linux-kernel - Re: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE

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Date:	Tue, 18 Feb 2014 20:46:44 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Lukáš Czerner <lczerner@...hat.com>
Cc:	Namjae Jeon <linkinjeon@...il.com>, viro@...iv.linux.org.uk,
	bpm@....com, tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
	mtk.manpages@...il.com, linux-fsdevel@...r.kernel.org,
	xfs@....sgi.com, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ashish Sangwan <a.sangwan@...sung.com>
Subject: Re: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE
 for fallocate

On Tue, Feb 18, 2014 at 10:05:49AM +0100, Lukáš Czerner wrote:
> On Wed, 12 Feb 2014, Namjae Jeon wrote:
> 
> > Date: Wed, 12 Feb 2014 11:28:35 +0900
> > From: Namjae Jeon <linkinjeon@...il.com>
> > To: Lukáš Czerner <lczerner@...hat.com>
> > Cc: viro@...iv.linux.org.uk, david@...morbit.com, bpm@....com, tytso@....edu,
> >     adilger.kernel@...ger.ca, jack@...e.cz, mtk.manpages@...il.com,
> >     linux-fsdevel@...r.kernel.org, xfs@....sgi.com,
> >     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
> >     Namjae Jeon <namjae.jeon@...sung.com>,
> >     Ashish Sangwan <a.sangwan@...sung.com>
> > Subject: Re: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE
> >     for fallocate
> > 
> > 2014-02-11 20:59 GMT+09:00, Lukáš Czerner <lczerner@...hat.com>:
> > > On Sun, 2 Feb 2014, Namjae Jeon wrote:
> > >
> > >> Date: Sun,  2 Feb 2014 14:44:34 +0900
> > >> From: Namjae Jeon <linkinjeon@...il.com>
> > >> To: viro@...iv.linux.org.uk, david@...morbit.com, bpm@....com,
> > >> tytso@....edu,
> > >>     adilger.kernel@...ger.ca, jack@...e.cz, mtk.manpages@...il.com
> > >> Cc: linux-fsdevel@...r.kernel.org, xfs@....sgi.com,
> > >>     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
> > >>     Namjae Jeon <linkinjeon@...il.com>, Namjae Jeon
> > >> <namjae.jeon@...sung.com>,
> > >>     Ashish Sangwan <a.sangwan@...sung.com>
> > >> Subject: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE
> > >> for
> > >>     fallocate
> > >>
> > >> From: Namjae Jeon <namjae.jeon@...sung.com>
> > >>
> > >> Add support FALLOC_FL_COLLAPSE_RANGE for fallocate
> > Hi Lukas.
> > >
> > > Description is missing here, please provide FALLOC_FL_COLLAPSE_RANGE
> > > description so people know what it's supposed to be doing.
> > >
> > > more comments bellow.
> > Okay, I will udpate.
> > >
> > > Thanks!
> > > -Lukas
> 
> Hi,
> 
> you may have noticed my patches for new FALLOC_FL_ZERO_RANGE
> fallocate flag. This changes things around the same area as your
> patches does so we should probably figure out which are going to
> land in first and then rebase the other on top of that.
> 
> One concern I have is that I have not seen any tests provided to
> verify the feature. But I just may have missed it. Do you have any
> xfstests test or at least fsx and fsstress patches to provide
> support for testing FALLOC_FL_COLLAPSE_RANGE ? Patches for
> util_linux might also be handy.

There were 5 xfstests patches posted that used the
_test_generic_punch infrastructure to test this functionality.
See the december 08 index here, search for "shared/00[1-5]":

http://oss.sgi.com/archives/xfs/2013-12/index.html

They need a little rework, but otherwise the test code is there.
Having the feature added to fsx and fsstress would probably be a
good idea, though.

Cheers,

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