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authorChristoph Hellwig <hch@lst.de>2020-06-27 10:31:50 +0300
committerJens Axboe <axboe@kernel.dk>2020-06-29 18:09:08 +0300
commita18b9b1590ca64f877588700de32c9ad236f405c (patch)
treee984aa8eff7b32e7fde1412f638107413c722c71
parent2badf06cf906c7af4bdd4bc1da62890c8e686341 (diff)
downloadlinux-a18b9b1590ca64f877588700de32c9ad236f405c.tar.xz
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>
-rw-r--r--block/bio.c26
-rw-r--r--include/linux/bio.h7
-rw-r--r--mm/page_io.c17
3 files changed, 17 insertions, 33 deletions
diff --git a/block/bio.c b/block/bio.c
index bc8de2432e36..901d22715dd4 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1659,32 +1659,6 @@ void bio_associate_blkg_from_css(struct bio *bio,
}
EXPORT_SYMBOL_GPL(bio_associate_blkg_from_css);
-#ifdef CONFIG_MEMCG
-/**
- * bio_associate_blkg_from_page - associate a bio with the page's blkg
- * @bio: target bio
- * @page: the page to lookup the blkcg from
- *
- * Associate @bio with the blkg from @page's owning memcg and the respective
- * request_queue. If cgroup_e_css returns %NULL, fall back to the queue's
- * root_blkg.
- */
-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();
-}
-#endif /* CONFIG_MEMCG */
-
/**
* bio_associate_blkg - associate a bio with a blkg
* @bio: target bio
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4cd229e175c0..c6d765382926 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -489,13 +489,6 @@ do { \
#define bio_dev(bio) \
disk_devt((bio)->bi_disk)
-#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
-void bio_associate_blkg_from_page(struct bio *bio, struct page *page);
-#else
-static inline void bio_associate_blkg_from_page(struct bio *bio,
- struct page *page) { }
-#endif
-
#ifdef CONFIG_BLK_CGROUP
void bio_associate_blkg(struct bio *bio);
void bio_associate_blkg_from_css(struct bio *bio,
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)
{