[ENBD] 2.5.46 update

[Tad Kollar]

Peter T. Breuer wrote:
> I think that and the double spinlock take were the two bugs.
> 
> Here's a diff against the 2.5.44 codebase for 2.5.47. It works for me
> (i.e., it survived light testing).

It seems to be working great so far, in fact better than it ever has before. 
For the first time I was able to complete a mkfs.xfs on an nbd without needing 
to specify a different logdev. Now, to test the md stuff to see if that's 
improved lately.

Thanks for your help, it is certainly appreciated...

Tad