Port r87 from branches/5.0:

Work around Bug #12071: Do not call os_file_create_tmpfile() at runtime.
Instead, create all tempfiles at startup and guard access to them with
mutexes.

handler/ha_innodb.cc

@@ -5768,6 +5768,7 @@ 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
@@ -5787,17 +5788,18 @@ 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) {
@@ -5816,13 +5818,12 @@ 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*)"";
 
@@ -5841,6 +5842,7 @@ 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);
 
@@ -5850,9 +5852,6 @@ 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,
@@ -5861,12 +5860,15 @@ 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) {
@@ -5879,17 +5881,12 @@ 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);
 }

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

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 */
 

row/row0ins.c

@@ -588,20 +588,15 @@ row_ins_set_detailed(
 	trx_t*		trx,		/* in: transaction */
 	dict_foreign_t*	foreign)	/* in: foreign key constraint */
 {
+	mutex_enter(&srv_misc_tmpfile_mutex);
+	rewind(srv_misc_tmpfile);
 
-	FILE*	tf = os_file_create_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);
 
-	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);
-	} else {
-		trx_set_detailed_error(trx, "temp file creation failed");
-	}
+	mutex_exit(&srv_misc_tmpfile_mutex);
 }
 
 /*************************************************************************

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;

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 */