Re: [11/36] Use page_cache_xxx in fs/buffer.c

Jens Axboe
2007-08-31T06:57:09Z

On Thu, Aug 30 2007, Christoph Lameter wrote:
> 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.

Only partly, you may be violating a number of other restrictions (size
is many things, not just length of the data).

--
Jens Axboe