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Subject[Q] BIO for O_DIRECT
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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