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.
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. In -current physical block numbers are now 64 bits, removing the 2TB limit, and UFS2 uses 64 bit block numbers, removing the filesystem-imposed 2TB limit. I'm not sure how much more work there is to go in this area, you could ask Poul or Kirk. -Matt To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message