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. - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html