Comment 0 for bug 1847822

Attempting to provide access to a user within Ceph to a specific mount path fails with unknown cap type. This appears to be due to the monitor not knowing how to validate the caps that are provided with the mount path per upstream bug https://tracker.ceph.com/issues/39395 and subsequent pull requests.

This is fixed in Mimic (13.1.0+) and included in the current Luminous devel release (upcoming 12.2.13).

Steps to recreate:

1. Install ceph w/ ceph-fs.

2. Mount ceph filesystem and create subdirectory for restricting access
$ ceph-fuse -k /etc/ceph/ceph.client.foo.keyring --id foo -m 10.5.0.5:6789 /mnt/ceph-fs
$ mkdir /mnt/ceph-fs/bar

3. Authorize access for ceph user to rw a directory
$ ceph fs authorize ceph-fs client.foo /bar rw

Expected Results:

The authorize command to succeed

Actual Results:

Error EINVAL: unknown cap type '/bar'

Upstream pull-request:
https://github.com/ceph/ceph/pull/28666