1 files changed, 24 insertions, 0 deletions

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 08316972ff93..7bbf420d1289 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -52,6 +52,7 @@
 #include "ubifs.h"
 #include <linux/mount.h>
 #include <linux/slab.h>
+#include <linux/migrate.h>
 
 static int read_block(struct inode *inode, void *addr, unsigned int block,
                       struct ubifs_data_node *dn)
@@ -1452,6 +1453,26 @@ static int ubifs_set_page_dirty(struct page *page)
         return ret;
 }
 
+#ifdef CONFIG_MIGRATION
+static int ubifs_migrate_page(struct address_space *mapping,
+                struct page *newpage, struct page *page, enum migrate_mode mode)
+{
+        int rc;
+
+        rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0);
+        if (rc != MIGRATEPAGE_SUCCESS)
+                return rc;
+
+        if (PagePrivate(page)) {
+                ClearPagePrivate(page);
+                SetPagePrivate(newpage);
+        }
+
+        migrate_page_copy(newpage, page);
+        return MIGRATEPAGE_SUCCESS;
+}
+#endif
+
 static int ubifs_releasepage(struct page *page, gfp_t unused_gfp_flags)
 {
         /*
@@ -1591,6 +1612,9 @@ const struct address_space_operations ubifs_file_address_operations = {
         .write_end      = ubifs_write_end,
         .invalidatepage = ubifs_invalidatepage,
         .set_page_dirty = ubifs_set_page_dirty,
+#ifdef CONFIG_MIGRATION
+        .migratepage    = ubifs_migrate_page,
+#endif
         .releasepage    = ubifs_releasepage,
 };