[OpenAFS] write permissions without locking?

Fri, 19 Feb 2010 21:58:37 +0100

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Jeffrey Altman írta:
> On 2/19/2010 1:01 PM, Gémes Géza wrote:
>   
>> Shortly, the answer is yes.
>> A longer one the clients in question are Windows XP SP3 with KB955535
>> and KB971421 applied, OpenAFS 1.5.7000
>> The applications are mainly from MSOffice2003: mostly Word and Excel.
>>     
>
> The answer is that Word and Excel explicitly request exclusive byte
> range locks on the files that are open.  Since AFS does not support
> byte range locks, these become exclusive full file locks which prevent
> file sharing across machines.   The only way to disable this behavior
> is to disable the acquisition of file locks from the file server.  There
> is a registry key that will permit this.  It restores the behavior of
> the pre-1.4 Windows clients.  However, doing so opens the door for two
> copies of Word to write to the file at the same time and corrupt the
> contents.  The registry key is documented in the release notes in
> Appendix A.
>
> The current version of OpenAFS for Windows is 1.5.7200.  This contains
> an important fix to the Rx RPC library that will improve performance
> and reliability.
>
> Jeffrey Altman
>
>   
Thank you!

I will upgrade ASAP (probably on Monday as this is performed 
automatically via wpkg).
About the disable of the lock, I will reflect about which variant is 
going to cause less pain in the long term.

Thanks

Geza

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Jeffrey Altman írta:
<blockquote cite="mid:4B7ED3EF.80606@secure-endpoints.com" type="cite">
  <pre wrap="">On 2/19/2010 1:01 PM, Gémes Géza wrote:
  </pre>
  <blockquote type="cite">
    <pre wrap="">Shortly, the answer is yes.
A longer one the clients in question are Windows XP SP3 with KB955535
and KB971421 applied, OpenAFS 1.5.7000
The applications are mainly from MSOffice2003: mostly Word and Excel.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
The answer is that Word and Excel explicitly request exclusive byte
range locks on the files that are open.  Since AFS does not support
byte range locks, these become exclusive full file locks which prevent
file sharing across machines.   The only way to disable this behavior
is to disable the acquisition of file locks from the file server.  There
is a registry key that will permit this.  It restores the behavior of
the pre-1.4 Windows clients.  However, doing so opens the door for two
copies of Word to write to the file at the same time and corrupt the
contents.  The registry key is documented in the release notes in
Appendix A.

The current version of OpenAFS for Windows is 1.5.7200.  This contains
an important fix to the Rx RPC library that will improve performance
and reliability.

Jeffrey Altman

  </pre>
</blockquote>
Thank you!<br>
<br>
I will upgrade ASAP (probably on Monday as this is performed
automatically via wpkg).<br>
About the disable of the lock, I will reflect about which variant is
going to cause less pain in the long term.<br>
<br>
Thanks<br>
<br>
Geza<br>
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