pagevec.h
上传用户:szlgq88
上传日期:2009-04-28
资源大小:48287k
文件大小:2k
- /*
- * 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.
- */
- /* 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);
- }