Date: Sun, 7 Jul 2002 02:43:04 +0200 From: Bernd Walter <ticso@cicely5.cicely.de> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Bernd Walter <ticso@cicely5.cicely.de>, Terry Lambert <tlambert2@mindspring.com>, Darren Pilgrim <dmp@pantherdragon.org>, ticso@cicely.de, freebsd-hackers@FreeBSD.ORG Subject: Re: How does swap work address spacewise? Message-ID: <20020707004304.GL23704@cicely5.cicely.de> In-Reply-To: <20020707001019.GK23704@cicely5.cicely.de> References: <20020705234126.GA12183@atrbg11.informatik.tu-muenchen.de> <3D2640A7.3EA2236B@pantherdragon.org> <20020706020656.GL48977@cicely5.cicely.de> <3D2762FE.9D9E0378@pantherdragon.org> <20020706220720.GG23704@cicely5.cicely.de> <3D277274.B5F3CE58@pantherdragon.org> <3D2776BE.A39A1110@mindspring.com> <20020706231346.GJ23704@cicely5.cicely.de> <200207062342.g66NgMri063859@apollo.backplane.com> <20020707001019.GK23704@cicely5.cicely.de>
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On Sun, Jul 07, 2002 at 02:10:19AM +0200, Bernd Walter wrote: > On Sat, Jul 06, 2002 at 04:42:22PM -0700, Matthew Dillon wrote: > > Negative block numbers are used by UFS to represent the indirect blocks > > associated with a file, while positive block numbers represent the > > contents of the file. > > I never saw any negative block numbers in on-disc structures. > Now I wonder if it was just hidden behind macros. > What is the reason to handle it that way? > Do you have some code reference for homework? OK - I've found it used for incore data and understand why it's done. > > These are logical block numbers, which are fragment-sized (1K typically). > > So, 2^31 x 1K = 2TB. > > > > Physical block numbers are 512-byte sized, with a range of 2^32 > > in -stable. This also winds up being 2TB. So increasing the fragment > > size does not help in -stable. > > It's a proven fact that there is a 1T limit somewhere which was > explained with physical block numbers beeing signed. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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