Post-merge fix. Moved the symlink handling from sql_parse.cc here.

mysql-test/r/symlink.result:
  Post-merge fix
mysql-test/t/symlink.test:
  Post-merge fix

mysql-test/r/symlink.result

@@ -146,10 +146,10 @@ DATA DIRECTORY='TEST_DIR/master-data/test';
 ERROR HY000: Incorrect arguments to DATA DIRECORY
 CREATE TABLE t1(a INT)
 DATA DIRECTORY='TEST_DIR/master-data/';
-DROP TABLE t1;
+ERROR HY000: Incorrect arguments to DATA DIRECORY
 CREATE TABLE t1(a INT)
 INDEX DIRECTORY='TEST_DIR/master-data';
-DROP TABLE t1;
+ERROR HY000: Incorrect arguments to INDEX DIRECORY
 CREATE TABLE t1(a INT)
 INDEX DIRECTORY='TEST_DIR/master-data_var';
 ERROR HY000: Can't create/write to file 'TEST_DIR/master-data_var/t1.MYI' (Errcode: 2)

mysql-test/t/symlink.test

@@ -126,6 +126,9 @@ drop table t1;
 --write_file $MYSQLTEST_VARDIR/tmp/t1.MYI
 EOF
 --replace_result $MYSQLTEST_VARDIR TEST_DIR
+# If $MYSQLTEST_VARDIR is a symbolic link, the low level MyISAm error
+# message contains the real path of $MYSQLTEST_VARDIR. Try to catch this.
+--replace_regex /write to file '\/.*\/tmp/write to file 'TEST_DIR\/tmp/
 --error 1
 eval CREATE TABLE t1(a INT)
 DATA DIRECTORY='$MYSQLTEST_VARDIR/tmp'
@@ -209,13 +212,13 @@ INDEX DIRECTORY='$MYSQLTEST_VARDIR/master-data/mysql';
 eval CREATE TABLE t1(a INT)
 DATA DIRECTORY='$MYSQLTEST_VARDIR/master-data/test';
 --replace_result $MYSQLTEST_VARDIR TEST_DIR
+--error 1210
 eval CREATE TABLE t1(a INT)
 DATA DIRECTORY='$MYSQLTEST_VARDIR/master-data/';
-DROP TABLE t1;
 --replace_result $MYSQLTEST_VARDIR TEST_DIR
+--error 1210
 eval CREATE TABLE t1(a INT)
 INDEX DIRECTORY='$MYSQLTEST_VARDIR/master-data';
-DROP TABLE t1;
 --replace_result $MYSQLTEST_VARDIR TEST_DIR
 --error 1
 eval CREATE TABLE t1(a INT)

sql/sql_table.cc

@@ -3517,8 +3517,26 @@ bool mysql_create_table_no_lock(THD *thd,
   create_info->table_existed= 0;		// Mark that table is created
 
 #ifdef HAVE_READLINK
+  if (test_if_data_home_dir(create_info->data_file_name))
+  {
+    my_error(ER_WRONG_ARGUMENTS, MYF(0), "DATA DIRECTORY");
+    goto unlock_and_end;
+  }
+  if (test_if_data_home_dir(create_info->index_file_name))
+  {
+    my_error(ER_WRONG_ARGUMENTS, MYF(0), "INDEX DIRECTORY");
+    goto unlock_and_end;
+  }
+
+#ifdef WITH_PARTITION_STORAGE_ENGINE
+  if (check_partition_dirs(thd->lex->part_info))
+  {
+    goto unlock_and_end;
+  }
+#endif /* WITH_PARTITION_STORAGE_ENGINE */
+
   if (!my_use_symdir || (thd->variables.sql_mode & MODE_NO_DIR_IN_CREATE))
-#endif
+#endif /* HAVE_READLINK */
   {
     if (create_info->data_file_name)
       push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,