Re: [RFC v1 01/19] fs: Don't copy beyond the end of the file

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On Fri, Mar 03, 2017 at 03:47:47PM -0500, J. Bruce Fields wrote:
> That's what I think too, but then is COPY(2) wrong?:

Either the current kernel code or the man page is wrong..

> Also, copy_file_range can be implemented by ->clone_file_range, where
> these kinds of checks make more sense, I think; e.g. from btrfs:
> 
> 	ret = -EINVAL;
> 	if (off + len > src->i_size || off + len < off)
> 		goto out_unlock;
> 
> Well, so the caller just has to be prepared for either behavior, I
> guess, but that may make it more complicated to use.

We'll need to stick to one behavior.  So between the man page and
the clone implementation I guess this patch is fine after all.
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