase_casedn_str(norm_name);
#endif
	/* The call of row_search_.. will start a new transaction if it is
	not yet started */

	if (trx->active_trans == 0) {

		innobase_register_trx_and_stmt(innodb_hton_ptr, thd);
		trx->active_trans = 1;
	}

	if (row_search_check_if_query_cache_permitted(trx, norm_name)) {

		/* printf("Query cache for %s permitted\n", norm_name); */

		return((my_bool)TRUE);
	}

	/* printf("Query cache for %s NOT permitted\n", norm_name); */

	return((my_bool)FALSE);
}

/*****************************************************************//**
Invalidates the MySQL query cache for the table. */
extern "C" UNIV_INTERN
void
innobase_invalidate_query_cache(
/*============================*/
	trx_t*		trx,		/*!< in: transaction which
					modifies the table */
	const char*	full_name,	/*!< in: concatenation of
					database name, null char NUL,
					table name, null char NUL;
					NOTE that in Windows this is
					always in LOWER CASE! */
	ulint		full_name_len)	/*!< in: full name length where
					also the null chars count */
{
	/* Note that the sync0sync.h rank of the query cache mutex is just
	above the InnoDB kernel mutex. The caller of this function must not
	have latches of a lower rank. */

	/* Argument TRUE below means we are using transactions */
#ifdef HAVE_QUERY_CACHE
	mysql_query_cache_invalidate4((THD*) trx->mysql_thd,
				      full_name,
				      (uint32) full_name_len,
				      TRUE);
#endif
}

/*****************************************************************//**
Convert an SQL identifier to the MySQL system_charset_info (UTF-8)
and quote it if needed.
@return	pointer to the end of buf */
static
char*
innobase_convert_identifier(
/*========================*/
	char*		buf,	/*!< out: buffer for converted identifier */
	ulint		buflen,	/*!< in: length of buf, in bytes */
	const char*	id,	/*!< in: identifier to convert */
	ulint		idlen,	/*!< in: length of id, in bytes */
	void*		thd,	/*!< in: MySQL connection thread, or NULL */
	ibool		file_id)/*!< in: TRUE=id is a table or database name;
				FALSE=id is an UTF-8 string */
{
	char nz[NAME_LEN + 1];
1686 1687 1688
#if MYSQL_VERSION_ID >= 50141
	char nz2[NAME_LEN + 1 + EXPLAIN_FILENAME_MAX_EXTRA_LENGTH];
#else /* MYSQL_VERSION_ID >= 50141 */
1689
	char nz2[NAME_LEN + 1 + sizeof srv_mysql50_table_name_prefix];
1690
#endif /* MYSQL_VERSION_ID >= 50141 */
1691 1692 1693 1694 1695

	const char*	s	= id;
	int		q;

	if (file_id) {
1696 1697 1698
		/* Decode the table name.  The MySQL function expects
		a NUL-terminated string.  The input and output strings
		buffers must not be shared. */
1699 1700 1701 1702 1703 1704 1705 1706 1707

		if (UNIV_UNLIKELY(idlen > (sizeof nz) - 1)) {
			idlen = (sizeof nz) - 1;
		}

		memcpy(nz, id, idlen);
		nz[idlen] = 0;

		s = nz2;
1708 1709 1710 1711 1712
#if MYSQL_VERSION_ID >= 50141
		idlen = explain_filename((THD*) thd, nz, nz2, sizeof nz2,
					 EXPLAIN_PARTITIONS_AS_COMMENT);
		goto no_quote;
#else /* MYSQL_VERSION_ID >= 50141 */
1713
		idlen = filename_to_tablename(nz, nz2, sizeof nz2);
1714
#endif /* MYSQL_VERSION_ID >= 50141 */
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724
	}

	/* See if the identifier needs to be quoted. */
	if (UNIV_UNLIKELY(!thd)) {
		q = '"';
	} else {
		q = get_quote_char_for_identifier((THD*) thd, s, (int) idlen);
	}

	if (q == EOF) {
1725 1726 1727
#if MYSQL_VERSION_ID >= 50141
no_quote:
#endif /* MYSQL_VERSION_ID >= 50141 */
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
		if (UNIV_UNLIKELY(idlen > buflen)) {
			idlen = buflen;
		}
		memcpy(buf, s, idlen);
		return(buf + idlen);
	}

	/* Quote the identifier. */
	if (buflen < 2) {
		return(buf);
	}

	*buf++ = q;
	buflen--;

	for (; idlen; idlen--) {
		int	c = *s++;
		if (UNIV_UNLIKELY(c == q)) {
			if (UNIV_UNLIKELY(buflen < 3)) {
				break;
			}

			*buf++ = c;
			*buf++ = c;
			buflen -= 2;
		} else {
			if (UNIV_UNLIKELY(buflen < 2)) {
				break;
			}

			*buf++ = c;
			buflen--;
		}
	}

	*buf++ = q;
	return(buf);
}

/*****************************************************************//**
Convert a table or index name to the MySQL system_charset_info (UTF-8)
and quote it if needed.
@return	pointer to the end of buf */
extern "C" UNIV_INTERN
char*
innobase_convert_name(
/*==================*/
	char*		buf,	/*!< out: buffer for converted identifier */
	ulint		buflen,	/*!< in: length of buf, in bytes */
	const char*	id,	/*!< in: identifier to convert */
	ulint		idlen,	/*!< in: length of id, in bytes */
	void*		thd,	/*!< in: MySQL connection thread, or NULL */
	ibool		table_id)/*!< in: TRUE=id is a table or database name;
				FALSE=id is an index name */
{
	char*		s	= buf;
	const char*	bufend	= buf + buflen;

	if (table_id) {
		const char*	slash = (const char*) memchr(id, '/', idlen);
		if (!slash) {

			goto no_db_name;
		}

		/* Print the database name and table name separately. */
		s = innobase_convert_identifier(s, bufend - s, id, slash - id,
						thd, TRUE);
		if (UNIV_LIKELY(s < bufend)) {
			*s++ = '.';
			s = innobase_convert_identifier(s, bufend - s,
							slash + 1, idlen
							- (slash - id) - 1,
							thd, TRUE);
		}
	} else if (UNIV_UNLIKELY(*id == TEMP_INDEX_PREFIX)) {
		/* Temporary index name (smart ALTER TABLE) */
		const char temp_index_suffix[]= "--temporary--";

		s = innobase_convert_identifier(buf, buflen, id + 1, idlen - 1,
						thd, FALSE);
		if (s - buf + (sizeof temp_index_suffix - 1) < buflen) {
			memcpy(s, temp_index_suffix,
			       sizeof temp_index_suffix - 1);
			s += sizeof temp_index_suffix - 1;
		}
	} else {
no_db_name:
		s = innobase_convert_identifier(buf, buflen, id, idlen,
						thd, table_id);
	}

	return(s);

}

/**********************************************************************//**
Determines if the currently running transaction has been interrupted.
@return	TRUE if interrupted */
extern "C" UNIV_INTERN
ibool
trx_is_interrupted(
/*===============*/
	trx_t*	trx)	/*!< in: transaction */
{
	return(trx && trx->mysql_thd && thd_killed((THD*) trx->mysql_thd));
}

/**************************************************************//**
Resets some fields of a prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */
static
void
reset_template(
/*===========*/
	row_prebuilt_t*	prebuilt)	/*!< in/out: prebuilt struct */
{
	prebuilt->keep_other_fields_on_keyread = 0;
	prebuilt->read_just_key = 0;
}

/*****************************************************************//**
Call this when you have opened a new table handle in HANDLER, before you
call index_read_idx() etc. Actually, we can let the cursor stay open even
over a transaction commit! Then you should call this before every operation,
fetch next etc. This function inits the necessary things even after a
transaction commit. */
UNIV_INTERN
void
ha_innobase::init_table_handle_for_HANDLER(void)
/*============================================*/
{
	/* If current thd does not yet have a trx struct, create one.
	If the current handle does not yet have a prebuilt struct, create
	one. Update the trx pointers in the prebuilt struct. Normally
	this operation is done in external_lock. */

	update_thd(ha_thd());

	/* Initialize the prebuilt struct much like it would be inited in
	external_lock */

	innobase_release_stat_resources(prebuilt->trx);

	/* If the transaction is not started yet, start it */

	trx_start_if_not_started(prebuilt->trx);

	/* Assign a read view if the transaction does not have it yet */

	trx_assign_read_view(prebuilt->trx);

	/* Set the MySQL flag to mark that there is an active transaction */

	if (prebuilt->trx->active_trans == 0) {

		innobase_register_trx_and_stmt(ht, user_thd);

		prebuilt->trx->active_trans = 1;
	}

	/* We did the necessary inits in this function, no need to repeat them
	in row_search_for_mysql */

	prebuilt->sql_stat_start = FALSE;

	/* We let HANDLER always to do the reads as consistent reads, even
	if the trx isolation level would have been specified as SERIALIZABLE */

	prebuilt->select_lock_type = LOCK_NONE;
	prebuilt->stored_select_lock_type = LOCK_NONE;

	/* Always fetch all columns in the index record */

	prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;

	/* We want always to fetch all columns in the whole row? Or do
	we???? */

	prebuilt->used_in_HANDLER = TRUE;
	reset_template(prebuilt);
}

/*********************************************************************//**
Opens an InnoDB database.
@return	0 on success, error code on failure */
static
int
innobase_init(
/*==========*/
	void	*p)	/*!< in: InnoDB handlerton */
{
	static char	current_dir[3];		/*!< Set if using current lib */
	int		err;
	bool		ret;
	char		*default_path;
	uint		format_id;

	DBUG_ENTER("innobase_init");
        handlerton *innobase_hton= (handlerton *)p;
        innodb_hton_ptr = innobase_hton;

        innobase_hton->state = SHOW_OPTION_YES;
        innobase_hton->db_type= DB_TYPE_INNODB;
        innobase_hton->savepoint_offset=sizeof(trx_named_savept_t);
        innobase_hton->close_connection=innobase_close_connection;
        innobase_hton->savepoint_set=innobase_savepoint;
        innobase_hton->savepoint_rollback=innobase_rollback_to_savepoint;
        innobase_hton->savepoint_release=innobase_release_savepoint;
        innobase_hton->commit=innobase_commit;
        innobase_hton->rollback=innobase_rollback;
        innobase_hton->prepare=innobase_xa_prepare;
        innobase_hton->recover=innobase_xa_recover;
        innobase_hton->commit_by_xid=innobase_commit_by_xid;
        innobase_hton->rollback_by_xid=innobase_rollback_by_xid;
        innobase_hton->create_cursor_read_view=innobase_create_cursor_view;
        innobase_hton->set_cursor_read_view=innobase_set_cursor_view;
        innobase_hton->close_cursor_read_view=innobase_close_cursor_view;
        innobase_hton->create=innobase_create_handler;
        innobase_hton->drop_database=innobase_drop_database;
        innobase_hton->panic=innobase_end;
        innobase_hton->start_consistent_snapshot=innobase_start_trx_and_assign_read_view;
        innobase_hton->flush_logs=innobase_flush_logs;
        innobase_hton->show_status=innobase_show_status;
        innobase_hton->flags=HTON_NO_FLAGS;
        innobase_hton->release_temporary_latches=innobase_release_temporary_latches;
	innobase_hton->alter_table_flags = innobase_alter_table_flags;

	ut_a(DATA_MYSQL_TRUE_VARCHAR == (ulint)MYSQL_TYPE_VARCHAR);

#ifdef UNIV_DEBUG
	static const char	test_filename[] = "-@";
	char			test_tablename[sizeof test_filename
				+ sizeof srv_mysql50_table_name_prefix];
	if ((sizeof test_tablename) - 1
			!= filename_to_tablename(test_filename, test_tablename,
			sizeof test_tablename)
			|| strncmp(test_tablename,
			srv_mysql50_table_name_prefix,
			sizeof srv_mysql50_table_name_prefix)
			|| strcmp(test_tablename
			+ sizeof srv_mysql50_table_name_prefix,
			test_filename)) {
		sql_print_error("tablename encoding has been changed");
		goto error;
	}
#endif /* UNIV_DEBUG */

	/* Check that values don't overflow on 32-bit systems. */
	if (sizeof(ulint) == 4) {
		if (innobase_buffer_pool_size > UINT_MAX32) {
			sql_print_error(
				"innobase_buffer_pool_size can't be over 4GB"
				" on 32-bit systems");

			goto error;
		}

		if (innobase_log_file_size > UINT_MAX32) {
			sql_print_error(
				"innobase_log_file_size can't be over 4GB"
				" on 32-bit systems");

			goto error;
		}
	}

	os_innodb_umask = (ulint)my_umask;

	/* First calculate the default path for innodb_data_home_dir etc.,
	in case the user has not given any value.

	Note that when using the embedded server, the datadirectory is not
	necessarily the current directory of this program. */

	if (mysqld_embedded) {
		default_path = mysql_real_data_home;
		fil_path_to_mysql_datadir = mysql_real_data_home;
	} else {
		/* It's better to use current lib, to keep paths short */
		current_dir[0] = FN_CURLIB;
		current_dir[1] = FN_LIBCHAR;
		current_dir[2] = 0;
		default_path = current_dir;
	}

	ut_a(default_path);

	if (specialflag & SPECIAL_NO_PRIOR) {
		srv_set_thread_priorities = FALSE;
	} else {
		srv_set_thread_priorities = TRUE;
		srv_query_thread_priority = QUERY_PRIOR;
	}

	/* Set InnoDB initialization parameters according to the values
	read from MySQL .cnf file */

	/*--------------- Data files -------------------------*/

	/* The default dir for data files is the datadir of MySQL */

	srv_data_home = (innobase_data_home_dir ? innobase_data_home_dir :
			 default_path);

	/* Set default InnoDB data file size to 10 MB and let it be
	auto-extending. Thus users can use InnoDB in >= 4.0 without having
	to specify any startup options. */

	if (!innobase_data_file_path) {
		innobase_data_file_path = (char*) "ibdata1:10M:autoextend";
	}

	/* Since InnoDB edits the argument in the next call, we make another
	copy of it: */

	internal_innobase_data_file_path = my_strdup(innobase_data_file_path,
						   MYF(MY_FAE));

	ret = (bool) srv_parse_data_file_paths_and_sizes(
		internal_innobase_data_file_path);
	if (ret == FALSE) {
		sql_print_error(
			"InnoDB: syntax error in innodb_data_file_path");
mem_free_and_error:
		srv_free_paths_and_sizes();
		my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
		goto error;
	}

	/* -------------- Log files ---------------------------*/

	/* The default dir for log files is the datadir of MySQL */

	if (!innobase_log_group_home_dir) {
		innobase_log_group_home_dir = default_path;
	}

#ifdef UNIV_LOG_ARCHIVE
	/* Since innodb_log_arch_dir has no relevance under MySQL,
	starting from 4.0.6 we always set it the same as
	innodb_log_group_home_dir: */

	innobase_log_arch_dir = innobase_log_group_home_dir;

	srv_arch_dir = innobase_log_arch_dir;
#endif /* UNIG_LOG_ARCHIVE */

	ret = (bool)
		srv_parse_log_group_home_dirs(innobase_log_group_home_dir);

	if (ret == FALSE || innobase_mirrored_log_groups != 1) {
	  sql_print_error("syntax error in innodb_log_group_home_dir, or a "
			  "wrong number of mirrored log groups");

		goto mem_free_and_error;
	}

	/* Validate the file format by animal name */
	if (innobase_file_format_name != NULL) {

		format_id = innobase_file_format_name_lookup(
			innobase_file_format_name);

		if (format_id > DICT_TF_FORMAT_MAX) {

			sql_print_error("InnoDB: wrong innodb_file_format.");

			goto mem_free_and_error;
		}
	} else {
		/* Set it to the default file format id. Though this
		should never happen. */
		format_id = 0;
	}

	srv_file_format = format_id;

	/* Given the type of innobase_file_format_name we have little
	choice but to cast away the constness from the returned name.
	innobase_file_format_name is used in the MySQL set variable
	interface and so can't be const. */

	innobase_file_format_name = 
		(char*) trx_sys_file_format_id_to_name(format_id);

	/* Process innobase_file_format_check variable */
	ut_a(innobase_file_format_check != NULL);

	/* As a side effect it will set srv_check_file_format_at_startup
	on valid input. First we check for "on"/"off". */
	if (!innobase_file_format_check_on_off(innobase_file_format_check)) {

		/* Did the user specify a format name that we support ?
		As a side effect it will update the variable
		srv_check_file_format_at_startup */
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		if (innobase_file_format_validate_and_set(
				innobase_file_format_check) < 0) {
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			sql_print_error("InnoDB: invalid "
					"innodb_file_format_check value: "
					"should be either 'on' or 'off' or "
					"any value up to %s or its "
					"equivalent numeric id",
					trx_sys_file_format_id_to_name(
						DICT_TF_FORMAT_MAX));

			goto mem_free_and_error;
		}
	}

	if (innobase_change_buffering) {
		ulint	use;

		for (use = 0;
		     use < UT_ARR_SIZE(innobase_change_buffering_values);
		     use++) {
			if (!innobase_strcasecmp(
				    innobase_change_buffering,
				    innobase_change_buffering_values[use])) {
				ibuf_use = (ibuf_use_t) use;
				goto innobase_change_buffering_inited_ok;
			}
		}

		sql_print_error("InnoDB: invalid value "
				"innodb_file_format_check=%s",
				innobase_change_buffering);
		goto mem_free_and_error;
	}

innobase_change_buffering_inited_ok:
	ut_a((ulint) ibuf_use < UT_ARR_SIZE(innobase_change_buffering_values));
	innobase_change_buffering = (char*)
		innobase_change_buffering_values[ibuf_use];

	/* --------------------------------------------------*/

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	srv_file_flush_method_str = innobase_file_flush_method;
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	srv_n_log_groups = (ulint) innobase_mirrored_log_groups;
	srv_n_log_files = (ulint) innobase_log_files_in_group;
	srv_log_file_size = (ulint) innobase_log_file_size;

#ifdef UNIV_LOG_ARCHIVE
	srv_log_archive_on = (ulint) innobase_log_archive;
#endif /* UNIV_LOG_ARCHIVE */
	srv_log_buffer_size = (ulint) innobase_log_buffer_size;

	srv_buf_pool_size = (ulint) innobase_buffer_pool_size;

	srv_mem_pool_size = (ulint) innobase_additional_mem_pool_size;

	srv_n_file_io_threads = (ulint) innobase_file_io_threads;
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	srv_n_read_io_threads = (ulint) innobase_read_io_threads;
	srv_n_write_io_threads = (ulint) innobase_write_io_threads;
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	srv_force_recovery = (ulint) innobase_force_recovery;

	srv_use_doublewrite_buf = (ibool) innobase_use_doublewrite;
	srv_use_checksums = (ibool) innobase_use_checksums;

#ifdef HAVE_LARGE_PAGES
        if ((os_use_large_pages = (ibool) my_use_large_pages))
		os_large_page_size = (ulint) opt_large_page_size;
#endif

	row_rollback_on_timeout = (ibool) innobase_rollback_on_timeout;

	srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;

	srv_max_n_open_files = (ulint) innobase_open_files;
	srv_innodb_status = (ibool) innobase_create_status_file;

	srv_print_verbose_log = mysqld_embedded ? 0 : 1;

	/* Store the default charset-collation number of this MySQL
	installation */

	data_mysql_default_charset_coll = (ulint)default_charset_info->number;

	ut_a(DATA_MYSQL_LATIN1_SWEDISH_CHARSET_COLL ==
					my_charset_latin1.number);
	ut_a(DATA_MYSQL_BINARY_CHARSET_COLL == my_charset_bin.number);

	/* Store the latin1_swedish_ci character ordering table to InnoDB. For
	non-latin1_swedish_ci charsets we use the MySQL comparison functions,
	and consequently we do not need to know the ordering internally in
	InnoDB. */

	ut_a(0 == strcmp(my_charset_latin1.name, "latin1_swedish_ci"));
	srv_latin1_ordering = my_charset_latin1.sort_order;

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	innobase_old_blocks_pct = buf_LRU_old_ratio_update(
		innobase_old_blocks_pct, FALSE);

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	innobase_commit_concurrency_init_default();

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	/* Since we in this module access directly the fields of a trx
	struct, and due to different headers and flags it might happen that
	mutex_t has a different size in this module and in InnoDB
	modules, we check at run time that the size is the same in
	these compilation modules. */

	err = innobase_start_or_create_for_mysql();

	if (err != DB_SUCCESS) {
		goto mem_free_and_error;
	}

	innobase_open_tables = hash_create(200);
	pthread_mutex_init(&innobase_share_mutex, MY_MUTEX_INIT_FAST);
	pthread_mutex_init(&prepare_commit_mutex, MY_MUTEX_INIT_FAST);
	pthread_mutex_init(&commit_threads_m, MY_MUTEX_INIT_FAST);
	pthread_mutex_init(&commit_cond_m, MY_MUTEX_INIT_FAST);
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	pthread_mutex_init(&analyze_mutex, MY_MUTEX_INIT_FAST);
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	pthread_cond_init(&commit_cond, NULL);
	innodb_inited= 1;
#ifdef MYSQL_DYNAMIC_PLUGIN
	if (innobase_hton != p) {
		innobase_hton = reinterpret_cast<handlerton*>(p);
		*innobase_hton = *innodb_hton_ptr;
	}
#endif /* MYSQL_DYNAMIC_PLUGIN */

	/* Get the current high water mark format. */
	innobase_file_format_check = (char*) trx_sys_file_format_max_get();

	DBUG_RETURN(FALSE);
error:
	DBUG_RETURN(TRUE);
}

/*******************************************************************//**
Closes an InnoDB database.
@return	TRUE if error */
static
int
innobase_end(
/*=========*/
	handlerton*		hton,	/*!< in/out: InnoDB handlerton */
	ha_panic_function	type __attribute__((unused)))
					/*!< in: ha_panic() parameter */
{
	int	err= 0;

	DBUG_ENTER("innobase_end");
	DBUG_ASSERT(hton == innodb_hton_ptr);

#ifdef __NETWARE__	/* some special cleanup for NetWare */
	if (nw_panic) {
		set_panic_flag_for_netware();
	}
#endif
	if (innodb_inited) {

		srv_fast_shutdown = (ulint) innobase_fast_shutdown;
		innodb_inited = 0;
		hash_table_free(innobase_open_tables);
		innobase_open_tables = NULL;
		if (innobase_shutdown_for_mysql() != DB_SUCCESS) {
			err = 1;
		}
		srv_free_paths_and_sizes();
		my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
		pthread_mutex_destroy(&innobase_share_mutex);
		pthread_mutex_destroy(&prepare_commit_mutex);
		pthread_mutex_destroy(&commit_threads_m);
		pthread_mutex_destroy(&commit_cond_m);
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		pthread_mutex_destroy(&analyze_mutex);
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		pthread_cond_destroy(&commit_cond);
	}

	DBUG_RETURN(err);
}

/****************************************************************//**
Flushes InnoDB logs to disk and makes a checkpoint. Really, a commit flushes
the logs, and the name of this function should be innobase_checkpoint.
@return	TRUE if error */
static
bool
innobase_flush_logs(
/*================*/
	handlerton*	hton)	/*!< in/out: InnoDB handlerton */
{
	bool	result = 0;

	DBUG_ENTER("innobase_flush_logs");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	log_buffer_flush_to_disk();

	DBUG_RETURN(result);
}

/****************************************************************//**
Return alter table flags supported in an InnoDB database. */
static
uint
innobase_alter_table_flags(
/*=======================*/
	uint	flags)
{
	return(HA_ONLINE_ADD_INDEX_NO_WRITES
		| HA_ONLINE_DROP_INDEX_NO_WRITES
		| HA_ONLINE_ADD_UNIQUE_INDEX_NO_WRITES
		| HA_ONLINE_DROP_UNIQUE_INDEX_NO_WRITES
		| HA_ONLINE_ADD_PK_INDEX_NO_WRITES);
}

/*****************************************************************//**
Commits a transaction in an InnoDB database. */
static
void
innobase_commit_low(
/*================*/
	trx_t*	trx)	/*!< in: transaction handle */
{
	if (trx->conc_state == TRX_NOT_STARTED) {

		return;
	}

	trx_commit_for_mysql(trx);
}

/*****************************************************************//**
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
assigns a new snapshot for a consistent read if the transaction does not yet
have one.
@return	0 */
static
int
innobase_start_trx_and_assign_read_view(
/*====================================*/
        handlerton *hton, /*!< in: Innodb handlerton */ 
	THD*	thd)	/*!< in: MySQL thread handle of the user for whom
			the transaction should be committed */
{
	trx_t*	trx;

	DBUG_ENTER("innobase_start_trx_and_assign_read_view");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* Create a new trx struct for thd, if it does not yet have one */

	trx = check_trx_exists(thd);

	/* This is just to play safe: release a possible FIFO ticket and
	search latch. Since we will reserve the kernel mutex, we have to
	release the search system latch first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* If the transaction is not started yet, start it */

	trx_start_if_not_started(trx);

	/* Assign a read view if the transaction does not have it yet */

	trx_assign_read_view(trx);

	/* Set the MySQL flag to mark that there is an active transaction */

	if (trx->active_trans == 0) {
		innobase_register_trx_and_stmt(hton, thd);
		trx->active_trans = 1;
	}

	DBUG_RETURN(0);
}

/*****************************************************************//**
Commits a transaction in an InnoDB database or marks an SQL statement
ended.
@return	0 */
static
int
innobase_commit(
/*============*/
        handlerton *hton, /*!< in: Innodb handlerton */ 
	THD* 	thd,	/*!< in: MySQL thread handle of the user for whom
			the transaction should be committed */
	bool	all)	/*!< in:	TRUE - commit transaction
				FALSE - the current SQL statement ended */
{
	trx_t*		trx;

	DBUG_ENTER("innobase_commit");
	DBUG_ASSERT(hton == innodb_hton_ptr);
	DBUG_PRINT("trans", ("ending transaction"));

	trx = check_trx_exists(thd);

	/* Since we will reserve the kernel mutex, we have to release
	the search system latch first to obey the latching order. */

	if (trx->has_search_latch) {
		trx_search_latch_release_if_reserved(trx);
	}

	/* The flag trx->active_trans is set to 1 in

	1. ::external_lock(),
	2. ::start_stmt(),
	3. innobase_query_caching_of_table_permitted(),
	4. innobase_savepoint(),
	5. ::init_table_handle_for_HANDLER(),
	6. innobase_start_trx_and_assign_read_view(),
	7. ::transactional_table_lock()

	and it is only set to 0 in a commit or a rollback. If it is 0 we know
	there cannot be resources to be freed and we could return immediately.
	For the time being, we play safe and do the cleanup though there should
	be nothing to clean up. */

	if (trx->active_trans == 0
		&& trx->conc_state != TRX_NOT_STARTED) {

		sql_print_error("trx->active_trans == 0, but"
			" trx->conc_state != TRX_NOT_STARTED");
	}
	if (all
		|| (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		/* We were instructed to commit the whole transaction, or
		this is an SQL statement end and autocommit is on */

		/* We need current binlog position for ibbackup to work.
		Note, the position is current because of
		prepare_commit_mutex */
retry:
		if (innobase_commit_concurrency > 0) {
			pthread_mutex_lock(&commit_cond_m);
			commit_threads++;

			if (commit_threads > innobase_commit_concurrency) {
				commit_threads--;
				pthread_cond_wait(&commit_cond,
					&commit_cond_m);
				pthread_mutex_unlock(&commit_cond_m);
				goto retry;
			}
			else {
				pthread_mutex_unlock(&commit_cond_m);
			}
		}

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		/* The following calls to read the MySQL binary log
		file name and the position return consistent results:
		1) Other InnoDB transactions cannot intervene between
		these calls as we are holding prepare_commit_mutex.
		2) Binary logging of other engines is not relevant
		to InnoDB as all InnoDB requires is that committing
		InnoDB transactions appear in the same order in the
		MySQL binary log as they appear in InnoDB logs.
		3) A MySQL log file rotation cannot happen because
		MySQL protects against this by having a counter of
		transactions in prepared state and it only allows
		a rotation when the counter drops to zero. See
		LOCK_prep_xids and COND_prep_xids in log.cc. */
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		trx->mysql_log_file_name = mysql_bin_log_file_name();
		trx->mysql_log_offset = (ib_int64_t) mysql_bin_log_file_pos();

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		/* Don't do write + flush right now. For group commit
		to work we want to do the flush after releasing the
		prepare_commit_mutex. */
		trx->flush_log_later = TRUE;
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		innobase_commit_low(trx);
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		trx->flush_log_later = FALSE;
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		if (innobase_commit_concurrency > 0) {
			pthread_mutex_lock(&commit_cond_m);
			commit_threads--;
			pthread_cond_signal(&commit_cond);
			pthread_mutex_unlock(&commit_cond_m);
		}

		if (trx->active_trans == 2) {

			pthread_mutex_unlock(&prepare_commit_mutex);
		}

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		/* Now do a write + flush of logs. */
		trx_commit_complete_for_mysql(trx);
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		trx->active_trans = 0;

	} else {
		/* We just mark the SQL statement ended and do not do a
		transaction commit */

		/* If we had reserved the auto-inc lock for some
		table in this SQL statement we release it now */

		row_unlock_table_autoinc_for_mysql(trx);

		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
	}

	trx->n_autoinc_rows = 0; /* Reset the number AUTO-INC rows required */

	if (trx->declared_to_be_inside_innodb) {
		/* Release our possible ticket in the FIFO */

		srv_conc_force_exit_innodb(trx);
	}

	/* Tell the InnoDB server that there might be work for utility
	threads: */
	srv_active_wake_master_thread();

	DBUG_RETURN(0);
}

/*****************************************************************//**
Rolls back a transaction or the latest SQL statement.
@return	0 or error number */
static
int
innobase_rollback(
/*==============*/
        handlerton *hton, /*!< in: Innodb handlerton */ 
	THD*	thd,	/*!< in: handle to the MySQL thread of the user
			whose transaction should be rolled back */
	bool	all)	/*!< in:	TRUE - commit transaction
				FALSE - the current SQL statement ended */
{
	int	error = 0;
	trx_t*	trx;

	DBUG_ENTER("innobase_rollback");
	DBUG_ASSERT(hton == innodb_hton_ptr);
	DBUG_PRINT("trans", ("aborting transaction"));

	trx = check_trx_exists(thd);

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

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	trx->n_autoinc_rows = 0; /* Reset the number AUTO-INC rows required */

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	/* If we had reserved the auto-inc lock for some table (if
	we come here to roll back the latest SQL statement) we
	release it now before a possibly lengthy rollback */

	row_unlock_table_autoinc_for_mysql(trx);

	if (all
		|| !thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

		error = trx_rollback_for_mysql(trx);
		trx->active_trans = 0;
	} else {
		error = trx_rollback_last_sql_stat_for_mysql(trx);
	}

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Rolls back a transaction
@return	0 or error number */
static
int
innobase_rollback_trx(
/*==================*/
	trx_t*	trx)	/*!< in: transaction */
{
	int	error = 0;

	DBUG_ENTER("innobase_rollback_trx");
	DBUG_PRINT("trans", ("aborting transaction"));

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* If we had reserved the auto-inc lock for some table (if
	we come here to roll back the latest SQL statement) we
	release it now before a possibly lengthy rollback */

	row_unlock_table_autoinc_for_mysql(trx);

	error = trx_rollback_for_mysql(trx);

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Rolls back a transaction to a savepoint.
@return 0 if success, HA_ERR_NO_SAVEPOINT if no savepoint with the
given name */
static
int
innobase_rollback_to_savepoint(
/*===========================*/
        handlerton *hton,       /*!< in: Innodb handlerton */ 
	THD*	thd,		/*!< in: handle to the MySQL thread of the user
				whose transaction should be rolled back */
	void*	savepoint)	/*!< in: savepoint data */
{
	ib_int64_t	mysql_binlog_cache_pos;
	int		error = 0;
	trx_t*		trx;
	char		name[64];

	DBUG_ENTER("innobase_rollback_to_savepoint");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx = check_trx_exists(thd);

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* TODO: use provided savepoint data area to store savepoint data */

	longlong2str((ulint)savepoint, name, 36);

	error = (int) trx_rollback_to_savepoint_for_mysql(trx, name,
						&mysql_binlog_cache_pos);
	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Release transaction savepoint name.
@return 0 if success, HA_ERR_NO_SAVEPOINT if no savepoint with the
given name */
static
int
innobase_release_savepoint(
/*=======================*/
        handlerton*	hton,	/*!< in: handlerton for Innodb */
	THD*	thd,		/*!< in: handle to the MySQL thread of the user
				whose transaction should be rolled back */
	void*	savepoint)	/*!< in: savepoint data */
{
	int		error = 0;
	trx_t*		trx;
	char		name[64];

	DBUG_ENTER("innobase_release_savepoint");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx = check_trx_exists(thd);

	/* TODO: use provided savepoint data area to store savepoint data */

	longlong2str((ulint)savepoint, name, 36);

	error = (int) trx_release_savepoint_for_mysql(trx, name);

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Sets a transaction savepoint.
@return	always 0, that is, always succeeds */
static
int
innobase_savepoint(
/*===============*/
	handlerton*	hton,   /*!< in: handle to the Innodb handlerton */
	THD*	thd,		/*!< in: handle to the MySQL thread */
	void*	savepoint)	/*!< in: savepoint data */
{
	int	error = 0;
	trx_t*	trx;

	DBUG_ENTER("innobase_savepoint");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	/*
	  In the autocommit mode there is no sense to set a savepoint
	  (unless we are in sub-statement), so SQL layer ensures that
	  this method is never called in such situation.
	*/
#ifdef MYSQL_SERVER /* plugins cannot access thd->in_sub_stmt */
	DBUG_ASSERT(thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
		thd->in_sub_stmt);
#endif /* MYSQL_SERVER */

	trx = check_trx_exists(thd);

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* cannot happen outside of transaction */
	DBUG_ASSERT(trx->active_trans);

	/* TODO: use provided savepoint data area to store savepoint data */
	char name[64];
	longlong2str((ulint)savepoint,name,36);

	error = (int) trx_savepoint_for_mysql(trx, name, (ib_int64_t)0);

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Frees a possible InnoDB trx object associated with the current THD.
@return	0 or error number */
static
int
innobase_close_connection(
/*======================*/
        handlerton*	hton,	/*!< in:  innobase handlerton */
	THD*	thd)	/*!< in: handle to the MySQL thread of the user
			whose resources should be free'd */
{
	trx_t*	trx;

	DBUG_ENTER("innobase_close_connection");
	DBUG_ASSERT(hton == innodb_hton_ptr);
	trx = thd_to_trx(thd);

	ut_a(trx);

	if (trx->active_trans == 0
		&& trx->conc_state != TRX_NOT_STARTED) {

		sql_print_error("trx->active_trans == 0, but"
			" trx->conc_state != TRX_NOT_STARTED");
	}


	if (trx->conc_state != TRX_NOT_STARTED &&
		global_system_variables.log_warnings) {
		sql_print_warning(
			"MySQL is closing a connection that has an active "
			"InnoDB transaction.  %lu row modifications will "
			"roll back.",
			(ulong) trx->undo_no.low);
	}

	innobase_rollback_trx(trx);

	thr_local_free(trx->mysql_thread_id);
	trx_free_for_mysql(trx);

	DBUG_RETURN(0);
}


/*************************************************************************//**
** InnoDB database tables
*****************************************************************************/

/****************************************************************//**
Get the record format from the data dictionary.
@return one of ROW_TYPE_REDUNDANT, ROW_TYPE_COMPACT,
ROW_TYPE_COMPRESSED, ROW_TYPE_DYNAMIC */
UNIV_INTERN
enum row_type
ha_innobase::get_row_type() const
/*=============================*/
{
	if (prebuilt && prebuilt->table) {
		const ulint	flags = prebuilt->table->flags;

		if (UNIV_UNLIKELY(!flags)) {
			return(ROW_TYPE_REDUNDANT);
		}

		ut_ad(flags & DICT_TF_COMPACT);

		switch (flags & DICT_TF_FORMAT_MASK) {
		case DICT_TF_FORMAT_51 << DICT_TF_FORMAT_SHIFT:
			return(ROW_TYPE_COMPACT);
		case DICT_TF_FORMAT_ZIP << DICT_TF_FORMAT_SHIFT:
			if (flags & DICT_TF_ZSSIZE_MASK) {
				return(ROW_TYPE_COMPRESSED);
			} else {
				return(ROW_TYPE_DYNAMIC);
			}
#if DICT_TF_FORMAT_ZIP != DICT_TF_FORMAT_MAX
# error "DICT_TF_FORMAT_ZIP != DICT_TF_FORMAT_MAX"
#endif
		}
	}
	ut_ad(0);
	return(ROW_TYPE_NOT_USED);
}



/****************************************************************//**
Get the table flags to use for the statement.
@return	table flags */
UNIV_INTERN
handler::Table_flags
ha_innobase::table_flags() const
/*============================*/
{
       /* Need to use tx_isolation here since table flags is (also)
          called before prebuilt is inited. */
        ulong const tx_isolation = thd_tx_isolation(ha_thd());
        if (tx_isolation <= ISO_READ_COMMITTED)
                return int_table_flags;
        return int_table_flags | HA_BINLOG_STMT_CAPABLE;
}

/****************************************************************//**
Gives the file extension of an InnoDB single-table tablespace. */
static const char* ha_innobase_exts[] = {
  ".ibd",
  NullS
};

/****************************************************************//**
Returns the table type (storage engine name).
@return	table type */
UNIV_INTERN
const char*
ha_innobase::table_type() const
/*===========================*/
{
	return(innobase_hton_name);
}

/****************************************************************//**
Returns the index type. */
UNIV_INTERN
const char*
ha_innobase::index_type(
/*====================*/
	uint)
				/*!< out: index type */
{
	return("BTREE");
}

/****************************************************************//**
Returns the table file name extension.
@return	file extension string */
UNIV_INTERN
const char**
ha_innobase::bas_ext() const
/*========================*/
{
	return(ha_innobase_exts);
}

/****************************************************************//**
Returns the operations supported for indexes.
@return	flags of supported operations */
UNIV_INTERN
ulong
ha_innobase::index_flags(
/*=====================*/
	uint,
	uint,
	bool)
const
{
	return(HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER
	       | HA_READ_RANGE | HA_KEYREAD_ONLY);
}

/****************************************************************//**
Returns the maximum number of keys.
@return	MAX_KEY */
UNIV_INTERN
uint
ha_innobase::max_supported_keys() const
/*===================================*/
{
	return(MAX_KEY);
}

/****************************************************************//**
Returns the maximum key length.
@return	maximum supported key length, in bytes */
UNIV_INTERN
uint
ha_innobase::max_supported_key_length() const
/*=========================================*/
{
	/* An InnoDB page must store >= 2 keys; a secondary key record
	must also contain the primary key value: max key length is
	therefore set to slightly less than 1 / 4 of page size which
	is 16 kB; but currently MySQL does not work with keys whose
	size is > MAX_KEY_LENGTH */
	return(3500);
}

/****************************************************************//**
Returns the key map of keys that are usable for scanning.
@return	key_map_full */
UNIV_INTERN
const key_map*
ha_innobase::keys_to_use_for_scanning()
{
	return(&key_map_full);
}

/****************************************************************//**
Determines if table caching is supported.
@return	HA_CACHE_TBL_ASKTRANSACT */
UNIV_INTERN
uint8
ha_innobase::table_cache_type()
{
	return(HA_CACHE_TBL_ASKTRANSACT);
}

/****************************************************************//**
Determines if the primary key is clustered index.
@return	true */
UNIV_INTERN
bool
ha_innobase::primary_key_is_clustered()
{
	return(true);
}

/*****************************************************************//**
Normalizes a table name string. A normalized name consists of the
database name catenated to '/' and table name. An example:
test/mytable. On Windows normalization puts both the database name and the
table name always to lower case. */
static
void
normalize_table_name(
/*=================*/
	char*		norm_name,	/*!< out: normalized name as a
					null-terminated string */
	const char*	name)		/*!< in: table name string */
{
	char*	name_ptr;
	char*	db_ptr;
	char*	ptr;

	/* Scan name from the end */

	ptr = strend(name)-1;

	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	name_ptr = ptr + 1;

	DBUG_ASSERT(ptr > name);

	ptr--;

	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	db_ptr = ptr + 1;

	memcpy(norm_name, db_ptr, strlen(name) + 1 - (db_ptr - name));

	norm_name[name_ptr - db_ptr - 1] = '/';

#ifdef __WIN__
	innobase_casedn_str(norm_name);
#endif
}

/********************************************************************//**
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Get the upper limit of the MySQL integral and floating-point type.
@return maximum allowed value for the field */
static
ulonglong
innobase_get_int_col_max_value(
/*===========================*/
	const Field*	field)	/*!< in: MySQL field */
{
	ulonglong	max_value = 0;

	switch(field->key_type()) {
	/* TINY */
	case HA_KEYTYPE_BINARY:
		max_value = 0xFFULL;
		break;
	case HA_KEYTYPE_INT8:
		max_value = 0x7FULL;
		break;
	/* SHORT */
	case HA_KEYTYPE_USHORT_INT:
		max_value = 0xFFFFULL;
		break;
	case HA_KEYTYPE_SHORT_INT:
		max_value = 0x7FFFULL;
		break;
	/* MEDIUM */
	case HA_KEYTYPE_UINT24:
		max_value = 0xFFFFFFULL;
		break;
	case HA_KEYTYPE_INT24:
		max_value = 0x7FFFFFULL;
		break;
	/* LONG */
	case HA_KEYTYPE_ULONG_INT:
		max_value = 0xFFFFFFFFULL;
		break;
	case HA_KEYTYPE_LONG_INT:
		max_value = 0x7FFFFFFFULL;
		break;
	/* BIG */
	case HA_KEYTYPE_ULONGLONG:
		max_value = 0xFFFFFFFFFFFFFFFFULL;
		break;
	case HA_KEYTYPE_LONGLONG:
		max_value = 0x7FFFFFFFFFFFFFFFULL;
		break;
	case HA_KEYTYPE_FLOAT:
		/* We use the maximum as per IEEE754-2008 standard, 2^24 */
		max_value = 0x1000000ULL;
		break;
	case HA_KEYTYPE_DOUBLE:
		/* We use the maximum as per IEEE754-2008 standard, 2^53 */
		max_value = 0x20000000000000ULL;
		break;
	default:
		ut_error;
	}

	return(max_value);
}

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/*******************************************************************//**
This function checks whether the index column information
is consistent between KEY info from mysql and that from innodb index.
@return TRUE if all column types match. */
static
ibool
innobase_match_index_columns(
/*=========================*/
	const KEY*		key_info,	/*!< in: Index info
						from mysql */
	const dict_index_t*	index_info)	/*!< in: Index info
						from Innodb */
{
	const KEY_PART_INFO*	key_part;
	const KEY_PART_INFO*	key_end;
	const dict_field_t*	innodb_idx_fld;
	const dict_field_t*	innodb_idx_fld_end;

	DBUG_ENTER("innobase_match_index_columns");

	/* Check whether user defined index column count matches */
	if (key_info->key_parts != index_info->n_user_defined_cols) {
		DBUG_RETURN(FALSE);
	}

	key_part = key_info->key_part;
	key_end = key_part + key_info->key_parts;
	innodb_idx_fld = index_info->fields;
	innodb_idx_fld_end = index_info->fields + index_info->n_fields;

	/* Check each index column's datatype. We do not check
	column name because there exists case that index
	column name got modified in mysql but such change does not
	propagate to InnoDB.
	One hidden assumption here is that the index column sequences
	are matched up between those in mysql and Innodb. */
	for (; key_part != key_end; ++key_part) {
		ulint	col_type;
		ibool	is_unsigned;
		ulint	mtype = innodb_idx_fld->col->mtype;

		/* Need to translate to InnoDB column type before
		comparison. */
		col_type = get_innobase_type_from_mysql_type(&is_unsigned,
							     key_part->field);

		/* Ignore Innodb specific system columns. */
		while (mtype == DATA_SYS) {
			innodb_idx_fld++;

			if (innodb_idx_fld >= innodb_idx_fld_end) {
				DBUG_RETURN(FALSE);
			}
		}

		if (col_type != mtype) {
			/* Column Type mismatches */
			DBUG_RETURN(FALSE);
		}

		innodb_idx_fld++;
	}

	DBUG_RETURN(TRUE);
}

/*******************************************************************//**
This function builds a translation table in INNOBASE_SHARE
structure for fast index location with mysql array number from its
table->key_info structure. This also provides the necessary translation
between the key order in mysql key_info and Innodb ib_table->indexes if
they are not fully matched with each other.
Note we do not have any mutex protecting the translation table
building based on the assumption that there is no concurrent
index creation/drop and DMLs that requires index lookup. All table
handle will be closed before the index creation/drop.
@return TRUE if index translation table built successfully */
static
ibool
innobase_build_index_translation(
/*=============================*/
	const TABLE*		table,	  /*!< in: table in MySQL data
					  dictionary */
	dict_table_t*		ib_table, /*!< in: table in Innodb data
					  dictionary */
	INNOBASE_SHARE*		share)	  /*!< in/out: share structure
					  where index translation table
					  will be constructed in. */
{
	ulint		mysql_num_index;
	ulint		ib_num_index;
	dict_index_t**	index_mapping;
	ibool		ret = TRUE;

	DBUG_ENTER("innobase_build_index_translation");

	mysql_num_index = table->s->keys;
	ib_num_index = UT_LIST_GET_LEN(ib_table->indexes);

	/* Innodb could have own system indexes. */
	ut_a(ib_num_index >= mysql_num_index);

	index_mapping = share->idx_trans_tbl.index_mapping;

	/* If index entry count is non-zero, nothing has
	changed since last update, directly return TRUE */
	if (share->idx_trans_tbl.index_count) {
		/* Index entry count should still match mysql_num_index */
		ut_a(share->idx_trans_tbl.index_count == mysql_num_index);
		goto func_exit;
	}

	/* The number of index increased, rebuild the mapping table */
	if (mysql_num_index > share->idx_trans_tbl.array_size) {
		index_mapping = (dict_index_t**) my_realloc(index_mapping,
							mysql_num_index *
							sizeof(*index_mapping),
							MYF(MY_ALLOW_ZERO_PTR));

		if (!index_mapping) {
			ret = FALSE;
			goto func_exit;
		}

		share->idx_trans_tbl.array_size = mysql_num_index;
	}


	/* For each index in the mysql key_info array, fetch its
	corresponding InnoDB index pointer into index_mapping
	array. */
	for (ulint count = 0; count < mysql_num_index; count++) {

		/* Fetch index pointers into index_mapping according to mysql
		index sequence */
		index_mapping[count] = dict_table_get_index_on_name(
			ib_table, table->key_info[count].name);

		if (!index_mapping[count]) {
			sql_print_error("Cannot find index %s in InnoDB "
					"index dictionary.",
					table->key_info[count].name);
			ret = FALSE;
			goto func_exit;
		}

		/* Double check fetched index has the same
		column info as those in mysql key_info. */
		if (!innobase_match_index_columns(&table->key_info[count],
					          index_mapping[count])) {
			sql_print_error("Found index %s whose column info "
					"does not match that of MySQL.",
					table->key_info[count].name);
			ret = FALSE;
			goto func_exit;
		}
	}

	/* Successfully built the translation table */
	share->idx_trans_tbl.index_count = mysql_num_index;

func_exit:
	if (!ret) {
		/* Build translation table failed. */
		my_free(index_mapping, MYF(MY_ALLOW_ZERO_PTR));

		share->idx_trans_tbl.array_size = 0;
		share->idx_trans_tbl.index_count = 0;
		index_mapping = NULL;
	}

	share->idx_trans_tbl.index_mapping = index_mapping;

	DBUG_RETURN(ret);
}

/*******************************************************************//**
This function uses index translation table to quickly locate the
requested index structure.
Note we do not have mutex protection for the index translatoin table
access, it is based on the assumption that there is no concurrent
translation table rebuild (fter create/drop index) and DMLs that
require index lookup.
@return dict_index_t structure for requested index. NULL if
fail to locate the index structure. */
static
dict_index_t*
innobase_index_lookup(
/*==================*/
	INNOBASE_SHARE*	share,	/*!< in: share structure for index
				translation table. */
	uint		keynr)	/*!< in: index number for the requested
				index */
{
	if (!share->idx_trans_tbl.index_mapping
	    || keynr >= share->idx_trans_tbl.index_count) {
		return(NULL);
	}

	return(share->idx_trans_tbl.index_mapping[keynr]);
}

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/************************************************************************
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Set the autoinc column max value. This should only be called once from
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ha_innobase::open(). Therefore there's no need for a covering lock. */
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UNIV_INTERN
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void
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ha_innobase::innobase_initialize_autoinc()
/*======================================*/
{
	ulonglong	auto_inc;
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	const Field*	field = table->found_next_number_field;
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	if (field != NULL) {
		auto_inc = innobase_get_int_col_max_value(field);
	} else {
		/* We have no idea what's been passed in to us as the
		autoinc column. We set it to the MAX_INT of our table
		autoinc type. */
		auto_inc = 0xFFFFFFFFFFFFFFFFULL;
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		ut_print_timestamp(stderr);
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		fprintf(stderr, "  InnoDB: Unable to determine the AUTOINC "
				"column name\n");
	}
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	if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {
		/* If the recovery level is set so high that writes
		are disabled we force the AUTOINC counter to the MAX
		value effectively disabling writes to the table.
		Secondly, we avoid reading the table in case the read
		results in failure due to a corrupted table/index.

		We will not return an error to the client, so that the
		tables can be dumped with minimal hassle.  If an error
		were returned in this case, the first attempt to read
		the table would fail and subsequent SELECTs would succeed. */
	} else if (field == NULL) {
		my_error(ER_AUTOINC_READ_FAILED, MYF(0));
	} else {
		dict_index_t*	index;
		const char*	col_name;
		ulonglong	read_auto_inc;
		ulint		err;

		update_thd(ha_thd());
		col_name = field->field_name;
		index = innobase_get_index(table->s->next_number_index);

		/* Execute SELECT MAX(col_name) FROM TABLE; */
		err = row_search_max_autoinc(index, col_name, &read_auto_inc);

		switch (err) {
		case DB_SUCCESS:
			/* At the this stage we do not know the increment
			or the offset, so use a default increment of 1. */
			auto_inc = read_auto_inc + 1;
			break;

		case DB_RECORD_NOT_FOUND:
			ut_print_timestamp(stderr);
			fprintf(stderr, "  InnoDB: MySQL and InnoDB data "
				"dictionaries are out of sync.\n"
				"InnoDB: Unable to find the AUTOINC column "
				"%s in the InnoDB table %s.\n"
				"InnoDB: We set the next AUTOINC column "
				"value to the maximum possible value,\n"
				"InnoDB: in effect disabling the AUTOINC "
				"next value generation.\n"
				"InnoDB: You can either set the next "
				"AUTOINC value explicitly using ALTER TABLE\n"
				"InnoDB: or fix the data dictionary by "
				"recreating the table.\n",
				col_name, index->table->name);

			my_error(ER_AUTOINC_READ_FAILED, MYF(0));
			break;
		default:
			/* row_search_max_autoinc() should only return
			one of DB_SUCCESS or DB_RECORD_NOT_FOUND. */
			ut_error;
		}
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	}

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	dict_table_autoinc_initialize(prebuilt->table, auto_inc);
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}

/*****************************************************************//**
Creates and opens a handle to a table which already exists in an InnoDB
database.
@return	1 if error, 0 if success */
UNIV_INTERN
int
ha_innobase::open(
/*==============*/
	const char*	name,		/*!< in: table name */
	int		mode,		/*!< in: not used */
	uint		test_if_locked)	/*!< in: not used */
{
	dict_table_t*	ib_table;
	char		norm_name[1000];
	THD*		thd;
	ulint		retries = 0;
	char*		is_part = NULL;

	DBUG_ENTER("ha_innobase::open");

	UT_NOT_USED(mode);
	UT_NOT_USED(test_if_locked);

	thd = ha_thd();

	/* Under some cases MySQL seems to call this function while
	holding btr_search_latch. This breaks the latching order as
	we acquire dict_sys->mutex below and leads to a deadlock. */
	if (thd != NULL) {
		innobase_release_temporary_latches(ht, thd);
	}

	normalize_table_name(norm_name, name);

	user_thd = NULL;

	if (!(share=get_share(name))) {

		DBUG_RETURN(1);
	}

	/* Create buffers for packing the fields of a record. Why
	table->reclength did not work here? Obviously, because char
	fields when packed actually became 1 byte longer, when we also
	stored the string length as the first byte. */

	upd_and_key_val_buff_len =
				table->s->reclength + table->s->max_key_length
							+ MAX_REF_PARTS * 3;
	if (!(uchar*) my_multi_malloc(MYF(MY_WME),
			&upd_buff, upd_and_key_val_buff_len,
			&key_val_buff, upd_and_key_val_buff_len,
			NullS)) {
		free_share(share);

		DBUG_RETURN(1);
	}

	/* We look for pattern #P# to see if the table is partitioned
	MySQL table. The retry logic for partitioned tables is a
	workaround for http://bugs.mysql.com/bug.php?id=33349. Look
	at support issue https://support.mysql.com/view.php?id=21080
	for more details. */
	is_part = strstr(norm_name, "#P#");
retry:
	/* Get pointer to a table object in InnoDB dictionary cache */
	ib_table = dict_table_get(norm_name, TRUE);
	
	if (NULL == ib_table) {
		if (is_part && retries < 10) {
			++retries;
			os_thread_sleep(100000);
			goto retry;
		}

		if (is_part) {
			sql_print_error("Failed to open table %s after "
3434
					"%lu attempts.\n", norm_name,
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					retries);
		}

		sql_print_error("Cannot find or open table %s from\n"
				"the internal data dictionary of InnoDB "
				"though the .frm file for the\n"
				"table exists. Maybe you have deleted and "
				"recreated InnoDB data\n"
				"files but have forgotten to delete the "
				"corresponding .frm files\n"
				"of InnoDB tables, or you have moved .frm "
				"files to another database?\n"
				"or, the table contains indexes that this "
				"version of the engine\n"
				"doesn't support.\n"
				"See " REFMAN "innodb-troubleshooting.html\n"
				"how you can resolve the problem.\n",
				norm_name);
		free_share(share);
		my_free(upd_buff, MYF(0));
		my_errno = ENOENT;

		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
	}

	if (ib_table->ibd_file_missing && !thd_tablespace_op(thd)) {
		sql_print_error("MySQL is trying to open a table handle but "
				"the .ibd file for\ntable %s does not exist.\n"
				"Have you deleted the .ibd file from the "
				"database directory under\nthe MySQL datadir, "
				"or have you used DISCARD TABLESPACE?\n"
				"See " REFMAN "innodb-troubleshooting.html\n"
				"how you can resolve the problem.\n",
				norm_name);
		free_share(share);
		my_free(upd_buff, MYF(0));
		my_errno = ENOENT;

		dict_table_decrement_handle_count(ib_table, FALSE);
		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
	}

	prebuilt = row_create_prebuilt(ib_table);

	prebuilt->mysql_row_len = table->s->reclength;
	prebuilt->default_rec = table->s->default_values;
	ut_ad(prebuilt->default_rec);

	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */

	primary_key = table->s->primary_key;
	key_used_on_scan = primary_key;

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	if (!innobase_build_index_translation(table, ib_table, share)) {
		  sql_print_error("Build InnoDB index translation table for"
				  " Table %s failed", name);
	}

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	/* Allocate a buffer for a 'row reference'. A row reference is
	a string of bytes of length ref_length which uniquely specifies
	a row in our table. Note that MySQL may also compare two row
	references for equality by doing a simple memcmp on the strings
	of length ref_length! */

	if (!row_table_got_default_clust_index(ib_table)) {
		if (primary_key >= MAX_KEY) {
		  sql_print_error("Table %s has a primary key in InnoDB data "
				  "dictionary, but not in MySQL!", name);
		}

		prebuilt->clust_index_was_generated = FALSE;

		/* MySQL allocates the buffer for ref. key_info->key_length
		includes space for all key columns + one byte for each column
		that may be NULL. ref_length must be as exact as possible to
		save space, because all row reference buffers are allocated
		based on ref_length. */

		ref_length = table->key_info[primary_key].key_length;
	} else {
		if (primary_key != MAX_KEY) {
		  sql_print_error("Table %s has no primary key in InnoDB data "
				  "dictionary, but has one in MySQL! If you "
				  "created the table with a MySQL version < "
				  "3.23.54 and did not define a primary key, "
				  "but defined a unique key with all non-NULL "
				  "columns, then MySQL internally treats that "
				  "key as the primary key. You can fix this "
				  "error by dump + DROP + CREATE + reimport "
				  "of the table.", name);
		}

		prebuilt->clust_index_was_generated = TRUE;

		ref_length = DATA_ROW_ID_LEN;

		/* If we automatically created the clustered index, then
		MySQL does not know about it, and MySQL must NOT be aware
		of the index used on scan, to make it avoid checking if we
		update the column of the index. That is why we assert below
		that key_used_on_scan is the undefined value MAX_KEY.
		The column is the row id in the automatical generation case,
		and it will never be updated anyway. */

		if (key_used_on_scan != MAX_KEY) {
			sql_print_warning(
				"Table %s key_used_on_scan is %lu even "
				"though there is no primary key inside "
				"InnoDB.", name, (ulong) key_used_on_scan);
		}
	}

	/* Index block size in InnoDB: used by MySQL in query optimization */
	stats.block_size = 16 * 1024;

	/* Init table lock structure */
	thr_lock_data_init(&share->lock,&lock,(void*) 0);

	if (prebuilt->table) {
		/* We update the highest file format in the system table
		space, if this table has higher file format setting. */

		trx_sys_file_format_max_upgrade(
			(const char**) &innobase_file_format_check,
			dict_table_get_format(prebuilt->table));
	}

	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);

	/* Only if the table has an AUTOINC column. */
	if (prebuilt->table != NULL && table->found_next_number_field != NULL) {
		dict_table_autoinc_lock(prebuilt->table);

		/* Since a table can already be "open" in InnoDB's internal
		data dictionary, we only init the autoinc counter once, the
		first time the table is loaded. We can safely reuse the
		autoinc value from a previous MySQL open. */
		if (dict_table_autoinc_read(prebuilt->table) == 0) {

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			innobase_initialize_autoinc();
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		}

		dict_table_autoinc_unlock(prebuilt->table);
	}

	DBUG_RETURN(0);
}

UNIV_INTERN
uint
ha_innobase::max_supported_key_part_length() const
{
	return(DICT_MAX_INDEX_COL_LEN - 1);
}

/******************************************************************//**
Closes a handle to an InnoDB table.
@return	0 */
UNIV_INTERN
int
ha_innobase::close(void)
/*====================*/
{
	THD*	thd;

	DBUG_ENTER("ha_innobase::close");

	thd = ha_thd();
	if (thd != NULL) {
		innobase_release_temporary_latches(ht, thd);
	}

	row_prebuilt_free(prebuilt, FALSE);

	my_free(upd_buff, MYF(0));
	free_share(share);

	/* Tell InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

	DBUG_RETURN(0);
}

/* The following accessor functions should really be inside MySQL code! */

/**************************************************************//**
Gets field offset for a field in a table.
@return	offset */
static inline
uint
get_field_offset(
/*=============*/
	TABLE*	table,	/*!< in: MySQL table object */
	Field*	field)	/*!< in: MySQL field object */
{
	return((uint) (field->ptr - table->record[0]));
}

/**************************************************************//**
Checks if a field in a record is SQL NULL. Uses the record format
information in table to track the null bit in record.
@return	1 if NULL, 0 otherwise */
static inline
uint
field_in_record_is_null(
/*====================*/
	TABLE*	table,	/*!< in: MySQL table object */
	Field*	field,	/*!< in: MySQL field object */
	char*	record)	/*!< in: a row in MySQL format */
{
	int	null_offset;

	if (!field->null_ptr) {

		return(0);
	}

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	if (record[null_offset] & field->null_bit) {

		return(1);
	}

	return(0);
}

/**************************************************************//**
Sets a field in a record to SQL NULL. Uses the record format
information in table to track the null bit in record. */
static inline
void
set_field_in_record_to_null(
/*========================*/
	TABLE*	table,	/*!< in: MySQL table object */
	Field*	field,	/*!< in: MySQL field object */
	char*	record)	/*!< in: a row in MySQL format */
{
	int	null_offset;

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	record[null_offset] = record[null_offset] | field->null_bit;
}

/*************************************************************//**
InnoDB uses this function to compare two data fields for which the data type
is such that we must use MySQL code to compare them. NOTE that the prototype
of this function is in rem0cmp.c in InnoDB source code! If you change this
function, remember to update the prototype there!
@return	1, 0, -1, if a is greater, equal, less than b, respectively */
extern "C" UNIV_INTERN
int
innobase_mysql_cmp(
/*===============*/
	int		mysql_type,	/*!< in: MySQL type */
	uint		charset_number,	/*!< in: number of the charset */
	const unsigned char* a,		/*!< in: data field */
	unsigned int	a_length,	/*!< in: data field length,
					not UNIV_SQL_NULL */
	const unsigned char* b,		/*!< in: data field */
	unsigned int	b_length)	/*!< in: data field length,
					not UNIV_SQL_NULL */
{
	CHARSET_INFO*		charset;
	enum_field_types	mysql_tp;
	int			ret;

	DBUG_ASSERT(a_length != UNIV_SQL_NULL);
	DBUG_ASSERT(b_length != UNIV_SQL_NULL);

	mysql_tp = (enum_field_types) mysql_type;

	switch (mysql_tp) {

	case MYSQL_TYPE_BIT:
	case MYSQL_TYPE_STRING:
	case MYSQL_TYPE_VAR_STRING:
	case MYSQL_TYPE_TINY_BLOB:
	case MYSQL_TYPE_MEDIUM_BLOB:
	case MYSQL_TYPE_BLOB:
	case MYSQL_TYPE_LONG_BLOB:
	case MYSQL_TYPE_VARCHAR:
		/* Use the charset number to pick the right charset struct for
		the comparison. Since the MySQL function get_charset may be
		slow before Bar removes the mutex operation there, we first
		look at 2 common charsets directly. */

		if (charset_number == default_charset_info->number) {
			charset = default_charset_info;
		} else if (charset_number == my_charset_latin1.number) {
			charset = &my_charset_latin1;
		} else {
			charset = get_charset(charset_number, MYF(MY_WME));

			if (charset == NULL) {
			  sql_print_error("InnoDB needs charset %lu for doing "
					  "a comparison, but MySQL cannot "
					  "find that charset.",
					  (ulong) charset_number);
				ut_a(0);
			}
		}

		/* Starting from 4.1.3, we use strnncollsp() in comparisons of
		non-latin1_swedish_ci strings. NOTE that the collation order
		changes then: 'b\0\0...' is ordered BEFORE 'b  ...'. Users
		having indexes on such data need to rebuild their tables! */

		ret = charset->coll->strnncollsp(charset,
				  a, a_length,
						 b, b_length, 0);
		if (ret < 0) {
			return(-1);
		} else if (ret > 0) {
			return(1);
		} else {
			return(0);
		}
	default:
		ut_error;
	}

	return(0);
}

/**************************************************************//**
Converts a MySQL type to an InnoDB type. Note that this function returns
the 'mtype' of InnoDB. InnoDB differentiates between MySQL's old <= 4.1
VARCHAR and the new true VARCHAR in >= 5.0.3 by the 'prtype'.
@return	DATA_BINARY, DATA_VARCHAR, ... */
extern "C" UNIV_INTERN
ulint
get_innobase_type_from_mysql_type(
/*==============================*/
	ulint*		unsigned_flag,	/*!< out: DATA_UNSIGNED if an
					'unsigned type';
					at least ENUM and SET,
					and unsigned integer
					types are 'unsigned types' */
	const void*	f)		/*!< in: MySQL Field */
{
	const class Field* field = reinterpret_cast<const class Field*>(f);

	/* The following asserts try to check that the MySQL type code fits in
	8 bits: this is used in ibuf and also when DATA_NOT_NULL is ORed to
	the type */

	DBUG_ASSERT((ulint)MYSQL_TYPE_STRING < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_VAR_STRING < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_DOUBLE < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_FLOAT < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_DECIMAL < 256);

	if (field->flags & UNSIGNED_FLAG) {

		*unsigned_flag = DATA_UNSIGNED;
	} else {
		*unsigned_flag = 0;
	}

	if (field->real_type() == MYSQL_TYPE_ENUM
		|| field->real_type() == MYSQL_TYPE_SET) {

		/* MySQL has field->type() a string type for these, but the
		data is actually internally stored as an unsigned integer
		code! */

		*unsigned_flag = DATA_UNSIGNED; /* MySQL has its own unsigned
						flag set to zero, even though
						internally this is an unsigned
						integer type */
		return(DATA_INT);
	}

	switch (field->type()) {
		/* NOTE that we only allow string types in DATA_MYSQL and
		DATA_VARMYSQL */
	case MYSQL_TYPE_VAR_STRING: /* old <= 4.1 VARCHAR */
	case MYSQL_TYPE_VARCHAR:    /* new >= 5.0.3 true VARCHAR */
		if (field->binary()) {
			return(DATA_BINARY);
		} else if (strcmp(
				   field->charset()->name,
				   "latin1_swedish_ci") == 0) {
			return(DATA_VARCHAR);
		} else {
			return(DATA_VARMYSQL);
		}
	case MYSQL_TYPE_BIT:
	case MYSQL_TYPE_STRING: if (field->binary()) {

			return(DATA_FIXBINARY);
		} else if (strcmp(
				   field->charset()->name,
				   "latin1_swedish_ci") == 0) {
			return(DATA_CHAR);
		} else {
			return(DATA_MYSQL);
		}
	case MYSQL_TYPE_NEWDECIMAL:
		return(DATA_FIXBINARY);
	case MYSQL_TYPE_LONG:
	case MYSQL_TYPE_LONGLONG:
	case MYSQL_TYPE_TINY:
	case MYSQL_TYPE_SHORT:
	case MYSQL_TYPE_INT24:
	case MYSQL_TYPE_DATE:
	case MYSQL_TYPE_DATETIME:
	case MYSQL_TYPE_YEAR:
	case MYSQL_TYPE_NEWDATE:
	case MYSQL_TYPE_TIME:
	case MYSQL_TYPE_TIMESTAMP:
		return(DATA_INT);
	case MYSQL_TYPE_FLOAT:
		return(DATA_FLOAT);
	case MYSQL_TYPE_DOUBLE:
		return(DATA_DOUBLE);
	case MYSQL_TYPE_DECIMAL:
		return(DATA_DECIMAL);
	case MYSQL_TYPE_GEOMETRY:
	case MYSQL_TYPE_TINY_BLOB:
	case MYSQL_TYPE_MEDIUM_BLOB:
	case MYSQL_TYPE_BLOB:
	case MYSQL_TYPE_LONG_BLOB:
		return(DATA_BLOB);
	default:
		ut_error;
	}

	return(0);
}

/*******************************************************************//**
Writes an unsigned integer value < 64k to 2 bytes, in the little-endian
storage format. */
static inline
void
innobase_write_to_2_little_endian(
/*==============================*/
	byte*	buf,	/*!< in: where to store */
	ulint	val)	/*!< in: value to write, must be < 64k */
{
	ut_a(val < 256 * 256);

	buf[0] = (byte)(val & 0xFF);
	buf[1] = (byte)(val / 256);
}

/*******************************************************************//**
Reads an unsigned integer value < 64k from 2 bytes, in the little-endian
storage format.
@return	value */
static inline
uint
innobase_read_from_2_little_endian(
/*===============================*/
	const uchar*	buf)	/*!< in: from where to read */
{
	return (uint) ((ulint)(buf[0]) + 256 * ((ulint)(buf[1])));
}

/*******************************************************************//**
Stores a key value for a row to a buffer.
@return	key value length as stored in buff */
UNIV_INTERN
uint
ha_innobase::store_key_val_for_row(
/*===============================*/
	uint		keynr,	/*!< in: key number */
	char*		buff,	/*!< in/out: buffer for the key value (in MySQL
				format) */
	uint		buff_len,/*!< in: buffer length */
	const uchar*	record)/*!< in: row in MySQL format */
{
	KEY*		key_info	= table->key_info + keynr;
	KEY_PART_INFO*	key_part	= key_info->key_part;
	KEY_PART_INFO*	end		= key_part + key_info->key_parts;
	char*		buff_start	= buff;
	enum_field_types mysql_type;
	Field*		field;
	ibool		is_null;

	DBUG_ENTER("store_key_val_for_row");

	/* The format for storing a key field in MySQL is the following:

	1. If the column can be NULL, then in the first byte we put 1 if the
	field value is NULL, 0 otherwise.

	2. If the column is of a BLOB type (it must be a column prefix field
	in this case), then we put the length of the data in the field to the
	next 2 bytes, in the little-endian format. If the field is SQL NULL,
	then these 2 bytes are set to 0. Note that the length of data in the
	field is <= column prefix length.

	3. In a column prefix field, prefix_len next bytes are reserved for
	data. In a normal field the max field length next bytes are reserved
	for data. For a VARCHAR(n) the max field length is n. If the stored
	value is the SQL NULL then these data bytes are set to 0.

	4. We always use a 2 byte length for a true >= 5.0.3 VARCHAR. Note that
	in the MySQL row format, the length is stored in 1 or 2 bytes,
	depending on the maximum allowed length. But in the MySQL key value
	format, the length always takes 2 bytes.

	We have to zero-fill the buffer so that MySQL is able to use a
	simple memcmp to compare two key values to determine if they are
	equal. MySQL does this to compare contents of two 'ref' values. */

	bzero(buff, buff_len);

	for (; key_part != end; key_part++) {
		is_null = FALSE;

		if (key_part->null_bit) {
			if (record[key_part->null_offset]
						& key_part->null_bit) {
				*buff = 1;
				is_null = TRUE;
			} else {
				*buff = 0;
			}
			buff++;
		}

		field = key_part->field;
		mysql_type = field->type();

		if (mysql_type == MYSQL_TYPE_VARCHAR) {
						/* >= 5.0.3 true VARCHAR */
			ulint		lenlen;
			ulint		len;
			const byte*	data;
			ulint		key_len;
			ulint		true_len;
			CHARSET_INFO*	cs;
			int		error=0;

			key_len = key_part->length;

			if (is_null) {
				buff += key_len + 2;

				continue;
			}
			cs = field->charset();

			lenlen = (ulint)
				(((Field_varstring*)field)->length_bytes);

			data = row_mysql_read_true_varchar(&len,
				(byte*) (record
				+ (ulint)get_field_offset(table, field)),
				lenlen);

			true_len = len;

			/* For multi byte character sets we need to calculate
			the true length of the key */

			if (len > 0 && cs->mbmaxlen > 1) {
				true_len = (ulint) cs->cset->well_formed_len(cs,
						(const char *) data,
						(const char *) data + len,
                                                (uint) (key_len /
                                                        cs->mbmaxlen),
						&error);
			}

			/* In a column prefix index, we may need to truncate
			the stored value: */

			if (true_len > key_len) {
				true_len = key_len;
			}

			/* The length in a key value is always stored in 2
			bytes */

			row_mysql_store_true_var_len((byte*)buff, true_len, 2);
			buff += 2;

			memcpy(buff, data, true_len);

			/* Note that we always reserve the maximum possible
			length of the true VARCHAR in the key value, though
			only len first bytes after the 2 length bytes contain
			actual data. The rest of the space was reset to zero
			in the bzero() call above. */

			buff += key_len;

		} else if (mysql_type == MYSQL_TYPE_TINY_BLOB
			|| mysql_type == MYSQL_TYPE_MEDIUM_BLOB
			|| mysql_type == MYSQL_TYPE_BLOB
4035 4036 4037 4038
			|| mysql_type == MYSQL_TYPE_LONG_BLOB
			/* MYSQL_TYPE_GEOMETRY data is treated
			as BLOB data in innodb. */
			|| mysql_type == MYSQL_TYPE_GEOMETRY) {
4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699

			CHARSET_INFO*	cs;
			ulint		key_len;
			ulint		true_len;
			int		error=0;
			ulint		blob_len;
			const byte*	blob_data;

			ut_a(key_part->key_part_flag & HA_PART_KEY_SEG);

			key_len = key_part->length;

			if (is_null) {
				buff += key_len + 2;

				continue;
			}

			cs = field->charset();

			blob_data = row_mysql_read_blob_ref(&blob_len,
				(byte*) (record
				+ (ulint)get_field_offset(table, field)),
					(ulint) field->pack_length());

			true_len = blob_len;

			ut_a(get_field_offset(table, field)
				== key_part->offset);

			/* For multi byte character sets we need to calculate
			the true length of the key */

			if (blob_len > 0 && cs->mbmaxlen > 1) {
				true_len = (ulint) cs->cset->well_formed_len(cs,
						(const char *) blob_data,
						(const char *) blob_data
							+ blob_len,
                                                (uint) (key_len /
                                                        cs->mbmaxlen),
						&error);
			}

			/* All indexes on BLOB and TEXT are column prefix
			indexes, and we may need to truncate the data to be
			stored in the key value: */

			if (true_len > key_len) {
				true_len = key_len;
			}

			/* MySQL reserves 2 bytes for the length and the
			storage of the number is little-endian */

			innobase_write_to_2_little_endian(
					(byte*)buff, true_len);
			buff += 2;

			memcpy(buff, blob_data, true_len);

			/* Note that we always reserve the maximum possible
			length of the BLOB prefix in the key value. */

			buff += key_len;
		} else {
			/* Here we handle all other data types except the
			true VARCHAR, BLOB and TEXT. Note that the column
			value we store may be also in a column prefix
			index. */

			CHARSET_INFO*		cs;
			ulint			true_len;
			ulint			key_len;
			const uchar*		src_start;
			int			error=0;
			enum_field_types	real_type;

			key_len = key_part->length;

			if (is_null) {
				 buff += key_len;

				 continue;
			}

			src_start = record + key_part->offset;
			real_type = field->real_type();
			true_len = key_len;

			/* Character set for the field is defined only
			to fields whose type is string and real field
			type is not enum or set. For these fields check
			if character set is multi byte. */

			if (real_type != MYSQL_TYPE_ENUM
				&& real_type != MYSQL_TYPE_SET
				&& ( mysql_type == MYSQL_TYPE_VAR_STRING
					|| mysql_type == MYSQL_TYPE_STRING)) {

				cs = field->charset();

				/* For multi byte character sets we need to
				calculate the true length of the key */

				if (key_len > 0 && cs->mbmaxlen > 1) {

					true_len = (ulint)
						cs->cset->well_formed_len(cs,
							(const char *)src_start,
							(const char *)src_start
								+ key_len,
                                                        (uint) (key_len /
                                                                cs->mbmaxlen),
							&error);
				}
			}

			memcpy(buff, src_start, true_len);
			buff += true_len;

			/* Pad the unused space with spaces. Note that no
			padding is ever needed for UCS-2 because in MySQL,
			all UCS2 characters are 2 bytes, as MySQL does not
			support surrogate pairs, which are needed to represent
			characters in the range U+10000 to U+10FFFF. */

			if (true_len < key_len) {
				ulint pad_len = key_len - true_len;
				memset(buff, ' ', pad_len);
				buff += pad_len;
			}
		}
	}

	ut_a(buff <= buff_start + buff_len);

	DBUG_RETURN((uint)(buff - buff_start));
}

/**************************************************************//**
Builds a 'template' to the prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */
static
void
build_template(
/*===========*/
	row_prebuilt_t*	prebuilt,	/*!< in/out: prebuilt struct */
	THD*		thd,		/*!< in: current user thread, used
					only if templ_type is
					ROW_MYSQL_REC_FIELDS */
	TABLE*		table,		/*!< in: MySQL table */
	uint		templ_type)	/*!< in: ROW_MYSQL_WHOLE_ROW or
					ROW_MYSQL_REC_FIELDS */
{
	dict_index_t*	index;
	dict_index_t*	clust_index;
	mysql_row_templ_t* templ;
	Field*		field;
	ulint		n_fields;
	ulint		n_requested_fields	= 0;
	ibool		fetch_all_in_key	= FALSE;
	ibool		fetch_primary_key_cols	= FALSE;
	ulint		i;
	/* byte offset of the end of last requested column */
	ulint		mysql_prefix_len	= 0;

	if (prebuilt->select_lock_type == LOCK_X) {
		/* We always retrieve the whole clustered index record if we
		use exclusive row level locks, for example, if the read is
		done in an UPDATE statement. */

		templ_type = ROW_MYSQL_WHOLE_ROW;
	}

	if (templ_type == ROW_MYSQL_REC_FIELDS) {
		if (prebuilt->hint_need_to_fetch_extra_cols
			== ROW_RETRIEVE_ALL_COLS) {

			/* We know we must at least fetch all columns in the
			key, or all columns in the table */

			if (prebuilt->read_just_key) {
				/* MySQL has instructed us that it is enough
				to fetch the columns in the key; looks like
				MySQL can set this flag also when there is
				only a prefix of the column in the key: in
				that case we retrieve the whole column from
				the clustered index */

				fetch_all_in_key = TRUE;
			} else {
				templ_type = ROW_MYSQL_WHOLE_ROW;
			}
		} else if (prebuilt->hint_need_to_fetch_extra_cols
			== ROW_RETRIEVE_PRIMARY_KEY) {
			/* We must at least fetch all primary key cols. Note
			   that if the clustered index was internally generated
			   by InnoDB on the row id (no primary key was
			   defined), then row_search_for_mysql() will always
			   retrieve the row id to a special buffer in the
			   prebuilt struct. */

			fetch_primary_key_cols = TRUE;
		}
	}

	clust_index = dict_table_get_first_index(prebuilt->table);

	if (templ_type == ROW_MYSQL_REC_FIELDS) {
		index = prebuilt->index;
	} else {
		index = clust_index;
	}

	if (index == clust_index) {
		prebuilt->need_to_access_clustered = TRUE;
	} else {
		prebuilt->need_to_access_clustered = FALSE;
		/* Below we check column by column if we need to access
		the clustered index */
	}

	n_fields = (ulint)table->s->fields; /* number of columns */

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
			mem_alloc(n_fields * sizeof(mysql_row_templ_t));
	}

	prebuilt->template_type = templ_type;
	prebuilt->null_bitmap_len = table->s->null_bytes;

	prebuilt->templ_contains_blob = FALSE;

	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
	for (i = 0; i < n_fields; i++) {
		templ = prebuilt->mysql_template + n_requested_fields;
		field = table->field[i];

		if (UNIV_LIKELY(templ_type == ROW_MYSQL_REC_FIELDS)) {
			/* Decide which columns we should fetch
			and which we can skip. */
			register const ibool	index_contains_field =
				dict_index_contains_col_or_prefix(index, i);

			if (!index_contains_field && prebuilt->read_just_key) {
				/* If this is a 'key read', we do not need
				columns that are not in the key */

				goto skip_field;
			}

			if (index_contains_field && fetch_all_in_key) {
				/* This field is needed in the query */

				goto include_field;
			}

			if (bitmap_is_set(table->read_set, i) ||
			    bitmap_is_set(table->write_set, i)) {
				/* This field is needed in the query */

				goto include_field;
			}

			if (fetch_primary_key_cols
				&& dict_table_col_in_clustered_key(
					index->table, i)) {
				/* This field is needed in the query */

				goto include_field;
			}

			/* This field is not needed in the query, skip it */

			goto skip_field;
		}
include_field:
		n_requested_fields++;

		templ->col_no = i;

		if (index == clust_index) {
			templ->rec_field_no = dict_col_get_clust_pos(
				&index->table->cols[i], index);
		} else {
			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
		}

		if (templ->rec_field_no == ULINT_UNDEFINED) {
			prebuilt->need_to_access_clustered = TRUE;
		}

		if (field->null_ptr) {
			templ->mysql_null_byte_offset =
				(ulint) ((char*) field->null_ptr
					- (char*) table->record[0]);

			templ->mysql_null_bit_mask = (ulint) field->null_bit;
		} else {
			templ->mysql_null_bit_mask = 0;
		}

		templ->mysql_col_offset = (ulint)
					get_field_offset(table, field);

		templ->mysql_col_len = (ulint) field->pack_length();
		if (mysql_prefix_len < templ->mysql_col_offset
				+ templ->mysql_col_len) {
			mysql_prefix_len = templ->mysql_col_offset
				+ templ->mysql_col_len;
		}
		templ->type = index->table->cols[i].mtype;
		templ->mysql_type = (ulint)field->type();

		if (templ->mysql_type == DATA_MYSQL_TRUE_VARCHAR) {
			templ->mysql_length_bytes = (ulint)
				(((Field_varstring*)field)->length_bytes);
		}

		templ->charset = dtype_get_charset_coll(
			index->table->cols[i].prtype);
		templ->mbminlen = index->table->cols[i].mbminlen;
		templ->mbmaxlen = index->table->cols[i].mbmaxlen;
		templ->is_unsigned = index->table->cols[i].prtype
							& DATA_UNSIGNED;
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
		}
skip_field:
		;
	}

	prebuilt->n_template = n_requested_fields;
	prebuilt->mysql_prefix_len = mysql_prefix_len;

	if (index != clust_index && prebuilt->need_to_access_clustered) {
		/* Change rec_field_no's to correspond to the clustered index
		record */
		for (i = 0; i < n_requested_fields; i++) {
			templ = prebuilt->mysql_template + i;

			templ->rec_field_no = dict_col_get_clust_pos(
				&index->table->cols[templ->col_no],
				clust_index);
		}
	}
}

/********************************************************************//**
This special handling is really to overcome the limitations of MySQL's
binlogging. We need to eliminate the non-determinism that will arise in
INSERT ... SELECT type of statements, since MySQL binlog only stores the
min value of the autoinc interval. Once that is fixed we can get rid of
the special lock handling.
@return	DB_SUCCESS if all OK else error code */
UNIV_INTERN
ulint
ha_innobase::innobase_lock_autoinc(void)
/*====================================*/
{
	ulint		error = DB_SUCCESS;

	switch (innobase_autoinc_lock_mode) {
	case AUTOINC_NO_LOCKING:
		/* Acquire only the AUTOINC mutex. */
		dict_table_autoinc_lock(prebuilt->table);
		break;

	case AUTOINC_NEW_STYLE_LOCKING:
		/* For simple (single/multi) row INSERTs, we fallback to the
		old style only if another transaction has already acquired
		the AUTOINC lock on behalf of a LOAD FILE or INSERT ... SELECT
		etc. type of statement. */
		if (thd_sql_command(user_thd) == SQLCOM_INSERT
		    || thd_sql_command(user_thd) == SQLCOM_REPLACE) {
			dict_table_t*	table = prebuilt->table;

			/* Acquire the AUTOINC mutex. */
			dict_table_autoinc_lock(table);

			/* We need to check that another transaction isn't
			already holding the AUTOINC lock on the table. */
			if (table->n_waiting_or_granted_auto_inc_locks) {
				/* Release the mutex to avoid deadlocks. */
				dict_table_autoinc_unlock(table);
			} else {
				break;
			}
		}
		/* Fall through to old style locking. */

	case AUTOINC_OLD_STYLE_LOCKING:
		error = row_lock_table_autoinc_for_mysql(prebuilt);

		if (error == DB_SUCCESS) {

			/* Acquire the AUTOINC mutex. */
			dict_table_autoinc_lock(prebuilt->table);
		}
		break;

	default:
		ut_error;
	}

	return(ulong(error));
}

/********************************************************************//**
Reset the autoinc value in the table.
@return	DB_SUCCESS if all went well else error code */
UNIV_INTERN
ulint
ha_innobase::innobase_reset_autoinc(
/*================================*/
	ulonglong	autoinc)	/*!< in: value to store */
{
	ulint		error;

	error = innobase_lock_autoinc();

	if (error == DB_SUCCESS) {

		dict_table_autoinc_initialize(prebuilt->table, autoinc);

		dict_table_autoinc_unlock(prebuilt->table);
	}

	return(ulong(error));
}

/********************************************************************//**
Store the autoinc value in the table. The autoinc value is only set if
it's greater than the existing autoinc value in the table.
@return	DB_SUCCESS if all went well else error code */
UNIV_INTERN
ulint
ha_innobase::innobase_set_max_autoinc(
/*==================================*/
	ulonglong	auto_inc)	/*!< in: value to store */
{
	ulint		error;

	error = innobase_lock_autoinc();

	if (error == DB_SUCCESS) {

		dict_table_autoinc_update_if_greater(prebuilt->table, auto_inc);

		dict_table_autoinc_unlock(prebuilt->table);
	}

	return(ulong(error));
}

/********************************************************************//**
Stores a row in an InnoDB database, to the table specified in this
handle.
@return	error code */
UNIV_INTERN
int
ha_innobase::write_row(
/*===================*/
	uchar*	record)	/*!< in: a row in MySQL format */
{
	ulint		error = 0;
        int             error_result= 0;
	ibool		auto_inc_used= FALSE;
	ulint		sql_command;
	trx_t*		trx = thd_to_trx(user_thd);

	DBUG_ENTER("ha_innobase::write_row");

	if (prebuilt->trx != trx) {
	  sql_print_error("The transaction object for the table handle is at "
			  "%p, but for the current thread it is at %p",
			  (const void*) prebuilt->trx, (const void*) trx);

		fputs("InnoDB: Dump of 200 bytes around prebuilt: ", stderr);
		ut_print_buf(stderr, ((const byte*)prebuilt) - 100, 200);
		fputs("\n"
			"InnoDB: Dump of 200 bytes around ha_data: ",
			stderr);
		ut_print_buf(stderr, ((const byte*) trx) - 100, 200);
		putc('\n', stderr);
		ut_error;
	}

	ha_statistic_increment(&SSV::ha_write_count);

	if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
		table->timestamp_field->set_time();

	sql_command = thd_sql_command(user_thd);

	if ((sql_command == SQLCOM_ALTER_TABLE
	     || sql_command == SQLCOM_OPTIMIZE
	     || sql_command == SQLCOM_CREATE_INDEX
	     || sql_command == SQLCOM_DROP_INDEX)
	    && num_write_row >= 10000) {
		/* ALTER TABLE is COMMITted at every 10000 copied rows.
		The IX table lock for the original table has to be re-issued.
		As this method will be called on a temporary table where the
		contents of the original table is being copied to, it is
		a bit tricky to determine the source table.  The cursor
		position in the source table need not be adjusted after the
		intermediate COMMIT, since writes by other transactions are
		being blocked by a MySQL table lock TL_WRITE_ALLOW_READ. */

		dict_table_t*	src_table;
		enum lock_mode	mode;

		num_write_row = 0;

		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */

		/* Altering an InnoDB table */
		/* Get the source table. */
		src_table = lock_get_src_table(
				prebuilt->trx, prebuilt->table, &mode);
		if (!src_table) {
no_commit:
			/* Unknown situation: do not commit */
			/*
			ut_print_timestamp(stderr);
			fprintf(stderr,
				"  InnoDB: ALTER TABLE is holding lock"
				" on %lu tables!\n",
				prebuilt->trx->mysql_n_tables_locked);
			*/
			;
		} else if (src_table == prebuilt->table) {
			/* Source table is not in InnoDB format:
			no need to re-acquire locks on it. */

			/* Altering to InnoDB format */
			innobase_commit(ht, user_thd, 1);
			/* Note that this transaction is still active. */
			prebuilt->trx->active_trans = 1;
			/* We will need an IX lock on the destination table. */
			prebuilt->sql_stat_start = TRUE;
		} else {
			/* Ensure that there are no other table locks than
			LOCK_IX and LOCK_AUTO_INC on the destination table. */

			if (!lock_is_table_exclusive(prebuilt->table,
							prebuilt->trx)) {
				goto no_commit;
			}

			/* Commit the transaction.  This will release the table
			locks, so they have to be acquired again. */
			innobase_commit(ht, user_thd, 1);
			/* Note that this transaction is still active. */
			prebuilt->trx->active_trans = 1;
			/* Re-acquire the table lock on the source table. */
			row_lock_table_for_mysql(prebuilt, src_table, mode);
			/* We will need an IX lock on the destination table. */
			prebuilt->sql_stat_start = TRUE;
		}
	}

	num_write_row++;

	/* This is the case where the table has an auto-increment column */
	if (table->next_number_field && record == table->record[0]) {

		/* Reset the error code before calling
		innobase_get_auto_increment(). */
		prebuilt->autoinc_error = DB_SUCCESS;

		if ((error = update_auto_increment())) {

			/* We don't want to mask autoinc overflow errors. */
			if (prebuilt->autoinc_error != DB_SUCCESS) {
				error = (int) prebuilt->autoinc_error;

				goto report_error;
			}

			/* MySQL errors are passed straight back. */
			error_result = (int) error;
			goto func_exit;
		}

		auto_inc_used = TRUE;
	}

	if (prebuilt->mysql_template == NULL
	    || prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {

		/* Build the template used in converting quickly between
		the two database formats */

		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}

	innodb_srv_conc_enter_innodb(prebuilt->trx);

	error = row_insert_for_mysql((byte*) record, prebuilt);

	/* Handle duplicate key errors */
	if (auto_inc_used) {
		ulint		err;
		ulonglong	auto_inc;
		ulonglong	col_max_value;

		/* Note the number of rows processed for this statement, used
		by get_auto_increment() to determine the number of AUTO-INC
		values to reserve. This is only useful for a mult-value INSERT
		and is a statement level counter.*/
		if (trx->n_autoinc_rows > 0) {
			--trx->n_autoinc_rows;
		}

		/* We need the upper limit of the col type to check for
		whether we update the table autoinc counter or not. */
		col_max_value = innobase_get_int_col_max_value(
			table->next_number_field);

		/* Get the value that MySQL attempted to store in the table.*/
		auto_inc = table->next_number_field->val_int();

		switch (error) {
		case DB_DUPLICATE_KEY:

			/* A REPLACE command and LOAD DATA INFILE REPLACE
			handle a duplicate key error themselves, but we
			must update the autoinc counter if we are performing
			those statements. */

			switch (sql_command) {
			case SQLCOM_LOAD:
				if ((trx->duplicates
				    & (TRX_DUP_IGNORE | TRX_DUP_REPLACE))) {

					goto set_max_autoinc;
				}
				break;

			case SQLCOM_REPLACE:
			case SQLCOM_INSERT_SELECT:
			case SQLCOM_REPLACE_SELECT:
				goto set_max_autoinc;

			default:
				break;
			}

			break;

		case DB_SUCCESS:
			/* If the actual value inserted is greater than
			the upper limit of the interval, then we try and
			update the table upper limit. Note: last_value
			will be 0 if get_auto_increment() was not called.*/

4700
			if (auto_inc >= prebuilt->autoinc_last_value) {
4701
set_max_autoinc:
4702 4703 4704 4705
				/* This should filter out the negative
				values set explicitly by the user. */
				if (auto_inc <= col_max_value) {
					ut_a(prebuilt->autoinc_increment > 0);
4706

4707 4708
					ulonglong	need;
					ulonglong	offset;
4709

4710 4711
					offset = prebuilt->autoinc_offset;
					need = prebuilt->autoinc_increment;
4712

4713 4714 4715
					auto_inc = innobase_next_autoinc(
						auto_inc,
						need, offset, col_max_value);
4716

4717 4718
					err = innobase_set_max_autoinc(
						auto_inc);
4719

4720 4721 4722
					if (err != DB_SUCCESS) {
						error = err;
					}
4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283
				}
			}
			break;
		}
	}

	innodb_srv_conc_exit_innodb(prebuilt->trx);

report_error:
	error_result = convert_error_code_to_mysql((int) error,
						   prebuilt->table->flags,
						   user_thd);

func_exit:
	innobase_active_small();

	DBUG_RETURN(error_result);
}

/**********************************************************************//**
Checks which fields have changed in a row and stores information
of them to an update vector.
@return	error number or 0 */
static
int
calc_row_difference(
/*================*/
	upd_t*		uvect,		/*!< in/out: update vector */
	uchar*		old_row,	/*!< in: old row in MySQL format */
	uchar*		new_row,	/*!< in: new row in MySQL format */
	struct st_table* table,		/*!< in: table in MySQL data
					dictionary */
	uchar*		upd_buff,	/*!< in: buffer to use */
	ulint		buff_len,	/*!< in: buffer length */
	row_prebuilt_t*	prebuilt,	/*!< in: InnoDB prebuilt struct */
	THD*		thd)		/*!< in: user thread */
{
	uchar*		original_upd_buff = upd_buff;
	Field*		field;
	enum_field_types field_mysql_type;
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
	ulint		col_pack_len;
	const byte*	new_mysql_row_col;
	const byte*	o_ptr;
	const byte*	n_ptr;
	byte*		buf;
	upd_field_t*	ufield;
	ulint		col_type;
	ulint		n_changed = 0;
	dfield_t	dfield;
	dict_index_t*	clust_index;
	uint		i;

	n_fields = table->s->fields;
	clust_index = dict_table_get_first_index(prebuilt->table);

	/* We use upd_buff to convert changed fields */
	buf = (byte*) upd_buff;

	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

		o_ptr = (const byte*) old_row + get_field_offset(table, field);
		n_ptr = (const byte*) new_row + get_field_offset(table, field);

		/* Use new_mysql_row_col and col_pack_len save the values */

		new_mysql_row_col = n_ptr;
		col_pack_len = field->pack_length();

		o_len = col_pack_len;
		n_len = col_pack_len;

		/* We use o_ptr and n_ptr to dig up the actual data for
		comparison. */

		field_mysql_type = field->type();

		col_type = prebuilt->table->cols[i].mtype;

		switch (col_type) {

		case DATA_BLOB:
			o_ptr = row_mysql_read_blob_ref(&o_len, o_ptr, o_len);
			n_ptr = row_mysql_read_blob_ref(&n_len, n_ptr, n_len);

			break;

		case DATA_VARCHAR:
		case DATA_BINARY:
		case DATA_VARMYSQL:
			if (field_mysql_type == MYSQL_TYPE_VARCHAR) {
				/* This is a >= 5.0.3 type true VARCHAR where
				the real payload data length is stored in
				1 or 2 bytes */

				o_ptr = row_mysql_read_true_varchar(
					&o_len, o_ptr,
					(ulint)
					(((Field_varstring*)field)->length_bytes));

				n_ptr = row_mysql_read_true_varchar(
					&n_len, n_ptr,
					(ulint)
					(((Field_varstring*)field)->length_bytes));
			}

			break;
		default:
			;
		}

		if (field->null_ptr) {
			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
				o_len = UNIV_SQL_NULL;
			}

			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
				n_len = UNIV_SQL_NULL;
			}
		}

		if (o_len != n_len || (o_len != UNIV_SQL_NULL &&
					0 != memcmp(o_ptr, n_ptr, o_len))) {
			/* The field has changed */

			ufield = uvect->fields + n_changed;

			/* Let us use a dummy dfield to make the conversion
			from the MySQL column format to the InnoDB format */

			dict_col_copy_type(prebuilt->table->cols + i,
					   dfield_get_type(&dfield));

			if (n_len != UNIV_SQL_NULL) {
				buf = row_mysql_store_col_in_innobase_format(
					&dfield,
					(byte*)buf,
					TRUE,
					new_mysql_row_col,
					col_pack_len,
					dict_table_is_comp(prebuilt->table));
				dfield_copy_data(&ufield->new_val, &dfield);
			} else {
				dfield_set_null(&ufield->new_val);
			}

			ufield->exp = NULL;
			ufield->orig_len = 0;
			ufield->field_no = dict_col_get_clust_pos(
				&prebuilt->table->cols[i], clust_index);
			n_changed++;
		}
	}

	uvect->n_fields = n_changed;
	uvect->info_bits = 0;

	ut_a(buf <= (byte*)original_upd_buff + buff_len);

	return(0);
}

/**********************************************************************//**
Updates a row given as a parameter to a new value. Note that we are given
whole rows, not just the fields which are updated: this incurs some
overhead for CPU when we check which fields are actually updated.
TODO: currently InnoDB does not prevent the 'Halloween problem':
in a searched update a single row can get updated several times
if its index columns are updated!
@return	error number or 0 */
UNIV_INTERN
int
ha_innobase::update_row(
/*====================*/
	const uchar*	old_row,	/*!< in: old row in MySQL format */
	uchar*		new_row)	/*!< in: new row in MySQL format */
{
	upd_t*		uvect;
	int		error = 0;
	trx_t*		trx = thd_to_trx(user_thd);

	DBUG_ENTER("ha_innobase::update_row");

	ut_a(prebuilt->trx == trx);

	ha_statistic_increment(&SSV::ha_update_count);

	if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
		table->timestamp_field->set_time();

	if (prebuilt->upd_node) {
		uvect = prebuilt->upd_node->update;
	} else {
		uvect = row_get_prebuilt_update_vector(prebuilt);
	}

	/* Build an update vector from the modified fields in the rows
	(uses upd_buff of the handle) */

	calc_row_difference(uvect, (uchar*) old_row, new_row, table,
			upd_buff, (ulint)upd_and_key_val_buff_len,
			prebuilt, user_thd);

	/* This is not a delete */
	prebuilt->upd_node->is_delete = FALSE;

	ut_a(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);

	innodb_srv_conc_enter_innodb(trx);

	error = row_update_for_mysql((byte*) old_row, prebuilt);

	/* We need to do some special AUTOINC handling for the following case:

	INSERT INTO t (c1,c2) VALUES(x,y) ON DUPLICATE KEY UPDATE ...

	We need to use the AUTOINC counter that was actually used by
	MySQL in the UPDATE statement, which can be different from the
	value used in the INSERT statement.*/

	if (error == DB_SUCCESS
	    && table->next_number_field
	    && new_row == table->record[0]
	    && thd_sql_command(user_thd) == SQLCOM_INSERT
	    && (trx->duplicates & (TRX_DUP_IGNORE | TRX_DUP_REPLACE))
		== TRX_DUP_IGNORE)  {

		ulonglong	auto_inc;
		ulonglong	col_max_value;

		auto_inc = table->next_number_field->val_int();

		/* We need the upper limit of the col type to check for
		whether we update the table autoinc counter or not. */
		col_max_value = innobase_get_int_col_max_value(
			table->next_number_field);

		if (auto_inc <= col_max_value && auto_inc != 0) {

			ulonglong	need;
			ulonglong	offset;

			offset = prebuilt->autoinc_offset;
			need = prebuilt->autoinc_increment;

			auto_inc = innobase_next_autoinc(
				auto_inc, need, offset, col_max_value);

			error = innobase_set_max_autoinc(auto_inc);
		}
	}

	innodb_srv_conc_exit_innodb(trx);

	error = convert_error_code_to_mysql(error,
					    prebuilt->table->flags, user_thd);

	if (error == 0 /* success */
	    && uvect->n_fields == 0 /* no columns were updated */) {

		/* This is the same as success, but instructs
		MySQL that the row is not really updated and it
		should not increase the count of updated rows.
		This is fix for http://bugs.mysql.com/29157 */
		error = HA_ERR_RECORD_IS_THE_SAME;
	}

	/* Tell InnoDB server that there might be work for
	utility threads: */

	innobase_active_small();

	DBUG_RETURN(error);
}

/**********************************************************************//**
Deletes a row given as the parameter.
@return	error number or 0 */
UNIV_INTERN
int
ha_innobase::delete_row(
/*====================*/
	const uchar*	record)	/*!< in: a row in MySQL format */
{
	int		error = 0;
	trx_t*		trx = thd_to_trx(user_thd);

	DBUG_ENTER("ha_innobase::delete_row");

	ut_a(prebuilt->trx == trx);

	ha_statistic_increment(&SSV::ha_delete_count);

	if (!prebuilt->upd_node) {
		row_get_prebuilt_update_vector(prebuilt);
	}

	/* This is a delete */

	prebuilt->upd_node->is_delete = TRUE;

	innodb_srv_conc_enter_innodb(trx);

	error = row_update_for_mysql((byte*) record, prebuilt);

	innodb_srv_conc_exit_innodb(trx);

	error = convert_error_code_to_mysql(
		error, prebuilt->table->flags, user_thd);

	/* Tell the InnoDB server that there might be work for
	utility threads: */

	innobase_active_small();

	DBUG_RETURN(error);
}

/**********************************************************************//**
Removes a new lock set on a row, if it was not read optimistically. This can
be called after a row has been read in the processing of an UPDATE or a DELETE
query, if the option innodb_locks_unsafe_for_binlog is set. */
UNIV_INTERN
void
ha_innobase::unlock_row(void)
/*=========================*/
{
	DBUG_ENTER("ha_innobase::unlock_row");

	/* Consistent read does not take any locks, thus there is
	nothing to unlock. */

	if (prebuilt->select_lock_type == LOCK_NONE) {
		DBUG_VOID_RETURN;
	}

	switch (prebuilt->row_read_type) {
	case ROW_READ_WITH_LOCKS:
		if (!srv_locks_unsafe_for_binlog
		    && prebuilt->trx->isolation_level
		    != TRX_ISO_READ_COMMITTED) {
			break;
		}
		/* fall through */
	case ROW_READ_TRY_SEMI_CONSISTENT:
		row_unlock_for_mysql(prebuilt, FALSE);
		break;
	case ROW_READ_DID_SEMI_CONSISTENT:
		prebuilt->row_read_type = ROW_READ_TRY_SEMI_CONSISTENT;
		break;
	}

	DBUG_VOID_RETURN;
}

/* See handler.h and row0mysql.h for docs on this function. */
UNIV_INTERN
bool
ha_innobase::was_semi_consistent_read(void)
/*=======================================*/
{
	return(prebuilt->row_read_type == ROW_READ_DID_SEMI_CONSISTENT);
}

/* See handler.h and row0mysql.h for docs on this function. */
UNIV_INTERN
void
ha_innobase::try_semi_consistent_read(bool yes)
/*===========================================*/
{
	ut_a(prebuilt->trx == thd_to_trx(ha_thd()));

	/* Row read type is set to semi consistent read if this was
	requested by the MySQL and either innodb_locks_unsafe_for_binlog
	option is used or this session is using READ COMMITTED isolation
	level. */

	if (yes
	    && (srv_locks_unsafe_for_binlog
		|| prebuilt->trx->isolation_level == TRX_ISO_READ_COMMITTED)) {
		prebuilt->row_read_type = ROW_READ_TRY_SEMI_CONSISTENT;
	} else {
		prebuilt->row_read_type = ROW_READ_WITH_LOCKS;
	}
}

/******************************************************************//**
Initializes a handle to use an index.
@return	0 or error number */
UNIV_INTERN
int
ha_innobase::index_init(
/*====================*/
	uint	keynr,	/*!< in: key (index) number */
	bool sorted)	/*!< in: 1 if result MUST be sorted according to index */
{
	DBUG_ENTER("index_init");

	DBUG_RETURN(change_active_index(keynr));
}

/******************************************************************//**
Currently does nothing.
@return	0 */
UNIV_INTERN
int
ha_innobase::index_end(void)
/*========================*/
{
	int	error	= 0;
	DBUG_ENTER("index_end");
	active_index=MAX_KEY;
	DBUG_RETURN(error);
}

/*********************************************************************//**
Converts a search mode flag understood by MySQL to a flag understood
by InnoDB. */
static inline
ulint
convert_search_mode_to_innobase(
/*============================*/
	enum ha_rkey_function	find_flag)
{
	switch (find_flag) {
	case HA_READ_KEY_EXACT:
		/* this does not require the index to be UNIQUE */
		return(PAGE_CUR_GE);
	case HA_READ_KEY_OR_NEXT:
		return(PAGE_CUR_GE);
	case HA_READ_KEY_OR_PREV:
		return(PAGE_CUR_LE);
	case HA_READ_AFTER_KEY:	
		return(PAGE_CUR_G);
	case HA_READ_BEFORE_KEY:
		return(PAGE_CUR_L);
	case HA_READ_PREFIX:
		return(PAGE_CUR_GE);
	case HA_READ_PREFIX_LAST:
		return(PAGE_CUR_LE);
	case HA_READ_PREFIX_LAST_OR_PREV:
		return(PAGE_CUR_LE);
		/* In MySQL-4.0 HA_READ_PREFIX and HA_READ_PREFIX_LAST always
		pass a complete-field prefix of a key value as the search
		tuple. I.e., it is not allowed that the last field would
		just contain n first bytes of the full field value.
		MySQL uses a 'padding' trick to convert LIKE 'abc%'
		type queries so that it can use as a search tuple
		a complete-field-prefix of a key value. Thus, the InnoDB
		search mode PAGE_CUR_LE_OR_EXTENDS is never used.
		TODO: when/if MySQL starts to use also partial-field
		prefixes, we have to deal with stripping of spaces
		and comparison of non-latin1 char type fields in
		innobase_mysql_cmp() to get PAGE_CUR_LE_OR_EXTENDS to
		work correctly. */
	case HA_READ_MBR_CONTAIN:
	case HA_READ_MBR_INTERSECT:
	case HA_READ_MBR_WITHIN:
	case HA_READ_MBR_DISJOINT:
	case HA_READ_MBR_EQUAL:
		return(PAGE_CUR_UNSUPP);
	/* do not use "default:" in order to produce a gcc warning:
	enumeration value '...' not handled in switch
	(if -Wswitch or -Wall is used) */
	}

	my_error(ER_CHECK_NOT_IMPLEMENTED, MYF(0), "this functionality");

	return(PAGE_CUR_UNSUPP);
}

/*
   BACKGROUND INFO: HOW A SELECT SQL QUERY IS EXECUTED
   ---------------------------------------------------
The following does not cover all the details, but explains how we determine
the start of a new SQL statement, and what is associated with it.

For each table in the database the MySQL interpreter may have several
table handle instances in use, also in a single SQL query. For each table
handle instance there is an InnoDB  'prebuilt' struct which contains most
of the InnoDB data associated with this table handle instance.

  A) if the user has not explicitly set any MySQL table level locks:

  1) MySQL calls ::external_lock to set an 'intention' table level lock on
the table of the handle instance. There we set
prebuilt->sql_stat_start = TRUE. The flag sql_stat_start should be set
true if we are taking this table handle instance to use in a new SQL
statement issued by the user. We also increment trx->n_mysql_tables_in_use.

  2) If prebuilt->sql_stat_start == TRUE we 'pre-compile' the MySQL search
instructions to prebuilt->template of the table handle instance in
::index_read. The template is used to save CPU time in large joins.

  3) In row_search_for_mysql, if prebuilt->sql_stat_start is true, we
allocate a new consistent read view for the trx if it does not yet have one,
or in the case of a locking read, set an InnoDB 'intention' table level
lock on the table.

  4) We do the SELECT. MySQL may repeatedly call ::index_read for the
same table handle instance, if it is a join.

  5) When the SELECT ends, MySQL removes its intention table level locks
in ::external_lock. When trx->n_mysql_tables_in_use drops to zero,
 (a) we execute a COMMIT there if the autocommit is on,
 (b) we also release possible 'SQL statement level resources' InnoDB may
have for this SQL statement. The MySQL interpreter does NOT execute
autocommit for pure read transactions, though it should. That is why the
table handler in that case has to execute the COMMIT in ::external_lock.

  B) If the user has explicitly set MySQL table level locks, then MySQL
does NOT call ::external_lock at the start of the statement. To determine
when we are at the start of a new SQL statement we at the start of
::index_read also compare the query id to the latest query id where the
table handle instance was used. If it has changed, we know we are at the
start of a new SQL statement. Since the query id can theoretically
overwrap, we use this test only as a secondary way of determining the
start of a new SQL statement. */


/**********************************************************************//**
Positions an index cursor to the index specified in the handle. Fetches the
row if any.
@return	0, HA_ERR_KEY_NOT_FOUND, or error number */
UNIV_INTERN
int
ha_innobase::index_read(
/*====================*/
	uchar*		buf,		/*!< in/out: buffer for the returned
					row */
	const uchar*	key_ptr,	/*!< in: key value; if this is NULL
					we position the cursor at the
					start or end of index; this can
					also contain an InnoDB row id, in
					which case key_len is the InnoDB
					row id length; the key value can
					also be a prefix of a full key value,
					and the last column can be a prefix
					of a full column */
	uint			key_len,/*!< in: key value length */
	enum ha_rkey_function find_flag)/*!< in: search flags from my_base.h */
{
	ulint		mode;
	dict_index_t*	index;
	ulint		match_mode	= 0;
	int		error;
	ulint		ret;

	DBUG_ENTER("index_read");

	ut_a(prebuilt->trx == thd_to_trx(user_thd));

	ha_statistic_increment(&SSV::ha_read_key_count);

	index = prebuilt->index;

5284 5285 5286 5287 5288
	if (UNIV_UNLIKELY(index == NULL)) {
		prebuilt->index_usable = FALSE;
		DBUG_RETURN(HA_ERR_CRASHED);
	}

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	/* Note that if the index for which the search template is built is not
	necessarily prebuilt->index, but can also be the clustered index */

	if (prebuilt->sql_stat_start) {
		build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);
	}

	if (key_ptr) {
		/* Convert the search key value to InnoDB format into
		prebuilt->search_tuple */

		row_sel_convert_mysql_key_to_innobase(
			prebuilt->search_tuple,
			(byte*) key_val_buff,
			(ulint)upd_and_key_val_buff_len,
			index,
			(byte*) key_ptr,
			(ulint) key_len,
			prebuilt->trx);
	} else {
		/* We position the cursor to the last or the first entry
		in the index */

		dtuple_set_n_fields(prebuilt->search_tuple, 0);
	}

	mode = convert_search_mode_to_innobase(find_flag);

	match_mode = 0;

	if (find_flag == HA_READ_KEY_EXACT) {

		match_mode = ROW_SEL_EXACT;

	} else if (find_flag == HA_READ_PREFIX
		   || find_flag == HA_READ_PREFIX_LAST) {

		match_mode = ROW_SEL_EXACT_PREFIX;
	}

	last_match_mode = (uint) match_mode;

	if (mode != PAGE_CUR_UNSUPP) {

		innodb_srv_conc_enter_innodb(prebuilt->trx);

		ret = row_search_for_mysql((byte*) buf, mode, prebuilt,
					   match_mode, 0);

		innodb_srv_conc_exit_innodb(prebuilt->trx);
	} else {

		ret = DB_UNSUPPORTED;
	}

	switch (ret) {
	case DB_SUCCESS:
		error = 0;
		table->status = 0;
		break;
	case DB_RECORD_NOT_FOUND:
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
		break;
	case DB_END_OF_INDEX:
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
		break;
	default:
		error = convert_error_code_to_mysql((int) ret,
						    prebuilt->table->flags,
						    user_thd);
		table->status = STATUS_NOT_FOUND;
		break;
	}

	DBUG_RETURN(error);
}

/*******************************************************************//**
The following functions works like index_read, but it find the last
row with the current key value or prefix.
@return	0, HA_ERR_KEY_NOT_FOUND, or an error code */
UNIV_INTERN
int
ha_innobase::index_read_last(
/*=========================*/
	uchar*		buf,	/*!< out: fetched row */
	const uchar*	key_ptr,/*!< in: key value, or a prefix of a full
				key value */
	uint		key_len)/*!< in: length of the key val or prefix
				in bytes */
{
	return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
}

/********************************************************************//**
Get the index for a handle. Does not change active index.
@return	NULL or index instance. */
UNIV_INTERN
dict_index_t*
ha_innobase::innobase_get_index(
/*============================*/
	uint		keynr)	/*!< in: use this index; MAX_KEY means always
				clustered index, even if it was internally
				generated by InnoDB */
{
	KEY*		key = 0;
	dict_index_t*	index = 0;

	DBUG_ENTER("innobase_get_index");
	ha_statistic_increment(&SSV::ha_read_key_count);

	ut_ad(user_thd == ha_thd());
	ut_a(prebuilt->trx == thd_to_trx(user_thd));

	if (keynr != MAX_KEY && table->s->keys > 0) {
		key = table->key_info + keynr;

5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421
		index = innobase_index_lookup(share, keynr);

		if (index) {
			ut_a(ut_strcmp(index->name, key->name) == 0);
		} else {
			sql_print_error("InnoDB could not find index %s "
					"key no %u for table %s through "
					" its index translation table",
					key ? key->name : "NULL", keynr,
					prebuilt->table->name);

			index = dict_table_get_index_on_name(prebuilt->table,
							     key->name);
		}
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	} else {
		index = dict_table_get_first_index(prebuilt->table);
	}

	if (!index) {
		sql_print_error(
			"Innodb could not find key n:o %u with name %s "
			"from dict cache for table %s",
			keynr, key ? key->name : "NULL",
			prebuilt->table->name);
	}

	DBUG_RETURN(index);
}

/********************************************************************//**
Changes the active index of a handle.
@return	0 or error code */
UNIV_INTERN
int
ha_innobase::change_active_index(
/*=============================*/
	uint	keynr)	/*!< in: use this index; MAX_KEY means always clustered
			index, even if it was internally generated by
			InnoDB */
{
	DBUG_ENTER("change_active_index");

	ut_ad(user_thd == ha_thd());
	ut_a(prebuilt->trx == thd_to_trx(user_thd));

	active_index = keynr;

	prebuilt->index = innobase_get_index(keynr);

	if (UNIV_UNLIKELY(!prebuilt->index)) {
		sql_print_warning("InnoDB: change_active_index(%u) failed",
				  keynr);
5460
		prebuilt->index_usable = FALSE;
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		DBUG_RETURN(1);
	}

	prebuilt->index_usable = row_merge_is_index_usable(prebuilt->trx,
							   prebuilt->index);

	if (UNIV_UNLIKELY(!prebuilt->index_usable)) {
5468 5469 5470 5471
		push_warning_printf(user_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
				    HA_ERR_TABLE_DEF_CHANGED,
				    "InnoDB: insufficient history for index %u",
				    keynr);
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		/* The caller seems to ignore this.  Thus, we must check
		this again in row_search_for_mysql(). */
		DBUG_RETURN(2);
	}

	ut_a(prebuilt->search_tuple != 0);

	dtuple_set_n_fields(prebuilt->search_tuple, prebuilt->index->n_fields);

	dict_index_copy_types(prebuilt->search_tuple, prebuilt->index,
			prebuilt->index->n_fields);

	/* MySQL changes the active index for a handle also during some
	queries, for example SELECT MAX(a), SUM(a) first retrieves the MAX()
	and then calculates the sum. Previously we played safe and used
	the flag ROW_MYSQL_WHOLE_ROW below, but that caused unnecessary
	copying. Starting from MySQL-4.1 we use a more efficient flag here. */

	build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);

	DBUG_RETURN(0);
}

/**********************************************************************//**
Positions an index cursor to the index specified in keynr. Fetches the
row if any.
??? This is only used to read whole keys ???
@return	error number or 0 */
UNIV_INTERN
int
ha_innobase::index_read_idx(
/*========================*/
	uchar*		buf,		/*!< in/out: buffer for the returned
					row */
	uint		keynr,		/*!< in: use this index */
	const uchar*	key,		/*!< in: key value; if this is NULL
					we position the cursor at the
					start or end of index */
	uint		key_len,	/*!< in: key value length */
	enum ha_rkey_function find_flag)/*!< in: search flags from my_base.h */
{
	if (change_active_index(keynr)) {

		return(1);
	}

	return(index_read(buf, key, key_len, find_flag));
}

/***********************************************************************//**
Reads the next or previous row from a cursor, which must have previously been
positioned using index_read.
@return	0, HA_ERR_END_OF_FILE, or error number */
UNIV_INTERN
int
ha_innobase::general_fetch(
/*=======================*/
	uchar*	buf,		/*!< in/out: buffer for next row in MySQL
				format */
	uint	direction,	/*!< in: ROW_SEL_NEXT or ROW_SEL_PREV */
	uint	match_mode)	/*!< in: 0, ROW_SEL_EXACT, or
				ROW_SEL_EXACT_PREFIX */
{
	ulint		ret;
	int		error	= 0;

	DBUG_ENTER("general_fetch");

	ut_a(prebuilt->trx == thd_to_trx(user_thd));

	innodb_srv_conc_enter_innodb(prebuilt->trx);

	ret = row_search_for_mysql(
		(byte*)buf, 0, prebuilt, match_mode, direction);

	innodb_srv_conc_exit_innodb(prebuilt->trx);

	switch (ret) {
	case DB_SUCCESS:
		error = 0;
		table->status = 0;
		break;
	case DB_RECORD_NOT_FOUND:
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
		break;
	case DB_END_OF_INDEX:
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
		break;
	default:
		error = convert_error_code_to_mysql(
			(int) ret, prebuilt->table->flags, user_thd);
		table->status = STATUS_NOT_FOUND;
		break;
	}

	DBUG_RETURN(error);
}

/***********************************************************************//**
Reads the next row from a cursor, which must have previously been
positioned using index_read.
@return	0, HA_ERR_END_OF_FILE, or error number */
UNIV_INTERN
int
ha_innobase::index_next(
/*====================*/
	uchar*		buf)	/*!< in/out: buffer for next row in MySQL
				format */
{
	ha_statistic_increment(&SSV::ha_read_next_count);

	return(general_fetch(buf, ROW_SEL_NEXT, 0));
}

/*******************************************************************//**
Reads the next row matching to the key value given as the parameter.
@return	0, HA_ERR_END_OF_FILE, or error number */
UNIV_INTERN
int
ha_innobase::index_next_same(
/*=========================*/
	uchar*		buf,	/*!< in/out: buffer for the row */
	const uchar*	key,	/*!< in: key value */
	uint		keylen)	/*!< in: key value length */
{
	ha_statistic_increment(&SSV::ha_read_next_count);

	return(general_fetch(buf, ROW_SEL_NEXT, last_match_mode));
}

/***********************************************************************//**
Reads the previous row from a cursor, which must have previously been
positioned using index_read.
@return	0, HA_ERR_END_OF_FILE, or error number */
UNIV_INTERN
int
ha_innobase::index_prev(
/*====================*/
	uchar*	buf)	/*!< in/out: buffer for previous row in MySQL format */
{
	ha_statistic_increment(&SSV::ha_read_prev_count);

	return(general_fetch(buf, ROW_SEL_PREV, 0));
}

/********************************************************************//**
Positions a cursor on the first record in an index and reads the
corresponding row to buf.
@return	0, HA_ERR_END_OF_FILE, or error code */
UNIV_INTERN
int
ha_innobase::index_first(
/*=====================*/
	uchar*	buf)	/*!< in/out: buffer for the row */
{
	int	error;

	DBUG_ENTER("index_first");
	ha_statistic_increment(&SSV::ha_read_first_count);

	error = index_read(buf, NULL, 0, HA_READ_AFTER_KEY);

	/* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */

	if (error == HA_ERR_KEY_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
	}

	DBUG_RETURN(error);
}

/********************************************************************//**
Positions a cursor on the last record in an index and reads the
corresponding row to buf.
@return	0, HA_ERR_END_OF_FILE, or error code */
UNIV_INTERN
int
ha_innobase::index_last(
/*====================*/
	uchar*	buf)	/*!< in/out: buffer for the row */
{
	int	error;

	DBUG_ENTER("index_last");
	ha_statistic_increment(&SSV::ha_read_last_count);

	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);

	/* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */

	if (error == HA_ERR_KEY_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
	}

	DBUG_RETURN(error);
}

/****************************************************************//**
Initialize a table scan.
@return	0 or error number */
UNIV_INTERN
int
ha_innobase::rnd_init(
/*==================*/
	bool	scan)	/*!< in: TRUE if table/index scan FALSE otherwise */
{
	int	err;

	/* Store the active index value so that we can restore the original
	value after a scan */

	if (prebuilt->clust_index_was_generated) {
		err = change_active_index(MAX_KEY);
	} else {
		err = change_active_index(primary_key);
	}

	/* Don't use semi-consistent read in random row reads (by position).
	This means we must disable semi_consistent_read if scan is false */

	if (!scan) {
		try_semi_consistent_read(0);
	}

	start_of_scan = 1;

	return(err);
}

/*****************************************************************//**
Ends a table scan.
@return	0 or error number */
UNIV_INTERN
int
ha_innobase::rnd_end(void)
/*======================*/
{
	return(index_end());
}

/*****************************************************************//**
Reads the next row in a table scan (also used to read the FIRST row
in a table scan).
@return	0, HA_ERR_END_OF_FILE, or error number */
UNIV_INTERN
int
ha_innobase::rnd_next(
/*==================*/
	uchar*	buf)	/*!< in/out: returns the row in this buffer,
			in MySQL format */
{
	int	error;

	DBUG_ENTER("rnd_next");
	ha_statistic_increment(&SSV::ha_read_rnd_next_count);

	if (start_of_scan) {
		error = index_first(buf);

		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}

		start_of_scan = 0;
	} else {
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
	}

	DBUG_RETURN(error);
}

/**********************************************************************//**
Fetches a row from the table based on a row reference.
@return	0, HA_ERR_KEY_NOT_FOUND, or error code */
UNIV_INTERN
int
ha_innobase::rnd_pos(
/*=================*/
	uchar*	buf,	/*!< in/out: buffer for the row */
	uchar*	pos)	/*!< in: primary key value of the row in the
			MySQL format, or the row id if the clustered
			index was internally generated by InnoDB; the
			length of data in pos has to be ref_length */
{
	int		error;
	uint		keynr	= active_index;
	DBUG_ENTER("rnd_pos");
	DBUG_DUMP("key", pos, ref_length);

	ha_statistic_increment(&SSV::ha_read_rnd_count);

	ut_a(prebuilt->trx == thd_to_trx(ha_thd()));

	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from the row id: the
		row reference is the row id, not any key value
		that MySQL knows of */

		error = change_active_index(MAX_KEY);
	} else {
		error = change_active_index(primary_key);
	}

	if (error) {
		DBUG_PRINT("error", ("Got error: %d", error));
		DBUG_RETURN(error);
	}

	/* Note that we assume the length of the row reference is fixed
	for the table, and it is == ref_length */

	error = index_read(buf, pos, ref_length, HA_READ_KEY_EXACT);

	if (error) {
		DBUG_PRINT("error", ("Got error: %d", error));
	}

	change_active_index(keynr);

	DBUG_RETURN(error);
}

/*********************************************************************//**
Stores a reference to the current row to 'ref' field of the handle. Note
that in the case where we have generated the clustered index for the
table, the function parameter is illogical: we MUST ASSUME that 'record'
is the current 'position' of the handle, because if row ref is actually
the row id internally generated in InnoDB, then 'record' does not contain
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
UNIV_INTERN
void
ha_innobase::position(
/*==================*/
	const uchar*	record)	/*!< in: row in MySQL format */
{
	uint		len;

	ut_a(prebuilt->trx == thd_to_trx(ha_thd()));

	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from row id: the
		row reference will be the row id, not any key value
		that MySQL knows of */

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
	}

	/* We assume that the 'ref' value len is always fixed for the same
	table. */

	if (len != ref_length) {
	  sql_print_error("Stored ref len is %lu, but table ref len is %lu",
			  (ulong) len, (ulong) ref_length);
	}
}

/* limit innodb monitor access to users with PROCESS privilege.
See http://bugs.mysql.com/32710 for expl. why we choose PROCESS. */
#define IS_MAGIC_TABLE_AND_USER_DENIED_ACCESS(table_name, thd) \
	(row_is_magic_monitor_table(table_name) \
	 && check_global_access(thd, PROCESS_ACL))

/*****************************************************************//**
Creates a table definition to an InnoDB database. */
static
int
create_table_def(
/*=============*/
	trx_t*		trx,		/*!< in: InnoDB transaction handle */
	TABLE*		form,		/*!< in: information on table
					columns and indexes */
	const char*	table_name,	/*!< in: table name */
	const char*	path_of_temp_table,/*!< in: if this is a table explicitly
					created by the user with the
					TEMPORARY keyword, then this
					parameter is the dir path where the
					table should be placed if we create
					an .ibd file for it (no .ibd extension
					in the path, though); otherwise this
					is NULL */
	ulint		flags)		/*!< in: table flags */
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
	int		error;
	ulint		col_type;
	ulint		col_len;
	ulint		nulls_allowed;
	ulint		unsigned_type;
	ulint		binary_type;
	ulint		long_true_varchar;
	ulint		charset_no;
	ulint		i;

	DBUG_ENTER("create_table_def");
	DBUG_PRINT("enter", ("table_name: %s", table_name));

	ut_a(trx->mysql_thd != NULL);
	if (IS_MAGIC_TABLE_AND_USER_DENIED_ACCESS(table_name,
						  (THD*) trx->mysql_thd)) {
		DBUG_RETURN(HA_ERR_GENERIC);
	}

	n_cols = form->s->fields;

	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */

	table = dict_mem_table_create(table_name, 0, n_cols, flags);

	if (path_of_temp_table) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, path_of_temp_table);
	}

	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

		col_type = get_innobase_type_from_mysql_type(&unsigned_type,
									field);
		if (field->null_ptr) {
			nulls_allowed = 0;
		} else {
			nulls_allowed = DATA_NOT_NULL;
		}

		if (field->binary()) {
			binary_type = DATA_BINARY_TYPE;
		} else {
			binary_type = 0;
		}

		charset_no = 0;

		if (dtype_is_string_type(col_type)) {

			charset_no = (ulint)field->charset()->number;

			if (UNIV_UNLIKELY(charset_no >= 256)) {
				/* in data0type.h we assume that the
				number fits in one byte in prtype */
				push_warning_printf(
					(THD*) trx->mysql_thd,
5926
					MYSQL_ERROR::WARN_LEVEL_WARN,
5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954
					ER_CANT_CREATE_TABLE,
					"In InnoDB, charset-collation codes"
					" must be below 256."
					" Unsupported code %lu.",
					(ulong) charset_no);
				DBUG_RETURN(ER_CANT_CREATE_TABLE);
			}
		}

		ut_a(field->type() < 256); /* we assume in dtype_form_prtype()
					   that this fits in one byte */
		col_len = field->pack_length();

		/* The MySQL pack length contains 1 or 2 bytes length field
		for a true VARCHAR. Let us subtract that, so that the InnoDB
		column length in the InnoDB data dictionary is the real
		maximum byte length of the actual data. */

		long_true_varchar = 0;

		if (field->type() == MYSQL_TYPE_VARCHAR) {
			col_len -= ((Field_varstring*)field)->length_bytes;

			if (((Field_varstring*)field)->length_bytes == 2) {
				long_true_varchar = DATA_LONG_TRUE_VARCHAR;
			}
		}

5955 5956 5957
		/* First check whether the column to be added has a
		system reserved name. */
		if (dict_col_name_is_reserved(field->field_name)){
5958 5959
			my_error(ER_WRONG_COLUMN_NAME, MYF(0),
				 field->field_name);
5960 5961 5962 5963 5964 5965 5966 5967

			dict_mem_table_free(table);
			trx_commit_for_mysql(trx);

			error = DB_ERROR;
			goto error_ret;
		}

5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980
		dict_mem_table_add_col(table, table->heap,
			(char*) field->field_name,
			col_type,
			dtype_form_prtype(
				(ulint)field->type()
				| nulls_allowed | unsigned_type
				| binary_type | long_true_varchar,
				charset_no),
			col_len);
	}

	error = row_create_table_for_mysql(table, trx);

5981 5982 5983 5984 5985 5986 5987 5988
	if (error == DB_DUPLICATE_KEY) {
		char buf[100];
		innobase_convert_identifier(buf, sizeof buf,
					    table_name, strlen(table_name),
					    trx->mysql_thd, TRUE);
		my_error(ER_TABLE_EXISTS_ERROR, MYF(0), buf);
	}

5989
error_ret:
5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027
	error = convert_error_code_to_mysql(error, flags, NULL);

	DBUG_RETURN(error);
}

/*****************************************************************//**
Creates an index in an InnoDB database. */
static
int
create_index(
/*=========*/
	trx_t*		trx,		/*!< in: InnoDB transaction handle */
	TABLE*		form,		/*!< in: information on table
					columns and indexes */
	ulint		flags,		/*!< in: InnoDB table flags */
	const char*	table_name,	/*!< in: table name */
	uint		key_num)	/*!< in: index number */
{
	Field*		field;
	dict_index_t*	index;
	int		error;
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
	ulint		col_type;
	ulint		prefix_len;
	ulint		is_unsigned;
	ulint		i;
	ulint		j;
	ulint*		field_lengths;

	DBUG_ENTER("create_index");

	key = form->key_info + key_num;

	n_fields = key->key_parts;

6028 6029 6030
	/* Assert that "GEN_CLUST_INDEX" cannot be used as non-primary index */
	ut_a(innobase_strcasecmp(key->name, innobase_index_reserve_name) != 0);

6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138
	ind_type = 0;

	if (key_num == form->s->primary_key) {
		ind_type = ind_type | DICT_CLUSTERED;
	}

	if (key->flags & HA_NOSAME ) {
		ind_type = ind_type | DICT_UNIQUE;
	}

	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */

	index = dict_mem_index_create(table_name, key->name, 0,
				      ind_type, n_fields);

	field_lengths = (ulint*) my_malloc(sizeof(ulint) * n_fields,
		MYF(MY_FAE));

	for (i = 0; i < n_fields; i++) {
		key_part = key->key_part + i;

		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
		field in an index: we only store a specified number of first
		bytes of the column to the index field.) The flag does not
		seem to be properly set by MySQL. Let us fall back on testing
		the length of the key part versus the column. */

		field = NULL;
		for (j = 0; j < form->s->fields; j++) {

			field = form->field[j];

			if (0 == innobase_strcasecmp(
					field->field_name,
					key_part->field->field_name)) {
				/* Found the corresponding column */

				break;
			}
		}

		ut_a(j < form->s->fields);

		col_type = get_innobase_type_from_mysql_type(
					&is_unsigned, key_part->field);

		if (DATA_BLOB == col_type
			|| (key_part->length < field->pack_length()
				&& field->type() != MYSQL_TYPE_VARCHAR)
			|| (field->type() == MYSQL_TYPE_VARCHAR
				&& key_part->length < field->pack_length()
				- ((Field_varstring*)field)->length_bytes)) {

			prefix_len = key_part->length;

			if (col_type == DATA_INT
				|| col_type == DATA_FLOAT
				|| col_type == DATA_DOUBLE
				|| col_type == DATA_DECIMAL) {
				sql_print_error(
					"MySQL is trying to create a column "
					"prefix index field, on an "
					"inappropriate data type. Table "
					"name %s, column name %s.",
					table_name,
					key_part->field->field_name);

				prefix_len = 0;
			}
		} else {
			prefix_len = 0;
		}

		field_lengths[i] = key_part->length;

		dict_mem_index_add_field(index,
			(char*) key_part->field->field_name, prefix_len);
	}

	/* Even though we've defined max_supported_key_part_length, we
	still do our own checking using field_lengths to be absolutely
	sure we don't create too long indexes. */
	error = row_create_index_for_mysql(index, trx, field_lengths);

	error = convert_error_code_to_mysql(error, flags, NULL);

	my_free(field_lengths, MYF(0));

	DBUG_RETURN(error);
}

/*****************************************************************//**
Creates an index to an InnoDB table when the user has defined no
primary index. */
static
int
create_clustered_index_when_no_primary(
/*===================================*/
	trx_t*		trx,		/*!< in: InnoDB transaction handle */
	ulint		flags,		/*!< in: InnoDB table flags */
	const char*	table_name)	/*!< in: table name */
{
	dict_index_t*	index;
	int		error;

	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
6139 6140
	index = dict_mem_index_create(table_name,
				      innobase_index_reserve_name,
6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192
				      0, DICT_CLUSTERED, 0);

	error = row_create_index_for_mysql(index, trx, NULL);

	error = convert_error_code_to_mysql(error, flags, NULL);

	return(error);
}

/*****************************************************************//**
Validates the create options. We may build on this function
in future. For now, it checks two specifiers:
KEY_BLOCK_SIZE and ROW_FORMAT
If innodb_strict_mode is not set then this function is a no-op
@return	TRUE if valid. */
static
ibool
create_options_are_valid(
/*=====================*/
	THD*		thd,		/*!< in: connection thread. */
	TABLE*		form,		/*!< in: information on table
					columns and indexes */
	HA_CREATE_INFO*	create_info)	/*!< in: create info. */
{
	ibool 	kbs_specified	= FALSE;
	ibool	ret		= TRUE;


	ut_ad(thd != NULL);

	/* If innodb_strict_mode is not set don't do any validation. */
	if (!(THDVAR(thd, strict_mode))) {
		return(TRUE);
	}

	ut_ad(form != NULL);
	ut_ad(create_info != NULL);

	/* First check if KEY_BLOCK_SIZE was specified. */
	if (create_info->key_block_size
	    || (create_info->used_fields & HA_CREATE_USED_KEY_BLOCK_SIZE)) {

		kbs_specified = TRUE;
		switch (create_info->key_block_size) {
		case 1:
		case 2:
		case 4:
		case 8:
		case 16:
			/* Valid value. */
			break;
		default:
6193
			push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206
					    ER_ILLEGAL_HA_CREATE_OPTION,
					    "InnoDB: invalid"
					    " KEY_BLOCK_SIZE = %lu."
					    " Valid values are"
					    " [1, 2, 4, 8, 16]",
					    create_info->key_block_size);
			ret = FALSE;
		}
	}
	
	/* If KEY_BLOCK_SIZE was specified, check for its
	dependencies. */
	if (kbs_specified && !srv_file_per_table) {
6207
		push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
6208 6209 6210 6211 6212 6213 6214
			     ER_ILLEGAL_HA_CREATE_OPTION,
			     "InnoDB: KEY_BLOCK_SIZE"
			     " requires innodb_file_per_table.");
		ret = FALSE;
	}

	if (kbs_specified && srv_file_format < DICT_TF_FORMAT_ZIP) {
6215
		push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238
			     ER_ILLEGAL_HA_CREATE_OPTION,
			     "InnoDB: KEY_BLOCK_SIZE"
			     " requires innodb_file_format >"
			     " Antelope.");
		ret = FALSE;
	}

	/* Now check for ROW_FORMAT specifier. */
	if (create_info->used_fields & HA_CREATE_USED_ROW_FORMAT) {
		switch (form->s->row_type) {
			const char* row_format_name;
		case ROW_TYPE_COMPRESSED:
		case ROW_TYPE_DYNAMIC:
			row_format_name
				= form->s->row_type == ROW_TYPE_COMPRESSED
				? "COMPRESSED"
				: "DYNAMIC";

			/* These two ROW_FORMATs require
			srv_file_per_table and srv_file_format */
			if (!srv_file_per_table) {
				push_warning_printf(
					thd,
6239
					MYSQL_ERROR::WARN_LEVEL_WARN,
6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: ROW_FORMAT=%s"
					" requires innodb_file_per_table.",
					row_format_name);
					ret = FALSE;

			}

			if (srv_file_format < DICT_TF_FORMAT_ZIP) {
				push_warning_printf(
					thd,
6251
					MYSQL_ERROR::WARN_LEVEL_WARN,
6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: ROW_FORMAT=%s"
					" requires innodb_file_format >"
					" Antelope.",
					row_format_name);
					ret = FALSE;
			}

			/* Cannot specify KEY_BLOCK_SIZE with
			ROW_FORMAT = DYNAMIC.
			However, we do allow COMPRESSED to be
			specified with KEY_BLOCK_SIZE. */
			if (kbs_specified
			    && form->s->row_type == ROW_TYPE_DYNAMIC) {
				push_warning_printf(
					thd,
6268
					MYSQL_ERROR::WARN_LEVEL_WARN,
6269 6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: cannot specify"
					" ROW_FORMAT = DYNAMIC with"
					" KEY_BLOCK_SIZE.");
					ret = FALSE;
			}

			break;

		case ROW_TYPE_REDUNDANT:
		case ROW_TYPE_COMPACT:
		case ROW_TYPE_DEFAULT:
			/* Default is COMPACT. */
			row_format_name
				= form->s->row_type == ROW_TYPE_REDUNDANT
				? "REDUNDANT"
				: "COMPACT";

			/* Cannot specify KEY_BLOCK_SIZE with these
			format specifiers. */
			if (kbs_specified) {
				push_warning_printf(
					thd,
6292
					MYSQL_ERROR::WARN_LEVEL_WARN,
6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: cannot specify"
					" ROW_FORMAT = %s with"
					" KEY_BLOCK_SIZE.",
					row_format_name);
					ret = FALSE;
			}

			break;

		default:
			push_warning(thd,
6305
				     MYSQL_ERROR::WARN_LEVEL_WARN,
6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368
				     ER_ILLEGAL_HA_CREATE_OPTION,
				     "InnoDB: invalid ROW_FORMAT specifier.");
			ret = FALSE;

		}
	}

	return(ret);
}

/*****************************************************************//**
Update create_info.  Used in SHOW CREATE TABLE et al. */
UNIV_INTERN
void
ha_innobase::update_create_info(
/*============================*/
	HA_CREATE_INFO* create_info)	/*!< in/out: create info */
{
  if (!(create_info->used_fields & HA_CREATE_USED_AUTO)) {
    ha_innobase::info(HA_STATUS_AUTO);
    create_info->auto_increment_value = stats.auto_increment_value;
  }
}

/*****************************************************************//**
Creates a new table to an InnoDB database.
@return	error number */
UNIV_INTERN
int
ha_innobase::create(
/*================*/
	const char*	name,		/*!< in: table name */
	TABLE*		form,		/*!< in: information on table
					columns and indexes */
	HA_CREATE_INFO*	create_info)	/*!< in: more information of the
					created table, contains also the
					create statement string */
{
	int		error;
	dict_table_t*	innobase_table;
	trx_t*		parent_trx;
	trx_t*		trx;
	int		primary_key_no;
	uint		i;
	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
	THD*		thd = ha_thd();
	ib_int64_t	auto_inc_value;
	ulint		flags;
	/* Cache the value of innodb_file_format, in case it is
	modified by another thread while the table is being created. */
	const ulint	file_format = srv_file_format;

	DBUG_ENTER("ha_innobase::create");

	DBUG_ASSERT(thd != NULL);
	DBUG_ASSERT(create_info != NULL);

#ifdef __WIN__
	/* Names passed in from server are in two formats:
	1. <database_name>/<table_name>: for normal table creation
	2. full path: for temp table creation, or sym link

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	When srv_file_per_table is on and mysqld_embedded is off,
	check for full path pattern, i.e.
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	X:\dir\...,		X is a driver letter, or
	\\dir1\dir2\...,	UNC path
	returns error if it is in full path format, but not creating a temp.
	table. Currently InnoDB does not support symbolic link on Windows. */

	if (srv_file_per_table
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	    && !mysqld_embedded
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	    && (!create_info->options & HA_LEX_CREATE_TMP_TABLE)) {

		if ((name[1] == ':')
		    || (name[0] == '\\' && name[1] == '\\')) {
			sql_print_error("Cannot create table %s\n", name);
			DBUG_RETURN(HA_ERR_GENERIC);
		}
	}
#endif

	if (form->s->fields > 1000) {
		/* The limit probably should be REC_MAX_N_FIELDS - 3 = 1020,
		but we play safe here */

		DBUG_RETURN(HA_ERR_TO_BIG_ROW);
	}

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	parent_trx = check_trx_exists(thd);

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);

	trx = innobase_trx_allocate(thd);

	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

	strcpy(name2, name);

	normalize_table_name(norm_name, name2);

	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
	or lock waits can happen in it during a table create operation.
	Drop table etc. do this latching in row0mysql.c. */

	row_mysql_lock_data_dictionary(trx);

	/* Create the table definition in InnoDB */

	flags = 0;

	/* Validate create options if innodb_strict_mode is set. */
	if (!create_options_are_valid(thd, form, create_info)) {
		error = ER_ILLEGAL_HA_CREATE_OPTION;
		goto cleanup;
	}

	if (create_info->key_block_size
	    || (create_info->used_fields & HA_CREATE_USED_KEY_BLOCK_SIZE)) {
		/* Determine the page_zip.ssize corresponding to the
		requested page size (key_block_size) in kilobytes. */

		ulint	ssize, ksize;
		ulint	key_block_size = create_info->key_block_size;

		for (ssize = ksize = 1; ssize <= DICT_TF_ZSSIZE_MAX;
		     ssize++, ksize <<= 1) {
			if (key_block_size == ksize) {
				flags = ssize << DICT_TF_ZSSIZE_SHIFT
					| DICT_TF_COMPACT
					| DICT_TF_FORMAT_ZIP
					  << DICT_TF_FORMAT_SHIFT;
				break;
			}
		}

		if (!srv_file_per_table) {
			push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
				     ER_ILLEGAL_HA_CREATE_OPTION,
				     "InnoDB: KEY_BLOCK_SIZE"
				     " requires innodb_file_per_table.");
			flags = 0;
		}

		if (file_format < DICT_TF_FORMAT_ZIP) {
			push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
				     ER_ILLEGAL_HA_CREATE_OPTION,
				     "InnoDB: KEY_BLOCK_SIZE"
				     " requires innodb_file_format >"
				     " Antelope.");
			flags = 0;
		}

		if (!flags) {
			push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
					    ER_ILLEGAL_HA_CREATE_OPTION,
					    "InnoDB: ignoring"
					    " KEY_BLOCK_SIZE=%lu.",
					    create_info->key_block_size);
		}
	}

	if (create_info->used_fields & HA_CREATE_USED_ROW_FORMAT) {
		if (flags) {
			/* KEY_BLOCK_SIZE was specified. */
			if (form->s->row_type != ROW_TYPE_COMPRESSED) {
				/* ROW_FORMAT other than COMPRESSED
				ignores KEY_BLOCK_SIZE.  It does not
				make sense to reject conflicting
				KEY_BLOCK_SIZE and ROW_FORMAT, because
				such combinations can be obtained
				with ALTER TABLE anyway. */
				push_warning_printf(
					thd,
					MYSQL_ERROR::WARN_LEVEL_WARN,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: ignoring KEY_BLOCK_SIZE=%lu"
					" unless ROW_FORMAT=COMPRESSED.",
					create_info->key_block_size);
				flags = 0;
			}
		} else {
			/* No KEY_BLOCK_SIZE */
			if (form->s->row_type == ROW_TYPE_COMPRESSED) {
				/* ROW_FORMAT=COMPRESSED without
				KEY_BLOCK_SIZE implies half the
				maximum KEY_BLOCK_SIZE. */
				flags = (DICT_TF_ZSSIZE_MAX - 1)
					<< DICT_TF_ZSSIZE_SHIFT
					| DICT_TF_COMPACT
					| DICT_TF_FORMAT_ZIP
					<< DICT_TF_FORMAT_SHIFT;
#if DICT_TF_ZSSIZE_MAX < 1
# error "DICT_TF_ZSSIZE_MAX < 1"
#endif
			}
		}

		switch (form->s->row_type) {
			const char* row_format_name;
		case ROW_TYPE_REDUNDANT:
			break;
		case ROW_TYPE_COMPRESSED:
		case ROW_TYPE_DYNAMIC:
			row_format_name
				= form->s->row_type == ROW_TYPE_COMPRESSED
				? "COMPRESSED"
				: "DYNAMIC";

			if (!srv_file_per_table) {
				push_warning_printf(
					thd,
					MYSQL_ERROR::WARN_LEVEL_WARN,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: ROW_FORMAT=%s"
					" requires innodb_file_per_table.",
					row_format_name);
			} else if (file_format < DICT_TF_FORMAT_ZIP) {
				push_warning_printf(
					thd,
					MYSQL_ERROR::WARN_LEVEL_WARN,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: ROW_FORMAT=%s"
					" requires innodb_file_format >"
					" Antelope.",
					row_format_name);
			} else {
				flags |= DICT_TF_COMPACT
					| (DICT_TF_FORMAT_ZIP
					   << DICT_TF_FORMAT_SHIFT);
				break;
			}

			/* fall through */
		case ROW_TYPE_NOT_USED:
		case ROW_TYPE_FIXED:
		default:
			push_warning(thd,
				     MYSQL_ERROR::WARN_LEVEL_WARN,
				     ER_ILLEGAL_HA_CREATE_OPTION,
				     "InnoDB: assuming ROW_FORMAT=COMPACT.");
		case ROW_TYPE_DEFAULT:
		case ROW_TYPE_COMPACT:
			flags = DICT_TF_COMPACT;
			break;
		}
	} else if (!flags) {
		/* No KEY_BLOCK_SIZE or ROW_FORMAT specified:
		use ROW_FORMAT=COMPACT by default. */
		flags = DICT_TF_COMPACT;
	}

	/* Look for a primary key */

	primary_key_no= (form->s->primary_key != MAX_KEY ?
			 (int) form->s->primary_key :
			 -1);

	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

Sergey Vojtovich's avatar
Sergey Vojtovich committed
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	ut_a(primary_key_no == -1 || primary_key_no == 0);
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	/* Check for name conflicts (with reserved name) for
	any user indices to be created. */
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	if (innobase_index_name_is_reserved(trx, form->key_info,
					    form->s->keys)) {
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		error = -1;
		goto cleanup;
	}

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	if (create_info->options & HA_LEX_CREATE_TMP_TABLE) {
		flags |= DICT_TF2_TEMPORARY << DICT_TF2_SHIFT;
	}

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	error = create_table_def(trx, form, norm_name,
		create_info->options & HA_LEX_CREATE_TMP_TABLE ? name2 : NULL,
		flags);

	if (error) {
		goto cleanup;
	}


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	/* Create the keys */

	if (form->s->keys == 0 || primary_key_no == -1) {
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
		by InnoDB */

		error = create_clustered_index_when_no_primary(
			trx, flags, norm_name);
		if (error) {
			goto cleanup;
		}
	}

	if (primary_key_no != -1) {
		/* In InnoDB the clustered index must always be created
		first */
		if ((error = create_index(trx, form, flags, norm_name,
					  (uint) primary_key_no))) {
			goto cleanup;
		}
	}

	for (i = 0; i < form->s->keys; i++) {

		if (i != (uint) primary_key_no) {

			if ((error = create_index(trx, form, flags, norm_name,
						  i))) {
				goto cleanup;
			}
		}
	}

	if (*trx->mysql_query_str) {
		error = row_table_add_foreign_constraints(trx,
			*trx->mysql_query_str, norm_name,
			create_info->options & HA_LEX_CREATE_TMP_TABLE);

		error = convert_error_code_to_mysql(error, flags, NULL);

		if (error) {
			goto cleanup;
		}
	}

	innobase_commit_low(trx);

	row_mysql_unlock_data_dictionary(trx);

	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */

	log_buffer_flush_to_disk();

	innobase_table = dict_table_get(norm_name, FALSE);

	DBUG_ASSERT(innobase_table != 0);

	if (innobase_table) {
		/* We update the highest file format in the system table
		space, if this table has higher file format setting. */

		trx_sys_file_format_max_upgrade(
			(const char**) &innobase_file_format_check,
			dict_table_get_format(innobase_table));
	}

	/* Note: We can't call update_thd() as prebuilt will not be
	setup at this stage and so we use thd. */

	/* We need to copy the AUTOINC value from the old table if
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	this is an ALTER TABLE or CREATE INDEX because CREATE INDEX
	does a table copy too. */
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	if (((create_info->used_fields & HA_CREATE_USED_AUTO)
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	    || thd_sql_command(thd) == SQLCOM_ALTER_TABLE
	    || thd_sql_command(thd) == SQLCOM_CREATE_INDEX)
	    && create_info->auto_increment_value > 0) {

		/* Query was one of :
		CREATE TABLE ...AUTO_INCREMENT = x; or
		ALTER TABLE...AUTO_INCREMENT = x;   or
		CREATE INDEX x on t(...);
		Find out a table definition from the dictionary and get
		the current value of the auto increment field. Set a new
		value to the auto increment field if the value is greater
		than the maximum value in the column. */
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		auto_inc_value = create_info->auto_increment_value;

		dict_table_autoinc_lock(innobase_table);
		dict_table_autoinc_initialize(innobase_table, auto_inc_value);
		dict_table_autoinc_unlock(innobase_table);
	}

	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

	trx_free_for_mysql(trx);

	DBUG_RETURN(0);

cleanup:
	innobase_commit_low(trx);

	row_mysql_unlock_data_dictionary(trx);

	trx_free_for_mysql(trx);

	DBUG_RETURN(error);
}

/*****************************************************************//**
Discards or imports an InnoDB tablespace.
@return	0 == success, -1 == error */
UNIV_INTERN
int
ha_innobase::discard_or_import_tablespace(
/*======================================*/
	my_bool discard)	/*!< in: TRUE if discard, else import */
{
	dict_table_t*	dict_table;
	trx_t*		trx;
	int		err;

	DBUG_ENTER("ha_innobase::discard_or_import_tablespace");

	ut_a(prebuilt->trx);
	ut_a(prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(prebuilt->trx == thd_to_trx(ha_thd()));

	dict_table = prebuilt->table;
	trx = prebuilt->trx;

	if (discard) {
		err = row_discard_tablespace_for_mysql(dict_table->name, trx);
	} else {
		err = row_import_tablespace_for_mysql(dict_table->name, trx);
	}

	err = convert_error_code_to_mysql(err, dict_table->flags, NULL);

	DBUG_RETURN(err);
}

/*****************************************************************//**
Deletes all rows of an InnoDB table.
@return	error number */
UNIV_INTERN
int
ha_innobase::delete_all_rows(void)
/*==============================*/
{
	int		error;

	DBUG_ENTER("ha_innobase::delete_all_rows");

	/* Get the transaction associated with the current thd, or create one
	if not yet created, and update prebuilt->trx */

	update_thd(ha_thd());

	if (thd_sql_command(user_thd) != SQLCOM_TRUNCATE) {
	fallback:
		/* We only handle TRUNCATE TABLE t as a special case.
		DELETE FROM t will have to use ha_innobase::delete_row(),
		because DELETE is transactional while TRUNCATE is not. */
		DBUG_RETURN(my_errno=HA_ERR_WRONG_COMMAND);
	}

	/* Truncate the table in InnoDB */

	error = row_truncate_table_for_mysql(prebuilt->table, prebuilt->trx);
	if (error == DB_ERROR) {
		/* Cannot truncate; resort to ha_innobase::delete_row() */
		goto fallback;
	}

	error = convert_error_code_to_mysql(error, prebuilt->table->flags,
					    NULL);

	DBUG_RETURN(error);
}

/*****************************************************************//**
Drops a table from an InnoDB database. Before calling this function,
MySQL calls innobase_commit to commit the transaction of the current user.
Then the current user cannot have locks set on the table. Drop table
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB.
@return	error number */
UNIV_INTERN
int
ha_innobase::delete_table(
/*======================*/
	const char*	name)	/*!< in: table name */
{
	ulint	name_len;
	int	error;
	trx_t*	parent_trx;
	trx_t*	trx;
	THD	*thd = ha_thd();
	char	norm_name[1000];

	DBUG_ENTER("ha_innobase::delete_table");

	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
	normalize_table_name(norm_name, name);

	if (IS_MAGIC_TABLE_AND_USER_DENIED_ACCESS(norm_name, thd)) {
		DBUG_RETURN(HA_ERR_GENERIC);
	}

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	parent_trx = check_trx_exists(thd);

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);

	trx = innobase_trx_allocate(thd);

	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

	name_len = strlen(name);

	ut_a(name_len < 1000);

	/* Drop the table in InnoDB */

	error = row_drop_table_for_mysql(norm_name, trx,
					 thd_sql_command(thd)
					 == SQLCOM_DROP_DB);

	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */

	log_buffer_flush_to_disk();

	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

	innobase_commit_low(trx);

	trx_free_for_mysql(trx);

	error = convert_error_code_to_mysql(error, 0, NULL);

	DBUG_RETURN(error);
}

/*****************************************************************//**
Removes all tables in the named database inside InnoDB. */
static
void
innobase_drop_database(
/*===================*/
	handlerton *hton, /*!< in: handlerton of Innodb */
	char*	path)	/*!< in: database path; inside InnoDB the name
			of the last directory in the path is used as
			the database name: for example, in 'mysql/data/test'
			the database name is 'test' */
{
	ulint	len		= 0;
	trx_t*	trx;
	char*	ptr;
	int	error;
	char*	namebuf;
	THD*	thd		= current_thd;

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* In the Windows plugin, thd = current_thd is always NULL */
	if (thd) {
		trx_t*	parent_trx = check_trx_exists(thd);

		/* In case MySQL calls this in the middle of a SELECT
		query, release possible adaptive hash latch to avoid
		deadlocks of threads */

		trx_search_latch_release_if_reserved(parent_trx);
	}

	ptr = strend(path) - 2;

	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
	namebuf = (char*) my_malloc((uint) len + 2, MYF(0));

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
#ifdef	__WIN__
	innobase_casedn_str(namebuf);
#endif
#if defined __WIN__ && !defined MYSQL_SERVER
	/* In the Windows plugin, thd = current_thd is always NULL */
	trx = trx_allocate_for_mysql();
	trx->mysql_thd = NULL;
	trx->mysql_query_str = NULL;
#else
	trx = innobase_trx_allocate(thd);
#endif
	error = row_drop_database_for_mysql(namebuf, trx);
	my_free(namebuf, MYF(0));

	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */

	log_buffer_flush_to_disk();

	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

	innobase_commit_low(trx);
	trx_free_for_mysql(trx);
}
/*********************************************************************//**
Renames an InnoDB table.
@return	0 or error code */
static
int
innobase_rename_table(
/*==================*/
	trx_t*		trx,	/*!< in: transaction */
	const char*	from,	/*!< in: old name of the table */
	const char*	to,	/*!< in: new name of the table */
	ibool		lock_and_commit)
				/*!< in: TRUE=lock data dictionary and commit */
{
	int	error;
	char*	norm_to;
	char*	norm_from;

	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

	// Magic number 64 arbitrary
	norm_to = (char*) my_malloc(strlen(to) + 64, MYF(0));
	norm_from = (char*) my_malloc(strlen(from) + 64, MYF(0));

	normalize_table_name(norm_to, to);
	normalize_table_name(norm_from, from);

	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

	if (lock_and_commit) {
		row_mysql_lock_data_dictionary(trx);
	}

	error = row_rename_table_for_mysql(
		norm_from, norm_to, trx, lock_and_commit);

	if (error != DB_SUCCESS) {
		FILE* ef = dict_foreign_err_file;

		fputs("InnoDB: Renaming table ", ef);
		ut_print_name(ef, trx, TRUE, norm_from);
		fputs(" to ", ef);
		ut_print_name(ef, trx, TRUE, norm_to);
		fputs(" failed!\n", ef);
	}

	if (lock_and_commit) {
		row_mysql_unlock_data_dictionary(trx);

		/* Flush the log to reduce probability that the .frm
		files and the InnoDB data dictionary get out-of-sync
		if the user runs with innodb_flush_log_at_trx_commit = 0 */

		log_buffer_flush_to_disk();
	}

	my_free(norm_to, MYF(0));
	my_free(norm_from, MYF(0));

	return error;
}
/*********************************************************************//**
Renames an InnoDB table.
@return	0 or error code */
UNIV_INTERN
int
ha_innobase::rename_table(
/*======================*/
	const char*	from,	/*!< in: old name of the table */
	const char*	to)	/*!< in: new name of the table */
{
	trx_t*	trx;
	int	error;
	trx_t*	parent_trx;
	THD*	thd		= ha_thd();

	DBUG_ENTER("ha_innobase::rename_table");

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	parent_trx = check_trx_exists(thd);

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);

	trx = innobase_trx_allocate(thd);

	error = innobase_rename_table(trx, from, to, TRUE);

	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

	innobase_commit_low(trx);
	trx_free_for_mysql(trx);

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	/* Add a special case to handle the Duplicated Key error
	and return DB_ERROR instead.
	This is to avoid a possible SIGSEGV error from mysql error
	handling code. Currently, mysql handles the Duplicated Key
	error by re-entering the storage layer and getting dup key
	info by calling get_dup_key(). This operation requires a valid
	table handle ('row_prebuilt_t' structure) which could no
	longer be available in the error handling stage. The suggested
	solution is to report a 'table exists' error message (since
	the dup key error here is due to an existing table whose name
	is the one we are trying to rename to) and return the generic
	error code. */
	if (error == (int) DB_DUPLICATE_KEY) {
		my_error(ER_TABLE_EXISTS_ERROR, MYF(0), to);

		error = DB_ERROR;
	}

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	error = convert_error_code_to_mysql(error, 0, NULL);

	DBUG_RETURN(error);
}

/*********************************************************************//**
Estimates the number of index records in a range.
@return	estimated number of rows */
UNIV_INTERN
ha_rows
ha_innobase::records_in_range(
/*==========================*/
	uint			keynr,		/*!< in: index number */
	key_range		*min_key,	/*!< in: start key value of the
						   range, may also be 0 */
	key_range		*max_key)	/*!< in: range end key val, may
						   also be 0 */
{
	KEY*		key;
	dict_index_t*	index;
	uchar*		key_val_buff2	= (uchar*) my_malloc(
						  table->s->reclength
					+ table->s->max_key_length + 100,
								MYF(MY_FAE));
	ulint		buff2_len = table->s->reclength
					+ table->s->max_key_length + 100;
	dtuple_t*	range_start;
	dtuple_t*	range_end;
	ib_int64_t	n_rows;
	ulint		mode1;
	ulint		mode2;
	mem_heap_t*	heap;

	DBUG_ENTER("records_in_range");

	ut_a(prebuilt->trx == thd_to_trx(ha_thd()));

	prebuilt->trx->op_info = (char*)"estimating records in index range";

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);

	active_index = keynr;

	key = table->key_info + active_index;

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	index = innobase_get_index(keynr);

	ut_a(ut_strcmp(index->name, key->name) == 0);
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	/* MySQL knows about this index and so we must be able to find it.*/
	ut_a(index);

	heap = mem_heap_create(2 * (key->key_parts * sizeof(dfield_t)
				    + sizeof(dtuple_t)));

	range_start = dtuple_create(heap, key->key_parts);
	dict_index_copy_types(range_start, index, key->key_parts);

	range_end = dtuple_create(heap, key->key_parts);
	dict_index_copy_types(range_end, index, key->key_parts);

	row_sel_convert_mysql_key_to_innobase(
				range_start, (byte*) key_val_buff,
				(ulint)upd_and_key_val_buff_len,
				index,
				(byte*) (min_key ? min_key->key :
					 (const uchar*) 0),
				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);

	row_sel_convert_mysql_key_to_innobase(
				range_end, (byte*) key_val_buff2,
				buff2_len, index,
				(byte*) (max_key ? max_key->key :
					 (const uchar*) 0),
				(ulint) (max_key ? max_key->length : 0),
				prebuilt->trx);

	mode1 = convert_search_mode_to_innobase(min_key ? min_key->flag :
						HA_READ_KEY_EXACT);
	mode2 = convert_search_mode_to_innobase(max_key ? max_key->flag :
						HA_READ_KEY_EXACT);

	if (mode1 != PAGE_CUR_UNSUPP && mode2 != PAGE_CUR_UNSUPP) {

		n_rows = btr_estimate_n_rows_in_range(index, range_start,
						      mode1, range_end,
						      mode2);
	} else {

		n_rows = HA_POS_ERROR;
	}

	mem_heap_free(heap);

	my_free(key_val_buff2, MYF(0));

	prebuilt->trx->op_info = (char*)"";

	/* The MySQL optimizer seems to believe an estimate of 0 rows is
	always accurate and may return the result 'Empty set' based on that.
	The accuracy is not guaranteed, and even if it were, for a locking
	read we should anyway perform the search to set the next-key lock.
	Add 1 to the value to make sure MySQL does not make the assumption! */

	if (n_rows == 0) {
		n_rows = 1;
	}

	DBUG_RETURN((ha_rows) n_rows);
}

/*********************************************************************//**
Gives an UPPER BOUND to the number of rows in a table. This is used in
filesort.cc.
@return	upper bound of rows */
UNIV_INTERN
ha_rows
ha_innobase::estimate_rows_upper_bound(void)
/*======================================*/
{
	dict_index_t*	index;
	ulonglong	estimate;
	ulonglong	local_data_file_length;

	DBUG_ENTER("estimate_rows_upper_bound");

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(ha_thd());

	prebuilt->trx->op_info = (char*)
				 "calculating upper bound for table rows";

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);

	index = dict_table_get_first_index(prebuilt->table);

	ut_a(index->stat_n_leaf_pages > 0);

	local_data_file_length =
		((ulonglong) index->stat_n_leaf_pages) * UNIV_PAGE_SIZE;


	/* Calculate a minimum length for a clustered index record and from
	that an upper bound for the number of rows. Since we only calculate
	new statistics in row0mysql.c when a table has grown by a threshold
	factor, we must add a safety factor 2 in front of the formula below. */

	estimate = 2 * local_data_file_length /
					 dict_index_calc_min_rec_len(index);

	prebuilt->trx->op_info = (char*)"";

	DBUG_RETURN((ha_rows) estimate);
}

/*********************************************************************//**
How many seeks it will take to read through the table. This is to be
comparable to the number returned by records_in_range so that we can
decide if we should scan the table or use keys.
@return	estimated time measured in disk seeks */
UNIV_INTERN
double
ha_innobase::scan_time()
/*====================*/
{
	/* Since MySQL seems to favor table scans too much over index
	searches, we pretend that a sequential read takes the same time
	as a random disk read, that is, we do not divide the following
	by 10, which would be physically realistic. */

	return((double) (prebuilt->table->stat_clustered_index_size));
}

/******************************************************************//**
Calculate the time it takes to read a set of ranges through an index
This enables us to optimise reads for clustered indexes.
@return	estimated time measured in disk seeks */
UNIV_INTERN
double
ha_innobase::read_time(
/*===================*/
	uint	index,	/*!< in: key number */
	uint	ranges,	/*!< in: how many ranges */
	ha_rows rows)	/*!< in: estimated number of rows in the ranges */
{
	ha_rows total_rows;
	double	time_for_scan;

	if (index != table->s->primary_key) {
		/* Not clustered */
		return(handler::read_time(index, ranges, rows));
	}

	if (rows <= 2) {

		return((double) rows);
	}

	/* Assume that the read time is proportional to the scan time for all
	rows + at most one seek per range. */

	time_for_scan = scan_time();

	if ((total_rows = estimate_rows_upper_bound()) < rows) {

		return(time_for_scan);
	}

	return(ranges + (double) rows / (double) total_rows * time_for_scan);
}

/*********************************************************************//**
Returns statistics information of the table to the MySQL interpreter,
in various fields of the handle object. */
UNIV_INTERN
int
ha_innobase::info(
/*==============*/
	uint flag)	/*!< in: what information MySQL requests */
{
	dict_table_t*	ib_table;
	dict_index_t*	index;
	ha_rows		rec_per_key;
	ib_int64_t	n_rows;
	ulong		j;
	ulong		i;
	char		path[FN_REFLEN];
	os_file_stat_t	stat_info;

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	DBUG_ENTER("info");

	/* If we are forcing recovery at a high level, we will suppress
	statistics calculation on tables, because that may crash the
	server if an index is badly corrupted. */

	if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {

		/* We return success (0) instead of HA_ERR_CRASHED,
		because we want MySQL to process this query and not
		stop, like it would do if it received the error code
		HA_ERR_CRASHED. */

		DBUG_RETURN(0);
	}

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(ha_thd());

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	prebuilt->trx->op_info = (char*)"returning various info to MySQL";

	trx_search_latch_release_if_reserved(prebuilt->trx);

	ib_table = prebuilt->table;

	if (flag & HA_STATUS_TIME) {
		if (innobase_stats_on_metadata) {
			/* In sql_show we call with this flag: update
			then statistics so that they are up-to-date */

			prebuilt->trx->op_info = "updating table statistics";

			dict_update_statistics(ib_table);

			prebuilt->trx->op_info = "returning various info to MySQL";
		}

		my_snprintf(path, sizeof(path), "%s/%s%s",
				mysql_data_home, ib_table->name, reg_ext);

		unpack_filename(path,path);

		/* Note that we do not know the access time of the table,
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

		if (os_file_get_status(path,&stat_info)) {
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Sergey Vojtovich committed
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			stats.create_time = (ulong) stat_info.ctime;
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		}
	}

	if (flag & HA_STATUS_VARIABLE) {
		n_rows = ib_table->stat_n_rows;

		/* Because we do not protect stat_n_rows by any mutex in a
		delete, it is theoretically possible that the value can be
		smaller than zero! TODO: fix this race.

		The MySQL optimizer seems to assume in a left join that n_rows
		is an accurate estimate if it is zero. Of course, it is not,
		since we do not have any locks on the rows yet at this phase.
		Since SHOW TABLE STATUS seems to call this function with the
		HA_STATUS_TIME flag set, while the left join optimizer does not
		set that flag, we add one to a zero value if the flag is not
		set. That way SHOW TABLE STATUS will show the best estimate,
		while the optimizer never sees the table empty. */

		if (n_rows < 0) {
			n_rows = 0;
		}

		if (n_rows == 0 && !(flag & HA_STATUS_TIME)) {
			n_rows++;
		}

		/* Fix bug#40386: Not flushing query cache after truncate.
		n_rows can not be 0 unless the table is empty, set to 1
		instead. The original problem of bug#29507 is actually
		fixed in the server code. */
		if (thd_sql_command(user_thd) == SQLCOM_TRUNCATE) {

			n_rows = 1;

			/* We need to reset the prebuilt value too, otherwise
			checks for values greater than the last value written
			to the table will fail and the autoinc counter will
			not be updated. This will force write_row() into
			attempting an update of the table's AUTOINC counter. */

			prebuilt->autoinc_last_value = 0;
		}

		stats.records = (ha_rows)n_rows;
		stats.deleted = 0;
		stats.data_file_length = ((ulonglong)
				ib_table->stat_clustered_index_size)
					* UNIV_PAGE_SIZE;
		stats.index_file_length = ((ulonglong)
				ib_table->stat_sum_of_other_index_sizes)
					* UNIV_PAGE_SIZE;

		/* Since fsp_get_available_space_in_free_extents() is
		acquiring latches inside InnoDB, we do not call it if we
		are asked by MySQL to avoid locking. Another reason to
		avoid the call is that it uses quite a lot of CPU.
		See Bug#38185.
		We do not update delete_length if no locking is requested
		so the "old" value can remain. delete_length is initialized
		to 0 in the ha_statistics' constructor. */
		if (!(flag & HA_STATUS_NO_LOCK)) {

			/* lock the data dictionary to avoid races with
			ibd_file_missing and tablespace_discarded */
			row_mysql_lock_data_dictionary(prebuilt->trx);

			/* ib_table->space must be an existent tablespace */
			if (!ib_table->ibd_file_missing
			    && !ib_table->tablespace_discarded) {

				stats.delete_length =
					fsp_get_available_space_in_free_extents(
						ib_table->space) * 1024;
			} else {

				THD*	thd;

				thd = ha_thd();

				push_warning_printf(
					thd,
					MYSQL_ERROR::WARN_LEVEL_WARN,
					ER_CANT_GET_STAT,
					"InnoDB: Trying to get the free "
					"space for table %s but its "
					"tablespace has been discarded or "
					"the .ibd file is missing. Setting "
					"the free space to zero.",
					ib_table->name);

				stats.delete_length = 0;
			}

			row_mysql_unlock_data_dictionary(prebuilt->trx);
		}

		stats.check_time = 0;

		if (stats.records == 0) {
			stats.mean_rec_length = 0;
		} else {
			stats.mean_rec_length = (ulong) (stats.data_file_length / stats.records);
		}
	}

	if (flag & HA_STATUS_CONST) {
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		/* Verify the number of index in InnoDB and MySQL
		matches up. If prebuilt->clust_index_was_generated
		holds, InnoDB defines GEN_CLUST_INDEX internally */
		ulint	num_innodb_index = UT_LIST_GET_LEN(ib_table->indexes)
					- prebuilt->clust_index_was_generated;

		if (table->s->keys != num_innodb_index) {
			sql_print_error("Table %s contains %lu "
					"indexes inside InnoDB, which "
					"is different from the number of "
					"indexes %u defined in the MySQL ",
					ib_table->name, num_innodb_index,
					table->s->keys);
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		}

		for (i = 0; i < table->s->keys; i++) {
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			/* We could get index quickly through internal
			index mapping with the index translation table.
			The identity of index (match up index name with
			that of table->key_info[i]) is already verified in
			innobase_get_index().  */
			index = innobase_get_index(i);

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			if (index == NULL) {
				sql_print_error("Table %s contains fewer "
						"indexes inside InnoDB than "
						"are defined in the MySQL "
						".frm file. Have you mixed up "
						".frm files from different "
						"installations? See "
						REFMAN
						"innodb-troubleshooting.html\n",
						ib_table->name);
				break;
			}

			for (j = 0; j < table->key_info[i].key_parts; j++) {

				if (j + 1 > index->n_uniq) {
					sql_print_error(
"Index %s of %s has %lu columns unique inside InnoDB, but MySQL is asking "
"statistics for %lu columns. Have you mixed up .frm files from different "
"installations? "
"See " REFMAN "innodb-troubleshooting.html\n",
							index->name,
							ib_table->name,
							(unsigned long)
							index->n_uniq, j + 1);
					break;
				}

				if (index->stat_n_diff_key_vals[j + 1] == 0) {

					rec_per_key = stats.records;
				} else {
					rec_per_key = (ha_rows)(stats.records /
					 index->stat_n_diff_key_vals[j + 1]);
				}

				/* Since MySQL seems to favor table scans
				too much over index searches, we pretend
				index selectivity is 2 times better than
				our estimate: */

				rec_per_key = rec_per_key / 2;

				if (rec_per_key == 0) {
					rec_per_key = 1;
				}

				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  (ulong) rec_per_key;
			}
		}
	}

	if (flag & HA_STATUS_ERRKEY) {
		const dict_index_t*	err_index;

		ut_a(prebuilt->trx);
		ut_a(prebuilt->trx->magic_n == TRX_MAGIC_N);

		err_index = trx_get_error_info(prebuilt->trx);

		if (err_index) {
			errkey = (unsigned int)
				row_get_mysql_key_number_for_index(err_index);
		} else {
			errkey = (unsigned int) prebuilt->trx->error_key_num;
		}
	}

	if ((flag & HA_STATUS_AUTO) && table->found_next_number_field) {
		stats.auto_increment_value = innobase_peek_autoinc();
	}

	prebuilt->trx->op_info = (char*)"";

	DBUG_RETURN(0);
}

/**********************************************************************//**
Updates index cardinalities of the table, based on 8 random dives into
each index tree. This does NOT calculate exact statistics on the table.
@return	returns always 0 (success) */
UNIV_INTERN
int
ha_innobase::analyze(
/*=================*/
	THD*		thd,		/*!< in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/*!< in: currently ignored */
{
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	/* Serialize ANALYZE TABLE inside InnoDB, see
	Bug#38996 Race condition in ANALYZE TABLE */
	pthread_mutex_lock(&analyze_mutex);

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	/* Simply call ::info() with all the flags */
	info(HA_STATUS_TIME | HA_STATUS_CONST | HA_STATUS_VARIABLE);

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	pthread_mutex_unlock(&analyze_mutex);

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	return(0);
}

/**********************************************************************//**
This is mapped to "ALTER TABLE tablename ENGINE=InnoDB", which rebuilds
the table in MySQL. */
UNIV_INTERN
int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/*!< in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/*!< in: currently ignored */
{
	return(HA_ADMIN_TRY_ALTER);
}

/*******************************************************************//**
Tries to check that an InnoDB table is not corrupted. If corruption is
noticed, prints to stderr information about it. In case of corruption
may also assert a failure and crash the server.
@return	HA_ADMIN_CORRUPT or HA_ADMIN_OK */
UNIV_INTERN
int
ha_innobase::check(
/*===============*/
	THD*		thd,		/*!< in: user thread handle */
	HA_CHECK_OPT*	check_opt)	/*!< in: check options, currently
					ignored */
{
	ulint		ret;

	DBUG_ASSERT(thd == ha_thd());
	ut_a(prebuilt->trx);
	ut_a(prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(prebuilt->trx == thd_to_trx(thd));

	if (prebuilt->mysql_template == NULL) {
		/* Build the template; we will use a dummy template
		in index scans done in checking */

		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}

	ret = row_check_table_for_mysql(prebuilt);

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	switch (ret) {
	case DB_SUCCESS:
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		return(HA_ADMIN_OK);
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	case DB_INTERRUPTED:
		my_error(ER_QUERY_INTERRUPTED, MYF(0));
		return(-1);
	default:
		return(HA_ADMIN_CORRUPT);
7639 7640 7641 7642 7643 7644 7645 7646 7647 7648 7649 7650 7651 7652 7653 7654 7655 7656 7657 7658 7659 7660 7661 7662 7663 7664 7665 7666 7667 7668 7669 7670 7671 7672 7673 7674 7675 7676 7677 7678 7679 7680 7681 7682 7683 7684 7685 7686 7687 7688 7689 7690 7691 7692 7693 7694 7695 7696 7697 7698 7699 7700 7701 7702 7703 7704 7705 7706 7707 7708 7709 7710 7711 7712 7713 7714 7715 7716 7717 7718 7719 7720 7721 7722 7723 7724 7725 7726 7727 7728 7729 7730 7731 7732 7733 7734 7735 7736 7737 7738 7739 7740 7741 7742 7743 7744 7745 7746 7747 7748 7749 7750 7751 7752 7753 7754 7755 7756 7757 7758 7759 7760 7761 7762 7763 7764 7765 7766 7767 7768 7769 7770 7771 7772 7773 7774 7775 7776 7777 7778 7779 7780 7781 7782 7783 7784 7785 7786 7787 7788 7789 7790 7791 7792 7793 7794 7795 7796 7797 7798 7799 7800 7801 7802 7803 7804 7805 7806 7807 7808 7809 7810 7811 7812 7813 7814 7815 7816 7817 7818 7819 7820 7821 7822 7823 7824 7825 7826 7827 7828 7829 7830 7831 7832 7833 7834 7835 7836 7837 7838 7839 7840 7841 7842 7843 7844 7845 7846 7847 7848 7849 7850 7851 7852 7853 7854 7855 7856 7857 7858 7859 7860 7861 7862 7863 7864 7865 7866 7867 7868 7869 7870 7871 7872 7873 7874 7875 7876 7877 7878 7879 7880 7881 7882 7883 7884 7885 7886 7887 7888 7889 7890 7891 7892 7893 7894 7895 7896 7897 7898 7899 7900 7901 7902 7903 7904 7905 7906 7907 7908 7909 7910 7911 7912 7913 7914 7915 7916 7917 7918 7919 7920 7921 7922 7923 7924 7925 7926 7927 7928 7929 7930 7931 7932 7933 7934 7935 7936 7937 7938 7939 7940 7941 7942 7943 7944 7945 7946 7947 7948 7949 7950 7951 7952 7953 7954 7955 7956 7957 7958 7959 7960 7961 7962 7963 7964 7965 7966 7967 7968 7969 7970 7971 7972 7973 7974 7975 7976 7977 7978 7979 7980 7981 7982 7983 7984 7985 7986 7987 7988 7989 7990 7991 7992 7993 7994 7995 7996 7997 7998 7999 8000 8001 8002 8003 8004 8005 8006 8007 8008 8009 8010 8011 8012 8013 8014 8015 8016 8017 8018 8019 8020 8021 8022 8023 8024 8025 8026 8027 8028 8029 8030 8031 8032 8033 8034 8035 8036 8037 8038 8039 8040 8041 8042 8043 8044 8045 8046 8047 8048 8049 8050 8051 8052 8053 8054 8055 8056 8057 8058 8059 8060 8061 8062 8063 8064 8065 8066 8067 8068 8069 8070 8071 8072 8073 8074 8075 8076 8077 8078 8079 8080 8081 8082 8083 8084 8085 8086 8087 8088 8089 8090 8091 8092 8093 8094 8095 8096 8097 8098 8099 8100 8101 8102 8103 8104 8105 8106 8107 8108 8109 8110 8111 8112 8113 8114 8115 8116 8117 8118 8119 8120 8121 8122 8123 8124 8125 8126 8127 8128 8129 8130 8131 8132 8133 8134 8135 8136 8137 8138 8139 8140 8141 8142 8143 8144 8145 8146 8147 8148 8149 8150 8151 8152 8153 8154 8155 8156 8157 8158 8159 8160 8161 8162 8163 8164 8165 8166 8167 8168 8169 8170 8171 8172 8173 8174 8175 8176 8177 8178 8179 8180 8181 8182 8183
	}
}

/*************************************************************//**
Adds information about free space in the InnoDB tablespace to a table comment
which is printed out when a user calls SHOW TABLE STATUS. Adds also info on
foreign keys.
@return	table comment + InnoDB free space + info on foreign keys */
UNIV_INTERN
char*
ha_innobase::update_table_comment(
/*==============================*/
	const char*	comment)/*!< in: table comment defined by user */
{
	uint	length = (uint) strlen(comment);
	char*	str;
	long	flen;

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	if (length > 64000 - 3) {
		return((char*)comment); /* string too long */
	}

	update_thd(ha_thd());

	prebuilt->trx->op_info = (char*)"returning table comment";

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
	str = NULL;

	/* output the data to a temporary file */

	mutex_enter(&srv_dict_tmpfile_mutex);
	rewind(srv_dict_tmpfile);

	fprintf(srv_dict_tmpfile, "InnoDB free: %llu kB",
		fsp_get_available_space_in_free_extents(
			prebuilt->table->space));

	dict_print_info_on_foreign_keys(FALSE, srv_dict_tmpfile,
				prebuilt->trx, prebuilt->table);
	flen = ftell(srv_dict_tmpfile);
	if (flen < 0) {
		flen = 0;
	} else if (length + flen + 3 > 64000) {
		flen = 64000 - 3 - length;
	}

	/* allocate buffer for the full string, and
	read the contents of the temporary file */

	str = (char*) my_malloc(length + flen + 3, MYF(0));

	if (str) {
		char* pos	= str + length;
		if (length) {
			memcpy(str, comment, length);
			*pos++ = ';';
			*pos++ = ' ';
		}
		rewind(srv_dict_tmpfile);
		flen = (uint) fread(pos, 1, flen, srv_dict_tmpfile);
		pos[flen] = 0;
	}

	mutex_exit(&srv_dict_tmpfile_mutex);

	prebuilt->trx->op_info = (char*)"";

	return(str ? str : (char*) comment);
}

/*******************************************************************//**
Gets the foreign key create info for a table stored in InnoDB.
@return own: character string in the form which can be inserted to the
CREATE TABLE statement, MUST be freed with
ha_innobase::free_foreign_key_create_info */
UNIV_INTERN
char*
ha_innobase::get_foreign_key_create_info(void)
/*==========================================*/
{
	char*	str	= 0;
	long	flen;

	ut_a(prebuilt != NULL);

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(ha_thd());

	prebuilt->trx->op_info = (char*)"getting info on foreign keys";

	/* In case MySQL calls this in the middle of a SELECT query,
	release possible adaptive hash latch to avoid
	deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);

	mutex_enter(&srv_dict_tmpfile_mutex);
	rewind(srv_dict_tmpfile);

	/* output the data to a temporary file */
	dict_print_info_on_foreign_keys(TRUE, srv_dict_tmpfile,
				prebuilt->trx, prebuilt->table);
	prebuilt->trx->op_info = (char*)"";

	flen = ftell(srv_dict_tmpfile);
	if (flen < 0) {
		flen = 0;
	} else if (flen > 64000 - 1) {
		flen = 64000 - 1;
	}

	/* allocate buffer for the string, and
	read the contents of the temporary file */

	str = (char*) my_malloc(flen + 1, MYF(0));

	if (str) {
		rewind(srv_dict_tmpfile);
		flen = (uint) fread(str, 1, flen, srv_dict_tmpfile);
		str[flen] = 0;
	}

	mutex_exit(&srv_dict_tmpfile_mutex);

	return(str);
}


UNIV_INTERN
int
ha_innobase::get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
{
  dict_foreign_t* foreign;

  DBUG_ENTER("get_foreign_key_list");
  ut_a(prebuilt != NULL);
  update_thd(ha_thd());
  prebuilt->trx->op_info = (char*)"getting list of foreign keys";
  trx_search_latch_release_if_reserved(prebuilt->trx);
  mutex_enter(&(dict_sys->mutex));
  foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);

  while (foreign != NULL) {
	  uint i;
	  FOREIGN_KEY_INFO f_key_info;
	  LEX_STRING *name= 0;
          uint ulen;
          char uname[NAME_LEN+1];           /* Unencoded name */
          char db_name[NAME_LEN+1];
	  const char *tmp_buff;

	  tmp_buff= foreign->id;
	  i= 0;
	  while (tmp_buff[i] != '/')
		  i++;
	  tmp_buff+= i + 1;
	  f_key_info.forein_id = thd_make_lex_string(thd, 0,
		  tmp_buff, (uint) strlen(tmp_buff), 1);
	  tmp_buff= foreign->referenced_table_name;

          /* Database name */
	  i= 0;
	  while (tmp_buff[i] != '/')
          {
            db_name[i]= tmp_buff[i];
            i++;
          }
          db_name[i]= 0;
          ulen= filename_to_tablename(db_name, uname, sizeof(uname));
	  f_key_info.referenced_db = thd_make_lex_string(thd, 0,
		  uname, ulen, 1);

          /* Table name */
	  tmp_buff+= i + 1;
          ulen= filename_to_tablename(tmp_buff, uname, sizeof(uname));
	  f_key_info.referenced_table = thd_make_lex_string(thd, 0,
		  uname, ulen, 1);

	  for (i= 0;;) {
		  tmp_buff= foreign->foreign_col_names[i];
		  name = thd_make_lex_string(thd, name,
			  tmp_buff, (uint) strlen(tmp_buff), 1);
		  f_key_info.foreign_fields.push_back(name);
		  tmp_buff= foreign->referenced_col_names[i];
		  name = thd_make_lex_string(thd, name,
			tmp_buff, (uint) strlen(tmp_buff), 1);
		  f_key_info.referenced_fields.push_back(name);
		  if (++i >= foreign->n_fields)
			  break;
	  }

          ulong length;
          if (foreign->type & DICT_FOREIGN_ON_DELETE_CASCADE)
          {
            length=7;
            tmp_buff= "CASCADE";
          }
          else if (foreign->type & DICT_FOREIGN_ON_DELETE_SET_NULL)
          {
            length=8;
            tmp_buff= "SET NULL";
          }
          else if (foreign->type & DICT_FOREIGN_ON_DELETE_NO_ACTION)
          {
            length=9;
            tmp_buff= "NO ACTION";
          }
          else
          {
            length=8;
            tmp_buff= "RESTRICT";
          }
	  f_key_info.delete_method = thd_make_lex_string(
		  thd, f_key_info.delete_method, tmp_buff, length, 1);


          if (foreign->type & DICT_FOREIGN_ON_UPDATE_CASCADE)
          {
            length=7;
            tmp_buff= "CASCADE";
          }
          else if (foreign->type & DICT_FOREIGN_ON_UPDATE_SET_NULL)
          {
            length=8;
            tmp_buff= "SET NULL";
          }
          else if (foreign->type & DICT_FOREIGN_ON_UPDATE_NO_ACTION)
          {
            length=9;
            tmp_buff= "NO ACTION";
          }
          else
          {
            length=8;
            tmp_buff= "RESTRICT";
          }
	  f_key_info.update_method = thd_make_lex_string(
		  thd, f_key_info.update_method, tmp_buff, length, 1);
          if (foreign->referenced_index &&
              foreign->referenced_index->name)
          {
	    f_key_info.referenced_key_name = thd_make_lex_string(
		    thd, f_key_info.referenced_key_name,
		    foreign->referenced_index->name,
		    (uint) strlen(foreign->referenced_index->name), 1);
          }
          else
            f_key_info.referenced_key_name= 0;

	  FOREIGN_KEY_INFO *pf_key_info = (FOREIGN_KEY_INFO *)
		  thd_memdup(thd, &f_key_info, sizeof(FOREIGN_KEY_INFO));
	  f_key_list->push_back(pf_key_info);
	  foreign = UT_LIST_GET_NEXT(foreign_list, foreign);
  }
  mutex_exit(&(dict_sys->mutex));
  prebuilt->trx->op_info = (char*)"";

  DBUG_RETURN(0);
}

/*****************************************************************//**
Checks if ALTER TABLE may change the storage engine of the table.
Changing storage engines is not allowed for tables for which there
are foreign key constraints (parent or child tables).
@return	TRUE if can switch engines */
UNIV_INTERN
bool
ha_innobase::can_switch_engines(void)
/*=================================*/
{
	bool	can_switch;

	DBUG_ENTER("ha_innobase::can_switch_engines");

	ut_a(prebuilt->trx == thd_to_trx(ha_thd()));

	prebuilt->trx->op_info =
			"determining if there are foreign key constraints";
	row_mysql_lock_data_dictionary(prebuilt->trx);

	can_switch = !UT_LIST_GET_FIRST(prebuilt->table->referenced_list)
			&& !UT_LIST_GET_FIRST(prebuilt->table->foreign_list);

	row_mysql_unlock_data_dictionary(prebuilt->trx);
	prebuilt->trx->op_info = "";

	DBUG_RETURN(can_switch);
}

/*******************************************************************//**
Checks if a table is referenced by a foreign key. The MySQL manual states that
a REPLACE is either equivalent to an INSERT, or DELETE(s) + INSERT. Only a
delete is then allowed internally to resolve a duplicate key conflict in
REPLACE, not an update.
@return	> 0 if referenced by a FOREIGN KEY */
UNIV_INTERN
uint
ha_innobase::referenced_by_foreign_key(void)
/*========================================*/
{
	if (dict_table_is_referenced_by_foreign_key(prebuilt->table)) {

		return(1);
	}

	return(0);
}

/*******************************************************************//**
Frees the foreign key create info for a table stored in InnoDB, if it is
non-NULL. */
UNIV_INTERN
void
ha_innobase::free_foreign_key_create_info(
/*======================================*/
	char*	str)	/*!< in, own: create info string to free */
{
	if (str) {
		my_free(str, MYF(0));
	}
}

/*******************************************************************//**
Tells something additional to the handler about how to do things.
@return	0 or error number */
UNIV_INTERN
int
ha_innobase::extra(
/*===============*/
	enum ha_extra_function operation)
			   /*!< in: HA_EXTRA_FLUSH or some other flag */
{
	/* Warning: since it is not sure that MySQL calls external_lock
	before calling this function, the trx field in prebuilt can be
	obsolete! */

	switch (operation) {
		case HA_EXTRA_FLUSH:
			if (prebuilt->blob_heap) {
				row_mysql_prebuilt_free_blob_heap(prebuilt);
			}
			break;
		case HA_EXTRA_RESET_STATE:
			reset_template(prebuilt);
			break;
		case HA_EXTRA_NO_KEYREAD:
			prebuilt->read_just_key = 0;
			break;
		case HA_EXTRA_KEYREAD:
			prebuilt->read_just_key = 1;
			break;
		case HA_EXTRA_KEYREAD_PRESERVE_FIELDS:
			prebuilt->keep_other_fields_on_keyread = 1;
			break;

			/* IMPORTANT: prebuilt->trx can be obsolete in
			this method, because it is not sure that MySQL
			calls external_lock before this method with the
			parameters below.  We must not invoke update_thd()
			either, because the calling threads may change.
			CAREFUL HERE, OR MEMORY CORRUPTION MAY OCCUR! */
		case HA_EXTRA_IGNORE_DUP_KEY:
			thd_to_trx(ha_thd())->duplicates |= TRX_DUP_IGNORE;
			break;
		case HA_EXTRA_WRITE_CAN_REPLACE:
			thd_to_trx(ha_thd())->duplicates |= TRX_DUP_REPLACE;
			break;
		case HA_EXTRA_WRITE_CANNOT_REPLACE:
			thd_to_trx(ha_thd())->duplicates &= ~TRX_DUP_REPLACE;
			break;
		case HA_EXTRA_NO_IGNORE_DUP_KEY:
			thd_to_trx(ha_thd())->duplicates &=
				~(TRX_DUP_IGNORE | TRX_DUP_REPLACE);
			break;
		default:/* Do nothing */
			;
	}

	return(0);
}

UNIV_INTERN
int
ha_innobase::reset()
{
	if (prebuilt->blob_heap) {
		row_mysql_prebuilt_free_blob_heap(prebuilt);
	}

	reset_template(prebuilt);

	/* TODO: This should really be reset in reset_template() but for now
	it's safer to do it explicitly here. */

	/* This is a statement level counter. */
	prebuilt->autoinc_last_value = 0;

	return(0);
}

/******************************************************************//**
MySQL calls this function at the start of each SQL statement inside LOCK
TABLES. Inside LOCK TABLES the ::external_lock method does not work to
mark SQL statement borders. Note also a special case: if a temporary table
is created inside LOCK TABLES, MySQL has not called external_lock() at all
on that table.
MySQL-5.0 also calls this before each statement in an execution of a stored
procedure. To make the execution more deterministic for binlogging, MySQL-5.0
locks all tables involved in a stored procedure with full explicit table
locks (thd_in_lock_tables(thd) holds in store_lock()) before executing the
procedure.
@return	0 or error code */
UNIV_INTERN
int
ha_innobase::start_stmt(
/*====================*/
	THD*		thd,	/*!< in: handle to the user thread */
	thr_lock_type	lock_type)
{
	trx_t*		trx;

	update_thd(thd);

	trx = prebuilt->trx;

	/* Here we release the search latch and the InnoDB thread FIFO ticket
	if they were reserved. They should have been released already at the
	end of the previous statement, but because inside LOCK TABLES the
	lock count method does not work to mark the end of a SELECT statement,
	that may not be the case. We MUST release the search latch before an
	INSERT, for example. */

	innobase_release_stat_resources(trx);

	/* Reset the AUTOINC statement level counter for multi-row INSERTs. */
	trx->n_autoinc_rows = 0;

	prebuilt->sql_stat_start = TRUE;
	prebuilt->hint_need_to_fetch_extra_cols = 0;
	reset_template(prebuilt);

	if (!prebuilt->mysql_has_locked) {
		/* This handle is for a temporary table created inside
		this same LOCK TABLES; since MySQL does NOT call external_lock
		in this case, we must use x-row locks inside InnoDB to be
		prepared for an update of a row */

		prebuilt->select_lock_type = LOCK_X;
	} else {
		if (trx->isolation_level != TRX_ISO_SERIALIZABLE
			&& thd_sql_command(thd) == SQLCOM_SELECT
			&& lock_type == TL_READ) {

			/* For other than temporary tables, we obtain
			no lock for consistent read (plain SELECT). */

			prebuilt->select_lock_type = LOCK_NONE;
		} else {
			/* Not a consistent read: restore the
			select_lock_type value. The value of
			stored_select_lock_type was decided in:
			1) ::store_lock(),
			2) ::external_lock(),
			3) ::init_table_handle_for_HANDLER(), and
			4) ::transactional_table_lock(). */

			prebuilt->select_lock_type =
				prebuilt->stored_select_lock_type;
		}
	}

	trx->detailed_error[0] = '\0';

	/* Set the MySQL flag to mark that there is an active transaction */
	if (trx->active_trans == 0) {

		innobase_register_trx_and_stmt(ht, thd);
		trx->active_trans = 1;
	} else {
		innobase_register_stmt(ht, thd);
	}

	return(0);
}

/******************************************************************//**
Maps a MySQL trx isolation level code to the InnoDB isolation level code
@return	InnoDB isolation level */
static inline
ulint
innobase_map_isolation_level(
/*=========================*/
	enum_tx_isolation	iso)	/*!< in: MySQL isolation level code */
{
	switch(iso) {
		case ISO_REPEATABLE_READ: return(TRX_ISO_REPEATABLE_READ);
		case ISO_READ_COMMITTED: return(TRX_ISO_READ_COMMITTED);
		case ISO_SERIALIZABLE: return(TRX_ISO_SERIALIZABLE);
		case ISO_READ_UNCOMMITTED: return(TRX_ISO_READ_UNCOMMITTED);
		default: ut_a(0); return(0);
	}
}

/******************************************************************//**
As MySQL will execute an external lock for every new table it uses when it
starts to process an SQL statement (an exception is when MySQL calls
start_stmt for the handle) we can use this function to store the pointer to
the THD in the handle. We will also use this function to communicate
to InnoDB that a new SQL statement has started and that we must store a
savepoint to our transaction handle, so that we are able to roll back
the SQL statement in case of an error.
@return	0 */
UNIV_INTERN
int
ha_innobase::external_lock(
/*=======================*/
	THD*	thd,		/*!< in: handle to the user thread */
	int	lock_type)	/*!< in: lock type */
{
	trx_t*		trx;

	DBUG_ENTER("ha_innobase::external_lock");
	DBUG_PRINT("enter",("lock_type: %d", lock_type));

	update_thd(thd);

	/* Statement based binlogging does not work in isolation level
	READ UNCOMMITTED and READ COMMITTED since the necessary
	locks cannot be taken. In this case, we print an
	informative error message and return with an error. */
	if (lock_type == F_WRLCK)
	{
		ulong const binlog_format= thd_binlog_format(thd);
		ulong const tx_isolation = thd_tx_isolation(ha_thd());
8184 8185
		if (tx_isolation <= ISO_READ_COMMITTED
                   && binlog_format == BINLOG_FORMAT_STMT
8186 8187 8188 8189
#if MYSQL_VERSION_ID > 50140
                   && thd_binlog_filter_ok(thd)
#endif /* MYSQL_VERSION_ID > 50140 */
		   )
8190 8191 8192 8193 8194 8195 8196 8197 8198 8199 8200 8201 8202 8203 8204 8205 8206 8207 8208 8209 8210 8211 8212 8213 8214 8215 8216 8217 8218 8219 8220 8221 8222 8223 8224 8225 8226 8227 8228 8229 8230 8231 8232 8233 8234 8235 8236 8237 8238 8239 8240 8241 8242 8243 8244 8245 8246 8247 8248 8249 8250 8251 8252 8253 8254 8255 8256 8257 8258 8259 8260 8261 8262 8263 8264 8265 8266 8267 8268 8269 8270 8271 8272 8273 8274 8275 8276 8277 8278 8279 8280 8281 8282 8283 8284 8285 8286 8287 8288 8289 8290 8291 8292 8293 8294 8295 8296 8297 8298 8299 8300 8301 8302 8303 8304 8305 8306 8307 8308 8309 8310 8311 8312 8313 8314 8315 8316 8317 8318 8319 8320 8321 8322 8323 8324 8325 8326 8327 8328 8329 8330 8331 8332 8333 8334 8335 8336 8337 8338 8339 8340 8341 8342 8343 8344 8345 8346 8347 8348 8349 8350 8351 8352 8353 8354 8355 8356 8357 8358 8359 8360 8361 8362 8363 8364 8365 8366 8367 8368 8369 8370 8371 8372 8373 8374 8375 8376 8377 8378 8379 8380 8381 8382 8383 8384 8385 8386 8387 8388 8389 8390 8391 8392 8393 8394 8395 8396 8397 8398 8399 8400 8401 8402 8403 8404 8405 8406 8407 8408 8409 8410 8411 8412 8413 8414 8415 8416 8417 8418 8419 8420 8421 8422 8423 8424 8425 8426 8427 8428 8429 8430 8431 8432 8433 8434 8435 8436 8437 8438 8439 8440 8441 8442 8443 8444 8445 8446 8447 8448 8449 8450 8451 8452 8453 8454 8455 8456 8457 8458 8459 8460 8461
		{
			char buf[256];
			my_snprintf(buf, sizeof(buf),
				    "Transaction level '%s' in"
				    " InnoDB is not safe for binlog mode '%s'",
				    tx_isolation_names[tx_isolation],
				    binlog_format_names[binlog_format]);
			my_error(ER_BINLOG_LOGGING_IMPOSSIBLE, MYF(0), buf);
			DBUG_RETURN(HA_ERR_LOGGING_IMPOSSIBLE);
		}
	}


	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
	prebuilt->hint_need_to_fetch_extra_cols = 0;

	reset_template(prebuilt);

	if (lock_type == F_WRLCK) {

		/* If this is a SELECT, then it is in UPDATE TABLE ...
		or SELECT ... FOR UPDATE */
		prebuilt->select_lock_type = LOCK_X;
		prebuilt->stored_select_lock_type = LOCK_X;
	}

	if (lock_type != F_UNLCK) {
		/* MySQL is setting a new table lock */

		trx->detailed_error[0] = '\0';

		/* Set the MySQL flag to mark that there is an active
		transaction */
		if (trx->active_trans == 0) {

			innobase_register_trx_and_stmt(ht, thd);
			trx->active_trans = 1;
		} else if (trx->n_mysql_tables_in_use == 0) {
			innobase_register_stmt(ht, thd);
		}

		if (trx->isolation_level == TRX_ISO_SERIALIZABLE
			&& prebuilt->select_lock_type == LOCK_NONE
			&& thd_test_options(thd,
				OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

			/* To get serializable execution, we let InnoDB
			conceptually add 'LOCK IN SHARE MODE' to all SELECTs
			which otherwise would have been consistent reads. An
			exception is consistent reads in the AUTOCOMMIT=1 mode:
			we know that they are read-only transactions, and they
			can be serialized also if performed as consistent
			reads. */

			prebuilt->select_lock_type = LOCK_S;
			prebuilt->stored_select_lock_type = LOCK_S;
		}

		/* Starting from 4.1.9, no InnoDB table lock is taken in LOCK
		TABLES if AUTOCOMMIT=1. It does not make much sense to acquire
		an InnoDB table lock if it is released immediately at the end
		of LOCK TABLES, and InnoDB's table locks in that case cause
		VERY easily deadlocks.

		We do not set InnoDB table locks if user has not explicitly
		requested a table lock. Note that thd_in_lock_tables(thd)
		can hold in some cases, e.g., at the start of a stored
		procedure call (SQLCOM_CALL). */

		if (prebuilt->select_lock_type != LOCK_NONE) {

			if (thd_sql_command(thd) == SQLCOM_LOCK_TABLES
			    && THDVAR(thd, table_locks)
			    && thd_test_options(thd, OPTION_NOT_AUTOCOMMIT)
			    && thd_in_lock_tables(thd)) {

				ulint	error = row_lock_table_for_mysql(
					prebuilt, NULL, 0);

				if (error != DB_SUCCESS) {
					error = convert_error_code_to_mysql(
						(int) error, 0, thd);
					DBUG_RETURN((int) error);
				}
			}

			trx->mysql_n_tables_locked++;
		}

		trx->n_mysql_tables_in_use++;
		prebuilt->mysql_has_locked = TRUE;

		DBUG_RETURN(0);
	}

	/* MySQL is releasing a table lock */

	trx->n_mysql_tables_in_use--;
	prebuilt->mysql_has_locked = FALSE;

	/* Release a possible FIFO ticket and search latch. Since we
	may reserve the kernel mutex, we have to release the search
	system latch first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* If the MySQL lock count drops to zero we know that the current SQL
	statement has ended */

	if (trx->n_mysql_tables_in_use == 0) {

		trx->mysql_n_tables_locked = 0;
		prebuilt->used_in_HANDLER = FALSE;

		if (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {
			if (trx->active_trans != 0) {
				innobase_commit(ht, thd, TRUE);
			}
		} else {
			if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
						&& trx->global_read_view) {

				/* At low transaction isolation levels we let
				each consistent read set its own snapshot */

				read_view_close_for_mysql(trx);
			}
		}
	}

	DBUG_RETURN(0);
}

/******************************************************************//**
With this function MySQL request a transactional lock to a table when
user issued query LOCK TABLES..WHERE ENGINE = InnoDB.
@return	error code */
UNIV_INTERN
int
ha_innobase::transactional_table_lock(
/*==================================*/
	THD*	thd,		/*!< in: handle to the user thread */
	int	lock_type)	/*!< in: lock type */
{
	trx_t*		trx;

	DBUG_ENTER("ha_innobase::transactional_table_lock");
	DBUG_PRINT("enter",("lock_type: %d", lock_type));

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(thd);

	if (prebuilt->table->ibd_file_missing && !thd_tablespace_op(thd)) {
		ut_print_timestamp(stderr);
		fprintf(stderr,
			"  InnoDB: MySQL is trying to use a table handle"
			" but the .ibd file for\n"
			"InnoDB: table %s does not exist.\n"
			"InnoDB: Have you deleted the .ibd file"
			" from the database directory under\n"
			"InnoDB: the MySQL datadir?"
			"InnoDB: See " REFMAN
			"innodb-troubleshooting.html\n"
			"InnoDB: how you can resolve the problem.\n",
			prebuilt->table->name);
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
	prebuilt->hint_need_to_fetch_extra_cols = 0;

	reset_template(prebuilt);

	if (lock_type == F_WRLCK) {
		prebuilt->select_lock_type = LOCK_X;
		prebuilt->stored_select_lock_type = LOCK_X;
	} else if (lock_type == F_RDLCK) {
		prebuilt->select_lock_type = LOCK_S;
		prebuilt->stored_select_lock_type = LOCK_S;
	} else {
		ut_print_timestamp(stderr);
		fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to set transactional table lock with corrupted lock type\n"
"to table %s, lock type %d does not exist.\n",
				prebuilt->table->name, lock_type);
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	/* MySQL is setting a new transactional table lock */

	/* Set the MySQL flag to mark that there is an active transaction */
	if (trx->active_trans == 0) {

		innobase_register_trx_and_stmt(ht, thd);
		trx->active_trans = 1;
	}

	if (THDVAR(thd, table_locks) && thd_in_lock_tables(thd)) {
		ulint	error = DB_SUCCESS;

		error = row_lock_table_for_mysql(prebuilt, NULL, 0);

		if (error != DB_SUCCESS) {
			error = convert_error_code_to_mysql(
				(int) error, prebuilt->table->flags, thd);
			DBUG_RETURN((int) error);
		}

		if (thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

			/* Store the current undo_no of the transaction
			so that we know where to roll back if we have
			to roll back the next SQL statement */

			trx_mark_sql_stat_end(trx);
		}
	}

	DBUG_RETURN(0);
}

/************************************************************************//**
Here we export InnoDB status variables to MySQL. */
static
void
innodb_export_status(void)
/*======================*/
{
	if (innodb_inited) {
		srv_export_innodb_status();
	}
}

/************************************************************************//**
Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
Monitor to the client. */
static
bool
innodb_show_status(
/*===============*/
	handlerton*	hton,	/*!< in: the innodb handlerton */
	THD*	thd,	/*!< in: the MySQL query thread of the caller */
	stat_print_fn *stat_print)
{
	trx_t*			trx;
	static const char	truncated_msg[] = "... truncated...\n";
	const long		MAX_STATUS_SIZE = 64000;
	ulint			trx_list_start = ULINT_UNDEFINED;
	ulint			trx_list_end = ULINT_UNDEFINED;

	DBUG_ENTER("innodb_show_status");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx = check_trx_exists(thd);

	innobase_release_stat_resources(trx);

	/* We let the InnoDB Monitor to output at most MAX_STATUS_SIZE
	bytes of text. */

	long	flen, usable_len;
	char*	str;

	mutex_enter(&srv_monitor_file_mutex);
	rewind(srv_monitor_file);
8462 8463
	srv_printf_innodb_monitor(srv_monitor_file, FALSE,
				  &trx_list_start, &trx_list_end);
8464 8465 8466 8467 8468 8469 8470 8471 8472 8473 8474 8475 8476 8477 8478 8479 8480 8481 8482 8483 8484 8485 8486 8487 8488 8489 8490 8491 8492 8493 8494 8495 8496 8497 8498 8499 8500 8501 8502 8503 8504 8505 8506 8507 8508 8509 8510 8511 8512 8513 8514 8515 8516 8517 8518 8519 8520 8521 8522 8523 8524 8525 8526 8527 8528 8529 8530 8531 8532 8533 8534 8535 8536 8537 8538 8539 8540 8541 8542 8543 8544 8545 8546 8547 8548 8549 8550 8551 8552 8553 8554 8555 8556 8557 8558 8559 8560 8561 8562 8563 8564 8565 8566 8567 8568 8569 8570 8571 8572 8573 8574 8575 8576 8577 8578 8579 8580 8581 8582 8583 8584 8585 8586 8587 8588 8589 8590 8591 8592 8593 8594 8595 8596 8597 8598 8599 8600 8601 8602 8603 8604 8605 8606 8607 8608 8609 8610 8611 8612 8613 8614 8615 8616 8617 8618 8619 8620 8621 8622 8623 8624 8625 8626 8627 8628 8629 8630 8631 8632 8633 8634 8635 8636 8637 8638 8639 8640 8641 8642 8643 8644 8645 8646 8647 8648 8649 8650 8651 8652 8653 8654 8655 8656 8657 8658 8659 8660 8661 8662 8663 8664 8665 8666 8667 8668 8669 8670 8671 8672 8673 8674 8675 8676 8677 8678 8679 8680 8681 8682 8683 8684 8685 8686 8687 8688 8689 8690 8691 8692 8693 8694 8695 8696 8697 8698 8699 8700
	flen = ftell(srv_monitor_file);
	os_file_set_eof(srv_monitor_file);

	if (flen < 0) {
		flen = 0;
	}

	if (flen > MAX_STATUS_SIZE) {
		usable_len = MAX_STATUS_SIZE;
	} else {
		usable_len = flen;
	}

	/* allocate buffer for the string, and
	read the contents of the temporary file */

	if (!(str = (char*) my_malloc(usable_len + 1, MYF(0)))) {
	  mutex_exit(&srv_monitor_file_mutex);
	  DBUG_RETURN(TRUE);
	}

	rewind(srv_monitor_file);
	if (flen < MAX_STATUS_SIZE) {
		/* Display the entire output. */
		flen = (long) fread(str, 1, flen, srv_monitor_file);
	} else if (trx_list_end < (ulint) flen
			&& trx_list_start < trx_list_end
			&& trx_list_start + (flen - trx_list_end)
			< MAX_STATUS_SIZE - sizeof truncated_msg - 1) {
		/* Omit the beginning of the list of active transactions. */
		long len = (long) fread(str, 1, trx_list_start, srv_monitor_file);
		memcpy(str + len, truncated_msg, sizeof truncated_msg - 1);
		len += sizeof truncated_msg - 1;
		usable_len = (MAX_STATUS_SIZE - 1) - len;
		fseek(srv_monitor_file, flen - usable_len, SEEK_SET);
		len += (long) fread(str + len, 1, usable_len, srv_monitor_file);
		flen = len;
	} else {
		/* Omit the end of the output. */
		flen = (long) fread(str, 1, MAX_STATUS_SIZE - 1, srv_monitor_file);
	}

	mutex_exit(&srv_monitor_file_mutex);

	bool result = FALSE;

	if (stat_print(thd, innobase_hton_name, (uint) strlen(innobase_hton_name),
			STRING_WITH_LEN(""), str, flen)) {
		result= TRUE;
	}
	my_free(str, MYF(0));

	DBUG_RETURN(FALSE);
}

/************************************************************************//**
Implements the SHOW MUTEX STATUS command. . */
static
bool
innodb_mutex_show_status(
/*=====================*/
	handlerton*	hton,	/*!< in: the innodb handlerton */
	THD*		thd,		/*!< in: the MySQL query thread of the
					caller */
	stat_print_fn*	stat_print)
{
	char buf1[IO_SIZE], buf2[IO_SIZE];
	mutex_t*	mutex;
	rw_lock_t*	lock;
#ifdef UNIV_DEBUG
	ulint	  rw_lock_count= 0;
	ulint	  rw_lock_count_spin_loop= 0;
	ulint	  rw_lock_count_spin_rounds= 0;
	ulint	  rw_lock_count_os_wait= 0;
	ulint	  rw_lock_count_os_yield= 0;
	ulonglong rw_lock_wait_time= 0;
#endif /* UNIV_DEBUG */
	uint	  hton_name_len= (uint) strlen(innobase_hton_name), buf1len, buf2len;
	DBUG_ENTER("innodb_mutex_show_status");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	mutex_enter(&mutex_list_mutex);

	mutex = UT_LIST_GET_FIRST(mutex_list);

	while (mutex != NULL) {
		if (mutex->count_os_wait == 0
		    || buf_pool_is_block_mutex(mutex)) {
			goto next_mutex;
		}
#ifdef UNIV_DEBUG
		if (mutex->mutex_type != 1) {
			if (mutex->count_using > 0) {
				buf1len= my_snprintf(buf1, sizeof(buf1),
					"%s:%s",
					mutex->cmutex_name, mutex->cfile_name);
				buf2len= my_snprintf(buf2, sizeof(buf2),
					"count=%lu, spin_waits=%lu,"
					" spin_rounds=%lu, "
					"os_waits=%lu, os_yields=%lu,"
					" os_wait_times=%lu",
					mutex->count_using,
					mutex->count_spin_loop,
					mutex->count_spin_rounds,
					mutex->count_os_wait,
					mutex->count_os_yield,
					(ulong) (mutex->lspent_time/1000));

				if (stat_print(thd, innobase_hton_name,
						hton_name_len, buf1, buf1len,
						buf2, buf2len)) {
					mutex_exit(&mutex_list_mutex);
					DBUG_RETURN(1);
				}
			}
		}
		else {
			rw_lock_count += mutex->count_using;
			rw_lock_count_spin_loop += mutex->count_spin_loop;
			rw_lock_count_spin_rounds += mutex->count_spin_rounds;
			rw_lock_count_os_wait += mutex->count_os_wait;
			rw_lock_count_os_yield += mutex->count_os_yield;
			rw_lock_wait_time += mutex->lspent_time;
		}
#else /* UNIV_DEBUG */
		buf1len= (uint) my_snprintf(buf1, sizeof(buf1), "%s:%lu",
				     mutex->cfile_name, (ulong) mutex->cline);
		buf2len= (uint) my_snprintf(buf2, sizeof(buf2), "os_waits=%lu",
				     mutex->count_os_wait);

		if (stat_print(thd, innobase_hton_name,
			       hton_name_len, buf1, buf1len,
			       buf2, buf2len)) {
			mutex_exit(&mutex_list_mutex);
			DBUG_RETURN(1);
		}
#endif /* UNIV_DEBUG */

next_mutex:
		mutex = UT_LIST_GET_NEXT(list, mutex);
	}

	mutex_exit(&mutex_list_mutex);

	mutex_enter(&rw_lock_list_mutex);

	lock = UT_LIST_GET_FIRST(rw_lock_list);

	while (lock != NULL) {
		if (lock->count_os_wait
		    && !buf_pool_is_block_lock(lock)) {
			buf1len= my_snprintf(buf1, sizeof(buf1), "%s:%lu",
                                    lock->cfile_name, (ulong) lock->cline);
			buf2len= my_snprintf(buf2, sizeof(buf2),
                                    "os_waits=%lu", lock->count_os_wait);

			if (stat_print(thd, innobase_hton_name,
				       hton_name_len, buf1, buf1len,
				       buf2, buf2len)) {
				mutex_exit(&rw_lock_list_mutex);
				DBUG_RETURN(1);
			}
		}
		lock = UT_LIST_GET_NEXT(list, lock);
	}

	mutex_exit(&rw_lock_list_mutex);

#ifdef UNIV_DEBUG
	buf2len= my_snprintf(buf2, sizeof(buf2),
		"count=%lu, spin_waits=%lu, spin_rounds=%lu, "
		"os_waits=%lu, os_yields=%lu, os_wait_times=%lu",
		rw_lock_count, rw_lock_count_spin_loop,
		rw_lock_count_spin_rounds,
		rw_lock_count_os_wait, rw_lock_count_os_yield,
		(ulong) (rw_lock_wait_time/1000));

	if (stat_print(thd, innobase_hton_name, hton_name_len,
			STRING_WITH_LEN("rw_lock_mutexes"), buf2, buf2len)) {
		DBUG_RETURN(1);
	}
#endif /* UNIV_DEBUG */

	DBUG_RETURN(FALSE);
}

static
bool innobase_show_status(handlerton *hton, THD* thd, 
                          stat_print_fn* stat_print,
                          enum ha_stat_type stat_type)
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	switch (stat_type) {
	case HA_ENGINE_STATUS:
		return innodb_show_status(hton, thd, stat_print);
	case HA_ENGINE_MUTEX:
		return innodb_mutex_show_status(hton, thd, stat_print);
	default:
		return(FALSE);
	}
}

/************************************************************************//**
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

static INNOBASE_SHARE* get_share(const char* table_name)
{
	INNOBASE_SHARE *share;
	pthread_mutex_lock(&innobase_share_mutex);

	ulint	fold = ut_fold_string(table_name);

	HASH_SEARCH(table_name_hash, innobase_open_tables, fold,
		    INNOBASE_SHARE*, share,
		    ut_ad(share->use_count > 0),
		    !strcmp(share->table_name, table_name));

	if (!share) {

		uint length = (uint) strlen(table_name);

		/* TODO: invoke HASH_MIGRATE if innobase_open_tables
		grows too big */

		share = (INNOBASE_SHARE *) my_malloc(sizeof(*share)+length+1,
			MYF(MY_FAE | MY_ZEROFILL));

		share->table_name = (char*) memcpy(share + 1,
						   table_name, length + 1);

		HASH_INSERT(INNOBASE_SHARE, table_name_hash,
			    innobase_open_tables, fold, share);

		thr_lock_init(&share->lock);
8701 8702 8703 8704 8705

		/* Index translation table initialization */
		share->idx_trans_tbl.index_mapping = NULL;
		share->idx_trans_tbl.index_count = 0;
		share->idx_trans_tbl.array_size = 0;
8706 8707 8708 8709 8710 8711 8712 8713 8714 8715 8716 8717 8718 8719 8720 8721 8722 8723 8724 8725 8726 8727 8728 8729 8730 8731 8732 8733 8734 8735
	}

	share->use_count++;
	pthread_mutex_unlock(&innobase_share_mutex);

	return(share);
}

static void free_share(INNOBASE_SHARE* share)
{
	pthread_mutex_lock(&innobase_share_mutex);

#ifdef UNIV_DEBUG
	INNOBASE_SHARE* share2;
	ulint	fold = ut_fold_string(share->table_name);

	HASH_SEARCH(table_name_hash, innobase_open_tables, fold,
		    INNOBASE_SHARE*, share2,
		    ut_ad(share->use_count > 0),
		    !strcmp(share->table_name, share2->table_name));

	ut_a(share2 == share);
#endif /* UNIV_DEBUG */

	if (!--share->use_count) {
		ulint	fold = ut_fold_string(share->table_name);

		HASH_DELETE(INNOBASE_SHARE, table_name_hash,
			    innobase_open_tables, fold, share);
		thr_lock_delete(&share->lock);
8736 8737 8738 8739 8740

		/* Free any memory from index translation table */
		my_free(share->idx_trans_tbl.index_mapping,
			MYF(MY_ALLOW_ZERO_PTR));

8741 8742 8743 8744 8745 8746 8747 8748 8749 8750 8751 8752 8753 8754 8755 8756 8757 8758 8759 8760 8761 8762 8763 8764 8765 8766 8767 8768 8769 8770 8771 8772 8773 8774 8775 8776 8777 8778 8779 8780 8781 8782 8783 8784 8785 8786 8787 8788 8789 8790 8791 8792 8793 8794 8795 8796 8797 8798 8799 8800 8801 8802 8803 8804 8805 8806 8807 8808 8809 8810 8811 8812 8813 8814 8815 8816 8817 8818 8819 8820 8821 8822 8823 8824 8825 8826 8827 8828 8829 8830 8831 8832 8833 8834 8835 8836 8837 8838 8839 8840 8841 8842 8843 8844 8845 8846
		my_free(share, MYF(0));

		/* TODO: invoke HASH_MIGRATE if innobase_open_tables
		shrinks too much */
	}

	pthread_mutex_unlock(&innobase_share_mutex);
}

/*****************************************************************//**
Converts a MySQL table lock stored in the 'lock' field of the handle to
a proper type before storing pointer to the lock into an array of pointers.
MySQL also calls this if it wants to reset some table locks to a not-locked
state during the processing of an SQL query. An example is that during a
SELECT the read lock is released early on the 'const' tables where we only
fetch one row. MySQL does not call this when it releases all locks at the
end of an SQL statement.
@return	pointer to the next element in the 'to' array */
UNIV_INTERN
THR_LOCK_DATA**
ha_innobase::store_lock(
/*====================*/
	THD*			thd,		/*!< in: user thread handle */
	THR_LOCK_DATA**		to,		/*!< in: pointer to an array
						of pointers to lock structs;
						pointer to the 'lock' field
						of current handle is stored
						next to this array */
	enum thr_lock_type	lock_type)	/*!< in: lock type to store in
						'lock'; this may also be
						TL_IGNORE */
{
	trx_t*		trx;

	/* Note that trx in this function is NOT necessarily prebuilt->trx
	because we call update_thd() later, in ::external_lock()! Failure to
	understand this caused a serious memory corruption bug in 5.1.11. */

	trx = check_trx_exists(thd);

	/* NOTE: MySQL can call this function with lock 'type' TL_IGNORE!
	Be careful to ignore TL_IGNORE if we are going to do something with
	only 'real' locks! */

	/* If no MySQL table is in use, we need to set the isolation level
	of the transaction. */

	if (lock_type != TL_IGNORE
	    && trx->n_mysql_tables_in_use == 0) {
		trx->isolation_level = innobase_map_isolation_level(
			(enum_tx_isolation) thd_tx_isolation(thd));

		if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
		    && trx->global_read_view) {

			/* At low transaction isolation levels we let
			each consistent read set its own snapshot */

			read_view_close_for_mysql(trx);
		}
	}

	DBUG_ASSERT(EQ_CURRENT_THD(thd));
	const bool in_lock_tables = thd_in_lock_tables(thd);
	const uint sql_command = thd_sql_command(thd);

	if (sql_command == SQLCOM_DROP_TABLE) {

		/* MySQL calls this function in DROP TABLE though this table
		handle may belong to another thd that is running a query. Let
		us in that case skip any changes to the prebuilt struct. */ 

	} else if ((lock_type == TL_READ && in_lock_tables)
		   || (lock_type == TL_READ_HIGH_PRIORITY && in_lock_tables)
		   || lock_type == TL_READ_WITH_SHARED_LOCKS
		   || lock_type == TL_READ_NO_INSERT
		   || (lock_type != TL_IGNORE
		       && sql_command != SQLCOM_SELECT)) {

		/* The OR cases above are in this order:
		1) MySQL is doing LOCK TABLES ... READ LOCAL, or we
		are processing a stored procedure or function, or
		2) (we do not know when TL_READ_HIGH_PRIORITY is used), or
		3) this is a SELECT ... IN SHARE MODE, or
		4) we are doing a complex SQL statement like
		INSERT INTO ... SELECT ... and the logical logging (MySQL
		binlog) requires the use of a locking read, or
		MySQL is doing LOCK TABLES ... READ.
		5) we let InnoDB do locking reads for all SQL statements that
		are not simple SELECTs; note that select_lock_type in this
		case may get strengthened in ::external_lock() to LOCK_X.
		Note that we MUST use a locking read in all data modifying
		SQL statements, because otherwise the execution would not be
		serializable, and also the results from the update could be
		unexpected if an obsolete consistent read view would be
		used. */

		ulint	isolation_level;

		isolation_level = trx->isolation_level;

		if ((srv_locks_unsafe_for_binlog
		     || isolation_level == TRX_ISO_READ_COMMITTED)
		    && isolation_level != TRX_ISO_SERIALIZABLE
		    && (lock_type == TL_READ || lock_type == TL_READ_NO_INSERT)
		    && (sql_command == SQLCOM_INSERT_SELECT
8847
			|| sql_command == SQLCOM_REPLACE_SELECT
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			|| sql_command == SQLCOM_UPDATE
			|| sql_command == SQLCOM_CREATE_TABLE)) {

			/* If we either have innobase_locks_unsafe_for_binlog
			option set or this session is using READ COMMITTED
			isolation level and isolation level of the transaction
			is not set to serializable and MySQL is doing
8855 8856 8857 8858 8859
			INSERT INTO...SELECT or REPLACE INTO...SELECT
			or UPDATE ... = (SELECT ...) or CREATE  ...
			SELECT... without FOR UPDATE or IN SHARE
			MODE in select, then we use consistent read
			for select. */
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			prebuilt->select_lock_type = LOCK_NONE;
			prebuilt->stored_select_lock_type = LOCK_NONE;
		} else if (sql_command == SQLCOM_CHECKSUM) {
			/* Use consistent read for checksum table */

			prebuilt->select_lock_type = LOCK_NONE;
			prebuilt->stored_select_lock_type = LOCK_NONE;
		} else {
			prebuilt->select_lock_type = LOCK_S;
			prebuilt->stored_select_lock_type = LOCK_S;
		}

	} else if (lock_type != TL_IGNORE) {

		/* We set possible LOCK_X value in external_lock, not yet
		here even if this would be SELECT ... FOR UPDATE */

		prebuilt->select_lock_type = LOCK_NONE;
		prebuilt->stored_select_lock_type = LOCK_NONE;
	}

	if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK) {

		/* Starting from 5.0.7, we weaken also the table locks
		set at the start of a MySQL stored procedure call, just like
		we weaken the locks set at the start of an SQL statement.
		MySQL does set in_lock_tables TRUE there, but in reality
		we do not need table locks to make the execution of a
		single transaction stored procedure call deterministic
		(if it does not use a consistent read). */

		if (lock_type == TL_READ
		    && sql_command == SQLCOM_LOCK_TABLES) {
			/* We come here if MySQL is processing LOCK TABLES
			... READ LOCAL. MyISAM under that table lock type
			reads the table as it was at the time the lock was
			granted (new inserts are allowed, but not seen by the
			reader). To get a similar effect on an InnoDB table,
			we must use LOCK TABLES ... READ. We convert the lock
			type here, so that for InnoDB, READ LOCAL is
			equivalent to READ. This will change the InnoDB
			behavior in mysqldump, so that dumps of InnoDB tables
			are consistent with dumps of MyISAM tables. */

			lock_type = TL_READ_NO_INSERT;
		}

		/* If we are not doing a LOCK TABLE, DISCARD/IMPORT
		TABLESPACE or TRUNCATE TABLE then allow multiple
		writers. Note that ALTER TABLE uses a TL_WRITE_ALLOW_READ
		< TL_WRITE_CONCURRENT_INSERT.

		We especially allow multiple writers if MySQL is at the
		start of a stored procedure call (SQLCOM_CALL) or a
		stored function call (MySQL does have in_lock_tables
		TRUE there). */

		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT
		     && lock_type <= TL_WRITE)
		    && !(in_lock_tables
			 && sql_command == SQLCOM_LOCK_TABLES)
		    && !thd_tablespace_op(thd)
		    && sql_command != SQLCOM_TRUNCATE
		    && sql_command != SQLCOM_OPTIMIZE
		    && sql_command != SQLCOM_CREATE_TABLE) {

			lock_type = TL_WRITE_ALLOW_WRITE;
		}

		/* In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
		MySQL would use the lock TL_READ_NO_INSERT on t2, and that
		would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
		to t2. Convert the lock to a normal read lock to allow
		concurrent inserts to t2.

		We especially allow concurrent inserts if MySQL is at the
		start of a stored procedure call (SQLCOM_CALL)
		(MySQL does have thd_in_lock_tables() TRUE there). */

		if (lock_type == TL_READ_NO_INSERT
		    && sql_command != SQLCOM_LOCK_TABLES) {

			lock_type = TL_READ;
		}

		lock.type = lock_type;
	}

	*to++= &lock;

	return(to);
}

/*********************************************************************//**
Read the next autoinc value. Acquire the relevant locks before reading
the AUTOINC value. If SUCCESS then the table AUTOINC mutex will be locked
on return and all relevant locks acquired.
@return	DB_SUCCESS or error code */
UNIV_INTERN
ulint
ha_innobase::innobase_get_autoinc(
/*==============================*/
	ulonglong*	value)		/*!< out: autoinc value */
{
 	*value = 0;
 
	prebuilt->autoinc_error = innobase_lock_autoinc();

	if (prebuilt->autoinc_error == DB_SUCCESS) {

		/* Determine the first value of the interval */
		*value = dict_table_autoinc_read(prebuilt->table);

		/* It should have been initialized during open. */
		ut_a(*value != 0);
	}

	return(prebuilt->autoinc_error);
}

/*******************************************************************//**
This function reads the global auto-inc counter. It doesn't use the 
AUTOINC lock even if the lock mode is set to TRADITIONAL.
@return	the autoinc value */
UNIV_INTERN
ulonglong
ha_innobase::innobase_peek_autoinc(void)
/*====================================*/
{
	ulonglong	auto_inc;
	dict_table_t*	innodb_table;

	ut_a(prebuilt != NULL);
	ut_a(prebuilt->table != NULL);

	innodb_table = prebuilt->table;

	dict_table_autoinc_lock(innodb_table);

	auto_inc = dict_table_autoinc_read(innodb_table);

	ut_a(auto_inc > 0);

	dict_table_autoinc_unlock(innodb_table);

	return(auto_inc);
}

/*********************************************************************//**
This function initializes the auto-inc counter if it has not been
initialized yet. This function does not change the value of the auto-inc
counter if it already has been initialized. Returns the value of the
auto-inc counter in *first_value, and ULONGLONG_MAX in *nb_reserved_values (as
we have a table-level lock). offset, increment, nb_desired_values are ignored.
*first_value is set to -1 if error (deadlock or lock wait timeout) */
UNIV_INTERN
void
ha_innobase::get_auto_increment(
/*============================*/
        ulonglong	offset,              /*!< in: table autoinc offset */
        ulonglong	increment,           /*!< in: table autoinc increment */
        ulonglong	nb_desired_values,   /*!< in: number of values reqd */
        ulonglong	*first_value,        /*!< out: the autoinc value */
        ulonglong	*nb_reserved_values) /*!< out: count of reserved values */
{
	trx_t*		trx;
	ulint		error;
	ulonglong	autoinc = 0;

	/* Prepare prebuilt->trx in the table handle */
	update_thd(ha_thd());

	error = innobase_get_autoinc(&autoinc);

	if (error != DB_SUCCESS) {
		*first_value = (~(ulonglong) 0);
		return;
	}

	/* This is a hack, since nb_desired_values seems to be accurate only
	for the first call to get_auto_increment() for multi-row INSERT and
	meaningless for other statements e.g, LOAD etc. Subsequent calls to
	this method for the same statement results in different values which
	don't make sense. Therefore we store the value the first time we are
	called and count down from that as rows are written (see write_row()).
	*/

	trx = prebuilt->trx;

	/* Note: We can't rely on *first_value since some MySQL engines,
	in particular the partition engine, don't initialize it to 0 when
	invoking this method. So we are not sure if it's guaranteed to
	be 0 or not. */

	/* Called for the first time ? */
	if (trx->n_autoinc_rows == 0) {

		trx->n_autoinc_rows = (ulint) nb_desired_values;

		/* It's possible for nb_desired_values to be 0:
		e.g., INSERT INTO T1(C) SELECT C FROM T2; */
		if (nb_desired_values == 0) {

			trx->n_autoinc_rows = 1;
		}

		set_if_bigger(*first_value, autoinc);
	/* Not in the middle of a mult-row INSERT. */
	} else if (prebuilt->autoinc_last_value == 0) {
		set_if_bigger(*first_value, autoinc);
	}

	*nb_reserved_values = trx->n_autoinc_rows;

	/* With old style AUTOINC locking we only update the table's
	AUTOINC counter after attempting to insert the row. */
	if (innobase_autoinc_lock_mode != AUTOINC_OLD_STYLE_LOCKING) {
		ulonglong	need;
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		ulonglong	next_value;
		ulonglong	col_max_value;

		/* We need the upper limit of the col type to check for
		whether we update the table autoinc counter or not. */
		col_max_value = innobase_get_int_col_max_value(
			table->next_number_field);

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		need = *nb_reserved_values * increment;

		/* Compute the last value in the interval */
		next_value = innobase_next_autoinc(
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		prebuilt->autoinc_last_value = next_value;

		if (prebuilt->autoinc_last_value < *first_value) {
			*first_value = (~(ulonglong) 0);
		} else {
			/* Update the table autoinc variable */
			dict_table_autoinc_update_if_greater(
				prebuilt->table, prebuilt->autoinc_last_value);
		}
	} else {
		/* This will force write_row() into attempting an update
		of the table's AUTOINC counter. */
		prebuilt->autoinc_last_value = 0;
	}

	/* The increment to be used to increase the AUTOINC value, we use
	this in write_row() and update_row() to increase the autoinc counter
	for columns that are filled by the user. We need the offset and
	the increment. */
	prebuilt->autoinc_offset = offset;
	prebuilt->autoinc_increment = increment;

	dict_table_autoinc_unlock(prebuilt->table);
}

/*******************************************************************//**
Reset the auto-increment counter to the given value, i.e. the next row
inserted will get the given value. This is called e.g. after TRUNCATE
is emulated by doing a 'DELETE FROM t'. HA_ERR_WRONG_COMMAND is
returned by storage engines that don't support this operation.
@return	0 or error code */
UNIV_INTERN
int
ha_innobase::reset_auto_increment(
/*==============================*/
	ulonglong	value)		/*!< in: new value for table autoinc */
{
	DBUG_ENTER("ha_innobase::reset_auto_increment");

	int	error;

	update_thd(ha_thd());

	error = row_lock_table_autoinc_for_mysql(prebuilt);

	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error,
						    prebuilt->table->flags,
						    user_thd);

		DBUG_RETURN(error);
	}

	/* The next value can never be 0. */
	if (value == 0) {
		value = 1;
	}

	innobase_reset_autoinc(value);

	DBUG_RETURN(0);
}

/* See comment in handler.cc */
UNIV_INTERN
bool
ha_innobase::get_error_message(int error, String *buf)
{
	trx_t*	trx = check_trx_exists(ha_thd());

	buf->copy(trx->detailed_error, (uint) strlen(trx->detailed_error),
		system_charset_info);

	return(FALSE);
}

/*******************************************************************//**
Compares two 'refs'. A 'ref' is the (internal) primary key value of the row.
If there is no explicitly declared non-null unique key or a primary key, then
InnoDB internally uses the row id as the primary key.
@return	< 0 if ref1 < ref2, 0 if equal, else > 0 */
UNIV_INTERN
int
ha_innobase::cmp_ref(
/*=================*/
	const uchar*	ref1,	/*!< in: an (internal) primary key value in the
				MySQL key value format */
	const uchar*	ref2)	/*!< in: an (internal) primary key value in the
				MySQL key value format */
{
	enum_field_types mysql_type;
	Field*		field;
	KEY_PART_INFO*	key_part;
	KEY_PART_INFO*	key_part_end;
	uint		len1;
	uint		len2;
	int		result;

	if (prebuilt->clust_index_was_generated) {
		/* The 'ref' is an InnoDB row id */

		return(memcmp(ref1, ref2, DATA_ROW_ID_LEN));
	}

	/* Do a type-aware comparison of primary key fields. PK fields
	are always NOT NULL, so no checks for NULL are performed. */

	key_part = table->key_info[table->s->primary_key].key_part;

	key_part_end = key_part
			+ table->key_info[table->s->primary_key].key_parts;

	for (; key_part != key_part_end; ++key_part) {
		field = key_part->field;
		mysql_type = field->type();

		if (mysql_type == MYSQL_TYPE_TINY_BLOB
			|| mysql_type == MYSQL_TYPE_MEDIUM_BLOB
			|| mysql_type == MYSQL_TYPE_BLOB
			|| mysql_type == MYSQL_TYPE_LONG_BLOB) {

			/* In the MySQL key value format, a column prefix of
			a BLOB is preceded by a 2-byte length field */

			len1 = innobase_read_from_2_little_endian(ref1);
			len2 = innobase_read_from_2_little_endian(ref2);

			ref1 += 2;
			ref2 += 2;
			result = ((Field_blob*)field)->cmp( ref1, len1,
                                                            ref2, len2);
		} else {
			result = field->key_cmp(ref1, ref2);
		}

		if (result) {

			return(result);
		}

		ref1 += key_part->store_length;
		ref2 += key_part->store_length;
	}

	return(0);
}

/*******************************************************************//**
Ask InnoDB if a query to a table can be cached.
@return	TRUE if query caching of the table is permitted */
UNIV_INTERN
my_bool
ha_innobase::register_query_cache_table(
/*====================================*/
	THD*		thd,		/*!< in: user thread handle */
	char*		table_key,	/*!< in: concatenation of database name,
					the null character NUL,
					and the table name */
	uint		key_length,	/*!< in: length of the full name, i.e.
					len(dbname) + len(tablename) + 1 */
	qc_engine_callback*
			call_back,	/*!< out: pointer to function for
					checking if query caching
					is permitted */
	ulonglong	*engine_data)	/*!< in/out: data to call_back */
{
	*call_back = innobase_query_caching_of_table_permitted;
	*engine_data = 0;
	return(innobase_query_caching_of_table_permitted(thd, table_key,
							 key_length,
							 engine_data));
}

UNIV_INTERN
char*
ha_innobase::get_mysql_bin_log_name()
{
	return(trx_sys_mysql_bin_log_name);
}

UNIV_INTERN
ulonglong
ha_innobase::get_mysql_bin_log_pos()
{
	/* trx... is ib_int64_t, which is a typedef for a 64-bit integer
	(__int64 or longlong) so it's ok to cast it to ulonglong. */

	return(trx_sys_mysql_bin_log_pos);
}

/******************************************************************//**
This function is used to find the storage length in bytes of the first n
characters for prefix indexes using a multibyte character set. The function
finds charset information and returns length of prefix_len characters in the
index field in bytes.
@return	number of bytes occupied by the first n characters */
extern "C" UNIV_INTERN
ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
	ulint charset_id,	/*!< in: character set id */
	ulint prefix_len,	/*!< in: prefix length in bytes of the index
				(this has to be divided by mbmaxlen to get the
				number of CHARACTERS n in the prefix) */
	ulint data_len,		/*!< in: length of the string in bytes */
	const char* str)	/*!< in: character string */
{
	ulint char_length;	/*!< character length in bytes */
	ulint n_chars;		/*!< number of characters in prefix */
	CHARSET_INFO* charset;	/*!< charset used in the field */

	charset = get_charset((uint) charset_id, MYF(MY_WME));

	ut_ad(charset);
	ut_ad(charset->mbmaxlen);

	/* Calculate how many characters at most the prefix index contains */

	n_chars = prefix_len / charset->mbmaxlen;

	/* If the charset is multi-byte, then we must find the length of the
	first at most n chars in the string. If the string contains less
	characters than n, then we return the length to the end of the last
	character. */

	if (charset->mbmaxlen > 1) {
		/* my_charpos() returns the byte length of the first n_chars
		characters, or a value bigger than the length of str, if
		there were not enough full characters in str.

		Why does the code below work:
		Suppose that we are looking for n UTF-8 characters.

		1) If the string is long enough, then the prefix contains at
		least n complete UTF-8 characters + maybe some extra
		characters + an incomplete UTF-8 character. No problem in
		this case. The function returns the pointer to the
		end of the nth character.

		2) If the string is not long enough, then the string contains
		the complete value of a column, that is, only complete UTF-8
		characters, and we can store in the column prefix index the
		whole string. */

		char_length = my_charpos(charset, str,
						str + data_len, (int) n_chars);
		if (char_length > data_len) {
			char_length = data_len;
		}
	} else {
		if (data_len < prefix_len) {
			char_length = data_len;
		} else {
			char_length = prefix_len;
		}
	}

	return(char_length);
}

/*******************************************************************//**
This function is used to prepare an X/Open XA distributed transaction.
@return	0 or error number */
static
int
innobase_xa_prepare(
/*================*/
        handlerton*	hton,	/*!< in: InnoDB handlerton */
	THD*		thd,	/*!< in: handle to the MySQL thread of
				the user whose XA transaction should
				be prepared */
	bool		all)	/*!< in: TRUE - commit transaction
				FALSE - the current SQL statement
				ended */
{
	int error = 0;
	trx_t* trx = check_trx_exists(thd);

	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* we use support_xa value as it was seen at transaction start
	time, not the current session variable value. Any possible changes
	to the session variable take effect only in the next transaction */
	if (!trx->support_xa) {

		return(0);
	}

	thd_get_xid(thd, (MYSQL_XID*) &trx->xid);

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

	if (trx->active_trans == 0 && trx->conc_state != TRX_NOT_STARTED) {

	  sql_print_error("trx->active_trans == 0, but trx->conc_state != "
			  "TRX_NOT_STARTED");
	}

	if (all
		|| (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		/* We were instructed to prepare the whole transaction, or
		this is an SQL statement end and autocommit is on */

		ut_ad(trx->active_trans);

		error = (int) trx_prepare_for_mysql(trx);
	} else {
		/* We just mark the SQL statement ended and do not do a
		transaction prepare */

		/* If we had reserved the auto-inc lock for some
		table in this SQL statement we release it now */

		row_unlock_table_autoinc_for_mysql(trx);

		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
	}

	/* Tell the InnoDB server that there might be work for utility
	threads: */

	srv_active_wake_master_thread();

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	if (thd_sql_command(thd) != SQLCOM_XA_PREPARE &&
	    (all || !thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
	{

		/* For ibbackup to work the order of transactions in binlog
		and InnoDB must be the same. Consider the situation

		  thread1> prepare; write to binlog; ...
			  <context switch>
		  thread2> prepare; write to binlog; commit
		  thread1>			     ... commit

		To ensure this will not happen we're taking the mutex on
		prepare, and releasing it on commit.

		Note: only do it for normal commits, done via ha_commit_trans.
		If 2pc protocol is executed by external transaction
		coordinator, it will be just a regular MySQL client
		executing XA PREPARE and XA COMMIT commands.
		In this case we cannot know how many minutes or hours
		will be between XA PREPARE and XA COMMIT, and we don't want
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		to block for undefined period of time. */
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		pthread_mutex_lock(&prepare_commit_mutex);
		trx->active_trans = 2;
	}

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	return(error);
}

/*******************************************************************//**
This function is used to recover X/Open XA distributed transactions.
@return	number of prepared transactions stored in xid_list */
static
int
innobase_xa_recover(
/*================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	XID*		xid_list,/*!< in/out: prepared transactions */
	uint		len)	/*!< in: number of slots in xid_list */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (len == 0 || xid_list == NULL) {

		return(0);
	}

	return(trx_recover_for_mysql(xid_list, len));
}

/*******************************************************************//**
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state
@return	0 or error number */
static
int
innobase_commit_by_xid(
/*===================*/
        handlerton *hton,
	XID*	xid)	/*!< in: X/Open XA transaction identification */
{
	trx_t*	trx;

	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		innobase_commit_low(trx);

		return(XA_OK);
	} else {
		return(XAER_NOTA);
	}
}

/*******************************************************************//**
This function is used to rollback one X/Open XA distributed transaction
which is in the prepared state
@return	0 or error number */
static
int
innobase_rollback_by_xid(
/*=====================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	XID*		xid)	/*!< in: X/Open XA transaction
				identification */
{
	trx_t*	trx;

	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		return(innobase_rollback_trx(trx));
	} else {
		return(XAER_NOTA);
	}
}

/*******************************************************************//**
Create a consistent view for a cursor based on current transaction
which is created if the corresponding MySQL thread still lacks one.
This consistent view is then used inside of MySQL when accessing records
using a cursor.
@return	pointer to cursor view or NULL */
static
void*
innobase_create_cursor_view(
/*========================*/
        handlerton *hton, /*!< in: innobase hton */
	THD* thd)	  /*!< in: user thread handle */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	return(read_cursor_view_create_for_mysql(check_trx_exists(thd)));
}

/*******************************************************************//**
Close the given consistent cursor view of a transaction and restore
global read view to a transaction read view. Transaction is created if the
corresponding MySQL thread still lacks one. */
static
void
innobase_close_cursor_view(
/*=======================*/
        handlerton *hton,
	THD*	thd,	/*!< in: user thread handle */
	void*	curview)/*!< in: Consistent read view to be closed */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	read_cursor_view_close_for_mysql(check_trx_exists(thd),
					 (cursor_view_t*) curview);
}

/*******************************************************************//**
Set the given consistent cursor view to a transaction which is created
if the corresponding MySQL thread still lacks one. If the given
consistent cursor view is NULL global read view of a transaction is
restored to a transaction read view. */
static
void
innobase_set_cursor_view(
/*=====================*/
        handlerton *hton,
	THD*	thd,	/*!< in: user thread handle */
	void*	curview)/*!< in: Consistent cursor view to be set */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	read_cursor_set_for_mysql(check_trx_exists(thd),
				  (cursor_view_t*) curview);
}


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/***********************************************************************
Check whether any of the given columns is being renamed in the table. */
static
bool
column_is_being_renamed(
/*====================*/
					/* out: true if any of col_names is
					being renamed in table */
	TABLE*		table,		/* in: MySQL table */
	uint		n_cols,		/* in: number of columns */
	const char**	col_names)	/* in: names of the columns */
{
	uint		j;
	uint		k;
	Field*		field;
	const char*	col_name;

	for (j = 0; j < n_cols; j++) {
		col_name = col_names[j];
		for (k = 0; k < table->s->fields; k++) {
			field = table->field[k];
			if ((field->flags & FIELD_IS_RENAMED)
			    && innobase_strcasecmp(field->field_name,
						   col_name) == 0) {
				return(true);
			}
		}
	}

	return(false);
}

/***********************************************************************
Check whether a column in table "table" is being renamed and if this column
is part of a foreign key, either part of another table, referencing this
table or part of this table, referencing another table. */
static
bool
foreign_key_column_is_being_renamed(
/*================================*/
					/* out: true if a column that
					participates in a foreign key definition
					is being renamed */
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
	TABLE*		table)		/* in: MySQL table */
{
	dict_foreign_t*	foreign;

	/* check whether there are foreign keys at all */
	if (UT_LIST_GET_LEN(prebuilt->table->foreign_list) == 0
	    && UT_LIST_GET_LEN(prebuilt->table->referenced_list) == 0) {
		/* no foreign keys involved with prebuilt->table */

		return(false);
	}

	row_mysql_lock_data_dictionary(prebuilt->trx);

	/* Check whether any column in the foreign key constraints which refer
	to this table is being renamed. */
	for (foreign = UT_LIST_GET_FIRST(prebuilt->table->referenced_list);
	     foreign != NULL;
	     foreign = UT_LIST_GET_NEXT(referenced_list, foreign)) {

		if (column_is_being_renamed(table, foreign->n_fields,
					    foreign->referenced_col_names)) {

			row_mysql_unlock_data_dictionary(prebuilt->trx);
			return(true);
		}
	}

	/* Check whether any column in the foreign key constraints in the
	table is being renamed. */
	for (foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);
	     foreign != NULL;
	     foreign = UT_LIST_GET_NEXT(foreign_list, foreign)) {

		if (column_is_being_renamed(table, foreign->n_fields,
					    foreign->foreign_col_names)) {

			row_mysql_unlock_data_dictionary(prebuilt->trx);
			return(true);
		}
	}

	row_mysql_unlock_data_dictionary(prebuilt->trx);

	return(false);
}

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UNIV_INTERN
bool
ha_innobase::check_if_incompatible_data(
	HA_CREATE_INFO*	info,
	uint		table_changes)
{
	if (table_changes != IS_EQUAL_YES) {

		return(COMPATIBLE_DATA_NO);
	}

	/* Check that auto_increment value was not changed */
	if ((info->used_fields & HA_CREATE_USED_AUTO) &&
		info->auto_increment_value != 0) {

		return(COMPATIBLE_DATA_NO);
	}

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	/* Check if a column participating in a foreign key is being renamed.
	There is no mechanism for updating InnoDB foreign key definitions. */
	if (foreign_key_column_is_being_renamed(prebuilt, table)) {

		return COMPATIBLE_DATA_NO;
	}

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	/* Check that row format didn't change */
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	if ((info->used_fields & HA_CREATE_USED_ROW_FORMAT)
	    && info->row_type != ROW_TYPE_DEFAULT
	    && info->row_type != get_row_type()) {
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		return(COMPATIBLE_DATA_NO);
	}

	/* Specifying KEY_BLOCK_SIZE requests a rebuild of the table. */
	if (info->used_fields & HA_CREATE_USED_KEY_BLOCK_SIZE) {
		return(COMPATIBLE_DATA_NO);
	}

	return(COMPATIBLE_DATA_YES);
}

/************************************************************//**
Validate the file format name and return its corresponding id.
@return	valid file format id */
static
uint
innobase_file_format_name_lookup(
/*=============================*/
	const char*	format_name)	/*!< in: pointer to file format name */
{
	char*	endp;
	uint	format_id;

	ut_a(format_name != NULL);

	/* The format name can contain the format id itself instead of
	the name and we check for that. */
	format_id = (uint) strtoul(format_name, &endp, 10);

	/* Check for valid parse. */
	if (*endp == '\0' && *format_name != '\0') {

		if (format_id <= DICT_TF_FORMAT_MAX) {

			return(format_id);
		}
	} else {

		for (format_id = 0; format_id <= DICT_TF_FORMAT_MAX;
		     format_id++) {
			const char*	name;

			name = trx_sys_file_format_id_to_name(format_id);

			if (!innobase_strcasecmp(format_name, name)) {

				return(format_id);
			}
		}
	}

	return(DICT_TF_FORMAT_MAX + 1);
}

/************************************************************//**
Validate the file format check value, is it one of "on" or "off",
as a side effect it sets the srv_check_file_format_at_startup variable.
@return	true if config value one of "on" or  "off" */
static
bool
innobase_file_format_check_on_off(
/*==============================*/
	const char*	format_check)	/*!< in: parameter value */
{
	bool		ret = true;

	if (!innobase_strcasecmp(format_check, "off")) {

		/* Set the value to disable checking. */
		srv_check_file_format_at_startup = DICT_TF_FORMAT_MAX + 1;

	} else if (!innobase_strcasecmp(format_check, "on")) {

		/* Set the value to the lowest supported format. */
		srv_check_file_format_at_startup = DICT_TF_FORMAT_51;
	} else {
		ret = FALSE;
	}

	return(ret);
}

/************************************************************//**
Validate the file format check config parameters, as a side effect it
sets the srv_check_file_format_at_startup variable.
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@return the format_id if valid config value, otherwise, return -1 */
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int
innobase_file_format_validate_and_set(
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/*================================*/
	const char*	format_check)	/*!< in: parameter value */
{
	uint		format_id;

	format_id = innobase_file_format_name_lookup(format_check);

	if (format_id < DICT_TF_FORMAT_MAX + 1) {
		srv_check_file_format_at_startup = format_id;
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		return((int) format_id);
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	} else {
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		return(-1);
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	}
}

/*************************************************************//**
Check if it is a valid file format. This function is registered as
a callback with MySQL.
@return	0 for valid file format */
static
int
innodb_file_format_name_validate(
/*=============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	file_format_input;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);

	ut_a(save != NULL);
	ut_a(value != NULL);

	file_format_input = value->val_str(value, buff, &len);

	if (file_format_input != NULL) {
		uint	format_id;

		format_id = innobase_file_format_name_lookup(
			file_format_input);

		if (format_id <= DICT_TF_FORMAT_MAX) {

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			/* Save a pointer to the name in the
			'file_format_name_map' constant array. */
			*static_cast<const char**>(save) =
			    trx_sys_file_format_id_to_name(format_id);

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			return(0);
		}
	}

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	*static_cast<const char**>(save) = NULL;
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	return(1);
}

/****************************************************************//**
Update the system variable innodb_file_format using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_file_format_name_update(
/*===========================*/
	THD*				thd,		/*!< in: thread handle */
	struct st_mysql_sys_var*	var,		/*!< in: pointer to
							system variable */
	void*				var_ptr,	/*!< out: where the
							formal string goes */
	const void*			save)		/*!< in: immediate result
							from check function */
{
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	const char* format_name;

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	ut_a(var_ptr != NULL);
	ut_a(save != NULL);

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	format_name = *static_cast<const char*const*>(save);

	if (format_name) {
		uint	format_id;

		format_id = innobase_file_format_name_lookup(format_name);
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		if (format_id <= DICT_TF_FORMAT_MAX) {
			srv_file_format = format_id;
		}
	}

	*static_cast<const char**>(var_ptr)
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		= trx_sys_file_format_id_to_name(srv_file_format);
}

/*************************************************************//**
Check if valid argument to innodb_file_format_check. This
function is registered as a callback with MySQL.
@return	0 for valid file format */
static
int
innodb_file_format_check_validate(
/*==============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	file_format_input;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);
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	int		format_id;
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	ut_a(save != NULL);
	ut_a(value != NULL);

	file_format_input = value->val_str(value, buff, &len);

	if (file_format_input != NULL) {

		/* Check if user set on/off, we want to print a suitable
		message if they did so. */

		if (innobase_file_format_check_on_off(file_format_input)) {
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			push_warning_printf(thd,
				MYSQL_ERROR::WARN_LEVEL_WARN,
				ER_WRONG_ARGUMENTS,
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				"InnoDB: invalid innodb_file_format_check "
				"value; on/off can only be set at startup or "
				"in the configuration file");
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		} else {
			format_id = innobase_file_format_validate_and_set(
							file_format_input);
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			if (format_id >= 0) {
				/* Save a pointer to the name in the
				'file_format_name_map' constant array. */
				*static_cast<const char**>(save) =
				    trx_sys_file_format_id_to_name(
							(uint)format_id);
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				return(0);
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			} else {
				push_warning_printf(thd,
				  MYSQL_ERROR::WARN_LEVEL_WARN,
				  ER_WRONG_ARGUMENTS,
				  "InnoDB: invalid innodb_file_format_check "
				  "value; can be any format up to %s "
				  "or its equivalent numeric id",
				  trx_sys_file_format_id_to_name(
						DICT_TF_FORMAT_MAX));
			}
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		}
	}

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	*static_cast<const char**>(save) = NULL;
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	return(1);
}

/****************************************************************//**
Update the system variable innodb_file_format_check using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_file_format_check_update(
/*============================*/
	THD*				thd,		/*!< in: thread handle */
	struct st_mysql_sys_var*	var,		/*!< in: pointer to
							system variable */
	void*				var_ptr,	/*!< out: where the
							formal string goes */
	const void*			save)		/*!< in: immediate result
							from check function */
{
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	const char*	format_name_in;
	const char**	format_name_out;
	uint		format_id;
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	ut_a(save != NULL);
	ut_a(var_ptr != NULL);

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	format_name_in = *static_cast<const char*const*>(save);

	if (!format_name_in) {

		return;
	}

	format_id = innobase_file_format_name_lookup(format_name_in);

	if (format_id > DICT_TF_FORMAT_MAX) {
		/* DEFAULT is "on", which is invalid at runtime. */
		push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
				    ER_WRONG_ARGUMENTS,
				    "Ignoring SET innodb_file_format=%s",
				    format_name_in);
		return;
	}

	format_name_out = static_cast<const char**>(var_ptr);
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	/* Update the max format id in the system tablespace. */
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	if (trx_sys_file_format_max_set(format_id, format_name_out)) {
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		ut_print_timestamp(stderr);
		fprintf(stderr,
			" [Info] InnoDB: the file format in the system "
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			"tablespace is now set to %s.\n", *format_name_out);
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	}
}

/****************************************************************//**
Update the system variable innodb_adaptive_hash_index using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_adaptive_hash_index_update(
/*==============================*/
	THD*				thd,		/*!< in: thread handle */
	struct st_mysql_sys_var*	var,		/*!< in: pointer to
							system variable */
	void*				var_ptr,	/*!< out: where the
							formal string goes */
	const void*			save)		/*!< in: immediate result
							from check function */
{
	if (*(my_bool*) save) {
		btr_search_enable();
	} else {
		btr_search_disable();
	}
}

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/****************************************************************//**
Update the system variable innodb_old_blocks_pct using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_old_blocks_pct_update(
/*=========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	innobase_old_blocks_pct = buf_LRU_old_ratio_update(
		*static_cast<const uint*>(save), TRUE);
}

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/*************************************************************//**
Check if it is a valid value of innodb_change_buffering.  This function is
registered as a callback with MySQL.
@return	0 for valid innodb_change_buffering */
static
int
innodb_change_buffering_validate(
/*=============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	change_buffering_input;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);

	ut_a(save != NULL);
	ut_a(value != NULL);

	change_buffering_input = value->val_str(value, buff, &len);

	if (change_buffering_input != NULL) {
		ulint	use;

		for (use = 0; use < UT_ARR_SIZE(innobase_change_buffering_values);
		     use++) {
			if (!innobase_strcasecmp(
				    change_buffering_input,
				    innobase_change_buffering_values[use])) {
				*(ibuf_use_t*) save = (ibuf_use_t) use;
				return(0);
			}
		}
	}

	return(1);
}

/****************************************************************//**
Update the system variable innodb_change_buffering using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_change_buffering_update(
/*===========================*/
	THD*				thd,		/*!< in: thread handle */
	struct st_mysql_sys_var*	var,		/*!< in: pointer to
							system variable */
	void*				var_ptr,	/*!< out: where the
							formal string goes */
	const void*			save)		/*!< in: immediate result
							from check function */
{
	ut_a(var_ptr != NULL);
	ut_a(save != NULL);
	ut_a((*(ibuf_use_t*) save) < IBUF_USE_COUNT);

	ibuf_use = *(const ibuf_use_t*) save;

	*(const char**) var_ptr = innobase_change_buffering_values[ibuf_use];
}

static int show_innodb_vars(THD *thd, SHOW_VAR *var, char *buff)
{
  innodb_export_status();
  var->type= SHOW_ARRAY;
  var->value= (char *) &innodb_status_variables;
  return 0;
}

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/***********************************************************************
This function checks each index name for a table against reserved
system default primary index name 'GEN_CLUST_INDEX'. If a name matches,
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this function pushes an warning message to the client, and returns true. */
extern "C" UNIV_INTERN
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bool
innobase_index_name_is_reserved(
/*============================*/
					/* out: true if an index name
					matches the reserved name */
	const trx_t*	trx,		/* in: InnoDB transaction handle */
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	const KEY*	key_info,	/* in: Indexes to be created */
	ulint		num_of_keys)	/* in: Number of indexes to
					be created. */
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{
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	const KEY*	key;
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	uint		key_num;	/* index number */

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	for (key_num = 0; key_num < num_of_keys; key_num++) {
		key = &key_info[key_num];
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		if (innobase_strcasecmp(key->name,
					innobase_index_reserve_name) == 0) {
			/* Push warning to mysql */
			push_warning_printf((THD*) trx->mysql_thd,
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					    MYSQL_ERROR::WARN_LEVEL_WARN,
					    ER_WRONG_NAME_FOR_INDEX,
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					    "Cannot Create Index with name "
					    "'%s'. The name is reserved "
					    "for the system default primary "
					    "index.",
					    innobase_index_reserve_name);

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			my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0),
				 innobase_index_reserve_name);

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			return(true);
		}
	}

	return(false);
}

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static SHOW_VAR innodb_status_variables_export[]= {
  {"Innodb",                   (char*) &show_innodb_vars, SHOW_FUNC},
  {NullS, NullS, SHOW_LONG}
};

static struct st_mysql_storage_engine innobase_storage_engine=
{ MYSQL_HANDLERTON_INTERFACE_VERSION };

/* plugin options */
static MYSQL_SYSVAR_BOOL(checksums, innobase_use_checksums,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Enable InnoDB checksums validation (enabled by default). "
  "Disable with --skip-innodb-checksums.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_STR(data_home_dir, innobase_data_home_dir,
  PLUGIN_VAR_READONLY,
  "The common part for InnoDB table spaces.",
  NULL, NULL, NULL);

static MYSQL_SYSVAR_BOOL(doublewrite, innobase_use_doublewrite,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Enable InnoDB doublewrite buffer (enabled by default). "
  "Disable with --skip-innodb-doublewrite.",
  NULL, NULL, TRUE);

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static MYSQL_SYSVAR_ULONG(io_capacity, srv_io_capacity,
  PLUGIN_VAR_RQCMDARG,
  "Number of IOPs the server can do. Tunes the background IO rate",
  NULL, NULL, 200, 100, ~0L, 0);

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static MYSQL_SYSVAR_ULONG(fast_shutdown, innobase_fast_shutdown,
  PLUGIN_VAR_OPCMDARG,
  "Speeds up the shutdown process of the InnoDB storage engine. Possible "
  "values are 0, 1 (faster)"
  /*
    NetWare can't close unclosed files, can't automatically kill remaining
    threads, etc, so on this OS we disable the crash-like InnoDB shutdown.
  */
  IF_NETWARE("", " or 2 (fastest - crash-like)")
  ".",
  NULL, NULL, 1, 0, IF_NETWARE(1,2), 0);

static MYSQL_SYSVAR_BOOL(file_per_table, srv_file_per_table,
  PLUGIN_VAR_NOCMDARG,
  "Stores each InnoDB table to an .ibd file in the database dir.",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_STR(file_format, innobase_file_format_name,
  PLUGIN_VAR_RQCMDARG,
  "File format to use for new tables in .ibd files.",
  innodb_file_format_name_validate,
  innodb_file_format_name_update, "Antelope");

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/* If a new file format is introduced, the file format
name needs to be updated accordingly. Please refer to
file_format_name_map[] defined in trx0sys.c for the next
file format name. */
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static MYSQL_SYSVAR_STR(file_format_check, innobase_file_format_check,
  PLUGIN_VAR_OPCMDARG,
  "The highest file format in the tablespace.",
  innodb_file_format_check_validate,
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  innodb_file_format_check_update, "Barracuda");
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static MYSQL_SYSVAR_ULONG(flush_log_at_trx_commit, srv_flush_log_at_trx_commit,
  PLUGIN_VAR_OPCMDARG,
  "Set to 0 (write and flush once per second),"
  " 1 (write and flush at each commit)"
  " or 2 (write at commit, flush once per second).",
  NULL, NULL, 1, 0, 2, 0);

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static MYSQL_SYSVAR_STR(flush_method, innobase_file_flush_method,
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  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "With which method to flush data.", NULL, NULL, NULL);

static MYSQL_SYSVAR_BOOL(locks_unsafe_for_binlog, innobase_locks_unsafe_for_binlog,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Force InnoDB to not use next-key locking, to use only row-level locking.",
  NULL, NULL, FALSE);

#ifdef UNIV_LOG_ARCHIVE
static MYSQL_SYSVAR_STR(log_arch_dir, innobase_log_arch_dir,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Where full logs should be archived.", NULL, NULL, NULL);

static MYSQL_SYSVAR_BOOL(log_archive, innobase_log_archive,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Set to 1 if you want to have logs archived.", NULL, NULL, FALSE);
#endif /* UNIV_LOG_ARCHIVE */

static MYSQL_SYSVAR_STR(log_group_home_dir, innobase_log_group_home_dir,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Path to InnoDB log files.", NULL, NULL, NULL);

static MYSQL_SYSVAR_ULONG(max_dirty_pages_pct, srv_max_buf_pool_modified_pct,
  PLUGIN_VAR_RQCMDARG,
  "Percentage of dirty pages allowed in bufferpool.",
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  NULL, NULL, 75, 0, 99, 0);

static MYSQL_SYSVAR_BOOL(adaptive_flushing, srv_adaptive_flushing,
  PLUGIN_VAR_NOCMDARG,
  "Attempt flushing dirty pages to avoid IO bursts at checkpoints.",
  NULL, NULL, TRUE);
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static MYSQL_SYSVAR_ULONG(max_purge_lag, srv_max_purge_lag,
  PLUGIN_VAR_RQCMDARG,
  "Desired maximum length of the purge queue (0 = no limit)",
  NULL, NULL, 0, 0, ~0L, 0);

static MYSQL_SYSVAR_BOOL(rollback_on_timeout, innobase_rollback_on_timeout,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Roll back the complete transaction on lock wait timeout, for 4.x compatibility (disabled by default)",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(status_file, innobase_create_status_file,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_NOSYSVAR,
  "Enable SHOW INNODB STATUS output in the innodb_status.<pid> file",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(stats_on_metadata, innobase_stats_on_metadata,
  PLUGIN_VAR_OPCMDARG,
  "Enable statistics gathering for metadata commands such as SHOW TABLE STATUS (on by default)",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_ULONGLONG(stats_sample_pages, srv_stats_sample_pages,
  PLUGIN_VAR_RQCMDARG,
  "The number of index pages to sample when calculating statistics (default 8)",
  NULL, NULL, 8, 1, ~0ULL, 0);

static MYSQL_SYSVAR_BOOL(adaptive_hash_index, btr_search_enabled,
  PLUGIN_VAR_OPCMDARG,
  "Enable InnoDB adaptive hash index (enabled by default).  "
  "Disable with --skip-innodb-adaptive-hash-index.",
  NULL, innodb_adaptive_hash_index_update, TRUE);

static MYSQL_SYSVAR_ULONG(replication_delay, srv_replication_delay,
  PLUGIN_VAR_RQCMDARG,
  "Replication thread delay (ms) on the slave server if "
  "innodb_thread_concurrency is reached (0 by default)",
  NULL, NULL, 0, 0, ~0UL, 0);

static MYSQL_SYSVAR_LONG(additional_mem_pool_size, innobase_additional_mem_pool_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Size of a memory pool InnoDB uses to store data dictionary information and other internal data structures.",
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  NULL, NULL, 8*1024*1024L, 512*1024L, LONG_MAX, 1024);
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static MYSQL_SYSVAR_ULONG(autoextend_increment, srv_auto_extend_increment,
  PLUGIN_VAR_RQCMDARG,
  "Data file autoextend increment in megabytes",
  NULL, NULL, 8L, 1L, 1000L, 0);

static MYSQL_SYSVAR_LONGLONG(buffer_pool_size, innobase_buffer_pool_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "The size of the memory buffer InnoDB uses to cache data and indexes of its tables.",
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  NULL, NULL, 128*1024*1024L, 5*1024*1024L, LONGLONG_MAX, 1024*1024L);
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static MYSQL_SYSVAR_ULONG(commit_concurrency, innobase_commit_concurrency,
  PLUGIN_VAR_RQCMDARG,
  "Helps in performance tuning in heavily concurrent environments.",
  innobase_commit_concurrency_validate, NULL, 0, 0, 1000, 0);

static MYSQL_SYSVAR_ULONG(concurrency_tickets, srv_n_free_tickets_to_enter,
  PLUGIN_VAR_RQCMDARG,
  "Number of times a thread is allowed to enter InnoDB within the same SQL query after it has once got the ticket",
  NULL, NULL, 500L, 1L, ~0L, 0);

static MYSQL_SYSVAR_LONG(file_io_threads, innobase_file_io_threads,
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  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY | PLUGIN_VAR_NOSYSVAR,
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  "Number of file I/O threads in InnoDB.",
  NULL, NULL, 4, 4, 64, 0);

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static MYSQL_SYSVAR_ULONG(read_io_threads, innobase_read_io_threads,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of background read I/O threads in InnoDB.",
  NULL, NULL, 4, 1, 64, 0);

static MYSQL_SYSVAR_ULONG(write_io_threads, innobase_write_io_threads,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of background write I/O threads in InnoDB.",
  NULL, NULL, 4, 1, 64, 0);

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static MYSQL_SYSVAR_LONG(force_recovery, innobase_force_recovery,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Helps to save your data in case the disk image of the database becomes corrupt.",
  NULL, NULL, 0, 0, 6, 0);

static MYSQL_SYSVAR_LONG(log_buffer_size, innobase_log_buffer_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "The size of the buffer which InnoDB uses to write log to the log files on disk.",
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  NULL, NULL, 8*1024*1024L, 256*1024L, LONG_MAX, 1024);
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static MYSQL_SYSVAR_LONGLONG(log_file_size, innobase_log_file_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Size of each log file in a log group.",
  NULL, NULL, 5*1024*1024L, 1*1024*1024L, LONGLONG_MAX, 1024*1024L);

static MYSQL_SYSVAR_LONG(log_files_in_group, innobase_log_files_in_group,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of log files in the log group. InnoDB writes to the files in a circular fashion. Value 3 is recommended here.",
  NULL, NULL, 2, 2, 100, 0);

static MYSQL_SYSVAR_LONG(mirrored_log_groups, innobase_mirrored_log_groups,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of identical copies of log groups we keep for the database. Currently this should be set to 1.",
  NULL, NULL, 1, 1, 10, 0);

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static MYSQL_SYSVAR_UINT(old_blocks_pct, innobase_old_blocks_pct,
  PLUGIN_VAR_RQCMDARG,
  "Percentage of the buffer pool to reserve for 'old' blocks.",
  NULL, innodb_old_blocks_pct_update, 100 * 3 / 8, 5, 95, 0);

static MYSQL_SYSVAR_UINT(old_blocks_time, buf_LRU_old_threshold_ms,
  PLUGIN_VAR_RQCMDARG,
  "Move blocks to the 'new' end of the buffer pool if the first access"
  " was at least this many milliseconds ago."
  " The timeout is disabled if 0 (the default).",
  NULL, NULL, 0, 0, UINT_MAX32, 0);

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static MYSQL_SYSVAR_LONG(open_files, innobase_open_files,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "How many files at the maximum InnoDB keeps open at the same time.",
  NULL, NULL, 300L, 10L, LONG_MAX, 0);

static MYSQL_SYSVAR_ULONG(sync_spin_loops, srv_n_spin_wait_rounds,
  PLUGIN_VAR_RQCMDARG,
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  "Count of spin-loop rounds in InnoDB mutexes (30 by default)",
  NULL, NULL, 30L, 0L, ~0L, 0);
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static MYSQL_SYSVAR_ULONG(spin_wait_delay, srv_spin_wait_delay,
  PLUGIN_VAR_OPCMDARG,
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  "Maximum delay between polling for a spin lock (6 by default)",
  NULL, NULL, 6L, 0L, ~0L, 0);
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static MYSQL_SYSVAR_ULONG(thread_concurrency, srv_thread_concurrency,
  PLUGIN_VAR_RQCMDARG,
  "Helps in performance tuning in heavily concurrent environments. Sets the maximum number of threads allowed inside InnoDB. Value 0 will disable the thread throttling.",
  NULL, NULL, 0, 0, 1000, 0);

static MYSQL_SYSVAR_ULONG(thread_sleep_delay, srv_thread_sleep_delay,
  PLUGIN_VAR_RQCMDARG,
  "Time of innodb thread sleeping before joining InnoDB queue (usec). Value 0 disable a sleep",
  NULL, NULL, 10000L, 0L, ~0L, 0);

static MYSQL_SYSVAR_STR(data_file_path, innobase_data_file_path,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Path to individual files and their sizes.",
  NULL, NULL, NULL);

static MYSQL_SYSVAR_LONG(autoinc_lock_mode, innobase_autoinc_lock_mode,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "The AUTOINC lock modes supported by InnoDB:               "
  "0 => Old style AUTOINC locking (for backward"
  " compatibility)                                           "
  "1 => New style AUTOINC locking                            "
  "2 => No AUTOINC locking (unsafe for SBR)",
  NULL, NULL,
  AUTOINC_NEW_STYLE_LOCKING,	/* Default setting */
  AUTOINC_OLD_STYLE_LOCKING,	/* Minimum value */
  AUTOINC_NO_LOCKING, 0);	/* Maximum value */

static MYSQL_SYSVAR_STR(version, innodb_version_str,
  PLUGIN_VAR_NOCMDOPT | PLUGIN_VAR_READONLY,
  "InnoDB version", NULL, NULL, INNODB_VERSION_STR);

static MYSQL_SYSVAR_BOOL(use_sys_malloc, srv_use_sys_malloc,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Use OS memory allocator instead of InnoDB's internal memory allocator",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_STR(change_buffering, innobase_change_buffering,
  PLUGIN_VAR_RQCMDARG,
  "Buffer changes to reduce random access: "
  "OFF, ON, inserting, deleting, changing, or purging.",
  innodb_change_buffering_validate,
  innodb_change_buffering_update, NULL);

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static MYSQL_SYSVAR_ULONG(read_ahead_threshold, srv_read_ahead_threshold,
  PLUGIN_VAR_RQCMDARG,
  "Number of pages that must be accessed sequentially for InnoDB to"
  "trigger a readahead.",
  NULL, NULL, 56, 0, 64, 0);

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static struct st_mysql_sys_var* innobase_system_variables[]= {
  MYSQL_SYSVAR(additional_mem_pool_size),
  MYSQL_SYSVAR(autoextend_increment),
  MYSQL_SYSVAR(buffer_pool_size),
  MYSQL_SYSVAR(checksums),
  MYSQL_SYSVAR(commit_concurrency),
  MYSQL_SYSVAR(concurrency_tickets),
  MYSQL_SYSVAR(data_file_path),
  MYSQL_SYSVAR(data_home_dir),
  MYSQL_SYSVAR(doublewrite),
  MYSQL_SYSVAR(fast_shutdown),
  MYSQL_SYSVAR(file_io_threads),
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  MYSQL_SYSVAR(read_io_threads),
  MYSQL_SYSVAR(write_io_threads),
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  MYSQL_SYSVAR(file_per_table),
  MYSQL_SYSVAR(file_format),
  MYSQL_SYSVAR(file_format_check),
  MYSQL_SYSVAR(flush_log_at_trx_commit),
  MYSQL_SYSVAR(flush_method),
  MYSQL_SYSVAR(force_recovery),
  MYSQL_SYSVAR(locks_unsafe_for_binlog),
  MYSQL_SYSVAR(lock_wait_timeout),
#ifdef UNIV_LOG_ARCHIVE
  MYSQL_SYSVAR(log_arch_dir),
  MYSQL_SYSVAR(log_archive),
#endif /* UNIV_LOG_ARCHIVE */
  MYSQL_SYSVAR(log_buffer_size),
  MYSQL_SYSVAR(log_file_size),
  MYSQL_SYSVAR(log_files_in_group),
  MYSQL_SYSVAR(log_group_home_dir),
  MYSQL_SYSVAR(max_dirty_pages_pct),
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  MYSQL_SYSVAR(adaptive_flushing),
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  MYSQL_SYSVAR(max_purge_lag),
  MYSQL_SYSVAR(mirrored_log_groups),
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  MYSQL_SYSVAR(old_blocks_pct),
  MYSQL_SYSVAR(old_blocks_time),
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  MYSQL_SYSVAR(open_files),
  MYSQL_SYSVAR(rollback_on_timeout),
  MYSQL_SYSVAR(stats_on_metadata),
  MYSQL_SYSVAR(stats_sample_pages),
  MYSQL_SYSVAR(adaptive_hash_index),
  MYSQL_SYSVAR(replication_delay),
  MYSQL_SYSVAR(status_file),
  MYSQL_SYSVAR(strict_mode),
  MYSQL_SYSVAR(support_xa),
  MYSQL_SYSVAR(sync_spin_loops),
  MYSQL_SYSVAR(spin_wait_delay),
  MYSQL_SYSVAR(table_locks),
  MYSQL_SYSVAR(thread_concurrency),
  MYSQL_SYSVAR(thread_sleep_delay),
  MYSQL_SYSVAR(autoinc_lock_mode),
  MYSQL_SYSVAR(version),
  MYSQL_SYSVAR(use_sys_malloc),
  MYSQL_SYSVAR(change_buffering),
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  MYSQL_SYSVAR(read_ahead_threshold),
  MYSQL_SYSVAR(io_capacity),
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  NULL
};

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mysql_declare_plugin(innodb_plugin)
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{
  MYSQL_STORAGE_ENGINE_PLUGIN,
  &innobase_storage_engine,
  innobase_hton_name,
  "Innobase Oy",
  "Supports transactions, row-level locking, and foreign keys",
  PLUGIN_LICENSE_GPL,
  innobase_init, /* Plugin Init */
  NULL, /* Plugin Deinit */
  INNODB_VERSION_SHORT,
  innodb_status_variables_export,/* status variables             */
  innobase_system_variables, /* system variables */
  NULL /* reserved */
},
i_s_innodb_trx,
i_s_innodb_locks,
i_s_innodb_lock_waits,
i_s_innodb_cmp,
i_s_innodb_cmp_reset,
i_s_innodb_cmpmem,
i_s_innodb_cmpmem_reset
mysql_declare_plugin_end;

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/** @brief Initialize the default value of innodb_commit_concurrency.

Once InnoDB is running, the innodb_commit_concurrency must not change
from zero to nonzero. (Bug #42101)

The initial default value is 0, and without this extra initialization,
SET GLOBAL innodb_commit_concurrency=DEFAULT would set the parameter
to 0, even if it was initially set to nonzero at the command line
or configuration file. */
static
void
innobase_commit_concurrency_init_default(void)
/*==========================================*/
{
	MYSQL_SYSVAR_NAME(commit_concurrency).def_val
		= innobase_commit_concurrency;
}

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#ifdef UNIV_COMPILE_TEST_FUNCS

typedef struct innobase_convert_name_test_struct {
	char*		buf;
	ulint		buflen;
	const char*	id;
	ulint		idlen;
	void*		thd;
	ibool		file_id;

	const char*	expected;
} innobase_convert_name_test_t;

void
test_innobase_convert_name()
{
	char	buf[1024];
	ulint	i;

	innobase_convert_name_test_t test_input[] = {
		{buf, sizeof(buf), "abcd", 4, NULL, TRUE, "\"abcd\""},
		{buf, 7, "abcd", 4, NULL, TRUE, "\"abcd\""},
		{buf, 6, "abcd", 4, NULL, TRUE, "\"abcd\""},
		{buf, 5, "abcd", 4, NULL, TRUE, "\"abc\""},
		{buf, 4, "abcd", 4, NULL, TRUE, "\"ab\""},

		{buf, sizeof(buf), "ab@0060cd", 9, NULL, TRUE, "\"ab`cd\""},
		{buf, 9, "ab@0060cd", 9, NULL, TRUE, "\"ab`cd\""},
		{buf, 8, "ab@0060cd", 9, NULL, TRUE, "\"ab`cd\""},
		{buf, 7, "ab@0060cd", 9, NULL, TRUE, "\"ab`cd\""},
		{buf, 6, "ab@0060cd", 9, NULL, TRUE, "\"ab`c\""},
		{buf, 5, "ab@0060cd", 9, NULL, TRUE, "\"ab`\""},
		{buf, 4, "ab@0060cd", 9, NULL, TRUE, "\"ab\""},

		{buf, sizeof(buf), "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#ab\"\"cd\""},
		{buf, 17, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#ab\"\"cd\""},
		{buf, 16, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#ab\"\"c\""},
		{buf, 15, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#ab\"\"\""},
		{buf, 14, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#ab\""},
		{buf, 13, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#ab\""},
		{buf, 12, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#a\""},
		{buf, 11, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50#\""},
		{buf, 10, "ab\"cd", 5, NULL, TRUE,
			"\"#mysql50\""},

		{buf, sizeof(buf), "ab/cd", 5, NULL, TRUE, "\"ab\".\"cd\""},
		{buf, 9, "ab/cd", 5, NULL, TRUE, "\"ab\".\"cd\""},
		{buf, 8, "ab/cd", 5, NULL, TRUE, "\"ab\".\"c\""},
		{buf, 7, "ab/cd", 5, NULL, TRUE, "\"ab\".\"\""},
		{buf, 6, "ab/cd", 5, NULL, TRUE, "\"ab\"."},
		{buf, 5, "ab/cd", 5, NULL, TRUE, "\"ab\"."},
		{buf, 4, "ab/cd", 5, NULL, TRUE, "\"ab\""},
		{buf, 3, "ab/cd", 5, NULL, TRUE, "\"a\""},
		{buf, 2, "ab/cd", 5, NULL, TRUE, "\"\""},
		/* XXX probably "" is a better result in this case
		{buf, 1, "ab/cd", 5, NULL, TRUE, "."},
		*/
		{buf, 0, "ab/cd", 5, NULL, TRUE, ""},
	};

	for (i = 0; i < sizeof(test_input) / sizeof(test_input[0]); i++) {

		char*	end;
		ibool	ok = TRUE;
		size_t	res_len;

		fprintf(stderr, "TESTING %lu, %s, %lu, %s\n",
			test_input[i].buflen,
			test_input[i].id,
			test_input[i].idlen,
			test_input[i].expected);

		end = innobase_convert_name(
			test_input[i].buf,
			test_input[i].buflen,
			test_input[i].id,
			test_input[i].idlen,
			test_input[i].thd,
			test_input[i].file_id);

		res_len = (size_t) (end - test_input[i].buf);

		if (res_len != strlen(test_input[i].expected)) {

			fprintf(stderr, "unexpected len of the result: %u, "
				"expected: %u\n", (unsigned) res_len,
				(unsigned) strlen(test_input[i].expected));
			ok = FALSE;
		}

		if (memcmp(test_input[i].buf,
			   test_input[i].expected,
			   strlen(test_input[i].expected)) != 0
		    || !ok) {

			fprintf(stderr, "unexpected result: %.*s, "
				"expected: %s\n", (int) res_len,
				test_input[i].buf,
				test_input[i].expected);
			ok = FALSE;
		}

		if (ok) {
			fprintf(stderr, "OK: res: %.*s\n\n", (int) res_len,
				buf);
		} else {
			fprintf(stderr, "FAILED\n\n");
			return;
		}
	}
}

#endif /* UNIV_COMPILE_TEST_FUNCS */