[OpenAFS-devel] Re: [OpenAFS] 2020 AFS Technologies Workshop Cancelled.. kafs update

[Jeffrey Altman]

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On 4/6/2020 8:59 AM, David Howells wrote:
> Giovanni Bracco <giovanni.bracco@enea.it> wrote:
>> My feeling is that to  put it really in production the main missing po=
ints
>> are:
>>
>> 1) pam module
>=20
> Yep.  But the systemd folks are doing their best to make this tricky, I=

> believe...

When "systemd --user" services its not safe to use session keyrings.
Network credentials must be stored in user keyrings so that the user
services have access to the credentials.

>> 2) user commands, essentially "fs" first of all and also "pts"
>=20
> And there's another issue with implementing the fs tools - and that's t=
hat I'm
> not allowed to implement pioctl(2) or afs(2), so I have to find other w=
ays of
> doing things:
>=20
> 	https://www.infradead.org/~dhowells/kafs/user_interface.html
>=20
> But the main issue is that, for the most part, I'm the only one working=
 on
> them - and that's in addition to my normal job.

The "fs" command suite does not talk to the fileserver directly.  For
kafs the "fs" command should be implemented as a front-end to the
interfaces that are described by the above URL.  OpenAFS should consider
implementing those interfaces as well; at least on Linux.

The vos and pts commands from OpenAFS currently have a dependency on the
existence of a cache manager.  If that dependency was removed there
would be no need for kafs to provide its own implementation of these
tools that are somewhat specific to the administration of OpenAFS cells.

Which functionality from "pts" do your users require?

>> 3) inotify
>=20
> Implementing inotify/dnotify/fanotify is hard because I can't tell from=
 a
> callback what changed - only that something has.  By examining the data=

> version I can tell whether the contents of the object changed or whethe=
r it
> was an attribute/ACL change, but then I have to compare the attributes =
or, if
> a directory, the contents, to see which event to generate.

One of the benefits of the Extended Callback protocol is to provide this
level of detail

  https://tools.ietf.org/html/draft-benjamin-extendedcallbackinfo-02

>> The bos, vos and backup command can be run on server nodes, which can =
be
>> standard OpenAFS systems, am I right?
>=20
> The OpenAFS bos, vos and backup commands can be run from the client too=
, I
> think, since they don't require any interaction with the afs kernel mod=
ule.

The OpenAFS version of these tools requires an OpenAFS cache manager.
The AuriStorFS version does not.




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