[dm-devel] device mapper API help

[christophe varoqui]

> Is there any device-mapper or libdevmapper documentation?  If so, please 
> point me to some, it might answer my question.
> 
dmsetup.c is the doc you need to read :)

> Looking over the control node kernel IOCTL code, it seems that given a 
> block device major/minor, there is no direct way to find out the 
> device-mapper name or uuid, unless I've missed something.
> 
> Does it make sense to have this?  Would it make sense for the dm block 
> devices to support such an IOCTL, so a simple ioctl() on a block device 
> would reveal it's device-mapper id?
> 
> I've seen some ways to do this, and it's a huge ammount of (userspace) 
> code for what is probably a 3 line ioctl.  Would a patch be welcome?
> 
You'd be best served if the device-mapper pseudo-filesystem gets buried
out someday.

regards,
cvaroqui