GNU bug report logs - #48164
cp --reflink=never no longer works as expected

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Package: coreutils;

Reported by: Chris Murphy <lists <at> colorremedies.com>

Date: Sun, 2 May 2021 17:13:01 UTC

Severity: normal

Done: Pádraig Brady <P <at> draigBrady.com>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Chris Murphy <lists <at> colorremedies.com>
To: bug-coreutils <at> gnu.org
Subject: cp --reflink=never no longer works as expected
Date: Sun, 2 May 2021 11:12:27 -0600

Hi,

Fedora 34 user 'adrum' reports that 'cp --reflink=never' is performing
a lightweight copy on Btrfs. And filefrag -v shows the extents are
shared. Strace shows use of copy_file_range even with --reflink=never

The note for copy_file_range() includes:

copy_file_range() gives filesystems an opportunity to implement
       "copy acceleration" techniques, such as the use of reflinks


Downstream bug
https://bugzilla.redhat.com/show_bug.cgi?id=1956080

The commit that causes the change in behavior:
https://src.fedoraproject.org/rpms/coreutils/c/1737e5c81fa82451b510f982499bdedb2a1619d1?branch=rawhide

It references five upstream commits.


-- 
Chris Murphy
This bug report was last modified 4 years and 16 days ago.

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