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bug#48164: cp --reflink=never no longer works as expected

From: Chris Murphy
Subject: bug#48164: cp --reflink=never no longer works as expected
Date: Sun, 2 May 2021 11:12:27 -0600


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

The commit that causes the change in behavior:

It references five upstream commits.

Chris Murphy

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