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Re: [PATCH 1/2] copy-file-range: new module

From: Bruno Haible
Subject: Re: [PATCH 1/2] copy-file-range: new module
Date: Fri, 28 Jun 2019 21:30:24 +0200
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Pádraig Brady wrote:
> https://sourceware.org/ml/libc-alpha/2019-06/msg00873.html

In the NEWS entry, Florian writes:

   Applications which use the
   copy_file_range function will have to be run on kernels which implement
   the copy_file_range system call.

I find this misleading. Coreutils will want to continue to use copy_file_range
whenever the libc provides this function, and at the same time be able to run
on all Linux kernel versions.

Paul's argument convinced me:
> > ... a reliable use of copy_file_ranges will need 
> > to be followed by a read+write loop that handles the special cases where 
> > copy_file_ranges fails. And this read+write loop will work even if 
> > copy_file_range is a stub that always fails. So there's no practical need 
> > to 
> > emulate copy_file_range [in glibc nor gnulib].

Maybe the NEWS entry could be changed to state something similar?


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