linux-kernel - Re: [PATCH] tmpfs: support SEEK_DATA and SEEK

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Message-ID: <20121129024446.GY6434@dastard>
Date:	Thu, 29 Nov 2012 13:44:46 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Ts'o <tytso@....edu>,
	Zheng Liu <wenqing.lz@...bao.com>,
	Jeff liu <jeff.liu@...cle.com>,
	Jim Meyering <jim@...ering.net>,
	Paul Eggert <eggert@...ucla.edu>,
	Christoph Hellwig <hch@...radead.org>,
	Josef Bacik <josef@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andreas Dilger <adilger@...ger.ca>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Chris Mason <chris.mason@...ionio.com>,
	Sunil Mushran <sunil.mushran@...cle.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] tmpfs: support SEEK_DATA and SEEK_HOLE (reprise)

On Wed, Nov 28, 2012 at 05:22:03PM -0800, Hugh Dickins wrote:
> Revert 3.5's f21f8062201f ("tmpfs: revert SEEK_DATA and SEEK_HOLE")
> to reinstate 4fb5ef089b28 ("tmpfs: support SEEK_DATA and SEEK_HOLE"),
> with the intervening additional arg to generic_file_llseek_size().
> 
> In 3.8, ext4 is expected to join btrfs, ocfs2 and xfs with proper
> SEEK_DATA and SEEK_HOLE support; and a good case has now been made
> for it on tmpfs, so let's join the party.
> 
> It's quite easy for tmpfs to scan the radix_tree to support llseek's new
> SEEK_DATA and SEEK_HOLE options: so add them while the minutiae are still
> on my mind (in particular, the !PageUptodate-ness of pages fallocated but
> still unwritten).
> 
> [akpm@...ux-foundation.org: fix warning with CONFIG_TMPFS=n]
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> ---

Does it pass the seek hole/data tests (285, 286) in xfstests?

Cheers,

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