From: David Howells <dhowells@redhat.com>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] AFS: Implement file locking
Date: Tue, 29 May 2007 13:43:29 +0100 [thread overview]
Message-ID: <11388.1180442609@redhat.com> (raw)
In-Reply-To: <20070527161252.GA12804@fieldses.org>
J. Bruce Fields <bfields@fieldses.org> 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
prev parent reply other threads:[~2007-05-29 12:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-24 16:55 [PATCH] AFS: Implement file locking David Howells
2007-05-25 7:31 ` Jiri Slaby
2007-05-26 2:23 ` J. Bruce Fields
2007-05-26 3:11 ` Kyle Moffett
2007-05-27 0:12 ` David Howells
2007-05-26 23:55 ` David Howells
2007-05-27 2:25 ` J. Bruce Fields
2007-05-27 8:51 ` David Howells
2007-05-27 16:12 ` J. Bruce Fields
2007-05-29 9:34 ` David Howells
2007-05-29 20:08 ` J. Bruce Fields
2007-05-29 12:43 ` David Howells [this message]
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