gfs2_inode_lookup
inode = gfs2_inode_lookup(dir->i_sb, dtype, addr, formal_ino,
inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,