return -EOPNOTSUPP;
struct inode *inode = dentry->d_inode;  if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) return -EOPNOTSUPP;  if (!S_ISREG(inode->i_mode) && (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) return -EPERM;  return nfs4_proc_set_acl(inode, buf, buflen);
int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,		size_t buflen, int flags){	return -EOPNOTSUPP;}