Convert a partition

Convert ext2 -> ext3
Suppose you want to convert your /tmp partition into ext3 then follow the following step:-
1. # init 1(Single user mode)
2. un-mount your partition which you like to convert
# umount /tmp
or
# mount -o remount,rw /tmp
3. command to convert
# tune2fs -j /dev/sda6 (Here /dev/sda6 represent /tmp partition.you must check using fdisk -l command)
This command add .journal file into /tmp partition.
4.Open /etc/fstab file change partition type of /tmp into ext3.
5.Now check file system type using following command:-
# file -s /dev/sda9
6.# init 6(Restart)

Convert from ext 3 -> ext2
Suppose you want to convert your /tmp partition into ext2 then follow the following step:-

1.# init 1(single user mode)
2. un-mount your partition which you like to convert
# umount /tmp
or
# mount -o remount,ro /tmp(better choice)
3. command to convert
# tune2fs -O^has_journal /dev/sda9 (Here /dev/sda9 represent /tmp partition)
4.# e2fsck /dev/sda9
5.# rm -f /tmp/.journal (Removing .journal file)
6.Open /etc/fstab file change partition type of /tmp into ext2.
7.Check partition type of /dev/sda9 using following command:-
# file -s /dev/sda9
8.# init 6(Restart)