The current osd capabilities do a few things that, in retrospect, are more
complex than is necessary or desired. In particular, the current
implementation allows
allow rwx, deny pool blah rwx
The deny stuff is confusing to understand (it's ordering dependent), and
not used by anything (that we know of).
There is also an idea of 'default permissions' on pools that you own. For
example, if you have a blank capability, and create a pool 'foo' owned by
your auid, then you (by default) get rwx permissions. Unless the cap says
otherwise, like
allow pool foo rw
allow auid 123 rw
This is also sneaky and confusing. You can get equivalent functionality
with an explicit cap like
allow auid 123 rwx
The current implementation is also awkward to maintain and understand in
terms of grants.
So: there's a new implementation in wip-osdcap that removes 'deny' and the
default caps thing, has a well-defined grammar, and a simpler
implementation. See
https://github.com/ceph/ceph/commits/wip-osdcap
The danger is merging this is that someone out there has dived into the
old and documented caps code and started using the deny or default cap
functionality. This is your fair warning! If you're using deny, you
probably shouldn't, and if you're using the default caps, you need to
adjust them to explicitly allow access to pools you create.
sage
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