GNU bug report logs - #55724
cp --reflink=always failing when --reflink=auto reflinks successfully on OpenZFS

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Pádraig Brady <P <at> draigBrady.com>
Cc: 55724 <at> debbugs.gnu.org, Rich <rincebrain <at> gmail.com>
Subject: bug#55724: cp --reflink=always failing when --reflink=auto reflinks successfully on OpenZFS
Date: Mon, 30 May 2022 16:31:40 -0700

On 5/30/22 08:04, Pádraig Brady wrote:
> Really the kernel has to behave appropriately there
> and not do the blanket assumption with EXDEV.

I agree. VFS should be willing to try a cross-filesystem FICLONE. Not 
only does copy_file_range not guarantee cloning; it is less efficient 
even when it does clone, due to the need to find the holes in the source 
file.

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