Re: [PATCH] fs: support cross-type copy_file_range in overlayfs.

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Whoops, I should have sent a cover letter.

I thought this could speed a lot of operations in docker/podman.

This is my first time patching the kernel, so please be gentle. I
don't really know what I'm doing, but it seems to work. I tested this
manually using qemu; is there an official test suite where I could add
a test?

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