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1 /* SPDX-License-Identifier: GPL-2.0 */
3 * include/linux/pagevec.h
5 * In many places it is efficient to batch an operation up against multiple
6 * pages. A pagevec is a multipage container which is used for that.
9 #ifndef _LINUX_PAGEVEC_H
10 #define _LINUX_PAGEVEC_H
12 #include <linux/xarray.h>
14 /* 15 pointers + header align the pagevec structure to a power of two */
15 #define PAGEVEC_SIZE 15
22 bool percpu_pvec_drained
;
23 struct page
*pages
[PAGEVEC_SIZE
];
26 void __pagevec_release(struct pagevec
*pvec
);
27 void __pagevec_lru_add(struct pagevec
*pvec
);
28 void pagevec_remove_exceptionals(struct pagevec
*pvec
);
29 unsigned pagevec_lookup_range(struct pagevec
*pvec
,
30 struct address_space
*mapping
,
31 pgoff_t
*start
, pgoff_t end
);
32 static inline unsigned pagevec_lookup(struct pagevec
*pvec
,
33 struct address_space
*mapping
,
36 return pagevec_lookup_range(pvec
, mapping
, start
, (pgoff_t
)-1);
39 unsigned pagevec_lookup_range_tag(struct pagevec
*pvec
,
40 struct address_space
*mapping
, pgoff_t
*index
, pgoff_t end
,
42 static inline unsigned pagevec_lookup_tag(struct pagevec
*pvec
,
43 struct address_space
*mapping
, pgoff_t
*index
, xa_mark_t tag
)
45 return pagevec_lookup_range_tag(pvec
, mapping
, index
, (pgoff_t
)-1, tag
);
48 static inline void pagevec_init(struct pagevec
*pvec
)
51 pvec
->percpu_pvec_drained
= false;
54 static inline void pagevec_reinit(struct pagevec
*pvec
)
59 static inline unsigned pagevec_count(struct pagevec
*pvec
)
64 static inline unsigned pagevec_space(struct pagevec
*pvec
)
66 return PAGEVEC_SIZE
- pvec
->nr
;
70 * Add a page to a pagevec. Returns the number of slots still available.
72 static inline unsigned pagevec_add(struct pagevec
*pvec
, struct page
*page
)
74 pvec
->pages
[pvec
->nr
++] = page
;
75 return pagevec_space(pvec
);
78 static inline void pagevec_release(struct pagevec
*pvec
)
80 if (pagevec_count(pvec
))
81 __pagevec_release(pvec
);
84 #endif /* _LINUX_PAGEVEC_H */