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mm/filemap: Add folio_next_index()

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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>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-03-21 16:24:31 -04:00
parent 9257e15677
commit f94b18f665
1 changed files with 11 additions and 0 deletions
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11
include/linux/pagemap.h
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@ -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.