[PATCH v6 11/27] mm/filemap: Add folio_next_index
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2021-03-31 18:53:00
Also in:
linux-fsdevel, lkml
Subsystem:
page cache, the rest · Maintainers:
Matthew Wilcox, Jan Kara, Linus Torvalds
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@infradead.org> --- include/linux/pagemap.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 6749c47d3c33..3aefe6558f7d 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.
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2.30.2