From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ivan Shapovalov <intelfx100@gmail.com>
Subject: Re: [patch] reiser4: port for Linux-4.1
Date: Sun, 05 Jul 2015 16:08:32 +0300
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To: Edward Shishkin <edward.shishkin@gmail.com>, ReiserFS development mailing list <reiserfs-devel@vger.kernel.org>


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On 2015-07-05 at 02:33 +0800, Edward Shishkin wrote:
> On 07/05/2015 01:53 AM, Ivan Shapovalov wrote:
> > On 2015-07-04 at 15:53 +0800, Edward Shishkin wrote:
> > >=20
> > > [...]
> > > And how to test directly at mount time?
> > Something along the lines of
> > - allocate 1 MiB of contiguous space
> > - fill it with non-zeros
> > - for N =3D 1, 2, 4, ...:
> >    - discard N sectors from the contiguous space
> >    - check if anything in the discarded space became zero-filled
> >    - if it did, infer alignnment from the first zero-filled block,
> >      infer granularity from the zero-filled region size.
>=20
>=20
> mkfs seems to be more suitable for this funny business

Yeah, sure. So... new superblock format with two extra fields?

>=20
>=20
> > > It seems that nobody cares about it..
> > It's just ATA interface does not provide necessary data.
>=20
>=20
> OK, so our precise discard extension is waiting for the
> best times..
I hope we'll be able to merge it eventually (esp. the final patch which
accounts for non-idempotence of check-and-allocate-blocks).

Thanks,
--=20
Ivan Shapovalov / intelfx /

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