[PATCH v13 014/137] mm/filemap: Add folio_next_index()

Matthew Wilcox (Oracle)
2021-07-12T03:16:15Z

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(+)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 8cc67ddb47d4..aac447fbaddd 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.
--
2.30.2