pagevec.h

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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_lru_add(struct pagevec *pvec, enum lru_list lru);
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_lru_add_anon(struct pagevec *pvec)
{
    __pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
}

static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
{
    __pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
}

static inline void __pagevec_lru_add_file(struct pagevec *pvec)
{
    __pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
}

static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
{
    __pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
}

static inline void pagevec_lru_add_file(struct pagevec *pvec)
{
    if (pagevec_count(pvec))
        __pagevec_lru_add_file(pvec);
}

static inline void pagevec_lru_add_anon(struct pagevec *pvec)
{
    if (pagevec_count(pvec))
        __pagevec_lru_add_anon(pvec);
}

#endif /* _LINUX_PAGEVEC_H */