3 simple steps to resolve linux read-only file system to read-write - ubuntu

My internal partition which has read write permission earlier,
turned back to readonly mode.

issue

when I tried to change it into full permission by
root@boss[bin]# sudo chmod 777 -R /media/bdtools
, I got chmod changing permissions of read-only file system

Then i tried to re-mount the partition, as many people were discussed over web.
root@boss[bin]# mount -o remount,rw /dev/sda9 /media/bdalab/bdtools
, I got filesystem drive is now write-protected

Solution
I have gone through the dmesg log, have seen error like
ext4_put_super:792: Couldn't clean up the journal

I followd below approach to overcome the readonly filesystem issue.

1) un mount the partition
2) fsck /dev/sda9
3) remount the partition

Note : before running fsck, advised to get an idea

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