[rrd-developers] bus error when disk is full, with mmap & sparse file

[Richard Laager]

The posix_fallocate() version is definitely cleaner. Again, this patch
is only lightly tested.

Also, I happened to notice a tiny bit of duplicated code, so I've
attached a separate patch for that. It seems so obviously duplicated
that I've looked at it several times to make sure I'm not missing
something.

-- 
Richard
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