92 строки
2.3 KiB
C
92 строки
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* 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
|
|
|
|
#include <linux/xarray.h>
|
|
|
|
/* 15 pointers + header align the pagevec structure to a power of two */
|
|
#define PAGEVEC_SIZE 15
|
|
|
|
struct page;
|
|
struct address_space;
|
|
|
|
struct pagevec {
|
|
unsigned char nr;
|
|
bool percpu_pvec_drained;
|
|
struct page *pages[PAGEVEC_SIZE];
|
|
};
|
|
|
|
void __pagevec_release(struct pagevec *pvec);
|
|
void __pagevec_lru_add(struct pagevec *pvec);
|
|
unsigned pagevec_lookup_entries(struct pagevec *pvec,
|
|
struct address_space *mapping,
|
|
pgoff_t start, unsigned nr_entries,
|
|
pgoff_t *indices);
|
|
void pagevec_remove_exceptionals(struct pagevec *pvec);
|
|
unsigned pagevec_lookup_range(struct pagevec *pvec,
|
|
struct address_space *mapping,
|
|
pgoff_t *start, pgoff_t end);
|
|
static inline unsigned pagevec_lookup(struct pagevec *pvec,
|
|
struct address_space *mapping,
|
|
pgoff_t *start)
|
|
{
|
|
return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1);
|
|
}
|
|
|
|
unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
|
|
struct address_space *mapping, pgoff_t *index, pgoff_t end,
|
|
xa_mark_t tag);
|
|
unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec,
|
|
struct address_space *mapping, pgoff_t *index, pgoff_t end,
|
|
xa_mark_t tag, unsigned max_pages);
|
|
static inline unsigned pagevec_lookup_tag(struct pagevec *pvec,
|
|
struct address_space *mapping, pgoff_t *index, xa_mark_t tag)
|
|
{
|
|
return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag);
|
|
}
|
|
|
|
static inline void pagevec_init(struct pagevec *pvec)
|
|
{
|
|
pvec->nr = 0;
|
|
pvec->percpu_pvec_drained = false;
|
|
}
|
|
|
|
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 */
|