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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.
 */

#define PAGEVEC_SIZE    16

struct page;
struct address_space;

struct pagevec {
        unsigned nr;
        int 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 int pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
                pgoff_t start, unsigned int 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);
}