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/* Copyright (C) 2000-2005 MySQL AB & Innobase Oy
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   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; either version 2 of the License, or
   (at your option) any later version.
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   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.
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   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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/* This file defines the InnoDB handler: the interface between MySQL and InnoDB
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NOTE: You can only use noninlined InnoDB functions in this file, because we
have disables the InnoDB inlining in this file. */
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/* TODO list for the InnoDB handler in 5.0:
  - Remove the flag trx->active_trans and look at the InnoDB
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    trx struct state field
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  - fix savepoint functions to use savepoint storage area
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  - 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?
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*/
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#ifdef USE_PRAGMA_IMPLEMENTATION
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#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
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#include "slave.h"
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#include <m_ctype.h>
#include <hash.h>
#include <myisampack.h>
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#include <mysys_err.h>
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#include <my_sys.h>
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#define MAX_ULONG_BIT ((ulong) 1 << (sizeof(ulong)*8-1))

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#include "ha_innodb.h"
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pthread_mutex_t innobase_share_mutex, /* to protect innobase_open_files */
                prepare_commit_mutex; /* to force correct commit order in
				      binlog */
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ulong commit_threads= 0;
pthread_mutex_t commit_threads_m;
pthread_cond_t commit_cond;
pthread_mutex_t commit_cond_m;
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bool innodb_inited= 0;
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/*-----------------------------------------------------------------*/
/* These variables are used to implement (semi-)synchronous MySQL binlog
replication for InnoDB tables. */

pthread_cond_t  innobase_repl_cond;             /* Posix cond variable;
                                                this variable is signaled
                                                when enough binlog has been
                                                sent to slave, so that a
                                                waiting trx can return the
                                                'ok' message to the client
                                                for a commit */
pthread_mutex_t innobase_repl_cond_mutex;       /* Posix cond variable mutex
                                                that also protects the next
                                                innobase_repl_... variables */
uint            innobase_repl_state;            /* 1 if synchronous replication
                                                is switched on and is working
                                                ok; else 0 */
uint            innobase_repl_file_name_inited  = 0; /* This is set to 1 when
                                                innobase_repl_file_name
                                                contains meaningful data */
char*           innobase_repl_file_name;        /* The binlog name up to which
                                                we have sent some binlog to
                                                the slave */
my_off_t        innobase_repl_pos;              /* The position in that file
                                                up to which we have sent the
                                                binlog to the slave */
uint            innobase_repl_n_wait_threads    = 0; /* This tells how many
                                                transactions currently are
                                                waiting for the binlog to be
                                                sent to the client */
uint            innobase_repl_wait_file_name_inited = 0; /* This is set to 1
                                                when we know the 'smallest'
                                                wait position */
char*           innobase_repl_wait_file_name;   /* NULL, or the 'smallest'
                                                innobase_repl_file_name that
                                                a transaction is waiting for */
my_off_t        innobase_repl_wait_pos;         /* The smallest position in
                                                that file that a trx is
                                                waiting for: the trx can
                                                proceed and send an 'ok' to
                                                the client when MySQL has sent
                                                the binlog up to this position
                                                to the slave */
/*-----------------------------------------------------------------*/



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/* Store MySQL definition of 'byte': in Linux it is char while InnoDB
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uses unsigned char; the header univ.i which we include next defines
'byte' as a macro which expands to 'unsigned char' */

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typedef byte	mysql_byte;
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#define INSIDE_HA_INNOBASE_CC

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/* Include necessary InnoDB headers */
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extern "C" {
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#include "../storage/innobase/include/univ.i"
#include "../storage/innobase/include/os0file.h"
#include "../storage/innobase/include/os0thread.h"
#include "../storage/innobase/include/srv0start.h"
#include "../storage/innobase/include/srv0srv.h"
#include "../storage/innobase/include/trx0roll.h"
#include "../storage/innobase/include/trx0trx.h"
#include "../storage/innobase/include/trx0sys.h"
#include "../storage/innobase/include/mtr0mtr.h"
#include "../storage/innobase/include/row0ins.h"
#include "../storage/innobase/include/row0mysql.h"
#include "../storage/innobase/include/row0sel.h"
#include "../storage/innobase/include/row0upd.h"
#include "../storage/innobase/include/log0log.h"
#include "../storage/innobase/include/lock0lock.h"
#include "../storage/innobase/include/dict0crea.h"
#include "../storage/innobase/include/btr0cur.h"
#include "../storage/innobase/include/btr0btr.h"
#include "../storage/innobase/include/fsp0fsp.h"
#include "../storage/innobase/include/sync0sync.h"
#include "../storage/innobase/include/fil0fil.h"
#include "../storage/innobase/include/trx0xa.h"
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}

#define HA_INNOBASE_ROWS_IN_TABLE 10000 /* to get optimization right */
#define HA_INNOBASE_RANGE_COUNT	  100

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uint 	innobase_init_flags 	= 0;
ulong 	innobase_cache_size 	= 0;
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ulong 	innobase_large_page_size = 0;
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/* The default values for the following, type long or longlong, start-up
parameters are declared in mysqld.cc: */
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long innobase_mirrored_log_groups, innobase_log_files_in_group,
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     innobase_log_buffer_size, innobase_buffer_pool_awe_mem_mb,
     innobase_additional_mem_pool_size, innobase_file_io_threads,
     innobase_lock_wait_timeout, innobase_force_recovery,
     innobase_open_files;

longlong innobase_buffer_pool_size, innobase_log_file_size;
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/* The default values for the following char* start-up parameters
are determined in innobase_init below: */
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char*	innobase_data_home_dir			= NULL;
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char*	innobase_data_file_path 		= NULL;
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char*	innobase_log_group_home_dir		= NULL;
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char*	innobase_log_arch_dir			= NULL;/* unused */
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/* The following has a misleading name: starting from 4.0.5, this also
affects Windows: */
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char*	innobase_unix_file_flush_method		= NULL;

/* Below we have boolean-valued start-up parameters, and their default
values */

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uint	innobase_flush_log_at_trx_commit	= 1;
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ulong	innobase_fast_shutdown			= 1;
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my_bool innobase_log_archive			= FALSE;/* unused */
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my_bool innobase_use_doublewrite    = TRUE;
my_bool innobase_use_checksums      = TRUE;
my_bool innobase_use_large_pages    = FALSE;
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my_bool	innobase_use_native_aio			= FALSE;
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my_bool	innobase_file_per_table			= FALSE;
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my_bool innobase_locks_unsafe_for_binlog        = FALSE;
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my_bool innobase_create_status_file		= FALSE;
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static char *internal_innobase_data_file_path	= NULL;
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/* The following counter is used to convey information to InnoDB
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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
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ulong	innobase_active_counter	= 0;
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char*	innobase_home 	= NULL;

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

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static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)));
static INNOBASE_SHARE *get_share(const char *table_name);
static void free_share(INNOBASE_SHARE *share);
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static int innobase_close_connection(THD* thd);
static int innobase_commit(THD* thd, bool all);
static int innobase_rollback(THD* thd, bool all);
static int innobase_rollback_to_savepoint(THD* thd, void *savepoint);
static int innobase_savepoint(THD* thd, void *savepoint);
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static int innobase_release_savepoint(THD* thd, void *savepoint);
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static handler *innobase_create_handler(TABLE_SHARE *table);
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handlerton innobase_hton = {
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  "InnoDB",
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  SHOW_OPTION_YES,
  "Supports transactions, row-level locking, and foreign keys", 
  DB_TYPE_INNODB,
  innobase_init,
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  0,				/* slot */
  sizeof(trx_named_savept_t),	/* savepoint size. TODO: use it */
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  innobase_close_connection,
  innobase_savepoint,
  innobase_rollback_to_savepoint,
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  innobase_release_savepoint,
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  innobase_commit,		/* commit */
  innobase_rollback,		/* rollback */
  innobase_xa_prepare,		/* prepare */
  innobase_xa_recover,		/* recover */
  innobase_commit_by_xid,	/* commit_by_xid */
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  innobase_rollback_by_xid,     /* rollback_by_xid */
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  innobase_create_cursor_view,
  innobase_set_cursor_view,
  innobase_close_cursor_view,
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  innobase_create_handler,	/* Create a new handler */
  innobase_drop_database,	/* Drop a database */
  innobase_end,			/* Panic call */
  innobase_release_temporary_latches,    /* Release temporary latches */
  innodb_export_status,		/* Update Statistics */
  innobase_start_trx_and_assign_read_view,    /* Start Consistent Snapshot */
  innobase_flush_logs,		/* Flush logs */
  innobase_show_status,		/* Show status */
#ifdef HAVE_REPLICATION
  innobase_repl_report_sent_binlog,    /* Replication Report Sent Binlog */
#else
  NULL,
#endif
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  HTON_NO_FLAGS
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};
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static handler *innobase_create_handler(TABLE_SHARE *table)
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{
  return new ha_innobase(table);
}


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/*********************************************************************
Commits a transaction in an InnoDB database. */

void
innobase_commit_low(
/*================*/
	trx_t*	trx);	/* in: transaction handle */

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struct show_var_st 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},
  {"buffer_pool_pages_latched",
  (char*) &export_vars.innodb_buffer_pool_pages_latched,  SHOW_LONG},
  {"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},
  {"buffer_pool_read_ahead_rnd",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_rnd, SHOW_LONG},
  {"buffer_pool_read_ahead_seq",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_seq, SHOW_LONG},
  {"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},
  {"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},
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  {"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},
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  {"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},
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  {"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}};

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/* General functions */

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/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_enter_innodb(
/*=========================*/
	trx_t*	trx)	/* in: transaction handle */
{
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	if (UNIV_LIKELY(srv_thread_concurrency >= SRV_CONCURRENCY_THRESHOLD)) {
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		return;
	}

	srv_conc_enter_innodb(trx);
}

/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_exit_innodb(
/*========================*/
	trx_t*	trx)	/* in: transaction handle */
{
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	if (UNIV_LIKELY(srv_thread_concurrency >= SRV_CONCURRENCY_THRESHOLD)) {
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		return;
	}

	srv_conc_exit_innodb(trx);
}

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/**********************************************************************
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Releases possible search latch and InnoDB thread FIFO ticket. These should
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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. */
inline
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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);
	}
}

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/************************************************************************
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. */

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int
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innobase_release_temporary_latches(
/*===============================*/
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        THD *thd)
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{
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	trx_t*	trx;

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	if (!innodb_inited) {
		
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		return 0;
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	}

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	trx = (trx_t*) thd->ha_data[innobase_hton.slot];

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

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/************************************************************************
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. */
inline
void
innobase_active_small(void)
/*=======================*/
{
	innobase_active_counter++;

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

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/************************************************************************
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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. */
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static
int
convert_error_code_to_mysql(
/*========================*/
			/* out: MySQL error code */
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	int	error,	/* in: InnoDB error code */
	THD*	thd)	/* in: user thread handle or NULL */
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{
	if (error == DB_SUCCESS) {

		return(0);

  	} else if (error == (int) DB_DUPLICATE_KEY) {

    		return(HA_ERR_FOUND_DUPP_KEY);

 	} else if (error == (int) DB_RECORD_NOT_FOUND) {

    		return(HA_ERR_NO_ACTIVE_RECORD);

 	} else if (error == (int) DB_ERROR) {

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    		return(-1); /* unspecified error */
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 	} else if (error == (int) DB_DEADLOCK) {
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 		/* Since we rolled back the whole transaction, we must
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 		tell it also to MySQL so that MySQL knows to empty the
 		cached binlog for this transaction */

 		if (thd) {
 			ha_rollback(thd);
 		}
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    		return(HA_ERR_LOCK_DEADLOCK);

 	} else if (error == (int) DB_LOCK_WAIT_TIMEOUT) {

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		/* 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. */
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   		return(HA_ERR_LOCK_WAIT_TIMEOUT);
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 	} else if (error == (int) DB_NO_REFERENCED_ROW) {

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    		return(HA_ERR_NO_REFERENCED_ROW);
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 	} else if (error == (int) DB_ROW_IS_REFERENCED) {

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    		return(HA_ERR_ROW_IS_REFERENCED);
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        } else if (error == (int) DB_CANNOT_ADD_CONSTRAINT) {
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    		return(HA_ERR_CANNOT_ADD_FOREIGN);
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        } else if (error == (int) DB_CANNOT_DROP_CONSTRAINT) {

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    		return(HA_ERR_ROW_IS_REFERENCED); /* TODO: This is a bit
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						misleading, a new MySQL error
						code should be introduced */
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        } else if (error == (int) DB_COL_APPEARS_TWICE_IN_INDEX) {

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    		return(HA_ERR_CRASHED);
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 	} else if (error == (int) DB_OUT_OF_FILE_SPACE) {

    		return(HA_ERR_RECORD_FILE_FULL);

 	} else if (error == (int) DB_TABLE_IS_BEING_USED) {

    		return(HA_ERR_WRONG_COMMAND);

 	} else if (error == (int) DB_TABLE_NOT_FOUND) {

    		return(HA_ERR_KEY_NOT_FOUND);

  	} else if (error == (int) DB_TOO_BIG_RECORD) {

    		return(HA_ERR_TO_BIG_ROW);
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  	} else if (error == (int) DB_CORRUPTION) {

    		return(HA_ERR_CRASHED);
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  	} else if (error == (int) DB_NO_SAVEPOINT) {

    		return(HA_ERR_NO_SAVEPOINT);
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  	} else if (error == (int) DB_LOCK_TABLE_FULL) {

    		return(HA_ERR_LOCK_TABLE_FULL);
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    	} else {
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    		return(-1);			// Unknown error
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    	}
}

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/*****************************************************************
If you want to print a thd that is not associated with the current thread,
you must call this function before reserving the InnoDB kernel_mutex, to
protect MySQL from setting thd->query NULL. If you print a thd of the current
thread, we know that MySQL cannot modify thd->query, and it is not necessary
to call this. Call innobase_mysql_end_print_arbitrary_thd() after you release
the kernel_mutex.
NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_prepare_print_arbitrary_thd(void)
/*============================================*/
{
	VOID(pthread_mutex_lock(&LOCK_thread_count));
}

/*****************************************************************
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Releases the mutex reserved by innobase_mysql_prepare_print_arbitrary_thd().
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NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_end_print_arbitrary_thd(void)
/*========================================*/
{
	VOID(pthread_mutex_unlock(&LOCK_thread_count));
}

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/*****************************************************************
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Prints info of a THD object (== user session thread) to the given file.
NOTE that /mysql/innobase/trx/trx0trx.c must contain the prototype for
this function! */
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extern "C"
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void
innobase_mysql_print_thd(
/*=====================*/
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	FILE*   f,		/* in: output stream */
	void*   input_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 */
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{
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	const THD*	thd;
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        const Security_context *sctx;
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	const char*	s;
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        thd = (const THD*) input_thd;
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        /* We probably want to have original user as part of debug output. */
        sctx = &thd->main_security_ctx;

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  	fprintf(f, "MySQL thread id %lu, query id %lu",
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		thd->thread_id, (ulong) thd->query_id);
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	if (sctx->host) {
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		putc(' ', f);
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		fputs(sctx->host, f);
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	}
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	if (sctx->ip) {
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		putc(' ', f);
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		fputs(sctx->ip, f);
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	}
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        if (sctx->user) {
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		putc(' ', f);
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		fputs(sctx->user, f);
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  	}

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	if ((s = thd->proc_info)) {
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		putc(' ', f);
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		fputs(s, f);
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	}
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	if ((s = thd->query)) {
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		/* 3100 is chosen because currently 3000 is the maximum
		   max_query_len we ever give this. */
		char	buf[3100];
		uint	len;

		/* If buf is too small, we dynamically allocate storage
		   in this. */
		char*	dyn_str = NULL;

		/* Points to buf or dyn_str. */
		char*	str = buf;
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		if (max_query_len == 0)
		{
			/* ADDITIONAL SAFETY: the default is to print at
			   most 300 chars to reduce the probability of a
			   seg fault if there is a race in
			   thd->query_length in MySQL; after May 14, 2004
			   probably no race any more, but better be
			   safe */
			max_query_len = 300;
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		}
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		len = min(thd->query_length, max_query_len);
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		if (len > (sizeof(buf) - 1))
		{
			dyn_str = my_malloc(len + 1, MYF(0));
			str = dyn_str;
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		}
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                /* Use strmake to reduce the timeframe for a race,
                   compared to fwrite() */
		len = (uint) (strmake(str, s, len) - str);
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		putc('\n', f);
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		fwrite(str, 1, len, f);

		if (dyn_str)
		{
			my_free(dyn_str, MYF(0));
		}
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	}
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	putc('\n', f);
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}

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/**********************************************************************
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Get the variable length bounds of the given character set.
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NOTE that the exact prototype of this function has to be in
/innobase/data/data0type.ic! */
extern "C"
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void
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innobase_get_cset_width(
/*====================*/
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	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) */
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{
	CHARSET_INFO*	cs;
	ut_ad(cset < 256);
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	ut_ad(mbminlen);
	ut_ad(mbmaxlen);
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	cs = all_charsets[cset];
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	if (cs) {
		*mbminlen = cs->mbminlen;
		*mbmaxlen = cs->mbmaxlen;
	} else {
		ut_a(cset == 0);
		*mbminlen = *mbmaxlen = 0;
	}
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}

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/**********************************************************************
Compares NUL-terminated UTF-8 strings case insensitively.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
int
innobase_strcasecmp(
/*================*/
				/* out: 0 if a=b, <0 if a<b, >1 if a>b */
	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.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
void
innobase_casedn_str(
/*================*/
	char*	a)	/* in/out: string to put in lower case */
{
	my_casedn_str(system_charset_info, a);
}

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/*************************************************************************
Creates a temporary file. */
extern "C"
int
innobase_mysql_tmpfile(void)
/*========================*/
			/* out: temporary file descriptor, or < 0 on error */
{
	char	filename[FN_REFLEN];
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	int	fd2 = -1;
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	File	fd = create_temp_file(filename, mysql_tmpdir, "ib",
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#ifdef __WIN__
				O_BINARY | O_TRUNC | O_SEQUENTIAL |
				O_TEMPORARY | O_SHORT_LIVED |
#endif /* __WIN__ */
				O_CREAT | O_EXCL | O_RDWR,
				MYF(MY_WME));
	if (fd >= 0) {
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#ifndef __WIN__
		/* On Windows, open files cannot be removed, but files can be
		created with the O_TEMPORARY flag to the same effect
		("delete on close"). */
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		unlink(filename);
#endif /* !__WIN__ */
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		/* 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;
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                        my_error(EE_OUT_OF_FILERESOURCES,
                                 MYF(ME_BELL+ME_WAITTANG),
                                 filename, my_errno);
                }
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		my_close(fd, MYF(MY_WME));
	}
	return(fd2);
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}

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

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	ut_ad(thd == current_thd);
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        trx = (trx_t*) thd->ha_data[innobase_hton.slot];
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	if (trx == NULL) {
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	        DBUG_ASSERT(thd != NULL);
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		trx = trx_allocate_for_mysql();
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		trx->mysql_thd = thd;
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		trx->mysql_query_str = &(thd->query);
                trx->active_trans = 0;
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		/* Update the info whether we should skip XA steps that eat
		CPU time */
		trx->support_xa = (ibool)(thd->variables.innodb_support_xa);

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                thd->ha_data[innobase_hton.slot] = trx;
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	} else {
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		if (trx->magic_n != TRX_MAGIC_N) {
			mem_analyze_corruption((byte*)trx);

			ut_a(0);
		}
	}

	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	} else {
		trx->check_foreigns = TRUE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	} else {
		trx->check_unique_secondary = TRUE;
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	}

	return(trx);
}

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/*************************************************************************
Construct ha_innobase handler. */

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ha_innobase::ha_innobase(TABLE_SHARE *table_arg)
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  :handler(&innobase_hton, table_arg),
  int_table_flags(HA_REC_NOT_IN_SEQ |
                  HA_NULL_IN_KEY |
                  HA_CAN_INDEX_BLOBS |
                  HA_CAN_SQL_HANDLER |
                  HA_NOT_EXACT_COUNT |
                  HA_PRIMARY_KEY_IN_READ_INDEX |
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                  HA_CAN_GEOMETRY |
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                  HA_TABLE_SCAN_ON_INDEX),
  last_dup_key((uint) -1),
  start_of_scan(0),
  num_write_row(0)
{}

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/*************************************************************************
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Updates the user_thd field in a handle and also allocates a new InnoDB
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transaction handle if needed, and updates the transaction fields in the
prebuilt struct. */
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inline
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int
ha_innobase::update_thd(
/*====================*/
			/* out: 0 or error code */
	THD*	thd)	/* in: thd to use the handle */
{
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;
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	trx = check_trx_exists(thd);

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	if (prebuilt->trx != trx) {
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		row_update_prebuilt_trx(prebuilt, trx);
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	}

	user_thd = thd;
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	return(0);
}

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/*************************************************************************
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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. */
inline
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void
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innobase_register_stmt(
/*===================*/
	THD*	thd)	/* in: MySQL thd (connection) object */
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{
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        /* Register the statement */
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        trans_register_ha(thd, FALSE, &innobase_hton);
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}

/*************************************************************************
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. */
inline
void
innobase_register_trx_and_stmt(
/*===========================*/
	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(thd);
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        if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

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              /* No autocommit mode, register for a transaction */
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              trans_register_ha(thd, TRUE, &innobase_hton);
        }
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}
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/*   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
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id <= INV_TRX_ID to use the query cache.
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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
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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. */
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my_bool
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innobase_query_caching_of_table_permitted(
/*======================================*/
				/* out: TRUE if permitted, FALSE if not;
				note that the value FALSE does not mean
				we should invalidate the query cache:
				invalidation is called explicitly */
	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 '\0', and the table
				name */
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	uint	full_name_len,	/* in: length of the full name, i.e.
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				len(dbname) + len(tablename) + 1 */
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        ulonglong *unused)      /* unused for this engine */
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{
	ibool	is_autocommit;
	trx_t*	trx;
	char	norm_name[1000];

	ut_a(full_name_len < 999);

	if (thd->variables.tx_isolation == ISO_SERIALIZABLE) {
		/* In the SERIALIZABLE mode we add LOCK IN SHARE MODE to every
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		plain SELECT if AUTOCOMMIT is not on. */
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		return((my_bool)FALSE);
	}

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

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	innobase_release_stat_resources(trx);

	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		is_autocommit = TRUE;
	} else {
		is_autocommit = FALSE;

	}

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	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. */
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		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__
1050
	innobase_casedn_str(norm_name);
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#endif
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	/* The call of row_search_.. will start a new transaction if it is
	not yet started */

1055 1056
        if (trx->active_trans == 0) {

1057
                innobase_register_trx_and_stmt(thd);
1058 1059
                trx->active_trans = 1;
        }
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	if (row_search_check_if_query_cache_permitted(trx, norm_name)) {

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

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

/*********************************************************************
Invalidates the MySQL query cache for the table.
NOTE that the exact prototype of this function has to be in
/innobase/row/row0ins.c! */
1077
extern "C"
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void
innobase_invalidate_query_cache(
/*============================*/
	trx_t*	trx,		/* in: transaction which modifies the table */
	char*	full_name,	/* in: concatenation of database name, null
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				char '\0', table name, null char'\0';
				NOTE that in Windows this is always
				in LOWER CASE! */
	ulint	full_name_len)	/* in: full name length where also the null
				chars count */
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{
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	/* 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. */

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	/* Argument TRUE below means we are using transactions */
1094
#ifdef HAVE_QUERY_CACHE
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	query_cache.invalidate((THD*)(trx->mysql_thd),
					(const char*)full_name,
					(uint32)full_name_len,
					TRUE);
1099
#endif
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}
1101 1102

/*********************************************************************
1103 1104
Get the quote character to be used in SQL identifiers.
This definition must match the one in innobase/ut/ut0ut.c! */
1105
extern "C"
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int
mysql_get_identifier_quote_char(
/*============================*/
1109
				/* out: quote character to be
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				used in SQL identifiers; EOF if none */
	trx_t*		trx,	/* in: transaction */
	const char*	name,	/* in: name to print */
	ulint		namelen)/* in: length of name */
{
	if (!trx || !trx->mysql_thd) {
		return(EOF);
	}
	return(get_quote_char_for_identifier((THD*) trx->mysql_thd,
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						name, (int) namelen));
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}

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

1134 1135 1136 1137 1138 1139 1140 1141
/**************************************************************************
Obtain a pointer to the MySQL THD object, as in current_thd().  This
definition must match the one in sql/ha_innodb.cc! */
extern "C"
void*
innobase_current_thd(void)
/*======================*/
			/* out: MySQL THD object */
1142
{
1143
	return(current_thd);
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}

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/*********************************************************************
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,
1150
fetch next etc. This function inits the necessary things even after a
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transaction commit. */

void
ha_innobase::init_table_handle_for_HANDLER(void)
/*============================================*/
{
        row_prebuilt_t* prebuilt;

        /* 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(current_thd);

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

        prebuilt = (row_prebuilt_t*)innobase_prebuilt;

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	innobase_release_stat_resources(prebuilt->trx);

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

        trx_start_if_not_started_noninline(prebuilt->trx);

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

        trx_assign_read_view(prebuilt->trx);

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

1183 1184
        if (prebuilt->trx->active_trans == 0) {

1185
                innobase_register_trx_and_stmt(current_thd);
1186 1187 1188

                prebuilt->trx->active_trans = 1;
        }
1189

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        /* 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;
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        prebuilt->stored_select_lock_type = LOCK_NONE;
1200 1201 1202

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

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        prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
1204 1205 1206 1207 1208

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

        prebuilt->read_just_key = FALSE;
1209 1210

	prebuilt->used_in_HANDLER = TRUE;
1211 1212

	prebuilt->keep_other_fields_on_keyread = FALSE;
1213 1214
}

1215
/*************************************************************************
1216
Opens an InnoDB database. */
1217

1218
bool
1219 1220
innobase_init(void)
/*===============*/
1221
			/* out: &innobase_hton, or NULL on error */
1222
{
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1223
	static char	current_dir[3];		/* Set if using current lib */
1224 1225
	int		err;
	bool		ret;
1226
	char 	        *default_path;
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1228 1229
  	DBUG_ENTER("innobase_init");

1230 1231 1232
         if (have_innodb != SHOW_OPTION_YES)
           goto error;

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	ut_a(DATA_MYSQL_TRUE_VARCHAR == (ulint)MYSQL_TYPE_VARCHAR);

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	/* 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");

			DBUG_RETURN(0);
		}

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

			DBUG_RETURN(0);
		}
	}

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  	os_innodb_umask = (ulint)my_umask;
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	/* 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. */

1262
	if (mysqld_embedded) {
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		default_path = mysql_real_data_home;
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		fil_path_to_mysql_datadir = mysql_real_data_home;
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	} 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;
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	}

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	ut_a(default_path);

1275 1276 1277 1278 1279 1280
	if (specialflag & SPECIAL_NO_PRIOR) {
	        srv_set_thread_priorities = FALSE;
	} else {
	        srv_set_thread_priorities = TRUE;
	        srv_query_thread_priority = QUERY_PRIOR;
	}
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	/* Set InnoDB initialization parameters according to the values
	read from MySQL .cnf file */
1284

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	/*--------------- Data files -------------------------*/
1286

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	/* The default dir for data files is the datadir of MySQL */
1288 1289

	srv_data_home = (innobase_data_home_dir ? innobase_data_home_dir :
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			 default_path);
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	/* 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,
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1304
						   MYF(MY_FAE));
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	ret = (bool) srv_parse_data_file_paths_and_sizes(
				internal_innobase_data_file_path,
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				&srv_data_file_names,
				&srv_data_file_sizes,
				&srv_data_file_is_raw_partition,
				&srv_n_data_files,
				&srv_auto_extend_last_data_file,
				&srv_last_file_size_max);
1314
	if (ret == FALSE) {
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	  	sql_print_error(
			"InnoDB: syntax error in innodb_data_file_path");
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	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
1319
                goto error;
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	}
1321

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	/* -------------- 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;
	}
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#ifdef UNIV_LOG_ARCHIVE	  	
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	/* 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;
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#endif /* UNIG_LOG_ARCHIVE */
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	ret = (bool)
		srv_parse_log_group_home_dirs(innobase_log_group_home_dir,
						&srv_log_group_home_dirs);
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	if (ret == FALSE || innobase_mirrored_log_groups != 1) {
1345 1346
	  sql_print_error("syntax error in innodb_log_group_home_dir, or a "
			  "wrong number of mirrored log groups");
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	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
1350
                goto error;
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	}
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	/* --------------------------------------------------*/

	srv_file_flush_method_str = innobase_unix_file_flush_method;
1356

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	srv_n_log_groups = (ulint) innobase_mirrored_log_groups;
1358
	srv_n_log_files = (ulint) innobase_log_files_in_group;
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	srv_log_file_size = (ulint) innobase_log_file_size;

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#ifdef UNIV_LOG_ARCHIVE
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	srv_log_archive_on = (ulint) innobase_log_archive;
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#endif /* UNIV_LOG_ARCHIVE */
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	srv_log_buffer_size = (ulint) innobase_log_buffer_size;
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	srv_flush_log_at_trx_commit = (ulint) innobase_flush_log_at_trx_commit;
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        /* We set srv_pool_size here in units of 1 kB. InnoDB internally
        changes the value so that it becomes the number of database pages. */
1369 1370

        if (innobase_buffer_pool_awe_mem_mb == 0) {
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                /* Careful here: we first convert the signed long int to ulint
                and only after that divide */
 
                srv_pool_size = ((ulint) innobase_buffer_pool_size) / 1024;
        } else {
                srv_use_awe = TRUE;
                srv_pool_size = (ulint)
                                (1024 * innobase_buffer_pool_awe_mem_mb);
                srv_awe_window_size = (ulint) innobase_buffer_pool_size;
 
                /* Note that what the user specified as
                innodb_buffer_pool_size is actually the AWE memory window
                size in this case, and the real buffer pool size is
                determined by .._awe_mem_mb. */
        }
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	srv_mem_pool_size = (ulint) innobase_additional_mem_pool_size;

	srv_n_file_io_threads = (ulint) innobase_file_io_threads;
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1391
	srv_lock_wait_timeout = (ulint) innobase_lock_wait_timeout;
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	srv_force_recovery = (ulint) innobase_force_recovery;

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	srv_use_doublewrite_buf = (ibool) innobase_use_doublewrite;
	srv_use_checksums = (ibool) innobase_use_checksums;
1396

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	os_use_large_pages = (ibool) innobase_use_large_pages;
	os_large_page_size = (ulint) innobase_large_page_size;
1399
  
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	srv_file_per_table = (ibool) innobase_file_per_table;
1401
        srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;
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	srv_max_n_open_files = (ulint) innobase_open_files;
1404
	srv_innodb_status = (ibool) innobase_create_status_file;
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	srv_print_verbose_log = mysqld_embedded ? 0 : 1;
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	/* Store the default charset-collation number of this MySQL
1409
	installation */
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	data_mysql_default_charset_coll = (ulint)default_charset_info->number;
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1413 1414
	ut_a(DATA_MYSQL_LATIN1_SWEDISH_CHARSET_COLL ==
					my_charset_latin1.number);
1415

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	/* 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. */
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1421
	ut_a(0 == strcmp((char*)my_charset_latin1.name,
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1422 1423
						(char*)"latin1_swedish_ci"));
	memcpy(srv_latin1_ordering, my_charset_latin1.sort_order, 256);
1424

1425 1426 1427 1428 1429 1430 1431 1432
	/* 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. */

	srv_sizeof_trx_t_in_ha_innodb_cc = sizeof(trx_t);

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	err = innobase_start_or_create_for_mysql();
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	if (err != DB_SUCCESS) {
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	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
1438
                goto error;
1439
	}
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	(void) hash_init(&innobase_open_tables,system_charset_info, 32, 0, 0,
			 		(hash_get_key) innobase_get_key, 0, 0);
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        pthread_mutex_init(&innobase_share_mutex, MY_MUTEX_INIT_FAST);
        pthread_mutex_init(&prepare_commit_mutex, MY_MUTEX_INIT_FAST);
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        pthread_mutex_init(&commit_threads_m, MY_MUTEX_INIT_FAST);
        pthread_mutex_init(&commit_cond_m, MY_MUTEX_INIT_FAST);
        pthread_cond_init(&commit_cond, NULL);
1448
	innodb_inited= 1;
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	/* If this is a replication slave and we needed to do a crash recovery,
	set the master binlog position to what InnoDB internally knew about
	how far we got transactions durable inside InnoDB. There is a
	problem here: if the user used also MyISAM tables, InnoDB might not
	know the right position for them.

	THIS DOES NOT WORK CURRENTLY because replication seems to initialize
	glob_mi also after innobase_init. */
	
/*	if (trx_sys_mysql_master_log_pos != -1) {
		ut_memcpy(glob_mi.log_file_name, trx_sys_mysql_master_log_name,
				1 + ut_strlen(trx_sys_mysql_master_log_name));
		glob_mi.pos = trx_sys_mysql_master_log_pos;
	}
*/
1465 1466 1467 1468
	DBUG_RETURN(FALSE);
error:
        have_innodb= SHOW_OPTION_DISABLED;	// If we couldn't use handler
        DBUG_RETURN(TRUE);
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}

/***********************************************************************
1472
Closes an InnoDB database. */
1473

1474 1475
int
innobase_end(ha_panic_function type)
1476
/*==============*/
1477
				/* out: TRUE if error */
1478
{
1479
	int	err= 0;
1480 1481 1482

	DBUG_ENTER("innobase_end");

1483 1484 1485 1486 1487
#ifdef __NETWARE__ 	/* some special cleanup for NetWare */
	if (nw_panic) {
		set_panic_flag_for_netware();
	}
#endif
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	if (innodb_inited) {
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	        srv_fast_shutdown = (ulint) innobase_fast_shutdown;
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	  	innodb_inited = 0;
	  	if (innobase_shutdown_for_mysql() != DB_SUCCESS) {
	    		err = 1;
		}
	  	hash_free(&innobase_open_tables);
	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
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                pthread_mutex_destroy(&innobase_share_mutex);
                pthread_mutex_destroy(&prepare_commit_mutex);
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                pthread_mutex_destroy(&commit_threads_m);
                pthread_mutex_destroy(&commit_cond_m);
                pthread_cond_destroy(&commit_cond);
1503
	}
1504

1505
  	DBUG_RETURN(err);
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}

/********************************************************************
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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. */
1511

1512
bool
1513 1514
innobase_flush_logs(void)
/*=====================*/
1515
				/* out: TRUE if error */
1516
{
1517
  	bool 	result = 0;
1518 1519 1520

  	DBUG_ENTER("innobase_flush_logs");

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	log_buffer_flush_to_disk();
1522

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  	DBUG_RETURN(result);
}

/*********************************************************************
1527
Commits a transaction in an InnoDB database. */
1528

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void
innobase_commit_low(
/*================*/
	trx_t*	trx)	/* in: transaction handle */
{
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        if (trx->conc_state == TRX_NOT_STARTED) {
1535

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                return;
        }
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#ifdef HAVE_REPLICATION
        THD *thd=current_thd;

        if (thd && thd->slave_thread) {
1543
                /* Update the replication position info inside InnoDB */
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1545
                trx->mysql_master_log_file_name
1546
                                        = active_mi->rli.group_master_log_name;
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                trx->mysql_master_log_pos = ((ib_longlong)
                                active_mi->rli.future_group_master_log_pos);
1549
        }
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SCRUM  
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#endif /* HAVE_REPLICATION */
1551

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	trx_commit_for_mysql(trx);
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}

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/*********************************************************************
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. */

int
innobase_start_trx_and_assign_read_view(
/*====================================*/
			/* out: 0 */
	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");

	/* 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_noninline(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 */

1592 1593
        if (trx->active_trans == 0) {

1594
                innobase_register_trx_and_stmt(current_thd);
1595 1596 1597

                trx->active_trans = 1;
        }
1598 1599 1600 1601

	DBUG_RETURN(0);
}

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/*********************************************************************
1603 1604
Commits a transaction in an InnoDB database or marks an SQL statement
ended. */
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static
int
1607 1608
innobase_commit(
/*============*/
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			/* out: 0 */
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	THD*	thd,	/* in: MySQL thread handle of the user for whom
1611
			the transaction should be committed */
1612 1613
        bool    all)    /* in: TRUE - commit transaction
                               FALSE - the current SQL statement ended */
1614
{
1615
	trx_t*		trx;
1616 1617 1618 1619

  	DBUG_ENTER("innobase_commit");
  	DBUG_PRINT("trans", ("ending transaction"));

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	trx = check_trx_exists(thd);
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	/* Update the info whether we should skip XA steps that eat CPU time */
	trx->support_xa = (ibool)(thd->variables.innodb_support_xa);

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	/* 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. */
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        if (trx->has_search_latch) {
                          trx_search_latch_release_if_reserved(trx);
        }
        
1633
        /* The flag trx->active_trans is set to 1 in
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	1. ::external_lock(),
	2. ::start_stmt(),
1637
	3. innobase_query_caching_of_table_permitted(),
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	4. innobase_savepoint(),
1639
	5. ::init_table_handle_for_HANDLER(),
1640 1641
	6. innobase_start_trx_and_assign_read_view(),
	7. ::transactional_table_lock()
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	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. */
1647

1648
        if (trx->active_trans == 0
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	    && trx->conc_state != TRX_NOT_STARTED) {
	    
1651 1652
	  sql_print_error("trx->active_trans == 0, but trx->conc_state != "
			  "TRX_NOT_STARTED");
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	}
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        if (all
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
1656
	        
1657
 		/* We were instructed to commit the whole transaction, or
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		this is an SQL statement end and autocommit is on */

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                /* We need current binlog position for ibbackup to work.
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1661
                Note, the position is current because of prepare_commit_mutex */
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retry:
                if (srv_commit_concurrency > 0)
                {
                  pthread_mutex_lock(&commit_cond_m);
                  commit_threads++;
                  if (commit_threads > srv_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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                trx->mysql_log_file_name = mysql_bin_log.get_log_fname();
                trx->mysql_log_offset =
                        (ib_longlong)mysql_bin_log.get_log_file()->pos_in_file;

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		innobase_commit_low(trx);
1683

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                if (srv_commit_concurrency > 0)
                {
                  pthread_mutex_lock(&commit_cond_m);
                  commit_threads--;
                  pthread_cond_signal(&commit_cond);
                  pthread_mutex_unlock(&commit_cond_m);
                }
                
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                if (trx->active_trans == 2) {

                        pthread_mutex_unlock(&prepare_commit_mutex);
                }
1696
               
1697
                trx->active_trans = 0;
1698
               
1699
	} else {
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	        /* We just mark the SQL statement ended and do not do a
		transaction commit */

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		if (trx->auto_inc_lock) {
			/* 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);
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	}
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	/* Tell the InnoDB server that there might be work for utility
	threads: */
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        if (trx->declared_to_be_inside_innodb) {
                          /* Release our possible ticket in the FIFO */
1720

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                          srv_conc_force_exit_innodb(trx);
        }
1723 1724
	srv_active_wake_master_thread();

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	DBUG_RETURN(0);
1726 1727
}

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/* TODO: put the
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MySQL-4.1 functionality back to 5.0. This is needed to get InnoDB Hot Backup
to work. */
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/*********************************************************************
This is called when MySQL writes the binlog entry for the current
transaction. Writes to the InnoDB tablespace info which tells where the
MySQL binlog entry for the current transaction ended. Also commits the
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transaction inside InnoDB but does NOT flush InnoDB log files to disk.
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To flush you have to call innobase_commit_complete(). We have separated
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flushing to eliminate the bottleneck of LOCK_log in log.cc which disabled
InnoDB's group commit capability. */
1740 1741 1742 1743

int
innobase_report_binlog_offset_and_commit(
/*=====================================*/
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                                /* out: 0 */
1745
        THD*    thd,            /* in: user thread */
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        void*   trx_handle,     /* in: InnoDB trx handle */
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        char*   log_file_name,  /* in: latest binlog file name */
        my_off_t end_offset)    /* in: the offset in the binlog file
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                                   up to which we wrote */
1750
{
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	trx_t*	trx;

	trx = (trx_t*)trx_handle;
1754

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	ut_a(trx != NULL);

1757
	trx->mysql_log_file_name = log_file_name;
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	trx->mysql_log_offset = (ib_longlong)end_offset;
1759

1760
#ifdef HAVE_REPLICATION
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        if (thd->variables.sync_replication) {
                /* Let us store the binlog file name and the position, so that
                we know how long to wait for the binlog to the replicated to
                the slave in synchronous replication. */

                if (trx->repl_wait_binlog_name == NULL) {

                        trx->repl_wait_binlog_name =
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                                  (char*)mem_alloc_noninline(FN_REFLEN + 100);
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                }

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                ut_a(strlen(log_file_name) < FN_REFLEN + 100);
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                strcpy(trx->repl_wait_binlog_name, log_file_name);

                trx->repl_wait_binlog_pos = (ib_longlong)end_offset;
        }
1778
#endif /* HAVE_REPLICATION */
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	trx->flush_log_later = TRUE;

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	innobase_commit(thd, TRUE);
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	trx->flush_log_later = FALSE;

	return(0);
}

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#if 0
1789 1790 1791
/***********************************************************************
This function stores the binlog offset and flushes logs. */

1792
void
1793 1794 1795
innobase_store_binlog_offset_and_flush_log(
/*=======================================*/
    char *binlog_name,          /* in: binlog name */
1796
    longlong	offset)		/* in: binlog offset */
1797 1798
{
	mtr_t mtr;
1799

1800 1801 1802
	assert(binlog_name != NULL);

	/* Start a mini-transaction */
1803
        mtr_start_noninline(&mtr);
1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814

	/* Update the latest MySQL binlog name and offset info
        in trx sys header */

        trx_sys_update_mysql_binlog_offset(
            binlog_name,
            offset,
            TRX_SYS_MYSQL_LOG_INFO, &mtr);

        /* Commits the mini-transaction */
        mtr_commit(&mtr);
1815

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	/* Synchronous flush of the log buffer to disk */
1817 1818 1819 1820
	log_buffer_flush_to_disk();
}
#endif

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/*********************************************************************
This is called after MySQL has written the binlog entry for the current
transaction. Flushes the InnoDB log files to disk if required. */

int
innobase_commit_complete(
/*=====================*/
                                /* out: 0 */
1829
        THD*    thd)            /* in: user thread */
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{
	trx_t*	trx;

1833
        trx = (trx_t*) thd->ha_data[innobase_hton.slot];
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1835
        if (trx && trx->active_trans) {
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                trx->active_trans = 0;
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1839
                if (srv_flush_log_at_trx_commit == 0) {
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                        return(0);
                }
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1844
                trx_commit_complete_for_mysql(trx);
1845
        }
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1847
#ifdef HAVE_REPLICATION
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        if (thd->variables.sync_replication
            && trx->repl_wait_binlog_name
            && innobase_repl_state != 0) {

1852 1853 1854 1855
		struct timespec abstime;
		int	cmp;
		int	ret;

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                /* In synchronous replication, let us wait until the MySQL
                replication has sent the relevant binlog segment to the
                replication slave. */

                pthread_mutex_lock(&innobase_repl_cond_mutex);
try_again:
                if (innobase_repl_state == 0) {

                        pthread_mutex_unlock(&innobase_repl_cond_mutex);

                        return(0);
                }

                cmp = strcmp(innobase_repl_file_name,
                                        trx->repl_wait_binlog_name);
                if (cmp > 0
                    || (cmp == 0 && innobase_repl_pos
                                    >= (my_off_t)trx->repl_wait_binlog_pos)) {
                        /* We have already sent the relevant binlog to the
                        slave: no need to wait here */

                        pthread_mutex_unlock(&innobase_repl_cond_mutex);

/*                      printf("Binlog now sent\n"); */

                        return(0);
                }

                /* Let us update the info about the minimum binlog position
                of waiting threads in the innobase_repl_... variables */

                if (innobase_repl_wait_file_name_inited != 0) {
                        cmp = strcmp(trx->repl_wait_binlog_name,
                                        innobase_repl_wait_file_name);
                        if (cmp < 0
                            || (cmp == 0 && (my_off_t)trx->repl_wait_binlog_pos
                                         <= innobase_repl_wait_pos)) {
                                /* This thd has an even lower position, let
                                us update the minimum info */

                                strcpy(innobase_repl_wait_file_name,
                                        trx->repl_wait_binlog_name);

                                innobase_repl_wait_pos =
                                        trx->repl_wait_binlog_pos;
                        }
                } else {
                        strcpy(innobase_repl_wait_file_name,
                                                trx->repl_wait_binlog_name);

                        innobase_repl_wait_pos = trx->repl_wait_binlog_pos;

                        innobase_repl_wait_file_name_inited = 1;
                }
                set_timespec(abstime, thd->variables.sync_replication_timeout);

                /* Let us suspend this thread to wait on the condition;
                when replication has progressed far enough, we will release
                these waiting threads. The following call
                pthread_cond_timedwait also atomically unlocks
                innobase_repl_cond_mutex. */

                innobase_repl_n_wait_threads++;

/*              printf("Waiting for binlog to be sent\n"); */

                ret = pthread_cond_timedwait(&innobase_repl_cond,
                                        &innobase_repl_cond_mutex, &abstime);
                innobase_repl_n_wait_threads--;

                if (ret != 0) {
                        ut_print_timestamp(stderr);

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			sql_print_error("MySQL synchronous replication was "
					"not able to send the binlog to the "
					"slave within the timeout %lu. We "
					"assume that the slave has become "
					"inaccessible, and switch off "
					"synchronous replication until the "
					"communication to the slave works "
					"again. MySQL synchronous replication "
					"has sent binlog to the slave up to "
					"file %s, position %lu. This "
					"transaction needs it to be sent up "
					"to file %s, position %lu.",
					thd->variables.sync_replication_timeout,
					innobase_repl_file_name,
					(ulong) innobase_repl_pos,
					trx->repl_wait_binlog_name,
					(ulong) trx->repl_wait_binlog_pos);
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                        innobase_repl_state = 0;

                        pthread_mutex_unlock(&innobase_repl_cond_mutex);

                        return(0);
                }

                goto try_again;
        }
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#endif // HAVE_REPLICATION
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	return(0);
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}

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#ifdef HAVE_REPLICATION
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/*********************************************************************
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In synchronous replication, reports to InnoDB up to which binlog position
we have sent the binlog to the slave. Note that replication is synchronous
for one slave only. For other slaves, we do nothing in this function. This
function is used in a replication master. */

int
innobase_repl_report_sent_binlog(
/*=============================*/
                                /* out: 0 */
        THD*    thd,            /* in: thread doing the binlog communication to
                                the slave */
        char*   log_file_name,  /* in: binlog file name */
        my_off_t end_offset)    /* in: the offset in the binlog file up to
                                which we sent the contents to the slave */
{
        int     cmp;
        ibool   can_release_threads     = 0;

        /* If synchronous replication is not switched on, or this thd is
        sending binlog to a slave where we do not need synchronous replication,
        then return immediately */

        if (thd->server_id != thd->variables.sync_replication_slave_id) {

                /* Do nothing */

                return(0);
        }

        pthread_mutex_lock(&innobase_repl_cond_mutex);

        if (innobase_repl_state == 0) {

                ut_print_timestamp(stderr);
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		sql_print_warning("Switching MySQL synchronous replication on "
				  "again at binlog file %s, position %lu",
				  log_file_name, (ulong) end_offset);
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                innobase_repl_state = 1;
        }

        /* The position should increase monotonically, since just one thread
        is sending the binlog to the slave for which we want synchronous
        replication. Let us check this, and print an error to the .err log
        if that is not the case. */

        if (innobase_repl_file_name_inited) {
                cmp = strcmp(log_file_name, innobase_repl_file_name);

                if (cmp < 0
                    || (cmp == 0 && end_offset < innobase_repl_pos)) {

                        ut_print_timestamp(stderr);
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			sql_print_error("MySQL synchronous replication has "
					"sent binlog to the slave up to file "
					"%s, position %lu, but now MySQL "
					"reports that it sent the binlog only "
					"up to file %s, position %lu",
					innobase_repl_file_name,
					(ulong) innobase_repl_pos,
					log_file_name, (ulong) end_offset);
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                }
        }

        strcpy(innobase_repl_file_name, log_file_name);
        innobase_repl_pos = end_offset;
        innobase_repl_file_name_inited = 1;

        if (innobase_repl_n_wait_threads > 0) {
                /* Let us check if some of the waiting threads doing a trx
                commit can now proceed */

                cmp = strcmp(innobase_repl_file_name,
                                        innobase_repl_wait_file_name);
                if (cmp > 0
                    || (cmp == 0 && innobase_repl_pos
                                    >= innobase_repl_wait_pos)) {

                        /* Yes, at least one waiting thread can now proceed:
                        let us release all waiting threads with a broadcast */

                        can_release_threads = 1;

                        innobase_repl_wait_file_name_inited = 0;
                }
        }

        pthread_mutex_unlock(&innobase_repl_cond_mutex);

        if (can_release_threads) {

                pthread_cond_broadcast(&innobase_repl_cond);
        }
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	return(0);
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}
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#endif /* HAVE_REPLICATION */
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/*********************************************************************
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Rolls back a transaction or the latest SQL statement. */
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static int
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innobase_rollback(
/*==============*/
			/* out: 0 or error number */
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	THD*	thd,	/* in: handle to the MySQL thread of the user
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			whose transaction should be rolled back */
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        bool    all)    /* in: TRUE - commit transaction
                               FALSE - the current SQL statement ended */
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{
	int	error = 0;
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	trx_t*	trx;
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	DBUG_ENTER("innobase_rollback");
	DBUG_PRINT("trans", ("aborting transaction"));

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	trx = check_trx_exists(thd);
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	/* Update the info whether we should skip XA steps that eat CPU time */
	trx->support_xa = (ibool)(thd->variables.innodb_support_xa);

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	/* 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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        if (trx->auto_inc_lock) {
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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 */
		
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		row_unlock_table_autoinc_for_mysql(trx);
	}

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        if (all
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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		error = trx_rollback_for_mysql(trx);
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                trx->active_trans = 0;
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	} else {
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		error = trx_rollback_last_sql_stat_for_mysql(trx);
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	}
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
Rolls back a transaction */

int
innobase_rollback_trx(
/*==================*/
			/* out: 0 or error number */
	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 (trx->auto_inc_lock) {
		/* 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, NULL));
}

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/*********************************************************************
Rolls back a transaction to a savepoint. */

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static int
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innobase_rollback_to_savepoint(
/*===========================*/
				/* out: 0 if success, HA_ERR_NO_SAVEPOINT if
				no savepoint with the given name */
	THD*	thd,		/* in: handle to the MySQL thread of the user
				whose transaction should be rolled back */
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        void *savepoint)        /* in: savepoint data */
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{
	ib_longlong mysql_binlog_cache_pos;
	int	    error = 0;
	trx_t*	    trx;
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        char 	    name[64];
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	DBUG_ENTER("innobase_rollback_to_savepoint");

	trx = check_trx_exists(thd);

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	/* 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. */
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	innobase_release_stat_resources(trx);
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        /* TODO: use provided savepoint data area to store savepoint data */
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        longlong2str((ulint)savepoint, name, 36);
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        error = (int) trx_rollback_to_savepoint_for_mysql(trx, name,
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						&mysql_binlog_cache_pos);
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
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}

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

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        /* TODO: use provided savepoint data area to store savepoint data */
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        longlong2str((ulint)savepoint, name, 36);
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	error = (int) trx_release_savepoint_for_mysql(trx, name);
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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

	DBUG_ENTER("innobase_savepoint");

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        /*
          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.
        */
        DBUG_ASSERT(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
                    thd->in_sub_stmt);
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	trx = check_trx_exists(thd);

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	/* 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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        /* cannot happen outside of transaction */
        DBUG_ASSERT(trx->active_trans);
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        /* TODO: use provided savepoint data area to store savepoint data */
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        char name[64];
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        longlong2str((ulint)savepoint,name,36);
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        error = (int) trx_savepoint_for_mysql(trx, name, (ib_longlong)0);
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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

	trx = (trx_t*)thd->ha_data[innobase_hton.slot];

	ut_a(trx);

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

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	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);
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	innobase_rollback_trx(trx);

        trx_free_for_mysql(trx);

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	return(0);
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}
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/*****************************************************************************
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** InnoDB database tables
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*****************************************************************************/

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/********************************************************************
Get the record format from the data dictionary. */
enum row_type
ha_innobase::get_row_type() const
/*=============================*/
			/* out: ROW_TYPE_REDUNDANT or ROW_TYPE_COMPACT */
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	if (prebuilt && prebuilt->table) {
		if (prebuilt->table->comp) {
			return(ROW_TYPE_COMPACT);
		} else {
			return(ROW_TYPE_REDUNDANT);
		}
	}
	ut_ad(0);
	return(ROW_TYPE_NOT_USED);
}

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/********************************************************************
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Gives the file extension of an InnoDB single-table tablespace. */
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static const char* ha_innobase_exts[] = {
  ".ibd",
  NullS
};
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const char**
ha_innobase::bas_ext() const
/*========================*/
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				/* out: file extension string */
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{
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  return ha_innobase_exts;
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}

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/*********************************************************************
Normalizes a table name string. A normalized name consists of the
database name catenated to '/' and table name. An example:
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test/mytable. On Windows normalization puts both the database name and the
table name always to lower case. */
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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 */

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	ptr = strend(name)-1;
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	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	name_ptr = ptr + 1;

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	DBUG_ASSERT(ptr > name);
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	ptr--;
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	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] = '/';
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#ifdef __WIN__
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	innobase_casedn_str(norm_name);
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#endif
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}
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/*********************************************************************
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Creates and opens a handle to a table which already exists in an InnoDB
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database. */

int
ha_innobase::open(
/*==============*/
					/* out: 1 if error, 0 if success */
	const char*	name,		/* in: table name */
	int 		mode,		/* in: not used */
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	uint 		test_if_locked)	/* in: not used */
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{
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	dict_table_t*	ib_table;
  	char		norm_name[1000];
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	THD*		thd;
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	DBUG_ENTER("ha_innobase::open");

	UT_NOT_USED(mode);
	UT_NOT_USED(test_if_locked);

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	thd = current_thd;
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	normalize_table_name(norm_name, name);

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	user_thd = NULL;

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	last_query_id = (ulong)-1;

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

		DBUG_RETURN(1);
	}
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	/* 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. */
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	upd_and_key_val_buff_len =
				table->s->reclength + table->s->max_key_length
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							+ MAX_REF_PARTS * 3;
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	if (!(mysql_byte*) my_multi_malloc(MYF(MY_WME),
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				     &upd_buff, upd_and_key_val_buff_len,
				     &key_val_buff, upd_and_key_val_buff_len,
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				     NullS)) {
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	  	free_share(share);
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	  	DBUG_RETURN(1);
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  	}

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	/* Get pointer to a table object in InnoDB dictionary cache */
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	ib_table = dict_table_get_and_increment_handle_count(
				      		     norm_name, NULL);
 	if (NULL == ib_table) {
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	        ut_print_timestamp(stderr);
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		sql_print_error("Cannot find table %s from the internal data "
				"dictionary\nof InnoDB though the .frm file "
				"for the table exists. Maybe you\nhave "
				"deleted and recreated InnoDB data files but "
				"have forgotten\nto delete the corresponding "
				".frm files of InnoDB tables, or you\n"
				"have moved .frm files to another database?\n"
				"Look from section 15.1 of "
				"http://www.innodb.com/ibman.html\n"
				"how you can resolve the problem.\n",
				norm_name);
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	        free_share(share);
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    		my_free((gptr) upd_buff, MYF(0));
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    		my_errno = ENOENT;
2445

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    		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
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  	}

2449
 	if (ib_table->ibd_file_missing && !thd->tablespace_op) {
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	        ut_print_timestamp(stderr);
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		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"
				"Look from section 15.1 of "
				"http://www.innodb.com/ibman.html\n"
				"how you can resolve the problem.\n",
				norm_name);
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	        free_share(share);
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    		my_free((gptr) upd_buff, MYF(0));
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    		my_errno = ENOENT;
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		dict_table_decrement_handle_count(ib_table);
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    		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
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  	}

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	innobase_prebuilt = row_create_prebuilt(ib_table);
2469

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	((row_prebuilt_t*)innobase_prebuilt)->mysql_row_len =
							table->s->reclength;
2472

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

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 	primary_key = table->s->primary_key;
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	key_used_on_scan = primary_key;
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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! */
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  	if (!row_table_got_default_clust_index(ib_table)) {
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	        if (primary_key >= MAX_KEY) {
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		  sql_print_error("Table %s has a primary key in InnoDB data "
				  "dictionary, but not in MySQL!", name);
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		}
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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = FALSE;
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 		/* 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. */
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  		ref_length = table->key_info[primary_key].key_length;
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	} else {
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	        if (primary_key != MAX_KEY) {
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		  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);
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		}

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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = TRUE;

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  		ref_length = DATA_ROW_ID_LEN;
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		/* 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. */
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		if (key_used_on_scan != MAX_KEY) {
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		  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);
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		}
2530
	}
2531

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

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Merge  
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	/* Init table lock structure */
2536
	thr_lock_data_init(&share->lock,&lock,(void*) 0);
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  	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
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  	DBUG_RETURN(0);
}

/**********************************************************************
2544
Closes a handle to an InnoDB table. */
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int
ha_innobase::close(void)
/*====================*/
2549
				/* out: 0 */
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{
  	DBUG_ENTER("ha_innobase::close");

	row_prebuilt_free((row_prebuilt_t*) innobase_prebuilt);

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

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

	srv_active_wake_master_thread();

  	DBUG_RETURN(0);
}

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

/******************************************************************
Gets field offset for a field in a table. */
inline
uint
get_field_offset(
/*=============*/
			/* out: offset */
	TABLE*	table,	/* in: MySQL table object */
	Field*	field)	/* in: MySQL field object */
{
	return((uint) (field->ptr - (char*) 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. */
inline
uint
field_in_record_is_null(
/*====================*/
			/* out: 1 if NULL, 0 otherwise */
	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. */
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;
}

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extern "C" {
/*****************************************************************
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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! */
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int
innobase_mysql_cmp(
2639
/*===============*/
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					/* out: 1, 0, -1, if a is greater,
					equal, less than b, respectively */
2642
	int		mysql_type,	/* in: MySQL type */
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	uint		charset_number,	/* in: number of the charset */
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	unsigned char*	a,		/* in: data field */
	unsigned int	a_length,	/* in: data field length,
					not UNIV_SQL_NULL */
	unsigned char*	b,		/* in: data field */
	unsigned int	b_length)	/* in: data field length,
					not UNIV_SQL_NULL */
{
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	CHARSET_INFO*		charset;
2652
	enum_field_types	mysql_tp;
2653
	int                     ret;
2654

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	DBUG_ASSERT(a_length != UNIV_SQL_NULL);
	DBUG_ASSERT(b_length != UNIV_SQL_NULL);
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	mysql_tp = (enum_field_types) mysql_type;

	switch (mysql_tp) {

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        case MYSQL_TYPE_BIT:
2663
	case MYSQL_TYPE_STRING:
2664
	case MYSQL_TYPE_VAR_STRING:
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	case FIELD_TYPE_TINY_BLOB:
	case FIELD_TYPE_MEDIUM_BLOB:
	case FIELD_TYPE_BLOB:
	case FIELD_TYPE_LONG_BLOB:
2669
        case MYSQL_TYPE_VARCHAR:
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		/* 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) {
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			  sql_print_error("InnoDB needs charset %lu for doing "
					  "a comparison, but MySQL cannot "
					  "find that charset.",
					  (ulong) charset_number);
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				ut_a(0);
			}
		}

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                /* 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,
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                                  a, a_length,
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                                                 b, b_length, 0);
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		if (ret < 0) {
2700
		        return(-1);
2701
		} else if (ret > 0) {
2702
		        return(1);
2703
		} else {
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		        return(0);
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	        }
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	default:
		assert(0);
	}

	return(0);
}
}

/******************************************************************
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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'. */
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inline
ulint
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get_innobase_type_from_mysql_type(
/*==============================*/
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				/* out: DATA_BINARY, DATA_VARCHAR, ... */
	ulint*	unsigned_flag,	/* out: DATA_UNSIGNED if an 'unsigned type';
				at least ENUM and SET, and unsigned integer
				types are 'unsigned types' */
	Field*	field)		/* in: MySQL field */
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{
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	/* 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 */
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	DBUG_ASSERT((ulint)FIELD_TYPE_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_VAR_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DOUBLE < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_FLOAT < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DECIMAL < 256);

	if (field->flags & UNSIGNED_FLAG) {

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

	if (field->real_type() == FIELD_TYPE_ENUM
	    || field->real_type() == FIELD_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);
	}

2759
	switch (field->type()) {
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	        /* NOTE that we only allow string types in DATA_MYSQL
		and DATA_VARMYSQL */
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                case MYSQL_TYPE_VAR_STRING: /* old <= 4.1 VARCHAR */
                case MYSQL_TYPE_VARCHAR:    /* new >= 5.0.3 true VARCHAR */
					if (field->binary()) {
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						return(DATA_BINARY);
					} else if (strcmp(
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						  field->charset()->name,
						 "latin1_swedish_ci") == 0) {
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						return(DATA_VARCHAR);
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					} else {
						return(DATA_VARMYSQL);
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					}
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                case MYSQL_TYPE_BIT:
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		case MYSQL_TYPE_STRING: if (field->binary()) {
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						return(DATA_FIXBINARY);
					} else if (strcmp(
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						   field->charset()->name,
						   "latin1_swedish_ci") == 0) {
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						return(DATA_CHAR);
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					} else {
						return(DATA_MYSQL);
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					}
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                case FIELD_TYPE_NEWDECIMAL:
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                                        return(DATA_FIXBINARY);
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		case FIELD_TYPE_LONG:
		case FIELD_TYPE_LONGLONG:
		case FIELD_TYPE_TINY:
		case FIELD_TYPE_SHORT:
		case FIELD_TYPE_INT24:
		case FIELD_TYPE_DATE:
		case FIELD_TYPE_DATETIME:
		case FIELD_TYPE_YEAR:
		case FIELD_TYPE_NEWDATE:
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		case FIELD_TYPE_TIME:
		case FIELD_TYPE_TIMESTAMP:
					return(DATA_INT);
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		case FIELD_TYPE_FLOAT:
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					return(DATA_FLOAT);
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		case FIELD_TYPE_DOUBLE:
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					return(DATA_DOUBLE);
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		case FIELD_TYPE_DECIMAL:
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					return(DATA_DECIMAL);
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		case FIELD_TYPE_GEOMETRY:
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		case FIELD_TYPE_TINY_BLOB:
		case FIELD_TYPE_MEDIUM_BLOB:
		case FIELD_TYPE_BLOB:
		case FIELD_TYPE_LONG_BLOB:
					return(DATA_BLOB);
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		default:
					assert(0);
	}

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

2846
/***********************************************************************
2847
Stores a key value for a row to a buffer. */
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uint
ha_innobase::store_key_val_for_row(
/*===============================*/
				/* out: key value length as stored in buff */
	uint 		keynr,	/* in: key number */
	char*		buff,	/* in/out: buffer for the key value (in MySQL
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				format) */
	uint		buff_len,/* in: buffer length */
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	const mysql_byte* record)/* in: row in MySQL format */
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{
	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;
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	enum_field_types mysql_type;
	Field*		field;
	ulint		blob_len;
	byte*		blob_data;
	ibool		is_null;
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  	DBUG_ENTER("store_key_val_for_row");

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	/* 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
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	value is the SQL NULL then these data bytes are set to 0.
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	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
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	simple memcmp to compare two key values to determine if they are
	equal. MySQL does this to compare contents of two 'ref' values. */
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	bzero(buff, buff_len);
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  	for (; key_part != end; key_part++) {
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2899
	        is_null = FALSE;
2900 2901 2902 2903

    		if (key_part->null_bit) {
      			if (record[key_part->null_offset]
						& key_part->null_bit) {
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2904 2905 2906 2907 2908 2909
				*buff = 1;
				is_null = TRUE;
      			} else {
				*buff = 0;
			}
			buff++;
2910
    		}
2911

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2912 2913 2914
		field = key_part->field;
		mysql_type = field->type();

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2915 2916 2917 2918 2919
		if (mysql_type == MYSQL_TYPE_VARCHAR) {
						/* >= 5.0.3 true VARCHAR */
			ulint	lenlen;
			ulint	len;
			byte*	data;
2920 2921 2922
			ulint	key_len;
			CHARSET_INFO*	cs;
			int	error=0;
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2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936

			if (is_null) {
				buff += key_part->length + 2;
				
				continue;
			}

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

			data = row_mysql_read_true_varchar(&len, 
				(byte*) (record
				+ (ulint)get_field_offset(table, field)),
				lenlen);
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2937 2938 2939

			/* In a column prefix index, we may need to truncate
			the stored value: */
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2940
		
2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954
			cs = key_part->field->charset();

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

			if (len > key_len) {
				len = key_len;
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2955 2956
			}

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

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

			memcpy(buff, data, 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_part->length;

		} else if (mysql_type == FIELD_TYPE_TINY_BLOB
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2974 2975 2976
		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
2977

2978 2979 2980 2981 2982
			CHARSET_INFO*	cs;
			ulint		key_len;
			ulint		len;
			int		error=0;

2983
			ut_a(key_part->key_part_flag & HA_PART_KEY_SEG);
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2984 2985

		        if (is_null) {
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2986
				buff += key_part->length + 2;
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2987
				 
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2988
				continue;
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2989 2990 2991 2992
			}
		    
		        blob_data = row_mysql_read_blob_ref(&blob_len,
				(byte*) (record
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2993
				+ (ulint)get_field_offset(table, field)),
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2994 2995
					(ulint) field->pack_length());

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2996 2997
			ut_a(get_field_offset(table, field)
						     == key_part->offset);
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2998 2999 3000

			/* All indexes on BLOB and TEXT are column prefix
			indexes, and we may need to truncate the data to be
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3001
			stored in the key value: */
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3002

3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017
			cs = key_part->field->charset();
			
			if (cs->mbmaxlen > 1 && key_part->length > 0) {
				key_len = (ulint) cs->cset->well_formed_len(cs, 
					(const char *) blob_data,
					(const char *) blob_data 
						+ key_part->length,
					key_part->length / cs->mbmaxlen,
					&error);
			} else {
				key_len = key_part->length;
			}

			if (blob_len > key_len) {
				blob_len = key_len;
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3018 3019 3020 3021 3022
			}

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

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3023 3024
			innobase_write_to_2_little_endian(
					(byte*)buff, (ulint)blob_len);
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3025 3026 3027 3028
			buff += 2;

			memcpy(buff, blob_data, blob_len);

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3029 3030 3031
			/* Note that we always reserve the maximum possible
			length of the BLOB prefix in the key value. */

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3032 3033
			buff += key_part->length;
		} else {
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3034 3035 3036 3037 3038
			/* 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. */

3039 3040 3041 3042 3043
			CHARSET_INFO*		cs;
			ulint			len;
			const mysql_byte*	src_start;
			int			error=0;

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3044 3045 3046 3047 3048
		        if (is_null) {
				 buff += key_part->length;
				 
				 continue;
			}
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heikki@hundin.mysql.fi committed
3049

3050 3051 3052 3053 3054
			cs = key_part->field->charset();
			src_start = record + key_part->offset;

			if (key_part->length > 0 && cs->mbmaxlen > 1) {
				len = (ulint) cs->cset->well_formed_len(cs, 
3055 3056
					(const char *) src_start,
					(const char *) src_start + key_part->length,
3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072
					key_part->length / cs->mbmaxlen, 
					&error);
			} else {
				len = key_part->length;
			}

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

			/* Pad the unused space with spaces */

			if (len < key_part->length) {
				len = key_part->length - len;
				memset(buff, ' ', len);
				buff+=len;
			}
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3073
		}
3074 3075
  	}

3076
	ut_a(buff <= buff_start + buff_len);
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3077 3078

	DBUG_RETURN((uint)(buff - buff_start));
3079 3080 3081
}

/******************************************************************
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3082 3083
Builds a 'template' to the prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */
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3084
static
3085
void
3086 3087 3088 3089 3090 3091 3092 3093 3094
build_template(
/*===========*/
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct */
	THD*		thd,		/* in: current user thread, used
					only if templ_type is
					ROW_MYSQL_REC_FIELDS */
	TABLE*		table,		/* in: MySQL table */
	ulint		templ_type)	/* in: ROW_MYSQL_WHOLE_ROW or
					ROW_MYSQL_REC_FIELDS */
3095
{
3096 3097
	dict_index_t*	index;
	dict_index_t*	clust_index;
3098
	mysql_row_templ_t* templ;
3099
	Field*		field;
3100 3101
	ulint		n_fields;
	ulint		n_requested_fields	= 0;
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Merge  
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3102
	ibool		fetch_all_in_key	= FALSE;
3103
	ibool		fetch_primary_key_cols	= FALSE;
3104
	ulint		i;
3105 3106
	/* byte offset of the end of last requested column */
	ulint		mysql_prefix_len	= 0;
3107

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3108 3109 3110 3111
	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. */
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3112

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3113 3114 3115
	        templ_type = ROW_MYSQL_WHOLE_ROW;
	}

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3116 3117 3118
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
	     if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_ALL_COLS) {
3119

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3120 3121
		/* We know we must at least fetch all columns in the key, or
		all columns in the table */
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3122

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Merge  
monty@donna.mysql.fi committed
3123
		if (prebuilt->read_just_key) {
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3124
			/* MySQL has instructed us that it is enough to
3125 3126 3127 3128 3129
			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 */
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3130

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Merge  
monty@donna.mysql.fi committed
3131 3132 3133 3134
			fetch_all_in_key = TRUE;
		} else {
			templ_type = ROW_MYSQL_WHOLE_ROW;
		}
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3135 3136
	    } else if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_PRIMARY_KEY) {
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3137 3138 3139 3140 3141
		/* 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. */
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3142 3143 3144

		fetch_primary_key_cols = TRUE;
	    }
3145 3146
	}

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3147
	clust_index = dict_table_get_first_index_noninline(prebuilt->table);
3148

3149
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
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3150
		index = prebuilt->index;
3151 3152
	} else {
		index = clust_index;
3153
	}
3154

3155 3156 3157 3158 3159 3160 3161
	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 */
	}
3162

3163
	n_fields = (ulint)table->s->fields; /* number of columns */
3164 3165 3166 3167 3168 3169

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
						mem_alloc_noninline(
					n_fields * sizeof(mysql_row_templ_t));
	}
3170

3171
	prebuilt->template_type = templ_type;
3172
	prebuilt->null_bitmap_len = table->s->null_bytes;
3173

3174 3175
	prebuilt->templ_contains_blob = FALSE;

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3176 3177
	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
3178
	for (i = 0; i < n_fields; i++) {
3179
		templ = prebuilt->mysql_template + n_requested_fields;
3180 3181
		field = table->field[i];

3182 3183 3184 3185 3186
		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);
3187

3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200
			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;
			}

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Merge  
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3201 3202
			if (table->file->ha_get_bit_in_read_set(i+1) ||
			    table->file->ha_get_bit_in_write_set(i+1)) {
3203 3204 3205 3206
				/* This field is needed in the query */

				goto include_field;
			}
3207

3208 3209 3210 3211 3212 3213 3214
			if (fetch_primary_key_cols
			    && dict_table_col_in_clustered_key(index->table,
									i)) {
				/* This field is needed in the query */

				goto include_field;
			}
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3215 3216

			/* This field is not needed in the query, skip it */
3217 3218 3219

			goto skip_field;
		}
3220
include_field:
3221
		n_requested_fields++;
3222

3223
		templ->col_no = i;
3224

3225 3226 3227
		if (index == clust_index) {
			templ->rec_field_no = (index->table->cols + i)
								->clust_pos;
3228
		} else {
3229 3230
			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
3231 3232
		}

3233 3234 3235 3236 3237 3238 3239 3240
		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]);
3241

3242 3243 3244 3245
			templ->mysql_null_bit_mask = (ulint) field->null_bit;
		} else {
			templ->mysql_null_bit_mask = 0;
		}
3246

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3247 3248 3249
		templ->mysql_col_offset = (ulint)
					get_field_offset(table, field);

3250
		templ->mysql_col_len = (ulint) field->pack_length();
3251 3252 3253 3254 3255
		if (mysql_prefix_len < templ->mysql_col_offset
				+ templ->mysql_col_len) {
			mysql_prefix_len = templ->mysql_col_offset
				+ templ->mysql_col_len;
		}
3256
		templ->type = index->table->cols[i].type.mtype;
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3257 3258 3259 3260 3261 3262 3263
		templ->mysql_type = (ulint)field->type();

		if (templ->mysql_type == DATA_MYSQL_TRUE_VARCHAR) {
			templ->mysql_length_bytes = (ulint)
				    (((Field_varstring*)field)->length_bytes);
		}
	
3264 3265
		templ->charset = dtype_get_charset_coll_noninline(
				index->table->cols[i].type.prtype);
3266 3267
		templ->mbminlen = index->table->cols[i].type.mbminlen;
		templ->mbmaxlen = index->table->cols[i].type.mbmaxlen;
3268 3269
		templ->is_unsigned = index->table->cols[i].type.prtype
							& DATA_UNSIGNED;
3270 3271
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
3272
		}
3273 3274 3275
skip_field:
		;
	}
3276

3277
	prebuilt->n_template = n_requested_fields;
3278
	prebuilt->mysql_prefix_len = mysql_prefix_len;
3279

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heikki@hundin.mysql.fi committed
3280
	if (index != clust_index && prebuilt->need_to_access_clustered) {
3281 3282 3283 3284
		/* 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;
3285

3286 3287 3288
			templ->rec_field_no =
			    (index->table->cols + templ->col_no)->clust_pos;
		}
3289
	}
3290 3291 3292
}

/************************************************************************
3293
Stores a row in an InnoDB database, to the table specified in this
3294 3295 3296 3297 3298
handle. */

int
ha_innobase::write_row(
/*===================*/
3299 3300
				/* out: error code */
	mysql_byte* 	record)	/* in: a row in MySQL format */
3301
{
3302
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
3303
  	int 		error;
3304
	longlong	auto_inc;
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3305
	longlong	dummy;
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3306
	ibool           auto_inc_used= FALSE;
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monty@hundin.mysql.fi committed
3307

3308
  	DBUG_ENTER("ha_innobase::write_row");
3309

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3310
	if (prebuilt->trx !=
3311
                        (trx_t*) current_thd->ha_data[innobase_hton.slot]) {
3312 3313 3314 3315
	  sql_print_error("The transaction object for the table handle is at "
			  "%p, but for the current thread it is at %p",
			  prebuilt->trx,
			  (trx_t*) current_thd->ha_data[innobase_hton.slot]);
3316

3317 3318 3319 3320 3321 3322
		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 transaction.all: ",
			stderr);
		ut_print_buf(stderr,
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3323 3324
           	 ((byte*)(&(current_thd->ha_data[innobase_hton.slot]))) - 100,
								200);
3325 3326
		putc('\n', stderr);
		ut_error;
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3327
	}
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3328

3329 3330
  	statistic_increment(current_thd->status_var.ha_write_count,
			    &LOCK_status);
3331

3332 3333
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
                table->timestamp_field->set_time();
3334

3335
	if ((user_thd->lex->sql_command == SQLCOM_ALTER_TABLE
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3336
	    || user_thd->lex->sql_command == SQLCOM_OPTIMIZE
3337 3338
	    || user_thd->lex->sql_command == SQLCOM_CREATE_INDEX
	    || user_thd->lex->sql_command == SQLCOM_DROP_INDEX)
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marko@hundin.mysql.fi committed
3339
	    && num_write_row >= 10000) {
3340 3341 3342 3343 3344 3345 3346 3347
		/* 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. */
3348

3349
		dict_table_t*	src_table;
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3350
		ulint		mode;
3351

3352
		num_write_row = 0;
3353

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marko@hundin.mysql.fi committed
3354 3355
		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */
3356 3357 3358 3359 3360 3361

		/* Altering an InnoDB table */
		/* Get the source table. */
		src_table = lock_get_src_table(
				prebuilt->trx, prebuilt->table, &mode);
		if (!src_table) {
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3362
no_commit:
3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
			/* Unknown situation: do not commit */
			/*
			ut_print_timestamp(stderr);
			fprintf(stderr,
				"  InnoDB error: 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. */

3376
			/* Altering to InnoDB format */
serg@serg.mylan's avatar
serg@serg.mylan committed
3377
                        innobase_commit(user_thd, 1);
3378
			/* Note that this transaction is still active. */
3379
			prebuilt->trx->active_trans = 1;
3380 3381
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
3382 3383 3384
		} else {
			/* Ensure that there are no other table locks than
			LOCK_IX and LOCK_AUTO_INC on the destination table. */
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3385

3386 3387
			if (!lock_is_table_exclusive(prebuilt->table,
							prebuilt->trx)) {
3388 3389 3390 3391 3392
				goto no_commit;
			}

			/* Commit the transaction.  This will release the table
			locks, so they have to be acquired again. */
serg@serg.mylan's avatar
serg@serg.mylan committed
3393
                        innobase_commit(user_thd, 1);
3394
			/* Note that this transaction is still active. */
3395
			prebuilt->trx->active_trans = 1;
3396
			/* Re-acquire the table lock on the source table. */
3397
			row_lock_table_for_mysql(prebuilt, src_table, mode);
3398 3399 3400
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
		}
3401 3402
	}

marko@hundin.mysql.fi's avatar
marko@hundin.mysql.fi committed
3403 3404
	num_write_row++;

3405 3406 3407
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
3408 3409

		innobase_release_stat_resources(prebuilt->trx);
3410 3411
	}

3412
  	if (table->next_number_field && record == table->record[0]) {
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3413 3414
		/* This is the case where the table has an
		auto-increment column */
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heikki@hundin.mysql.fi committed
3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439

		/* Initialize the auto-inc counter if it has not been
		initialized yet */

		if (0 == dict_table_autoinc_peek(prebuilt->table)) {

			/* This call initializes the counter */
		        error = innobase_read_and_init_auto_inc(&dummy);

			if (error) {
				/* Deadlock or lock wait timeout */

				goto func_exit;
			}

			/* We have to set sql_stat_start to TRUE because
			the above call probably has called a select, and
			has reset that flag; row_insert_for_mysql has to
			know to set the IX intention lock on the table,
			something it only does at the start of each
			statement */

			prebuilt->sql_stat_start = TRUE;
		}

3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459
		/* We have to use the transactional lock mechanism on the
		auto-inc counter of the table to ensure that replication and
		roll-forward of the binlog exactly imitates also the given
		auto-inc values. The lock is released at each SQL statement's
		end. This lock also prevents a race where two threads would
		call ::get_auto_increment() simultaneously. */

		error = row_lock_table_autoinc_for_mysql(prebuilt);

		if (error != DB_SUCCESS) {
			/* Deadlock or lock wait timeout */

			error = convert_error_code_to_mysql(error, user_thd);

			goto func_exit;
		}

		/* We must use the handler code to update the auto-increment
                value to be sure that we increment it correctly. */

3460
    		update_auto_increment();
3461
                auto_inc_used = 1;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3462

3463
	}
3464

3465 3466 3467 3468
	if (prebuilt->mysql_template == NULL
			|| prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
3469

3470 3471
		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}
3472

3473
	innodb_srv_conc_enter_innodb(prebuilt->trx);
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3474

3475
	error = row_insert_for_mysql((byte*) record, prebuilt);
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3476

3477
	if (error == DB_SUCCESS && auto_inc_used) {
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3478

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3479
        	/* Fetch the value that was set in the autoincrement field */
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3480

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heikki@hundin.mysql.fi committed
3481
          	auto_inc = table->next_number_field->val_int();
3482

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3483
          	if (auto_inc != 0) {
3484 3485
			/* This call will update the counter according to the
			value that was inserted in the table */
3486

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3487 3488
            		dict_table_autoinc_update(prebuilt->table, auto_inc);
          	}
3489
        }
3490

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heikki@hundin.mysql.fi committed
3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507
        /* A REPLACE command and LOAD DATA INFILE REPLACE handle a duplicate
        key error themselves, and we must update the autoinc counter if we are
        performing those statements. */

        if (error == DB_DUPLICATE_KEY && auto_inc_used
            && (user_thd->lex->sql_command == SQLCOM_REPLACE
                || user_thd->lex->sql_command == SQLCOM_REPLACE_SELECT
                || (user_thd->lex->sql_command == SQLCOM_LOAD
                    && user_thd->lex->duplicates == DUP_REPLACE))) {

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

                if (auto_inc != 0) {
                        dict_table_autoinc_update(prebuilt->table, auto_inc);
                }
        }

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3508
	innodb_srv_conc_exit_innodb(prebuilt->trx);
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3509

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3510
	error = convert_error_code_to_mysql(error, user_thd);
3511

3512
	/* Tell InnoDB server that there might be work for
3513
	utility threads: */
3514
func_exit:
3515
	innobase_active_small();
3516 3517 3518 3519

  	DBUG_RETURN(error);
}

3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530
/**************************************************************************
Checks which fields have changed in a row and stores information
of them to an update vector. */
static
int
calc_row_difference(
/*================*/
					/* out: error number or 0 */
	upd_t*		uvect,		/* in/out: update vector */
	mysql_byte* 	old_row,	/* in: old row in MySQL format */
	mysql_byte* 	new_row,	/* in: new row in MySQL format */
3531 3532
	struct st_table* table,		/* in: table in MySQL data
					dictionary */
3533
	mysql_byte*	upd_buff,	/* in: buffer to use */
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heikki@hundin.mysql.fi committed
3534
	ulint		buff_len,	/* in: buffer length */
3535
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
3536 3537
	THD*		thd)		/* in: user thread */
{
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3538
	mysql_byte*	original_upd_buff = upd_buff;
3539
	Field*		field;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3540
	enum_field_types field_mysql_type;
3541 3542 3543
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3544
	ulint		col_pack_len;
3545
	byte*		new_mysql_row_col;
3546 3547 3548
	byte*	        o_ptr;
        byte*	        n_ptr;
        byte*	        buf;
3549
	upd_field_t*	ufield;
3550
	ulint		col_type;
3551
	ulint		n_changed = 0;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3552
	dfield_t	dfield;
3553
	uint		i;
3554

3555
	n_fields = table->s->fields;
3556

3557
	/* We use upd_buff to convert changed fields */
3558
	buf = (byte*) upd_buff;
3559

3560 3561 3562
	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

3563
		/* if (thd->query_id != field->query_id) { */
3564 3565
			/* TODO: check that these fields cannot have
			changed! */
3566

3567 3568
		/*	goto skip_field;
		}*/
3569

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heikki@hundin.mysql.fi committed
3570 3571
		o_ptr = (byte*) old_row + get_field_offset(table, field);
		n_ptr = (byte*) new_row + get_field_offset(table, field);
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heikki@hundin.mysql.fi committed
3572
		
3573 3574 3575
		/* Use new_mysql_row_col and col_pack_len save the values */

		new_mysql_row_col = n_ptr;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3576
		col_pack_len = field->pack_length();
3577

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3578 3579
		o_len = col_pack_len;
		n_len = col_pack_len;
3580

3581 3582 3583
		/* We use o_ptr and n_ptr to dig up the actual data for
		comparison. */ 

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3584 3585
		field_mysql_type = field->type();
	
3586
		col_type = prebuilt->table->cols[i].type.mtype;
3587 3588 3589 3590 3591 3592

		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);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3593

3594
			break;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3595

3596 3597 3598
		case DATA_VARCHAR:
		case DATA_BINARY:
		case DATA_VARMYSQL:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615
			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;
3616 3617 3618
		default:
			;
		}
3619

3620
		if (field->null_ptr) {
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3621 3622
			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
3623 3624
				o_len = UNIV_SQL_NULL;
			}
3625

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3626 3627
			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
3628 3629 3630 3631 3632 3633 3634 3635 3636
				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;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647
	
			/* Let us use a dummy dfield to make the conversion
			from the MySQL column format to the InnoDB format */

			dfield.type = (prebuilt->table->cols + i)->type;

			if (n_len != UNIV_SQL_NULL) {
				buf = row_mysql_store_col_in_innobase_format(
						&dfield,
						(byte*)buf,
						TRUE,
3648
						new_mysql_row_col,
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3649 3650
						col_pack_len,
						prebuilt->table->comp);
3651 3652
				ufield->new_val.data = dfield.data;
				ufield->new_val.len = dfield.len;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3653 3654 3655 3656
			} else {
				ufield->new_val.data = NULL;
				ufield->new_val.len = UNIV_SQL_NULL;
			}
3657 3658

			ufield->exp = NULL;
3659
			ufield->field_no = prebuilt->table->cols[i].clust_pos;
3660 3661 3662 3663 3664 3665 3666
			n_changed++;
		}
	}

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

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3667 3668
	ut_a(buf <= (byte*)original_upd_buff + buff_len);

3669 3670 3671 3672 3673 3674 3675
	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.
3676
TODO: currently InnoDB does not prevent the 'Halloween problem':
3677 3678
in a searched update a single row can get updated several times
if its index columns are updated! */
3679

3680 3681 3682 3683
int
ha_innobase::update_row(
/*====================*/
					/* out: error number or 0 */
3684 3685
	const mysql_byte* 	old_row,/* in: old row in MySQL format */
	mysql_byte* 		new_row)/* in: new row in MySQL format */
3686 3687 3688 3689 3690
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	upd_t*		uvect;
	int		error = 0;

3691
	DBUG_ENTER("ha_innobase::update_row");
3692

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3693
	ut_ad(prebuilt->trx ==
3694
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3695

3696 3697
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
                table->timestamp_field->set_time();
3698

3699 3700 3701
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
3702 3703

		innobase_release_stat_resources(prebuilt->trx);
3704 3705
	}

3706 3707 3708 3709 3710
	if (prebuilt->upd_node) {
		uvect = prebuilt->upd_node->update;
	} else {
		uvect = row_get_prebuilt_update_vector(prebuilt);
	}
3711 3712 3713 3714

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

3715
	calc_row_difference(uvect, (mysql_byte*) old_row, new_row, table,
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3716 3717 3718
			upd_buff, (ulint)upd_and_key_val_buff_len,
			prebuilt, user_thd);

3719 3720 3721
	/* This is not a delete */
	prebuilt->upd_node->is_delete = FALSE;

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3722
	assert(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
3723

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3724
	innodb_srv_conc_enter_innodb(prebuilt->trx);
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3725

3726
	error = row_update_for_mysql((byte*) old_row, prebuilt);
3727

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3728
	innodb_srv_conc_exit_innodb(prebuilt->trx);
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3729

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3730
	error = convert_error_code_to_mysql(error, user_thd);
3731

3732
	/* Tell InnoDB server that there might be work for
3733 3734
	utility threads: */

3735
	innobase_active_small();
3736 3737 3738 3739 3740 3741 3742 3743 3744 3745

	DBUG_RETURN(error);
}

/**************************************************************************
Deletes a row given as the parameter. */

int
ha_innobase::delete_row(
/*====================*/
3746 3747
					/* out: error number or 0 */
	const mysql_byte* record)	/* in: a row in MySQL format */
3748 3749 3750 3751
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error = 0;

3752
	DBUG_ENTER("ha_innobase::delete_row");
3753

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3754
	ut_ad(prebuilt->trx ==
3755
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3756

3757 3758 3759
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
3760 3761

		innobase_release_stat_resources(prebuilt->trx);
3762 3763
	}

3764 3765 3766
	if (!prebuilt->upd_node) {
		row_get_prebuilt_update_vector(prebuilt);
	}
3767 3768

	/* This is a delete */
3769

3770
	prebuilt->upd_node->is_delete = TRUE;
3771

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heikki@hundin.mysql.fi committed
3772
	innodb_srv_conc_enter_innodb(prebuilt->trx);
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3773

3774
	error = row_update_for_mysql((byte*) record, prebuilt);
3775

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3776
	innodb_srv_conc_exit_innodb(prebuilt->trx);
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3777

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3778
	error = convert_error_code_to_mysql(error, user_thd);
3779

3780
	/* Tell the InnoDB server that there might be work for
3781 3782
	utility threads: */

3783
	innobase_active_small();
3784 3785 3786 3787

	DBUG_RETURN(error);
}

3788
/**************************************************************************
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heikki@hundin.mysql.fi committed
3789 3790 3791
Removes a new lock set on a row. 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. */
3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802

void
ha_innobase::unlock_row(void)
/*=========================*/
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	DBUG_ENTER("ha_innobase::unlock_row");

	if (last_query_id != user_thd->query_id) {
		ut_print_timestamp(stderr);
3803 3804 3805
		sql_print_error("last_query_id is %lu != user_thd_query_id is "
				"%lu", (ulong) last_query_id,
				(ulong) user_thd->query_id);
3806 3807 3808
		mem_analyze_corruption((byte *) prebuilt->trx);
		ut_error;
	}
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3809 3810 3811 3812
	
	if (srv_locks_unsafe_for_binlog) {
		row_unlock_for_mysql(prebuilt, FALSE);
	}
3813 3814
}

3815 3816 3817 3818 3819 3820 3821
/**********************************************************************
Initializes a handle to use an index. */

int
ha_innobase::index_init(
/*====================*/
			/* out: 0 or error number */
3822 3823
        uint 	keynr,	/* in: key (index) number */
        bool sorted)	/* in: 1 if result MUST be sorted according to index */
3824 3825 3826 3827
{
	int 	error	= 0;
  	DBUG_ENTER("index_init");

monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3828
	error = change_active_index(keynr);
3829 3830 3831 3832 3833

  	DBUG_RETURN(error);
}

/**********************************************************************
3834
Currently does nothing. */
3835 3836 3837 3838 3839 3840 3841

int
ha_innobase::index_end(void)
/*========================*/
{
	int 	error	= 0;
  	DBUG_ENTER("index_end");
3842
        active_index=MAX_KEY;
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  	DBUG_RETURN(error);
}

/*************************************************************************
Converts a search mode flag understood by MySQL to a flag understood
3848
by InnoDB. */
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inline
ulint
convert_search_mode_to_innobase(
/*============================*/
	enum ha_rkey_function	find_flag)
{
	switch (find_flag) {
  		case HA_READ_KEY_EXACT:		return(PAGE_CUR_GE);
  			/* the above does not require the index to be UNIQUE */
  		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);
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	        case HA_READ_PREFIX_LAST:       return(PAGE_CUR_LE);
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                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
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		  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
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		  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. */

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		default:			assert(0);
	}

	return(0);
}
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/*
   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. */


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/**************************************************************************
Positions an index cursor to the index specified in the handle. Fetches the
row if any. */

int
ha_innobase::index_read(
/*====================*/
					/* out: 0, HA_ERR_KEY_NOT_FOUND,
					or error number */
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	mysql_byte*		buf,	/* in/out: buffer for the returned
3944
					row */
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	const mysql_byte* 	key_ptr,/* in: key value; if this is NULL
3946
					we position the cursor at the
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					start or end of index; this can
					also contain an InnoDB row id, in
					which case key_len is the InnoDB
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					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 */
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	uint			key_len,/* in: key value length */
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	enum ha_rkey_function find_flag)/* in: search flags from my_base.h */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		mode;
	dict_index_t*	index;
	ulint		match_mode 	= 0;
	int 		error;
	ulint		ret;

  	DBUG_ENTER("index_read");
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	ut_ad(prebuilt->trx ==
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                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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  	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
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	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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		innobase_release_stat_resources(prebuilt->trx);
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	}

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	index = prebuilt->index;
3980

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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 */
3983

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	if (prebuilt->sql_stat_start) {
		build_template(prebuilt, user_thd, table,
							ROW_MYSQL_REC_FIELDS);
	}
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	if (key_ptr) {
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	        /* Convert the search key value to InnoDB format into
		prebuilt->search_tuple */

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

 		dtuple_set_n_fields(prebuilt->search_tuple, 0);
	}
4005

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	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;
	}

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	last_match_mode = (uint) match_mode;
4019

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*) buf, mode, prebuilt, match_mode, 0);
4023

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql((int) ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	DBUG_RETURN(error);
}

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/***********************************************************************
The following functions works like index_read, but it find the last
row with the current key value or prefix. */
4048 4049

int
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ha_innobase::index_read_last(
/*=========================*/
			           /* out: 0, HA_ERR_KEY_NOT_FOUND, or an
				   error code */
        mysql_byte*       buf,     /* out: fetched row */
        const mysql_byte* 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 */
4059
{
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        return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
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}

4063
/************************************************************************
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Changes the active index of a handle. */
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int
ha_innobase::change_active_index(
/*=============================*/
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			/* out: 0 or error code */
	uint 	keynr)	/* in: use this index; MAX_KEY means always clustered
			index, even if it was internally generated by
4072
			InnoDB */
4073
{
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	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key=0;
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	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
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	DBUG_ENTER("change_active_index");
4079

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	ut_ad(user_thd == current_thd);
	ut_ad(prebuilt->trx ==
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             (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	active_index = keynr;
4085

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	if (keynr != MAX_KEY && table->s->keys > 0) {
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		key = table->key_info + active_index;
4088

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		prebuilt->index = dict_table_get_index_noninline(
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						     prebuilt->table,
						     key->name);
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        } else {
		prebuilt->index = dict_table_get_first_index_noninline(
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							   prebuilt->table);
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	}
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	if (!prebuilt->index) {
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	       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);
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	      DBUG_RETURN(1);
	}
4104

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	assert(prebuilt->search_tuple != 0);
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	dtuple_set_n_fields(prebuilt->search_tuple, prebuilt->index->n_fields);
4108

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	dict_index_copy_types(prebuilt->search_tuple, prebuilt->index,
4110
			prebuilt->index->n_fields);
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	/* 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. */
4117

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	build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);
4119

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	DBUG_RETURN(0);
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}

/**************************************************************************
Positions an index cursor to the index specified in keynr. Fetches the
row if any. */
/* ??? This is only used to read whole keys ??? */

int
ha_innobase::index_read_idx(
/*========================*/
					/* out: error number or 0 */
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	mysql_byte*	buf,		/* in/out: buffer for the returned
4133 4134
					row */
	uint 		keynr,		/* in: use this index */
4135
	const mysql_byte* key,		/* in: key value; if this is NULL
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					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 */
{
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	if (change_active_index(keynr)) {

		return(1);
	}
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	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. */

int
ha_innobase::general_fetch(
/*=======================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf,	/* in/out: buffer for next row in MySQL
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				format */
	uint 	direction,	/* in: ROW_SEL_NEXT or ROW_SEL_PREV */
	uint	match_mode)	/* in: 0, ROW_SEL_EXACT, or
				ROW_SEL_EXACT_PREFIX */
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
	int		error	= 0;
4167

4168
	DBUG_ENTER("general_fetch");
4169

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	ut_ad(prebuilt->trx ==
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             (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*)buf, 0, prebuilt, match_mode,
								direction);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql((int) ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	DBUG_RETURN(error);
}

/***************************************************************************
Reads the next row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::index_next(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf)	/* in/out: buffer for next row in MySQL
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				format */
{
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  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
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	return(general_fetch(buf, ROW_SEL_NEXT, 0));
}

/***********************************************************************
Reads the next row matching to the key value given as the parameter. */

int
ha_innobase::index_next_same(
/*=========================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf,	/* in/out: buffer for the row */
	const mysql_byte* key,	/* in: key value */
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	uint 		keylen)	/* in: key value length */
{
4228 4229
  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
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	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. */

int
ha_innobase::index_prev(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
4243
	mysql_byte* 	buf)	/* in/out: buffer for previous row in MySQL
4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255
				format */
{
	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. */

int
ha_innobase::index_first(
/*=====================*/
4256
				/* out: 0, HA_ERR_END_OF_FILE,
4257 4258
				or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
4259 4260 4261 4262
{
	int	error;

  	DBUG_ENTER("index_first");
4263 4264
  	statistic_increment(current_thd->status_var.ha_read_first_count,
			    &LOCK_status);
4265 4266 4267

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

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        /* 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;
  	}

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  	DBUG_RETURN(error);
}

/************************************************************************
Positions a cursor on the last record in an index and reads the
corresponding row to buf. */

int
ha_innobase::index_last(
/*====================*/
4284 4285
				/* out: 0, HA_ERR_END_OF_FILE, or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
4286 4287 4288
{
	int	error;

4289
  	DBUG_ENTER("index_last");
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  	statistic_increment(current_thd->status_var.ha_read_last_count,
			    &LOCK_status);
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  	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);

4295
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */
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  	if (error == HA_ERR_KEY_NOT_FOUND) {
  		error = HA_ERR_END_OF_FILE;
  	}

  	DBUG_RETURN(error);
}

/********************************************************************
Initialize a table scan. */

int
ha_innobase::rnd_init(
/*==================*/
			/* out: 0 or error number */
4311
	bool	scan)	/* in: ???????? */
4312
{
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	int	err;
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4315
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
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	/* Store the active index value so that we can restore the original
	value after a scan */

4320
	if (prebuilt->clust_index_was_generated) {
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		err = change_active_index(MAX_KEY);
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	} else {
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Merge  
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4323
		err = change_active_index(primary_key);
4324
	}
4325

4326
  	start_of_scan = 1;
4327

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4328
 	return(err);
4329 4330 4331
}

/*********************************************************************
4332
Ends a table scan. */
4333 4334 4335 4336 4337 4338

int
ha_innobase::rnd_end(void)
/*======================*/
				/* out: 0 or error number */
{
4339
	return(index_end());
4340 4341 4342 4343 4344 4345 4346 4347 4348 4349
}

/*********************************************************************
Reads the next row in a table scan (also used to read the FIRST row
in a table scan). */

int
ha_innobase::rnd_next(
/*==================*/
			/* out: 0, HA_ERR_END_OF_FILE, or error number */
4350
	mysql_byte* buf)/* in/out: returns the row in this buffer,
4351 4352
			in MySQL format */
{
4353
	int	error;
4354 4355

  	DBUG_ENTER("rnd_next");
4356 4357
  	statistic_increment(current_thd->status_var.ha_read_rnd_next_count,
			    &LOCK_status);
4358

4359
  	if (start_of_scan) {
4360 4361 4362 4363
		error = index_first(buf);
		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}
4364
		start_of_scan = 0;
4365
	} else {
4366
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
4367
	}
4368

4369 4370 4371 4372
  	DBUG_RETURN(error);
}

/**************************************************************************
4373
Fetches a row from the table based on a row reference. */
4374

4375 4376 4377
int
ha_innobase::rnd_pos(
/*=================*/
4378 4379 4380
				/* out: 0, HA_ERR_KEY_NOT_FOUND,
				or error code */
	mysql_byte* 	buf,	/* in/out: buffer for the row */
4381 4382 4383 4384 4385
	mysql_byte*	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 */
4386
{
4387 4388 4389
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error;
	uint		keynr	= active_index;
4390
	DBUG_ENTER("rnd_pos");
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4391
	DBUG_DUMP("key", (char*) pos, ref_length);
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4392

4393 4394
	statistic_increment(current_thd->status_var.ha_read_rnd_count,
			    &LOCK_status);
4395

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4396
	ut_ad(prebuilt->trx ==
4397
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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4398

4399 4400 4401 4402
	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
4403
		that MySQL knows of */
4404

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4405
		error = change_active_index(MAX_KEY);
4406
	} else {
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Merge  
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4407
		error = change_active_index(primary_key);
4408
	}
4409

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4410
	if (error) {
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4411
	        DBUG_PRINT("error", ("Got error: %ld", error));
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4412 4413
		DBUG_RETURN(error);
	}
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4414

4415 4416 4417 4418
	/* 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);
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4419 4420 4421

	if (error) {
		DBUG_PRINT("error", ("Got error: %ld", error));
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4422
	}
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4423

4424
	change_active_index(keynr);
4425

4426 4427 4428 4429
  	DBUG_RETURN(error);
}

/*************************************************************************
4430
Stores a reference to the current row to 'ref' field of the handle. Note
4431 4432
that in the case where we have generated the clustered index for the
table, the function parameter is illogical: we MUST ASSUME that 'record'
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4433
is the current 'position' of the handle, because if row ref is actually
4434
the row id internally generated in InnoDB, then 'record' does not contain
4435 4436
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
4437 4438 4439 4440

void
ha_innobase::position(
/*==================*/
4441
	const mysql_byte*	record)	/* in: row in MySQL format */
4442
{
4443 4444
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	uint		len;
4445

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4446
	ut_ad(prebuilt->trx ==
4447
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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4448

4449 4450 4451 4452
	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
4453
		that MySQL knows of */
4454 4455 4456 4457 4458

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
4459 4460
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
4461
	}
4462

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4463 4464
	/* We assume that the 'ref' value len is always fixed for the same
	table. */
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4465
  
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4466
	if (len != ref_length) {
4467 4468
	  sql_print_error("Stored ref len is %lu, but table ref len is %lu",
			  (ulong) len, (ulong) ref_length);  
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4469
	}
4470 4471 4472
}

/*********************************************************************
4473
Creates a table definition to an InnoDB database. */
4474 4475 4476 4477
static
int
create_table_def(
/*=============*/
4478
	trx_t*		trx,		/* in: InnoDB transaction handle */
4479 4480
	TABLE*		form,		/* in: information on table
					columns and indexes */
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4481
	const char*	table_name,	/* in: table name */
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4482
	const char*	path_of_temp_table,/* in: if this is a table explicitly
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4483 4484 4485 4486 4487 4488 4489
					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 */
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4490
	ibool		comp)		/* in: TRUE=compact record format */
4491 4492 4493 4494 4495 4496
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
  	int 		error;
  	ulint		col_type;
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4497
	ulint		col_len;
4498 4499
  	ulint		nulls_allowed;
	ulint		unsigned_type;
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4500
	ulint		binary_type;
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4501
	ulint		long_true_varchar;
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heikki@hundin.mysql.fi committed
4502
	ulint		charset_no;
4503
  	ulint		i;
4504

4505 4506 4507
  	DBUG_ENTER("create_table_def");
  	DBUG_PRINT("enter", ("table_name: %s", table_name));

4508
	n_cols = form->s->fields;
4509

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heikki@hundin.mysql.fi committed
4510 4511
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
4512

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4513
	table = dict_mem_table_create(table_name, 0, n_cols, comp);
4514

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4515 4516 4517 4518 4519
	if (path_of_temp_table) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, path_of_temp_table);
	}

4520 4521 4522
	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

4523 4524
		col_type = get_innobase_type_from_mysql_type(&unsigned_type,
									field);
4525 4526 4527 4528 4529 4530
		if (field->null_ptr) {
			nulls_allowed = 0;
		} else {
			nulls_allowed = DATA_NOT_NULL;
		}

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4531
		if (field->binary()) {
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4532 4533 4534 4535 4536
			binary_type = DATA_BINARY_TYPE;
		} else {
			binary_type = 0;
		}

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4537 4538 4539 4540 4541 4542
		charset_no = 0;	

		if (dtype_is_string_type(col_type)) {

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

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4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564
			ut_a(charset_no < 256); /* in data0type.h we assume
						that the number fits in one
						byte */
		}

		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;
			}
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4565 4566
		}

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4567 4568 4569 4570 4571 4572 4573 4574 4575 4576
		dict_mem_table_add_col(table,
					(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,
					0);
4577 4578 4579 4580
	}

	error = row_create_table_for_mysql(table, trx);

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4581
	error = convert_error_code_to_mysql(error, NULL);
4582 4583 4584 4585 4586

	DBUG_RETURN(error);
}

/*********************************************************************
4587
Creates an index in an InnoDB database. */
4588 4589
static
int
4590 4591
create_index(
/*=========*/
4592
	trx_t*		trx,		/* in: InnoDB transaction handle */
4593 4594 4595 4596 4597
	TABLE*		form,		/* in: information on table
					columns and indexes */
	const char*	table_name,	/* in: table name */
	uint		key_num)	/* in: index number */
{
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4598
	Field*		field;
4599
	dict_index_t*	index;
4600
  	int 		error;
4601 4602 4603 4604
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
4605 4606
	ulint		col_type;
	ulint		prefix_len;
4607
	ulint		is_unsigned;
4608
  	ulint		i;
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4609
  	ulint		j;
4610 4611
	ulint*		field_lengths;
	
4612
  	DBUG_ENTER("create_index");
4613

4614 4615 4616
	key = form->key_info + key_num;

    	n_fields = key->key_parts;
4617

4618 4619
    	ind_type = 0;

4620
    	if (key_num == form->s->primary_key) {
4621 4622
		ind_type = ind_type | DICT_CLUSTERED;
	}
4623

4624 4625 4626 4627
	if (key->flags & HA_NOSAME ) {
		ind_type = ind_type | DICT_UNIQUE;
	}

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4628 4629
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
4630 4631 4632

	index = dict_mem_index_create((char*) table_name, key->name, 0,
						ind_type, n_fields);
4633 4634 4635 4636

	field_lengths = (ulint*) my_malloc(sizeof(ulint) * n_fields,
		MYF(MY_FAE));
	
4637 4638 4639
	for (i = 0; i < n_fields; i++) {
		key_part = key->key_part + i;

4640
		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
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4641 4642 4643 4644 4645 4646
		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;
4647
		for (j = 0; j < form->s->fields; j++) {
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4648 4649 4650

			field = form->field[j];

4651 4652 4653
			if (0 == innobase_strcasecmp(
					field->field_name,
					key_part->field->field_name)) {
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4654 4655 4656 4657 4658 4659
				/* Found the corresponding column */

				break;
			}
		}

4660
		ut_a(j < form->s->fields);
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heikki@hundin.mysql.fi committed
4661

4662 4663
		col_type = get_innobase_type_from_mysql_type(
					&is_unsigned, key_part->field);
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4664 4665

		if (DATA_BLOB == col_type
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4666 4667 4668 4669 4670
		    || (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)) {
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4671

4672 4673 4674 4675 4676 4677
		        prefix_len = key_part->length;

			if (col_type == DATA_INT
			    || col_type == DATA_FLOAT
			    || col_type == DATA_DOUBLE
			    || col_type == DATA_DECIMAL) {
4678 4679 4680 4681 4682 4683
			  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);
4684
        
4685 4686 4687 4688
			        prefix_len = 0;
			}
		} else {
		        prefix_len = 0;
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4689 4690
		}

4691 4692
		field_lengths[i] = key_part->length;

4693 4694
		/* We assume all fields should be sorted in ascending
		order, hence the '0': */
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heikki@hundin.mysql.fi committed
4695

4696
		dict_mem_index_add_field(index,
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4697 4698
				(char*) key_part->field->field_name,
				0, prefix_len);
4699 4700
	}

4701
	error = row_create_index_for_mysql(index, trx, field_lengths);
4702

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heikki@hundin.mysql.fi committed
4703
	error = convert_error_code_to_mysql(error, NULL);
4704

4705 4706
	my_free((gptr) field_lengths, MYF(0));
	
4707 4708 4709 4710
	DBUG_RETURN(error);
}

/*********************************************************************
4711
Creates an index to an InnoDB table when the user has defined no
4712
primary index. */
4713 4714
static
int
4715 4716
create_clustered_index_when_no_primary(
/*===================================*/
4717
	trx_t*		trx,		/* in: InnoDB transaction handle */
4718 4719 4720
	const char*	table_name)	/* in: table name */
{
	dict_index_t*	index;
4721 4722
  	int 		error;

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4723 4724
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
4725

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4726 4727 4728
	index = dict_mem_index_create((char*) table_name,
				      (char*) "GEN_CLUST_INDEX",
				      0, DICT_CLUSTERED, 0);
4729
	error = row_create_index_for_mysql(index, trx, NULL);
4730

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4731
	error = convert_error_code_to_mysql(error, NULL);
4732

4733
	return(error);
4734 4735 4736
}

/*********************************************************************
4737
Creates a new table to an InnoDB database. */
4738 4739 4740 4741 4742 4743 4744 4745

int
ha_innobase::create(
/*================*/
					/* out: error number */
	const char*	name,		/* in: table name */
	TABLE*		form,		/* in: information on table
					columns and indexes */
4746 4747 4748
	HA_CREATE_INFO*	create_info)	/* in: more information of the
					created table, contains also the
					create statement string */
4749 4750 4751
{
	int		error;
	dict_table_t*	innobase_table;
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4752
	trx_t*		parent_trx;
4753
	trx_t*		trx;
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4754
	int		primary_key_no;
4755
	uint		i;
4756 4757
	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
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4758
	THD		*thd= current_thd;
4759
	ib_longlong     auto_inc_value;
4760

4761 4762
  	DBUG_ENTER("ha_innobase::create");

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4763
	DBUG_ASSERT(thd != NULL);
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4764

4765
	if (form->s->fields > 1000) {
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4766 4767 4768
		/* The limit probably should be REC_MAX_N_FIELDS - 3 = 1020,
		but we play safe here */

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4769
	        DBUG_RETURN(HA_ERR_TO_BIG_ROW);
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4770 4771
	} 

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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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4775
	parent_trx = check_trx_exists(current_thd);
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	/* 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);	
	
4782
	trx = trx_allocate_for_mysql();
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4783 4784 4785
		
	trx->mysql_thd = thd;
	trx->mysql_query_str = &((*thd).query);
4786

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4787
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
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4788 4789 4790
		trx->check_foreigns = FALSE;
	}

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4791
	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
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heikki@hundin.mysql.fi committed
4792 4793 4794
		trx->check_unique_secondary = FALSE;
	}

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heikki@hundin.mysql.fi committed
4795 4796 4797 4798 4799
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}
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monty@mashka.mysql.fi committed
4800

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heikki@hundin.mysql.fi committed
4801
	fn_format(name2, name, "", "", 2);	// Remove the .frm extension
4802 4803

	normalize_table_name(norm_name, name2);
4804

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heikki@hundin.mysql.fi committed
4805
	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
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heikki@hundin.mysql.fi committed
4806
	or lock waits can happen in it during a table create operation.
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4807
	Drop table etc. do this latching in row0mysql.c. */
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heikki@hundin.mysql.fi committed
4808

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heikki@hundin.mysql.fi committed
4809
	row_mysql_lock_data_dictionary(trx);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4810 4811

	/* Create the table definition in InnoDB */
4812

marko@hundin.mysql.fi's avatar
marko@hundin.mysql.fi committed
4813 4814
	error = create_table_def(trx, form, norm_name,
		create_info->options & HA_LEX_CREATE_TMP_TABLE ? name2 : NULL,
4815
		form->s->row_type != ROW_TYPE_REDUNDANT);
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heikki@hundin.mysql.fi committed
4816

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4817
  	if (error) {
4818
		goto cleanup;
4819 4820
 	}

4821 4822
	/* Look for a primary key */

4823 4824
	primary_key_no= (form->s->primary_key != MAX_KEY ?
			 (int) form->s->primary_key : 
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monty@hundin.mysql.fi committed
4825
			 -1);
4826

4827 4828 4829
	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4830
	DBUG_ASSERT(primary_key_no == -1 || primary_key_no == 0);
4831

4832 4833
	/* Create the keys */

4834
	if (form->s->keys == 0 || primary_key_no == -1) {
4835 4836
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
4837
		by InnoDB */
4838

4839
		error = create_clustered_index_when_no_primary(trx,
4840
							norm_name);
4841
  		if (error) {
4842
			goto cleanup;
4843
      		}
4844 4845 4846
	}

	if (primary_key_no != -1) {
4847
		/* In InnoDB the clustered index must always be created
4848
		first */
monty@donna.mysql.fi's avatar
monty@donna.mysql.fi committed
4849 4850
	    	if ((error = create_index(trx, form, norm_name,
					  (uint) primary_key_no))) {
4851
			goto cleanup;
4852 4853 4854
      		}
      	}

4855
	for (i = 0; i < form->s->keys; i++) {
4856 4857 4858

		if (i != (uint) primary_key_no) {

monty@donna.mysql.fi's avatar
monty@donna.mysql.fi committed
4859
    			if ((error = create_index(trx, form, norm_name, i))) {
4860
				goto cleanup;
4861
      			}
4862
      		}
4863
  	}
4864

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4865
	if (current_thd->query != NULL) {
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marko@hundin.mysql.fi committed
4866
		LEX_STRING q;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4867

marko@hundin.mysql.fi's avatar
marko@hundin.mysql.fi committed
4868 4869 4870 4871 4872
		if (thd->convert_string(&q, system_charset_info,
					current_thd->query,
					current_thd->query_length,
					current_thd->charset())) {
			error = HA_ERR_OUT_OF_MEM;
4873 4874
			
			goto cleanup;
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marko@hundin.mysql.fi committed
4875
		}
4876

4877 4878 4879
		error = row_table_add_foreign_constraints(trx,
			q.str, norm_name,
			create_info->options & HA_LEX_CREATE_TMP_TABLE);
4880

4881
		error = convert_error_code_to_mysql(error, NULL);
4882

4883 4884
		if (error) {
			goto cleanup;
4885
		}
4886 4887
	}

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4888 4889
  	innobase_commit_low(trx);

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heikki@hundin.mysql.fi committed
4890
	row_mysql_unlock_data_dictionary(trx);
4891

monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
4892 4893 4894
	/* 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 */
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4895

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4896
	log_buffer_flush_to_disk();
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
4897

4898
	innobase_table = dict_table_get(norm_name, NULL);
4899

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4900
	DBUG_ASSERT(innobase_table != 0);
4901

4902 4903
	if ((create_info->used_fields & HA_CREATE_USED_AUTO) &&
	   (create_info->auto_increment_value != 0)) {
4904

4905 4906
		/* Query was ALTER TABLE...AUTO_INCREMENT = x; or 
		CREATE TABLE ...AUTO_INCREMENT = x; Find out a table
4907 4908
		definition from the dictionary and get the current value
		of the auto increment field. Set a new value to the
4909 4910
		auto increment field if the value is greater than the
		maximum value in the column. */
4911

4912
		auto_inc_value = create_info->auto_increment_value;
4913 4914 4915
		dict_table_autoinc_initialize(innobase_table, auto_inc_value);
	}

4916
	/* Tell the InnoDB server that there might be work for
4917 4918 4919 4920 4921 4922 4923
	utility threads: */

	srv_active_wake_master_thread();

  	trx_free_for_mysql(trx);

	DBUG_RETURN(0);
4924 4925 4926 4927 4928 4929 4930 4931 4932

cleanup:
	innobase_commit_low(trx);
	
	row_mysql_unlock_data_dictionary(trx);
	
	trx_free_for_mysql(trx);

	DBUG_RETURN(error);
4933 4934
}

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heikki@hundin.mysql.fi committed
4935 4936 4937 4938 4939 4940 4941 4942 4943 4944
/*********************************************************************
Discards or imports an InnoDB tablespace. */

int
ha_innobase::discard_or_import_tablespace(
/*======================================*/
				/* out: 0 == success, -1 == error */
	my_bool discard)	/* in: TRUE if discard, else import */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
4945
	dict_table_t*	dict_table;
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4946 4947 4948 4949 4950 4951 4952
	trx_t*		trx;
	int		err;

 	DBUG_ENTER("ha_innobase::discard_or_import_tablespace");

	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(prebuilt->trx ==
4953
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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4954

4955
	dict_table = prebuilt->table;
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heikki@hundin.mysql.fi committed
4956 4957 4958
	trx = prebuilt->trx;

	if (discard) {
4959
		err = row_discard_tablespace_for_mysql(dict_table->name, trx);
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heikki@hundin.mysql.fi committed
4960
	} else {
4961
		err = row_import_tablespace_for_mysql(dict_table->name, trx);
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heikki@hundin.mysql.fi committed
4962 4963
	}

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4964
	err = convert_error_code_to_mysql(err, NULL);
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heikki@hundin.mysql.fi committed
4965

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heikki@hundin.mysql.fi committed
4966
	DBUG_RETURN(err);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
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
/*********************************************************************
Deletes all rows of an InnoDB table. */

int
ha_innobase::delete_all_rows(void)
/*==============================*/
				/* out: error number */
{
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
	int		error;
	trx_t*		trx;
	THD*		thd		= current_thd;

	DBUG_ENTER("ha_innobase::delete_all_rows");

	if (thd->lex->sql_command != SQLCOM_TRUNCATE) {
	fallback:
		/* We only handle TRUNCATE TABLE t as a special case.
		DELETE FROM t will have to use ha_innobase::delete_row(). */
		DBUG_RETURN(my_errno=HA_ERR_WRONG_COMMAND);
	}

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

	trx = check_trx_exists(thd);

	/* Truncate the table in InnoDB */

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

	error = convert_error_code_to_mysql(error, NULL);

	DBUG_RETURN(error);
}

5009
/*********************************************************************
5010
Drops a table from an InnoDB database. Before calling this function,
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monty@donna.mysql.com committed
5011 5012
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
5013 5014
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB. */
5015 5016 5017 5018

int
ha_innobase::delete_table(
/*======================*/
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monty@donna.mysql.com committed
5019 5020
				/* out: error number */
	const char*	name)	/* in: table name */
5021 5022 5023
{
	ulint	name_len;
	int	error;
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heikki@hundin.mysql.fi committed
5024
	trx_t*	parent_trx;
5025
	trx_t*	trx;
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heikki@hundin.mysql.fi committed
5026
	THD     *thd= current_thd;
5027
	char	norm_name[1000];
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heikki@hundin.mysql.fi committed
5028

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heikki@hundin.mysql.fi committed
5029
 	DBUG_ENTER("ha_innobase::delete_table");
5030

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heikki@hundin.mysql.fi committed
5031 5032 5033
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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heikki@hundin.mysql.fi committed
5034
	parent_trx = check_trx_exists(current_thd);
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heikki@hundin.mysql.fi committed
5035 5036 5037 5038 5039 5040

	/* 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);	

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heikki@hundin.mysql.fi committed
5041 5042 5043 5044 5045 5046
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

5047 5048
	trx = trx_allocate_for_mysql();

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5049 5050
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5051

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heikki@hundin.mysql.fi committed
5052 5053 5054 5055 5056 5057 5058 5059
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	}

5060 5061 5062
	name_len = strlen(name);

	assert(name_len < 1000);
5063

5064 5065
	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
5066

5067 5068
	normalize_table_name(norm_name, name);

5069
  	/* Drop the table in InnoDB */
5070

5071
	error = row_drop_table_for_mysql(norm_name, trx,
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monty@mishka.local committed
5072
		thd->lex->sql_command == SQLCOM_DROP_DB);
5073

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Merge  
monty@donna.mysql.fi committed
5074 5075 5076
	/* 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 */
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5077

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5078
	log_buffer_flush_to_disk();
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
5079

5080
	/* Tell the InnoDB server that there might be work for
5081 5082 5083 5084
	utility threads: */

	srv_active_wake_master_thread();

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5085
  	innobase_commit_low(trx);
heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
5086

5087 5088
  	trx_free_for_mysql(trx);

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heikki@hundin.mysql.fi committed
5089
	error = convert_error_code_to_mysql(error, NULL);
5090 5091 5092 5093

	DBUG_RETURN(error);
}

5094 5095 5096
/*********************************************************************
Removes all tables in the named database inside InnoDB. */

5097
void
5098 5099 5100 5101 5102 5103 5104 5105 5106
innobase_drop_database(
/*===================*/
			/* out: error number */
	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;
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heikki@hundin.mysql.fi committed
5107
	trx_t*	parent_trx;
5108 5109 5110
	trx_t*	trx;
	char*	ptr;
	int	error;
5111
	char*	namebuf;
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monty@hundin.mysql.fi committed
5112

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heikki@hundin.mysql.fi committed
5113 5114 5115
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5116
	parent_trx = check_trx_exists(current_thd);
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heikki@hundin.mysql.fi committed
5117 5118 5119 5120 5121 5122

	/* 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);	

5123
	ptr = strend(path) - 2;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5124

5125 5126 5127 5128 5129 5130
	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5131
	namebuf = my_malloc((uint) len + 2, MYF(0));
5132 5133 5134 5135

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5136
#ifdef  __WIN__
5137
	innobase_casedn_str(namebuf);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5138
#endif
5139
	trx = trx_allocate_for_mysql();
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5140 5141
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
5142

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5143 5144 5145 5146
	if (current_thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

5147
  	error = row_drop_database_for_mysql(namebuf, trx);
5148
	my_free(namebuf, MYF(0));
5149

monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
5150 5151 5152
	/* 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 */
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5153

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5154
	log_buffer_flush_to_disk();
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
5155

5156 5157 5158 5159 5160
	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5161
  	innobase_commit_low(trx);
5162
  	trx_free_for_mysql(trx);
5163
#ifdef NO_LONGER_INTERESTED_IN_DROP_DB_ERROR 
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heikki@hundin.mysql.fi committed
5164
	error = convert_error_code_to_mysql(error, NULL);
5165 5166

	return(error);
5167 5168 5169
#else
	return;
#endif
5170 5171
}

5172
/*************************************************************************
5173
Renames an InnoDB table. */
5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184

int
ha_innobase::rename_table(
/*======================*/
				/* out: 0 or error code */
	const char*	from,	/* in: old name of the table */
	const char*	to)	/* in: new name of the table */
{
	ulint	name_len1;
	ulint	name_len2;
	int	error;
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heikki@hundin.mysql.fi committed
5185
	trx_t*	parent_trx;
5186
	trx_t*	trx;
5187 5188
	char	norm_from[1000];
	char	norm_to[1000];
5189

5190 5191
  	DBUG_ENTER("ha_innobase::rename_table");

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5192 5193 5194
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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heikki@hundin.mysql.fi committed
5195
	parent_trx = check_trx_exists(current_thd);
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heikki@hundin.mysql.fi committed
5196 5197 5198 5199 5200 5201

	/* 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);	

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heikki@hundin.mysql.fi committed
5202 5203 5204 5205 5206 5207
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

5208
	trx = trx_allocate_for_mysql();
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heikki@hundin.mysql.fi committed
5209 5210
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
5211

5212 5213 5214 5215
	if (current_thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

5216 5217 5218 5219 5220
	name_len1 = strlen(from);
	name_len2 = strlen(to);

	assert(name_len1 < 1000);
	assert(name_len2 < 1000);
5221

5222 5223 5224
	normalize_table_name(norm_from, from);
	normalize_table_name(norm_to, to);

5225
  	/* Rename the table in InnoDB */
5226

5227
  	error = row_rename_table_for_mysql(norm_from, norm_to, trx);
5228

monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
5229 5230 5231
	/* 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 */
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5232

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5233
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
5234

5235
	/* Tell the InnoDB server that there might be work for
5236 5237 5238 5239
	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
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  	trx_free_for_mysql(trx);

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

/*************************************************************************
Estimates the number of index records in a range. */

ha_rows
ha_innobase::records_in_range(
/*==========================*/
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						/* out: estimated number of
						rows */
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	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 */
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{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key;
	dict_index_t*	index;
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	mysql_byte*	key_val_buff2 	= (mysql_byte*) my_malloc(
5266
						  table->s->reclength
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      					+ table->s->max_key_length + 100,
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								MYF(MY_FAE));
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	ulint		buff2_len = table->s->reclength
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      					+ table->s->max_key_length + 100;
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	dtuple_t*	range_start;
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	dtuple_t*	range_end;
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	ib_longlong	n_rows;
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	ulint		mode1;
	ulint		mode2;
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	void*           heap1;
	void*           heap2;
5278

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   	DBUG_ENTER("records_in_range");
5280

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	prebuilt->trx->op_info = (char*)"estimating records in index range";

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	/* 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);
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	active_index = keynr;

	key = table->key_info + active_index;
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	index = dict_table_get_index_noninline(prebuilt->table, key->name);
5293

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	range_start = dtuple_create_for_mysql(&heap1, key->key_parts);
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 	dict_index_copy_types(range_start, index, key->key_parts);
5296

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	range_end = dtuple_create_for_mysql(&heap2, key->key_parts);
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 	dict_index_copy_types(range_end, index, key->key_parts);
5299

5300
	row_sel_convert_mysql_key_to_innobase(
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				range_start, (byte*) key_val_buff,
				(ulint)upd_and_key_val_buff_len,
				index,
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				(byte*) (min_key ? min_key->key :
                                         (const mysql_byte*) 0),
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				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);
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	row_sel_convert_mysql_key_to_innobase(
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				range_end, (byte*) key_val_buff2,
				buff2_len, index,
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				(byte*) (max_key ? max_key->key :
                                         (const mysql_byte*) 0),
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				(ulint) (max_key ? max_key->length : 0),
				prebuilt->trx);
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	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);
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	n_rows = btr_estimate_n_rows_in_range(index, range_start,
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						mode1, range_end, mode2);
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	dtuple_free_for_mysql(heap1);
	dtuple_free_for_mysql(heap2);
5326

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    	my_free((gptr) key_val_buff2, MYF(0));
5328

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	prebuilt->trx->op_info = (char*)"";

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	/* 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;
	}

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	DBUG_RETURN((ha_rows) n_rows);
}

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/*************************************************************************
Gives an UPPER BOUND to the number of rows in a table. This is used in
5346
filesort.cc. */
5347 5348

ha_rows
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ha_innobase::estimate_rows_upper_bound(void)
5350
/*======================================*/
5351
			/* out: upper bound of rows */
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{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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	dict_index_t*	index;
	ulonglong	estimate;
5356
	ulonglong	local_data_file_length;
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 	DBUG_ENTER("estimate_rows_upper_bound");
5359

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	/* 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(current_thd);

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	prebuilt->trx->op_info = (char*)
	                         "calculating upper bound for table rows";

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	/* 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);
5373

5374
	index = dict_table_get_first_index_noninline(prebuilt->table);
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5376
	local_data_file_length = ((ulonglong) index->stat_n_leaf_pages)
5377
    							* UNIV_PAGE_SIZE;
5378

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	/* Calculate a minimum length for a clustered index record and from
	that an upper bound for the number of rows. Since we only calculate
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	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. */
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	estimate = 2 * local_data_file_length /
					 dict_index_calc_min_rec_len(index);
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	prebuilt->trx->op_info = (char*)"";

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	DBUG_RETURN((ha_rows) estimate);
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}

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/*************************************************************************
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. */

double
ha_innobase::scan_time()
/*====================*/
			/* out: estimated time measured in disk seeks */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	/* 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));
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}

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/**********************************************************************
Calculate the time it takes to read a set of ranges through an index
This enables us to optimise reads for clustered indexes. */
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double
ha_innobase::read_time(
/*===================*/
			/* out: estimated time measured in disk seeks */
	uint    index,	/* in: key number */
	uint	ranges,	/* in: how many ranges */
	ha_rows rows)	/* in: estimated number of rows in the ranges */
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{
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	ha_rows total_rows;
	double  time_for_scan;
  
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	if (index != table->s->primary_key) {
		/* Not clustered */		
	  	return(handler::read_time(index, ranges, rows));
	}
5431

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	if (rows <= 2) {
5433

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		return((double) rows);
	}
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	/* Assume that the read time is proportional to the scan time for all
	rows + at most one seek per range. */

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	time_for_scan = scan_time();
5441

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	if ((total_rows = estimate_rows_upper_bound()) < rows) {
5443

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	  	return(time_for_scan);
	}
5446

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	return(ranges + (double) rows / (double) total_rows * time_for_scan);
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}

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/*************************************************************************
Returns statistics information of the table to the MySQL interpreter,
in various fields of the handle object. */

void
ha_innobase::info(
/*==============*/
	uint flag)	/* in: what information MySQL requests */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	dict_table_t*	ib_table;
	dict_index_t*	index;
5462
	ha_rows		rec_per_key;
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	ib_longlong	n_rows;
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	ulong		j;
	ulong		i;
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	char		path[FN_REFLEN];
	os_file_stat_t  stat_info;
5468

5469 5470
 	DBUG_ENTER("info");

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        /* 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) {

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                DBUG_VOID_RETURN;
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        }

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	/* 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(current_thd);

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

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	prebuilt->trx->op_info = (char*)"returning various info to MySQL";

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	trx_search_latch_release_if_reserved(prebuilt->trx);
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 	ib_table = prebuilt->table;

 	if (flag & HA_STATUS_TIME) {
 		/* In sql_show we call with this flag: update then statistics
 		so that they are up-to-date */

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	        prebuilt->trx->op_info = (char*)"updating table statistics";

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 		dict_update_statistics(ib_table);
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		prebuilt->trx->op_info = (char*)
		                          "returning various info to MySQL";
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		if (ib_table->space != 0) {
			my_snprintf(path, sizeof(path), "%s/%s%s",
				    mysql_data_home, ib_table->name,
				    ".ibd");
			unpack_filename(path,path);
		} else {
			my_snprintf(path, sizeof(path), "%s/%s%s", 
				    mysql_data_home, ib_table->name,
				    reg_ext);
		
			unpack_filename(path,path);
		}

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		/* Note that we do not know the access time of the table, 
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

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		if (os_file_get_status(path,&stat_info)) {
			create_time = stat_info.ctime;
		}
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 	}

	if (flag & HA_STATUS_VARIABLE) {
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		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
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		HA_STATUS_TIME flag set, while the left join optimizer does not
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		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++;
		}

    		records = (ha_rows)n_rows;
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    		deleted = 0;
    		data_file_length = ((ulonglong)
				ib_table->stat_clustered_index_size)
    					* UNIV_PAGE_SIZE;
    		index_file_length = ((ulonglong)
				ib_table->stat_sum_of_other_index_sizes)
    					* UNIV_PAGE_SIZE;
    		delete_length = 0;
    		check_time = 0;

    		if (records == 0) {
    			mean_rec_length = 0;
    		} else {
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    			mean_rec_length = (ulong) (data_file_length / records);
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    		}
    	}

	if (flag & HA_STATUS_CONST) {
		index = dict_table_get_first_index_noninline(ib_table);

		if (prebuilt->clust_index_was_generated) {
			index = dict_table_get_next_index_noninline(index);
		}
5575

5576
		for (i = 0; i < table->s->keys; i++) {
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			if (index == NULL) {
				ut_print_timestamp(stderr);
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				sql_print_error("Table %s contains less "
						"indexes inside InnoDB than "
						"are defined in the MySQL "
						".frm file. Have you mixed up "
						".frm files from different "
						"installations? See section "
						"15.1 at http://www.innodb.com/ibman.html",
						ib_table->name);
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				break;
			}

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			for (j = 0; j < table->key_info[i].key_parts; j++) {

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				if (j + 1 > index->n_uniq) {
				        ut_print_timestamp(stderr);
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					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 "
							"section 15.1 at "
							"http://www.innodb.com/ibman.html",
							index->name,
							ib_table->name,
							(unsigned long)
							index->n_uniq, j + 1);
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				        break;
				}

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				if (index->stat_n_diff_key_vals[j + 1] == 0) {

					rec_per_key = records;
				} else {
5616
					rec_per_key = (ha_rows)(records /
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   				         index->stat_n_diff_key_vals[j + 1]);
				}

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				/* 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;

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				if (rec_per_key == 0) {
					rec_per_key = 1;
				}
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 				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  rec_per_key;
5634
			}
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			index = dict_table_get_next_index_noninline(index);
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		}
	}
5639 5640

  	if (flag & HA_STATUS_ERRKEY) {
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		ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);

5643
		errkey = (unsigned int) row_get_mysql_key_number_for_index(
5644 5645
				       (dict_index_t*)
				       trx_get_error_info(prebuilt->trx));
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  	}

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	if (flag & HA_STATUS_AUTO && table->found_next_number_field) {
		longlong	auto_inc;
		int		ret;

		/* The following function call can the first time fail in
		a lock wait timeout error because it reserves the auto-inc
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		lock on the table. If it fails, then someone is already initing
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		the auto-inc counter, and the second call is guaranteed to
		succeed. */

		ret = innobase_read_and_init_auto_inc(&auto_inc); 

		if (ret != 0) {
			ret = innobase_read_and_init_auto_inc(&auto_inc);

			if (ret != 0) {
				ut_print_timestamp(stderr);
				sql_print_error("Cannot get table %s auto-inc"
						"counter value in ::info\n",
						ib_table->name);
				auto_inc = 0;
			}
		}
		
		auto_increment_value = auto_inc;
	}

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	prebuilt->trx->op_info = (char*)"";

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  	DBUG_VOID_RETURN;
}

5680
/**************************************************************************
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Updates index cardinalities of the table, based on 8 random dives into
each index tree. This does NOT calculate exact statistics on the table. */
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int
ha_innobase::analyze(
/*=================*/			 
					/* out: returns always 0 (success) */
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
{
	/* Simply call ::info() with all the flags */
	info(HA_STATUS_TIME | HA_STATUS_CONST | HA_STATUS_VARIABLE);

	return(0);
}

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/**************************************************************************
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This is mapped to "ALTER TABLE tablename TYPE=InnoDB", which rebuilds
the table in MySQL. */
5700

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int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
5706
{
5707
        return(HA_ADMIN_TRY_ALTER);
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}

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/***********************************************************************
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. */

int
ha_innobase::check(
/*===============*/
					/* out: HA_ADMIN_CORRUPT or
					HA_ADMIN_OK */
	THD* 		thd,		/* in: user thread handle */
	HA_CHECK_OPT* 	check_opt)	/* in: check options, currently
					ignored */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
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	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
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	ut_a(prebuilt->trx ==
5729
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	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);

	if (ret == DB_SUCCESS) {
		return(HA_ADMIN_OK);
	}
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  	return(HA_ADMIN_CORRUPT); 
}

5747
/*****************************************************************
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Merge  
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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. */
5751 5752 5753 5754

char*
ha_innobase::update_table_comment(
/*==============================*/
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				/* out: table comment + InnoDB free space +
				info on foreign keys */
        const char*	comment)/* in: table comment defined by user */
5758
{
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	uint	length			= (uint) strlen(comment);
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	char*				str;
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
5762

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	/* 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. */

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5767
	if (length > 64000 - 3) {
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		return((char*)comment); /* string too long */
	}

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	update_thd(current_thd);

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	prebuilt->trx->op_info = (char*)"returning table comment";

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	/* 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);
5779
	str = NULL;
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5780

5781
	if (FILE* file = os_file_create_tmpfile()) {
5782
		long	flen;
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5784 5785
		/* output the data to a temporary file */
		fprintf(file, "InnoDB free: %lu kB",
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      		   (ulong) fsp_get_available_space_in_free_extents(
      					prebuilt->table->space));
5788

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		dict_print_info_on_foreign_keys(FALSE, file,
				prebuilt->trx, prebuilt->table);
5791
		flen = ftell(file);
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		if (flen < 0) {
			flen = 0;
		} else if (length + flen + 3 > 64000) {
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			flen = 64000 - 3 - length;
		}
5797

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		/* allocate buffer for the full string, and
		read the contents of the temporary file */
5800

5801
		str = my_malloc(length + flen + 3, MYF(0));
5802

5803 5804
		if (str) {
			char* pos	= str + length;
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			if (length) {
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				memcpy(str, comment, length);
				*pos++ = ';';
				*pos++ = ' ';
			}
			rewind(file);
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			flen = (uint) fread(pos, 1, flen, file);
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			pos[flen] = 0;
		}

		fclose(file);
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	}
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        prebuilt->trx->op_info = (char*)"";

5820
  	return(str ? str : (char*) comment);
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}

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/***********************************************************************
Gets the foreign key create info for a table stored in InnoDB. */

char*
ha_innobase::get_foreign_key_create_info(void)
/*==========================================*/
			/* out, own: character string in the form which
			can be inserted to the CREATE TABLE statement,
			MUST be freed with ::free_foreign_key_create_info */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
5834
	char*	str	= 0;
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	ut_a(prebuilt != NULL);
5837

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	/* 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(current_thd);

5844
	if (FILE* file = os_file_create_tmpfile()) {
5845
		long	flen;
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5847
		prebuilt->trx->op_info = (char*)"getting info on foreign keys";
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5848

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		/* In case MySQL calls this in the middle of a SELECT query,
		release possible adaptive hash latch to avoid
		deadlocks of threads */
5852

5853
		trx_search_latch_release_if_reserved(prebuilt->trx);
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5854

5855
		/* output the data to a temporary file */
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		dict_print_info_on_foreign_keys(TRUE, file,
				prebuilt->trx, prebuilt->table);
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		prebuilt->trx->op_info = (char*)"";

		flen = ftell(file);
5861 5862
		if (flen < 0) {
			flen = 0;
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5863
		} else if (flen > 64000 - 1) {
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			flen = 64000 - 1;
		}

		/* allocate buffer for the string, and
		read the contents of the temporary file */

		str = my_malloc(flen + 1, MYF(0));

		if (str) {
			rewind(file);
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			flen = (uint) fread(str, 1, flen, file);
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			str[flen] = 0;
		}

		fclose(file);
	} else {
		/* unable to create temporary file */
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          	str = my_strdup(
"/* Error: cannot display foreign key constraints */", MYF(0));
5883
	}
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  	return(str);
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}
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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");
  row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
  ut_a(prebuilt != NULL);
  update_thd(current_thd);
  prebuilt->trx->op_info = (char*)"getting list of foreign keys";
  trx_search_latch_release_if_reserved(prebuilt->trx);
5900
  mutex_enter_noninline(&(dict_sys->mutex));
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  foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);

  while (foreign != NULL) 
  {
    uint i;
    FOREIGN_KEY_INFO f_key_info;
    LEX_STRING *name= 0;
    const char *tmp_buff;

    tmp_buff= foreign->id;
    i= 0;
    while (tmp_buff[i] != '/')
      i++;
    tmp_buff+= i + 1;
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    f_key_info.forein_id= make_lex_string(thd, 0, tmp_buff,
                                          (uint) strlen(tmp_buff), 1);
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    tmp_buff= foreign->referenced_table_name;
    i= 0;
    while (tmp_buff[i] != '/')
      i++;
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    f_key_info.referenced_db= make_lex_string(thd, 0,
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                                              tmp_buff, i, 1);
    tmp_buff+= i + 1;
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    f_key_info.referenced_table= make_lex_string(thd, 0, tmp_buff, 
                                               (uint) strlen(tmp_buff), 1);
5926 5927 5928 5929

    for (i= 0;;)
    {
      tmp_buff= foreign->foreign_col_names[i];
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      name= make_lex_string(thd, name, tmp_buff, (uint) strlen(tmp_buff), 1);
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      f_key_info.foreign_fields.push_back(name);
      tmp_buff= foreign->referenced_col_names[i];
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      name= make_lex_string(thd, name, tmp_buff, (uint) strlen(tmp_buff), 1);
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      f_key_info.referenced_fields.push_back(name);
      if (++i >= foreign->n_fields)
        break;
    }

    ulong length= 0;
    if (foreign->type == DICT_FOREIGN_ON_DELETE_CASCADE)
    {
      length=17;
      tmp_buff= "ON DELETE CASCADE";
    }	
    else if (foreign->type == DICT_FOREIGN_ON_DELETE_SET_NULL)
    {
      length=18;
      tmp_buff= "ON DELETE SET NULL";
    }
    else if (foreign->type == DICT_FOREIGN_ON_DELETE_NO_ACTION)
    {
      length=19;
      tmp_buff= "ON DELETE NO ACTION";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_CASCADE)
    {
      length=17;
      tmp_buff= "ON UPDATE CASCADE";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_SET_NULL)
    {
      length=18;
      tmp_buff= "ON UPDATE SET NULL";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_NO_ACTION)
    {
      length=19;
      tmp_buff= "ON UPDATE NO ACTION";
    }
    f_key_info.constraint_method= make_lex_string(thd,
                                                  f_key_info.constraint_method,
                                                  tmp_buff, length, 1);

    FOREIGN_KEY_INFO *pf_key_info= ((FOREIGN_KEY_INFO *) 
                                    thd->memdup((gptr) &f_key_info,
                                                sizeof(FOREIGN_KEY_INFO)));
    f_key_list->push_back(pf_key_info);
    foreign = UT_LIST_GET_NEXT(foreign_list, foreign);
  }
5980
  mutex_exit_noninline(&(dict_sys->mutex));
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  prebuilt->trx->op_info = (char*)"";
  DBUG_RETURN(0);
}

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/*********************************************************************
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). */

bool
ha_innobase::can_switch_engines(void)
/*=================================*/
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	bool	can_switch;

 	DBUG_ENTER("ha_innobase::can_switch_engines");
	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);
}

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/***********************************************************************
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. */

uint
ha_innobase::referenced_by_foreign_key(void)
/*========================================*/
			/* out: > 0 if referenced by a FOREIGN KEY */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;

	if (dict_table_referenced_by_foreign_key(prebuilt->table)) {

		return(1);
	}

	return(0);
}
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/***********************************************************************
Frees the foreign key create info for a table stored in InnoDB, if it is
non-NULL. */

void
ha_innobase::free_foreign_key_create_info(
/*======================================*/
	char*	str)	/* in, own: create info string to free  */
{
	if (str) {
6042
		my_free(str, MYF(0));
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	}
6044 6045
}

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/***********************************************************************
Tells something additional to the handler about how to do things. */

int
ha_innobase::extra(
/*===============*/
			   /* out: 0 or error number */
	enum ha_extra_function operation)
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                           /* in: HA_EXTRA_RETRIEVE_ALL_COLS or some
			   other flag */
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{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	/* 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) {
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                case HA_EXTRA_FLUSH:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
                        break;
                case HA_EXTRA_RESET:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
6073
                        prebuilt->keep_other_fields_on_keyread = 0;
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                        prebuilt->read_just_key = 0;
                        break;
  		case HA_EXTRA_RESET_STATE:
6077
	        	prebuilt->keep_other_fields_on_keyread = 0;
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	        	prebuilt->read_just_key = 0;
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    	        	break;
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		case HA_EXTRA_NO_KEYREAD:
    			prebuilt->read_just_key = 0;
    			break;
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	        case HA_EXTRA_RETRIEVE_ALL_COLS:
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			prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_ALL_COLS;
			break;
	        case HA_EXTRA_RETRIEVE_PRIMARY_KEY:
			if (prebuilt->hint_need_to_fetch_extra_cols == 0) {
				prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_PRIMARY_KEY;
			}
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			break;
	        case HA_EXTRA_KEYREAD:
	        	prebuilt->read_just_key = 1;
	        	break;
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		case HA_EXTRA_KEYREAD_PRESERVE_FIELDS:
			prebuilt->keep_other_fields_on_keyread = 1;
			break;
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		default:/* Do nothing */
			;
	}

	return(0);
}

6106
/**********************************************************************
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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
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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 is true in ::store_lock()) before executing the
procedure. */
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int
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ha_innobase::start_stmt(
/*====================*/
6121
	              /* out: 0 or error code */
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	THD*    thd,  /* in: handle to the user thread */
        thr_lock_type lock_type)
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{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

	update_thd(thd);

	trx = prebuilt->trx;

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	/* 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. */

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	innobase_release_stat_resources(trx);

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	if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
6142
	    					&& trx->global_read_view) {
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	    	/* At low transaction isolation levels we let
		each consistent read set its own snapshot */

	    	read_view_close_for_mysql(trx);
	}

6149
	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
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	prebuilt->read_just_key = 0;
6152
        prebuilt->keep_other_fields_on_keyread = FALSE;
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6154
	if (!prebuilt->mysql_has_locked) {
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	        /* 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;
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	} else {
		if (trx->isolation_level != TRX_ISO_SERIALIZABLE
		    && thd->lex->sql_command == SQLCOM_SELECT
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		    && lock_type == TL_READ) {
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			/* 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(),
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			2) ::external_lock(), 
			3) ::init_table_handle_for_HANDLER(), and 
			4) :.transactional_table_lock(). */
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			prebuilt->select_lock_type =
				prebuilt->stored_select_lock_type;
		}

		if (prebuilt->stored_select_lock_type != LOCK_S
		    && prebuilt->stored_select_lock_type != LOCK_X) {
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		  sql_print_error("stored_select_lock_type is %lu inside "
				  "::start_stmt()!",
				  prebuilt->stored_select_lock_type);
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			/* Set the value to LOCK_X: this is just fault
			tolerance, we do not know what the correct value
			should be! */

			prebuilt->select_lock_type = LOCK_X;
		}
	}

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	trx->detailed_error[0] = '\0';

6199
	/* Set the MySQL flag to mark that there is an active transaction */
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        if (trx->active_trans == 0) {

6202
                innobase_register_trx_and_stmt(thd);
6203
                trx->active_trans = 1;
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        } else {
		innobase_register_stmt(thd);
	}
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	return(0);
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}

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/**********************************************************************
Maps a MySQL trx isolation level code to the InnoDB isolation level code */
inline
ulint
innobase_map_isolation_level(
/*=========================*/
					/* out: InnoDB isolation level */
	enum_tx_isolation	iso)	/* in: MySQL isolation level code */
{
	switch(iso) {
		case ISO_REPEATABLE_READ: return(TRX_ISO_REPEATABLE_READ);
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		case ISO_READ_COMMITTED: return(TRX_ISO_READ_COMMITTED);
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		case ISO_SERIALIZABLE: return(TRX_ISO_SERIALIZABLE);
		case ISO_READ_UNCOMMITTED: return(TRX_ISO_READ_UNCOMMITTED);
		default: ut_a(0); return(0);
	}	
}
	
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/**********************************************************************
As MySQL will execute an external lock for every new table it uses when it
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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
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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. */

int
ha_innobase::external_lock(
/*=======================*/
6241
			        /* out: 0 */
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	THD*	thd,		/* in: handle to the user thread */
	int 	lock_type)	/* in: lock type */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

  	DBUG_ENTER("ha_innobase::external_lock");
6249
	DBUG_PRINT("enter",("lock_type: %d", lock_type));
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	update_thd(thd);

	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
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	prebuilt->read_just_key = 0;
6259
	prebuilt->keep_other_fields_on_keyread = FALSE;
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	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;
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		prebuilt->stored_select_lock_type = LOCK_X;
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	}

	if (lock_type != F_UNLCK) {
6270
		/* MySQL is setting a new table lock */
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		trx->detailed_error[0] = '\0';
		
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		/* Set the MySQL flag to mark that there is an active
		transaction */
6276 6277
                if (trx->active_trans == 0) {

6278
                        innobase_register_trx_and_stmt(thd);
6279
                        trx->active_trans = 1;
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                } else if (trx->n_mysql_tables_in_use == 0) {
			innobase_register_stmt(thd);
		}
6283

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		trx->n_mysql_tables_in_use++;
6285
		prebuilt->mysql_has_locked = TRUE;
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		if (trx->n_mysql_tables_in_use == 1) {
		        trx->isolation_level = innobase_map_isolation_level(
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						(enum_tx_isolation)
						thd->variables.tx_isolation);
6291
		}
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		if (trx->isolation_level == TRX_ISO_SERIALIZABLE
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		    && prebuilt->select_lock_type == LOCK_NONE
		    && (thd->options
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				& (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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			/* To get serializable execution, we let InnoDB
			conceptually add 'LOCK IN SHARE MODE' to all SELECTs
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			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. */
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			prebuilt->select_lock_type = LOCK_S;
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			prebuilt->stored_select_lock_type = LOCK_S;
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		}

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		/* 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
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		VERY easily deadlocks. We do not set InnoDB table locks when
		MySQL sets them at the start of a stored procedure call
		(MySQL does have thd->in_lock_tables TRUE there). */
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		if (prebuilt->select_lock_type != LOCK_NONE) {
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6320
			if (thd->in_lock_tables &&
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			    thd->lex->sql_command != SQLCOM_CALL &&
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			    thd->variables.innodb_table_locks &&
			    (thd->options & OPTION_NOT_AUTOCOMMIT)) {
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6325
				ulint	error;
6326
				error = row_lock_table_for_mysql(prebuilt,
6327
							NULL, 0);
6328 6329 6330

				if (error != DB_SUCCESS) {
					error = convert_error_code_to_mysql(
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6331 6332
						(int) error, user_thd);
					DBUG_RETURN((int) error);
6333 6334
				}
			}
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		  	trx->mysql_n_tables_locked++;
		}

6339
		DBUG_RETURN(0);
6340
	}
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6342
	/* MySQL is releasing a table lock */
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	trx->n_mysql_tables_in_use--;
	prebuilt->mysql_has_locked = FALSE;
6346

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	/* If the MySQL lock count drops to zero we know that the current SQL
	statement has ended */
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6350
	if (trx->n_mysql_tables_in_use == 0) {
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	        trx->mysql_n_tables_locked = 0;
		prebuilt->used_in_HANDLER = FALSE;
			
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		/* 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. */

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		innobase_release_stat_resources(trx);
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		if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
6362 6363
                        if (trx->active_trans != 0) {
                                innobase_commit(thd, TRUE);
6364 6365
			}
		} else {
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			if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
6367
	    					&& trx->global_read_view) {
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6369
				/* At low transaction isolation levels we let
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				each consistent read set its own snapshot */

6372
				read_view_close_for_mysql(trx);
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			}
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		}
	}

6377
	DBUG_RETURN(0);
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}

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/**********************************************************************
With this function MySQL request a transactional lock to a table when
user issued query LOCK TABLES..WHERE ENGINE = InnoDB. */

int
ha_innobase::transactional_table_lock(
/*==================================*/
6387
			        /* out: error code */
6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408
	THD*	thd,		/* in: handle to the user thread */
	int 	lock_type)	/* in: lock type */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	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 && !current_thd->tablespace_op) {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to use a table handle but the .ibd file for\n"
"table %s does not exist.\n"
"Have you deleted the .ibd file from the database directory under\n"
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6409
"the MySQL datadir?"
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"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"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;

	prebuilt->read_just_key = 0;
	prebuilt->keep_other_fields_on_keyread = FALSE;

	if (lock_type == F_WRLCK) {
		prebuilt->select_lock_type = LOCK_X;
		prebuilt->stored_select_lock_type = LOCK_X;
	} else if (lock_type == F_RDLCK) {
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		prebuilt->select_lock_type = LOCK_S;
		prebuilt->stored_select_lock_type = LOCK_S;
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	} 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 */
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        if (trx->active_trans == 0) {

6444
                innobase_register_trx_and_stmt(thd);
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6445 6446
                trx->active_trans = 1;
        }
6447 6448 6449 6450

	if (thd->in_lock_tables && thd->variables.innodb_table_locks) {
		ulint	error = DB_SUCCESS;

6451
		error = row_lock_table_for_mysql(prebuilt, NULL, 0);
6452 6453

		if (error != DB_SUCCESS) {
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6454 6455
			error = convert_error_code_to_mysql((int) error, user_thd);
			DBUG_RETURN((int) error);
6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470
		}

		if (thd->options & (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);
}

6471 6472 6473
/****************************************************************************
Here we export InnoDB status variables to MySQL.  */

6474
int
6475 6476 6477 6478
innodb_export_status(void)
/*======================*/
{
  srv_export_innodb_status();
6479
  return 0;
6480 6481
}

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6482
/****************************************************************************
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6483
Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
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6484 6485
Monitor to the client. */

6486
bool
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innodb_show_status(
/*===============*/
6489 6490
	THD*	thd,	/* in: the MySQL query thread of the caller */
	stat_print_fn *stat_print)
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6491
{
6492 6493 6494 6495 6496
	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;
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        DBUG_ENTER("innodb_show_status");

6500
        if (have_innodb != SHOW_OPTION_YES) {
6501
                DBUG_RETURN(FALSE);
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6502
        }
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	trx = check_trx_exists(thd);

	innobase_release_stat_resources(trx);

6508 6509
	/* We let the InnoDB Monitor to output at most MAX_STATUS_SIZE
	bytes of text. */
6510

6511
	long	flen, usable_len;
6512
	char*	str;
6513

6514
	mutex_enter_noninline(&srv_monitor_file_mutex);
6515
	rewind(srv_monitor_file);
6516 6517
	srv_printf_innodb_monitor(srv_monitor_file,
				&trx_list_start, &trx_list_end);
6518
	flen = ftell(srv_monitor_file);
6519
	os_file_set_eof(srv_monitor_file);
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6520

6521 6522
	if (flen < 0) {
		flen = 0;
6523 6524 6525 6526 6527 6528
	}

	if (flen > MAX_STATUS_SIZE) {
		usable_len = MAX_STATUS_SIZE;
	} else {
		usable_len = flen;
6529
	}
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6531 6532
	/* allocate buffer for the string, and
	read the contents of the temporary file */
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6534
	if (!(str = my_malloc(usable_len + 1, MYF(0))))
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6535
        {
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6536
          mutex_exit_noninline(&srv_monitor_file_mutex);
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Merge  
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6537
          DBUG_RETURN(TRUE);
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6538
        }
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6540
	rewind(srv_monitor_file);
6541 6542
	if (flen < MAX_STATUS_SIZE) {
		/* Display the entire output. */
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6543
		flen = (long) fread(str, 1, flen, srv_monitor_file);
6544 6545 6546 6547 6548
	} 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. */
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		long len = (long) fread(str, 1, trx_list_start, srv_monitor_file);
6550 6551 6552 6553
		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);
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		len += (long) fread(str + len, 1, usable_len, srv_monitor_file);
6555 6556 6557
		flen = len;
	} else {
		/* Omit the end of the output. */
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6558
		flen = (long) fread(str, 1, MAX_STATUS_SIZE - 1, srv_monitor_file);
6559
	}
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6560

6561
	mutex_exit_noninline(&srv_monitor_file_mutex);
6562

6563
	bool result = FALSE;
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6564

6565 6566
	if (stat_print(thd, innobase_hton.name, "", str)) {
		result= TRUE;
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6567
	}
6568
	my_free(str, MYF(0));
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6569

6570
	DBUG_RETURN(FALSE);
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}

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/****************************************************************************
Implements the SHOW MUTEX STATUS command. . */

bool
innodb_mutex_show_status(
/*===============*/
6579 6580
  THD*  thd,  /* in: the MySQL query thread of the caller */
  stat_print_fn *stat_print)
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{
6582
  char buf1[IO_SIZE], buf2[IO_SIZE];
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  mutex_t*  mutex;
  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;
  DBUG_ENTER("innodb_mutex_show_status");

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#ifdef MUTEX_PROTECT_TO_BE_ADDED_LATER
    mutex_enter(&mutex_list_mutex);
#endif
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  mutex = UT_LIST_GET_FIRST(mutex_list);

  while ( mutex != NULL )
  {
    if (mutex->mutex_type != 1)
    {
      if (mutex->count_using > 0)
      {
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	my_snprintf(buf1, sizeof(buf1), "%s:%s",
		    mutex->cmutex_name, mutex->cfile_name);
	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,
		    mutex->lspent_time/1000);
	if (stat_print(thd, innobase_hton.name, buf1, buf2))
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        {
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#ifdef MUTEX_PROTECT_TO_BE_ADDED_LATER
          mutex_exit(&mutex_list_mutex);
#endif
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          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;
    }

    mutex = UT_LIST_GET_NEXT(list, mutex);
  }

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  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,
	      rw_lock_wait_time/1000);

  if (stat_print(thd, innobase_hton.name, "rw_lock_mutexes", buf2))
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  {
    DBUG_RETURN(1);
  }

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#ifdef MUTEX_PROTECT_TO_BE_ADDED_LATER
      mutex_exit(&mutex_list_mutex);
#endif
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  DBUG_RETURN(FALSE);
}

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bool innobase_show_status(THD* thd, stat_print_fn* stat_print,
			  enum ha_stat_type stat_type)
{
  switch (stat_type) {
  case HA_ENGINE_STATUS:
    return innodb_show_status(thd, stat_print);
  case HA_ENGINE_MUTEX:
    return innodb_mutex_show_status(thd, stat_print);
  default:
    return FALSE;
  }
}


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/****************************************************************************
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

6673
static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
6677
  return (mysql_byte*) share->table_name;
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}

static INNOBASE_SHARE *get_share(const char *table_name)
{
  INNOBASE_SHARE *share;
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  pthread_mutex_lock(&innobase_share_mutex);
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  uint length=(uint) strlen(table_name);
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  if (!(share=(INNOBASE_SHARE*) hash_search(&innobase_open_tables,
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					(mysql_byte*) table_name,
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					    length)))
  {
    if ((share=(INNOBASE_SHARE *) my_malloc(sizeof(*share)+length+1,
				       MYF(MY_WME | MY_ZEROFILL))))
    {
      share->table_name_length=length;
      share->table_name=(char*) (share+1);
      strmov(share->table_name,table_name);
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SCRUM  
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      if (my_hash_insert(&innobase_open_tables, (mysql_byte*) share))
6696
      {
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        pthread_mutex_unlock(&innobase_share_mutex);
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	my_free((gptr) share,0);
	return 0;
      }
      thr_lock_init(&share->lock);
6702
      pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);
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    }
  }
  share->use_count++;
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  pthread_mutex_unlock(&innobase_share_mutex);
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  return share;
}

static void free_share(INNOBASE_SHARE *share)
{
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  pthread_mutex_lock(&innobase_share_mutex);
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  if (!--share->use_count)
  {
6715
    hash_delete(&innobase_open_tables, (mysql_byte*) share);
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    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
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  pthread_mutex_unlock(&innobase_share_mutex);
6721
}
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/*********************************************************************
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Converts a MySQL table lock stored in the 'lock' field of the handle to
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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. */
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THR_LOCK_DATA**
ha_innobase::store_lock(
/*====================*/
						/* out: pointer to the next
						element in the 'to' array */
	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
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						'lock'; this may also be
						TL_IGNORE */
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{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	/* 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! */

6753
	if ((lock_type == TL_READ && thd->in_lock_tables) ||           
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	    (lock_type == TL_READ_HIGH_PRIORITY && thd->in_lock_tables) ||
	    lock_type == TL_READ_WITH_SHARED_LOCKS ||
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	    lock_type == TL_READ_NO_INSERT ||
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	    (thd->lex->sql_command != SQLCOM_SELECT
	     && lock_type != TL_IGNORE)) {
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		/* The OR cases above are in this order:
		1) MySQL is doing LOCK TABLES ... READ LOCAL, 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
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		INSERT INTO ... SELECT ... and the logical logging (MySQL
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6766
		binlog) requires the use of a locking read, or
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		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
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		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. */
6776

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		if (srv_locks_unsafe_for_binlog &&
		    prebuilt->trx->isolation_level != TRX_ISO_SERIALIZABLE &&
		    (lock_type == TL_READ || lock_type == TL_READ_NO_INSERT) &&
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		    (thd->lex->sql_command == SQLCOM_INSERT_SELECT ||
		     thd->lex->sql_command == SQLCOM_UPDATE)) {
6782 6783 6784 6785

			/* In case we have innobase_locks_unsafe_for_binlog
			option set and isolation level of the transaction
			is not set to serializable and MySQL is doing
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			INSERT INTO...SELECT or UPDATE ... = (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;
6792
		} else if (thd->lex->sql_command == SQLCOM_CHECKSUM) {
6793
			/* Use consistent read for checksum table */
6794

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			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;
		}
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	} else if (lock_type != TL_IGNORE) {

	        /* We set possible LOCK_X value in external_lock, not yet
6805
		here even if this would be SELECT ... FOR UPDATE */
6806

6807
		prebuilt->select_lock_type = LOCK_NONE;
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6808
		prebuilt->stored_select_lock_type = LOCK_NONE;
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	}

	if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK) {

6813
                /* Starting from 5.0.7, we weaken also the table locks
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		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 thd->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). */

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		if (lock_type == TL_READ && thd->in_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
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			equivalent to READ. This will change the InnoDB
			behavior in mysqldump, so that dumps of InnoDB tables
			are consistent with dumps of MyISAM tables. */
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			lock_type = TL_READ_NO_INSERT;
		}

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6836
    		/* If we are not doing a LOCK TABLE or DISCARD/IMPORT
6837
		TABLESPACE or TRUNCATE TABLE, then allow multiple writers */
6838 6839

    		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
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6840 6841 6842
	 	    lock_type <= TL_WRITE)
		    && (!thd->in_lock_tables
		        || thd->lex->sql_command == SQLCOM_CALL)
6843
		    && !thd->tablespace_op
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6844
		    && thd->lex->sql_command != SQLCOM_TRUNCATE
6845
                    && thd->lex->sql_command != SQLCOM_OPTIMIZE
6846
                    && thd->lex->sql_command != SQLCOM_CREATE_TABLE) {
6847 6848 6849 6850

      			lock_type = TL_WRITE_ALLOW_WRITE;
      		}

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		/* 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. */
      		
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		if (lock_type == TL_READ_NO_INSERT
		    && (!thd->in_lock_tables
			|| thd->lex->sql_command == SQLCOM_CALL)) {

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			lock_type = TL_READ;
		}
		
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6864
 		lock.type = lock_type;
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  	}

  	*to++= &lock;
6868

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	return(to);
}

6872
/***********************************************************************
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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
6875
counter if it already has been initialized. In parameter ret returns
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6876
the value of the auto-inc counter. */
6877

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int
ha_innobase::innobase_read_and_init_auto_inc(
/*=========================================*/
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				/* out: 0 or error code: deadlock or lock wait
				timeout */
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	longlong*	ret)	/* out: auto-inc value */
6884
{
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  	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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6886
    	longlong        auto_inc;
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	ulint		old_select_lock_type;
	ibool		trx_was_not_started	= FALSE;
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  	int     	error;
6890

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  	ut_a(prebuilt);
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	ut_a(prebuilt->trx ==
6893
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	ut_a(prebuilt->table);
	
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	if (prebuilt->trx->conc_state == TRX_NOT_STARTED) {
		trx_was_not_started = TRUE;
	}

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	/* 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);

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	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		/* Already initialized */
		*ret = auto_inc;
	
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		error = 0;

		goto func_exit_early;
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	}
6915

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	error = row_lock_table_autoinc_for_mysql(prebuilt);
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	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);
6920

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		goto func_exit_early;
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	}	
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	/* Check again if someone has initialized the counter meanwhile */
	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		*ret = auto_inc;
	
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		error = 0;

		goto func_exit_early;
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	}
6934

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  	(void) extra(HA_EXTRA_KEYREAD);
6936
  	index_init(table->s->next_number_index, 1);
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	/* Starting from 5.0.9, we use a consistent read to read the auto-inc
	column maximum value. This eliminates the spurious deadlocks caused
	by the row X-lock that we previously used. Note the following flaw
	in our algorithm: if some other user meanwhile UPDATEs the auto-inc
	column, our consistent read will not return the largest value. We
	accept this flaw, since the deadlocks were a bigger trouble. */
6944

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  	/* Fetch all the columns in the key */
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	prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
6948

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	old_select_lock_type = prebuilt->select_lock_type;
  	prebuilt->select_lock_type = LOCK_NONE;

	/* Eliminate an InnoDB error print that happens when we try to SELECT
	from a table when no table has been locked in ::external_lock(). */
	prebuilt->trx->n_mysql_tables_in_use++;

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	error = index_last(table->record[1]);
6957

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	prebuilt->trx->n_mysql_tables_in_use--;
  	prebuilt->select_lock_type = old_select_lock_type;

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  	if (error) {
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		if (error == HA_ERR_END_OF_FILE) {
			/* The table was empty, initialize to 1 */
			auto_inc = 1;

			error = 0;
		} else {
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			/* This should not happen in a consistent read */
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		  sql_print_error("Consistent read of auto-inc column "
				  "returned %lu", (ulong) error);
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  			auto_inc = -1;

  			goto func_exit;
  		}
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  	} else {
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		/* Initialize to max(col) + 1; we use
		'found_next_number_field' below because MySQL in SHOW TABLE
		STATUS does not seem to set 'next_number_field'. The comment
		in table.h says that 'next_number_field' is set when it is
		'active'. */

    		auto_inc = (longlong) table->found_next_number_field->
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                        	val_int_offset(table->s->rec_buff_length) + 1;
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  	}
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	dict_table_autoinc_initialize(prebuilt->table, auto_inc);

func_exit:
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  	(void) extra(HA_EXTRA_NO_KEYREAD);
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	index_end();

	*ret = auto_inc;

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func_exit_early:
	/* Since MySQL does not seem to call autocommit after SHOW TABLE
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	STATUS (even if we would register the trx here), we commit our
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	transaction here if it was started here. This is to eliminate a
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	dangling transaction. If the user had AUTOCOMMIT=0, then SHOW
	TABLE STATUS does leave a dangling transaction if the user does not
	himself call COMMIT. */
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	if (trx_was_not_started) {

		innobase_commit_low(prebuilt->trx);
	}

 	return(error);
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}

/***********************************************************************
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. */

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ulonglong
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ha_innobase::get_auto_increment()
/*=============================*/
                         /* out: auto-increment column value, -1 if error
                         (deadlock or lock wait timeout) */
{
  	longlong        nr;
  	int     	error;
	
	error = innobase_read_and_init_auto_inc(&nr);

	if (error) {
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		/* This should never happen in the current (5.0.6) code, since
		we call this function only after the counter has been
		initialized. */
	
		ut_print_timestamp(stderr);
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		sql_print_error("Error %lu in ::get_auto_increment()",
				(ulong) error);
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          	return(~(ulonglong) 0);
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	}
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	return((ulonglong) nr);
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}

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/* See comment in handler.h */
int
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ha_innobase::reset_auto_increment(ulonglong value)
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{
	DBUG_ENTER("ha_innobase::reset_auto_increment");

	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
  	int     	error;

	error = row_lock_table_autoinc_for_mysql(prebuilt);

	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);

		DBUG_RETURN(error);
	}	

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	dict_table_autoinc_initialize(prebuilt->table, value);
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	DBUG_RETURN(0);
}

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/* See comment in handler.cc */
bool
ha_innobase::get_error_message(int error, String *buf)
{
	trx_t*	    trx = check_trx_exists(current_thd);

	buf->copy(trx->detailed_error, strlen(trx->detailed_error),
		system_charset_info);

	return FALSE;
}

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/***********************************************************************
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. */
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int
ha_innobase::cmp_ref(
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/*=================*/
				/* out: < 0 if ref1 < ref2, 0 if equal, else
				> 0 */
	const mysql_byte* ref1,	/* in: an (internal) primary key value in the
				MySQL key value format */
	const mysql_byte* ref2)	/* in: an (internal) primary key value in the
				MySQL key value format */
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{
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
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	enum_field_types mysql_type;
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	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;

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	for (; key_part != key_part_end; ++key_part) {
		field = key_part->field;
		mysql_type = field->type();
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		if (mysql_type == FIELD_TYPE_TINY_BLOB
		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
		    
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			/* 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);

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			ref1 += 2;
			ref2 += 2;
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			result = ((Field_blob*)field)->cmp(
						    (const char*)ref1, len1,
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			                            (const char*)ref2, len2);
		} else {
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			result = field->key_cmp(ref1, ref2);
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		}

		if (result) {

			return(result);
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		}

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		ref1 += key_part->store_length;
		ref2 += key_part->store_length;
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	}
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	return(0);
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}

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char*
ha_innobase::get_mysql_bin_log_name()
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{
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	return(trx_sys_mysql_bin_log_name);
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}

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ulonglong
ha_innobase::get_mysql_bin_log_pos()
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{
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  	/* trx... is ib_longlong, 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);
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}

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extern "C" {
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/**********************************************************************
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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.

NOTE: the prototype of this function is copied to data0type.c! If you change
this function, you MUST change also data0type.c! */
7174

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ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
				/* out: number of bytes occupied by the first
				n characters */
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	ulint charset_id,	/* in: character set id */
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	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 */
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{
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	ulint char_length;	/* character length in bytes */
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	ulint n_chars;		/* number of characters in prefix */
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	CHARSET_INFO* charset;	/* charset used in the field */
7190

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	charset = get_charset((uint) charset_id, MYF(MY_WME));
7192

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	ut_ad(charset);
	ut_ad(charset->mbmaxlen);
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	/* Calculate how many characters at most the prefix index contains */
7197

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	n_chars = prefix_len / charset->mbmaxlen;
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	/* 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
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	character. */
7204

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	if (charset->mbmaxlen > 1) {
		/* my_charpos() returns the byte length of the first n_chars
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		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. */
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		char_length = my_charpos(charset, str,
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						str + data_len, (int) n_chars);
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		if (char_length > data_len) {
			char_length = data_len;
		}		
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	} else {
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		if (data_len < prefix_len) {
			char_length = data_len;
		} else {
			char_length = prefix_len;
		}
7235
	}
7236

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	return(char_length);
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}
}

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extern "C" {
/**********************************************************************
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This function returns true if 

1) SQL-query in the current thread
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is either REPLACE or LOAD DATA INFILE REPLACE. 
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2) SQL-query in the current thread
is INSERT ON DUPLICATE KEY UPDATE.

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NOTE that /mysql/innobase/row/row0ins.c must contain the 
prototype for this function ! */

ibool
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innobase_query_is_update(void)
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/*==========================*/
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{
	THD*	thd;
	
	thd = (THD *)innobase_current_thd();
	
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	if (thd->lex->sql_command == SQLCOM_REPLACE ||
	    thd->lex->sql_command == SQLCOM_REPLACE_SELECT ||
	    (thd->lex->sql_command == SQLCOM_LOAD &&
	     thd->lex->duplicates == DUP_REPLACE)) {

		return(1);
7268
	}
7269

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	if (thd->lex->sql_command == SQLCOM_INSERT &&
	    thd->lex->duplicates  == DUP_UPDATE) {

		return(1);
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	}

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	return(0);
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}
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}

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/***********************************************************************
This function is used to prepare X/Open XA distributed transaction   */

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int 
innobase_xa_prepare(
/*================*/
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			/* out: 0 or error number */
	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;
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        trx_t* trx = check_trx_exists(thd);

        if (thd->lex->sql_command != SQLCOM_XA_PREPARE) {

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                /* 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
                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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	if (!thd->variables.innodb_support_xa) {

		return(0);
	}

7325
        trx->xid=thd->transaction.xid_state.xid;
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	/* 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) {

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

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	if (all
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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                /* We were instructed to prepare the whole transaction, or
                this is an SQL statement end and autocommit is on */
7344

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                ut_ad(trx->active_trans);
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		error = (int) trx_prepare_for_mysql(trx);
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	} else {
	        /* We just mark the SQL statement ended and do not do a
		transaction prepare */

		if (trx->auto_inc_lock) {
			/* If we had reserved the auto-inc lock for some
			table in this SQL statement we release it now */
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			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();

        return error;
}

/***********************************************************************
This function is used to recover X/Open XA distributed transactions   */

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int 
innobase_xa_recover(
/*================*/
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				/* out: number of prepared transactions 
				stored in xid_list */
	XID*    xid_list, 	/* in/out: prepared transactions */
	uint	len)		/* in: number of slots in xid_list */
{
	if (len == 0 || xid_list == NULL) {
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		return(0);
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	}

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	return(trx_recover_for_mysql(xid_list, len));
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}

/***********************************************************************
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state */

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int 
innobase_commit_by_xid(
/*===================*/
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			/* out: 0 or error number */
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	XID*	xid)	/* in: X/Open XA transaction identification */
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{
	trx_t*	trx;

	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 */

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int 
innobase_rollback_by_xid(
/*=====================*/
7422
			/* out: 0 or error number */
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	XID	*xid)	/* in: X/Open XA transaction identification */
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{
	trx_t*	trx;

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		return(innobase_rollback_trx(trx));
	} else {
		return(XAER_NOTA);
	}
}

7436
/***********************************************************************
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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. */
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void*
innobase_create_cursor_view(void)
/*=============================*/
			/* out: Pointer to cursor view or NULL */
{
	return(read_cursor_view_create_for_mysql(
					check_trx_exists(current_thd)));
}

/***********************************************************************
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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. */
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void
innobase_close_cursor_view(
/*=======================*/
	void*	curview)/* in: Consistent read view to be closed */
{
	read_cursor_view_close_for_mysql(check_trx_exists(current_thd),
						(cursor_view_t*) curview);
}

/***********************************************************************
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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. */
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void
innobase_set_cursor_view(
/*=====================*/
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	void*	curview)/* in: Consistent cursor view to be set */
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{
	read_cursor_set_for_mysql(check_trx_exists(current_thd), 
						(cursor_view_t*) curview);
}

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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;
  
  /* Check that row format didn't change */
  if ((info->used_fields & HA_CREATE_USED_AUTO) &&
      get_row_type() != info->row_type)
    return COMPATIBLE_DATA_NO;

  return COMPATIBLE_DATA_YES;
}