generic/430 COPY/delegation caching regression

J. Bruce Fields
2021-04-13T23:20:00Z

generic/430 started failing in 4.12-rc3, as of 7c1d1dcc24b3 "nfsd: grant
read delegations to clients holding writes".

Looks like that reintroduced the problem fixed by 16abd2a0c124 "NFSv4.2:
fix client's attribute cache management for copy_file_range": the client
needs to invalidate its cache of the destination of a copy even when it
holds a delegation.

--b.