drbd: Fixed bitmap in case of online-grow without resync

The "surplus" bits of the old (smaller) bitmap must be clean
in case of online-grow without resync.

Note: Reverted 67ae8b80d4a116ab3b7094eb3723506b20c06dff as
well, since the lines added by this patch are redundant. The
bits get set by the bm_set_surplus(b) call before that.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index aa7e23cf7e22..e3f88d6e1412 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -519,7 +519,7 @@ int drbd_bm_resize(struct drbd_conf *mdev, sector_t capacity, int set_new_bits)
         obits  = b->bm_bits;
 
         growing = bits > obits;
-        if (opages)
+        if (opages && growing && set_new_bits)
                 bm_set_surplus(b);
 
         b->bm_pages = npages;
@@ -532,9 +532,6 @@ int drbd_bm_resize(struct drbd_conf *mdev, sector_t capacity, int set_new_bits)
                 if (set_new_bits) {
                         bm_memset(b, owords, 0xff, words-owords);
                         b->bm_set += bits - obits;
-                        __bm_change_bits_to(mdev, obits,
-                                            ALIGN(obits, BITS_PER_LONG),
-                                            1, KM_IRQ1);
                 } else
                         bm_memset(b, owords, 0x00, words-owords);