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

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Message-ID: <20120613013549.GO22848@dastard>
Date:	Wed, 13 Jun 2012 11:35:49 +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 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

Cheers,

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