linux-kernel - [PATCH v7 12/28] mm/filemap: Add folio_next

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Message-Id: <20210409185105.188284-13-willy@infradead.org>
Date:   Fri,  9 Apr 2021 19:50:49 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        Christoph Hellwig <hch@....de>,
        Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v7 12/28] mm/filemap: Add folio_next_index

This helper returns the page index of the next folio in the file (ie
the end of this folio, plus one).

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Acked-by: Jeff Layton <jlayton@...nel.org>
---
 include/linux/pagemap.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a8b108a9ac6e..5130503519b0 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -482,6 +482,17 @@ static inline pgoff_t folio_index(struct folio *folio)
         return folio->index;
 }
 
+/**
+ * folio_next_index - Get the index of the next folio.
+ * @folio: The current folio.
+ *
+ * Return: The index of the folio which follows this folio in the file.
+ */
+static inline pgoff_t folio_next_index(struct folio *folio)
+{
+	return folio->index + folio_nr_pages(folio);
+}
+
 /**
  * folio_file_page - The page for a particular index.
  * @folio: The folio which contains this index.
-- 
2.30.2