GNU bug report logs - #6131
[PATCH]: fiemap support for efficient sparse file copy

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Message #26 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: Jim Meyering <jim <at> meyering.net>
Cc: Sunil Mushran <sunil.mushran <at> oracle.com>, bug-coreutils <at> gnu.org,
	Joel Becker <Joel.Becker <at> oracle.com>, "jeff.liu" <jeff.liu <at> oracle.com>,
	Chris Mason <chris.mason <at> oracle.com>, Tao Ma <tao.ma <at> oracle.com>
Subject: Re: bug#6131: [PATCH]: fiemap support for efficient sparse file copy
Date: Fri, 21 May 2010 14:46:57 +0100

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.

cheers.
Pádraig.

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