linux-kernel - Re: [PATCH 0/2] Add FALLOC_FL_ZERO

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Message-ID: <20120613033052.GT22848@dastard>
Date:	Wed, 13 Jun 2012 13:30:52 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>, xfs@....sgi.com
Subject: Re: [PATCH 0/2] Add FALLOC_FL_ZERO_RANGE to fallocate

On Wed, Jun 13, 2012 at 11:35:49AM +1000, Dave Chinner wrote:
> On Tue, Jun 12, 2012 at 05:36:02PM +0200, Paolo Bonzini wrote:
> > This patch adds the FALLOC_FL_ZERO_RANGE operation mode to fallocate,
> > resembling the similar XFS ioctl.  The new mode can be used with
> > or without FALLOC_FL_KEEP_SIZE, but of course not together with
> > FALLOC_FL_PUNCH_HOLE.
> 
> !FALLOC_FL_KEEP_SIZE makes no sense for this operation. It is for
> zeroing an existing section of a file while retaining the allocated
> space, not for extending or truncating the file. It's the same
> reason that FALLOC_FL_PUNCH_HOLE must have FALLOC_FL_KEEP_SIZE set.
> 
> Also, a minor nit, but you should credit where this code has
> originated from in the commit messages, and describe the use case
> for requiring it. i.e. based on:
> 
> http://permalink.gmane.org/gmane.linux.file-systems/62449

Oh, and you'll need to provide a new xfstests test based on 242 that
uses the new fallocate interface, and to do that you'll also need to
add support for the new fallocate function in xfs_io.

Adding generic filesystem functionality is not as simple as writing a
kernel patch anymore... :/

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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