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 [EMAIL PROTECTED] Usergroup [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
