Bugzilla 513386 - Removing large file kills JFS

[moodyjunk at frontiernet.net]

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.