From: "Lukáš Czerner" <lczerner-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Michael Kerrisk
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
tytso-3s7WtUTddSA@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
xfs-VZNHf3L845pBDgjK7y7TUQ@public.gmane.org
Subject: Re: [PATCH 0/6][RFC] Introduce FALLOC_FL_ZERO_RANGE flag for fallocate
Date: Wed, 16 Apr 2014 12:43:09 +0200 (CEST) [thread overview]
Message-ID: <alpine.LFD.2.00.1404161242480.2586@localhost.localdomain> (raw)
In-Reply-To: <20140416063618.GA12498-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
On Tue, 15 Apr 2014, Christoph Hellwig wrote:
> Date: Tue, 15 Apr 2014 23:36:18 -0700
> From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
> To: Lukas Czerner <lczerner-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Cc: Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
> linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, tytso-3s7WtUTddSA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
> xfs-VZNHf3L845pBDgjK7y7TUQ@public.gmane.org
> Subject: Re: [PATCH 0/6][RFC] Introduce FALLOC_FL_ZERO_RANGE flag for
> fallocate
>
> On Mon, Feb 17, 2014 at 04:08:17PM +0100, Lukas Czerner wrote:
> > Introduce new FALLOC_FL_ZERO_RANGE flag for fallocate. This has the same
> > functionality as xfs ioctl XFS_IOC_ZERO_RANGE.
>
> Lukas, can you please also send a man page update for
> FALLOC_FL_ZERO_RANGE now that is has been merged?
Right, I'll do that.
Thanks!
-Lukas
>
> >
> > It can be used to convert a range of file to zeros preferably without
> > issuing data IO. Blocks should be preallocated for the regions that span
> > holes in the file, and the entire range is preferable converted to
> > unwritten extents - even though file system may choose to zero out the
> > extent or do whatever which will result in reading zeros from the range
> > while the range remains allocated for the file.
> >
> > This can be also used to preallocate blocks past EOF in the same way as
> > with fallocate. Flag FALLOC_FL_KEEP_SIZE which should cause the inode
> > size to remain the same.
> >
> > You can test this feature yourself using xfstests, of fallocate(1) however
> > you'll need patches for util_linux, xfsprogs and xfstests which you
> > can find here:
> >
> > http://people.redhat.com/lczerner/zero_range/
> --
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prev parent reply other threads:[~2014-04-16 10:43 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-17 15:08 [PATCH 0/6][RFC] Introduce FALLOC_FL_ZERO_RANGE flag for fallocate Lukas Czerner
2014-02-17 15:08 ` [PATCH 1/6] ext4: Update inode i_size after the preallocation Lukas Czerner
2014-02-17 23:12 ` Andreas Dilger
2014-02-17 23:21 ` Theodore Ts'o
2014-02-18 8:13 ` Lukáš Czerner
2014-02-17 15:08 ` [PATCH 2/6] ext4: refactor ext4_fallocate code Lukas Czerner
2014-02-18 8:25 ` jon ernst
2014-02-17 15:08 ` [PATCH 3/6] ext4: translate fallocate mode bits to strings Lukas Czerner
2014-02-17 15:08 ` [PATCH 4/6] fs: Introduce FALLOC_FL_ZERO_RANGE flag for fallocate Lukas Czerner
2014-02-18 2:51 ` Dave Chinner
2014-02-18 8:10 ` Lukáš Czerner
2014-02-17 15:08 ` [PATCH 5/6] ext4: " Lukas Czerner
2014-02-18 8:27 ` jon ernst
2014-02-17 15:08 ` [PATCH 6/6] xfs: Add support for FALLOC_FL_ZERO_RANGE Lukas Czerner
2014-02-18 4:51 ` Dave Chinner
2014-02-18 1:01 ` [PATCH 0/6][RFC] Introduce FALLOC_FL_ZERO_RANGE flag for fallocate Dave Chinner
2014-02-18 8:33 ` Dave Chinner
2014-02-18 9:09 ` Lukáš Czerner
2014-02-18 9:41 ` Dave Chinner
2014-02-18 12:04 ` Lukáš Czerner
2014-02-18 14:23 ` Theodore Ts'o
2014-02-18 14:42 ` Lukáš Czerner
2014-02-19 0:33 ` Theodore Ts'o
2014-02-19 14:52 ` Dongsu Park
2014-02-19 15:18 ` Lukáš Czerner
2014-02-19 15:51 ` Dongsu Park
2014-02-20 11:16 ` Lukáš Czerner
2014-02-24 1:07 ` Dave Chinner
2014-02-24 13:47 ` Lukáš Czerner
2014-04-16 6:36 ` Christoph Hellwig
[not found] ` <20140416063618.GA12498-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2014-04-16 10:43 ` Lukáš Czerner [this message]
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