posix_fallocate(2)

[mdf at FreeBSD.org]

For work we need a functionality in our filesystem that is pretty much
like posix_fallocate(2), so we're using the name and I've added a
default VOP_ALLOCATE definition that does the right, but dumb, thing.

The most recent mention of this function in FreeBSD was another thread
lamenting it's failure to exist:
http://lists.freebsd.org/pipermail/freebsd-ports/2010-February/059268.html

The attached files are the core of the kernel implementation of the
syscall and a default VOP for any filesystem not supporting
VOP_ALLOCATE, which allows the syscall to work as expected but in a
non-performant manner.  I didn't see this syscall in NetBSD or
OpenBSD, so I plan to add it to the end of our syscall table.

What I wanted to check with -arch about was:

1) is there still a desire for this syscall?
2) is this naive implementation useful enough to serve as a default
for all filesystems until someone with more knowledge fills them in?
3) are there any obvious bugs or missing elements?

Thanks,
matthew
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