+/**
+ * Check if the sequence server has sequence avaible
+ *
+ * Check if the sequence server has sequence avaible, if not, then
+ * allocating super sequence from sequence manager (MDT0).
+ *
+ * \param[in] env execution environment
+ * \param[in] seq server sequence
+ *
+ * \retval negative errno if allocating new sequence fails
+ * \retval 0 if there is enough sequence or allocating
+ * new sequence succeeds
+ */
+int seq_server_check_and_alloc_super(const struct lu_env *env,
+ struct lu_server_seq *seq)
+{
+ struct lu_seq_range *space = &seq->lss_space;
+ int rc = 0;
+
+ ENTRY;
+
+ /* Check if available space ends and allocate new super seq */
+ if (lu_seq_range_is_exhausted(space)) {
+ if (!seq->lss_cli) {
+ CERROR("%s: No sequence controller is attached.\n",
+ seq->lss_name);
+ RETURN(-ENODEV);
+ }
+
+ rc = seq_client_alloc_super(seq->lss_cli, env);
+ if (rc) {
+ CDEBUG(D_HA, "%s: Can't allocate super-sequence:"
+ " rc %d\n", seq->lss_name, rc);
+ RETURN(rc);
+ }
+
+ /* Saving new range to allocation space. */
+ *space = seq->lss_cli->lcs_space;
+ LASSERT(lu_seq_range_is_sane(space));
+ if (seq->lss_cli->lcs_srv == NULL) {
+ struct lu_server_fld *fld;
+
+ /* Insert it to the local FLDB */
+ fld = seq->lss_site->ss_server_fld;
+ mutex_lock(&fld->lsf_lock);
+ rc = fld_insert_entry(env, fld, space);
+ mutex_unlock(&fld->lsf_lock);
+ }
+ }
+
+ if (lu_seq_range_is_zero(&seq->lss_lowater_set))
+ __seq_set_init(env, seq);
+
+ RETURN(rc);