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>

4 files changed, 61 insertions, 2 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 458ebb6b59c..fa383361bc6 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1645,7 +1645,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
                 .op_name = "OP_SEQUENCE",
         },
         [OP_DESTROY_CLIENTID] = {
-                .op_func = NULL,
+                .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
                                 | OP_MODIFIES_SOMETHING,
                 .op_name = "OP_DESTROY_CLIENTID",
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1527aaffb00..47e94e33a97 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)
 {
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index decea140b32..66d095d7955 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1417,6 +1417,16 @@ xdr_error:
         goto out;
 }
 
+static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
+{
+        DECODE_HEAD;
+
+        READ_BUF(8);
+        COPYMEM(&dc->clientid, 8);
+
+        DECODE_TAIL;
+}
+
 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
 {
         DECODE_HEAD;
@@ -1538,7 +1548,7 @@ static nfsd4_dec nfsd41_dec_ops[] = {
         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
+        [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
 };
 
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index e3057350eea..2364747ee97 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -398,6 +398,10 @@ struct nfsd4_destroy_session {
         struct nfs4_sessionid   sessionid;
 };
 
+struct nfsd4_destroy_clientid {
+        clientid_t clientid;
+};
+
 struct nfsd4_reclaim_complete {
         u32 rca_one_fs;
 };
@@ -552,6 +556,7 @@ extern __be32 nfsd4_sequence(struct svc_rqst *,
 extern __be32 nfsd4_destroy_session(struct svc_rqst *,
                 struct nfsd4_compound_state *,
                 struct nfsd4_destroy_session *);
+extern __be32 nfsd4_destroy_clientid(struct svc_rqst *, struct nfsd4_compound_state *, struct nfsd4_destroy_clientid *);
 __be32 nfsd4_reclaim_complete(struct svc_rqst *, struct nfsd4_compound_state *, struct nfsd4_reclaim_complete *);
 extern __be32 nfsd4_process_open1(struct nfsd4_compound_state *,
                 struct nfsd4_open *open);