JBD2_CRC32_CHKSUM_SIZE  124 fs/jbd2/commit.c 		tmp->h_chksum_size 	= JBD2_CRC32_CHKSUM_SIZE;
JBD2_CRC32_CHKSUM_SIZE  626 fs/jbd2/recovery.c 						JBD2_CRC32_CHKSUM_SIZE)