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788540141f
Make it possible to include linux/pagevec.h multiple times without incurring errors due to duplicate definitions. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
90 lines
2 KiB
C
90 lines
2 KiB
C
/*
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* include/linux/pagevec.h
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*
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* In many places it is efficient to batch an operation up against multiple
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* pages. A pagevec is a multipage container which is used for that.
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*/
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#ifndef _LINUX_PAGEVEC_H
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#define _LINUX_PAGEVEC_H
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/* 14 pointers + two long's align the pagevec structure to a power of two */
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#define PAGEVEC_SIZE 14
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struct page;
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struct address_space;
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struct pagevec {
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unsigned long nr;
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unsigned long cold;
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struct page *pages[PAGEVEC_SIZE];
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};
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void __pagevec_release(struct pagevec *pvec);
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void __pagevec_release_nonlru(struct pagevec *pvec);
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void __pagevec_free(struct pagevec *pvec);
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void __pagevec_lru_add(struct pagevec *pvec);
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void __pagevec_lru_add_active(struct pagevec *pvec);
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void pagevec_strip(struct pagevec *pvec);
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unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
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pgoff_t start, unsigned nr_pages);
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unsigned pagevec_lookup_tag(struct pagevec *pvec,
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struct address_space *mapping, pgoff_t *index, int tag,
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unsigned nr_pages);
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static inline void pagevec_init(struct pagevec *pvec, int cold)
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{
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pvec->nr = 0;
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pvec->cold = cold;
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}
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static inline void pagevec_reinit(struct pagevec *pvec)
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{
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pvec->nr = 0;
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}
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static inline unsigned pagevec_count(struct pagevec *pvec)
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{
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return pvec->nr;
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}
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static inline unsigned pagevec_space(struct pagevec *pvec)
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{
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return PAGEVEC_SIZE - pvec->nr;
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}
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/*
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* Add a page to a pagevec. Returns the number of slots still available.
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*/
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static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
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{
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pvec->pages[pvec->nr++] = page;
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return pagevec_space(pvec);
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}
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static inline void pagevec_release(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_release(pvec);
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}
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static inline void pagevec_release_nonlru(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_release_nonlru(pvec);
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}
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static inline void pagevec_free(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_free(pvec);
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}
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static inline void pagevec_lru_add(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_lru_add(pvec);
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}
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#endif /* _LINUX_PAGEVEC_H */
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