findmnt: determine mount by pointing to a subdirectory

[Marcin Szewczyk <Marcin.Szewczyk@xxxxxxxxx>]

Hi again,

one last issue I have with findmnt is that it seems that it won't show
any output if I point to a subdirectory of a mountpoint. For example
when the whole system is mounted from a single partition and I would
like findmnt to show me some information about / by pointing to
/boot/extlinux.

The idea is based on the df command capability to do such a thing. But
df gives less options in general. I would like to patch one of Debian's
scripts in the extlinux package. Now it uses df to determine drive where
the /boot/extlinux directory resides. It causes problems if / is AUFS.
Findmnt will show the correct block device but I have to loop cutting
off path segments one by one and check if I can find a mount.

Have I missed something? Or is there a possibility of having this kind
of functionality in the future?

-- 
Marcin Szewczyk                       http://wodny.org
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