Initial import

1 files changed, 72 insertions, 0 deletions

diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
new file mode 100644
index 000000000..b45d391b4
--- /dev/null
+++ b/include/linux/pagevec.h
@@ -0,0 +1,72 @@
+/*
+ * 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
+
+/* 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_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(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);
+}
+
+#endif /* _LINUX_PAGEVEC_H */