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Re: extending cp to use copy_file_range system call

From: Jeff Layton
Subject: Re: extending cp to use copy_file_range system call
Date: Fri, 07 Jun 2019 08:34:05 -0400
User-agent: Evolution 3.32.2 (3.32.2-1.fc30)

On Thu, 2019-06-06 at 16:12 -0400, Olga Kornievskaia wrote:
> Hi folks,
> In the spirit of my inquiries about cp functionality, I'd like to ask
> the community if there are any plans to make use of the
> copy_file_range() system call that's been available in the linux
> kernel for a number of years now. While it promises great improvement
> to the network file systems that support copy offload functionality,
> it also promises to benefit local file systems as well as it saves
> copying into the use-provided buffers during read/write operations and
> all is done in the kernel.
> Are there any barriers to say having an option to the cp command to
> use copy_file_range() instead of going a traditional route, would
> there be objections to something like that?
> Thank you.
> (again please cc me on the replies as I'm not on the mailing list).


Just add new --offload / --no-offload options and wire up accordingly.

We could start with --no-offload being the default and flip that later,
once we feel that it's safe enough.
Jeff Layton <address@hidden>

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