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How to disable this test on filesystems (like NFS) where duperemove >> is not supported or where the test is not meaningful. The current check >> for the presence of the duperemove executable is IMO inadequate. > > I've not looked at dupremove, but the name suggested it's de-duplicating > and thus needs a working FIDEDUPERANGE ioctl. So the test should check > for that using the _require_test_dedupe / _require_scratch_dedupe > helpers. generic/{559,560,561} do that, so something either in these > helpers is probably broken given that NFS rejects remap_file_range > with REMAP_FILE_DEDUP, although a bit of tracing would be useful if > there actually is something broken in NFS or the VFS. It doesn't appear to be an NFS problem; duperemove is not even issuing the ioctl as a toe-test to see if it will work. I opened https://github.com/markfasheh/duperemove/issues/363 -- Chuck Lever