Re: [PATCH] tmpfs: support SEEK_DATA and SEEK_HOLE (reprise)

[Hugh Dickins]

On Thu, 29 Nov 2012, Dave Chinner wrote:
> 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@xxxxxxxxxxxxxxxxxxxx: fix warning with CONFIG_TMPFS=n]
> > Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
> > ---
> 
> Does it pass the seek hole/data tests (285, 286) in xfstests?

It did before and ... [install this, install that, install tother]
... yes, it still passes those tests - using Boris Ranto's patch
extending xfstests to include tmpfs.

Though I'd have even more confidence if they gave a little pat on
the back for doing better than the no-op default, which also passes.

Hugh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/