NFSD: WARN when freeing an item still linked via nf_lru
authorChuck Lever <chuck.lever@oracle.com>
Fri, 8 Jul 2022 18:25:04 +0000 (14:25 -0400)
committerChuck Lever <chuck.lever@oracle.com>
Sat, 30 Jul 2022 00:10:07 +0000 (20:10 -0400)
commit668ed92e651d3c25f9b6e8cb7ceca54d00daa96d
treedcca90f48461852185ce6b0e50b8de40bf88a439
parent2e6c6e4c4375bfd3defa5b1ff3604d9f33d1c936
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>
fs/nfsd/filecache.c