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bug#55724: cp --reflink=always failing when --reflink=auto reflinks succ

From: Paul Eggert
Subject: bug#55724: cp --reflink=always failing when --reflink=auto reflinks successfully on OpenZFS
Date: Mon, 30 May 2022 16:31:40 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1

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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