gfs2_replay_read_block
error = gfs2_replay_read_block(jd, start, &bh_log);
error = gfs2_replay_read_block(jd, start, &bh_log);
error = gfs2_replay_read_block(jd, start, &bh);
error = gfs2_replay_read_block(jd, blk, &bh);
error = gfs2_replay_read_block(jd, start, &bh);
int gfs2_replay_read_block(struct gfs2_jdesc *jd, unsigned int blk,