Curious about corner case in btrfs code

[Nick]

After reading through the code in inode.c today , I am curious about the comment and the following code I will paste
below. I am curious if this corner case is hit often enough for me to write a patch to improve the speed of this 
corner case. Furthermore , compress_file_range is the function name, in case you can't guess by the pasted code.
Regards Nick
411 	/*
412 	 * we don't want to send crud past the end of i_size through
413 	 * compression, that's just a waste of CPU time.  So, if the
414 	 * end of the file is before the start of our current
415 	 * requested range of bytes, we bail out to the uncompressed
416 	 * cleanup code that can deal with all of this.
417 	 *
418 	 * It isn't really the fastest way to fix things, but this is a
419 	 * very uncommon corner.
420 	 */
421 	if (actual_end <= start)
422 		goto cleanup_and_bail_uncompressed;