3 files changed, 18 insertions, 3 deletions

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 33626e34c92a..4a076b2553e6 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -922,6 +922,7 @@ struct bm_aio_ctx {
         unsigned flags;
 #define BM_AIO_COPY_PAGES       1
 #define BM_AIO_WRITE_HINTED     2
+#define BM_WRITE_ALL_PAGES      4
         int error;
         struct kref kref;
 };
@@ -1096,7 +1097,9 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w
                             !test_and_clear_bit(BM_PAGE_HINT_WRITEOUT,
                                     &page_private(b->bm_pages[i])))
                                 continue;
-                        if (bm_test_page_unchanged(b->bm_pages[i])) {
+
+                        if (!(flags & BM_WRITE_ALL_PAGES) &&
+                            bm_test_page_unchanged(b->bm_pages[i])) {
                                 dynamic_dev_dbg(DEV, "skipped bm write for idx %u\n", i);
                                 continue;
                         }
@@ -1181,6 +1184,17 @@ int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local)
 }
 
 /**
+ * drbd_bm_write_all() - Write the whole bitmap to its on disk location.
+ * @mdev:       DRBD device.
+ *
+ * Will write all pages.
+ */
+int drbd_bm_write_all(struct drbd_conf *mdev) __must_hold(local)
+{
+        return bm_rw(mdev, WRITE, BM_WRITE_ALL_PAGES, 0);
+}
+
+/**
  * drbd_bm_lazy_write_out() - Write bitmap pages 0 to @upper_idx-1, if they have changed.
  * @mdev:       DRBD device.
  * @upper_idx:  0: write all changed pages; +ve: page index to stop scanning for changed pages
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 813f50dbe5ca..d8b3c88d6f1c 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1329,6 +1329,7 @@ extern int  drbd_bm_read(struct drbd_conf *mdev) __must_hold(local);
 extern void drbd_bm_mark_for_writeout(struct drbd_conf *mdev, int page_nr);
 extern int  drbd_bm_write(struct drbd_conf *mdev) __must_hold(local);
 extern int  drbd_bm_write_hinted(struct drbd_conf *mdev) __must_hold(local);
+extern int drbd_bm_write_all(struct drbd_conf *mdev) __must_hold(local);
 extern int  drbd_bm_write_copy_pages(struct drbd_conf *mdev) __must_hold(local);
 extern size_t        drbd_bm_words(struct drbd_conf *mdev);
 extern unsigned long drbd_bm_bits(struct drbd_conf *mdev);
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index d1073705bf1f..c02d5265c397 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -894,8 +894,8 @@ enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds
                          la_size_changed && md_moved ? "size changed and md moved" :
                          la_size_changed ? "size changed" : "md moved");
                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
-                err = drbd_bitmap_io(mdev, &drbd_bm_write,
-                                "size changed", BM_LOCKED_MASK);
+                err = drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
+                                     "size changed", BM_LOCKED_MASK);
                 if (err) {
                         rv = dev_size_error;
                         goto out;