[OpenAFS-win32-devel] problem with file open for read-only

[Jeffrey Altman]

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Tomcsányi Roland wrote:
> Hello,
>  
> we tried openafs 1.5.14 (winxp with sp2), but we have a problem
> and I would like to know this is a knowned problem or just appear
> in own system...
>  
> If we open for read-write a .doc or .xls file then (from other computer) 
> we couldn't open this file for read-only!
> If first open for read-only, and second open for read-write, then it's OK...
>  
> I don't understand this...
>  
> Best regards:    Roland 

AFS does not support byte range locks but Windows requires them.
Therefore, when a file is opened for writing, the cache manager on
that machine obtains a full file write lock.  All other cache managers
are then prevented from reading the file until the file has been closed.

When Office opens a file for read-only, it obtains a lock when the
file is read and then it releases the lock.  This allows another cache
manager to obtain the lock.

Jeffrey Altman




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