| /* 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); |
| 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); |
| 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 */ |