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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Subject: bug#23904: closed (Re: bug#23904: Btrfs clone support in copy
 operations)
Date: Sun, 11 Sep 2016 02:17:02 +0000

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Your bug report

#23904: Btrfs clone support in copy operations

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 23904 <at> debbugs.gnu.org.

-- 
23904: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23904
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: sbaugh <at> catern.com, kieran <at> kcolford.com, dmantipov <at> yandex.ru,
 23904-done <at> debbugs.gnu.org
Subject: Re: bug#23904: Btrfs clone support in copy operations
Date: Sat, 10 Sep 2016 19:16:39 -0700

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I looked into this a bit more, and it appears that there's little point to 
giving the user an option to clone or not clone when copying files, as the 
cloning (or not cloning) can occur anyway.

We plan to release a coreutils version soon and to change the default to clone 
after the release. For Emacs master the next release is far away, so there is 
plenty of time to try out the FICLONE performance improvement. I installed the 
attached two patches and am marking this bug report as done.

The second patch merely updates the documentation to discuss the issue; it is 
logically independent of the first patch, since the issue can occur both with 
and without the first patch.

[0001-copy-file-now-uses-GNU-Linux-file-cloning.patch (text/x-diff, attachment)]

[0002-Document-file-synchronization-issues.patch (text/x-diff, attachment)]

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: bug-gnu-emacs <at> gnu.org
Cc: sbaugh <at> catern.com, Kieran Colford <kieran <at> kcolford.com>
Subject: Re: Btrfs clone support in copy operations
Date: Wed, 6 Jul 2016 02:49:12 +0200

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Tags: patch

The attached proposed patch to Emacs master builds on a suggestion by 
Kieran Colford. Kieran, can you please comment on its two FIXMEs?

[0001-copy-file-now-uses-GNU-Linux-file-cloning.patch (text/x-patch, attachment)]

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