I have android phone running oreo 8.1.0. I have two partitions in sdcard. One partition is ext4 formatted. I mount it using :

mount -t ext4 -o rw /dev/block/mmcblk1p2 /data/sdext2

but after sometime, the partition gets unmounted automatically and I have to mount it again. So, What is the best way to mount ext4 partition in android persistently ?