2 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index a7409bc157e0..b92b73d0b2b9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -609,9 +609,12 @@ struct address_space_operations {
                         loff_t offset, unsigned long nr_segs);
         int (*get_xip_mem)(struct address_space *, pgoff_t, int,
                                                 void **, unsigned long *);
-        /* migrate the contents of a page to the specified target */
+        /*
+         * migrate the contents of a page to the specified target. If sync
+         * is false, it must not block.
+         */
         int (*migratepage) (struct address_space *,
-                        struct page *, struct page *);
+                        struct page *, struct page *, bool);
         int (*launder_page) (struct page *);
         int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
                                         unsigned long);
@@ -2537,7 +2540,7 @@ extern int generic_check_addressable(unsigned, u64);
 
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,
-                                struct page *, struct page *);
+                                struct page *, struct page *, bool);
 #else
 #define buffer_migrate_page NULL
 #endif
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index e39aeecfe9a2..14e6d2a88475 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -11,7 +11,7 @@ typedef struct page *new_page_t(struct page *, unsigned long private, int **);
 
 extern void putback_lru_pages(struct list_head *l);
 extern int migrate_page(struct address_space *,
-                        struct page *, struct page *);
+                        struct page *, struct page *, bool);
 extern int migrate_pages(struct list_head *l, new_page_t x,
                         unsigned long private, bool offlining,
                         bool sync);