gfs2_meta_buffer
ret = gfs2_meta_buffer(ip, GFS2_METATYPE_IN, dblock, &mp->mp_bh[x + 1]);
int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num,
return gfs2_meta_buffer(ip, GFS2_METATYPE_DI, ip->i_no_addr, bhp);