Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

fsx: more consistent debug output with -[RWU]

MFC after: 2 weeks

fsx: bounds check the inputs

In particular, don't allow the user to specify a file size that can't be
expressed as an int, since fsx's random-number generator only has a 32
bit range.

MFC after: 2 weeks

fsx: fix build with WARNS=6

* signed/unsigned comparisons
* use standard warn(3)
* Suppress warnings about local vars and funcs not declared static
* const-correctness
* declaration shadows a variable in the global scope

Reviewed by: kevans
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D26516

fsx: seed more randomly with the -S0 option

When using -S0, seed the PRNG with the current time in nanoseconds, not
seconds, so consecutive runs don't accidentally use the same seed.

Also, rename some variables for clarity.

Reviewed by: ngie
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20078

fsx: add an option to randomly call msync(MS_INVALIDATE)

This call should be a sufficiently close approximation of what happens
when a filesystem is unmounted and remounted. To be more specific, it
should test that the data that was in the page cache is the same data
that ends up on a stable storage or in a filesystem's internal cache,
if any.
This will catch the cases where a page with modified data is marked as
a clean page for whatever reason.

While there, make logging of the special events (open+close before
plus invalidation now) more generic and slightly better than the previous
hack.

MFC after: 10 days

fsx: new option to disable msync(MS_SYNC) after each write via mmaped region

This option should be useful for testing if a filesystem uses the
unified buffer / page cache.
Or, if filesystem's emulation of the unified cache works as expected.
This should be the case for e.g. ZFS.

MFC after: 1 week

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

getopt(3) returns -1, not EOF.

Fix a obsecure coredump while testing with tmpfs on amd64.

Approved by: re (kensmith)

Fix for architectures where sizeof(void *) > sizeof(int).

After conferring with Apple legal, update the license of this to APSL 2.0
and change the URL link to point to the appropriate license text.

Sync with latest and greatest Apple sources (which, among other things, fix
the style flag).

Submitted by: Conrad Minshall <conrad@apple.com>
Reviewed by: jkh
Obtained from: Apple Computer, Inc.

Add Apple's filesystem exercising tool.

Submitted by: Conrad Minshall <conrad@apple.com>
Obtained from: Apple Computer