GNU bug report logs - #79139
cp --reflink truncates sparse files on ZFS

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Message #28 received at 79139-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Collin Funk <collin.funk1 <at> gmail.com>
Cc: 79139-done <at> debbugs.gnu.org,
 Pádraig Brady <P <at> draigBrady.com>,
 Leah Neukirchen <leah <at> vuxu.org>
Subject: Re: bug#79139: cp --reflink truncates sparse files on ZFS
Date: Fri, 1 Aug 2025 17:17:16 -0700

[Message part 1 (text/plain, inline)]

On 2025-08-01 15:05, Collin Funk wrote:
> I was hoping that file could be made a tiny stub, due to the
> workarounds for Linux 4.19 being mostly unnecessary now that it is EOL.
> But now we have a new problem to deal with. :)

That we do. But we can more thorougly stubify the old Linux kernel bug 
workaround while we're in the neighborhood. Probably best not to remove 
it entirely as RHEL 8 still uses the no-longer-supported kernel.

To do that, I installed the attached patches into Gnulib and propagated 
them into coreutils.

Boldly closing the bug report. Thanks, Leah, for reporting it. That one 
was quite a whopper.

[0001-copy-file-range-tune-for-more-modern-kernels.patch (text/x-patch, attachment)]

[0002-copy-file-range-work-around-glibc-bug-33245.patch (text/x-patch, attachment)]

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