volume.is_mounted wrong for luks partitions

[Kay Sievers]

On Sun, Apr 16, 2006 at 02:34:21PM -0400, David Zeuthen wrote:
> On Sun, 2006-04-16 at 14:29 -0400, David Zeuthen wrote:
> > Another thing is that we really want to get away from looking at
> > symlinks and use e.g. dm_task_get_deps to figure out that the device
> > mapper volume really stems from the LUKS encrypted physical volume.
> 
> Replying to myself, actually it seems that the latest kernels have this
> bit of info
> 
>  # tree /sys/block/dm-0
>  /sys/block/dm-0
>  |-- dev
>  |-- holders
>  |-- range
>  |-- removable
>  |-- size
>  |-- slaves
>  |   `-- sda2 -> ../../../block/sda/sda2
>  |-- stat
>  `-- uevent
> 
>  # tree /sys/block/sda/sda2/
>  /sys/block/sda/sda2/
>  |-- dev
>  |-- holders
>  |   `-- dm-0 -> ../../../../block/dm-0
>  |-- size
>  |-- start
>  |-- stat
>  `-- uevent
> 
> Now just need to figure out when this was introduced (does anyone know?)

2 weeks ago :)
  http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6a4d44c1f1108d6c9e8850e8cf166aaba0e56eae

> and whether it's sufficient to look at the slaves/ subdirectory. Then
> write a small patch to use this :-)

It should be fine, to show the dependency, yeah.

Thanks,
Kay