nilfs_bread
error = nilfs_bread(nilfsdev->dat_node, ldatblknr, 0, &bp);
error = nilfs_bread(dir_node, blocknr, 0, &bp);
error = nilfs_bread(dir_node, blocknr, 0, &bp);
error = nilfs_bread(dir_node, blocknr, 0, &bp);
int nilfs_bread(struct nilfs_node *node, uint64_t blocknr,
error = nilfs_bread(ump->ifile_node, ivblocknr, 0, &bp);
error = nilfs_bread(cp_node, 0, 0, &bp);
error = nilfs_bread(cp_node, blocknr, 0, &bp);
error = nilfs_bread(node, blocknr, 0, &bp);
error = nilfs_bread(node, blocknr, 0, &bp);