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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /include/linux/pagevec.h
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'include/linux/pagevec.h')
-rw-r--r--include/linux/pagevec.h99
1 files changed, 99 insertions, 0 deletions
diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
new file mode 100644
index 00000000..2aa12b84
--- /dev/null
+++ b/include/linux/pagevec.h
@@ -0,0 +1,99 @@
+/*
+ * 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, enum lru_list lru);
+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_lru_add_anon(struct pagevec *pvec)
+{
+ __pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
+}
+
+static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
+{
+ __pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
+}
+
+static inline void __pagevec_lru_add_file(struct pagevec *pvec)
+{
+ __pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
+}
+
+static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
+{
+ __pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
+}
+
+static inline void pagevec_lru_add_file(struct pagevec *pvec)
+{
+ if (pagevec_count(pvec))
+ __pagevec_lru_add_file(pvec);
+}
+
+static inline void pagevec_lru_add_anon(struct pagevec *pvec)
+{
+ if (pagevec_count(pvec))
+ __pagevec_lru_add_anon(pvec);
+}
+
+#endif /* _LINUX_PAGEVEC_H */