[PATCH v10 17/33] mm/memcg: Add folio wrappers for various functions

[Matthew Wilcox (Oracle)]

Add new wrapper functions folio_memcg(), lock_folio_memcg(),
unlock_folio_memcg(), mem_cgroup_folio_lruvec() and
count_memcg_folio_event()

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
 include/linux/memcontrol.h | 63 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index c193be760709..a3e627ea98e0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -456,6 +456,11 @@ static inline struct mem_cgroup *page_memcg(struct page *page)
 		return __page_memcg(page);
 }
 
+static inline struct mem_cgroup *folio_memcg(struct folio *folio)
+{
+	return page_memcg(&folio->page);
+}
+
 /*
  * page_memcg_rcu - locklessly get the memory cgroup associated with a page
  * @page: a pointer to the page struct
@@ -1058,6 +1063,15 @@ static inline void count_memcg_page_event(struct page *page,
 		count_memcg_events(memcg, idx, 1);
 }
 
+static inline void count_memcg_folio_event(struct folio *folio,
+					  enum vm_event_item idx)
+{
+	struct mem_cgroup *memcg = folio_memcg(folio);
+
+	if (memcg)
+		count_memcg_events(memcg, idx, folio_nr_pages(folio));
+}
+
 static inline void count_memcg_event_mm(struct mm_struct *mm,
 					enum vm_event_item idx)
 {
@@ -1129,6 +1143,11 @@ static inline struct mem_cgroup *page_memcg(struct page *page)
 	return NULL;
 }
 
+static inline struct mem_cgroup *folio_memcg(struct folio *folio)
+{
+	return NULL;
+}
+
 static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
 {
 	WARN_ON_ONCE(!rcu_read_lock_held());
@@ -1477,6 +1496,22 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 }
 #endif /* CONFIG_MEMCG */
 
+static inline void lock_folio_memcg(struct folio *folio)
+{
+	lock_page_memcg(&folio->page);
+}
+
+static inline void unlock_folio_memcg(struct folio *folio)
+{
+	unlock_page_memcg(&folio->page);
+}
+
+static inline struct lruvec *mem_cgroup_folio_lruvec(struct folio *folio,
+						    struct pglist_data *pgdat)
+{
+	return mem_cgroup_page_lruvec(&folio->page, pgdat);
+}
+
 static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
 {
 	__mod_lruvec_kmem_state(p, idx, 1);
@@ -1544,6 +1579,34 @@ static inline struct lruvec *relock_page_lruvec_irqsave(struct page *page,
 	return lock_page_lruvec_irqsave(page, flags);
 }
 
+static inline struct lruvec *folio_lock_lruvec(struct folio *folio)
+{
+	return lock_page_lruvec(&folio->page);
+}
+
+static inline struct lruvec *folio_lock_lruvec_irq(struct folio *folio)
+{
+	return lock_page_lruvec_irq(&folio->page);
+}
+
+static inline struct lruvec *folio_lock_lruvec_irqsave(struct folio *folio,
+		unsigned long *flagsp)
+{
+	return lock_page_lruvec_irqsave(&folio->page, flagsp);
+}
+
+static inline struct lruvec *folio_relock_lruvec_irq(struct folio *folio,
+		struct lruvec *locked_lruvec)
+{
+	return relock_page_lruvec_irq(&folio->page, locked_lruvec);
+}
+
+static inline struct lruvec *folio_relock_lruvec_irqsave(struct folio *folio,
+		struct lruvec *locked_lruvec, unsigned long *flagsp)
+{
+	return relock_page_lruvec_irqsave(&folio->page, locked_lruvec, flagsp);
+}
+
 #ifdef CONFIG_CGROUP_WRITEBACK
 
 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
-- 
2.30.2