1 files changed, 12 insertions, 0 deletions

diff --git a/mm/page_io.c b/mm/page_io.c
index dc76b4d0611e..651a91259317 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -18,6 +18,7 @@
 #include <linux/bio.h>
 #include <linux/swapops.h>
 #include <linux/writeback.h>
+#include <linux/frontswap.h>
 #include <asm/pgtable.h>
 
 static struct bio *get_swap_bio(gfp_t gfp_flags,
@@ -98,6 +99,12 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
                 unlock_page(page);
                 goto out;
         }
+        if (frontswap_put_page(page) == 0) {
+                set_page_writeback(page);
+                unlock_page(page);
+                end_page_writeback(page);
+                goto out;
+        }
         bio = get_swap_bio(GFP_NOIO, page, end_swap_bio_write);
         if (bio == NULL) {
                 set_page_dirty(page);
@@ -122,6 +129,11 @@ int swap_readpage(struct page *page)
 
         VM_BUG_ON(!PageLocked(page));
         VM_BUG_ON(PageUptodate(page));
+        if (frontswap_get_page(page) == 0) {
+                SetPageUptodate(page);
+                unlock_page(page);
+                goto out;
+        }
         bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
         if (bio == NULL) {
                 unlock_page(page);