This change enhances the growvols script to support all volumes being
backed by one thin provisioning pool.
If a pool is detected, the following occurs:
- validation to confirm every volume is backed by the pool
- only the pool is extended into the new partition
- volumes are extended by the same amount as the non thin-provisioned
case
This results in no volumes being over-provisioned, so
out-of-space behaviour will be the same as the non thin-provisioned
case.
This change also switches to using /dev/mapper device mapper paths for
volume block devices, since that is the only path the thin pool is
mapped to.
Change-Id: I96085fc889e72c942cfef7e3acb6f6cd73f606dd
f61548d863