nfsd41: free_session/free_client must be called under the client_lock
The session client is manipulated under the client_lock hence both free_session and nfsd4_del_conns must be called under this lock. This patch adds a BUG_ON that checks this condition in the respective functions and implements the missing locks. nfsd4_{get,put}_session helpers were moved to the C file that uses them so to prevent use from external files and an unlocked version of nfsd4_put_session is provided for external use from nfs4xdr.c Signed-off-by: Benny Halevy <bhalevy@tonian.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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