linux-ext4 - Re: [PATCH 07/14] libext2fs: support allocating uninit blocks in bmap2()

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Message-ID: <20150517005441.GF4489@thunk.org>
Date:	Sat, 16 May 2015 20:54:41 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 07/14] libext2fs: support allocating uninit blocks in
 bmap2()

On Wed, May 13, 2015 at 05:21:53PM -0700, Darrick J. Wong wrote:
> As part of supporting fallocate-like functionality, extend
> ext2fs_bmap() with two flags -- BMAP_UNINIT and BMAP_ZERO.  The first
> will cause it to mark/set a block uninitialized, if it's part of an
> extent based file.  For a block mapped file, the mapping is put in,
> but there is no way to remember the uninitialized status.  The second
> flag causes the block to be zeroed to support the use case of
> emulating uninitialized blocks on a block-map file by zeroing them.
> 
> Eventually fallocate or fuse2fs or somebody will use these.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>

Thanks, applied.

						- Ted
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