Re: [PATCH 2/9] block: update chunk_sectors in blk_stack_limits()

[Bart Van Assche <bart.vanassche@xxxxxxxxxxx>]

On 04/04/16 03:00, Hannes Reinecke wrote:
> diff --git a/block/blk-settings.c b/block/blk-settings.c
> index c7bb666..29fa900 100644
> --- a/block/blk-settings.c
> +++ b/block/blk-settings.c
> @@ -630,6 +630,9 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
>   			t->discard_granularity;
>   	}
>
> +	if (b->chunk_sectors)
> +		t->chunk_sectors = max(t->chunk_sectors, b->chunk_sectors);
> +
>   	return ret;
>   }
>   EXPORT_SYMBOL(blk_stack_limits);

Hello Hannes,

My understanding is that a non-zero chunk_sectors value defines a 
maximum I/O size. Shouldn't max() be changed into min_not_zero()? From 
include/linux/blkdev.h:

static inline unsigned int blk_max_size_offset(struct request_queue *q,
					       sector_t offset)
{
	if (!q->limits.chunk_sectors)
		return q->limits.max_sectors;

	return q->limits.chunk_sectors -
			(offset & (q->limits.chunk_sectors - 1));
}

Bart.

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