Bug#20972309 ASSERT FAILURE WHILE INITIALIZING THE DATABASE

WITH INNODB_PAGE_SIZE=64K

Analysis:
We require block1 or block2 in doublewrite buffer should be in the same
data file, but in the test, block2 crosses two data files.

Solution:
Enforce minimum size of first data file to be TRX_SYS_DOUBLEWRITE_BLOCK_SIZE * 3,
so that the doublewrite buffer blocks are in the first data file.

Reviewed-by: Jimmy Yang <[email protected]>
RB: 8916

Author: Shaohua Wang

storage/innobase/fsp/fsp0sysspace.cc

@@ -32,6 +32,7 @@ Refactored 2013-7-26 by Kevin Lewis
 #include "os0file.h"
 #include "row0mysql.h"
 #include "srv0start.h"
+#include "trx0sys.h"
 #include "ut0new.h"
 
 /** The server header file is included to access opt_initialize global variable.
@@ -821,6 +822,17 @@ SysTablespace::check_file_spec(
 		}
 	}
 
+	/* We assume doublewirte blocks in the first data file. */
+	if (err == DB_SUCCESS && *create_new_db
+	    && begin->m_size < TRX_SYS_DOUBLEWRITE_BLOCK_SIZE * 3) {
+		ib::error() << "The " << name() << " data file "
+			<< "'" << begin->name() << "' must be at least "
+			<< TRX_SYS_DOUBLEWRITE_BLOCK_SIZE * 3 * UNIV_PAGE_SIZE
+			/ (1024 * 1024) << " MB";
+
+		err = DB_ERROR;
+	}
+
 	return(err);
 }