static unsigned int calc_reserved(struct gfs2_sbd *sdp)
 {
        unsigned int reserved = 0;
-       unsigned int mbuf;
-       unsigned int dbuf;
+       unsigned int blocks;
        struct gfs2_trans *tr = sdp->sd_log_tr;
 
        if (tr) {
-               mbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
-               dbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
-               reserved = mbuf + dbuf;
-               /* Account for header blocks */
-               reserved += DIV_ROUND_UP(mbuf, buf_limit(sdp));
-               reserved += DIV_ROUND_UP(dbuf, databuf_limit(sdp));
+               blocks = tr->tr_num_buf_new - tr->tr_num_buf_rm;
+               reserved += blocks + DIV_ROUND_UP(blocks, buf_limit(sdp));
+               blocks = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
+               reserved += blocks + DIV_ROUND_UP(blocks, databuf_limit(sdp));
        }
 
        if (sdp->sd_log_committed_revoke > 0)