linux-kernel - [PATCH v13 109/137] mm/filemap: Add filemap_remove_folio and __filemap_remove

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Date:   Mon, 12 Jul 2021 04:06:33 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH v13 109/137] mm/filemap: Add filemap_remove_folio and __filemap_remove_folio

Reimplement __delete_from_page_cache() as a wrapper around
__filemap_remove_folio() and delete_from_page_cache() as a wrapper
around filemap_remove_folio().  Remove the EXPORT_SYMBOL as
delete_from_page_cache() was not used by any in-tree modules.
Convert page_cache_free_page() into filemap_free_folio().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/pagemap.h |  9 +++++++--
 mm/filemap.c            | 44 ++++++++++++++++++++---------------------
 mm/folio-compat.c       |  5 +++++
 3 files changed, 33 insertions(+), 25 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 4be3b6242d6b..58d86679b92f 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -877,8 +877,13 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
 		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 filemap_remove_folio(struct folio *folio);
+void delete_from_page_cache(struct page *page);
+void __filemap_remove_folio(struct folio *folio, void *shadow);
+static inline void __delete_from_page_cache(struct page *page, void *shadow)
+{
+	__filemap_remove_folio(page_folio(page), shadow);
+}
 void replace_page_cache_page(struct page *old, struct page *new);
 void delete_from_page_cache_batch(struct address_space *mapping,
 				  struct pagevec *pvec);
diff --git a/mm/filemap.c b/mm/filemap.c
index bede1d754769..a24e26563e9f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -219,55 +219,53 @@ static void filemap_unaccount_folio(struct address_space *mapping,
  * sure the page is locked and that nobody else uses it - or that usage
  * is safe.  The caller must hold the i_pages lock.
  */
-void __delete_from_page_cache(struct page *page, void *shadow)
+void __filemap_remove_folio(struct folio *folio, void *shadow)
 {
-	struct folio *folio = page_folio(page);
-	struct address_space *mapping = page->mapping;
+	struct address_space *mapping = folio->mapping;
 
-	trace_mm_filemap_delete_from_page_cache(page);
+	trace_mm_filemap_delete_from_page_cache(&folio->page);
 
 	filemap_unaccount_folio(mapping, folio);
 	page_cache_delete(mapping, folio, shadow);
 }
 
-static void page_cache_free_page(struct address_space *mapping,
-				struct page *page)
+static void filemap_free_folio(struct address_space *mapping,
+				struct folio *folio)
 {
 	void (*freepage)(struct page *);
 
 	freepage = mapping->a_ops->freepage;
 	if (freepage)
-		freepage(page);
+		freepage(&folio->page);
 
-	if (PageTransHuge(page) && !PageHuge(page)) {
-		page_ref_sub(page, thp_nr_pages(page));
-		VM_BUG_ON_PAGE(page_count(page) <= 0, page);
+	if (folio_multi(folio) && !folio_hugetlb(folio)) {
+		folio_ref_sub(folio, folio_nr_pages(folio));
+		VM_BUG_ON_FOLIO(folio_ref_count(folio) <= 0, folio);
 	} else {
-		put_page(page);
+		folio_put(folio);
 	}
 }
 
 /**
- * delete_from_page_cache - delete page from page cache
- * @page: the page which the kernel is trying to remove from page cache
+ * filemap_remove_folio - Remove folio from page cache.
+ * @folio: The folio.
  *
- * This must be called only on pages that have been verified to be in the page
- * cache and locked.  It will never put the page into the free list, the caller
- * has a reference on the page.
+ * This must be called only on folios that are locked and have been
+ * verified to be in the page cache.  It will never put the folio into
+ * the free list because the caller has a reference on the page.
  */
-void delete_from_page_cache(struct page *page)
+void filemap_remove_folio(struct folio *folio)
 {
-	struct address_space *mapping = page_mapping(page);
+	struct address_space *mapping = folio->mapping;
 	unsigned long flags;
 
-	BUG_ON(!PageLocked(page));
+	BUG_ON(!folio_locked(folio));
 	xa_lock_irqsave(&mapping->i_pages, flags);
-	__delete_from_page_cache(page, NULL);
+	__filemap_remove_folio(folio, NULL);
 	xa_unlock_irqrestore(&mapping->i_pages, flags);
 
-	page_cache_free_page(mapping, page);
+	filemap_free_folio(mapping, folio);
 }
-EXPORT_SYMBOL(delete_from_page_cache);
 
 /*
  * page_cache_delete_batch - delete several pages from page cache
@@ -350,7 +348,7 @@ void delete_from_page_cache_batch(struct address_space *mapping,
 	xa_unlock_irqrestore(&mapping->i_pages, flags);
 
 	for (i = 0; i < pagevec_count(pvec); i++)
-		page_cache_free_page(mapping, pvec->pages[i]);
+		filemap_free_folio(mapping, page_folio(pvec->pages[i]));
 }
 
 int filemap_check_errors(struct address_space *mapping)
diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index 5b6ae1da314e..749a695b4217 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -140,3 +140,8 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
 			mapping_gfp_mask(mapping));
 }
 EXPORT_SYMBOL(grab_cache_page_write_begin);
+
+void delete_from_page_cache(struct page *page)
+{
+	return filemap_remove_folio(page_folio(page));
+}
-- 
2.30.2