2 files changed, 17 insertions, 45 deletions

diff --git a/mm/page_io.c b/mm/page_io.c
index d4840ecbf8f9..dbffec0d78c9 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -147,48 +147,3 @@ int swap_readpage(struct file *file, struct page *page)
 out:
         return ret;
 }
-
-#ifdef CONFIG_SOFTWARE_SUSPEND
-/*
- * A scruffy utility function to read or write an arbitrary swap page
- * and wait on the I/O.  The caller must have a ref on the page.
- *
- * 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,
-                        struct bio **bio_chain)
-{
-        struct bio *bio;
-        int ret = 0;
-        int bio_rw;
-
-        lock_page(page);
-
-        bio = get_swap_bio(GFP_KERNEL, entry.val, page, end_swap_bio_read);
-        if (bio == NULL) {
-                unlock_page(page);
-                ret = -ENOMEM;
-                goto out;
-        }
-
-        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;
-}
-#endif
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 2bfacbac0f4c..55242363de64 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -945,6 +945,23 @@ sector_t map_swap_page(struct swap_info_struct *sis, pgoff_t offset)
         }
 }
 
+#ifdef CONFIG_SOFTWARE_SUSPEND
+/*
+ * Get the (PAGE_SIZE) block corresponding to given offset on the swapdev
+ * corresponding to given index in swap_info (swap type).
+ */
+sector_t swapdev_block(int swap_type, pgoff_t offset)
+{
+        struct swap_info_struct *sis;
+
+        if (swap_type >= nr_swapfiles)
+                return 0;
+
+        sis = swap_info + swap_type;
+        return (sis->flags & SWP_WRITEOK) ? map_swap_page(sis, offset) : 0;
+}
+#endif /* CONFIG_SOFTWARE_SUSPEND */
+
 /*
  * Free all of a swapdev's extent information
  */