NFSv4: Delegation recalls should not find revoked delegations

If we're processsing a delegation recall, ignore the delegations that
have already been revoked or returned.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/delegation.c

@@ -840,7 +840,7 @@ int nfs_async_inode_return_delegation(struct inode *inode,
 	struct nfs_delegation *delegation;
 
 	rcu_read_lock();
-	delegation = rcu_dereference(NFS_I(inode)->delegation);
+	delegation = nfs4_get_valid_delegation(inode);
 	if (delegation == NULL)
 		goto out_enoent;
 	if (stateid != NULL &&
@@ -866,6 +866,7 @@ nfs_delegation_find_inode_server(struct nfs_server *server,
 	list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
 		spin_lock(&delegation->lock);
 		if (delegation->inode != NULL &&
+		    !test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) &&
 		    nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
 			freeme = igrab(delegation->inode);
 			if (freeme && nfs_sb_active(freeme->i_sb))