Need information about journal abortion and its relation with remounting

Hi Guys,

I was looking at the code of ext3 file system and found some strange 
implementation there :

Can someone please let me know the validity of below statements :

1. I found that it might also happen that journal is aborted but not 
re-mounted
2. Journal gets aborted but it might be possible to mount it in 
read-write mode.
3. Can we write some data on the partition where journal is aborted.

Thanks in advance

Regards
Shubham