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mm: Add folio_pgoff()

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This is the folio equivalent of page_to_pgoff().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-02-02 23:29:45 -05:00
parent 346cf61311
commit f087b903fc
1 changed files with 11 additions and 0 deletions
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11
include/linux/pagemap.h
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@ -817,6 +817,17 @@ static inline loff_t folio_file_pos(struct folio *folio)
return page_file_offset(&folio->page);
}
/*
* Get the offset in PAGE_SIZE (even for hugetlb folios).
* (TODO: hugetlb folios should have ->index in PAGE_SIZE)
*/
static inline pgoff_t folio_pgoff(struct folio *folio)
{
if (unlikely(folio_test_hugetlb(folio)))
return hugetlb_basepage_index(&folio->page);
return folio->index;
}
extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
unsigned long address);