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    Subject[PATCH v14 015/138] mm/filemap: Add folio_pos() and folio_file_pos()
    Date
    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 <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 | 21 +++++++++++++++++++++
    1 file changed, 21 insertions(+)

    diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
    index bd0e7e91bfd4..aa71fa82d6be 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);

    --
    2.30.2
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