[PATCH v13 15/32] mm/filemap: Add folio_pos() and folio_file_pos()
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STALE1914d
REVIEWED: 19 (16M)
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2021-07-12 19:11:21
Also in:
linux-fsdevel, lkml
Subsystem:
page cache, the rest · Maintainers:
Matthew Wilcox, Jan Kara, Linus Torvalds
Revision v1 of 12 in this series; 6 review trailers.
Revisions (12)
These are just wrappers around page_offset() and page_file_offset() respectively. No change 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 <redacted> Acked-by: Vlastimil Babka <redacted> Reviewed-by: William Kucharski <redacted> Reviewed-by: David Howells <dhowells@redhat.com> --- include/linux/pagemap.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index aac447fbaddd..89bfc92714bf 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h@@ -562,6 +562,27 @@ static inline loff_t page_file_offset(struct page *page) return ((loff_t)page_index(page)) << PAGE_SHIFT; } +/** + * folio_pos - Returns the byte position of this folio in its file. + * @folio: The folio. + */ +static inline loff_t folio_pos(struct folio *folio) +{ + return page_offset(&folio->page); +} + +/** + * folio_file_pos - Returns the byte position of this folio in its file. + * @folio: The folio. + * + * This differs from folio_pos() for folios which belong to a swap file. + * NFS is the only filesystem today which needs to use folio_file_pos(). + */ +static inline loff_t folio_file_pos(struct folio *folio) +{ + return page_file_offset(&folio->page); +} + extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma, unsigned long address);
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2.30.2