[lxc-devel] [RFC PATCH 00/11] Add support for devtmpfs in user namespaces

[Christian Seiler]

Hi,

(removed every CC but yourself and lxc-devel, don't need to spam LKML
for this)

> Woa!  Time out...  Sorry, this will be an off topic aside.
> 
> Loop devices support partitions?  I'd love to know how that works.

Use util-linux >= 2.21 with Kernel >= 3.1:

losetup -P -f filename
Creates: /dev/loopXpY
Remove with: losetup -d /dev/loopX
  (Also removes partition devices automatically.)

Also, using device mapper is an option (supported by all Linux
distributions that aren't completely ancient):

losetup -f filename
kpartx -a /dev/loopXpY
Creates: /dev/mapper/loopXpY
Remove with: kpartx -d /dev/loopX && losetup -d /dev/loopX
  (Note that not doing kpartx -d /dev/loopX is problematic.)

Regards,
Christian