Ceph » rbd

Description of problem:
If the feature is already enabled, still it allow user to enable it again.
Similarly goes with disable

Version-Release number of selected component (if applicable):
ceph version 10.2.1-6.el7cp

How reproducible:
Always.

Steps to Reproduce:
1.rbd info cephfs_data/img1

rbd image 'img1':
size 102400 MB in 25600 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.1251ee238e1f29
format: 2
features: layering, deep-flatten
flags:

2. rbd feature disable cephfs_data/img1 exclusive-lock, object-map, fast-diff
3. rbd feature disable cephfs_data/img1 exclusive-lock, object-map, fast-diff
4. rbd feature disable cephfs_data/img1 exclusive-lock, object-map, fast-diff

Actual results:
User should not be allowed to disable the feature's which are not at all enabled.

Expected results:
There should be error saying that features are not enabled.

Additional info:
Same thing applies for enable.

We can enable multiple times the same features, even though its already enabled.