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
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