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useful functions:
	set_blocksize(dev, size);
	brelse(bh);
	bforget(bh);
	bread(dev,block,size);
	breada(dev,block,size,pos,filesize);
	create_buffer(page,size);

-> set_bit(bh_lock,&bh->b_state);

	mark_buffer_dirty(bh,value);
	mark_buffer_uptodate(bh,value);
	mark_buffer_clean(bh,value);