1 files changed, 19 insertions, 6 deletions

diff --git a/mm/page_io.c b/mm/page_io.c
index d2f0a5783370..f46a9862b7ef 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -156,10 +156,12 @@ out:
  * We use end_swap_bio_read() even for writes, because it happens to do what
  * we want.
  */
-int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page)
+int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page,
+                        struct bio **bio_chain)
 {
         struct bio *bio;
         int ret = 0;
+        int bio_rw;
 
         lock_page(page);
 
@@ -170,11 +172,22 @@ int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page)
                 goto out;
         }
 
-        submit_bio(rw | (1 << BIO_RW_SYNC), bio);
-        wait_on_page_locked(page);
-
-        if (!PageUptodate(page) || PageError(page))
-                ret = -EIO;
+        bio_rw = rw;
+        if (!bio_chain)
+                bio_rw |= (1 << BIO_RW_SYNC);
+        if (bio_chain)
+                bio_get(bio);
+        submit_bio(bio_rw, bio);
+        if (bio_chain == NULL) {
+                wait_on_page_locked(page);
+
+                if (!PageUptodate(page) || PageError(page))
+                        ret = -EIO;
+        }
+        if (bio_chain) {
+                bio->bi_private = *bio_chain;
+                *bio_chain = bio;
+        }
 out:
         return ret;
 }