row0mysql.c 89.1 KB
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/******************************************************
Interface between Innobase row operations and MySQL.
Contains also create table and other data dictionary operations.

(c) 2000 Innobase Oy

Created 9/17/2000 Heikki Tuuri
*******************************************************/
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#include "row0mysql.h"

#ifdef UNIV_NONINL
#include "row0mysql.ic"
#endif

#include "row0ins.h"
#include "row0sel.h"
#include "row0upd.h"
#include "row0row.h"
#include "que0que.h"
#include "pars0pars.h"
#include "dict0dict.h"
#include "dict0crea.h"
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#include "dict0load.h"
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#include "dict0boot.h"
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#include "trx0roll.h"
#include "trx0purge.h"
#include "lock0lock.h"
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#include "rem0cmp.h"
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#include "log0log.h"
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#include "btr0sea.h"
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#include "fil0fil.h"
#include "ibuf0ibuf.h"
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/* A dummy variable used to fool the compiler */
ibool	row_mysql_identically_false	= FALSE;

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/* List of tables we should drop in background. ALTER TABLE in MySQL requires
that the table handler can drop the table in background when there are no
queries to it any more. Protected by the kernel mutex. */
typedef struct row_mysql_drop_struct	row_mysql_drop_t;
struct row_mysql_drop_struct{
	char*				table_name;
	UT_LIST_NODE_T(row_mysql_drop_t) row_mysql_drop_list;
};

UT_LIST_BASE_NODE_T(row_mysql_drop_t)	row_mysql_drop_list;
ibool	row_mysql_drop_list_inited 	= FALSE;
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/* Magic table names for invoking various monitor threads */
static const char S_innodb_monitor[] = "innodb_monitor";
static const char S_innodb_lock_monitor[] = "innodb_lock_monitor";
static const char S_innodb_tablespace_monitor[] = "innodb_tablespace_monitor";
static const char S_innodb_table_monitor[] = "innodb_table_monitor";
static const char S_innodb_mem_validate[] = "innodb_mem_validate";

/* Name suffix for recovered orphaned temporary tables */
static const char S_recover_innodb_tmp_table[] = "_recover_innodb_tmp_table";
/***********************************************************************
Determine if the given name ends in the suffix reserved for recovered
orphaned temporary tables. */
static
ibool
row_mysql_is_recovered_tmp_table(
/*=============================*/
				 /* out: TRUE if table name ends in
				 the reserved suffix */
	const char*	name)
{
	ulint	namelen	= strlen(name) + 1;
	return(namelen >= sizeof S_recover_innodb_tmp_table
		&& !memcmp(name + namelen -
			sizeof S_recover_innodb_tmp_table,
			S_recover_innodb_tmp_table,
			sizeof S_recover_innodb_tmp_table));
}

/***********************************************************************
Determine if the given name is a name reserved for MySQL system tables. */
static
ibool
row_mysql_is_system_table(
/*======================*/
				 /* out: TRUE if name is a MySQL
				 system table name */
	const char*	name)
{
	if (memcmp(name, "mysql/", 6)) {
		return(FALSE);
	}
	return(0 == strcmp(name + 6, "host")
	    || 0 == strcmp(name + 6, "user")
	    || 0 == strcmp(name + 6, "db"));
}
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/***********************************************************************
Delays an INSERT, DELETE or UPDATE operation if the purge is lagging. */
static
void
row_mysql_delay_if_needed(void)
/*===========================*/
{
	if (srv_dml_needed_delay) {
		os_thread_sleep(srv_dml_needed_delay);
	}
}

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/***********************************************************************
Reads a MySQL format variable-length field (like VARCHAR) length and
returns pointer to the field data. */

byte*
row_mysql_read_var_ref_noninline(
/*=============================*/
			/* out: field + 2 */
	ulint*	len,	/* out: variable-length field length */
	byte*	field)	/* in: field */
{
	return(row_mysql_read_var_ref(len, field));
}

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/***********************************************************************
Frees the blob heap in prebuilt when no longer needed. */

void
row_mysql_prebuilt_free_blob_heap(
/*==============================*/
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct of a
					ha_innobase:: table handle */
{
	mem_heap_free(prebuilt->blob_heap);
	prebuilt->blob_heap = NULL;
}

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/***********************************************************************
Stores a reference to a BLOB in the MySQL format. */

void
row_mysql_store_blob_ref(
/*=====================*/
	byte*	dest,		/* in: where to store */
	ulint	col_len,	/* in: dest buffer size: determines into
				how many bytes the BLOB length is stored,
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				the space for the length may vary from 1
				to 4 bytes */
	byte*	data,		/* in: BLOB data; if the value to store
				is SQL NULL this should be NULL pointer */
	ulint	len)		/* in: BLOB length; if the value to store
				is SQL NULL this should be 0; remember
				also to set the NULL bit in the MySQL record
				header! */
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{
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	/* MySQL might assume the field is set to zero except the length and
	the pointer fields */

	memset(dest, '\0', col_len);

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	/* In dest there are 1 - 4 bytes reserved for the BLOB length,
	and after that 8 bytes reserved for the pointer to the data.
	In 32-bit architectures we only use the first 4 bytes of the pointer
	slot. */

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	ut_a(col_len - 8 > 1 || len < 256);
	ut_a(col_len - 8 > 2 || len < 256 * 256);
	ut_a(col_len - 8 > 3 || len < 256 * 256 * 256);

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	mach_write_to_n_little_endian(dest, col_len - 8, len);

	ut_memcpy(dest + col_len - 8, (byte*)&data, sizeof(byte*));	
}

/***********************************************************************
Reads a reference to a BLOB in the MySQL format. */

byte*
row_mysql_read_blob_ref(
/*====================*/
				/* out: pointer to BLOB data */
	ulint*	len,		/* out: BLOB length */
	byte*	ref,		/* in: BLOB reference in the MySQL format */
	ulint	col_len)	/* in: BLOB reference length (not BLOB
				length) */
{
	byte*	data;

	*len = mach_read_from_n_little_endian(ref, col_len - 8);

	ut_memcpy((byte*)&data, ref + col_len - 8, sizeof(byte*));

	return(data);
}

/******************************************************************
Convert a row in the MySQL format to a row in the Innobase format. */
static
void
row_mysql_convert_row_to_innobase(
/*==============================*/
	dtuple_t*	row,		/* in/out: Innobase row where the
					field type information is already
					copied there, or will be copied
					later */
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct where template
					must be of type ROW_MYSQL_WHOLE_ROW */
	byte*		mysql_rec)	/* in: row in the MySQL format;
					NOTE: do not discard as long as
					row is used, as row may contain
					pointers to this record! */
{
	mysql_row_templ_t*	templ;	
	dfield_t*		dfield;
	ulint			i;
	
	ut_ad(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
	ut_ad(prebuilt->mysql_template);

	for (i = 0; i < prebuilt->n_template; i++) {

		templ = prebuilt->mysql_template + i;
		dfield = dtuple_get_nth_field(row, i);

		if (templ->mysql_null_bit_mask != 0) {
			/* Column may be SQL NULL */

			if (mysql_rec[templ->mysql_null_byte_offset] &
 					(byte) (templ->mysql_null_bit_mask)) {

				/* It is SQL NULL */

				dfield_set_data(dfield, NULL, UNIV_SQL_NULL);

				goto next_column;
			}
		}			
		
		row_mysql_store_col_in_innobase_format(dfield,
					prebuilt->ins_upd_rec_buff
						+ templ->mysql_col_offset,
					mysql_rec + templ->mysql_col_offset,
					templ->mysql_col_len,
					templ->type, templ->is_unsigned);
next_column:
		;
	} 
}

/********************************************************************
Handles user errors and lock waits detected by the database engine. */

ibool
row_mysql_handle_errors(
/*====================*/
				/* out: TRUE if it was a lock wait and
				we should continue running the query thread */
	ulint*		new_err,/* out: possible new error encountered in
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				lock wait, or if no new error, the value
				of trx->error_state at the entry of this
				function */
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	trx_t*		trx,	/* in: transaction */
	que_thr_t*	thr,	/* in: query thread */
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	trx_savept_t*	savept)	/* in: savepoint or NULL */
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{
	ulint	err;

handle_new_error:
	err = trx->error_state;
	
	ut_a(err != DB_SUCCESS);
	
	trx->error_state = DB_SUCCESS;

	if (err == DB_DUPLICATE_KEY) {
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           	if (savept) {
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			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
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		}
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	} else if (err == DB_TOO_BIG_RECORD) {
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           	if (savept) {
			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
		}
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		/* MySQL will roll back the latest SQL statement */
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	} else if (err == DB_ROW_IS_REFERENCED
		   || err == DB_NO_REFERENCED_ROW
		   || err == DB_CANNOT_ADD_CONSTRAINT) {
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           	if (savept) {
			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
		}
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		/* MySQL will roll back the latest SQL statement */
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	} else if (err == DB_LOCK_WAIT) {

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		srv_suspend_mysql_thread(thr);
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		if (trx->error_state != DB_SUCCESS) {
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			que_thr_stop_for_mysql(thr);

			goto handle_new_error;
		}

		*new_err = err;

		return(TRUE);

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	} else if (err == DB_DEADLOCK || err == DB_LOCK_WAIT_TIMEOUT
		   || err == DB_LOCK_TABLE_FULL) {
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		/* Roll back the whole transaction; this resolution was added
		to version 3.23.43 */
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		trx_general_rollback_for_mysql(trx, FALSE, NULL);
				
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	} else if (err == DB_OUT_OF_FILE_SPACE) {
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           	if (savept) {
			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
		}
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		/* MySQL will roll back the latest SQL statement */
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	} else if (err == DB_MUST_GET_MORE_FILE_SPACE) {

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		fputs(
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		"InnoDB: The database cannot continue operation because of\n"
		"InnoDB: lack of space. You must add a new data file to\n"
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		"InnoDB: my.cnf and restart the database.\n", stderr);
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		exit(1);
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	} else if (err == DB_CORRUPTION) {

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	       fputs(
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	    "InnoDB: We detected index corruption in an InnoDB type table.\n"
	    "InnoDB: You have to dump + drop + reimport the table or, in\n"
	    "InnoDB: a case of widespread corruption, dump all InnoDB\n"
	    "InnoDB: tables and recreate the whole InnoDB tablespace.\n"
	    "InnoDB: If the mysqld server crashes after the startup or when\n"
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	    "InnoDB: you dump the tables, look at\n"
	    "InnoDB: http://dev.mysql.com/doc/mysql/en/Forcing_recovery.html"
	    " for help.\n", stderr);
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	} else {
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		fprintf(stderr, "InnoDB: unknown error code %lu\n",
			(ulong) err);
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		ut_error;
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	}		

	if (trx->error_state != DB_SUCCESS) {
		*new_err = trx->error_state;
	} else {
		*new_err = err;
	}
	
	trx->error_state = DB_SUCCESS;

	return(FALSE);
}

/************************************************************************
Create a prebuilt struct for a MySQL table handle. */

row_prebuilt_t*
row_create_prebuilt(
/*================*/
				/* out, own: a prebuilt struct */
	dict_table_t*	table)	/* in: Innobase table handle */
{
	row_prebuilt_t*	prebuilt;
	mem_heap_t*	heap;
	dict_index_t*	clust_index;
	dtuple_t*	ref;
	ulint		ref_len;
	ulint		i;
	
	heap = mem_heap_create(128);

	prebuilt = mem_heap_alloc(heap, sizeof(row_prebuilt_t));

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	prebuilt->magic_n = ROW_PREBUILT_ALLOCATED;
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	prebuilt->magic_n2 = ROW_PREBUILT_ALLOCATED;
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	prebuilt->table = table;

	prebuilt->trx = NULL;

	prebuilt->sql_stat_start = TRUE;

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	prebuilt->mysql_has_locked = FALSE;

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	prebuilt->index = NULL;
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	prebuilt->used_in_HANDLER = FALSE;

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	prebuilt->n_template = 0;
	prebuilt->mysql_template = NULL;

	prebuilt->heap = heap;
	prebuilt->ins_node = NULL;

	prebuilt->ins_upd_rec_buff = NULL;
	
	prebuilt->upd_node = NULL;
	prebuilt->ins_graph = NULL;
	prebuilt->upd_graph = NULL;

  	prebuilt->pcur = btr_pcur_create_for_mysql();
  	prebuilt->clust_pcur = btr_pcur_create_for_mysql();

	prebuilt->select_lock_type = LOCK_NONE;
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	prebuilt->stored_select_lock_type = 99999999;
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	prebuilt->sel_graph = NULL;

	prebuilt->search_tuple = dtuple_create(heap,
						dict_table_get_n_cols(table));
	
	clust_index = dict_table_get_first_index(table);

	ref_len = dict_index_get_n_unique(clust_index);

	ref = dtuple_create(heap, ref_len);

	dict_index_copy_types(ref, clust_index, ref_len);

	prebuilt->clust_ref = ref;

	for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) {
		prebuilt->fetch_cache[i] = NULL;
	}

	prebuilt->n_fetch_cached = 0;

	prebuilt->blob_heap = NULL;

	prebuilt->old_vers_heap = NULL;
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	return(prebuilt);
}

/************************************************************************
Free a prebuilt struct for a MySQL table handle. */

void
row_prebuilt_free(
/*==============*/
	row_prebuilt_t*	prebuilt)	/* in, own: prebuilt struct */
{
	ulint	i;

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	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED
	    || prebuilt->magic_n2 != ROW_PREBUILT_ALLOCATED) {
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		fprintf(stderr,
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"InnoDB: Error: trying to free a corrupt\n"
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"InnoDB: table handle. Magic n %lu, magic n2 %lu, table name",
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		(ulong) prebuilt->magic_n,
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		(ulong) prebuilt->magic_n2);
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		ut_print_name(stderr, NULL, prebuilt->table->name);
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		putc('\n', stderr);
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		mem_analyze_corruption((byte*)prebuilt);

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		ut_error;
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	}

	prebuilt->magic_n = ROW_PREBUILT_FREED;
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	prebuilt->magic_n2 = ROW_PREBUILT_FREED;
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	btr_pcur_free_for_mysql(prebuilt->pcur);
	btr_pcur_free_for_mysql(prebuilt->clust_pcur);

	if (prebuilt->mysql_template) {
		mem_free(prebuilt->mysql_template);
	}

	if (prebuilt->ins_graph) {
		que_graph_free_recursive(prebuilt->ins_graph);
	}

	if (prebuilt->sel_graph) {
		que_graph_free_recursive(prebuilt->sel_graph);
	}
	
	if (prebuilt->upd_graph) {
		que_graph_free_recursive(prebuilt->upd_graph);
	}
	
	if (prebuilt->blob_heap) {
		mem_heap_free(prebuilt->blob_heap);
	}

	if (prebuilt->old_vers_heap) {
		mem_heap_free(prebuilt->old_vers_heap);
	}
	
	for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) {
		if (prebuilt->fetch_cache[i] != NULL) {
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			if ((ROW_PREBUILT_FETCH_MAGIC_N !=
			    mach_read_from_4((prebuilt->fetch_cache[i]) - 4))
			    || (ROW_PREBUILT_FETCH_MAGIC_N !=
			    mach_read_from_4((prebuilt->fetch_cache[i])
			    			+ prebuilt->mysql_row_len))) {
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				fputs(
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			"InnoDB: Error: trying to free a corrupt\n"
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			"InnoDB: fetch buffer.\n", stderr);
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				mem_analyze_corruption(
						prebuilt->fetch_cache[i]);

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				ut_error;
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			}

			mem_free((prebuilt->fetch_cache[i]) - 4);
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		}
	}

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	dict_table_decrement_handle_count(prebuilt->table);

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	mem_heap_free(prebuilt->heap);
}

/*************************************************************************
Updates the transaction pointers in query graphs stored in the prebuilt
struct. */

void
row_update_prebuilt_trx(
/*====================*/
					/* out: prebuilt dtuple */
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct in MySQL
					handle */
	trx_t*		trx)		/* in: transaction handle */
{	
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	if (trx->magic_n != TRX_MAGIC_N) {
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		fprintf(stderr,
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		"InnoDB: Error: trying to use a corrupt\n"
		"InnoDB: trx handle. Magic n %lu\n",
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		(ulong) trx->magic_n);
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		mem_analyze_corruption((byte*)trx);
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		ut_error;
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	}

	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) {
		fprintf(stderr,
		"InnoDB: Error: trying to use a corrupt\n"
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		"InnoDB: table handle. Magic n %lu, table name",
		(ulong) prebuilt->magic_n);
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		ut_print_name(stderr, NULL, prebuilt->table->name);
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		putc('\n', stderr);
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		mem_analyze_corruption((byte*)prebuilt);

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		ut_error;
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	}

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	prebuilt->trx = trx;

	if (prebuilt->ins_graph) {
		prebuilt->ins_graph->trx = trx;
	}

	if (prebuilt->upd_graph) {
		prebuilt->upd_graph->trx = trx;
	}

	if (prebuilt->sel_graph) {
		prebuilt->sel_graph->trx = trx;
	}	
}

/*************************************************************************
Gets pointer to a prebuilt dtuple used in insertions. If the insert graph
has not yet been built in the prebuilt struct, then this function first
builds it. */
static
dtuple_t*
row_get_prebuilt_insert_row(
/*========================*/
					/* out: prebuilt dtuple */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	ins_node_t*	node;
	dtuple_t*	row;
	dict_table_t*	table	= prebuilt->table;
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	ulint		i;
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	ut_ad(prebuilt && table && prebuilt->trx);
	
	if (prebuilt->ins_node == NULL) {

		/* Not called before for this handle: create an insert node
		and query graph to the prebuilt struct */

		node = ins_node_create(INS_DIRECT, table, prebuilt->heap);
		
		prebuilt->ins_node = node;

		if (prebuilt->ins_upd_rec_buff == NULL) {
			prebuilt->ins_upd_rec_buff = mem_heap_alloc(
						prebuilt->heap,
						prebuilt->mysql_row_len);
		}
		
		row = dtuple_create(prebuilt->heap,
					dict_table_get_n_cols(table));

		dict_table_copy_types(row, table);

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		/* We init the value of every field to the SQL NULL to avoid
		a debug assertion from failing */

		for (i = 0; i < dtuple_get_n_fields(row); i++) {
		    
		        dtuple_get_nth_field(row, i)->len = UNIV_SQL_NULL;
		}

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		ins_node_set_new_row(node, row);

		prebuilt->ins_graph =
			que_node_get_parent(
				pars_complete_graph_for_exec(node,
							prebuilt->trx,
							prebuilt->heap));
		prebuilt->ins_graph->state = QUE_FORK_ACTIVE;
	}

	return(prebuilt->ins_node->row);	
}

/*************************************************************************
Updates the table modification counter and calculates new estimates
for table and index statistics if necessary. */
UNIV_INLINE
void
row_update_statistics_if_needed(
/*============================*/
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	dict_table_t*	table)	/* in: table */
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{
	ulint	counter;
	
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	counter = table->stat_modified_counter;
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	table->stat_modified_counter = counter + 1;
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	/* Calculate new statistics if 1 / 16 of table has been modified
	since the last time a statistics batch was run, or if
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	stat_modified_counter > 2 000 000 000 (to avoid wrap-around).
	We calculate statistics at most every 16th round, since we may have
	a counter table which is very small and updated very often. */
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	if (counter > 2000000000
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	    || ((ib_longlong)counter > 16 + table->stat_n_rows / 16)) {
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		dict_update_statistics(table);
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	}	
}
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/*************************************************************************
Unlocks an AUTO_INC type lock possibly reserved by trx. */

void		  	
row_unlock_table_autoinc_for_mysql(
/*===============================*/
	trx_t*	trx)	/* in: transaction */
{
	if (!trx->auto_inc_lock) {

		return;
	}

	lock_table_unlock_auto_inc(trx);
}

/*************************************************************************
Sets an AUTO_INC type lock on the table mentioned in prebuilt. The
AUTO_INC lock gives exclusive access to the auto-inc counter of the
table. The lock is reserved only for the duration of an SQL statement.
It is not compatible with another AUTO_INC or exclusive lock on the
table. */

int
row_lock_table_autoinc_for_mysql(
/*=============================*/
					/* out: error code or DB_SUCCESS */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in the MySQL
					table handle */
{
	trx_t*		trx 		= prebuilt->trx;
	ins_node_t*	node		= prebuilt->ins_node;
	que_thr_t*	thr;
	ulint		err;
	ibool		was_lock_wait;
	
	ut_ad(trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	
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	if (trx->auto_inc_lock) {

		return(DB_SUCCESS);
	}

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	trx->op_info = "setting auto-inc lock";
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	if (node == NULL) {
		row_get_prebuilt_insert_row(prebuilt);
		node = prebuilt->ins_node;
	}

	/* We use the insert query graph as the dummy graph needed
	in the lock module call */

	thr = que_fork_get_first_thr(prebuilt->ins_graph);

	que_thr_move_to_run_state_for_mysql(thr, trx);

run_again:
	thr->run_node = node;
	thr->prev_node = node;

	/* It may be that the current session has not yet started
	its transaction, or it has been committed: */
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	trx_start_if_not_started(trx);

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	err = lock_table(0, prebuilt->table, LOCK_AUTO_INC, thr);
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	trx->error_state = err;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);

		was_lock_wait = row_mysql_handle_errors(&err, trx, thr, NULL);

		if (was_lock_wait) {
			goto run_again;
		}

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		trx->op_info = "";
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		return(err);
	}

	que_thr_stop_for_mysql_no_error(thr, trx);

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	trx->op_info = "";
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	return((int) err);
}

/*************************************************************************
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Unlocks all table locks explicitly requested by trx (with LOCK TABLES,
lock type LOCK_TABLE_EXP). */
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void		  	
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row_unlock_tables_for_mysql(
/*========================*/
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	trx_t*	trx)	/* in: transaction */
{
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	if (!trx->n_lock_table_exp) {
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		return;
	}

	mutex_enter(&kernel_mutex);
	lock_release_tables_off_kernel(trx);
	mutex_exit(&kernel_mutex);
}
/*************************************************************************
Sets a table lock on the table mentioned in prebuilt. */

int
row_lock_table_for_mysql(
/*=====================*/
					/* out: error code or DB_SUCCESS */
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	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct in the MySQL
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					table handle */
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	dict_table_t*	table,		/* in: table to lock, or NULL
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					if prebuilt->table should be
					locked as LOCK_TABLE_EXP |
					prebuilt->select_lock_type */
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	ulint		mode)		/* in: lock mode of table */
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{
	trx_t*		trx 		= prebuilt->trx;
	que_thr_t*	thr;
	ulint		err;
	ibool		was_lock_wait;
	
	ut_ad(trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());

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	trx->op_info = "setting table lock";
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	if (prebuilt->sel_graph == NULL) {
		/* Build a dummy select query graph */
		row_prebuild_sel_graph(prebuilt);
	}

	/* We use the select query graph as the dummy graph needed
	in the lock module call */

	thr = que_fork_get_first_thr(prebuilt->sel_graph);

	que_thr_move_to_run_state_for_mysql(thr, trx);

run_again:
	thr->run_node = thr;
	thr->prev_node = thr->common.parent;

	/* It may be that the current session has not yet started
	its transaction, or it has been committed: */

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	trx_start_if_not_started(trx);

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	if (table) {
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		err = lock_table(0, table, mode, thr);
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	} else {
		err = lock_table(LOCK_TABLE_EXP, prebuilt->table,
			prebuilt->select_lock_type, thr);
	}
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	trx->error_state = err;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);

		was_lock_wait = row_mysql_handle_errors(&err, trx, thr, NULL);

		if (was_lock_wait) {
			goto run_again;
		}

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		trx->op_info = "";
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		return(err);
	}

	que_thr_stop_for_mysql_no_error(thr, trx);
		
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	trx->op_info = "";
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	return((int) err);	
}
					
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/*************************************************************************
Does an insert for MySQL. */

int
row_insert_for_mysql(
/*=================*/
					/* out: error code or DB_SUCCESS */
	byte*		mysql_rec,	/* in: row in the MySQL format */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	trx_savept_t	savept;
	que_thr_t*	thr;
	ulint		err;
	ibool		was_lock_wait;
	trx_t*		trx 		= prebuilt->trx;
	ins_node_t*	node		= prebuilt->ins_node;
	
	ut_ad(trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	
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	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) {
		fprintf(stderr,
		"InnoDB: Error: trying to free a corrupt\n"
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		"InnoDB: table handle. Magic n %lu, table name",
		(ulong) prebuilt->magic_n);
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		ut_print_name(stderr, prebuilt->trx, prebuilt->table->name);
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		putc('\n', stderr);
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		mem_analyze_corruption((byte*)prebuilt);

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		ut_error;
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	}

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	if (srv_created_new_raw || srv_force_recovery) {
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		fputs(
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		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
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		"InnoDB: with raw, and innodb_force_... is removed.\n",
			stderr);
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		return(DB_ERROR);
	}

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	trx->op_info = "inserting";
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	row_mysql_delay_if_needed();

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	trx_start_if_not_started(trx);

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	if (node == NULL) {
		row_get_prebuilt_insert_row(prebuilt);
		node = prebuilt->ins_node;
	}

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	row_mysql_convert_row_to_innobase(node->row, prebuilt, mysql_rec);
	
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	savept = trx_savept_take(trx);
	
	thr = que_fork_get_first_thr(prebuilt->ins_graph);

	if (prebuilt->sql_stat_start) {
		node->state = INS_NODE_SET_IX_LOCK;
		prebuilt->sql_stat_start = FALSE;
	} else {
		node->state = INS_NODE_ALLOC_ROW_ID;
	}
	
	que_thr_move_to_run_state_for_mysql(thr, trx);

run_again:
	thr->run_node = node;
	thr->prev_node = node;

	row_ins_step(thr);
	
	err = trx->error_state;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);

		was_lock_wait = row_mysql_handle_errors(&err, trx, thr,
								&savept);
		if (was_lock_wait) {
			goto run_again;
		}

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		trx->op_info = "";
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		return(err);
	}

	que_thr_stop_for_mysql_no_error(thr, trx);
	
	prebuilt->table->stat_n_rows++;

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	srv_n_rows_inserted++;
	
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	if (prebuilt->table->stat_n_rows == 0) {
		/* Avoid wrap-over */
		prebuilt->table->stat_n_rows--;
	}	

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	row_update_statistics_if_needed(prebuilt->table);
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	trx->op_info = "";
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	return((int) err);
}

/*************************************************************************
Builds a dummy query graph used in selects. */

void
row_prebuild_sel_graph(
/*===================*/
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	sel_node_t*	node;

	ut_ad(prebuilt && prebuilt->trx);
	
	if (prebuilt->sel_graph == NULL) {

		node = sel_node_create(prebuilt->heap);
				
		prebuilt->sel_graph =
			que_node_get_parent(
				pars_complete_graph_for_exec(node,
							prebuilt->trx,
							prebuilt->heap));

		prebuilt->sel_graph->state = QUE_FORK_ACTIVE;
	}
}

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/*************************************************************************
Creates an query graph node of 'update' type to be used in the MySQL
interface. */

upd_node_t*
row_create_update_node_for_mysql(
/*=============================*/
				/* out, own: update node */
	dict_table_t*	table,	/* in: table to update */
	mem_heap_t*	heap)	/* in: mem heap from which allocated */
{
	upd_node_t*	node;

	node = upd_node_create(heap);
		
	node->in_mysql_interface = TRUE;
	node->is_delete = FALSE;
	node->searched_update = FALSE;
	node->select_will_do_update = FALSE;
	node->select = NULL;
	node->pcur = btr_pcur_create_for_mysql();
	node->table = table;

	node->update = upd_create(dict_table_get_n_cols(table), heap);

	node->update_n_fields = dict_table_get_n_cols(table);
	
	UT_LIST_INIT(node->columns);
	node->has_clust_rec_x_lock = TRUE;
	node->cmpl_info = 0;

	node->table_sym = NULL;
	node->col_assign_list = NULL;

	return(node);
}

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/*************************************************************************
Gets pointer to a prebuilt update vector used in updates. If the update
graph has not yet been built in the prebuilt struct, then this function
first builds it. */

upd_t*
row_get_prebuilt_update_vector(
/*===========================*/
					/* out: prebuilt update vector */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	dict_table_t*	table	= prebuilt->table;
	upd_node_t*	node;

	ut_ad(prebuilt && table && prebuilt->trx);
	
	if (prebuilt->upd_node == NULL) {

		/* Not called before for this handle: create an update node
		and query graph to the prebuilt struct */

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		node = row_create_update_node_for_mysql(table, prebuilt->heap);
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		prebuilt->upd_node = node;
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		prebuilt->upd_graph =
			que_node_get_parent(
				pars_complete_graph_for_exec(node,
							prebuilt->trx,
							prebuilt->heap));
		prebuilt->upd_graph->state = QUE_FORK_ACTIVE;
	}

	return(prebuilt->upd_node->update);
}

/*************************************************************************
Does an update or delete of a row for MySQL. */

int
row_update_for_mysql(
/*=================*/
					/* out: error code or DB_SUCCESS */
	byte*		mysql_rec,	/* in: the row to be updated, in
					the MySQL format */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	trx_savept_t	savept;
	ulint		err;
	que_thr_t*	thr;
	ibool		was_lock_wait;
	dict_index_t*	clust_index; 
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/*	ulint		ref_len; */
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	upd_node_t*	node;
	dict_table_t*	table		= prebuilt->table;
	trx_t*		trx		= prebuilt->trx;
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	ut_ad(prebuilt && trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
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	UT_NOT_USED(mysql_rec);
	
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	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) {
		fprintf(stderr,
		"InnoDB: Error: trying to free a corrupt\n"
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		"InnoDB: table handle. Magic n %lu, table name",
		(ulong) prebuilt->magic_n);
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		ut_print_name(stderr, prebuilt->trx, prebuilt->table->name);
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		putc('\n', stderr);
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		mem_analyze_corruption((byte*)prebuilt);

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		ut_error;
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	}

1103
	if (srv_created_new_raw || srv_force_recovery) {
1104
		fputs(
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		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
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		"InnoDB: with raw, and innodb_force_... is removed.\n",
			stderr);
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		return(DB_ERROR);
	}

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	trx->op_info = "updating or deleting";
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	row_mysql_delay_if_needed();

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	trx_start_if_not_started(trx);

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	node = prebuilt->upd_node;

	clust_index = dict_table_get_first_index(table);

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	if (prebuilt->pcur->btr_cur.index == clust_index) {
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		btr_pcur_copy_stored_position(node->pcur, prebuilt->pcur);
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	} else {
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		btr_pcur_copy_stored_position(node->pcur,
							prebuilt->clust_pcur);
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	}
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	ut_a(node->pcur->rel_pos == BTR_PCUR_ON);
	 	
	/* MySQL seems to call rnd_pos before updating each row it
	has cached: we can get the correct cursor position from
	prebuilt->pcur; NOTE that we cannot build the row reference
	from mysql_rec if the clustered index was automatically
	generated for the table: MySQL does not know anything about
	the row id used as the clustered index key */

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	savept = trx_savept_take(trx);
	
	thr = que_fork_get_first_thr(prebuilt->upd_graph);

	node->state = UPD_NODE_UPDATE_CLUSTERED;

	ut_ad(!prebuilt->sql_stat_start);

	que_thr_move_to_run_state_for_mysql(thr, trx);
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run_again:
	thr->run_node = node;
	thr->prev_node = node;

	row_upd_step(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);
		
		if (err == DB_RECORD_NOT_FOUND) {
			trx->error_state = DB_SUCCESS;
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			trx->op_info = "";
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			return((int) err);
		}
	
		was_lock_wait = row_mysql_handle_errors(&err, trx, thr,
								&savept);
		if (was_lock_wait) {
			goto run_again;
		}

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		trx->op_info = "";
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		return(err);
	}

	que_thr_stop_for_mysql_no_error(thr, trx);

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	if (node->is_delete) {
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		if (prebuilt->table->stat_n_rows > 0) {
			prebuilt->table->stat_n_rows--;
		}
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		srv_n_rows_deleted++;
	} else {
		srv_n_rows_updated++;
	}
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	row_update_statistics_if_needed(prebuilt->table);
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	trx->op_info = "";
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	return((int) err);
}

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/*************************************************************************
Does an unlock of a row for MySQL. */

int
row_unlock_for_mysql(
/*=================*/
					/* out: error code or DB_SUCCESS */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	rec_t*		rec;
	btr_pcur_t*	cur		= prebuilt->pcur;
	trx_t*		trx		= prebuilt->trx;
	mtr_t           mtr;
	
	ut_ad(prebuilt && trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
		
	trx->op_info = "unlock_row";
	
	if (srv_locks_unsafe_for_binlog) {
		if (trx->trx_create_lock == TRUE) {

			mtr_start(&mtr);
			
			/* Restore a cursor position and find a record */
			btr_pcur_restore_position(BTR_SEARCH_LEAF, cur, &mtr);
			rec = btr_pcur_get_rec(cur);

			if (rec) {

				lock_rec_reset_and_release_wait(rec);
			} else {
				fputs("InnoDB: Error: "
				      "Record for the lock not found\n",
				      stderr);
				mem_analyze_corruption((byte*) trx);
				ut_error;
			}

			trx->trx_create_lock = FALSE;
			mtr_commit(&mtr);
		}
		
	}
			
	trx->op_info = "";
	
	return(DB_SUCCESS);
}

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/**************************************************************************
Does a cascaded delete or set null in a foreign key operation. */

ulint
row_update_cascade_for_mysql(
/*=========================*/
				/* out: error code or DB_SUCCESS */
	que_thr_t*	thr,	/* in: query thread */
	upd_node_t*	node,	/* in: update node used in the cascade
				or set null operation */
	dict_table_t*	table)	/* in: table where we do the operation */
{
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	ulint	err;
	trx_t*	trx;
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	trx = thr_get_trx(thr);
run_again:
	thr->run_node = node;
	thr->prev_node = node;

	row_upd_step(thr);

	err = trx->error_state;

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	/* Note that the cascade node is a subnode of another InnoDB
	query graph node. We do a normal lock wait in this node, but
	all errors are handled by the parent node. */

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	if (err == DB_LOCK_WAIT) {
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		/* Handle lock wait here */
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		que_thr_stop_for_mysql(thr);

		srv_suspend_mysql_thread(thr);
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		/* Note that a lock wait may also end in a lock wait timeout,
		or this transaction is picked as a victim in selective
		deadlock resolution */

		if (trx->error_state != DB_SUCCESS) {

			return(trx->error_state);
		}

		/* Retry operation after a normal lock wait */
		
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		goto run_again;
	}

	if (err != DB_SUCCESS) {

		return(err);
	}

	if (node->is_delete) {
		if (table->stat_n_rows > 0) {
			table->stat_n_rows--;
		}

		srv_n_rows_deleted++;
	} else {
		srv_n_rows_updated++;
	}

	row_update_statistics_if_needed(table);

	return(err);
}

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/*************************************************************************
Checks if a table is such that we automatically created a clustered
index on it (on row id). */

ibool
row_table_got_default_clust_index(
/*==============================*/
	dict_table_t*	table)
{
	dict_index_t*	clust_index;

	clust_index = dict_table_get_first_index(table);

	if (dtype_get_mtype(dict_index_get_nth_type(clust_index, 0))
	 							== DATA_SYS) {
	 	return(TRUE);
	}

	return(FALSE);
}

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/*************************************************************************
Calculates the key number used inside MySQL for an Innobase index. We have
to take into account if we generated a default clustered index for the table */

ulint
row_get_mysql_key_number_for_index(
/*===============================*/
	dict_index_t*	index)
{
	dict_index_t*	ind;
	ulint		i;

	ut_a(index);

	i = 0;
	ind = dict_table_get_first_index(index->table);

	while (index != ind) {
		ind = dict_table_get_next_index(ind);
		i++;
	}

	if (row_table_got_default_clust_index(index->table)) {
		ut_a(i > 0);
		i--;
	}

	return(i);
}

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/*************************************************************************
Recovers an orphaned tmp table inside InnoDB by renaming it. In the table
name #sql becomes rsql, and "_recover_innodb_tmp_table" is catenated to
the end of name. table->name should be of the form
"dbname/rsql..._recover_innodb_tmp_table". This renames a table whose
name is "#sql..." */
static
int
row_mysql_recover_tmp_table(
/*========================*/
				/* out: error code or DB_SUCCESS */
	dict_table_t*	table,	/* in: table definition */
	trx_t*		trx)	/* in: transaction handle */
{
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	const char*	ptr	= strstr(table->name, "/rsql");
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	if (!ptr) {
		/* table name does not begin with "/rsql" */
		trx_commit_for_mysql(trx);
		return(DB_ERROR);
	}
	else {
		int	status;
		int	namelen = strlen(table->name);
		char*	old_name = mem_strdupl(table->name, namelen);
		/* replace "rsql" with "#sql" */
		old_name[ptr - table->name + 1] = '#';
		/* remove "_recover_innodb_tmp_table" suffix */
		ut_ad(namelen > (int) sizeof S_recover_innodb_tmp_table);
		ut_ad(!strcmp(old_name + namelen + 1 -
			sizeof S_recover_innodb_tmp_table,
			S_recover_innodb_tmp_table));
		old_name[namelen + 1 - sizeof S_recover_innodb_tmp_table] = 0;
		status = row_rename_table_for_mysql(old_name,
						table->name, trx);
		mem_free(old_name);
		return(status);
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	}
}

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/*************************************************************************
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Locks the data dictionary in shared mode from modifications, for performing
foreign key check, rollback, or other operation invisible to MySQL. */
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void
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row_mysql_freeze_data_dictionary(
/*=============================*/
	trx_t*	trx)	/* in: transaction */
{
	ut_a(trx->dict_operation_lock_mode == 0);
	
	rw_lock_s_lock(&dict_operation_lock);

	trx->dict_operation_lock_mode = RW_S_LATCH;
}

/*************************************************************************
Unlocks the data dictionary shared lock. */

void
row_mysql_unfreeze_data_dictionary(
/*===============================*/
	trx_t*	trx)	/* in: transaction */
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{
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	ut_a(trx->dict_operation_lock_mode == RW_S_LATCH);

	rw_lock_s_unlock(&dict_operation_lock);

	trx->dict_operation_lock_mode = 0;
}

/*************************************************************************
Locks the data dictionary exclusively for performing a table create or other
data dictionary modification operation. */

void
row_mysql_lock_data_dictionary(
/*===========================*/
	trx_t*	trx)	/* in: transaction */
{
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	ut_a(trx->dict_operation_lock_mode == 0
	     || trx->dict_operation_lock_mode == RW_X_LATCH);
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	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks or lock waits can occur then in these operations */

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	rw_lock_x_lock(&dict_operation_lock);
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	trx->dict_operation_lock_mode = RW_X_LATCH;

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	mutex_enter(&(dict_sys->mutex));
}

/*************************************************************************
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Unlocks the data dictionary exclusive lock. */
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void
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row_mysql_unlock_data_dictionary(
/*=============================*/
	trx_t*	trx)	/* in: transaction */
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{
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	ut_a(trx->dict_operation_lock_mode == RW_X_LATCH);

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	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

	mutex_exit(&(dict_sys->mutex));
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	rw_lock_x_unlock(&dict_operation_lock);
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	trx->dict_operation_lock_mode = 0;
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}

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/*************************************************************************
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Does a table creation operation for MySQL.  If the name of the table
to be created is equal with one of the predefined magic table names,
then this also starts printing the corresponding monitor output by
the master thread. */
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int
row_create_table_for_mysql(
/*=======================*/
				/* out: error code or DB_SUCCESS */
	dict_table_t*	table,	/* in: table definition */
	trx_t*		trx)	/* in: transaction handle */
{
	tab_node_t*	node;
	mem_heap_t*	heap;
	que_thr_t*	thr;
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	const char*	table_name;
	ulint		table_name_len;
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	ulint		err;

	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
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#ifdef UNIV_SYNC_DEBUG
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	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
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	ut_ad(mutex_own(&(dict_sys->mutex)));
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#endif /* UNIV_SYNC_DEBUG */
	ut_ad(trx->dict_operation_lock_mode == RW_X_LATCH);
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	if (srv_created_new_raw) {
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		fputs(
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		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
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		"InnoDB: with raw, and innodb_force_... is removed.\n",
		stderr);
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		trx_commit_for_mysql(trx);

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		return(DB_ERROR);
	}

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	trx->op_info = "creating table";
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	if (row_mysql_is_system_table(table->name)) {

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		fprintf(stderr,
    "InnoDB: Error: trying to create a MySQL system table %s of type InnoDB.\n"
    "InnoDB: MySQL system tables must be of the MyISAM type!\n",
		table->name);

		trx_commit_for_mysql(trx);

		return(DB_ERROR);
	}

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	trx_start_if_not_started(trx);

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	if (row_mysql_is_recovered_tmp_table(table->name)) {
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		/* MySQL prevents accessing of tables whose name begins
		with #sql, that is temporary tables. If mysqld crashes in
		the middle of an ALTER TABLE, we may get an orphaned
		#sql-table in the tablespace. We have here a special
		mechanism to recover such tables by renaming them to
		rsql... */
 				
		return(row_mysql_recover_tmp_table(table, trx));
	}

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	/* The table name is prefixed with the database name and a '/'.
	Certain table names starting with 'innodb_' have their special
	meaning regardless of the database name.  Thus, we need to
	ignore the database name prefix in the comparisons. */
	table_name = strchr(table->name, '/');
	ut_a(table_name);
	table_name++;
	table_name_len = strlen(table_name) + 1;
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	if (table_name_len == sizeof S_innodb_monitor
			&& !memcmp(table_name, S_innodb_monitor,
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				sizeof S_innodb_monitor)) {
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		/* Table equals "innodb_monitor":
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		start monitor prints */
 				
		srv_print_innodb_monitor = TRUE;

		/* The lock timeout monitor thread also takes care
		of InnoDB monitor prints */

		os_event_set(srv_lock_timeout_thread_event);
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	} else if (table_name_len == sizeof S_innodb_lock_monitor
			&& !memcmp(table_name, S_innodb_lock_monitor,
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				sizeof S_innodb_lock_monitor)) {
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		srv_print_innodb_monitor = TRUE;
		srv_print_innodb_lock_monitor = TRUE;
		os_event_set(srv_lock_timeout_thread_event);
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	} else if (table_name_len == sizeof S_innodb_tablespace_monitor
			&& !memcmp(table_name, S_innodb_tablespace_monitor,
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				sizeof S_innodb_tablespace_monitor)) {
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		srv_print_innodb_tablespace_monitor = TRUE;
		os_event_set(srv_lock_timeout_thread_event);
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	} else if (table_name_len == sizeof S_innodb_table_monitor
			&& !memcmp(table_name, S_innodb_table_monitor,
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				sizeof S_innodb_table_monitor)) {
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		srv_print_innodb_table_monitor = TRUE;
		os_event_set(srv_lock_timeout_thread_event);
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	} else if (table_name_len == sizeof S_innodb_mem_validate
			&& !memcmp(table_name, S_innodb_mem_validate,
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				sizeof S_innodb_mem_validate)) {
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	        /* We define here a debugging feature intended for
		developers */

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		fputs("Validating InnoDB memory:\n"
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		 "to use this feature you must compile InnoDB with\n"
		 "UNIV_MEM_DEBUG defined in univ.i and the server must be\n"
		 "quiet because allocation from a mem heap is not protected\n"
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		"by any semaphore.\n", stderr);
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#ifdef UNIV_MEM_DEBUG
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		ut_a(mem_validate());
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		fputs("Memory validated\n", stderr);
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#else /* UNIV_MEM_DEBUG */
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		fputs("Memory NOT validated (recompile with UNIV_MEM_DEBUG)\n",
			stderr);
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#endif /* UNIV_MEM_DEBUG */
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	}

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	heap = mem_heap_create(512);

	trx->dict_operation = TRUE;
	
	node = tab_create_graph_create(table, heap);

	thr = pars_complete_graph_for_exec(node, trx, heap);

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	ut_a(thr == que_fork_start_command(que_node_get_parent(thr)));
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	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		/* We have special error handling here */
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		trx->error_state = DB_SUCCESS;
		
		trx_general_rollback_for_mysql(trx, FALSE, NULL);

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		if (err == DB_OUT_OF_FILE_SPACE) {
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			fputs("InnoDB: Warning: cannot create table ", stderr);
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			ut_print_name(stderr, trx, table->name);
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			fputs(" because tablespace full\n", stderr);
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		     	row_drop_table_for_mysql(table->name, trx, FALSE);
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		} else if (err == DB_DUPLICATE_KEY) {
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	    		ut_print_timestamp(stderr);

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			fputs("  InnoDB: Error: table ", stderr);
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			ut_print_name(stderr, trx, table->name);
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			fputs(" already exists in InnoDB internal\n"
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     "InnoDB: data dictionary. Have you deleted the .frm file\n"
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     "InnoDB: and not used DROP TABLE? Have you used DROP DATABASE\n"
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     "InnoDB: for InnoDB tables in MySQL version <= 3.23.43?\n"
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     "InnoDB: See the Restrictions section of the InnoDB manual.\n"
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     "InnoDB: You can drop the orphaned table inside InnoDB by\n"
     "InnoDB: creating an InnoDB table with the same name in another\n"
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     "InnoDB: database and copying the .frm file to the current database.\n"
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     "InnoDB: Then MySQL thinks the table exists, and DROP TABLE will\n"
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     "InnoDB: succeed.\n"
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     "InnoDB: You can look for further help from\n"
     "InnoDB: http://dev.mysql.com/doc/mysql/en/"
     "InnoDB_troubleshooting_datadict.html\n", stderr);
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		}
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		/* We may also get err == DB_ERROR if the .ibd file for the
		table already exists */
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		trx->error_state = DB_SUCCESS;
	}

	que_graph_free((que_t*) que_node_get_parent(thr));
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	trx->op_info = "";
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	return((int) err);
}

/*************************************************************************
Does an index creation operation for MySQL. TODO: currently failure
to create an index results in dropping the whole table! This is no problem
currently as all indexes must be created at the same time as the table. */

int
row_create_index_for_mysql(
/*=======================*/
					/* out: error number or DB_SUCCESS */
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	dict_index_t*	index,		/* in: index definition */
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	trx_t*		trx)		/* in: transaction handle */
{
	ind_node_t*	node;
	mem_heap_t*	heap;
	que_thr_t*	thr;
	ulint		err;
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	ulint		i, j;
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#ifdef UNIV_SYNC_DEBUG
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	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
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	ut_ad(mutex_own(&(dict_sys->mutex)));
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#endif /* UNIV_SYNC_DEBUG */
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	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	
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	trx->op_info = "creating index";
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	trx_start_if_not_started(trx);

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	/* Check that the same column does not appear twice in the index.
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	Starting from 4.0.14, InnoDB should be able to cope with that, but
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	safer not to allow them. */
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	for (i = 0; i < dict_index_get_n_fields(index); i++) {
		for (j = 0; j < i; j++) {
			if (0 == ut_strcmp(
			      dict_index_get_nth_field(index, j)->name,
			      dict_index_get_nth_field(index, i)->name)) {

				ut_print_timestamp(stderr);

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				fputs("  InnoDB: Error: column ", stderr);
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				ut_print_name(stderr, trx,
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				dict_index_get_nth_field(index, i)->name);
				fputs(" appears twice in ", stderr);
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				dict_index_name_print(stderr, trx, index);
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				fputs("\n"
				"InnoDB: This is not allowed in InnoDB.\n",
					stderr);
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				err = DB_COL_APPEARS_TWICE_IN_INDEX;

				goto error_handling;
			}
		}
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		/* Check also that prefix_len < DICT_MAX_COL_PREFIX_LEN */
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		if (dict_index_get_nth_field(index, i)->prefix_len
						>= DICT_MAX_COL_PREFIX_LEN) {
			err = DB_TOO_BIG_RECORD;

			goto error_handling;
		}
	}
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	if (row_mysql_is_recovered_tmp_table(index->table_name)) {
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		return(DB_SUCCESS);
	}

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	heap = mem_heap_create(512);

	trx->dict_operation = TRUE;

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	/* Note that the space id where we store the index is inherited from
	the table in dict_build_index_def_step() in dict0crea.c. */

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	node = ind_create_graph_create(index, heap);

	thr = pars_complete_graph_for_exec(node, trx, heap);

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	ut_a(thr == que_fork_start_command(que_node_get_parent(thr)));
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	que_run_threads(thr);

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 	err = trx->error_state;

	que_graph_free((que_t*) que_node_get_parent(thr));
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error_handling:
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	if (err != DB_SUCCESS) {
		/* We have special error handling here */
		
		trx->error_state = DB_SUCCESS;

		trx_general_rollback_for_mysql(trx, FALSE, NULL);

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		row_drop_table_for_mysql(index->table_name, trx, FALSE);
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		trx->error_state = DB_SUCCESS;
	}
	
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	trx->op_info = "";
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	return((int) err);
}

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/*************************************************************************
Scans a table create SQL string and adds to the data dictionary
the foreign key constraints declared in the string. This function
should be called after the indexes for a table have been created.
Each foreign key constraint must be accompanied with indexes in
bot participating tables. The indexes are allowed to contain more
fields than mentioned in the constraint. Check also that foreign key
constraints which reference this table are ok. */

int
row_table_add_foreign_constraints(
/*==============================*/
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					/* out: error code or DB_SUCCESS */
	trx_t*		trx,		/* in: transaction */
	const char*	sql_string,	/* in: table create statement where
					foreign keys are declared like:
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				FOREIGN KEY (a, b) REFERENCES table2(c, d),
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					table2 can be written also with the
					database name before it: test.table2 */
	const char*	name)		/* in: table full name in the
					normalized form
					database_name/table_name */
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{
	ulint	err;

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#ifdef UNIV_SYNC_DEBUG
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	ut_ad(mutex_own(&(dict_sys->mutex)));
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	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
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#endif /* UNIV_SYNC_DEBUG */
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	ut_a(sql_string);
	
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	trx->op_info = "adding foreign keys";
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	trx_start_if_not_started(trx);

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	if (row_mysql_is_recovered_tmp_table(name)) {
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		return(DB_SUCCESS);
	}

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	trx->dict_operation = TRUE;

	err = dict_create_foreign_constraints(trx, sql_string, name);

	if (err == DB_SUCCESS) {
		/* Check that also referencing constraints are ok */
		err = dict_load_foreigns(name);
	}

	if (err != DB_SUCCESS) {
		/* We have special error handling here */
		
		trx->error_state = DB_SUCCESS;

		trx_general_rollback_for_mysql(trx, FALSE, NULL);

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		row_drop_table_for_mysql(name, trx, FALSE);
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		trx->error_state = DB_SUCCESS;
	}

	return((int) err);
}

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/*************************************************************************
Drops a table for MySQL as a background operation. MySQL relies on Unix
in ALTER TABLE to the fact that the table handler does not remove the
table before all handles to it has been removed. Furhermore, the MySQL's
call to drop table must be non-blocking. Therefore we do the drop table
as a background operation, which is taken care of by the master thread
in srv0srv.c. */
static
int
row_drop_table_for_mysql_in_background(
/*===================================*/
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				/* out: error code or DB_SUCCESS */
	const char*	name)	/* in: table name */
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{
	ulint	error;
	trx_t*	trx;

	trx = trx_allocate_for_background();

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/*	fputs("InnoDB: Error: Dropping table ", stderr);
	ut_print_name(stderr, name);
	fputs(" in background drop list\n", stderr); */

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  	/* Drop the table in InnoDB */

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  	error = row_drop_table_for_mysql(name, trx, FALSE);
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	if (error != DB_SUCCESS) {
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		ut_print_timestamp(stderr);
		fputs("  InnoDB: Error: Dropping table ", stderr);
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		ut_print_name(stderr, trx, name);
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		fputs(" in background drop list failed\n", stderr);
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	}
  	
	/* 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 */
	
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	log_buffer_flush_to_disk();
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  	trx_commit_for_mysql(trx);

  	trx_free_for_background(trx);

	return(DB_SUCCESS);
}

/*************************************************************************
The master thread in srv0srv.c calls this regularly to drop tables which
we must drop in background after queries to them have ended. Such lazy
dropping of tables is needed in ALTER TABLE on Unix. */

ulint
row_drop_tables_for_mysql_in_background(void)
/*=========================================*/
					/* out: how many tables dropped
					+ remaining tables in list */
{
	row_mysql_drop_t*	drop;
	dict_table_t*		table;
	ulint			n_tables;
	ulint			n_tables_dropped = 0;
loop:	
	mutex_enter(&kernel_mutex);

	if (!row_mysql_drop_list_inited) {

		UT_LIST_INIT(row_mysql_drop_list);
		row_mysql_drop_list_inited = TRUE;
	}

	drop = UT_LIST_GET_FIRST(row_mysql_drop_list);
	
	n_tables = UT_LIST_GET_LEN(row_mysql_drop_list);

	mutex_exit(&kernel_mutex);

	if (drop == NULL) {

		return(n_tables + n_tables_dropped);
	}

	mutex_enter(&(dict_sys->mutex));
	table = dict_table_get_low(drop->table_name);
	mutex_exit(&(dict_sys->mutex));

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	if (table == NULL) {
	        /* If for some reason the table has already been dropped
		through some other mechanism, do not try to drop it */

	        goto already_dropped;
	}

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	if (table->n_mysql_handles_opened > 0
				|| table->n_foreign_key_checks_running > 0) {
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		return(n_tables + n_tables_dropped);
	}

	n_tables_dropped++;
							
	row_drop_table_for_mysql_in_background(drop->table_name);

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already_dropped:
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	mutex_enter(&kernel_mutex);

	UT_LIST_REMOVE(row_mysql_drop_list, row_mysql_drop_list, drop);

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        ut_print_timestamp(stderr);
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	fprintf(stderr,
		"  InnoDB: Dropped table %s in background drop queue.\n",
		drop->table_name);
1952

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	mem_free(drop->table_name);

	mem_free(drop);

	mutex_exit(&kernel_mutex);

	goto loop;
}

/*************************************************************************
Get the background drop list length. NOTE: the caller must own the kernel
mutex! */

ulint
row_get_background_drop_list_len_low(void)
/*======================================*/
					/* out: how many tables in list */
{
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#ifdef UNIV_SYNC_DEBUG
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	ut_ad(mutex_own(&kernel_mutex));
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#endif /* UNIV_SYNC_DEBUG */
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	if (!row_mysql_drop_list_inited) {

		UT_LIST_INIT(row_mysql_drop_list);
		row_mysql_drop_list_inited = TRUE;
	}
	
	return(UT_LIST_GET_LEN(row_mysql_drop_list));
}

/*************************************************************************
Adds a table to the list of tables which the master thread drops in
background. We need this on Unix because in ALTER TABLE MySQL may call
drop table even if the table has running queries on it. */
static
void
row_add_table_to_background_drop_list(
/*==================================*/
	dict_table_t*	table)	/* in: table */
{
	row_mysql_drop_t*	drop;
	
	drop = mem_alloc(sizeof(row_mysql_drop_t));

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	drop->table_name = mem_strdup(table->name);
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	mutex_enter(&kernel_mutex);

	if (!row_mysql_drop_list_inited) {

		UT_LIST_INIT(row_mysql_drop_list);
		row_mysql_drop_list_inited = TRUE;
	}

	UT_LIST_ADD_LAST(row_mysql_drop_list, row_mysql_drop_list, drop);
	
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/*	fputs("InnoDB: Adding table ", stderr);
	ut_print_name(stderr, drop->table_name);
	fputs(" to background drop list\n", stderr); */

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	mutex_exit(&kernel_mutex);
}

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/*************************************************************************
Discards the tablespace of a table which stored in an .ibd file. Discarding
means that this function deletes the .ibd file and assigns a new table id for
the table. Also the flag table->ibd_file_missing is set TRUE.

How do we prevent crashes caused by ongoing operations on the table? Old
operations could try to access non-existent pages.

1) SQL queries, INSERT, SELECT, ...: we must get an exclusive MySQL table lock
on the table before we can do DISCARD TABLESPACE. Then there are no running
queries on the table.
2) Purge and rollback: we assign a new table id for the table. Since purge and
rollback look for the table based on the table id, they see the table as
'dropped' and discard their operations.
3) Insert buffer: we remove all entries for the tablespace in the insert
buffer tree; as long as the tablespace mem object does not exist, ongoing
insert buffer page merges are discarded in buf0rea.c. If we recreate the
tablespace mem object with IMPORT TABLESPACE later, then the tablespace will
have the same id, but the tablespace_version field in the mem object is
different, and ongoing old insert buffer page merges get discarded.
4) Linear readahead and random readahead: we use the same method as in 3) to
discard ongoing operations. */

int
row_discard_tablespace_for_mysql(
/*=============================*/
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				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: table name */
	trx_t*		trx)	/* in: transaction handle */
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{
	dulint		new_id;
	dict_table_t*	table;
	que_thr_t*	thr;
	que_t*		graph			= NULL;
	ibool		success;
	ulint		err;
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	char*		buf;

	static const char discard_tablespace_proc1[] =
	"PROCEDURE DISCARD_TABLESPACE_PROC () IS\n"
	"old_id CHAR;\n"
	"new_id CHAR;\n"
	"new_id_low INT;\n"
	"new_id_high INT;\n"
	"table_name CHAR;\n"
	"BEGIN\n"
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	"table_name := '";
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	static const char discard_tablespace_proc2[] =
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	"';\n"
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	"new_id_high := %lu;\n"
	"new_id_low := %lu;\n"
   "new_id := CONCAT(TO_BINARY(new_id_high, 4), TO_BINARY(new_id_low, 4));\n"
	"SELECT ID INTO old_id\n"
	"FROM SYS_TABLES\n"
	"WHERE NAME = table_name;\n"
	"IF (SQL %% NOTFOUND) THEN\n"
	"	COMMIT WORK;\n"
	"	RETURN;\n"
	"END IF;\n"
	"UPDATE SYS_TABLES SET ID = new_id\n"
	"WHERE ID = old_id;\n"
	"UPDATE SYS_COLUMNS SET TABLE_ID = new_id\n"
	"WHERE TABLE_ID = old_id;\n"
	"UPDATE SYS_INDEXES SET TABLE_ID = new_id\n"
	"WHERE TABLE_ID = old_id;\n"
	"COMMIT WORK;\n"
	"END;\n";
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	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());

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	trx->op_info = "discarding tablespace";
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	trx_start_if_not_started(trx);

	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

	row_mysql_lock_data_dictionary(trx);

	table = dict_table_get_low(name);

	if (!table) {
		err = DB_TABLE_NOT_FOUND;

		goto funct_exit;
	}

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	if (table->space == 0) {
		ut_print_timestamp(stderr);
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		fputs("  InnoDB: Error: table ", stderr);
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		ut_print_name(stderr, trx, name);
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		fputs("\n"
"InnoDB: is in the system tablespace 0 which cannot be discarded\n", stderr);
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		err = DB_ERROR;

		goto funct_exit;
	}

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	new_id = dict_hdr_get_new_id(DICT_HDR_TABLE_ID);

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	buf = mem_alloc((sizeof discard_tablespace_proc1) +
			(sizeof discard_tablespace_proc2) +
			20 + ut_strlenq(name, '\''));
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	memcpy(buf, discard_tablespace_proc1, sizeof discard_tablespace_proc1);
	sprintf(ut_strcpyq(buf + (sizeof discard_tablespace_proc1 - 1),
			'\'', name),
		discard_tablespace_proc2,
		(ulong) ut_dulint_get_high(new_id),
		(ulong) ut_dulint_get_low(new_id));
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	graph = pars_sql(buf);

	ut_a(graph);

	graph->trx = trx;
	trx->graph = NULL;

	graph->fork_type = QUE_FORK_MYSQL_INTERFACE;

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	ut_a(thr = que_fork_start_command(graph));
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	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		trx->error_state = DB_SUCCESS;
		trx_general_rollback_for_mysql(trx, FALSE, NULL);
		trx->error_state = DB_SUCCESS;
	} else {
		dict_table_change_id_in_cache(table, new_id);

		success = fil_discard_tablespace(table->space);

		if (!success) {
			trx->error_state = DB_SUCCESS;
			trx_general_rollback_for_mysql(trx, FALSE, NULL);
			trx->error_state = DB_SUCCESS;

			err = DB_ERROR;
		} else {
			/* Set the flag which tells that now it is legal to
			IMPORT a tablespace for this table */
			table->tablespace_discarded = TRUE;
			table->ibd_file_missing = TRUE;
		}
	}
funct_exit:	
	row_mysql_unlock_data_dictionary(trx);

	if (graph) {
		que_graph_free(graph);
	}

  	trx_commit_for_mysql(trx);

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	trx->op_info = "";
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	return((int) err);
}

/*********************************************************************
Imports a tablespace. The space id in the .ibd file must match the space id
of the table in the data dictionary. */

int
row_import_tablespace_for_mysql(
/*============================*/
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				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: table name */
	trx_t*		trx)	/* in: transaction handle */
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{
	dict_table_t*	table;
	ibool		success;
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	dulint		current_lsn;
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	ulint		err		= DB_SUCCESS;

	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());

	trx_start_if_not_started(trx);

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	trx->op_info = "importing tablespace";
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	current_lsn = log_get_lsn();
	
	/* It is possible, though very improbable, that the lsn's in the
	tablespace to be imported have risen above the current system lsn, if
	a lengthy purge, ibuf merge, or rollback was performed on a backup
	taken with ibbackup. If that is the case, reset page lsn's in the
	file. We assume that mysqld was shut down after it performed these
	cleanup operations on the .ibd file, so that it stamped the latest lsn
	to the FIL_PAGE_FILE_FLUSH_LSN in the first page of the .ibd file.

	TODO: reset also the trx id's in clustered index records and write
	a new space id to each data page. That would allow us to import clean
	.ibd files from another MySQL installation. */

	success = fil_reset_too_high_lsns(name, current_lsn);

	if (!success) {
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		ut_print_timestamp(stderr);
		fputs("  InnoDB: Error: cannot reset lsn's in table ", stderr);
		ut_print_name(stderr, trx, name);
		fputs("\n"
		"InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n", stderr);

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		err = DB_ERROR;

		row_mysql_lock_data_dictionary(trx);

		goto funct_exit;
	}

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	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

	row_mysql_lock_data_dictionary(trx);

	table = dict_table_get_low(name);

	if (!table) {
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		ut_print_timestamp(stderr);
		fputs("  InnoDB: table ", stderr);
		ut_print_name(stderr, trx, name);
		fputs("\n"
"InnoDB: does not exist in the InnoDB data dictionary\n"
"InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n",
		stderr);

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		err = DB_TABLE_NOT_FOUND;

		goto funct_exit;
	}

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	if (table->space == 0) {
		ut_print_timestamp(stderr);
2253
		fputs("  InnoDB: Error: table ", stderr);
2254
		ut_print_name(stderr, trx, name);
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		fputs("\n"
"InnoDB: is in the system tablespace 0 which cannot be imported\n", stderr);
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		err = DB_ERROR;

		goto funct_exit;
	}

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	if (!table->tablespace_discarded) {
		ut_print_timestamp(stderr);
2264
		fputs(
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2265
"  InnoDB: Error: you are trying to IMPORT a tablespace\n"
2266
"InnoDB: ", stderr);
2267
		ut_print_name(stderr, trx, name);
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		fputs(", though you have not called DISCARD on it yet\n"
"InnoDB: during the lifetime of the mysqld process!\n", stderr);
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		err = DB_ERROR;

		goto funct_exit;
	}

	/* Play safe and remove all insert buffer entries, though we should
	have removed them already when DISCARD TABLESPACE was called */

	ibuf_delete_for_discarded_space(table->space);

	success = fil_open_single_table_tablespace(table->space, table->name);

	if (success) {
		table->ibd_file_missing = FALSE;
		table->tablespace_discarded = FALSE;
	} else {
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		if (table->ibd_file_missing) {
			ut_print_timestamp(stderr);
			fputs(
"  InnoDB: cannot find of open in the database directory the .ibd file of\n"
"InnoDB: table ", stderr);
			ut_print_name(stderr, trx, name);
			fputs("\n"
"InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n",
			stderr);
		}

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		err = DB_ERROR;
	}

funct_exit:	
	row_mysql_unlock_data_dictionary(trx);

  	trx_commit_for_mysql(trx);

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	trx->op_info = "";
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	return((int) err);
}

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/*************************************************************************
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Drops a table for MySQL.  If the name of the table to be dropped is equal
with one of the predefined magic table names, then this also stops printing
the corresponding monitor output by the master thread. */
2315 2316 2317 2318

int
row_drop_table_for_mysql(
/*=====================*/
2319 2320 2321 2322
				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: table name */
	trx_t*		trx,	/* in: transaction handle */
	ibool		drop_db)/* in: TRUE=dropping whole database */
2323
{
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	dict_foreign_t*	foreign;
2325
	dict_table_t*	table;
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	ulint		space_id;
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	que_thr_t*	thr;
	que_t*		graph;
	ulint		err;
2330
	const char*	table_name;
2331
	ulint		namelen;
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	char*		dir_path_of_temp_table	= NULL;
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	ibool		success;
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	ibool		locked_dictionary	= FALSE;
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	char*		quoted_name;
	char*		sql;
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	/* We use the private SQL parser of Innobase to generate the
	query graphs needed in deleting the dictionary data from system
	tables in Innobase. Deleting a row from SYS_INDEXES table also
	frees the file segments of the B-tree associated with the index. */
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2342

2343
	static const char str1[] =
2344
	"PROCEDURE DROP_TABLE_PROC () IS\n"
2345 2346
	"table_name CHAR;\n"
	"sys_foreign_id CHAR;\n"
2347 2348
	"table_id CHAR;\n"
	"index_id CHAR;\n"
2349
	"foreign_id CHAR;\n"
2350 2351
	"found INT;\n"
	"BEGIN\n"
2352 2353 2354
	"table_name := ";
	static const char str2[] =
	";\n"
2355 2356 2357
	"SELECT ID INTO table_id\n"
	"FROM SYS_TABLES\n"
	"WHERE NAME = table_name;\n"
2358 2359 2360 2361 2362
	"IF (SQL % NOTFOUND) THEN\n"
	"	COMMIT WORK;\n"
	"	RETURN;\n"
	"END IF;\n"
	"found := 1;\n"
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377
	"SELECT ID INTO sys_foreign_id\n"
	"FROM SYS_TABLES\n"
	"WHERE NAME = 'SYS_FOREIGN';\n"
	"IF (SQL % NOTFOUND) THEN\n"
	"	found := 0;\n"
	"END IF;\n"
	"IF (table_name = 'SYS_FOREIGN') THEN\n"
	"	found := 0;\n"
	"END IF;\n"
	"IF (table_name = 'SYS_FOREIGN_COLS') THEN\n"
	"	found := 0;\n"
	"END IF;\n"
	"WHILE found = 1 LOOP\n"
	"	SELECT ID INTO foreign_id\n"
	"	FROM SYS_FOREIGN\n"
2378 2379
	"	WHERE FOR_NAME = table_name\n"
        "             AND TO_BINARY(FOR_NAME) = TO_BINARY(table_name);\n"
2380 2381 2382 2383 2384 2385 2386 2387
	"	IF (SQL % NOTFOUND) THEN\n"
	"		found := 0;\n"
	"	ELSE"
	"		DELETE FROM SYS_FOREIGN_COLS WHERE ID = foreign_id;\n"
	"		DELETE FROM SYS_FOREIGN WHERE ID = foreign_id;\n"
	"	END IF;\n"
	"END LOOP;\n"
	"found := 1;\n"
2388 2389 2390 2391 2392 2393 2394 2395
	"WHILE found = 1 LOOP\n"
	"	SELECT ID INTO index_id\n"
	"	FROM SYS_INDEXES\n"
	"	WHERE TABLE_ID = table_id;\n"	
	"	IF (SQL % NOTFOUND) THEN\n"
	"		found := 0;\n"
	"	ELSE"
	"		DELETE FROM SYS_FIELDS WHERE INDEX_ID = index_id;\n"
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	"		DELETE FROM SYS_INDEXES WHERE ID = index_id\n"
	"					 AND TABLE_ID = table_id;\n"
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	"	END IF;\n"
	"END LOOP;\n"
	"DELETE FROM SYS_COLUMNS WHERE TABLE_ID = table_id;\n"
	"DELETE FROM SYS_TABLES WHERE ID = table_id;\n"
	"COMMIT WORK;\n"
	"END;\n";

2405 2406 2407 2408 2409 2410 2411 2412 2413
	ut_a(name != NULL);

	if (srv_created_new_raw) {
		fputs(
		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
		"InnoDB: with raw, and innodb_force_... is removed.\n",
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2414
                stderr);
2415 2416 2417 2418

		return(DB_ERROR);
	}

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2419
	trx->op_info = "dropping table";
2420 2421

	trx_start_if_not_started(trx);
2422

2423 2424 2425 2426 2427 2428 2429 2430
	/* The table name is prefixed with the database name and a '/'.
	Certain table names starting with 'innodb_' have their special
	meaning regardless of the database name.  Thus, we need to
	ignore the database name prefix in the comparisons. */
	table_name = strchr(name, '/');
	ut_a(table_name);
	table_name++;
	namelen = strlen(table_name) + 1;
2431

2432
	if (namelen == sizeof S_innodb_monitor
2433
			&& !memcmp(table_name, S_innodb_monitor,
2434
				sizeof S_innodb_monitor)) {
2435

2436 2437 2438 2439 2440 2441
		/* Table name equals "innodb_monitor":
		stop monitor prints */
 				
		srv_print_innodb_monitor = FALSE;
		srv_print_innodb_lock_monitor = FALSE;
	} else if (namelen == sizeof S_innodb_lock_monitor
2442
			&& !memcmp(table_name, S_innodb_lock_monitor,
2443 2444 2445 2446
				sizeof S_innodb_lock_monitor)) {
		srv_print_innodb_monitor = FALSE;
		srv_print_innodb_lock_monitor = FALSE;
	} else if (namelen == sizeof S_innodb_tablespace_monitor
2447
			&& !memcmp(table_name, S_innodb_tablespace_monitor,
2448
				sizeof S_innodb_tablespace_monitor)) {
2449

2450 2451
		srv_print_innodb_tablespace_monitor = FALSE;
	} else if (namelen == sizeof S_innodb_table_monitor
2452
			&& !memcmp(table_name, S_innodb_table_monitor,
2453
				sizeof S_innodb_table_monitor)) {
2454

2455 2456 2457 2458 2459 2460 2461 2462 2463
		srv_print_innodb_table_monitor = FALSE;
	}

	quoted_name = mem_strdupq(name, '\'');
	namelen = strlen(quoted_name);
	sql = mem_alloc((sizeof str1) + (sizeof str2) - 2 + 1 + namelen);
	memcpy(sql, str1, (sizeof str1) - 1);
	memcpy(sql + (sizeof str1) - 1, quoted_name, namelen);
	memcpy(sql + (sizeof str1) - 1 + namelen, str2, sizeof str2);
2464
	mem_free(quoted_name);
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2465

2466 2467 2468
	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

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2469
	if (trx->dict_operation_lock_mode != RW_X_LATCH) {
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2470 2471
		/* Prevent foreign key checks etc. while we are dropping the
		table */
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2472

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2473 2474 2475
		row_mysql_lock_data_dictionary(trx);

		locked_dictionary = TRUE;
2476 2477
	}

2478
#ifdef UNIV_SYNC_DEBUG
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2479 2480
	ut_ad(mutex_own(&(dict_sys->mutex)));
	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
2481
#endif /* UNIV_SYNC_DEBUG */
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2482
	
2483
	graph = pars_sql(sql);
2484 2485

	ut_a(graph);
2486
	mem_free(sql);
2487 2488 2489 2490 2491 2492 2493 2494 2495 2496

	graph->trx = trx;
	trx->graph = NULL;

	graph->fork_type = QUE_FORK_MYSQL_INTERFACE;

	table = dict_table_get_low(name);

	if (!table) {
		err = DB_TABLE_NOT_FOUND;
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2497
	    	ut_print_timestamp(stderr);
2498

2499
		fputs("  InnoDB: Error: table ", stderr);
2500
		ut_print_name(stderr, trx, name);
2501
		fputs(" does not exist in the InnoDB internal\n"
2502 2503
     	"InnoDB: data dictionary though MySQL is trying to drop it.\n"
     	"InnoDB: Have you copied the .frm file of the table to the\n"
2504
	"InnoDB: MySQL database directory from another database?\n"
2505 2506 2507
	"InnoDB: You can look for further help from\n"
	"InnoDB: http://dev.mysql.com/doc/mysql/en/"
	"InnoDB_troubleshooting_datadict.html\n", stderr);
2508 2509 2510
		goto funct_exit;
	}

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2511 2512 2513
	/* Check if the table is referenced by foreign key constraints from
	some other table (not the table itself) */

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2514 2515
	foreign = UT_LIST_GET_FIRST(table->referenced_list);
	
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2516 2517 2518 2519
	while (foreign && foreign->foreign_table == table) {
		foreign = UT_LIST_GET_NEXT(referenced_list, foreign);
	}

2520 2521 2522
	if (foreign && trx->check_foreigns &&
		!(drop_db && dict_tables_have_same_db(
			name, foreign->foreign_table_name))) {
2523
		FILE*	ef	= dict_foreign_err_file;
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2524 2525 2526 2527 2528 2529 2530

		/* We only allow dropping a referenced table if
		FOREIGN_KEY_CHECKS is set to 0 */

		err = DB_CANNOT_DROP_CONSTRAINT;

		mutex_enter(&dict_foreign_err_mutex);
2531 2532 2533 2534
		rewind(ef);
		ut_print_timestamp(ef);

		fputs("  Cannot drop table ", ef);
2535
		ut_print_name(ef, trx, name);
2536 2537
		fputs("\n"
			"because it is referenced by ", ef);
2538
		ut_print_name(ef, trx, foreign->foreign_table_name);
2539
		putc('\n', ef);
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2540 2541 2542 2543 2544
		mutex_exit(&dict_foreign_err_mutex);

		goto funct_exit;
	}

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2545
	if (table->n_mysql_handles_opened > 0) {
2546

2547
	        ut_print_timestamp(stderr);
2548 2549
		fputs("	 InnoDB: Warning: MySQL is trying to drop table ",
			stderr);
2550
		ut_print_name(stderr, trx, table->name);
2551
		fputs("\n"
2552 2553
		  "InnoDB: though there are still open handles to it.\n"
		  "InnoDB: Adding the table to the background drop queue.\n",
2554
			stderr);
2555

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2556
		row_add_table_to_background_drop_list(table);
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2557

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2558
		err = DB_SUCCESS;
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2559

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2560
		goto funct_exit;
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2561
	}
2562

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2563
	if (table->n_foreign_key_checks_running > 0) {
2564

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	        ut_print_timestamp(stderr);
2566
		fputs("	 InnoDB: You are trying to drop table ", stderr);
2567
		ut_print_name(stderr, trx, table->name);
2568
		fputs("\n"
2569 2570
		 "InnoDB: though there is a foreign key check running on it.\n"
		 "InnoDB: Adding the table to the background drop queue.\n",
2571
			stderr);
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		row_add_table_to_background_drop_list(table);

		err = DB_SUCCESS;

		goto funct_exit;
	}
	
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	/* Remove any locks there are on the table or its records */
	
	lock_reset_all_on_table(table);

2584 2585 2586
	trx->dict_operation = TRUE;
	trx->table_id = table->id;

2587
	ut_a(thr = que_fork_start_command(graph));
2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599

	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		ut_a(err == DB_OUT_OF_FILE_SPACE);

		err = DB_MUST_GET_MORE_FILE_SPACE;
		
		row_mysql_handle_errors(&err, trx, thr, NULL);

2600
		ut_error;
2601
	} else {
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		ibool		is_path;
		const char*	name_or_path;

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2605
		space_id = table->space;
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2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
		
		if (table->dir_path_of_temp_table != NULL) {
			dir_path_of_temp_table =
				mem_strdup(table->dir_path_of_temp_table);
			is_path = TRUE;
			name_or_path = dir_path_of_temp_table;
		} else {
			is_path = FALSE;
			name_or_path = name;
		}

2617
		dict_table_remove_from_cache(table);
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2618 2619 2620

		if (dict_load_table(name) != NULL) {
			ut_print_timestamp(stderr);
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2621
			fputs("  InnoDB: Error: not able to remove table ",
2622
				stderr);
2623
			ut_print_name(stderr, trx, name);
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2624
			fputs(" from the dictionary cache!\n", stderr);
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			err = DB_ERROR;
		}

		/* Do not drop possible .ibd tablespace if something went
		wrong: we do not want to delete valuable data of the user */

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		if (err == DB_SUCCESS && space_id > 0) {
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			if (!fil_space_for_table_exists_in_mem(space_id,
								name_or_path,
								is_path,
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2635
								FALSE, TRUE)) {
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				err = DB_SUCCESS;

				fprintf(stderr,
"InnoDB: We removed now the InnoDB internal data dictionary entry\n"
"InnoDB: of table ");	
				ut_print_name(stderr, trx, name);
				fprintf(stderr, ".\n");
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2643 2644 2645

				goto funct_exit;
			}
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2646

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			success = fil_delete_tablespace(space_id);

			if (!success) {
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2650 2651 2652 2653 2654 2655
				fprintf(stderr,
"InnoDB: We removed now the InnoDB internal data dictionary entry\n"
"InnoDB: of table ");	
				ut_print_name(stderr, trx, name);
				fprintf(stderr, ".\n");

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2656 2657
				ut_print_timestamp(stderr);
				fprintf(stderr,
2658 2659
"  InnoDB: Error: not able to delete tablespace %lu of table ",
					(ulong) space_id);
2660
				ut_print_name(stderr, trx, name);
2661
				fputs("!\n", stderr);
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2662 2663
				err = DB_ERROR;
			}
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2664
		}
2665
	}
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funct_exit:
2667

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2668 2669
	if (locked_dictionary) {
		row_mysql_unlock_data_dictionary(trx);	
2670 2671
	}

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heikki@hundin.mysql.fi committed
2672 2673 2674 2675
	if (dir_path_of_temp_table) {
		mem_free(dir_path_of_temp_table);
	}

2676 2677
	que_graph_free(graph);
	
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2678 2679
  	trx_commit_for_mysql(trx);

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2680
	trx->op_info = "";
2681

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2682 2683
	srv_wake_master_thread();

2684 2685 2686
	return((int) err);
}

2687 2688 2689 2690 2691 2692
/*************************************************************************
Drops a database for MySQL. */

int
row_drop_database_for_mysql(
/*========================*/
2693 2694 2695
				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: database name which ends to '/' */
	trx_t*		trx)	/* in: transaction handle */
2696
{
2697
        dict_table_t* table;
2698 2699
	char*	table_name;
	int	err	= DB_SUCCESS;
2700
	ulint	namelen	= strlen(name);
2701 2702 2703
	
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	ut_a(name != NULL);
2704
	ut_a(name[namelen - 1] == '/');
2705
	
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2706
	trx->op_info = "dropping database";
2707
	
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
2708
	trx_start_if_not_started(trx);
2709
loop:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2710
	row_mysql_lock_data_dictionary(trx);
2711

2712
	while ((table_name = dict_get_first_table_name_in_db(name))) {
2713
		ut_a(memcmp(table_name, name, namelen) == 0);
2714

2715 2716 2717 2718 2719 2720 2721 2722
		table = dict_table_get_low(table_name);

		ut_a(table);

		/* Wait until MySQL does not have any queries running on
		the table */

		if (table->n_mysql_handles_opened > 0) {
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2723
			row_mysql_unlock_data_dictionary(trx);
2724

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heikki@hundin.mysql.fi committed
2725
			ut_print_timestamp(stderr);
2726 2727
			fputs(
	"  InnoDB: Warning: MySQL is trying to drop database ", stderr);
2728
			ut_print_name(stderr, trx, name);
2729 2730
			fputs("\n"
	"InnoDB: though there are still open handles to table ", stderr);
2731
			ut_print_name(stderr, trx, table_name);
2732
			fputs(".\n", stderr);
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2733 2734 2735 2736

		        os_thread_sleep(1000000);

		        mem_free(table_name);
2737 2738 2739 2740

		        goto loop;
		}

2741
		err = row_drop_table_for_mysql(table_name, trx, TRUE);
2742 2743 2744 2745

		mem_free(table_name);

		if (err != DB_SUCCESS) {
2746
			fputs("InnoDB: DROP DATABASE ", stderr);
2747
			ut_print_name(stderr, trx, name);
2748 2749
			fprintf(stderr, " failed with error %lu for table ",
				(ulint) err);
2750
			ut_print_name(stderr, trx, table_name);
2751
			putc('\n', stderr);
2752 2753 2754 2755
			break;
		}
	}

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heikki@hundin.mysql.fi committed
2756
	row_mysql_unlock_data_dictionary(trx);
2757
	
2758 2759
	trx_commit_for_mysql(trx);

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2760
	trx->op_info = "";
2761 2762 2763 2764

	return(err);
}

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2765 2766 2767 2768 2769 2770 2771
/*************************************************************************
Checks if a table name contains the string "/#sql" which denotes temporary
tables in MySQL. */
static
ibool
row_is_mysql_tmp_table_name(
/*========================*/
2772 2773 2774
				/* out: TRUE if temporary table */
	const char*	name)	/* in: table name in the form
				'database/tablename' */
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2775
{
2776
	return(strstr(name, "/#sql") != NULL);
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2777 2778
}

2779 2780 2781 2782 2783 2784
/*************************************************************************
Renames a table for MySQL. */

int
row_rename_table_for_mysql(
/*=======================*/
2785 2786 2787 2788
					/* out: error code or DB_SUCCESS */
	const char*	old_name,	/* in: old table name */
	const char*	new_name,	/* in: new table name */
	trx_t*		trx)		/* in: transaction handle */
2789 2790 2791
{
	dict_table_t*	table;
	que_thr_t*	thr;
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2792
	que_t*		graph			= NULL;
2793
	ulint		err;
2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
	/* We use the private SQL parser of Innobase to generate the
	query graphs needed in deleting the dictionary data from system
	tables in Innobase. Deleting a row from SYS_INDEXES table also
	frees the file segments of the B-tree associated with the index. */
	static const char str1[] =
	"PROCEDURE RENAME_TABLE_PROC () IS\n"
	"new_table_name CHAR;\n"
	"old_table_name CHAR;\n"
	"gen_constr_prefix CHAR;\n"
	"new_db_name CHAR;\n"
	"foreign_id CHAR;\n"
	"new_foreign_id CHAR;\n"
	"old_db_name_len INT;\n"
	"old_t_name_len INT;\n"
	"new_db_name_len INT;\n"
	"id_len INT;\n"
	"found INT;\n"
	"BEGIN\n"
	"new_table_name := '";
	static const char str2[] =
	"';\nold_table_name := '";
	static const char str3[] =
	"';\n"
	"UPDATE SYS_TABLES SET NAME = new_table_name\n"
	"WHERE NAME = old_table_name;\n";
	static const char str4a1[] = /* drop some constraints of tmp tables */
	"DELETE FROM SYS_FOREIGN_COLS WHERE ID = '";
	static const char str4a2[] = "';\n"
	"DELETE FROM SYS_FOREIGN WHERE ID = '";
	static const char str4a3[] = "';\n";
	static const char str4b[] = /* rename all constraints */
	"found := 1;\n"
	"old_db_name_len := INSTR(old_table_name, '/') - 1;\n"
	"new_db_name_len := INSTR(new_table_name, '/') - 1;\n"
	"new_db_name := SUBSTR(new_table_name, 0, new_db_name_len);\n"
	"old_t_name_len := LENGTH(old_table_name);\n"
	"gen_constr_prefix := CONCAT(old_table_name, '_ibfk_');\n"
	"WHILE found = 1 LOOP\n"
	"	SELECT ID INTO foreign_id\n"
	"	FROM SYS_FOREIGN\n"
2834 2835
	"	WHERE FOR_NAME = old_table_name\n"
	"	      AND TO_BINARY(FOR_NAME) = TO_BINARY(old_table_name);\n"
2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867
	"	IF (SQL % NOTFOUND) THEN\n"
	"	 found := 0;\n"
	"	ELSE\n"
	"	 UPDATE SYS_FOREIGN\n"
	"	 SET FOR_NAME = new_table_name\n"
	"	 WHERE ID = foreign_id;\n"
	"	 id_len := LENGTH(foreign_id);\n"
	"	 IF (INSTR(foreign_id, '/') > 0) THEN\n"
	"	 	IF (INSTR(foreign_id,\n"
	"				gen_constr_prefix) > 0)\n"
	"		THEN\n"
	"		  new_foreign_id :=\n"
	"		    CONCAT(new_table_name,\n"
	"			SUBSTR(foreign_id, old_t_name_len,\n"
	"			      	 id_len - old_t_name_len));\n"
	"		ELSE\n"
	"		  new_foreign_id :=\n"
	"		    CONCAT(new_db_name,\n"
	"			SUBSTR(foreign_id,\n"
	"				old_db_name_len,\n"
	"				 id_len - old_db_name_len));\n"
	"		END IF;\n"
	"		UPDATE SYS_FOREIGN\n"
	"		SET ID = new_foreign_id\n"
	"		WHERE ID = foreign_id;\n"
	"		UPDATE SYS_FOREIGN_COLS\n"
	"		SET ID = new_foreign_id\n"
	"		WHERE ID = foreign_id;\n"
	"	 END IF;\n"
	"	END IF;\n"
	"END LOOP;\n"
	"UPDATE SYS_FOREIGN SET REF_NAME = new_table_name\n"
2868 2869
	"WHERE REF_NAME = old_table_name\n"
	"      AND TO_BINARY(REF_NAME) = TO_BINARY(old_table_name);\n";
2870 2871 2872
	static const char str5[] =
	"END;\n";

heikki@hundin.mysql.fi's avatar
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2873
	mem_heap_t*	heap			= NULL;
2874
	const char**	constraints_to_drop	= NULL;
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2875
	ulint		n_constraints_to_drop	= 0;
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heikki@hundin.mysql.fi committed
2876
        ibool           recovering_temp_table   = FALSE;
2877
	ulint		len;
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heikki@hundin.mysql.fi committed
2878
	ulint		i;
monty@mishka.local's avatar
monty@mishka.local committed
2879
        ibool		success;
2880 2881 2882 2883
	/* length of database name; 0 if not renaming to a temporary table */
	ulint		db_name_len;
	char*		sql;
	char*		sqlend;
2884 2885 2886 2887 2888

	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	ut_a(old_name != NULL);
	ut_a(new_name != NULL);

2889
	if (srv_created_new_raw || srv_force_recovery) {
2890
		fputs(
2891 2892 2893 2894
		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
2895 2896
		"InnoDB: with raw, and innodb_force_... is removed.\n",
		stderr);
2897

heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
2898 2899 2900
  		trx_commit_for_mysql(trx);
		return(DB_ERROR);
	}
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2901
	
2902
	if (row_mysql_is_system_table(new_name)) {
heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
2903 2904 2905 2906 2907 2908 2909
	    	
		fprintf(stderr,
    "InnoDB: Error: trying to create a MySQL system table %s of type InnoDB.\n"
    "InnoDB: MySQL system tables must be of the MyISAM type!\n",
		new_name);

  		trx_commit_for_mysql(trx);
2910 2911 2912
		return(DB_ERROR);
	}

marko@hundin.mysql.fi's avatar
marko@hundin.mysql.fi committed
2913
	trx->op_info = "renaming table";
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
2914
	trx_start_if_not_started(trx);
2915

2916
	if (row_mysql_is_recovered_tmp_table(new_name)) {
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2917

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heikki@hundin.mysql.fi committed
2918
                recovering_temp_table = TRUE;
2919 2920 2921
        } else {
		/* Serialize data dictionary operations with dictionary mutex:
		no deadlocks can occur then in these operations */
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2922 2923 2924

		row_mysql_lock_data_dictionary(trx);
	}
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2925 2926 2927 2928 2929

	table = dict_table_get_low(old_name);

	if (!table) {
		err = DB_TABLE_NOT_FOUND;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2930 2931
	    	ut_print_timestamp(stderr);

2932
                fputs("  InnoDB: Error: table ", stderr);
2933
                ut_print_name(stderr, trx, old_name);
2934
                fputs(" does not exist in the InnoDB internal\n"
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2935 2936 2937 2938
     	"InnoDB: data dictionary though MySQL is trying to rename the table.\n"
     	"InnoDB: Have you copied the .frm file of the table to the\n"
	"InnoDB: MySQL database directory from another database?\n"
	"InnoDB: You can look for further help from section 15.1 of\n"
2939
        "InnoDB: http://www.innodb.com/ibman.php\n", stderr);
heikki@hundin.mysql.fi's avatar
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2940 2941 2942 2943 2944 2945
		goto funct_exit;
	}

	if (table->ibd_file_missing) {
		err = DB_TABLE_NOT_FOUND;
	    	ut_print_timestamp(stderr);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2946

2947
                fputs("  InnoDB: Error: table ", stderr);
2948
                ut_print_name(stderr, trx, old_name);
2949 2950
                fputs(
	" does not have an .ibd file in the database directory.\n"
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2951
	"InnoDB: You can look for further help from section 15.1 of\n"
2952
        "InnoDB: http://www.innodb.com/ibman.php\n", stderr);
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heikki@hundin.mysql.fi committed
2953 2954 2955
		goto funct_exit;
	}

2956 2957 2958
	/* calculate the length of the SQL string */
	len = (sizeof str1) + (sizeof str2) + (sizeof str3) + (sizeof str5) - 4
		+ ut_strlenq(new_name, '\'') + ut_strlenq(old_name, '\'');
2959

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heikki@hundin.mysql.fi committed
2960
	if (row_is_mysql_tmp_table_name(new_name)) {
2961
		db_name_len = dict_get_db_name_len(old_name) + 1;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2962

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2963 2964 2965 2966 2967
		/* MySQL is doing an ALTER TABLE command and it renames the
		original table to a temporary table name. We want to preserve
		the original foreign key constraint definitions despite the
		name change. An exception is those constraints for which
		the ALTER TABLE contained DROP FOREIGN KEY <foreign key id>.*/
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heikki@hundin.mysql.fi committed
2968

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heikki@hundin.mysql.fi committed
2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979
		heap = mem_heap_create(100);
		
		err = dict_foreign_parse_drop_constraints(heap, trx,
					table,
					&n_constraints_to_drop,
					&constraints_to_drop);
		if (err != DB_SUCCESS) {

			goto funct_exit;
		}
		
2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008
		/* reserve space for all database names */
		len += 2 * n_constraints_to_drop
			* (ut_strlenq(old_name, '\'')
			- ut_strlenq(old_name + db_name_len, '\''));

		for (i = 0; i < n_constraints_to_drop; i++) {
			ulint	addlen
				= 2 * ut_strlenq(constraints_to_drop[i], '\'')
				+ ((sizeof str4a1) + (sizeof str4a2)
				+ (sizeof str4a3) - 3);
			if (!strchr(constraints_to_drop[i], '/')) {
				addlen *= 2;
			}
			len += addlen;
		}
	} else {
		db_name_len = 0;
		len += (sizeof str4b) - 1;
	}

	sql = sqlend = mem_alloc(len + 1);
	memcpy(sql, str1, (sizeof str1) - 1);
	sqlend += (sizeof str1) - 1;
	sqlend = ut_strcpyq(sqlend, '\'', new_name);
	memcpy(sqlend, str2, (sizeof str2) - 1);
	sqlend += (sizeof str2) - 1;
	sqlend = ut_strcpyq(sqlend, '\'', old_name);
	memcpy(sqlend, str3, (sizeof str3) - 1);
	sqlend += (sizeof str3) - 1;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3009

3010
	if (db_name_len) {
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heikki@hundin.mysql.fi committed
3011 3012 3013 3014
		/* Internally, old format < 4.0.18 constraints have as the
		constraint id <number>_<number>, while new format constraints
		have <databasename>/<constraintname>. */

heikki@hundin.mysql.fi's avatar
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3015
		for (i = 0; i < n_constraints_to_drop; i++) {
3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
			memcpy(sqlend, str4a1, (sizeof str4a1) - 1);
			sqlend += (sizeof str4a1) - 1;
			sqlend = ut_memcpyq(sqlend, '\'',
				old_name, db_name_len);
			sqlend = ut_strcpyq(sqlend, '\'',
				constraints_to_drop[i]);
			memcpy(sqlend, str4a2, (sizeof str4a2) - 1);
			sqlend += (sizeof str4a2) - 1;
			sqlend = ut_memcpyq(sqlend, '\'',
				old_name, db_name_len);
                        sqlend = ut_strcpyq(sqlend, '\'',
				constraints_to_drop[i]);
			memcpy(sqlend, str4a3, (sizeof str4a3) - 1);
			sqlend += (sizeof str4a3) - 1;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3030

3031
			if (!strchr(constraints_to_drop[i], '/')) {
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3032 3033 3034 3035 3036
				/* If this happens to be an old format
				constraint, let us delete it. Since all new
				format constraints contain '/', it does no
				harm to run these DELETEs anyway. */

3037 3038 3039 3040 3041 3042 3043 3044 3045 3046
				memcpy(sqlend, str4a1, (sizeof str4a1) - 1);
				sqlend += (sizeof str4a1) - 1;
				sqlend = ut_strcpyq(sqlend, '\'',
					constraints_to_drop[i]);
				memcpy(sqlend, str4a2, (sizeof str4a2) - 1);
				sqlend += (sizeof str4a2) - 1;
                        	sqlend = ut_strcpyq(sqlend, '\'',
					constraints_to_drop[i]);
				memcpy(sqlend, str4a3, (sizeof str4a3) - 1);
				sqlend += (sizeof str4a3) - 1;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3047
			}
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3048
		}
3049 3050 3051 3052 3053
	}
	else {
		memcpy(sqlend, str4b, (sizeof str4b) - 1);
		sqlend += (sizeof str4b) - 1;
	}
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3054

3055 3056
	memcpy(sqlend, str5, sizeof str5);
	sqlend += sizeof str5;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3057

3058
	ut_a(sqlend == sql + len + 1);
3059
	
3060
	graph = pars_sql(sql);
3061 3062

	ut_a(graph);
3063
	mem_free(sql);
3064 3065 3066 3067 3068 3069

	graph->trx = trx;
	trx->graph = NULL;

	graph->fork_type = QUE_FORK_MYSQL_INTERFACE;

3070
	ut_a(thr = que_fork_start_command(graph));
3071 3072 3073 3074 3075 3076

	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
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heikki@donna.mysql.fi committed
3077 3078
		if (err == DB_DUPLICATE_KEY) {
	    		ut_print_timestamp(stderr);
3079 3080 3081 3082 3083
			fputs(
     "  InnoDB: Error; possible reasons:\n"
     "InnoDB: 1) Table rename would cause two FOREIGN KEY constraints\n"
     "InnoDB: to have the same internal name in case-insensitive comparison.\n"
     "InnoDB: 2) table ", stderr);
3084
                ut_print_name(stderr, trx, new_name);
3085 3086
                fputs(" exists in the InnoDB internal data\n"
     "InnoDB: dictionary though MySQL is trying rename table ", stderr);
3087
                ut_print_name(stderr, trx, old_name);
3088
		fputs(" to it.\n"
3089
     "InnoDB: Have you deleted the .frm file and not used DROP TABLE?\n"
3090 3091 3092
     "InnoDB: You can look for further help from\n"
     "InnoDB: http://dev.mysql.com/doc/mysql/en/"
     "InnoDB_troubleshooting_datadict.html\n"
3093
     "InnoDB: If table ", stderr);
3094
			ut_print_name(stderr, trx, new_name);
3095 3096
			fputs(
		" is a temporary table #sql..., then it can be that\n"
heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
3097
     "InnoDB: there are still queries running on the table, and it will be\n"
3098
     "InnoDB: dropped automatically when the queries end.\n"
heikki@donna.mysql.fi's avatar
heikki@donna.mysql.fi committed
3099 3100
     "InnoDB: You can drop the orphaned table inside InnoDB by\n"
     "InnoDB: creating an InnoDB table with the same name in another\n"
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     "InnoDB: database and copying the .frm file to the current database.\n"
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     "InnoDB: Then MySQL thinks the table exists, and DROP TABLE will\n"
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     "InnoDB: succeed.\n", stderr);
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		}
		trx->error_state = DB_SUCCESS;
		trx_general_rollback_for_mysql(trx, FALSE, NULL);
		trx->error_state = DB_SUCCESS;
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	} else {
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		/* The following call will also rename the .ibd data file if
		the table is stored in a single-table tablespace */

		success = dict_table_rename_in_cache(table, new_name,
				!row_is_mysql_tmp_table_name(new_name));
		if (!success) {
			trx->error_state = DB_SUCCESS;
			trx_general_rollback_for_mysql(trx, FALSE, NULL);
			trx->error_state = DB_SUCCESS;
			ut_print_timestamp(stderr);
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			fputs(" InnoDB: Error in table rename, cannot rename ",
				stderr);
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			ut_print_name(stderr, trx, old_name);
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			fputs(" to ", stderr);
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			ut_print_name(stderr, trx, new_name);
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			putc('\n', stderr);
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			err = DB_ERROR;

			goto funct_exit;
		}
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		if (row_is_mysql_tmp_table_name(old_name)) {

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			/* MySQL is doing an ALTER TABLE command and it
			renames the created temporary table to the name
			of the original table. In the ALTER TABLE we maybe
			created some FOREIGN KEY constraints for the temporary
			table. But we want to load also the foreign key
			constraint definitions for the original table name. */

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			err = dict_load_foreigns(new_name);

			if (err != DB_SUCCESS) {
	    			ut_print_timestamp(stderr);
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				fputs("  InnoDB: Error: in ALTER TABLE ",
					stderr);
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				ut_print_name(stderr, trx, new_name);
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				fputs("\n"
	"InnoDB: has or is referenced in foreign key constraints\n"
	"InnoDB: which are not compatible with the new table definition.\n",
					stderr);

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				ut_a(dict_table_rename_in_cache(table,
3152
					old_name, FALSE));
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				trx->error_state = DB_SUCCESS;
				trx_general_rollback_for_mysql(trx, FALSE,
									NULL);
				trx->error_state = DB_SUCCESS;
			}
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		} else {
			err = dict_load_foreigns(new_name);

			if (err != DB_SUCCESS) {

	    			ut_print_timestamp(stderr);

				fputs(
				"  InnoDB: Error: in RENAME TABLE table ",
					stderr);
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				ut_print_name(stderr, trx, new_name);
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				fputs("\n"
     "InnoDB: is referenced in foreign key constraints\n"
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     "InnoDB: which are not compatible with the new table definition.\n",
3172
					stderr);
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				ut_a(dict_table_rename_in_cache(table,
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					old_name, FALSE));
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				trx->error_state = DB_SUCCESS;
				trx_general_rollback_for_mysql(trx, FALSE,
									NULL);
				trx->error_state = DB_SUCCESS;
			}
		}
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	}
funct_exit:	
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	if (!recovering_temp_table) {
		row_mysql_unlock_data_dictionary(trx);
	}
3188

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	if (graph) {
		que_graph_free(graph);
	}

	if (heap) {
		mem_heap_free(heap);
	}
3196
	
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  	trx_commit_for_mysql(trx);

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	trx->op_info = "";
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	return((int) err);
}
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/*************************************************************************
Checks that the index contains entries in an ascending order, unique
constraint is not broken, and calculates the number of index entries
in the read view of the current transaction. */
static
ibool
row_scan_and_check_index(
/*=====================*/
					/* out: TRUE if ok */
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct in MySQL */
	dict_index_t*	index,		/* in: index */
	ulint*		n_rows)		/* out: number of entries seen in the
					current consistent read */
{
	mem_heap_t*	heap;
	dtuple_t*	prev_entry = NULL;
	ulint		matched_fields;
	ulint		matched_bytes;
	byte*		buf;
	ulint		ret;
	rec_t*		rec;
	ibool		is_ok	= TRUE;
	int		cmp;
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	ibool		contains_null;
	ulint		i;
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	ulint*		offsets	= NULL;

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	*n_rows = 0;
	
	buf = mem_alloc(UNIV_PAGE_SIZE);
	heap = mem_heap_create(100);
	
	/* Make a dummy template in prebuilt, which we will use
	in scanning the index entries */

	prebuilt->index = index;
	prebuilt->sql_stat_start = TRUE;
	prebuilt->template_type = ROW_MYSQL_DUMMY_TEMPLATE;
	prebuilt->n_template = 0;
	prebuilt->need_to_access_clustered = FALSE;

 	dtuple_set_n_fields(prebuilt->search_tuple, 0);

	prebuilt->select_lock_type = LOCK_NONE;

	ret = row_search_for_mysql(buf, PAGE_CUR_G, prebuilt, 0, 0);
loop:
	if (ret != DB_SUCCESS) {

		mem_free(buf);
		mem_heap_free(heap);

		return(is_ok);
	}

	*n_rows = *n_rows + 1;
	
	/* row_search... returns the index record in buf, record origin offset
	within buf stored in the first 4 bytes, because we have built a dummy
	template */
	
	rec = buf + mach_read_from_4(buf);
3266

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	if (prev_entry != NULL) {
		matched_fields = 0;
		matched_bytes = 0;
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		offsets = rec_reget_offsets(rec, index,
					offsets, ULINT_UNDEFINED, heap);
		cmp = cmp_dtuple_rec_with_match(prev_entry, rec, offsets,
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						&matched_fields,
						&matched_bytes);
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		contains_null = FALSE;

		/* In a unique secondary index we allow equal key values if
		they contain SQL NULLs */

	        for (i = 0;
                     i < dict_index_get_n_ordering_defined_by_user(index);
		     i++) {
	                if (UNIV_SQL_NULL == dfield_get_len(
                                      dtuple_get_nth_field(prev_entry, i))) {

                        	contains_null = TRUE;
	                }
	        }

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		if (cmp > 0) {
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			fputs("InnoDB: index records in a wrong order in ",
				stderr);
		not_ok:
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			dict_index_name_print(stderr,
					prebuilt->trx, index);
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			fputs("\n"
				"InnoDB: prev record ", stderr);
			dtuple_print(stderr, prev_entry);
			fputs("\n"
				"InnoDB: record ", stderr);
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			rec_print(stderr, rec, offsets);
3303
			putc('\n', stderr);
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			is_ok = FALSE;
		} else if ((index->type & DICT_UNIQUE)
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			   && !contains_null
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			   && matched_fields >=
			   dict_index_get_n_ordering_defined_by_user(index)) {
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			fputs("InnoDB: duplicate key in ", stderr);
			goto not_ok;
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		}
	}

	mem_heap_empty(heap);
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	offsets = NULL;
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	prev_entry = row_rec_to_index_entry(ROW_COPY_DATA, index, rec, heap);

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	ret = row_search_for_mysql(buf, PAGE_CUR_G, prebuilt, 0, ROW_SEL_NEXT);
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	goto loop;	
}

/*************************************************************************
Checks a table for corruption. */

ulint
row_check_table_for_mysql(
/*======================*/
					/* out: DB_ERROR or DB_SUCCESS */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
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	dict_table_t*	table		= prebuilt->table;
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	dict_index_t*	index;
	ulint		n_rows;
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	ulint		n_rows_in_table	= ULINT_UNDEFINED;
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	ulint		ret 		= DB_SUCCESS;
	ulint		old_isolation_level;
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	prebuilt->trx->op_info = "checking table";
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	old_isolation_level = prebuilt->trx->isolation_level;

	/* We must run the index record counts at an isolation level
	>= READ COMMITTED, because a dirty read can see a wrong number
	of records in some index; to play safe, we use always
	REPEATABLE READ here */

	prebuilt->trx->isolation_level = TRX_ISO_REPEATABLE_READ;
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	/* Enlarge the fatal lock wait timeout during CHECK TABLE. */
	mutex_enter(&kernel_mutex);
	srv_fatal_semaphore_wait_threshold += 7200; /* 2 hours */
	mutex_exit(&kernel_mutex);

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	index = dict_table_get_first_index(table);

	while (index != NULL) {
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		/* fputs("Validating index ", stderr);
		ut_print_name(stderr, index->name);
		putc('\n', stderr); */
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		if (!btr_validate_tree(index->tree)) {
			ret = DB_ERROR;
		} else {
			if (!row_scan_and_check_index(prebuilt,
							index, &n_rows)) {
				ret = DB_ERROR;
			}

			/* fprintf(stderr, "%lu entries in index %s\n", n_rows,
			  index->name); */

			if (index == dict_table_get_first_index(table)) {
				n_rows_in_table = n_rows;
			} else if (n_rows != n_rows_in_table) {

				ret = DB_ERROR;
 
3382
				fputs("Error: ", stderr);
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				dict_index_name_print(stderr,
					prebuilt->trx, index);
3385
				fprintf(stderr,
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				" contains %lu entries, should be %lu\n",
					(ulong) n_rows,
3388
					(ulong) n_rows_in_table);
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			}
		}

		index = dict_table_get_next_index(index);
	}

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	/* Restore the original isolation level */
	prebuilt->trx->isolation_level = old_isolation_level;
	
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	/* We validate also the whole adaptive hash index for all tables
	at every CHECK TABLE */

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	if (!btr_search_validate()) {
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		ret = DB_ERROR;
	}

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	/* Restore the fatal lock wait timeout after CHECK TABLE. */
	mutex_enter(&kernel_mutex);
	srv_fatal_semaphore_wait_threshold -= 7200; /* 2 hours */
	mutex_exit(&kernel_mutex);

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	prebuilt->trx->op_info = "";
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	return(ret);
}