[3963] in arla-drinkers
Re: nnpfs/xfs_message.h documentation
daemon@ATHENA.MIT.EDU (Tomas Olsson)
Wed Jun 21 03:50:13 2006
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From: Tomas Olsson <tol@stacken.kth.se>
To: Kristaps Johnson <kristaps@gradient-enterprises.com>
Subject: Re: nnpfs/xfs_message.h documentation
References: <Pine.LNX.4.64.0606201605200.5425@cycle0.hinterlands.net>
Date: 21 Jun 2006 09:50:06 +0200
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Kristaps Johnson <kristaps@gradient-enterprises.com> writes:
> Hello everybody. Does anybody know of API documentation for the
> nnpfs_message/attr.h (xfs_*.h on some unices) files?
>
Not really. In arla/doc/nnpfs.txt there's are slightly outdated
descriptions of the messages. There's also a dot file describing the
various states that nodes can be in in Arla:
http://cvsweb.stacken.kth.se/cvsweb.cgi/arla-doc/arla-programming/fcache-states.dot?rev=1.4;content-type=text%2Fplain
And 'The life of a file' in arla.info for an overview.
Often there are details in these docs that aren't valid any more, and some
omissions. Please let me know what you find, nagging actually does help :)
> I'm implementing the xfs char-device with a non-arla superstructure.
>
Nice. As always, I'm very curious about such things. How much can you
tell us?
> Thusfar the arlad code itself has provided a clean resource but I'd like
> to be certain about some structures and valid values.
>
Well, you should trust the code more than docs... Since nnpfs is meant to
be generic everything should be in the common nnpfs includes. Any
omissions should be corrected.
> does struct nnpfs_handle always correspond with cell, volume, vnode and
> unique?
>
In arlad, yes. In nnpfs it can be anything your daemon wants it to be.
It's just a 128 bit node id. In Keso (filesystem on top of a distributed
hash table) they used the file's hash (sort of).
I'm sure there are more things that need clarification; just ask.
/t (wants a lib that isolates daemon writers from nnpfs details)
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