Re: Problem with loop mount

[Joey Hess <joeyh@debian.org>]

Jon Forsberg wrote:
> # dd bs=1M seek=300 count=0 of=bigfile

That makes a file that consits of a single 300mb hole. (run du on it)

> If I create the loopfile with "dd bs=1M count=300 if=/dev/zero of=bigfile"
> instead (which is the "normal" way to do it, I guess) everything works.
> 
> So is this
> A. A known problem/limitation in the kernel (can't use loopfiles with holes(?))

I can't find any real documentation about loopback files and whether
they should support holes. However, the D state means the kernel is in
an inunteruptable sleep; presumably trying to read the hole.

-- 
see shy jo