A question on umounting without flushing journal

[Bo Branten <bosse@xxxxxxxxxx>]

Hello,

now I have another question on how to test the ext4 driver we implement 
for another os: At mount time the driver should check the journal and use 
jbd2 to replay if there is anything left in it and I would like to ask if 
there is any other methods to do an unclean umount in linux besides 
pressing reset? I would like to leave a lot of records in the journal that 
our driver can try to process?

Bo Branten