[PATCH v2 43/46] mm/filemap: Add filemap_add_folio

[Matthew Wilcox (Oracle)]

Pages being added to the page cache should already be folios, so
just cast the page to a folio in the add_to_page_cache_lru() wrapper.
Saves 96 bytes of text.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/mm.h      |  7 -----
 include/linux/pagemap.h | 16 ++++++++--
 kernel/bpf/verifier.c   |  2 +-
 mm/filemap.c            | 69 ++++++++++++++++++++---------------------
 4 files changed, 47 insertions(+), 47 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d25ff74cf9e1..4ad03f4a9376 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -223,13 +223,6 @@ int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *,
 		loff_t *);
 int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *,
 		loff_t *);
-/*
- * Any attempt to mark this function as static leads to build failure
- * when CONFIG_DEBUG_INFO_BTF is enabled because __add_to_page_cache_locked()
- * is referred to by BPF code. This must be visible for error injection.
- */
-int __add_to_page_cache_locked(struct page *page, struct address_space *mapping,
-		pgoff_t index, gfp_t gfp, void **shadowp);
 
 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 7637cc9333c9..b0c1d24fb01b 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -876,9 +876,9 @@ static inline int fault_in_pages_readable(const char __user *uaddr, int size)
 }
 
 int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
-				pgoff_t index, gfp_t gfp_mask);
-int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
-				pgoff_t index, gfp_t gfp_mask);
+				pgoff_t index, gfp_t gfp);
+int filemap_add_folio(struct address_space *mapping, struct folio *folio,
+				pgoff_t index, gfp_t gfp);
 extern void delete_from_page_cache(struct page *page);
 extern void __delete_from_page_cache(struct page *page, void *shadow);
 void replace_page_cache_page(struct page *old, struct page *new);
@@ -903,6 +903,16 @@ static inline int add_to_page_cache(struct page *page,
 	return error;
 }
 
+static inline int add_to_page_cache_lru(struct page *page,
+		struct address_space *mapping, pgoff_t index, gfp_t gfp)
+{
+	return filemap_add_folio(mapping, (struct folio *)page, index, gfp);
+}
+
+/* Must be non-static for BPF error injection */
+int __filemap_add_folio(struct address_space *mapping, struct folio *folio,
+		pgoff_t index, gfp_t gfp, void **shadowp);
+
 /**
  * struct readahead_control - Describes a readahead request.
  *
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 94ba5163d4c5..cab4d64c1809 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -12962,7 +12962,7 @@ BTF_SET_START(btf_non_sleepable_error_inject)
 /* Three functions below can be called from sleepable and non-sleepable context.
  * Assume non-sleepable from bpf safety point of view.
  */
-BTF_ID(func, __add_to_page_cache_locked)
+BTF_ID(func, __filemap_add_folio)
 BTF_ID(func, should_fail_alloc_page)
 BTF_ID(func, should_failslab)
 BTF_SET_END(btf_non_sleepable_error_inject)
diff --git a/mm/filemap.c b/mm/filemap.c
index 4debb11ecc3e..a174f8ce87ea 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -855,26 +855,24 @@ void replace_page_cache_page(struct page *old, struct page *new)
 }
 EXPORT_SYMBOL_GPL(replace_page_cache_page);
 
-noinline int __add_to_page_cache_locked(struct page *page,
-					struct address_space *mapping,
-					pgoff_t offset, gfp_t gfp,
-					void **shadowp)
+noinline int __filemap_add_folio(struct address_space *mapping,
+		struct folio *folio, pgoff_t index, gfp_t gfp, void **shadowp)
 {
-	XA_STATE(xas, &mapping->i_pages, offset);
-	int huge = PageHuge(page);
+	XA_STATE(xas, &mapping->i_pages, index);
+	int huge = folio_hugetlb(folio);
 	int error;
 	bool charged = false;
 
-	VM_BUG_ON_PAGE(!PageLocked(page), page);
-	VM_BUG_ON_PAGE(PageSwapBacked(page), page);
+	VM_BUG_ON_FOLIO(!folio_locked(folio), folio);
+	VM_BUG_ON_FOLIO(folio_swapbacked(folio), folio);
 	mapping_set_update(&xas, mapping);
 
-	get_page(page);
-	page->mapping = mapping;
-	page->index = offset;
+	folio_get(folio);
+	folio->mapping = mapping;
+	folio->index = index;
 
 	if (!huge) {
-		error = mem_cgroup_charge(page, current->mm, gfp);
+		error = folio_charge_cgroup(folio, current->mm, gfp);
 		if (error)
 			goto error;
 		charged = true;
@@ -886,7 +884,7 @@ noinline int __add_to_page_cache_locked(struct page *page,
 		unsigned int order = xa_get_order(xas.xa, xas.xa_index);
 		void *entry, *old = NULL;
 
-		if (order > thp_order(page))
+		if (order > folio_order(folio))
 			xas_split_alloc(&xas, xa_load(xas.xa, xas.xa_index),
 					order, gfp);
 		xas_lock_irq(&xas);
@@ -903,13 +901,13 @@ noinline int __add_to_page_cache_locked(struct page *page,
 				*shadowp = old;
 			/* entry may have been split before we acquired lock */
 			order = xa_get_order(xas.xa, xas.xa_index);
-			if (order > thp_order(page)) {
+			if (order > folio_order(folio)) {
 				xas_split(&xas, old, order);
 				xas_reset(&xas);
 			}
 		}
 
-		xas_store(&xas, page);
+		xas_store(&xas, folio);
 		if (xas_error(&xas))
 			goto unlock;
 
@@ -917,7 +915,7 @@ noinline int __add_to_page_cache_locked(struct page *page,
 
 		/* hugetlb pages do not participate in page cache accounting */
 		if (!huge)
-			__inc_lruvec_page_state(page, NR_FILE_PAGES);
+			__lruvec_stat_add_folio(folio, NR_FILE_PAGES);
 unlock:
 		xas_unlock_irq(&xas);
 	} while (xas_nomem(&xas, gfp));
@@ -925,19 +923,19 @@ noinline int __add_to_page_cache_locked(struct page *page,
 	if (xas_error(&xas)) {
 		error = xas_error(&xas);
 		if (charged)
-			mem_cgroup_uncharge(page);
+			folio_uncharge_cgroup(folio);
 		goto error;
 	}
 
-	trace_mm_filemap_add_to_page_cache(page);
+	trace_mm_filemap_add_to_page_cache(&folio->page);
 	return 0;
 error:
-	page->mapping = NULL;
+	folio->mapping = NULL;
 	/* Leave page->index set: truncation relies upon it */
-	put_page(page);
+	folio_put(folio);
 	return error;
 }
-ALLOW_ERROR_INJECTION(__add_to_page_cache_locked, ERRNO);
+ALLOW_ERROR_INJECTION(__filemap_add_folio, ERRNO);
 
 /**
  * add_to_page_cache_locked - add a locked page to the pagecache
@@ -954,39 +952,38 @@ ALLOW_ERROR_INJECTION(__add_to_page_cache_locked, ERRNO);
 int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
 		pgoff_t offset, gfp_t gfp_mask)
 {
-	return __add_to_page_cache_locked(page, mapping, offset,
+	return __filemap_add_folio(mapping, page_folio(page), offset,
 					  gfp_mask, NULL);
 }
 EXPORT_SYMBOL(add_to_page_cache_locked);
 
-int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
-				pgoff_t offset, gfp_t gfp_mask)
+int filemap_add_folio(struct address_space *mapping, struct folio *folio,
+				pgoff_t index, gfp_t gfp)
 {
 	void *shadow = NULL;
 	int ret;
 
-	__SetPageLocked(page);
-	ret = __add_to_page_cache_locked(page, mapping, offset,
-					 gfp_mask, &shadow);
+	__folio_set_locked_flag(folio);
+	ret = __filemap_add_folio(mapping, folio, index, gfp, &shadow);
 	if (unlikely(ret))
-		__ClearPageLocked(page);
+		__folio_clear_locked_flag(folio);
 	else {
 		/*
-		 * The page might have been evicted from cache only
+		 * The folio might have been evicted from cache only
 		 * recently, in which case it should be activated like
-		 * any other repeatedly accessed page.
-		 * The exception is pages getting rewritten; evicting other
+		 * any other repeatedly accessed folio.
+		 * The exception is folios getting rewritten; evicting other
 		 * data from the working set, only to cache data that will
 		 * get overwritten with something else, is a waste of memory.
 		 */
-		WARN_ON_ONCE(PageActive(page));
-		if (!(gfp_mask & __GFP_WRITE) && shadow)
-			workingset_refault(page_folio(page), shadow);
-		lru_cache_add(page);
+		WARN_ON_ONCE(folio_active(folio));
+		if (!(gfp & __GFP_WRITE) && shadow)
+			workingset_refault(folio, shadow);
+		folio_add_lru(folio);
 	}
 	return ret;
 }
-EXPORT_SYMBOL_GPL(add_to_page_cache_lru);
+EXPORT_SYMBOL_GPL(filemap_add_folio);
 
 #ifdef CONFIG_NUMA
 struct folio *filemap_alloc_folio(gfp_t gfp, unsigned int order)
-- 
2.30.2