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bug#6131: [PATCH]: fiemap support for efficient sparse file copy

From: Pádraig Brady
Subject: bug#6131: [PATCH]: fiemap support for efficient sparse file copy
Date: Fri, 21 May 2010 14:46:57 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100227 Thunderbird/3.0.3

On 21/05/10 13:59, Jim Meyering wrote:
> Pádraig Brady wrote:
>> There is the unlikely combination of ext4 without fiemap support I think?
>> If so then that dependency is worth a comment.
> I don't know off hand.
> Is there a shell-level way to test for that?

One could check if <linux/fiemap.h> is available, but that would add
the dependency on kernel-headers being installed.
Alternatively one could skip the test on non linux and linux < 2.6.27
But requiring ext4 is probably good enough to limit this to systems
that actually do have fiemap available. Adding a comment about linux >= 2.6.27
might help us quickly eliminate false positives that are reported.


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