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
* 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
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
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
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
