From owner-freebsd-geom@FreeBSD.ORG  Sun Apr 22 12:39:57 2007
Return-Path: <owner-freebsd-geom@FreeBSD.ORG>
X-Original-To: freebsd-geom@freebsd.org
Delivered-To: freebsd-geom@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 0DF7716A402
	for <freebsd-geom@freebsd.org>; Sun, 22 Apr 2007 12:39:57 +0000 (UTC)
	(envelope-from pjd@garage.freebsd.pl)
Received: from mail.garage.freebsd.pl (arm132.internetdsl.tpnet.pl
	[83.17.198.132])
	by mx1.freebsd.org (Postfix) with ESMTP id ABDEA13C48A
	for <freebsd-geom@freebsd.org>; Sun, 22 Apr 2007 12:39:56 +0000 (UTC)
	(envelope-from pjd@garage.freebsd.pl)
Received: by mail.garage.freebsd.pl (Postfix, from userid 65534)
	id 6BDCE45CD9; Sun, 22 Apr 2007 14:39:54 +0200 (CEST)
Received: from localhost (public-gprs38729.centertel.pl [91.94.23.121])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by mail.garage.freebsd.pl (Postfix) with ESMTP id 6B7BB45696;
	Sun, 22 Apr 2007 14:39:44 +0200 (CEST)
Date: Sun, 22 Apr 2007 14:38:52 +0200
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
To: Ivan Voras <ivoras@fer.hr>
Message-ID: <20070422123852.GA52622@garage.freebsd.pl>
References: <f0eb3i$97s$2@sea.gmane.org>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="jRHKVT23PllUwdXP"
Content-Disposition: inline
In-Reply-To: <f0eb3i$97s$2@sea.gmane.org>
X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc
X-OS: FreeBSD 7.0-CURRENT i386
User-Agent: mutt-ng/devel-r804 (FreeBSD)
X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on 
	mail.garage.freebsd.pl
X-Spam-Level: 
X-Spam-Status: No, score=-2.5 required=3.0 tests=BAYES_00,RCVD_IN_NJABL_DUL 
	autolearn=no version=3.0.4
Cc: freebsd-geom@freebsd.org
Subject: Re: gjournal & async
X-BeenThere: freebsd-geom@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: GEOM-specific discussions and implementations
	<freebsd-geom.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-geom>
List-Post: <mailto:freebsd-geom@freebsd.org>
List-Help: <mailto:freebsd-geom-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 22 Apr 2007 12:39:57 -0000


--jRHKVT23PllUwdXP
Content-Type: text/plain; charset=iso-8859-2
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Sun, Apr 22, 2007 at 02:43:29AM +0200, Ivan Voras wrote:
> How does gjournal guarantee corectness if UFS is mounted async? AFAIK
> the "async" handling of IO requests is done by the UFS, the writes are
> not rescheduled at the GEOM layer?

GJournal has some minimum knowledge about VFS. Before it does journal
switch, it synchronize and suspends file system. This way we can be sure
everything is on disk in a consistent state.

--=20
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

--jRHKVT23PllUwdXP
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (FreeBSD)

iD8DBQFGK1dcForvXbEpPzQRAuP0AJ9eoDQFYDxPcmcNwtXK9aF8GSPF9wCghcQF
sRXrTWffigHFo0Dq7RqBhmo=
=e3hd
-----END PGP SIGNATURE-----

--jRHKVT23PllUwdXP--