[PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate

[Lukáš Czerner]

On Wed, 12 Feb 2014, Namjae Jeon wrote:

> Date: Wed, 12 Feb 2014 11:28:35 +0900
> From: Namjae Jeon <linkinjeon at gmail.com>
> To: Lukáš Czerner <lczerner at redhat.com>
> Cc: viro at zeniv.linux.org.uk, david at fromorbit.com, bpm at sgi.com, tytso at mit.edu,
>     adilger.kernel at dilger.ca, jack at suse.cz, mtk.manpages at gmail.com,
>     linux-fsdevel at vger.kernel.org, xfs at oss.sgi.com,
>     linux-ext4 at vger.kernel.org, linux-kernel at vger.kernel.org,
>     Namjae Jeon <namjae.jeon at samsung.com>,
>     Ashish Sangwan <a.sangwan at samsung.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 at redhat.com>:
> > On Sun, 2 Feb 2014, Namjae Jeon wrote:
> >
> >> Date: Sun,  2 Feb 2014 14:44:34 +0900
> >> From: Namjae Jeon <linkinjeon at gmail.com>
> >> To: viro at zeniv.linux.org.uk, david at fromorbit.com, bpm at sgi.com,
> >> tytso at mit.edu,
> >>     adilger.kernel at dilger.ca, jack at suse.cz, mtk.manpages at gmail.com
> >> Cc: linux-fsdevel at vger.kernel.org, xfs at oss.sgi.com,
> >>     linux-ext4 at vger.kernel.org, linux-kernel at vger.kernel.org,
> >>     Namjae Jeon <linkinjeon at gmail.com>, Namjae Jeon
> >> <namjae.jeon at samsung.com>,
> >>     Ashish Sangwan <a.sangwan at samsung.com>
> >> Subject: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE
> >> for
> >>     fallocate
> >>
> >> From: Namjae Jeon <namjae.jeon at samsung.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.

Thanks!
-Lukas