[Syllable-kernel] ftruncate() for AFS

[Daniel G. <da...@fp...>]

Hi, all

Here's an updated ftruncate() for AFS>  It works well (in that it
truncates/expands to the right size, zero fills, and doesn't destroy my
filesystem) in my tests.  I'm going to write a more extensive stress
test than my three random truncate loops soon, but I think it stable
enough to be posted.

Daniel