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bug#56391: `cp --reflink=always` creates empty file on failure


From: Paul Eggert
Subject: bug#56391: `cp --reflink=always` creates empty file on failure
Date: Wed, 6 Jul 2022 14:48:33 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1

On 7/6/22 06:17, Pádraig Brady wrote:
This will usually work, but there are cases where this may lose data,
as previously discussed at:

https://bugzilla.redhat.com/show_bug.cgi?id=921708
http://lists.gnu.org/archive/html/coreutils/2013-03/msg00056.html

I'm not sure cp can robustly clean up in this situation?

Thanks for pointing me to those old discussions. As I understand it, the worry is that FICLONE will only partly succeed, causing the destination file to contain some (but not all) the input data, and then if we remove the output file we'll lose the newly-made partial clone. I don't know whether FICLONE can do that, but it sounds like a reasonable worry.

If that understanding is correct, then the attached further patch should suffice, so I boldly installed it.

Attachment: 0001-cp-don-t-remove-nonempty-cloned-dest.patch
Description: Text Data


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