original development tree for Linux kernel GTP module; now long in mainline.
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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);
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);
}
#endif /* _LINUX_PAGEVEC_H */