[Q] BIO for O_DIRECT

[Thunder from the hill]

Hi,

In fs/direct_io.c, we have this construct:

                  ret = dio_bio_alloc(dio, map_bh.b_bdev,
                        map_bh.b_blocknr << (blkbits - 9),
                        DIO_BIO_MAX_SIZE / PAGE_SIZE);

Problem is that BIO_MAX_SIZE isn't static any more with the BIO patch. 
BIO_MAX_SIZE / PAGE_SIZE looks like the maximal number of iovecs, which is 
dynamic now and can be determined using

bio_max_iovecs(request_queue_t *q, int *iovec_size)

My problem here is that I don't know where to get the parameters from...

							Regards,
							Thunder
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