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block: move bio_associate_blkg_from_page to mm/page_io.c

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bio_associate_blkg_from_page is a special purpose helper for swap bios
that doesn't need access to bio internals.  Move it to the swap code
instead of having it in bio.c.

Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2020-06-27 09:31:50 +02:00
committed by Jens Axboe
parent 2badf06cf9
commit a18b9b1590
3 changed files with 17 additions and 33 deletions
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17
mm/page_io.c
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@@ -277,6 +277,23 @@ static inline void count_swpout_vm_event(struct page *page)
count_vm_events(PSWPOUT, hpage_nr_pages(page));
}
#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
static void bio_associate_blkg_from_page(struct bio *bio, struct page *page)
{
struct cgroup_subsys_state *css;
if (!page->mem_cgroup)
return;
rcu_read_lock();
css = cgroup_e_css(page->mem_cgroup->css.cgroup, &io_cgrp_subsys);
bio_associate_blkg_from_css(bio, css);
rcu_read_unlock();
}
#else
#define bio_associate_blkg_from_page(bio, page) do { } while (0)
#endif /* CONFIG_MEMCG && CONFIG_BLK_CGROUP */
int __swap_writepage(struct page *page, struct writeback_control *wbc,
bio_end_io_t end_write_func)
{