* Re: [PATCH 0/6][RFC] Introduce FALLOC_FL_ZERO_RANGE flag for fallocate
[not found] ` <20140416063618.GA12498-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
@ 2014-04-16 10:43 ` Lukáš Czerner
0 siblings, 0 replies; 2+ messages in thread
From: Lukáš Czerner @ 2014-04-16 10:43 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Michael Kerrisk, linux-man-u79uwXL29TY76Z2rM5mHXA,
linux-ext4-u79uwXL29TY76Z2rM5mHXA, tytso-3s7WtUTddSA,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA, xfs-VZNHf3L845pBDgjK7y7TUQ
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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