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pagevec: Add folio_batch
The folio_batch is the same as the pagevec, except that it is typed to contain folios and not pages. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
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@ -15,8 +15,10 @@
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#define PAGEVEC_SIZE 15
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struct page;
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struct folio;
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struct address_space;
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/* Layout must match folio_batch */
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struct pagevec {
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unsigned char nr;
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bool percpu_pvec_drained;
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@ -81,4 +83,71 @@ static inline void pagevec_release(struct pagevec *pvec)
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__pagevec_release(pvec);
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}
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/**
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* struct folio_batch - A collection of folios.
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*
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* The folio_batch is used to amortise the cost of retrieving and
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* operating on a set of folios. The order of folios in the batch may be
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* significant (eg delete_from_page_cache_batch()). Some users of the
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* folio_batch store "exceptional" entries in it which can be removed
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* by calling folio_batch_remove_exceptionals().
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*/
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struct folio_batch {
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unsigned char nr;
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bool percpu_pvec_drained;
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struct folio *folios[PAGEVEC_SIZE];
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};
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/* Layout must match pagevec */
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static_assert(sizeof(struct pagevec) == sizeof(struct folio_batch));
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static_assert(offsetof(struct pagevec, pages) ==
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offsetof(struct folio_batch, folios));
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/**
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* folio_batch_init() - Initialise a batch of folios
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* @fbatch: The folio batch.
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*
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* A freshly initialised folio_batch contains zero folios.
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*/
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static inline void folio_batch_init(struct folio_batch *fbatch)
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{
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fbatch->nr = 0;
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}
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static inline unsigned int folio_batch_count(struct folio_batch *fbatch)
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{
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return fbatch->nr;
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}
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static inline unsigned int fbatch_space(struct folio_batch *fbatch)
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{
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return PAGEVEC_SIZE - fbatch->nr;
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}
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/**
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* folio_batch_add() - Add a folio to a batch.
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* @fbatch: The folio batch.
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* @folio: The folio to add.
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*
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* The folio is added to the end of the batch.
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* The batch must have previously been initialised using folio_batch_init().
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*
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* Return: The number of slots still available.
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*/
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static inline unsigned folio_batch_add(struct folio_batch *fbatch,
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struct folio *folio)
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{
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fbatch->folios[fbatch->nr++] = folio;
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return fbatch_space(fbatch);
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}
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static inline void folio_batch_release(struct folio_batch *fbatch)
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{
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pagevec_release((struct pagevec *)fbatch);
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}
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static inline void folio_batch_remove_exceptionals(struct folio_batch *fbatch)
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{
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pagevec_remove_exceptionals((struct pagevec *)fbatch);
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}
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#endif /* _LINUX_PAGEVEC_H */
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