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Add folio_get_private() which mirrors page_private() -- ie folio private data is the same as page private data. The only difference is that these return a void * instead of an unsigned long, which matches the majority of users. Turn attach_page_private() into folio_attach_private() and reimplement attach_page_private() as a wrapper. No filesystem which uses page private data currently supports compound pages, so we're free to define the rules. attach_page_private() may only be called on a head page; if you want to add private data to a tail page, you can call set_page_private() directly (and shouldn't increment the page refcount! That should be done when adding private data to the head page / folio). This saves 813 bytes of text with the distro-derived config that I'm testing due to removing the calls to compound_head() in get_page() & put_page(). Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Acked-by: Jeff Layton <[email protected]> Acked-by: Kirill A. Shutemov <[email protected]> Acked-by: Vlastimil Babka <[email protected]> Reviewed-by: William Kucharski <[email protected]> Reviewed-by: David Howells <[email protected]> Acked-by: Mike Rapoport <[email protected]>
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