On Fri, 20 Apr 2007, Jens Axboe wrote:
> This works fine as long as you are in the submitter context, but once
> you pass the into the block layer, we don't have any way to find the
> address space (at least we don't want to). Would something like this be
> workable, name withstanding:
>
> static unsigned long page_size(struct page *page)
> {
> struct address_space *mapping;
> int order = 0;
>
> mapping = page_mapping(page);
> if (mapping)
> order = mapping->order;
>
> return PAGE_CACHE_SIZE << order;
> }
There is much simpler solution (possible with mm)
PAGE_SIZE << compound_order(page)
compound_order will return 0 for a non compound page.
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