[PATCH] copy: adjust fiemap handling of sparse files

[Pádraig Brady]

I was looking at adding fallocate() to copy.c,
now that the fiemap code has gone in and
I noticed that if there was allocated space
at the end of a file, not accounted for
in st_size, then any holes would not be detected.
In what other cases does the sparse detection
heuristic fail BTW?

Anwyay, we don't need the heuristic with fiemap,
so I changed accordingly in the attached.

cheers,
Pádraig.

fiemap-sparse.diff
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