+ return nfs_do_return_delegation(inode, delegation);
+}
+
+static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid)
+{
+ struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation);
+
+ if (delegation == NULL)
+ goto nomatch;
+ if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data,
+ sizeof(delegation->stateid.data)) != 0)
+ goto nomatch;
+ list_del_rcu(&delegation->super_list);
+ nfsi->delegation_state = 0;
+ rcu_assign_pointer(nfsi->delegation, NULL);
+ return delegation;
+nomatch:
+ return NULL;
+}
+
+int nfs_inode_return_delegation(struct inode *inode)
+{
+ struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs_delegation *delegation;
+ int err = 0;
+
+ if (rcu_dereference(nfsi->delegation) != NULL) {
+ spin_lock(&clp->cl_lock);
+ delegation = nfs_detach_delegation_locked(nfsi, NULL);
+ spin_unlock(&clp->cl_lock);
+ if (delegation != NULL)
+ err = __nfs_inode_return_delegation(inode, delegation);
+ }
+ return err;