[klibc] [patch] skip existing md devices

[H. Peter Anvin]

Aaron Griffin wrote:
> The following patch will ignore already configured md devices in
> kinit.  The rationale is that, if an md device already exists, it was
> previously assembled by some other tool (e.g. mdadm) and should remain
> there.  Currently, kinit removes it and attempts to recreate it, which
> can cause all sorts of issues, especially in the situation that, the
> md device is further encrypted and/or is an lvm volume.

I'm not sure if the existence of a device node in /dev should be sufficient to suppress 
operation on that md device.  It would probably be better off querying the md device for 
its state (via the GET_ARRAY_INFO) ioctl and skip it if it is running (or even just 
assembled?)

[Neil: do you have any opinion on this?]

	-hpa