Bugzilla 513386 - Removing large file kills JFS

[JD]

On 06/24/2010 06:51 PM, moodyjunk at frontiernet.net was caught red-handed 
while writing::
> This problem seems to have been written against FC11.  How can I tell if it exists in FC12?
>
> I've moved to FC12 and all my data filesystems are JFS.  Mount fails with "unknown filesystem type 'jfs'" even if a new filesystem is created with jfs_mkfs on this system and jfs_fsck reports it as clean.  So, I can create the jfs filesystem, and validate it is good, I just can't mount and use it.
>    
id you lsmod | grep jfs   does it show
the jfs kernel modules loaded?

On my version of vanilla kernel, the module is
located here:

/lib/modules/2.6.34-git16.fc13.i686/kernel/fs/jfs/jfs.ko

If it does exist in your os directory, then
you might try to modprobe jfs
if not, you need to build the module from source.