1 files changed, 76 insertions, 0 deletions
diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
new file mode 100644
index 000000000000..7d091aea7543
--- /dev/null
+++ b/include/linux/pagevec.h
@@ -0,0 +1,76 @@
+/*
+ * 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.
+ */
+
+#define PAGEVEC_SIZE	16
+
+struct page;
+
+struct pagevec {
+	unsigned nr;
+	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_del(struct pagevec *pvec);
+void pagevec_deactivate_inactive(struct pagevec *pvec);
+
+static inline void pagevec_init(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);
+}
+
+static inline void pagevec_lru_del(struct pagevec *pvec)
+{
+	if (pagevec_count(pvec))
+		__pagevec_lru_del(pvec);
+}