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Date:      Mon, 25 Apr 2011 10:54:02 -0600
From:      Warner Losh <imp@bsdimp.com>
To:        Alexander Motin <mav@freebsd.org>
Cc:        src-committers@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org>, svn-src-all@freebsd.org, "Bjoern A. Zeeb" <bz@freebsd.org>, Robert Watson <rwatson@freebsd.org>, svn-src-head@freebsd.org
Subject:   Re: svn commit: r220982 - in head: . sys/amd64/conf sys/arm/conf sys/conf sys/i386/conf sys/ia64/conf sys/mips/conf sys/mips/malta sys/pc98/conf sys/powerpc/conf sys/sparc64/conf sys/sun4v/conf
Message-ID:  <67F62848-FAA3-4C46-A95A-DA7C82281898@bsdimp.com>
In-Reply-To: <4DB5A166.9010302@FreeBSD.org>
References:  <201104240858.p3O8wwqT024628@svn.freebsd.org> <alpine.BSF.2.00.1104241140070.36270@fledge.watson.org> <4DB441B0.8020906@FreeBSD.org> <CD028561-B550-4896-BE65-7C827BE6A34A@FreeBSD.org> <20110425134531.GA4391@garage.freebsd.pl> <50385B7B-7EC8-4BC3-8F88-83F9EB4096FB@bsdimp.com> <4DB5A166.9010302@FreeBSD.org>

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On Apr 25, 2011, at 10:29 AM, Alexander Motin wrote:

> Warner Losh wrote:
>> On Apr 25, 2011, at 7:45 AM, Pawel Jakub Dawidek wrote:
>>> On Sun, Apr 24, 2011 at 06:59:40PM +0000, Bjoern A. Zeeb wrote:
>>>> I had been pondering devfs "link"s myself, the problem is that from =
the rc
>>>> framework they come too late.  If you can add a simple .ko that =
does it
>>>> programmatically on 9 that would be great.  The problem is that =
after booting
>>>> the new kernel you don't know whether people had ATA_STATIC on or =
not, so
>>>> we'd have to go with the defaults, that were in 8.x (and an extra =
tunable to
>>>> flip the logic maybe)?
>>> We do know that people have ATA_STATIC_ID, because if they don't, =
this
>>> means they have their custom kernel config which doesn't contain =
ATA_CAM
>>> and when they will use it next time they recompile their kernel they
>>> will still have /dev/adX entries.
>>>=20
>>> Also, as Alexander already noted, because of all the problems with =
ATA
>>> naming over the years and for other reasons too, people often =
hardcode
>>> provider name in various GEOM classes metadata, so symlink won't =
help.
>>=20
>> Do we have a short list of the places to look?=20
>=20
> Quick man pages grepping shows that at least gmirror, gstripe, graid3,
> gjournal, gvirstor, gconcat, gshsec support provider names hardcoding.
> For gmirror and graid3 present status can be obtained by: `gXXX list |
> egrep "Flags: .*HARDCODED"`. For gvirstor, gshsec, gstripe and =
gconcat:
> `gXXX dump adX | egrep "Hardcoded provider: ad"`. For gjournal:
> `gjournal dump adX | egrep "hcprovider: ad"`.

That wouldn't be too horrible...

>> A lot of this could be done with a script that gets run at =
installworld and boot time to hunt down the old cases and report them to =
the user before they upgrade their kernel (but this would mean backing =
out the GENERIC change for a while to give people a chance to upgrade to =
label-based provisioning...
>=20
> If I understand idea right, independently of how much we delay it, =
there
> will be some people who not updated during that window to get in code
> detecting it during boot. Hardly many people of target auditory =
updating
> their systems each month. Same time some checks indeed could be done =
in
> installkernel.

We'd have to delay it at least a month, if not more.  However, the time =
to have done these checks were 8.1ish rather than 9.0 nearing =
code-freezeish.  I'd thought there was going to be better compatibility =
last year at this time, or I'd have pushed this idea harder in the =
community...

And yes, I'd envisioned installkernel also doing these checks, just to =
be complete and prevent foot-shooting.  At this point, it's all we have. =
 For the 9.0 install, we'll likely need to do a subset of this as people =
import their gmirrors created with 8.x...

Warner


>=20
> --=20
> Alexander Motin
>=20
>=20




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