[OpenAFS] File locking
Jeffrey Altman
jaltman@secure-endpoints.com
Fri, 15 Jul 2005 11:13:25 -0400
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I believe Matt is working on implementing something like this for the
Unix/Linux AFS clients. However, no one at the present time is working
on an implementation for the Windows clients which is what you require.
Normally I would be the one to do it but I will not have time to do so
for several months. There are other higher priority efforts that I
must work on:
* helping get the OpenAFS 1.4 release out the door so there is a
truly "stable" Windows release that will not suffer from unfortunate
regressions due to new development
* working on the rxgk security provider so there is the ability to
use something other than single DES for authentication and
data confidentiality
* porting to 64-bit windows
* adding support for the Unicode version of the CIFS/SMB protocol
so that we can have large file support, dfs interoperability,
Unicode path name support, etc.
Byte range locking is important but it is considered to be of slightly
lower priority. In any event, even if I found a few days to implement
it. It would not be in the initial 1.4 release. It would be nice to
get it implemented before the end of the year.
Jeffrey Altman
Daniel Wood wrote:
> Hi all,
>
> I am looking into implementing OpenAFS over a network comprised mainly
> of Windows clients. Having installed v1.3.84 on a Linux server, the
> system is working fine so far. The ability to manipulate volumes (such
> as moving between servers) to such an extent is particularly useful!
>
> I was wondering what the progress was as regards byte-range locking.
> Having searched a lot on the subject of file locking (and having had to
> learn a few things!), I have determined that OpenAFS utilises advisory
> whole-file locking but not byte-range locking. Thus Windows
> applications such as Microsoft Office which utilise byte-range locking
> are very dangerous on an AFS network due to the fact that two
> applications can read/write to a file. As an aside, why do Office apps
> use byte-range locking when they effectively lock the whole file?
>
> Having looked at archived mailing list messages referring to Stage 1/2
> locking in AFS, I was curious as to the status of any work so far?
> Ideally (and assuming I'm vaguely right!) a mechanism whereby a file is
> locked on the server to prevent writes (and either reads as well or
> notifying the user the file is read-only as per Office) whilst enabling
> byte-range locks in the cache would suit our purposes, since we use
> shared drives where multiple users will access documents but must not be
> allowed to change them at the same time. This I believe is referred to
> as Stage 1?
>
> I get the impression that work on this would be at a tangent to the way
> AFS works, however that Stage 1 is feasible?
>
> Any corrections to my technical knowledge are most welcome, and any
> thoughts on a timescale in which this might be done if it can be done
> would be nice (though I do realise that's a hard thing to answer!).
>
> Without implementation of this feature I don't think we will be able to
> use OpenAFS which is a shame because it does it's job well! I don't
> think we can risk the possible loss of information it could cause, even
> if it is a somewhat unlikely prospect.
>
> Thanks for your time,
>
> Dan
>
>
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