nfs41: implement DESTROY_CLIENTID operation

According to rfc5661 18.50, implement DESTROY_CLIENTID operation.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1527aaffb000..47e94e33a975 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1962,6 +1962,50 @@ out:
         return status;
 }
 
+static inline bool has_resources(struct nfs4_client *clp)
+{
+        return !list_empty(&clp->cl_openowners)
+                || !list_empty(&clp->cl_delegations)
+                || !list_empty(&clp->cl_sessions);
+}
+
+__be32
+nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
+{
+        struct nfs4_client *conf, *unconf, *clp;
+        int status = 0;
+
+        nfs4_lock_state();
+        unconf = find_unconfirmed_client(&dc->clientid);
+        conf = find_confirmed_client(&dc->clientid);
+
+        if (conf) {
+                clp = conf;
+
+                if (!is_client_expired(conf) && has_resources(conf)) {
+                        status = nfserr_clientid_busy;
+                        goto out;
+                }
+
+                /* rfc5661 18.50.3 */
+                if (cstate->session && conf == cstate->session->se_client) {
+                        status = nfserr_clientid_busy;
+                        goto out;
+                }
+        } else if (unconf)
+                clp = unconf;
+        else {
+                status = nfserr_stale_clientid;
+                goto out;
+        }
+
+        expire_client(clp);
+out:
+        nfs4_unlock_state();
+        dprintk("%s return %d\n", __func__, ntohl(status));
+        return status;
+}
+
 __be32
 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
 {