GNU bug report logs - #23904
Btrfs clone support in copy operations

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: sbaugh <at> catern.com, kieran <at> kcolford.com, dmantipov <at> yandex.ru, 23904 <at> debbugs.gnu.org
Subject: bug#23904: Btrfs clone support in copy operations
Date: Wed, 06 Jul 2016 18:26:01 +0300

> Cc: dmantipov <at> yandex.ru, 23904 <at> debbugs.gnu.org, sbaugh <at> catern.com,
>  kieran <at> kcolford.com
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> Date: Wed, 6 Jul 2016 17:08:33 +0200
> 
> No, coreutils cp has an option. As I recall it was put in soon after the 
> btrfs feature was added, and we were worried about bugs in btrfs. This 
> was several years ago.  We're thinking of making cloning the default in 
> cp (on systems that support it) but haven't gotten around to it.

When 'cp' switches to using this by default, will it still have an
option to disable it?  If so, I would think it will be too bold for
Emacs not provide such an option for users, even as opt-out.

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