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| author | Christoph Hellwig <hch@lst.de> | 2020-06-27 09:31:50 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-06-29 09:09:08 -0600 |
| commit | a18b9b1590ca64f877588700de32c9ad236f405c (patch) | |
| tree | e984aa8eff7b32e7fde1412f638107413c722c71 /mm | |
| parent | 2badf06cf906c7af4bdd4bc1da62890c8e686341 (diff) | |
| download | lwn-a18b9b1590ca64f877588700de32c9ad236f405c.tar.gz lwn-a18b9b1590ca64f877588700de32c9ad236f405c.zip | |
block: move bio_associate_blkg_from_page to mm/page_io.c
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_io.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index e8726f3e3820..ccda76790088 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -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) { |