[dm-devel] DM kernel interface
Mikulas Patocka
mpatocka at redhat.com
Fri Jan 16 01:00:42 UTC 2009
On Thu, 15 Jan 2009, Allen Jack wrote:
> I have used the ioctl interface to create dm objects and get information
> about dm objects from a user space application, and am familiar with it.
> I am now required to get the object information from kernel space, and
> was wondering what interface is available to do that directly.
>
> Is there a direct device mapper interface in kernel space that I can use
> to get the object information from? For example, I need to see the
> target mappings within a linear object.
>
> Allen Jack
> Sr. Software Engineer
> ajack at novell.com
> (801) 861-5923
> Novell, Inc.
> Making IT Work As One
> www.novell.com
Hi
You can call the same ioctls from kernel space as well, see ioctl_by_bdev.
Calling device mapper functions defined in <linux/device-mapper.h>
directly is discouraged if you are not developing dm target driver.
Mikulas
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