Only POSIX ACLs supported over NFS

NFS server only supports posix acls, i.e, system.posix_acl_access and system.posix_acl_default. Other extended attributes are not supported through NFS server. There is strict checking in NFS that only these 2 ACLs can be set/get.

2220 int    
2221 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
2222 {      
2223         struct inode *inode = fhp->fh_dentry->d_inode;
2224         char *name;
2225         void *value = NULL;
2226         size_t size;
2227         int error;
2228        
2229         if (!IS_POSIXACL(inode) ||
2230             !inode->i_op->setxattr || !inode->i_op->removexattr)
2231                 return -EOPNOTSUPP;
2232         switch(type) {
2233                 case ACL_TYPE_ACCESS:
2234                         name = POSIX_ACL_XATTR_ACCESS;
2235                         break;
2236                 case ACL_TYPE_DEFAULT:
2237                         name = POSIX_ACL_XATTR_DEFAULT;
2238                         break;
2239                 default:
2240                         return -EOPNOTSUPP;
2241         } 
2242