Date: Mon, 25 Jan 2010 09:45:23 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Andriy Gapon <avg@icyb.net.ua> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, freebsd-questions@freebsd.org, Robert Noland <rnoland@freebsd.org> Subject: Re: Loader, MBR and the boot process Message-ID: <4B5D6833.6050200@infracaninophile.co.uk> In-Reply-To: <4B5D6207.9090105@icyb.net.ua> References: <cf9b1ee01001211957j43a9d6a9j3d1e29d19aebf418@mail.gmail.com> <20100122041237.GA22312@gothschlampen.com> <cf9b1ee01001212049u6cffd8abo9efa380a8efa9609@mail.gmail.com> <cf9b1ee01001212102r70b88806m21b167a2aa833362@mail.gmail.com> <20100124092947.B72039@starfire.mn.org> <cf9b1ee01001240759j2476cf3es2babd8b32a90f9aa@mail.gmail.com> <201001242057.o0OKvHUE089237@drugs.dv.isc.org> <1264387282.2869.24.camel@balrog.2hip.net> <4B5D6207.9090105@icyb.net.ua>
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[-- Attachment #1 --] Andriy Gapon wrote: > on 25/01/2010 04:41 Robert Noland said the following: >> On Mon, 2010-01-25 at 07:57 +1100, Mark Andrews wrote: >>> offset The offset of the start of the partition from the beginning of >>> the drive in sectors, or * to have bsdlabel calculate the correct >>> offset to use (the end of the previous partition plus one, ignor- >>> ing partition `c'. For partition `c', * will be interpreted as >>> an offset of 0. The first partition should start at offset 16, >>> because the first 16 sectors are reserved for metadata. >> Ok, now this has my attention... My gut feeling right now is that this >> is a bug in geom_part_bsd. I don't understand why the label isn't >> protected. (Adding -b 16 when adding the swap partition fixes this) >> Another project to goes on my list... >> >> If anyone knows why this is done like this... please share. > > I presume that this is for purely historic reasons. > I believe this has been known about since 5.x days: http://www.freebsd.org/cgi/query-pr.cgi?pr=72812 As far as I recall, sometime around 6.1-RELEASE this should have been fixed. It certainly seems to be the case that it is harmless to have a plain swap partition start at offset 0, but anything else, like encrypted swap or putting a filesystem there needs the 16 sector offset. Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREIAAYFAktdaDwACgkQ8Mjk52CukIyGdQCfcUh+FFXVu1qBJOvJS6c+BNLD YaEAnRvo4aW3DSv+eZrW88/TMtt/848q =Q6zY -----END PGP SIGNATURE-----help
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