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

[Jens Axboe <jens.axboe@oracle.com>]

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

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