[Bug 8918] Use fiemap to quickly detect zero ranges of source file

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=8918

--- Comment #1 from Arne Jansen <jansen at webgods.de> 2012-05-08 05:59:34 UTC ---
you could also use the SEEK_HOLE/SEEK_DATA interface which linux added
recently.
This would have the advantage of being Solaris-compatible.

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