NFS: Store the legacy idmapper result in the keyring
This patch removes the old hashmap-based caching and instead uses a "request key actor" to place an upcall to the legacy idmapper rather than going through /sbin/request-key. This will only be used as a fallback if /etc/request-key.conf isn't configured to use nfsidmap. Signed-off-by: NBryan Schumaker <bjschuma@netapp.com> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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