On Mon, 2024-10-21 at 22:23 +0800, Yang Erkun wrote:

Yang Erkun (3):
  nfsd: make sure exp active before svc_export_show
  SUNRPC: make sure cache entry active before cache_show
  nfsd: release svc_expkey/svc_export with rcu_work

 fs/nfsd/export.c   | 36 +++++++++++++++++++++++++++++-------
 fs/nfsd/export.h   |  4 ++--
 net/sunrpc/cache.c |  4 +++-
 3 files changed, 34 insertions(+), 10 deletions(-)

TIL about rcu_work! That seems like a nice clean solution for #3. All 3
patches look fine to me. You can add:

Reviewed-by: Jeff Layton <jlayton@kernel.org>

One thing though. We had very little RCU in nfsd in 2012, so these
problems likely got introduced much later than 2.6.12. cache_get_rcu()
got added in 2018, for instance. We may want a more reasonable Fixes:
tag.