From owner-freebsd-emulation@FreeBSD.ORG Tue Jul 26 21:22:38 2011 Return-Path: Delivered-To: freebsd-emulation@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 33A86106566C; Tue, 26 Jul 2011 21:22:38 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id C53DC8FC12; Tue, 26 Jul 2011 21:22:37 +0000 (UTC) Received: from deviant.kiev.zoral.com.ua (root@deviant.kiev.zoral.com.ua [10.1.1.148]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id p6QLMY2k067067 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 27 Jul 2011 00:22:34 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.4/8.14.4) with ESMTP id p6QLMYLu092585; Wed, 27 Jul 2011 00:22:34 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.4/8.14.4/Submit) id p6QLMYgE092583; Wed, 27 Jul 2011 00:22:34 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Wed, 27 Jul 2011 00:22:34 +0300 From: Kostik Belousov To: Juergen Lock Message-ID: <20110726212234.GP17489@deviant.kiev.zoral.com.ua> References: <1311574719.49706.YahooMailClassic@web122313.mail.ne1.yahoo.com> <4E2D1275.8000305@yandex.ru> <20110726180335.GA82849@triton8.kn-bremen.de> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="AfN0ITkBdUBwMG9P" Content-Disposition: inline In-Reply-To: <20110726180335.GA82849@triton8.kn-bremen.de> User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-3.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00, DNS_FROM_OPENWHOIS autolearn=no version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: freebsd-hackers@freebsd.org, freebsd-emulation@freebsd.org Subject: Re: wdrain vs. fuse/ggate (was: Re: mount vdi) X-BeenThere: freebsd-emulation@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Development of Emulators of other operating systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Jul 2011 21:22:38 -0000 --AfN0ITkBdUBwMG9P Content-Type: text/plain; charset=koi8-r Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jul 26, 2011 at 08:03:35PM +0200, Juergen Lock wrote: > On Mon, Jul 25, 2011 at 06:31:36PM -0500, Brandon Gooch wrote: > > 2011/7/25 Andrey V. Elsukov : > > > On 25.07.2011 10:18, Joe Sciulli wrote: > > >> Is it possible to mount virtualbox vdi file on the FreeBSD host? =9A= This appears to be doable on > > >> windows and linux hosts, which basically is done in two steps: 1. fi= nd offset in the image. 2. > > >> mount the image with that offset. > > >> > > >> I'm trying to do the same thing on FreeBSD, and found the undocument= ed and deprecated command > > >> still works: > > >> > > >> VBoxManage internalcommands dumphdinfo freebsd_home.vdi > > >> > > >> I got the following for the virtual disk image holding the /home (no= root hence no MBR) disk for > > >> a FreeBSD guest: > > >> > > >> Header: offBlocks=3D4096 offData=3D28672 > > >> > > >> Then attempt to mount it: > > >> > > >> mdconfig -a -t vnode -f /tmp/freebsd_home_56.vdi -u 0 mount /dev/md0= /tmp/aaa/ mount -t cd9660 > > >> /dev/md0 /tmp/aaa/ > > >> > > >> unfortunately both the above two mount commands failed with "Invalid= argument". =9AI tried > > >> skip=3D28672 to no avail as well. =9AAnything did I do wrong? > > > > > > I have not any Vbox images with fixed size, but i tried this: > > > # mdconfig -f 10G_GPT_UFS.vdi > > > # gnop create -v -o 41472 /dev/md0 > > > > > > where 41472 is offData value. After that md0.nop was tasted and repor= ts about invalid GPT. > > > So, i think if your image is fixed size disk yout can try this method= and mount UFS (not cd9660). > > > > > > -- > > > WBR, Andrey V. Elsukov > >=20 > > There was a CFT sent out a while back about a fuse module for mounting > > vdi images: > >=20 > > http://lists.freebsd.org/pipermail/freebsd-emulation/2010-September/007= 964.html > >=20 > > Not sure about the state of this now though... >=20 > Yeah sorry I never got back to this after getting reports that > writes are stuck in wdrain... [1] I guess what happens is the > vdfuse process wants to write many(?) more blocks than the number > that got queued by the original fuse request and/or too many writes > get queued up at once before the vdfuse process gets to handle them > (trying to increase runningbufspace even more), and thus there is > deadlock. :( So my question for -hackers is, does anyone have a > clever idea how to fix this? Should the fuse requests for this be > exempted from the wdrain bookkeeping so that only the actual writes > by the vdfuse process get counted, and if yes, how would I best > accomplish this? >=20 > Thanx! :) > Juergen Excluding any buffers from runningbufspace is absolutely wrong. You will get another deadlock due to excessive pressure on the buffer space. --AfN0ITkBdUBwMG9P Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iEYEARECAAYFAk4vMBkACgkQC3+MBN1Mb4iB9ACgl7uXmuUfe1mmSVbQcAeWKwgd VPoAoLtD8YeHUQKqbJBWJP1fvywI8v0i =/Bak -----END PGP SIGNATURE----- --AfN0ITkBdUBwMG9P--