I noticed a nice bug with DMAPI. If you don't have the support in
kernel, and try to mount with dmapi, it still gets mounted. On unmount
it hangs with this:
VFS: Busy inodes after unmount. Self-destruct in 5 seconds. Have a nice
day...
And when I try to mount it again, I get this:
XFS: Filesystem loop(7,0) has duplicate UUID - can't mount
mount: wrong fs type, bad option, bad superblock on /dev/loop0, or too
many mounted file systems
Clearly mount should give errors with unsupported options. That was
quite confusing because I didn't get those kernel messages first over
ssh connection :)
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