1 files changed, 85 insertions, 0 deletions

diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
new file mode 100644
index 000000000000..def32c5715be
--- /dev/null
+++ b/include/linux/pagevec.h
@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+/* 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_release_nonlru(struct pagevec *pvec);
+void __pagevec_free(struct pagevec *pvec);
+void __pagevec_lru_add(struct pagevec *pvec);
+void __pagevec_lru_add_active(struct pagevec *pvec);
+void pagevec_strip(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);
+}
+
+static inline void pagevec_release_nonlru(struct pagevec *pvec)
+{
+        if (pagevec_count(pvec))
+                __pagevec_release_nonlru(pvec);
+}
+
+static inline void pagevec_free(struct pagevec *pvec)
+{
+        if (pagevec_count(pvec))
+                __pagevec_free(pvec);
+}
+
+static inline void pagevec_lru_add(struct pagevec *pvec)
+{
+        if (pagevec_count(pvec))
+                __pagevec_lru_add(pvec);
+}