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

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From: Paul Eggert <eggert <at> CS.UCLA.EDU>
To: Sunil Mushran <sunil.mushran <at> oracle.com>
Cc: bug-coreutils <at> gnu.org, Jim Meyering <jim <at> meyering.net>, Joel Becker <Joel.Becker <at> oracle.com>, "jeff.liu" <jeff.liu <at> oracle.com>, Tao Ma <tao.ma <at> oracle.com>, "linux-ext4 <at> vger.kernel.org" <linux-ext4 <at> vger.kernel.org>, Chris Mason <chris.mason <at> oracle.com>
Subject: bug#6131: [PATCH]: fiemap support for efficient sparse file copy
Date: Tue, 15 Jun 2010 14:11:01 -0700

Sunil Mushran wrote:

> SEEK_HOLE/DATA also have the same problem with active files.

Yes, that's true if 'cp' is copying a file while someone else is writing to it.
But the case we're worried about is when 'cp' starts copying a file immediately
after someone else has finished writing to it but data has not been sent to
disk; in that case SEEK_HOLE/DATA should work just as well as the fiemap ioctl.

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