int log2blksz = fs->dev_desc->log2blksz;
int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
int blocksize = (1 << (log2_fs_blocksize + log2blksz));
int log2blksz = fs->dev_desc->log2blksz;
int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
int blocksize = (1 << (log2_fs_blocksize + log2blksz));