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/* * include/linux/pagevec.h * * In many places it is efficient to batch an operation up against multiple * pages. A pagevec is a multipage container which is used for that. */ #ifndef _LINUX_PAGEVEC_H #define _LINUX_PAGEVEC_H /* 14 pointers + two long's align the pagevec structure to a power of two */ #define PAGEVEC_SIZE 14 struct page; struct address_space; struct pagevec { unsigned long nr; unsigned long cold; struct page *pages[PAGEVEC_SIZE]; }; void __pagevec_release(struct pagevec *pvec); void __pagevec_release_nonlru(struct pagevec *pvec); void __pagevec_free(struct pagevec *pvec); void __pagevec_lru_add(struct pagevec *pvec); void __pagevec_lru_add_active(struct pagevec *pvec); void pagevec_strip(struct pagevec *pvec); unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, pgoff_t start, unsigned nr_pages); unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping, pgoff_t *index, int tag, unsigned nr_pages); static inline void pagevec_init(struct pagevec *pvec, int cold) { pvec->nr = 0; pvec->cold = cold; } static inline void pagevec_reinit(struct pagevec *pvec) { pvec->nr = 0; } static inline unsigned pagevec_count(struct pagevec *pvec) { return pvec->nr; } static inline unsigned pagevec_space(struct pagevec *pvec) { return PAGEVEC_SIZE - pvec->nr; } /* * Add a page to a pagevec. Returns the number of slots still available. */ static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) { pvec->pages[pvec->nr++] = page; return pagevec_space(pvec); } static inline void pagevec_release(struct pagevec *pvec) { if (pagevec_count(pvec)) __pagevec_release(pvec); } static inline void pagevec_release_nonlru(struct pagevec *pvec) { if (pagevec_count(pvec)) __pagevec_release_nonlru(pvec); } static inline void pagevec_free(struct pagevec *pvec) { if (pagevec_count(pvec)) __pagevec_free(pvec); } static inline void pagevec_lru_add(struct pagevec *pvec) { if (pagevec_count(pvec)) __pagevec_lru_add(pvec); } #endif /* _LINUX_PAGEVEC_H */