[dm-devel] 2.6.11-rc3-udm2

[Alasdair G Kergon <agk redhat com>]

ftp://sources.redhat.com/pub/dm/patches/2.6-unstable/2.6.11-rc3/2.6.11-rc3-udm2.tar.bz2
 
Same as udm1 with a bit of tidying up.

Simplified the locking for now: it uses the per-device multipath lock everywhere.
We can refine this later to address the performance issues.
Updated version numbers and added a few more comments.

Please re-test and review this patchset - I'd like to submit patches 7-10 to -mm
after adding more documentation.

Alasdair