Gorka Eguileor 8d7f37e810 RBD: Fix stats reporting ...

Current RBD code is incorrectly reporting the stats of the pool in the
following ways:

- `provisioned_capacity_gb` contains physical space used by cinder created
  volumes.
- `free_capacity_gb` is not taking into account that pools can have quota
  restrictions and they should be used as the reference for the free capacity.
- `total_capacity` dynamically changes, which means that there is no way to
  have a fixed over provisioning capacity.

This patch fixes the stats reporting making sure we return the right
values in `provisioned_capacity_gb` and `free_capacity_gb`, and allows
us to use a static calculation of the `total_capacity` using
`report_dynamic_total_capacity` configuration option.

We don't report `allocated_capacity_gb` because this is something that
is calculated by the Cinder core code and should not be reported by
drivers, even if it's not currently working as expected [1][2].

[1] https://bugs.launchpad.net/cinder/+bug/1712549
[2] https://bugs.launchpad.net/cinder/+bug/1706057

Change-Id: I1e82bf9d0b6cc0fb1d1fc2dd8b8ccc59aea3f73f
Closes-Bug: #1706060
(cherry picked from commit 8469109016)
Conflicts:
	cinder/tests/unit/volume/drivers/test_rbd.py
	cinder/volume/drivers/rbd.py

2017-10-06 11:06:20 +02:00

768 B

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