Possible error in fs/buffer.c

["Robert W. Maloy" <r.w.maloy@acm.org>]

	While code surfing I found what appears to be a problem with the 
following code in fs/buffer.c {function mark_buffer_inode_dirty}: 

       if (list_empty(&bh->b_assoc_buffers))
                buffer_insert_list(&buffer_mapping->private_lock,
                                bh, &mapping->private_list);

	From my research, the job of buffer_insert_list is to place the list 
contents of bh->b_assoc_buffers onto the list mapping->private list. 
The above code segment will only call buffer_insert_list if 
b_assoc_buffers is empty. Why waste the time, and resources 
attempting to add an empty list to the end of private_list?

	If this is a problem, then there are two possibilities for fixing 
this code: 

    1) This was just a mistake
	add "!" in the if, this only adds the list if there is 
        something to add.
		- if (list_empty(&bh->b_assoc_buffers))
		+ if (!list_empty(&bh->b_assoc_buffers))

    2) Some of the assoc buffers may already be on the private_list. 
If this is a possibility then this routine will need more work.
	


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-- 
Cheers
Rob Maloy
r.w.maloy@acm.org
(410) 854-6637