nilfs_ifile_get_inode_block
int nilfs_ifile_get_inode_block(struct inode *, ino_t, struct buffer_head **);
err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
err = nilfs_ifile_get_inode_block(