Fix BUG#12071: "Windows hang:'Opening tables' or 'Waiting for

 table' lockup".
 Changes from the innodb-5.0-ss92 snapshot.
 Do not call os_file_create_tmpfile() at runtime. Instead, create
 all tempfiles at startup and guard access to them with mutexes.

innobase/btr/btr0sea.c

@@ -889,7 +889,8 @@ Drops a page hash index. */
 void
 btr_search_drop_page_hash_index(
 /*============================*/
-	page_t*	page)	/* in: index page, s- or x-latched */
+	page_t*	page)	/* in: index page, s- or x-latched, or an index page
+			for which we know that block->buf_fix_count == 0 */
 {
 	hash_table_t*	table;
 	buf_block_t*	block;

innobase/include/buf0buf.h

@@ -831,7 +831,13 @@ struct buf_block_struct{
 					records with the same prefix should be
 					indexed in the hash index */
 					
-	/* The following 6 fields are protected by btr_search_latch: */
+	/* These 6 fields may only be modified when we have
+	an x-latch on btr_search_latch AND
+	a) we are holding an s-latch or x-latch on block->lock or
+	b) we know that block->buf_fix_count == 0.
+
+	An exception to this is when we init or create a page
+	in the buffer pool in buf0buf.c. */
 
 	ibool		is_hashed;	/* TRUE if hash index has already been
 					built on this page; note that it does
@@ -849,11 +855,7 @@ struct buf_block_struct{
 					BTR_SEARCH_RIGHT_SIDE in hash
 					indexing */
 	dict_index_t*	index;		/* Index for which the adaptive
-					hash index has been created.
-					This field may only be modified
-					while holding an s-latch or x-latch
-					on block->lock and an x-latch on
-					btr_search_latch. */
+					hash index has been created. */
 	/* 6. Debug fields */
 #ifdef UNIV_SYNC_DEBUG
 	rw_lock_t	debug_latch;	/* in the debug version, each thread

innobase/include/os0file.h

@@ -187,7 +187,7 @@ Creates a temporary file. */
 FILE*
 os_file_create_tmpfile(void);
 /*========================*/
-			/* out: temporary file handle (never NULL) */
+			/* out: temporary file handle, or NULL on error */
 /***************************************************************************
 The os_file_opendir() function opens a directory stream corresponding to the
 directory named by the dirname argument. The directory stream is positioned

innobase/include/srv0srv.h

@@ -34,6 +34,18 @@ extern ibool	srv_lower_case_table_names;
 extern mutex_t	srv_monitor_file_mutex;
 /* Temporary file for innodb monitor output */
 extern FILE*	srv_monitor_file;
+/* Mutex for locking srv_dict_tmpfile.
+This mutex has a very high rank; threads reserving it should not
+be holding any InnoDB latches. */
+extern mutex_t	srv_dict_tmpfile_mutex;
+/* Temporary file for output from the data dictionary */
+extern FILE*	srv_dict_tmpfile;
+/* Mutex for locking srv_misc_tmpfile.
+This mutex has a very low rank; threads reserving it should not
+acquire any further latches or sleep before releasing this one. */
+extern mutex_t	srv_misc_tmpfile_mutex;
+/* Temporary file for miscellanous diagnostic output */
+extern FILE*	srv_misc_tmpfile;
 
 /* Server parameters which are read from the initfile */
 

innobase/row/row0ins.c

@@ -588,20 +588,21 @@ row_ins_set_detailed(
 	trx_t*		trx,		/* in: transaction */
 	dict_foreign_t*	foreign)	/* in: foreign key constraint */
 {
-		
-	FILE*	tf = os_file_create_tmpfile();
-
-	if (tf) {
-		ut_print_name(tf, trx, foreign->foreign_table_name);
-		dict_print_info_on_foreign_key_in_create_format(tf, trx,
-			foreign, FALSE);
-
-		trx_set_detailed_error_from_file(trx, tf);
-
-		fclose(tf);
+	mutex_enter(&srv_misc_tmpfile_mutex);
+	rewind(srv_misc_tmpfile);
+
+	if (os_file_set_eof(srv_misc_tmpfile)) {
+		ut_print_name(srv_misc_tmpfile, trx,
+				foreign->foreign_table_name);
+		dict_print_info_on_foreign_key_in_create_format(
+				srv_misc_tmpfile,
+				trx, foreign, FALSE);
+		trx_set_detailed_error_from_file(trx, srv_misc_tmpfile);
 	} else {
-		trx_set_detailed_error(trx, "temp file creation failed");
+		trx_set_detailed_error(trx, "temp file operation failed");
 	}
+
+	mutex_exit(&srv_misc_tmpfile_mutex);
 }
 
 /*************************************************************************
@@ -709,7 +710,7 @@ row_ins_foreign_report_add_err(
 	}
 
 	if (rec) {
-		rec_print(ef, rec, foreign->foreign_index);
+		rec_print(ef, rec, foreign->referenced_index);
 	}
 	putc('\n', ef);
 

innobase/srv/srv0srv.c

@@ -397,6 +397,18 @@ mutex_t	srv_innodb_monitor_mutex;
 mutex_t	srv_monitor_file_mutex;
 /* Temporary file for innodb monitor output */
 FILE*	srv_monitor_file;
+/* Mutex for locking srv_dict_tmpfile.
+This mutex has a very high rank; threads reserving it should not
+be holding any InnoDB latches. */
+mutex_t	srv_dict_tmpfile_mutex;
+/* Temporary file for output from the data dictionary */
+FILE*	srv_dict_tmpfile;
+/* Mutex for locking srv_misc_tmpfile.
+This mutex has a very low rank; threads reserving it should not
+acquire any further latches or sleep before releasing this one. */
+mutex_t	srv_misc_tmpfile_mutex;
+/* Temporary file for miscellanous diagnostic output */
+FILE*	srv_misc_tmpfile;
 
 ulint	srv_main_thread_process_no	= 0;
 ulint	srv_main_thread_id		= 0;

innobase/srv/srv0start.c

@@ -1180,6 +1180,20 @@ NetWare. */
 		}
 	}
 
+	mutex_create(&srv_dict_tmpfile_mutex);
+	mutex_set_level(&srv_dict_tmpfile_mutex, SYNC_DICT_OPERATION);
+	srv_dict_tmpfile = os_file_create_tmpfile();
+	if (!srv_dict_tmpfile) {
+		return(DB_ERROR);
+	}
+
+	mutex_create(&srv_misc_tmpfile_mutex);
+	mutex_set_level(&srv_misc_tmpfile_mutex, SYNC_ANY_LATCH);
+	srv_misc_tmpfile = os_file_create_tmpfile();
+	if (!srv_misc_tmpfile) {
+		return(DB_ERROR);
+	}
+
 	/* Restrict the maximum number of file i/o threads */
 	if (srv_n_file_io_threads > SRV_MAX_N_IO_THREADS) {
 
@@ -1822,8 +1836,19 @@ innobase_shutdown_for_mysql(void)
 			mem_free(srv_monitor_file_name);
 		}
 	}
+	if (srv_dict_tmpfile) {
+		fclose(srv_dict_tmpfile);
+		srv_dict_tmpfile = 0;
+	}
+
+	if (srv_misc_tmpfile) {
+		fclose(srv_misc_tmpfile);
+		srv_misc_tmpfile = 0;
+	}
 
 	mutex_free(&srv_monitor_file_mutex);
+	mutex_free(&srv_dict_tmpfile_mutex);
+	mutex_free(&srv_misc_tmpfile_mutex);
 
 	/* 3. Free all InnoDB's own mutexes and the os_fast_mutexes inside
 	them */

mysql-test/r/innodb.result

@@ -2846,4 +2846,33 @@ d varchar(255) character set utf8,
 e varchar(255) character set utf8,
 key (a,b,c,d,e)) engine=innodb;
 ERROR 42000: Specified key was too long; max key length is 3072 bytes
+create table t1(a int primary key) row_format=redundant engine=innodb;
+create table t2(a int primary key,constraint foreign key(a)references t1(a)) row_format=compact engine=innodb;
+create table t3(a int primary key) row_format=compact engine=innodb;
+create table t4(a int primary key,constraint foreign key(a)references t3(a)) row_format=redundant engine=innodb;
+insert into t1 values(1);
+insert into t3 values(1);
+insert into t2 values(2);
+ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test/t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
+insert into t4 values(2);
+ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test/t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
+insert into t2 values(1);
+insert into t4 values(1);
+update t1 set a=2;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test/t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
+update t2 set a=2;
+ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test/t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
+update t3 set a=2;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test/t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
+update t4 set a=2;
+ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test/t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
+truncate t1;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test/t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
+truncate t3;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test/t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
+truncate t2;
+truncate t4;
+truncate t1;
+truncate t3;
+drop table t4,t3,t2,t1;
 End of 5.0 tests

mysql-test/t/innodb.test

@@ -1833,4 +1833,38 @@ create table t1 (a varchar(255) character set utf8,
                  e varchar(255) character set utf8,
                  key (a,b,c,d,e)) engine=innodb;
 
+# test that foreign key errors are reported correctly (Bug #15550)
+
+create table t1(a int primary key) row_format=redundant engine=innodb;
+create table t2(a int primary key,constraint foreign key(a)references t1(a)) row_format=compact engine=innodb;
+create table t3(a int primary key) row_format=compact engine=innodb;
+create table t4(a int primary key,constraint foreign key(a)references t3(a)) row_format=redundant engine=innodb;
+
+insert into t1 values(1);
+insert into t3 values(1);
+-- error 1452
+insert into t2 values(2);
+-- error 1452
+insert into t4 values(2);
+insert into t2 values(1);
+insert into t4 values(1);
+-- error 1451
+update t1 set a=2;
+-- error 1452
+update t2 set a=2;
+-- error 1451
+update t3 set a=2;
+-- error 1452
+update t4 set a=2;
+-- error 1451
+truncate t1;
+-- error 1451
+truncate t3;
+truncate t2;
+truncate t4;
+truncate t1;
+truncate t3;
+
+drop table t4,t3,t2,t1;
+
 --echo End of 5.0 tests

sql/ha_innodb.cc

@@ -5742,6 +5742,7 @@ ha_innobase::update_table_comment(
 	uint	length			= (uint) strlen(comment);
 	char*				str;
 	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
+	long	flen;
 
 	/* We do not know if MySQL can call this function before calling
 	external_lock(). To be safe, update the thd of the current table
@@ -5761,17 +5762,18 @@ ha_innobase::update_table_comment(
 	trx_search_latch_release_if_reserved(prebuilt->trx);
 	str = NULL;
 
-	if (FILE* file = os_file_create_tmpfile()) {
-		long	flen;
-
 	/* output the data to a temporary file */
-		fprintf(file, "InnoDB free: %lu kB",
+
+	mutex_enter_noninline(&srv_dict_tmpfile_mutex);
+	rewind(srv_dict_tmpfile);
+
+	fprintf(srv_dict_tmpfile, "InnoDB free: %lu kB",
       		   (ulong) fsp_get_available_space_in_free_extents(
       					prebuilt->table->space));
 
-		dict_print_info_on_foreign_keys(FALSE, file,
+	dict_print_info_on_foreign_keys(FALSE, srv_dict_tmpfile,
 				prebuilt->trx, prebuilt->table);
-		flen = ftell(file);
+	flen = ftell(srv_dict_tmpfile);
 	if (flen < 0) {
 		flen = 0;
 	} else if (length + flen + 3 > 64000) {
@@ -5790,13 +5792,12 @@ ha_innobase::update_table_comment(
 			*pos++ = ';';
 			*pos++ = ' ';
 		}
-			rewind(file);
-			flen = (uint) fread(pos, 1, flen, file);
+		rewind(srv_dict_tmpfile);
+		flen = (uint) fread(pos, 1, flen, srv_dict_tmpfile);
 		pos[flen] = 0;
 	}
 
-		fclose(file);
-	}
+	mutex_exit_noninline(&srv_dict_tmpfile_mutex);
 
         prebuilt->trx->op_info = (char*)"";
 
@@ -5815,6 +5816,7 @@ ha_innobase::get_foreign_key_create_info(void)
 {
 	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
 	char*	str	= 0;
+	long	flen;
 
 	ut_a(prebuilt != NULL);
 
@@ -5824,9 +5826,6 @@ ha_innobase::get_foreign_key_create_info(void)
 
 	update_thd(current_thd);
 
-	if (FILE* file = os_file_create_tmpfile()) {
-		long	flen;
-
 	prebuilt->trx->op_info = (char*)"getting info on foreign keys";
 
 	/* In case MySQL calls this in the middle of a SELECT query,
@@ -5835,12 +5834,15 @@ ha_innobase::get_foreign_key_create_info(void)
 
 	trx_search_latch_release_if_reserved(prebuilt->trx);
 
+	mutex_enter_noninline(&srv_dict_tmpfile_mutex);
+	rewind(srv_dict_tmpfile);
+
 	/* output the data to a temporary file */
-		dict_print_info_on_foreign_keys(TRUE, file,
+	dict_print_info_on_foreign_keys(TRUE, srv_dict_tmpfile,
 				prebuilt->trx, prebuilt->table);
 	prebuilt->trx->op_info = (char*)"";
 
-		flen = ftell(file);
+	flen = ftell(srv_dict_tmpfile);
 	if (flen < 0) {
 		flen = 0;
 	} else if (flen > 64000 - 1) {
@@ -5853,17 +5855,12 @@ ha_innobase::get_foreign_key_create_info(void)
 	str = my_malloc(flen + 1, MYF(0));
 
 	if (str) {
-			rewind(file);
-			flen = (uint) fread(str, 1, flen, file);
+		rewind(srv_dict_tmpfile);
+		flen = (uint) fread(str, 1, flen, srv_dict_tmpfile);
 		str[flen] = 0;
 	}
 
-		fclose(file);
-	} else {
-		/* unable to create temporary file */
-          	str = my_strdup(
-"/* Error: cannot display foreign key constraints */", MYF(0));
-	}
+	mutex_exit_noninline(&srv_dict_tmpfile_mutex);
 
   	return(str);
 }