linux-kernel - Re: [PATCH 4/7][TAKE5] support new modes in fallocate

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Message-ID: <20070711090441.GB18301@infradead.org>
Date:	Wed, 11 Jul 2007 10:04:41 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Timothy Shimmin <tes@....com>
Cc:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, adilger@...sterfs.com,
	David Chinner <dgc@....com>, suparna@...ibm.com,
	cmm@...ibm.com, xfs@....sgi.com
Subject: Re: [PATCH 4/7][TAKE5] support new modes in fallocate

On Wed, Jul 04, 2007 at 03:37:01PM +1000, Timothy Shimmin wrote:
> We use this capability in XFS at the moment.
> I think this is mainly for DMF (HSM) but is done via the xfs handle 
> interface
> (xfs_open_by_handle) AFAICT.
> 

You're not :)  You're using an O_INVIBLE equivalent (as described below),
which would be a useful thing to have at the VFS level, but adding hacks
to some system calls only wouldn't help any HSM system.  It's just useless
API clutter.

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