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-rw-r--r--include/linux/frontswap.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/frontswap.h b/include/linux/frontswap.h
index 011965c08b93..6d775984905b 100644
--- a/include/linux/frontswap.h
+++ b/include/linux/frontswap.h
@@ -7,6 +7,13 @@
#include <linux/bitops.h>
#include <linux/jump_label.h>
+/*
+ * Return code to denote that requested number of
+ * frontswap pages are unused(moved to page cache).
+ * Used in in shmem_unuse and try_to_unuse.
+ */
+#define FRONTSWAP_PAGES_UNUSED 2
+
struct frontswap_ops {
void (*init)(unsigned); /* this swap type was just swapon'ed */
int (*store)(unsigned, pgoff_t, struct page *); /* store a page */