... this time with a diff attached: 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 read ahead. - 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. Any objections? Btw.: Why do we still need handle_with_strategy()? -- Juergen Hannken-Illjes - hann...@eis.cs.tu-bs.de - TU Braunschweig (Germany)
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