This may already be handled?
submit_bh() calls submit_bio() which calls __generic_make_request() and
there we do:
if (unlikely(bio_sectors(bio) > q->max_hw_sectors)) {
printk("bio too big device %s (%u > %u)\n",
bdevname(bio->bi_bdev, b),
bio_sectors(bio),
q->max_hw_sectors);
goto end_io;
}
So if we try to push a too large buffer down with submit_bh() we get a
failure.
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