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H A Dfilecache.cdiff 668ed92e651d3c25f9b6e8cb7ceca54d00daa96d Fri Jul 08 13:25:04 CDT 2022 Chuck Lever <chuck.lever@oracle.com> NFSD: WARN when freeing an item still linked via nf_lru

Add a guardrail to prevent freeing memory that is still on a list.
This includes either a dispose list or the LRU list.

This is the sign of a bug, but this class of bugs can be detected
so that they don't endanger system stability, especially while
debugging.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>