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mm/filemap: Add folio_pos() and folio_file_pos()

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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>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-12-24 07:25:19 -05:00
parent f94b18f665
commit 352b47a698
1 changed files with 21 additions and 0 deletions
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21
include/linux/pagemap.h
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@ -561,6 +561,27 @@ 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);