Re: [dm-devel] [PATCH] rm alloc_page from dm-emc take 2

[Mike Christie <mikenc us ibm com>]

Mike Christie wrote:
> I am not sure if the first mail got sent out. Here is
> the correct mail with the patch.
>
> Hey Lars,
>
> Here is what I meant. A Page for just something around 8-16 bytes
> seems wasteful. Plus there is no reserve.
>
> If you have to end up setting more bits maybe it is better to
> preallocate a command per device at create time, or maybe since
> there are four different combos I should have done it with this
> patch?
>
> This was made against 2.6.12-rc2. Only compile tested.
>
> Mike




> +	if (bio_add_page(bio, virt_to_page(data), data_size,
> +			 offset_in_page(data)) != data_size) {

My concern though is that I do no think I can do this. I mean we cannot 
start the IO from the middle of a page.