affs_alloc_block
extern u32 affs_alloc_block(struct inode *inode, u32 goal);
blocknr = affs_alloc_block(inode, bh->b_blocknr);
u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
if (!(block = affs_alloc_block(dir, dir->i_ino)))
block = affs_alloc_block(dir, dir->i_ino);