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 18:13:26 +0300
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To: =?UTF-8?Q?Du=C5=A1an_=C4=8Coli=C4=87?= <dusanc@gmail.com>
Cc: Edward Shishkin <edward.shishkin@gmail.com>, reiserfs-devel <reiserfs-devel@vger.kernel.org>


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On 2015-07-05 at 16:06 +0200, Du=C5=A1an =C4=8Coli=C4=87 wrote:
> On 5 Jul 2015 15:12, "Ivan Shapovalov" <intelfx100@gmail.com> wrote:
> >=20
> > 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=20
> > > > block,
> > > >      infer granularity from the zero-filled region size.
> > >=20
> > >=20
> > > mkfs seems to be more suitable for this funny business
> >=20
> > Yeah, sure. So... new superblock format with two extra fields?
> >=20
> But what happens when someone makes an image of whole partition and=20
> uses it
> on new different ssd?

Maybe we can make a tunefs.reiser4 (just) for that purpose.

--=20
Ivan Shapovalov / intelfx /

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