Re: [PATCH] AFS: Implement file locking

[David Howells]

J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:

> > At the moment, yes.  Don't the POSIX and flock lock-handling routines in the
> > kernel normally do that anyway?
> 
> No, they'd upgrade in that case.

I just checked.  The OpenAFS server supports neither lock upgrading nor lock
downgrading.  Attempts to do either incur an abort with code 0x02f6df0a
(which I believe to be equivalent to EAGAIN).

This means that I can't practically support lock upgrading.  Lock downgrading
I can emulate by handing apparent readlocks to local processes whilst holding
a writelock on the server.

David
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