linux-ext4 - Re: [XFS Tests Punch Hole 2/3 v3] XFS TESTS: Add Fallocate Punch Hole Test Routines

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Message-ID: <20110519014149.GA11278@noexit.corp.google.com>
Date:	Wed, 18 May 2011 18:41:51 -0700
From:	Joel Becker <jlbec@...lplan.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Allison Henderson <achender@...ux.vnet.ibm.com>,
	xfs-oss <xfs@....sgi.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Eric Sandeen <sandeen@...hat.com>
Subject: Re: [XFS Tests Punch Hole 2/3 v3] XFS TESTS: Add Fallocate Punch
 Hole Test Routines

On Thu, May 19, 2011 at 11:31:44AM +1000, Dave Chinner wrote:
> > +#
> > +# This test is successful when the following conditions are met:
> > +#  - ls shows that the number of blocks occupied by the file
> > +#    has decreased by the number of blocks punched out.
> 
> There's no guarantee that a filesystem will punch the number of
> blocks you expect.

	Cluster allocated filesystems like ocfs2 are certainly going to
punch some multiple of clusters, not exact blocks.  Eg if the hole is
punched in the middle of a cluster.

Joel

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