affs_bread_ino
bh = affs_bread_ino(inode, bidx, create);
bh = affs_bread_ino(inode, bidx, 0);
bh = affs_bread_ino(inode, bidx - 1, 0);
bh = affs_bread_ino(inode, bidx, 0);
bh = affs_bread_ino(inode, bidx - 1, 0);
bh = affs_bread_ino(inode, bidx, 1);
struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);