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[v12,14/33] mm/filemap: Add folio_next_index()

Message ID 20210622114118.3388190-15-willy@infradead.org (mailing list archive)
State New
Headers show
Series Memory folios | expand

Commit Message

Matthew Wilcox June 22, 2021, 11:40 a.m. UTC
This helper returns the page index of the next folio in the file (ie
the end of this folio, plus one).

No changes to generated code.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: David Howells <dhowells@redhat.com>
 include/linux/pagemap.h | 11 +++++++++++
 1 file changed, 11 insertions(+)
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diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 3af2bcd13a9b..4b3ce5f76a7b 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -406,6 +406,17 @@  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.