Mark Johnston 46b2623586 Allow disabling of unmapped I/O on FreeBSD ... We have a tunable which permits one to disable the use of unmapped I/O for the buffer cache. Respect it in ZFS as well. This is useful for KMSAN, which cannot easily maintain shadow state for unmapped pages. No functional change intended, as unmapped I/O is permitted by default and there's no real reason to disable it in practice except for debugging. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Mark Johnston <markj@FreeBSD.org> Closes #12446		2021-08-02 13:18:24 -06:00
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freebsd	Allow disabling of unmapped I/O on FreeBSD	2021-08-02 13:18:24 -06:00
linux	Avoid small buffer copying on write	2021-07-27 16:05:47 -07:00