Date: Mon, 25 Apr 2011 17:11:02 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Alexander Motin <mav@freebsd.org> Cc: "Bjoern A. Zeeb" <bz@freebsd.org>, "Andrey V. Elsukov" <bu7cher@yandex.ru>, Robert Watson <rwatson@freebsd.org>, FreeBSD-Current <freebsd-current@freebsd.org> Subject: Re: Old ATA disk names emulation [Was: Switch from legacy ata(4) to CAM-based ATA] Message-ID: <20110425141102.GJ48734@deviant.kiev.zoral.com.ua> In-Reply-To: <4DB5685A.8010803@FreeBSD.org> References: <4DB54BA9.5050901@FreeBSD.org> <4DB55E86.7000805@yandex.ru> <4DB5685A.8010803@FreeBSD.org>
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--BbvjD0mU+7XPw0yH Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Apr 25, 2011 at 03:26:02PM +0300, Alexander Motin wrote: > Andrey V. Elsukov wrote: > > On 25.04.2011 14:23, Alexander Motin wrote: > >> What will not work: > >> - old device names won't be seen inside GEOM, so users who hardcoded > >> provider names in gmirror/gstripe/... metadata (not the default > >> behavior) are still in trouble. > >> - patch mimics ATA_STATIC_ID behavior, if user had custom kernel > >> without it, he should update device names manually. > >> - it won't work for users with hot-unplugging ATA controllers (not > >> devices), but I believe it is really rare case. > >> - low-level tools, such as smartmontools, won't be able to work with > >> alias devices, as background ada driver doesn't implements legacy > >> ioctls. May be I could partially fix this. > >> > >> Except those, I think this patch should work for the most of users. > >> > >> Any more objections/ideas? Is this an acceptable solution? > >=20 > > what about new GEOM class? You can create new class instance after > > disk_alloc(), attach it to the new disk and create provider with old-st= yle > > name. It seems this class will be very simple. >=20 > It sounds like less dirty option. I'll try it. Thank you. Won't > re-providing exactly the same device into GEOM create some problems? > glabel and co will connect to each of them (original and legacy) and > report two equal sets of labels. Can you limit the real functionality of this new class to the calls to make_dev_alias(9) ? Ideally, I would think about some extension of the core GEOM, which would take some parameter, lets call it alias name, and will acompany the existing make_dev() calls with parallel make_dev_alias(). --BbvjD0mU+7XPw0yH Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iEYEARECAAYFAk21gPYACgkQC3+MBN1Mb4jyTwCghkGhAwheCpNcp+n2J6n0CTV6 jIsAnj+t7ucjim1G2WKmLB6W3yxGOqwC =6cVV -----END PGP SIGNATURE----- --BbvjD0mU+7XPw0yH--
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