[PATCHv3 3/6] mm: break up swap_writepage() for frontswap backends

[Minchan Kim]

On Mon, Jan 28, 2013 at 03:49:24PM -0600, Seth Jennings wrote:
> swap_writepage() is currently where frontswap hooks into the swap
> write path to capture pages with the frontswap_store() function.
> However, if a frontswap backend wants to "resume" the writeback of
> a page to the swap device, it can't call swap_writepage() as
> the page will simply reenter the backend.
> 
> This patch separates swap_writepage() into a top and bottom half, the
> bottom half named __swap_writepage() to allow a frontswap backend,
> like zswap, to resume writeback beyond the frontswap_store() hook.
> 
> __add_to_swap_cache() is also made non-static so that the page for
> which writeback is to be resumed can be added to the swap cache.
> 
> Signed-off-by: Seth Jennings <sjenning at linux.vnet.ibm.com>
Acked-by: Minchan Kim <minchan at kernel.org>

-- 
Kind regards,
Minchan Kim