linux-ext4 - Re: [PATCH] util-linux/fallocate: introduce an option -c to support FALLOC_FL_COLLAPSE

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Message-ID: <20140225193101.GW13647@dastard>
Date:	Wed, 26 Feb 2014 06:31:01 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Dongsu Park <dongsu.park@...fitbricks.com>
Cc:	Namjae Jeon <linkinjeon@...il.com>, linux-fsdevel@...r.kernel.org,
	xfs@....sgi.com, linux-ext4@...r.kernel.org, tytso@....edu,
	Lukas Czerner <lczerner@...hat.com>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ashish Sangwan <a.sangwan@...sung.com>
Subject: Re: [PATCH] util-linux/fallocate: introduce an option -c to support
 FALLOC_FL_COLLAPSE_RANGE

On Tue, Feb 25, 2014 at 08:08:25PM +0100, Dongsu Park wrote:
> Introduce a new option -c (or --collapse-range) to support a new flag
> FALLOC_FL_COLLAPSE_RANGE for fallocate(2). It will nullify a particular
> range [offset, offset+len] by shifting extents beyond the range to the
> beginning of the hole.
> 
> To test that, it's necessary to apply kernel patches in the patchset
> "fs: Introduce new flag (FALLOC_FL_COLLAPSE_RANGE) for fallocate" [1],
> as well as "[PATCH v6] ext4: Add support FALLOC_FL_COLLAPSE_RANGE for
> fallocate". [2]
> 
> As discussed in the thread "[PATCH RESEND 3/10] ext4: Add support
> FALLOC_FL_COLLAPSE_RANGE for fallocate", [3] this patch to util-linux
> will be useful for testing collapse-range inside xfstests.

FYI, we've already got support in xfs_io for collapse-range tests
inside xfstests.

http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/cmds/xfsprogs.git;a=commit;h=ca692f162d36c871c9c1b6169136b2c70503f2d8

There are already several tests that use it.

Cheers,

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