Date: Sat, 24 Jun 2006 05:49:18 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: "R. B. Riddick" <arne_woerner@yahoo.com> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: Journaling UFS with gjournal. Message-ID: <20060623194917.GB747@turion.vk2pj.dyndns.org> In-Reply-To: <20060623083838.86539.qmail@web30308.mail.mud.yahoo.com> References: <20060623082209.GD13474@nevermind.kiev.ua> <20060623083838.86539.qmail@web30308.mail.mud.yahoo.com>
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--HlL+5n6rz5pIUxbD Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, 2006-Jun-23 01:38:38 -0700, R. B. Riddick wrote: >--- Alexandr Kovalenko <never@nevermind.kiev.ua> wrote: >> Is it safe to do so on existing filesystem (if I'm using 2nd partition f= or >> journal)? =2E.. >If your existing file system needs its last sector, then it wont work. If = it >does not need it, then it might work (although fsck does not check for a >raw-device shrinkage - I think)... In my experience, the last partition in a disk slice normally has an odd number of sectors and UFS definitely can't handle anything smaller than a fragment (which defaults to 2K) - and I suspect that UFS can't handle a trailing fragment. In this case, the last sector is definitely unused. I may be wrong but I don't think it's possible for the last sector of a partition to be FS metadata because the metadata is always at the beginning of a CG and newfs won't create a CG unless there's some space for data in the CG. If there are an integral number of fragments (or maybe blocks), then marking the last fragment as 'bad' would seem an adequate solution - the FS will ignore that block but anything below the filesystem won't see the "bad block" marker. --=20 Peter Jeremy --HlL+5n6rz5pIUxbD Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEnEW8/opHv/APuIcRAjoPAJ0f90leQiv+V3Xu4VpYvnBMZT+XwQCfZIQc A3v0WxoDBaIt5pM5omNJN58= =aq1w -----END PGP SIGNATURE----- --HlL+5n6rz5pIUxbD--
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