linux-kernel - [PATCH v2 34/46] mm/filemap: Add i_blocks_per

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Message-Id: <20210622121551.3398730-35-willy@infradead.org>
Date:   Tue, 22 Jun 2021 13:15:39 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     akpm@...ux-foundation.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 34/46] mm/filemap: Add i_blocks_per_folio()

Reimplement i_blocks_per_page() as a wrapper around i_blocks_per_folio().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/pagemap.h | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 31edfa891987..c30db827b65d 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -1149,19 +1149,25 @@ static inline int page_mkwrite_check_truncate(struct page *page,
 }
 
 /**
- * i_blocks_per_page - How many blocks fit in this page.
+ * i_blocks_per_folio - How many blocks fit in this folio.
  * @inode: The inode which contains the blocks.
- * @page: The page (head page if the page is a THP).
+ * @folio: The folio.
  *
- * If the block size is larger than the size of this page, return zero.
+ * If the block size is larger than the size of this folio, return zero.
  *
- * Context: The caller should hold a refcount on the page to prevent it
+ * Context: The caller should hold a refcount on the folio to prevent it
  * from being split.
- * Return: The number of filesystem blocks covered by this page.
+ * Return: The number of filesystem blocks covered by this folio.
  */
+static inline
+unsigned int i_blocks_per_folio(struct inode *inode, struct folio *folio)
+{
+	return folio_size(folio) >> inode->i_blkbits;
+}
+
 static inline
 unsigned int i_blocks_per_page(struct inode *inode, struct page *page)
 {
-	return thp_size(page) >> inode->i_blkbits;
+	return i_blocks_per_folio(inode, page_folio(page));
 }
 #endif /* _LINUX_PAGEMAP_H */
-- 
2.30.2