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Make vnd(4) work on sparse files
With the attached diff vnd(4) devices will work on sparse files.
- Make the strategy decision a device flag and set to VNF_USE_VN_RDWR for
files known to be sparse.
- Change handle_with_rdwr() to use POSIX_FADV_NOREUSE advise to disable
- Keep the amount of mapped pages below 1 MByte.
Manuel Bouyer was so kind to test a NetBSD install with a PV domU backed
by a sparse file and it worked without problems.
Btw.: Why do we still need handle_with_strategy()?
Juergen Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig
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